Separation and Purification Technology最新文献_第3页

Hierarchically engineered mutifunctional and robust oil-water separation membranes with integrated dye adsorption and microplastic separation 分层设计多功能和坚固的油水分离膜集成染料吸附和微塑料分离

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-10 DOI: 10.1016/j.seppur.2026.137215

Anqi Dou , Liangyu Wu , Yixuan Liu , Yushu Sui , Ruiyang Chen , Yanyu Zhu , Ning Cao , Xiaorui Guo , Zhonghua Tang , Jinhui Pang

Contamination by emulsified wastewater represents a significant global environmental challenge, compounded by the difficulties associated with treating dyes and microplastic pollutants. Although considerable efforts have been devoted to developing high-performance membranes for emulsion separation, their practical application was limited by poor stability and single functionality. Herein, inspired by fish scales, the robust micro/nano-hierarchical exceptional hydrophilic layer were developed on Eucommia ulmoides gum (EUG) nanofiber substrate for multifunctional oil-in-water emulsion separation. The hydrophilic layer was fabricated through the Schiff base reaction between ellagic acid (EA) and bovine serum albumin (BSA). By employing a cooperative strategy that combines the above hydrophilic network with the in-situ growth of CaCO₃ micro/nanoparticles, endowed the BE@CaCO₃/EUG-6 composite membranes with remarkable wettability. The as-prepared BE@CaCO₃/EUG-6 with unique bioinspired fish scales structure exhibited high separation flux (2627.4 L·m⁻²·h⁻¹ for n-hexane-in-water emulsion) and efficiency (97% for n-hexane-in-water emulsion), along with excellent dye adsorption capacity, and remarkable microplastic separation performance (4120 L·m⁻²·h⁻¹, 99.7%). Most important, the BE@CaCO₃/EUG-6 nanofiber membranes showed outstanding stability under harsh chemical environment, even after 30 days of exposure to acids, alkalis, and salts, the structure and performance remained unchanged. This study presents an innovative strategy for fabricating robust multifunctional with highly effective water treatment.

乳化废水污染是一项重大的全球环境挑战，再加上处理染料和微塑料污染物的困难。尽管人们在开发高性能乳液分离膜方面付出了巨大的努力，但由于其稳定性差和功能单一，限制了其实际应用。本文以鱼鳞为灵感，在杜仲胶（EUG）纳米纤维基底上开发了一种坚固的微纳米级特殊亲水性层，用于多功能油水乳液分离。通过鞣花酸（EA）与牛血清白蛋白（BSA）的希夫碱反应制备亲水性层。通过将上述亲水性网络与CaCO3微/纳米颗粒原位生长相结合的协同策略，使BE@CaCO3/EUG-6复合膜具有显著的润湿性。所制备的BE@CaCO3/EUG-6具有独特的仿生鱼鳞结构，具有较高的分离通量（2627.4 L·m−2·h−1）和效率（97%），具有良好的染料吸附能力，微塑料分离性能（4120 L·m−2·h−1,99.7%）。最重要的是，BE@CaCO3/EUG-6纳米纤维膜在恶劣的化学环境下表现出出色的稳定性，即使在酸、碱、盐等环境下暴露30天后，其结构和性能仍保持不变。本研究提出了一种创新的策略，用于制造强大的多功能高效水处理。

{"title":"Hierarchically engineered mutifunctional and robust oil-water separation membranes with integrated dye adsorption and microplastic separation","authors":"Anqi Dou , Liangyu Wu , Yixuan Liu , Yushu Sui , Ruiyang Chen , Yanyu Zhu , Ning Cao , Xiaorui Guo , Zhonghua Tang , Jinhui Pang","doi":"10.1016/j.seppur.2026.137215","DOIUrl":"10.1016/j.seppur.2026.137215","url":null,"abstract":"<div><div>Contamination by emulsified wastewater represents a significant global environmental challenge, compounded by the difficulties associated with treating dyes and microplastic pollutants. Although considerable efforts have been devoted to developing high-performance membranes for emulsion separation, their practical application was limited by poor stability and single functionality. Herein, inspired by fish scales, the robust micro/nano-hierarchical exceptional hydrophilic layer were developed on <em>Eucommia ulmoides</em> gum (EUG) nanofiber substrate for multifunctional oil-in-water emulsion separation. The hydrophilic layer was fabricated through the Schiff base reaction between ellagic acid (EA) and bovine serum albumin (BSA). By employing a cooperative strategy that combines the above hydrophilic network with the in-situ growth of CaCO<sub>3</sub> micro/nanoparticles, endowed the BE@CaCO<sub>3</sub>/EUG-6 composite membranes with remarkable wettability. The as-prepared BE@CaCO<sub>3</sub>/EUG-6 with unique bioinspired fish scales structure exhibited high separation flux (2627.4 L·m<sup>−2</sup>·h<sup>−1</sup> for n-hexane-in-water emulsion) and efficiency (97% for n-hexane-in-water emulsion), along with excellent dye adsorption capacity, and remarkable microplastic separation performance (4120 L·m<sup>−2</sup>·h<sup>−1</sup>, 99.7%). Most important, the BE@CaCO<sub>3</sub>/EUG-6 nanofiber membranes showed outstanding stability under harsh chemical environment, even after 30 days of exposure to acids, alkalis, and salts, the structure and performance remained unchanged. This study presents an innovative strategy for fabricating robust multifunctional with highly effective water treatment.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137215"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146153028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancing high-purity CO2 capture from wet flue gas using air-purge-enhanced low-grade-heat TSA with carbon-based adsorbents: Carbon molecular sieves outperform activated carbon 利用带有碳基吸附剂的空气净化增强型低热TSA推进从湿式烟气中捕获高纯度二氧化碳：碳分子筛的性能优于活性炭

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-07 DOI: 10.1016/j.seppur.2026.137190

Heak Vannak , Kakeru Fujiwara , Yugo Osaka , Takuya Tsujiguchi , Akio Kodama

Water vapor in the flue gas typically reduces the CO₂ adsorption capacity of physical adsorbents, and chemical absorption requires significant energy for water desorption. Despite active research into CO₂ adsorbents that do not adsorb/absorb water, practical materials remain elusive. It is also desirable to perform low-temperature regeneration using combustion waste heat. Herein, carbon molecular sieves (CMS) and activated carbon were evaluated as hydrophobic adsorbents. The CO₂ recovery performance of the temperature swing adsorption process using low-temperature internal heating and an air purge was investigated under wet and dry conditions. Under a temperature swing of 20–80 °C, CMS outperformed activated carbon in simple adsorption–desorption measurements, and there was no significant decrease in CO₂ separation performance when the feed gas contained moisture. A recirculating process with CMS was then implemented to increase CO₂ purity and recovery. Under wet conditions (dew point temperature of 15 °C), CMS achieved a CO₂ purity of 43% (adsorbed from a simulated feed gas containing ∼10% CO₂) and a recovery ratio of 50%, which are around 1.5 times higher than those obtained by simple adsorption–desorption. Using a two-stage adsorption process under the same wet conditions, the CO₂ purity of the product gas reached 64% (recovery ratio of 51%). Further enrichment by modifying the operating conditions raised the CO₂ purity to 74.7% (recovery ratio of 35%). Ultimately, hydrophobic adsorbents can effectively capture CO₂ from wet flue gas without prior dehumidification. However, further research is needed to optimize the process maximize both CO₂ purity and recovery.

烟气中的水蒸气通常会降低物理吸附剂对CO2的吸附能力，而化学吸收需要大量的能量。

{"title":"Advancing high-purity CO2 capture from wet flue gas using air-purge-enhanced low-grade-heat TSA with carbon-based adsorbents: Carbon molecular sieves outperform activated carbon","authors":"Heak Vannak , Kakeru Fujiwara , Yugo Osaka , Takuya Tsujiguchi , Akio Kodama","doi":"10.1016/j.seppur.2026.137190","DOIUrl":"10.1016/j.seppur.2026.137190","url":null,"abstract":"<div><div>Water vapor in the flue gas typically reduces the CO<sub>2</sub> adsorption capacity of physical adsorbents, and chemical absorption requires significant energy for water desorption. Despite active research into CO<sub>2</sub> adsorbents that do not adsorb/absorb water, practical materials remain elusive. It is also desirable to perform low-temperature regeneration using combustion waste heat. Herein, carbon molecular sieves (CMS) and activated carbon were evaluated as hydrophobic adsorbents. The CO<sub>2</sub> recovery performance of the temperature swing adsorption process using low-temperature internal heating and an air purge was investigated under wet and dry conditions. Under a temperature swing of 20–80 °C, CMS outperformed activated carbon in simple adsorption–desorption measurements, and there was no significant decrease in CO<sub>2</sub> separation performance when the feed gas contained moisture. A recirculating process with CMS was then implemented to increase CO<sub>2</sub> purity and recovery. Under wet conditions (dew point temperature of 15 °C), CMS achieved a CO<sub>2</sub> purity of 43% (adsorbed from a simulated feed gas containing ∼10% CO<sub>2</sub>) and a recovery ratio of 50%, which are around 1.5 times higher than those obtained by simple adsorption–desorption. Using a two-stage adsorption process under the same wet conditions, the CO<sub>2</sub> purity of the product gas reached 64% (recovery ratio of 51%). Further enrichment by modifying the operating conditions raised the CO<sub>2</sub> purity to 74.7% (recovery ratio of 35%). Ultimately, hydrophobic adsorbents can effectively capture CO<sub>2</sub> from wet flue gas without prior dehumidification. However, further research is needed to optimize the process maximize both CO<sub>2</sub> purity and recovery.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137190"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146153689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic responses of nZVI-LDH@biochar to key environmental factors in inorganic nitrogen removal nZVI-LDH@biochar对无机脱氮过程中关键环境因子的动态响应

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-04 DOI: 10.1016/j.seppur.2026.137163

Yiming Xie , Guangzhu Cao , Ronggao Qin , Ciming Kong , Yi Qiang , Yingying Wu , Fangling Cheng , Yanfeng Lu , Ming Li

Excessive inorganic nitrogen in soil and water causes persistent regional pollution. To deeply address this, we utilized a nano zero-valent iron (nZVI)-layered double hydroxides (LDH)@biochar composite (nZVI-LDH-BC) to achieve coordinated, green removal of ammonium (NH₄⁺) and nitrate (NO₃⁻) ions via adsorption and redox pathways. The composite's performance was systematically evaluated. It significantly outperformed single-phase traditional precursors under optimal conditions. Specifically, NH₄⁺ removal rates and N₂N selectivity increased by 1.01–5.71 times and 1.89–2.22 times, while NO₃⁻ values improved by 1.47–16.06 times and 1.82–2.57 times. In the comparison of the material types, we observed optimal inorganic nitrogen degradation rates of 3.75 mg/(L·h) and 4.14 mg/(L·h), alongside corresponding N₂N selectivities of 85.29 wt% and 92.15 wt%. In addition, environmental factors regulated removal rates between 40.39% and 100%, while N₂ selectivity fluctuated in the range of 16.81–93.69 wt%. Redundancy analysis identified pH, light intensity, and initial concentration as key factors driving removal rates and N₂N selectivity. Conditions for optimal removal rates included no interfering ions, more and stronger light, an initial concentration of 100 mg/L, and pH 9 or pH 5. In contrast, the differences in conditions favoring N₂ selectivity included K⁺ (10 mg/L), a 1:4 mixing ratio, initial concentrations of 350 mg/L, and pH 7 or pH 9. This study establishes a reference for the environmental applicability of nZVI-LDH-BC. Besides, these findings offer guidance for research on synergistic NH₄⁺ and NO₃⁻ removal and the selection of environments for long-term application.

土壤和水中过量的无机氮会造成持续的区域污染。为了深入解决这一问题，我们利用纳米零价铁(nZVI)-层状双氢氧化物（LDH）@生物炭复合材料（nZVI-LDH- bc）通过吸附和氧化还原途径实现铵离子（NH4+）和硝酸盐（NO3−）离子的协同绿色去除。对复合材料的性能进行了系统评价。在最佳条件下，其性能明显优于单相传统前驱体。NH4+去除率和N2N选择性分别提高了1.01 ~ 5.71倍和1.89 ~ 2.22倍，NO3−去除率分别提高了1.47 ~ 16.06倍和1.82 ~ 2.57倍。在材料类型的比较中，我们观察到最佳的无机氮降解率为3.75 mg/（L·h）和4.14 mg/(L·h)，相应的N2N选择性为85.29 wt%和92.15 wt%。环境因素对去除率的影响在40.39% ~ 100%之间，N2选择性在16.81 ~ 93.69 wt%之间波动。冗余分析发现pH、光照强度和初始浓度是影响N2N去除率和选择性的关键因素。最佳去除率条件为无干扰离子、光照强、初始浓度为100 mg/L、pH为 9或 5。相比之下，有利于N2选择性的条件包括K+（10 mg/L）、1:4的混合比、初始浓度350 mg/L、pH 7或pH 9。本研究为nZVI-LDH-BC的环境适用性提供了参考。此外，这些发现对协同去除NH4+和NO3−的研究以及长期应用环境的选择具有指导意义。

{"title":"Dynamic responses of nZVI-LDH@biochar to key environmental factors in inorganic nitrogen removal","authors":"Yiming Xie , Guangzhu Cao , Ronggao Qin , Ciming Kong , Yi Qiang , Yingying Wu , Fangling Cheng , Yanfeng Lu , Ming Li","doi":"10.1016/j.seppur.2026.137163","DOIUrl":"10.1016/j.seppur.2026.137163","url":null,"abstract":"<div><div>Excessive inorganic nitrogen in soil and water causes persistent regional pollution. To deeply address this, we utilized a nano zero-valent iron (nZVI)-layered double hydroxides (LDH)@biochar composite (nZVI-LDH-BC) to achieve coordinated, green removal of ammonium (NH<sub>4</sub><sup>+</sup>) and nitrate (NO<sub>3</sub><sup>−</sup>) ions via adsorption and redox pathways. The composite's performance was systematically evaluated. It significantly outperformed single-phase traditional precursors under optimal conditions. Specifically, NH<sub>4</sub><sup>+</sup> removal rates and N<sub>2</sub><img>N selectivity increased by 1.01–5.71 times and 1.89–2.22 times, while NO<sub>3</sub><sup>−</sup> values improved by 1.47–16.06 times and 1.82–2.57 times. In the comparison of the material types, we observed optimal inorganic nitrogen degradation rates of 3.75 mg/(L·h) and 4.14 mg/(L·h), alongside corresponding N<sub>2</sub><img>N selectivities of 85.29 wt% and 92.15 wt%. In addition, environmental factors regulated removal rates between 40.39% and 100%, while N<sub>2</sub> selectivity fluctuated in the range of 16.81–93.69 wt%. Redundancy analysis identified pH, light intensity, and initial concentration as key factors driving removal rates and N<sub>2</sub><img>N selectivity. Conditions for optimal removal rates included no interfering ions, more and stronger light, an initial concentration of 100 mg/L, and pH 9 or pH 5. In contrast, the differences in conditions favoring N<sub>2</sub> selectivity included K<sup>+</sup> (10 mg/L), a 1:4 mixing ratio, initial concentrations of 350 mg/L, and pH 7 or pH 9. This study establishes a reference for the environmental applicability of nZVI-LDH-BC. Besides, these findings offer guidance for research on synergistic NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>−</sup> removal and the selection of environments for long-term application.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137163"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From prediction to design: An XGBoost-genetic algorithm framework for high-performance ionic liquids design in CO2 capture blends 从预测到设计：用于CO2捕集混合物中高性能离子液体设计的xgboost遗传算法框架

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-08 DOI: 10.1016/j.seppur.2026.137192

Guiyang Ye , Zhouhong Li , Yongwen Xu , Zhengrui Li , Tenxian Qin , Jiaoying Huang , Zhi Yang , Junyao Wang

Amine-ionic liquid (Amine-IL) blends combine the high CO₂ absorption of alkanolamines with the stability of ionic liquids for efficient carbon capture and reduced energy consumption. In this study, we developed an inverse design framework that integrates machine learning and a genetic algorithm (GA) for the intelligent design of high-performance ionic liquids. The framework uses an XGBoost model to predict CO₂ absorption capacity, employs SHAP analysis to elucidate structure-property relationships, and leverages the GA for molecular structure optimization aimed at maximizing CO₂ loading. Systematic evaluation of 12 MDEA-IL blends (867 experimental data points) shows that the comparison between the group contribution method and RDKit descriptors yields similar accuracy in predicting CO₂ absorption capacity, thereby validating the rationality of the selected molecular fragments. SHAP analysis identifies pressure as the most influential parameter and highlights the positive contribution of CH₂ group to CO₂ loading. Under simulated flue gas conditions, the framework successfully designs novel ionic liquids, with a candidate consisting of [Im₁₃]⁺ and [Ac]⁻ achieving optimal CO₂ loading (1.1048–1.1212 mol/mol) across all pressure regimes, outperforming existing benchmark systems.

胺离子液体（Amine-IL）混合物将烷醇胺的高二氧化碳吸收量与离子液体的稳定性相结合，从而实现高效的碳捕获和降低能耗。在这项研究中，我们开发了一个集成了机器学习和遗传算法（GA）的逆设计框架，用于高性能离子液体的智能设计。该框架使用XGBoost模型预测CO2吸收能力，使用SHAP分析阐明结构-性能关系，并利用遗传算法进行分子结构优化，旨在最大限度地提高CO2负载。对12个MDEA-IL混合物（867个实验数据点）的系统评价表明，基团贡献法与RDKit描述符的比较在预测CO2吸收能力方面具有相似的准确性，从而验证了所选分子片段的合理性。SHAP分析认为压力是影响最大的参数，并强调CH2基团对CO2负荷的正贡献。在模拟烟气条件下，该框架成功设计了新型离子液体，候选离子液体由[Im13]+和[Ac]−组成，在所有压力范围内实现最佳二氧化碳负荷（1.1048-1.1212 mol/mol），优于现有的基准系统。

{"title":"From prediction to design: An XGBoost-genetic algorithm framework for high-performance ionic liquids design in CO2 capture blends","authors":"Guiyang Ye , Zhouhong Li , Yongwen Xu , Zhengrui Li , Tenxian Qin , Jiaoying Huang , Zhi Yang , Junyao Wang","doi":"10.1016/j.seppur.2026.137192","DOIUrl":"10.1016/j.seppur.2026.137192","url":null,"abstract":"<div><div>Amine-ionic liquid (Amine-IL) blends combine the high CO<sub>2</sub> absorption of alkanolamines with the stability of ionic liquids for efficient carbon capture and reduced energy consumption. In this study, we developed an inverse design framework that integrates machine learning and a genetic algorithm (GA) for the intelligent design of high-performance ionic liquids. The framework uses an XGBoost model to predict CO<sub>2</sub> absorption capacity, employs SHAP analysis to elucidate structure-property relationships, and leverages the GA for molecular structure optimization aimed at maximizing CO<sub>2</sub> loading. Systematic evaluation of 12 MDEA-IL blends (867 experimental data points) shows that the comparison between the group contribution method and RDKit descriptors yields similar accuracy in predicting CO<sub>2</sub> absorption capacity, thereby validating the rationality of the selected molecular fragments. SHAP analysis identifies pressure as the most influential parameter and highlights the positive contribution of CH<sub>2</sub> group to CO<sub>2</sub> loading. Under simulated flue gas conditions, the framework successfully designs novel ionic liquids, with a candidate consisting of [Im<sub>13</sub>]<sup>+</sup> and [Ac]<sup>−</sup> achieving optimal CO<sub>2</sub> loading (1.1048–1.1212 mol/mol) across all pressure regimes, outperforming existing benchmark systems.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137192"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146135502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular mechanisms and process intensification for green separation of the n-propanol/acetonitrile/water azeotrope via extractive pressure-swing distillation with thermal and membrane integration 热膜一体化萃取变压精馏绿色分离正丙醇/乙腈/水共沸物的分子机理及工艺强化

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-09 DOI: 10.1016/j.seppur.2026.137157

Ke Huang , Junzhong Wang , Wenwen Shi , Mengying Li , Binyan Zhang , Zeguang Zhou , Yanyue Lu , Yinglong Wang

N-propanol (N-PRO), acetonitrile (ACN), and water form a ternary azeotropic system. To efficiently recover n-propanol (N-PRO) and acetonitrile (ACN) from wastewater, a basic extractive pressure-swing distillation (EPSD) process was designed based on pressure sensitivity analysis. Firstly, ethylene glycol (EG) was selected as the optimal extractant through relative volatility calculation. The interaction process between EG and N-PRO as well as ACN was analyzed using quantum chemical calculations, and the extractive distillation separation mechanism of EG as an extractant was revealed. Subsequently, the three integrated intensified processes were designed by incorporating heat integration, steam recompression, and pervaporation (PV) technology, namely thermal integrated extractive pressure-swing distillation (HI-EPSD), steam recompression coupled with thermal integrated extractive pressure-swing distillation (SR-EPSD), and extractive pressure-swing distillation coupled with pervaporation (EPSD-PV). For the EPSD-PV process, the polyvinyl alcohol membrane modified with nano-silica was used. Then, molecular dynamics simulations were performed to calculate the diffusion coefficients of solutes in the membrane, and a mass transfer model for the PV process was established. Finally, all processes were simulated using the Aspen Plus software. A multi-objective genetic algorithm was adopted to optimize the process parameters with the objectives of minimizing total annual cost (TAC) and minimizing gas emissions. The three integrated processes were evaluated from four dimensions: economics, environment, energy consumption, and exergy efficiency. The results show that compared with the EPSD process, the SR-EPSD process has the most significant effects in reducing energy consumption (by 29.66%) and decreasing gas emissions (by 26.8%). while the EPSD-PV process exhibits the best performance in terms of TAC reduction (by 14.18%) and exergy efficiency. This study provides a green and economical solution for the treatment of industrial wastewater containing N-PRO and ACN.

n -丙醇（N-PRO）、乙腈（ACN）和水形成三元共沸体系。为高效回收废水中的正丙醇（N-PRO）和乙腈（ACN），设计了基于压力敏感性分析的基本萃取变压精馏（EPSD）工艺。首先，通过相对挥发度计算，选择乙二醇（EG）为最佳萃取剂；利用量子化学计算分析了EG与N-PRO和ACN的相互作用过程，揭示了EG作为萃取剂的萃取精馏分离机理。随后，结合热集成、蒸汽再压缩和渗透蒸发（PV）技术，设计了热集成萃取变压蒸馏（HI-EPSD）、蒸汽再压缩-热集成萃取变压蒸馏（SR-EPSD）和萃取变压蒸馏-渗透蒸发（EPSD-PV） 3个一体化强化工艺。在EPSD-PV工艺中，采用纳米二氧化硅改性聚乙烯醇膜。然后，通过分子动力学模拟计算溶质在膜中的扩散系数，建立PV过程的传质模型。最后，使用Aspen Plus软件对所有过程进行模拟。采用多目标遗传算法对工艺参数进行优化，以年总成本最小和气体排放最小为目标。从经济、环境、能源消耗和能源效率四个方面对这三个综合过程进行了评估。结果表明，与EPSD工艺相比，SR-EPSD工艺在降低能耗（29.66%）和气体排放（26.8%）方面的效果最为显著。而EPSD-PV工艺在TAC降低（14.18%）和火用效率方面表现最佳。本研究为含N-PRO和ACN的工业废水的处理提供了一种绿色经济的解决方案。

{"title":"Molecular mechanisms and process intensification for green separation of the n-propanol/acetonitrile/water azeotrope via extractive pressure-swing distillation with thermal and membrane integration","authors":"Ke Huang , Junzhong Wang , Wenwen Shi , Mengying Li , Binyan Zhang , Zeguang Zhou , Yanyue Lu , Yinglong Wang","doi":"10.1016/j.seppur.2026.137157","DOIUrl":"10.1016/j.seppur.2026.137157","url":null,"abstract":"<div><div>N-propanol (N-PRO), acetonitrile (ACN), and water form a ternary azeotropic system. To efficiently recover n-propanol (N-PRO) and acetonitrile (ACN) from wastewater, a basic extractive pressure-swing distillation (EPSD) process was designed based on pressure sensitivity analysis. Firstly, ethylene glycol (EG) was selected as the optimal extractant through relative volatility calculation. The interaction process between EG and N-PRO as well as ACN was analyzed using quantum chemical calculations, and the extractive distillation separation mechanism of EG as an extractant was revealed. Subsequently, the three integrated intensified processes were designed by incorporating heat integration, steam recompression, and pervaporation (PV) technology, namely thermal integrated extractive pressure-swing distillation (HI-EPSD), steam recompression coupled with thermal integrated extractive pressure-swing distillation (SR-EPSD), and extractive pressure-swing distillation coupled with pervaporation (EPSD-PV). For the EPSD-PV process, the polyvinyl alcohol membrane modified with nano-silica was used. Then, molecular dynamics simulations were performed to calculate the diffusion coefficients of solutes in the membrane, and a mass transfer model for the PV process was established. Finally, all processes were simulated using the Aspen Plus software. A multi-objective genetic algorithm was adopted to optimize the process parameters with the objectives of minimizing total annual cost (TAC) and minimizing gas emissions. The three integrated processes were evaluated from four dimensions: economics, environment, energy consumption, and exergy efficiency. The results show that compared with the EPSD process, the SR-EPSD process has the most significant effects in reducing energy consumption (by 29.66%) and decreasing gas emissions (by 26.8%). while the EPSD-PV process exhibits the best performance in terms of TAC reduction (by 14.18%) and exergy efficiency. This study provides a green and economical solution for the treatment of industrial wastewater containing N-PRO and ACN.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137157"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sodium alginate sustained magnetic vanadate hydr(oxide) hydrogel beads for robust, selective, and record-high uptake of tetracycline from waters 海藻酸钠持续磁性钒酸氢（氧化物）水凝胶珠稳健，选择性和创纪录的高四环素从水中摄取

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-02 DOI: 10.1016/j.seppur.2026.137132

Kamatchi Rubini, Triveni Rajashekhar Mandlimath

This study mainly focuses on the development of magnetic vanadium oxide (IVO) reinforced by sodium alginate (Alg) to form hydrogel beads. The as-prepared hydrogel beads were characterized before and after the adsorption of tetracycline (TC) by several spectro-analytical techniques, including powder XRD, FE-SEM, TGA, and XPS. The maximum adsorption densities of 3.254 mmol/g on IVO@Alg hydrogel beads were calculated by a non-linear Langmuir adsorption isotherm model. This value is one of the record-high adsorption densities among the materials reported in the literature. The chemical interaction between the adsorbent and adsorbate was confirmed by the kinetic models. The IVO@Alg hydrogel beads were independent of the pH conditions, and they could be used in the extensive pH range from 3 to 12 and were highly selective in the coexistence of binary organic solutions. After seven repeated cycle studies, the studied material showed excellent stability, confirmed by PXRD and FE-SEM analysis. The XPS analysis of TC adsorbed on IVO@Alg hydrogel beads revealed the presence of N-is the indication of successful adsorption of TC onto the IVO@Alg hydrogel beads. The material was also tested with the waters collected from the fields and found that the material is highly selective and suitable for practical applications. This adsorbent stands out as the optimal choice for eliminating TC with high stability from water, due to its remarkable adsorption capacity and simplicity of separation, attributed to its distinctive characteristics.

本研究主要研究海藻酸钠（Alg）增强磁性氧化钒（IVO）形成水凝胶珠的方法。采用粉末XRD、FE-SEM、TGA、XPS等多种光谱分析技术对制备的水凝胶珠吸附四环素前后进行了表征。采用非线性Langmuir吸附等温线计算得到IVO@Alg水凝胶珠的最大吸附密度为3.254 mmol/g。该值是文献报道的材料中吸附密度最高的值之一。动力学模型证实了吸附剂和吸附物之间的化学相互作用。IVO@Alg水凝胶珠不受pH条件的影响，可以在3 ~ 12的广泛pH范围内使用，并且对二元有机溶液的共存具有很高的选择性。经过7次重复循环研究，材料的稳定性得到了PXRD和FE-SEM的证实。吸附在IVO@Alg水凝胶珠上的TC的XPS分析表明，n的存在表明IVO@Alg水凝胶珠上成功吸附了TC。该材料还与从田间收集的水进行了测试，发现该材料具有很高的选择性，适合实际应用。该吸附剂具有显著的吸附能力和简单的分离特性，是去除水中高稳定性TC的最佳选择。

{"title":"Sodium alginate sustained magnetic vanadate hydr(oxide) hydrogel beads for robust, selective, and record-high uptake of tetracycline from waters","authors":"Kamatchi Rubini, Triveni Rajashekhar Mandlimath","doi":"10.1016/j.seppur.2026.137132","DOIUrl":"10.1016/j.seppur.2026.137132","url":null,"abstract":"<div><div>This study mainly focuses on the development of magnetic vanadium oxide (IVO) reinforced by sodium alginate (Alg) to form hydrogel beads. The as-prepared hydrogel beads were characterized before and after the adsorption of tetracycline (TC) by several spectro-analytical techniques, including powder XRD, FE-SEM, TGA, and XPS. The maximum adsorption densities of 3.254 mmol/g on IVO@Alg hydrogel beads were calculated by a non-linear Langmuir adsorption isotherm model. This value is one of the record-high adsorption densities among the materials reported in the literature. The chemical interaction between the adsorbent and adsorbate was confirmed by the kinetic models. The IVO@Alg hydrogel beads were independent of the pH conditions, and they could be used in the extensive pH range from 3 to 12 and were highly selective in the coexistence of binary organic solutions. After seven repeated cycle studies, the studied material showed excellent stability, confirmed by PXRD and FE-SEM analysis. The XPS analysis of TC adsorbed on IVO@Alg hydrogel beads revealed the presence of N-is the indication of successful adsorption of TC onto the IVO@Alg hydrogel beads. The material was also tested with the waters collected from the fields and found that the material is highly selective and suitable for practical applications. This adsorbent stands out as the optimal choice for eliminating TC with high stability from water, due to its remarkable adsorption capacity and simplicity of separation, attributed to its distinctive characteristics.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137132"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146101345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrating coagulation and submerged nanofiltration for achieving low-energy drinking water treatment 集混凝与浸没纳滤于一体，实现低能耗饮用水处理

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-07 DOI: 10.1016/j.seppur.2026.137171

Sandrine Boivin , Hideaki Sano , Tetsuji Okuda , Takahiro Fujioka

Membrane fouling continues to be a major challenge for the long-term sustainability of nanofiltration (NF) systems used in surface water treatment, highlighting the need for effective pretreatment strategies to mitigate this issue. This study evaluated the effect of pre-coagulation with polyaluminum chloride (PACl) on fouling reduction in a submerged flat-sheet NF membrane system. An optimized dose of PACl and two mixing conditions were tested: rapid mixing followed by slow mixing and rapid mixing alone. Both PACl pre-coagulation methods significantly decreased turbidity and mitigated fouling compared to direct filtration. However, the combination of rapid and slow mixing proved more effective, resulting in a 24% increase in transmembrane pressure (TMP) after 24 d compared to a 32% increase with rapid mixing alone. The mixing conditions led to different fouling mechanisms and cake-layer characteristics. The combination of rapid and slow mixing produced a thin layer with minimal hydraulic resistance, whereas rapid mixing alone resulted in higher residual turbidity and the formation of a thick, gelatinous cake layer. Although operationally simpler, the rapid mixing alone approach offers less fouling mitigation and organic matter removal. However, the optimal rapid and slow mixing conditions showed a downside: they created a favorable environment for biofouling, as indicated by an increase in TMP after 17 d. This study underscores that PACl pre-coagulation effectively mitigates membrane fouling; however, strategies to actively manage the resulting fouling conditions are crucial for ensuring the long-term reliable performance and implementation of submerged NF systems for sustainable advanced water treatment.

膜污染仍然是地表水处理中使用的纳滤（NF）系统长期可持续性的主要挑战，强调需要有效的预处理策略来缓解这一问题。本研究评估了聚合氯化铝（PACl）预混凝对浸没式平板纳滤膜系统中污染的减少效果。研究了PACl的最佳剂量和快速混合后缓慢混合和单独快速混合两种混合条件。与直接过滤相比，两种PACl预混凝方法都显著降低了浊度并减轻了污染。然而，快速和缓慢混合被证明更有效，导致24 d后跨膜压力（TMP）增加24%，而单独快速混合增加32%。不同的混合条件导致不同的结垢机理和饼层特性。快速和缓慢混合的组合产生了薄层，水力阻力最小，而单独快速混合导致更高的残留浊度和形成厚的凝胶状饼层。虽然操作简单，但单独快速混合的方法减少了污垢和有机物的去除。然而，最优的快速和慢速混合条件有一个缺点：它们为生物污染创造了有利的环境，正如17 d后TMP的增加所表明的那样。本研究强调PACl预混凝有效地减轻了膜污染；然而，积极管理由此产生的污染条件的策略对于确保浸没式纳滤系统的长期可靠性能和实施可持续高级水处理至关重要。

{"title":"Integrating coagulation and submerged nanofiltration for achieving low-energy drinking water treatment","authors":"Sandrine Boivin , Hideaki Sano , Tetsuji Okuda , Takahiro Fujioka","doi":"10.1016/j.seppur.2026.137171","DOIUrl":"10.1016/j.seppur.2026.137171","url":null,"abstract":"<div><div>Membrane fouling continues to be a major challenge for the long-term sustainability of nanofiltration (NF) systems used in surface water treatment, highlighting the need for effective pretreatment strategies to mitigate this issue. This study evaluated the effect of pre-coagulation with polyaluminum chloride (PACl) on fouling reduction in a submerged flat-sheet NF membrane system. An optimized dose of PACl and two mixing conditions were tested: rapid mixing followed by slow mixing and rapid mixing alone. Both PACl pre-coagulation methods significantly decreased turbidity and mitigated fouling compared to direct filtration. However, the combination of rapid and slow mixing proved more effective, resulting in a 24% increase in transmembrane pressure (TMP) after 24 d compared to a 32% increase with rapid mixing alone. The mixing conditions led to different fouling mechanisms and cake-layer characteristics. The combination of rapid and slow mixing produced a thin layer with minimal hydraulic resistance, whereas rapid mixing alone resulted in higher residual turbidity and the formation of a thick, gelatinous cake layer. Although operationally simpler, the rapid mixing alone approach offers less fouling mitigation and organic matter removal. However, the optimal rapid and slow mixing conditions showed a downside: they created a favorable environment for biofouling, as indicated by an increase in TMP after 17 d. This study underscores that PACl pre-coagulation effectively mitigates membrane fouling; however, strategies to actively manage the resulting fouling conditions are crucial for ensuring the long-term reliable performance and implementation of submerged NF systems for sustainable advanced water treatment.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137171"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainable phosphorus recovery at UiO-66-NH2@PPy composite electrode via capacitive deionization 通过电容去离子在UiO-66-NH2@PPy复合电极上实现磷的可持续回收

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-05 DOI: 10.1016/j.seppur.2026.137137

Yuehan Li , Luyi Chen , Boshuang Zhang , Yiwen Wang , Chenyu Song , Jianmao Yang , Jianyun Liu

The selective removal and recovery of phosphorus from wastewater are critical for mitigating eutrophication and ensuring sustainable use of these non-renewable resources. Capacitive deionization (CDI) offers a promising electrochemical route for phosphate separation; yet its performance is often constrained by the insufficient affinity and selectivity of conventional electrode materials. Herein, we rationally designed a conductive polypyrrole-MOF-composite (UiO-66-NH₂@PPy) through low-temperature in-situ polymerization of pyrrole onto a zirconium-based metal-organic framework (UiO-66-NH₂). The resulting architecture integrated the strong phosphate-binding capability of Zr–O clusters with the superior conductivity and electroactivity of PPy, generating an optimized interfacial structure that facilitates charge transport and increases selective active sites. When employed as a Faradaic anode in a CDI system, UiO-66-NH₂@PPy electrode achieved a high phosphate adsorption capacity of 86.20 mg P/g from a 50 mg P/L solution at 1.2 V, along with high selectivity. Importantly, the electrode demonstrated robust performance in farm ditch wastewater, achieving a phosphate recovery efficiency of 72.72%. This study highlights significant potential of conductive polymer-MOF composites as a compelling class of CDI electrodes for sustainable phosphate removal and recovery from complex aquatic environments.

从废水中选择性去除和回收磷对于减轻富营养化和确保这些不可再生资源的可持续利用至关重要。电容去离子（CDI）是一种很有前途的磷酸分离电化学途径；然而，它的性能往往受到传统电极材料亲和力和选择性不足的限制。本文通过在锆基金属有机骨架（uuo -66- nh2）上低温原位聚合吡咯，合理设计了导电聚吡咯- mof复合材料（UiO-66-NH2@PPy）。该结构将Zr-O簇的强磷酸盐结合能力与PPy优异的导电性和电活性结合在一起，生成了优化的界面结构，促进了电荷传输并增加了选择性活性位点。当在CDI系统中作为法拉第阳极时，UiO-66-NH2@PPy电极在1.2 V电压下对50 mg P/L溶液的磷酸盐具有很高的吸附能力，吸附量为86.20 mg P/g，并且具有很高的选择性。重要的是，该电极在农田沟渠废水中表现出强劲的性能，磷酸盐回收率达到72.72%。这项研究强调了导电聚合物- mof复合材料作为一种引人注目的CDI电极的巨大潜力，可以从复杂的水生环境中可持续地去除和回收磷酸盐。

{"title":"Sustainable phosphorus recovery at UiO-66-NH2@PPy composite electrode via capacitive deionization","authors":"Yuehan Li , Luyi Chen , Boshuang Zhang , Yiwen Wang , Chenyu Song , Jianmao Yang , Jianyun Liu","doi":"10.1016/j.seppur.2026.137137","DOIUrl":"10.1016/j.seppur.2026.137137","url":null,"abstract":"<div><div>The selective removal and recovery of phosphorus from wastewater are critical for mitigating eutrophication and ensuring sustainable use of these non-renewable resources. Capacitive deionization (CDI) offers a promising electrochemical route for phosphate separation; yet its performance is often constrained by the insufficient affinity and selectivity of conventional electrode materials. Herein, we rationally designed a conductive polypyrrole-MOF-composite (UiO-66-NH<sub>2</sub>@PPy) through low-temperature in-situ polymerization of pyrrole onto a zirconium-based metal-organic framework (UiO-66-NH<sub>2</sub>). The resulting architecture integrated the strong phosphate-binding capability of Zr–O clusters with the superior conductivity and electroactivity of PPy, generating an optimized interfacial structure that facilitates charge transport and increases selective active sites. When employed as a Faradaic anode in a CDI system, UiO-66-NH<sub>2</sub>@PPy electrode achieved a high phosphate adsorption capacity of 86.20 mg P/g from a 50 mg P/L solution at 1.2 V, along with high selectivity. Importantly, the electrode demonstrated robust performance in farm ditch wastewater, achieving a phosphate recovery efficiency of 72.72%. This study highlights significant potential of conductive polymer-MOF composites as a compelling class of CDI electrodes for sustainable phosphate removal and recovery from complex aquatic environments.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137137"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An integrated coalescence-air stripping process for deepwater gas field produced water treatment 深水气田采出水聚结—气提一体化处理工艺

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-01 DOI: 10.1016/j.seppur.2026.137098

Jinwei Xue, Pinyi Dai, Guangyao Zhang, Zhongning Cao, Yaohua Huang, Yu Li, Yiqian Liu, Hao Lu, Qiang Yang

The exploration and development of offshore gas fields are continuously expanding into deeper sea areas. The produced water from gas field platforms has complex organic components, which poses significant challenges to the discharge of produced water and the increase of natural gas production. Based on a comprehensive analysis of the produced water characteristics from the platform, it is found that the produced water contains a large number of submicron-sized oil droplets with strong stability. Therefore, this study explored the feasibility of the integrated coalescence-air stripping physical treatment method. Among them, the composite fiber knots (CFK) coalescing filter can efficiently disrupt the stability of emulsions and remove oil from water. The air stripping effectively enhances the evaporation of volatile organic compounds. The results of the on-site tests show that this integrated physical process has excellent separation efficiency for different types of produced water, and the oil content in the process effluent can be reduced to 35 mg/L during long-term operation. This integrated coalescence-air stripping process not only successfully provides a promising technical solution for the produced water treatment, but also offers strong support for promoting clean production and ecological protection

海上油气田勘探开发不断向深海扩展。气田平台采出水有机成分复杂，对采出水的排放和天然气产量的提高提出了重大挑战。综合分析平台采出水特征，发现采出水中含有大量亚微米级油滴，稳定性强。因此，本研究探索聚结-气提一体化物理处理方法的可行性。其中，复合纤维结（CFK）聚结过滤器可以有效地破坏乳液的稳定性，并去除水中的油。空气剥离有效地促进了挥发性有机物的蒸发。现场试验结果表明，该综合物理工艺对不同类型的采出水具有优异的分离效果，长期运行可将工艺出水含油量降至35 mg/L。聚结—气提一体化工艺不仅成功地为采出水处理提供了一种有前景的技术解决方案，而且为促进清洁生产和生态保护提供了有力的支持

{"title":"An integrated coalescence-air stripping process for deepwater gas field produced water treatment","authors":"Jinwei Xue, Pinyi Dai, Guangyao Zhang, Zhongning Cao, Yaohua Huang, Yu Li, Yiqian Liu, Hao Lu, Qiang Yang","doi":"10.1016/j.seppur.2026.137098","DOIUrl":"10.1016/j.seppur.2026.137098","url":null,"abstract":"<div><div>The exploration and development of offshore gas fields are continuously expanding into deeper sea areas. The produced water from gas field platforms has complex organic components, which poses significant challenges to the discharge of produced water and the increase of natural gas production. Based on a comprehensive analysis of the produced water characteristics from the platform, it is found that the produced water contains a large number of submicron-sized oil droplets with strong stability. Therefore, this study explored the feasibility of the integrated coalescence-air stripping physical treatment method. Among them, the composite fiber knots (CFK) coalescing filter can efficiently disrupt the stability of emulsions and remove oil from water. The air stripping effectively enhances the evaporation of volatile organic compounds. The results of the on-site tests show that this integrated physical process has excellent separation efficiency for different types of produced water, and the oil content in the process effluent can be reduced to 35 mg/L during long-term operation. This integrated coalescence-air stripping process not only successfully provides a promising technical solution for the produced water treatment, but also offers strong support for promoting clean production and ecological protection</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137098"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Excellent defluoridation performance of tricalcium phosphate as seed crystal for high fluoride groundwater 磷酸三钙种子晶对高氟地下水具有优良的除氟性能

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2026-06-19 Epub Date: 2026-02-11 DOI: 10.1016/j.seppur.2026.137230

Zhilong Huo , Yang Liu , Bofang Shi , Chunrong Yang , Xuyan Hu , Xiaofei Wang , Honghui Yang

The control and removal of fluoride from groundwater is critical for the safety of drinking water and human health. In this study, a method of using tricalcium phosphate (TCP) as a seed crystal to induce fluorapatite (FAP) crystallization for fluoride removal was proposed, and its performance and mechanism were studied. With TCP dosage of 2 g/L and Ca/P/F molar ratio of 4:3:1, the F⁻ concentration decreased from 9.5 to below 1 mg/L within 20 min and remained stable within a pH range of 3–10, superior to FAP/calcite seed crystal. However, the increased solubility of TCP at low pH leads to an increase in the proportion of homogeneous nucleation of FAP. Furthermore, the presence of Mg²⁺, SiO₃²⁻, HCO₃⁻, and citric acid inhibited the crystallization of FAP, leading to the reduction of defluoridation performance. Adjusting the pH of fluoridated groundwater from 8 to 6 effectively mitigated the adverse effects of high HCO₃⁻ levels in groundwater. During the defluoridation in a fluidized bed reactor (FBR) for fluoridated groundwater, a stable effluent F⁻ concentration of below 1 mg/L was demonstrated within the operation of 9 days. The potential defluoridation mechanism involves the initial binding of Ca²⁺ and phosphate ions to form various intermediate species, the interaction of intermediates with F⁻ and Ca²⁺ to generate FAP, and the dissolution or aggregation with other nuclei on the seed crystal surface. This study could provide references on the possible application of TCP in groundwater defluoridation.

控制和去除地下水中的氟化物对饮用水安全和人类健康至关重要。本研究提出了一种以磷酸三钙（TCP）为种子晶体诱导氟磷灰石（FAP）结晶除氟的方法，并对其性能和机理进行了研究。当TCP用量为2 g/L， Ca/P/F摩尔比为4:3:1时，F−浓度在20 min内由9.5降至1 mg/L以下，并在pH为3 ~ 10的范围内保持稳定，优于FAP/方解石种子晶体。然而，TCP在低pH下溶解度的增加导致FAP均形核比例的增加。此外，Mg2+、SiO32−、HCO3−和柠檬酸的存在抑制了FAP的结晶，导致除氟性能降低。将含氟地下水的pH值从8调整到6，可有效缓解地下水中HCO3−高含量的不利影响。在流化床反应器（FBR）对含氟地下水进行除氟的过程中，在9天的运行中，出水F−浓度稳定在1 mg/L以下。潜在的脱氟机制包括Ca2+和磷酸盐离子的初始结合形成各种中间体，中间体与F−和Ca2+相互作用产生FAP，以及与种子晶体表面其他核的溶解或聚集。本研究可为TCP在地下水除氟中的应用提供参考。

{"title":"Excellent defluoridation performance of tricalcium phosphate as seed crystal for high fluoride groundwater","authors":"Zhilong Huo , Yang Liu , Bofang Shi , Chunrong Yang , Xuyan Hu , Xiaofei Wang , Honghui Yang","doi":"10.1016/j.seppur.2026.137230","DOIUrl":"10.1016/j.seppur.2026.137230","url":null,"abstract":"<div><div>The control and removal of fluoride from groundwater is critical for the safety of drinking water and human health. In this study, a method of using tricalcium phosphate (TCP) as a seed crystal to induce fluorapatite (FAP) crystallization for fluoride removal was proposed, and its performance and mechanism were studied. With TCP dosage of 2 g/L and Ca/P/F molar ratio of 4:3:1, the F<sup>−</sup> concentration decreased from 9.5 to below 1 mg/L within 20 min and remained stable within a pH range of 3–10, superior to FAP/calcite seed crystal. However, the increased solubility of TCP at low pH leads to an increase in the proportion of homogeneous nucleation of FAP. Furthermore, the presence of Mg<sup>2+</sup>, SiO<sub>3</sub><sup>2−</sup>, HCO<sub>3</sub><sup>−</sup>, and citric acid inhibited the crystallization of FAP, leading to the reduction of defluoridation performance. Adjusting the pH of fluoridated groundwater from 8 to 6 effectively mitigated the adverse effects of high HCO<sub>3</sub><sup>−</sup> levels in groundwater. During the defluoridation in a fluidized bed reactor (FBR) for fluoridated groundwater, a stable effluent F<sup>−</sup> concentration of below 1 mg/L was demonstrated within the operation of 9 days. The potential defluoridation mechanism involves the initial binding of Ca<sup>2+</sup> and phosphate ions to form various intermediate species, the interaction of intermediates with F<sup>−</sup> and Ca<sup>2+</sup> to generate FAP, and the dissolution or aggregation with other nuclei on the seed crystal surface. This study could provide references on the possible application of TCP in groundwater defluoridation.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"392 ","pages":"Article 137230"},"PeriodicalIF":9.0,"publicationDate":"2026-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0