Journal of Environmental Chemical Engineering最新文献_第5页

Thin-film composite forward osmosis membrane with superior alkaline stability

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.114909

Wafa Suwaileh , Salahuddin Attar , Fatima Abu-Rub , Abdellatif El-Ghenym , Khaled ElSaid , Ahmed Badreldin , Mohammed Al-Hashimi , Ahmed Abdel-Wahab , Ahmed Abdala

The polyamide selective controls water permeation and selectivity in thin-film composite (TFC) membranes. In this study, we fabricated TFC forward osmosis (FO) membranes supported on ultrafiltration (UF) polyethersulfone (PES) through interfacial polymerization (IP) of 2,6-diaminopyridine (DAP) and trimesoyl chloride (TMC). IR spectroscopic and XPS analysis confirmed the successful formation of the DAP-polyamide selective layer on the PES substrate. The DAP-TFC membrane’s surface exhibited higher hydrophilicity, less roughness, and higher crosslinking density than conventional TFC membrane (MPD-TFC) prepared via IP of meta-phenylene diamine (MPD) and TMC. The robust DAP-TFC membrane exhibited higher water flux (6.7 LMH) and lower specific solute flux (SSF) of K+ (2.2 g/L) in FO testing using 0.6 M NaCl feed solution and 3.0 M KOH draw solution. Additionally, lower forward solute flux for Na⁺ (5.8 gMH) and Cl^- (9.5 gMH) and SSFs Na⁺ (0.9 g/L) and Cl^- (1.4 g/L) were achieved. Most importantly, the DAP-TFC membrane demonstrated excellent stability under extreme pH conditions, maintaining integrity for 60 h under FO mode with 0.6 M NaCl feed solution and 3 M KOH draw solution, in contrast to conventional MPD-TFC, which disintegrated after 5 h. The enhanced DAP-TFC membrane stability is attributed to formation of iminol tautomer, stabilizing H-bonding, facilitating reversible cation capture, and preventing hydrolysis, thereby improving chemical resistance and ion rejection. The alteration of the PA selective layer using DAP offers efficient approach for fabricating FO membranes with superior alkaline stability, holding great potential for industrial applications requiring high pH stability, particularly in challenging environments and demanding applications.

聚酰胺的选择性控制着薄膜复合（TFC）膜的透水性和选择性。在这项研究中，我们通过 2,6-二氨基吡啶（DAP）和三甲基甲酰氯（TMC）的界面聚合（IP），在超滤（UF）聚醚砜（PES）上制备了支持正渗透（FO）的 TFC 膜。红外光谱和 XPS 分析证实，在 PES 基底上成功形成了 DAP 聚酰胺选择层。与通过偏苯二胺（MPD）和 TMC 的 IP 制备的传统 TFC 膜（MPD-TFC）相比，DAP-TFC 膜的表面亲水性更高、粗糙度更小、交联密度更大。在使用 0.6 M NaCl 给水溶液和 3.0 M KOH 拉水溶液的 FO 测试中，坚固的 DAP-TFC 膜表现出更高的水通量（6.7 LMH）和更低的 K+ 特定溶质通量（SSF）（2.2 g/L）。此外，Na+（5.8 gMH）和 Cl-（9.5 gMH）的前向溶质通量以及 Na+（0.9 g/L）和 Cl-（1.4 g/L）的 SSF 均有所降低。最重要的是，DAP-TFC 膜在极端 pH 条件下表现出卓越的稳定性，在 0.6 M NaCl 进料溶液和 3 M KOH 抽取溶液的 FO 模式下，可在 60 小时内保持完整性，而传统的 MPD-TFC 膜则在 5 小时后瓦解。DAP-TFC 膜稳定性的增强归因于亚氨基醇同系物的形成、H 键的稳定、阳离子捕获的可逆性和水解的防止，从而提高了耐化学性和离子排斥性。使用 DAP 改变 PA 选择层为制造具有出色碱性稳定性的 FO 膜提供了有效方法，为需要高 pH 稳定性的工业应用提供了巨大潜力，特别是在具有挑战性的环境和要求苛刻的应用中。

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引用次数: 0

Improved visible light activation of peroxymonosulfate by novel Bi modified TiO2 /O-loaded g-C3N4 Z-scheme heterojunction for efficient degradation of trichloroethylene

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115039

Wang Lixiang , Ren Qiang , Wang Xiaoli

Through a facile sol-gel method, a novel Z-scheme heterojunction BTMO was synthesized by combining Bi-modified TiO₂ with oxygen-modified graphitic carbon nitride. Bi serves as an electron mediator in the catalyst, facilitating the transfer of excited electrons to MCN-O. Infrared characterization reveals that the doping of O increases the adsorption of peroxymonosulfate by the catalyst, promoting the reaction between electrons on the conduction band of MCN-O and PMS. The as-prepared BTMO Z-scheme heterojunction significantly improved the degradation rate of trichloroethylene was in BTMO/PMS system. TCE degradation efficiency in BTMO/PMS photocatalytic system could reach 99.8 % within 1 hour. According to the results of electron paramagnetic resonance and quenching experiments, sulfate radical and holes are the main reactive species in BTMO/PMS system. This novel photocatalyst also exhibited excellent durability. This work provides a new method for solving environmental problems through visible light photocatalysis.

通过一种简便的溶胶-凝胶法，将 Bi 改性 TiO2 与氧改性氮化石墨碳结合在一起，合成了一种新型 Z 型异质结 BTMO。Bi 在催化剂中充当电子介质，促进激发电子转移到 MCN-O。红外表征显示，O 的掺杂增加了催化剂对过氧化单硫酸盐的吸附，促进了 MCN-O 和 PMS 传导带电子之间的反应。所制备的 BTMO Z 型异质结显著提高了 BTMO/PMS 体系中三氯乙烯的降解率。在 BTMO/PMS 光催化体系中，1 小时内三氯乙烯的降解效率可达 99.8%。根据电子顺磁共振和淬灭实验的结果，硫酸根自由基和空穴是 BTMO/PMS 体系中的主要反应物种。这种新型光催化剂还表现出卓越的耐久性。这项工作为通过可见光光催化解决环境问题提供了一种新方法。

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引用次数: 0

A review of adsorbents engineered from biological materials developed to remediate estrogen pollution in the environment

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115274

Trevor Bell , Jason Robert Tavares , Marie-Josée Dumont

Rising concerns over anthropogenic impacts on the environment have increased environmental pollution and water quality research which have demonstrated widespread pollutants characteristics in their low concentrations and few government regulations. Pharmaceuticals are an important subcategory of emerging contaminant pollution which consists of natural and synthetic compounds. Steroids are a notable class of pharmaceutical pollutants due to their high binding affinities and activation of signaling cascades at low concentrations. The impacts of hormonal pollutants necessitate remediation solutions. Adsorption technologies are a favorable method of pollutant removal in research due to the ease of implementation, cost-effectiveness, and potential for environmental friendliness. Biologically derived adsorbent materials offer additional potential benefits of employing properties of biological materials, improving biocompatibility, and valorizing biomass. Hydrogels, biomass, and biochar are some of the most environmentally friendly adsorbents in pollution remediation research and there is a sizable base of publications detailing promising results of these materials. Thus, a review of recent publications of hydrogels, biomass, and biochar applied to adsorb estrogens, the largest class of steroid hormones, will allow their findings to be compared. Estrone (E1), estradiol (E2), estriol (E3), and ethinylestradiol (EE2) were focused on in literature alongside other less-researched hormones including prednisolone, progesterone, hydrocortisone, and dexamethasone. Removal efficiencies of E1, E2, EE2, and E3 by hydrogels ranged from 10 % to 93 %, removal efficiencies of E2 and EE2 with biomasses reached up to 99 % with tree bark, and biochar adsorption peaked in capacity of 233 mg/g of EE2 when synthesized from spent mushroom substrate.

人们日益关注人为因素对环境的影响，因此环境污染和水质研究日益增多，这些研究表明，污染物普遍具有浓度低、政府监管少的特点。药物是新兴污染物污染的一个重要子类别，包括天然和合成化合物。类固醇是一类显著的药物污染物，因为它们具有高结合亲和力，并能在低浓度下激活信号级联。由于激素类污染物的影响，有必要采取补救措施。由于吸附技术易于实施、成本效益高且具有环境友好的潜力，因此是研究中去除污染物的有利方法。生物衍生吸附材料还具有利用生物材料特性、提高生物兼容性和生物质价值等潜在优势。水凝胶、生物质和生物炭是污染修复研究中最环保的吸附剂，有大量出版物详细介绍了这些材料的良好效果。因此，对近期发表的有关水凝胶、生物质和生物炭用于吸附雌激素（最大的一类类固醇激素）的文章进行回顾，可以对它们的研究结果进行比较。雌酮 (E1)、雌二醇 (E2)、雌三醇 (E3) 和炔雌醇 (EE2) 与其他研究较少的激素（包括泼尼松龙、孕酮、氢化可的松和地塞米松）一起在文献中受到关注。水凝胶对 E1、E2、EE2 和 E3 的去除率从 10 % 到 93 % 不等；生物质对树皮中 E2 和 EE2 的去除率高达 99 %；用废蘑菇基质合成的生物炭对 EE2 的吸附量最高，达到 233 毫克/克。

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引用次数: 0

Silicalite-1 zeolite enables graphitic carbon nitride high selectivity toward CO2 photoreduction

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115004

Xiaohang Yang , Xingbo Bian , Panxin Wang , Huiyan Wang , Qiuju Qi

Carbon monoxide (CO) constitutes a pivotal chemical feedstock, extensively applied in diverse industrial processes such as the Fischer–Tropsch synthesis and the water-gas shift reaction, among others, underscoring its significant role in the chemical industry. Photocatalytic CO₂ reduction to produce CO provides an appealing route to consume useless greenhouse gases to valuable chemical feedstock. Regarding the poor selectivity of photocatalytic CO₂ conversion and the separation complexity for mixed products, integrating zeolite with semiconductor photocatalyst is first presented to achieve highly selective CO₂ photoreduction. Herein, silicalite-1 zeolite with high surface area and excellent CO₂ affinity is selected to construct a graphitic carbon nitride/silicalite-1 (CN/S-1) composite via a facile thermal polymerization procedure. The introduced S-1 zeolite enables extended visible light response, enhanced CO₂ adsorption, promoted separation and transportation of photoexcited charge carriers for the as-synthesized CN/S-1 composite. The resulting CN/S-1 composite shows significantly improved photocatalytic CO₂ reduction activity, yielding CO and CH₄ of 452.8 and 11.63 μmol·h⁻¹, respectively. The CO selectivity of the CN/S-1 composite achieves 97.5 %, which is maximal so far among the CN-based photocatalysts. In-situ Fourier transformed infrared (in-situ FTIR) spectra characterization reveals the composite prefer to dissociate COOH* to CO upon the incorporation of S-1 zeolite rather than protonation into hydrogenation products.

一氧化碳（CO）是一种重要的化学原料，广泛应用于各种工业流程，如费托合成和水气变换反应等，凸显了其在化学工业中的重要作用。光催化二氧化碳还原生成一氧化碳为将无用的温室气体转化为有价值的化学原料提供了一条极具吸引力的途径。考虑到光催化二氧化碳转化的选择性较差以及混合产物分离的复杂性，首次提出了将沸石与半导体光催化剂相结合以实现高选择性二氧化碳光还原的方法。本文选择了具有高比表面积和优异二氧化碳亲和性的硅铝酸盐-1沸石，通过简便的热聚合过程构建了氮化石墨碳/硅铝酸盐-1（CN/S-1）复合材料。引入的 S-1 沸石能够延长可见光响应时间、增强二氧化碳吸附能力、促进光激发电荷载流子在 CN/S-1 复合材料中的分离和传输。所制备的 CN/S-1 复合材料显著提高了光催化还原 CO2 的活性，产生的 CO 和 CH4 分别为 452.8 μmol-h-1 和 11.63 μmol-h-1。CN/S-1 复合材料的 CO 选择性达到了 97.5%，是迄今为止基于 CN 的光催化剂中最高的。原位傅立叶变换红外光谱表征显示，在加入 S-1 沸石后，复合材料更倾向于将 COOH* 分解为 CO，而不是质子化为氢化产物。

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引用次数: 0

Improved activity and coking-resistance of Fe2O3/ZrO2 catalysts by hydrothermal synthesis in propane dehydrogenation with CO2: Experimental, DFT calculations, and deactivation modeling

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115002

Hossein Mohammadzadeh, Ahmad Shariati, Mohammadreza Khosravi-Nikou, Ali Zahedinejad

In this work, two ZrO₂-supported Fe₂O₃ catalysts were synthesized through the impregnation (Fe₂O₃/t-ZrO₂) and the hydrothermal (Fe₂O₃/c-ZrO₂) methods. The hydrothermal preparation improved the catalyst activity and propylene yield; propane conversion: 45.8 % vs. 31.2 %, propylene yield: 31.1 % vs. 23.2 %. This higher activity was attributed to the high specific surface area and thereby higher Fe dispersion that led to more formation of active Fe^3 + sites. According to results, the t-ZrO₂ surfaces were known to be more favorable for coke reaction compared to c-ZrO₂. Adsorption energy of propane and propylene onto the most stable surfaces of ZrO₂ was measured as a criterion for side reactions and coke deposits by DFT calculations. The results showed that propane and propylene are more adsorbed onto t-ZrO₂ than onto c-ZrO₂, which indicates more cracking of propane and propylene onto t-ZrO₂. Finally, the experimental data were successfully fitted with the Deactivation Model with Residual Activity (DMRA). It was found that the Fe₂O₃/c-ZrO₂ catalyst has a higher resistance against the deactivation by coke deposits compared to the Fe₂O₃/t-ZrO₂ catalyst; activation energy of deactivation function: 83.64 vs. 70.09 kJ/mole.

本研究通过浸渍法（Fe2O3/t-ZrO2）和水热法（Fe2O3/c-ZrO2）合成了两种 ZrO2 支持的 Fe2O3 催化剂。水热制备法提高了催化剂活性和丙烯产率；丙烷转化率为 45.8 % 对 31.8 %：丙烷转化率：45.8% 对 31.2%，丙烯收率：31.1% 对 23.2%。较高的活性归因于较高的比表面积和较高的铁分散度，从而形成了更多的活性 Fe3 + 位点。结果表明，与 c-ZrO2 相比，t-ZrO2 表面更有利于焦炭反应。通过 DFT 计算测量了丙烷和丙烯在 ZrO2 最稳定表面上的吸附能，以此作为副反应和焦炭沉积的标准。结果表明，丙烷和丙烯在 t-ZrO2 上的吸附量比在 c-ZrO2 上的吸附量大，这表明丙烷和丙烯在 t-ZrO2 上的裂解量更大。最后，实验数据成功地与具有残余活性的失活模型（DMRA）进行了拟合。结果发现，与 Fe2O3/t-ZrO2 催化剂相比，Fe2O3/c-ZrO2 催化剂具有更强的抗焦炭沉积失活能力；失活函数活化能：83.64 对 70.09 kJ/mole。

{"title":"Improved activity and coking-resistance of Fe2O3/ZrO2 catalysts by hydrothermal synthesis in propane dehydrogenation with CO2: Experimental, DFT calculations, and deactivation modeling","authors":"Hossein Mohammadzadeh, Ahmad Shariati, Mohammadreza Khosravi-Nikou, Ali Zahedinejad","doi":"10.1016/j.jece.2024.115002","DOIUrl":"10.1016/j.jece.2024.115002","url":null,"abstract":"<div><div>In this work, two ZrO<sub>2</sub>-supported Fe<sub>2</sub>O<sub>3</sub> catalysts were synthesized through the impregnation (Fe<sub>2</sub>O<sub>3</sub>/t-ZrO<sub>2</sub>) and the hydrothermal (Fe<sub>2</sub>O<sub>3</sub>/c-ZrO<sub>2</sub>) methods. The hydrothermal preparation improved the catalyst activity and propylene yield; propane conversion: 45.8 % vs. 31.2 %, propylene yield: 31.1 % vs. 23.2 %. This higher activity was attributed to the high specific surface area and thereby higher Fe dispersion that led to more formation of active Fe<sup>3 +</sup> sites. According to results, the t-ZrO<sub>2</sub> surfaces were known to be more favorable for coke reaction compared to c-ZrO<sub>2</sub>. Adsorption energy of propane and propylene onto the most stable surfaces of ZrO<sub>2</sub> was measured as a criterion for side reactions and coke deposits by DFT calculations. The results showed that propane and propylene are more adsorbed onto t-ZrO<sub>2</sub> than onto c-ZrO<sub>2</sub>, which indicates more cracking of propane and propylene onto t-ZrO<sub>2</sub>. Finally, the experimental data were successfully fitted with the Deactivation Model with Residual Activity (DMRA). It was found that the Fe<sub>2</sub>O<sub>3</sub>/c-ZrO<sub>2</sub> catalyst has a higher resistance against the deactivation by coke deposits compared to the Fe<sub>2</sub>O<sub>3</sub>/t-ZrO<sub>2</sub> catalyst; activation energy of deactivation function: 83.64 vs. 70.09 kJ/mole.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 115002"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Continuous electrophoretic separation of submicron-microplastics from freshwater

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115010

Jui-Yen Lin , Cuijuan Feng , Ingyu Lee , Hyunook Kim , Chin-Pao Huang

Anthropogenic and natural weathering processes have produced submicron microplastics (MPs), an emerging contaminant. Due to small size, the treatment of submicron plastics particles by membrane processes requires small cutoff membranes, which necessitates great pressure gradient and suffers from clogging. The present study aims to develop an electrophoretic separation system for the separation of negatively charged submicron plastics particles from water. An electric field was supplied to produce an electrostatic force to counter the drag force in the permeation stream, thereby, preventing submicron plastics particles from entering the permeate. The critical electric field (E_c) for complete particles removal was estimated based on the dilute-to-influent flow rate ratio (q_d), zeta potential, and size of submicron plastics particles. The result showed that at steady-state, particle removal could reach 99 % at E > E_c at q_d = 0.5. The distribution of plastics particles during electrophoretic separation was analyzed considering electrophoresis and particle deposition. The particle removal efficiency can be modelled by hydraulic condition and critical electric field. Finally, the engineering aspects such as long-term operation, electrode degradation and influence of coexisted constituents were evaluated. The operation cost of electrophoretic separation was calculated to be USD 0.48/m³, which is cost-effective at small scales compared to conventional membrane processes.

人为和自然风化过程产生了亚微米级的微塑料（MPs），这是一种新出现的污染物。由于亚微米级塑料颗粒的尺寸较小，用膜法处理时需要使用小的截流膜，这就需要很大的压力梯度，而且会造成堵塞。本研究旨在开发一种电泳分离系统，用于从水中分离带负电的亚微米塑料颗粒。通过提供电场产生静电力来抵消渗透流中的阻力，从而防止亚微米塑料颗粒进入渗透液。根据稀释液与流入液的流速比 (qd)、zeta 电位和亚微米塑料微粒的大小，估算了完全去除微粒的临界电场 (Ec)。结果表明，在稳定状态下，当 E > Ec 为 qd = 0.5 时，颗粒去除率可达 99%。考虑到电泳和颗粒沉积，对电泳分离过程中塑料颗粒的分布进行了分析。颗粒去除效率可通过水力条件和临界电场来模拟。最后，对长期运行、电极退化和共存成分的影响等工程方面进行了评估。经计算，电泳分离的运行成本为 0.48 美元/立方米，与传统的膜过程相比，在小规模上具有成本效益。

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引用次数: 0

Per- and poly fluorinated substances: The poison in our waters – A call to action for India's aquatic future

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115114

Sivasai Puttamreddy , Shiam Babu Ramesh , Narasamma Nippatlapalli , Shaik Mahamad Allabakshi

In recent years, there has been a surge in environmental concerns stemming from per- and polyfluorinated substances, which are a diverse group of chemicals posing potential risks to human health and the environment, prompting global attention. Experts worldwide have convened to critically assess emerging data on these substances, encompassing their chemistry, fate, transport, exposure, and toxicity. Notably, perfluorooctanoic acid and perfluorosulfonic acid are amongst the most prevalent forms, prompting health advisories in various countries, including the United States of America, Germany, and other European nations. More than ∼5000 PFAS are used in the market for various applications. However, comprehensive data essential for both prospective and retrospective risk assessments remain lacking for most of these substances, with no regulatory standards established for these substances, leaving the extent of human exposure in India uncertain. Also, recent studies show that short- and long-chain PFAS have polluted major Indian rivers like the Ganges, Yamuna, Cauvery, and Krishna. This review consolidates research on per- and polyfluorinated substances (PFAS) in India, including their occurrence, sources, and concentrations. It highlights uncertainties in regulatory policies and proposes strategies to address gaps and assess health risks. Recommendations include enhancing monitoring programs, developing regulatory guidelines, and advancing treatment technologies, with a focus on integrating conventional and innovative methods through interdisciplinary approaches.

{"title":"Per- and poly fluorinated substances: The poison in our waters – A call to action for India's aquatic future","authors":"Sivasai Puttamreddy , Shiam Babu Ramesh , Narasamma Nippatlapalli , Shaik Mahamad Allabakshi","doi":"10.1016/j.jece.2024.115114","DOIUrl":"10.1016/j.jece.2024.115114","url":null,"abstract":"<div><div>In recent years, there has been a surge in environmental concerns stemming from per- and polyfluorinated substances, which are a diverse group of chemicals posing potential risks to human health and the environment, prompting global attention. Experts worldwide have convened to critically assess emerging data on these substances, encompassing their chemistry, fate, transport, exposure, and toxicity. Notably, perfluorooctanoic acid and perfluorosulfonic acid are amongst the most prevalent forms, prompting health advisories in various countries, including the United States of America, Germany, and other European nations. More than ∼5000 PFAS are used in the market for various applications. However, comprehensive data essential for both prospective and retrospective risk assessments remain lacking for most of these substances, with no regulatory standards established for these substances, leaving the extent of human exposure in India uncertain. Also, recent studies show that short- and long-chain PFAS have polluted major Indian rivers like the Ganges, Yamuna, Cauvery, and Krishna. This review consolidates research on per- and polyfluorinated substances (PFAS) in India, including their occurrence, sources, and concentrations. It highlights uncertainties in regulatory policies and proposes strategies to address gaps and assess health risks. Recommendations include enhancing monitoring programs, developing regulatory guidelines, and advancing treatment technologies, with a focus on integrating conventional and innovative methods through interdisciplinary approaches.</div></div>","PeriodicalId":15759,"journal":{"name":"Journal of Environmental Chemical Engineering","volume":"13 1","pages":"Article 115114"},"PeriodicalIF":7.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Anammox sludge granulation and synergy with comammox: A critical review

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115300

Rui Zhao, Xiaonong Zhang, Da Jin, Xurui Zhu, Luomiao Ji, Bo Gao, Peng Wu

Anaerobic ammonia oxidation (anammox) is regarded as a particularly promising process in the field of biological nitrogen removal. However, when treating municipal wastewater, whose water quality is inherently low in ammonia and nitrogen, which is not conducive to nitrite accumulation, the low dissolved oxygen operation tends to result in a deterioration of sludge settling performance in the activated sludge system. This can even lead to problems such as sludge swelling and sludge loss. In contrast, anammox with sludge granulation has the potential to address this issue. Furthermore, complete ammonia oxidation (comammox) bacteria are well adapted to flourish in environments with low ammonia nitrogen and low dissolved oxygen levels. It is anticipated that they will coexist in a mutually beneficial relationship with short-range denitrifying microorganisms and anammox microorganisms. This synergy has the effect of inhibiting the growth of nitrite-oxidising bacteria (NOB), which in turn leads to the accumulation of nitrite. Consequently, this approach offers a novel method for the conventional removal of nitrogen in municipal wastewater treatment. This paper will focus on the granulation of anammox sludge, reviewing the research progress on its bacterial characteristics and formation mechanism and extracellular polymer properties. It will then proceed to provide a systematic description of the distribution and physiological properties of comammox bacteria, before finally analysing the feasibility of the coupling of anammox and comammox, which provides a theoretical guarantee for the granulation of anammox sludge and the coupling of the comammox process.

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引用次数: 0

An environmentally friendly and highly efficient PBS composite membrane prepared by TiO2 hybridization and PDA surface coating

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115033

Yanhong Ji , Xiaodie Liu , Xi Liu , Quan Li , Zunbo Han , Hang Zhao , Zixing Zhou , Hanyu Shi , Benqiao He

The biodegradable membrane, due to its intrinsic biodegradable properties, has been recognized as a sustainable material with environmental benefits. However, it faces challenges related to poor mechanical strength and insufficient permeation separation performance. In this work, poly (butylene succinate) (PBS)/TiO₂/polydopamine (PDA) composite membrane has been fabricated through TiO₂ hybridization and PDA surface coating. As the duration of dopamine coating increases, the membrane displays a reduction in pore size, a narrower pore distribution, and a slight decrease in overall porosity. The tensile strength of the composite membrane is increased to 4.1 ± 0.3 MPa, which is about 3.8 times greater than that of the pure PBS membrane. Moreover, the contact angle of the membrane surface decreases to 28.7°, indicating a notable improvement in hydrophilicity. After coating with 2 g/L dopamine for 6 h, the PBS/TiO₂/PDA composite membrane achieves a maximum pure water flux of 152.4 L·m⁻²·h⁻¹ and a bovine serum albumin (BSA) rejection rate of 94.3 %. After experiencing two instances of BSA contamination, the pure water flux remains higher than that of the PBS/TiO₂ hybrid membrane. Furthermore, the PBS/TiO₂/PDA composite membrane exhibits notable long-term stability and is capable of degradation in the lipase degradation solution post-service. The environmentally friendly and highly efficient PBS/TiO₂/PDA composite membrane presented in this study offers theoretical framework and practical assistance for the development and utilization of biodegradable membranes.

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引用次数: 0

Super-fast and highly efficient extraction of uranium from water by a surface-acidified hydroxyapatite

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering

Pub Date : 2025-02-01 DOI: 10.1016/j.jece.2024.115018

Jiayi Li , Yuxin Liu , Zihao Ye , Hangxi Liu , Xiaoli Tan , Ming Fang

The elimination of U(VI) from acidic nuclear wastewater is important for solving the problems in environmental and energy fields. However, the adsorbents used for U(VI) extraction/removal usually undergo the issues of high cost, low efficiency, and long adsorption time. In this work, surface-acidified hydroxyapatite (SAHAP) powders were obtained by soaking chicken leg bone in acetic acid combined with hydrothermal treatment, which shows super fast removal/extraction capacity of U(VI) from the solution. The surface of the SAHAP is highly acidified by large quantities of hydrogen phosphate radicals. The characterization and mechanistic investigations indicate that the U(VI) substitute with Ca²⁺/H⁺ via an ion-exchange related monolayer chemisorption process. At room temperature, over 99 % of U(VI) could be sequestrated by SAHAP within 20 s at pH 4.0, and the extraction amount could reach 1270 mg/g. Moreover, the SAHAP shows great application potential in the removal/extraction of U(VI) from seawater, and 25 mM CO₃^2- ions could only reduce the adsorption ability by 4.18 % at pH 4.0. This study provides a new approach to fabricating adsorbents for highly effective, selective and low-cost extraction of U(VI) from wastewater.

消除酸性核能废水中的六（铀）对解决环境和能源领域的问题非常重要。然而，用于萃取/去除铀(VI)的吸附剂通常存在成本高、效率低、吸附时间长等问题。在这项研究中，通过将鸡腿骨浸泡在醋酸中并进行水热处理，得到了表面酸化羟基磷灰石（SAHAP）粉末，这种粉末对溶液中的六（U）元素具有超快的去除/萃取能力。SAHAP 的表面被大量磷酸氢自由基高度酸化。表征和机理研究表明，U(VI)通过与离子交换相关的单层化学吸附过程与 Ca2+/H+ 发生置换。室温下，在 pH 值为 4.0 的条件下，SAHAP 可在 20 秒内吸附 99% 以上的六价铬，萃取量可达 1270 mg/g。此外，SAHAP 在去除/萃取海水中的六氟化铀方面具有很大的应用潜力，在 pH 值为 4.0 时，25 mM CO32- 离子仅能降低 4.18% 的吸附能力。这项研究为制造高效、选择性和低成本萃取废水中的六价铀的吸附剂提供了一种新方法。

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引用次数: 0