Separation and Purification Technology最新文献_第8页

Enhancing dewaterability and purification of waste engineering slurry by environmentally friendly bio-based flocculant

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-09 DOI: 10.1016/j.seppur.2025.132906

Man Xue , Mengjia Liang , Yanping Shi , Jihua Cai , Xianyu Yang , Chunzheng Jin , Zexin Chen , Maoyan Xu

Flocculation is widely used to enhance the dewatering efficiency of waste slurry. However, traditional flocculants have poor biodegradability and secondary pollution problems. Bio-based flocculants are promising due to their non-toxicity and biodegradability. In this study, a novel bio-based flocculant (PGR) derived from waste pomelo peel was successfully synthesized by TEMPO-mediated oxidation and acrylamide/N, N-Dimethylacrylamide grafting. The effect of PGR dosage on the flocculation performance of waste slurry and the adsorption performance of Pb(Ⅱ) and Cd(Ⅱ) was investigated. Results showed that the presence of PGR significantly enhanced the flocculation efficiency of waste slurry. The slurry dehydration rate and moisture content of mud cake reached approximately 30 % and 67.1 %, respectively. The turbidity of supernatant was minimized at 3.76 NTU with PGR concentration of 12 g/L. Batch adsorption experiments highlighted the effectiveness of PGR in adsorbing and removing Pb(Ⅱ) and Cd(Ⅱ) from contaminated slurry. The maximum removal efficiencies of Pb(Ⅱ) and Cd(Ⅱ) were 97 % and 55.3 %, respectively. The environmental assessment indicated that PGR solution is non-toxic. the EC₅₀ of PGR solution was 1.44 × 10⁵ ppm. Adding a small amount of nutrient soil, the slurry or mud cakes could be directly used to cultivate grass. Characterization methods revealed that the abundant pore structures and functional groups of PGR contributed to excellent flocculation and absorption capacity for waste slurry. Adsorption and chain bridging are the main mechanisms of slurry dewatering and ion adsorption. The use of bio-based flocculant in slurry treatment reduces environmental pollution, while simultaneously achieving the sustainable goal of “waste-treating-waste”.

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引用次数: 0

Chemically and physically dual Cross-Linked phosphorylated cellulose hydrogel for uranium removal from aqueous solution

IF 8.6 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-09 DOI: 10.1016/j.seppur.2025.132907

Nan Zhang, Wenze Li, Jinfeng Li, Qianwen Wang, Baochang Li, Jianwei Zhang, Tao Zhang, Zhigang Li, Yaorui Li, Bo Tian, Hongtao Zhao

Cellulose-based hydrogel materials have emerged as a highly promising candidate for the adsorption and removal of uranium from aqueous solutions. However, the subpar mechanical properties of cellulose hydrogels pose a significant obstacle to their practical implementation. In this study, a radiation-induced graft polymerization (RIGP) technique is employed to fabricate the hydrogel matrix, and subsequently, a phosphorylated modified cellulose-based hydrogel (PTCH) uranium adsorbent is synthesized through a one-step phytic acid modification process. Micro-Raman imaging is utilized to meticulously characterize and analyze the distribution and density of cross-linking domains within the hydrogel network. The findings reveal that the modified PTCH boasted both a loose chemical cross-linking network and a compact physical cross-linking network formed by hydrogen bond reconstruction, leading to a remarkable enhancement in its mechanical properties. It exhibits a compressive strength of up to 0.13 MPa and a strain of 49.20 %. Concurrently, the U(VI) adsorption performance of the hydrogel is investigated. The synergistic complexation effect of phosphate and carboxyl groups on U(VI) substantially augment the adsorption capacity of the hydrogel, with a theoretical maximum adsorption capacity for U(VI) reaching 449.5 mg·g⁻¹. In summary, PTCH effectively overcomes the limitations of traditional cellulose-based adsorbent materials, presenting a novel avenue for the development of cost-effective and efficient uranium adsorbents.

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引用次数: 0

Exploring Bayesian methods in chromatographic development: Increasing the capacity of the mRNA affinity ligand

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132881

Sara Sousa Rosa , Davide Nunes , Julian Grinsted , Duarte M.F. Prazeres , Ana M. Azevedo , Daniel G. Bracewell , Marco P.C. Marques

Enabling the full potential of a new therapeutic modality requires the development of a flexible and cost-effective manufacturing platform. A critical bottleneck in this process is the development of robust purification platform, usually reliant on sequential chromatography steps. Development of chromatographic steps is a laborious and costly task, as it is dependent of multiple iterations. Evaluating multiple parameters in a traditional methodology can lead to an exponential number of experiments. To overcome this, we propose the use of Bayesian optimisation to efficiently navigate the solution space.

Using the development of mRNA affinity chromatography as a model, Bayesian optimization was used to enhance the dynamic binding capacity. This approach led to a 7.5-fold increase in capacity (1.8 mgRNA mL^-1) relatively to the benchmark run in only 13 iterations. Additionally, model interpretability techniques were used to correlate predictions with the experimental results, while gaining process knowledge. Bayesian optimisation is a powerful and efficient tool for chromatography development, and in combination with model interpretability techniques, can have a real impact on process development using a QbD framework, and with potentially be used for automation and broader application in bioprocessing.

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引用次数: 0

Recovery of quinoa protein via ultrasound-assisted extraction and nanoparticle-enhanced foam fractionation: stabilizer preparation, mechanistic insights and process optimization

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132935

Nan Hu , Jiaqi Li , Yazhu Pei , Yaoxi Chen , Yingjie Du , Linlin Ding , Yanfei Li

This study presents an innovative, sustainable strategy for high-efficiency recovery of quinoa protein through synergistic integration of ultrasonic extraction and foam fractionation stabilized by sodium caprate-functionalized cellulose nanoparticles (SC-CNPs). The surface engineering of CNPs via SC modification was systematically characterized using SEM-EDX, FTIR, XPS, and zeta potential analysis, revealing successful grafting of aliphatic chains that transformed CNPs into amphiphilic stabilizers with optimal interfacial activity (contact angle: 79.7°). This modification extended foam half-life by 26.7-fold compared to unmodified CNPs, enabling robust foam stability for protein recovery. Through Box-Behnken design optimization (150 mg/L SC-CNPs, pH 4.8, 530 mL/min gas flow), the process achieved exceptional recovery efficiency (93.1 %) and enrichment ratio (15.9). Compositional profiling confirmed the preservation of native quinoa protein structures, with better functional properties. Nutritionally, the protein met FAO/WHO essential amino acid requirements, validating its suitability for food fortification, cosmetic emulsions, and pharmaceutical encapsulation. By bridging colloidal science, green chemistry, and circular bioeconomy principles, this work establishes nanoparticle-enhanced foam fractionation as a paradigm-shifting technology for sustainable valorization of plant proteins, offering transformative solutions for global food security and eco-friendly biorefining.

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引用次数: 0

Concentrated-degradation “reactor” for in-situ tetrabromobisphenol A removal based on the precise design of pollution/photocatalyst micro-interface

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132939

Silong Wang , Zesen Shang , Jin Xu , Li Xiong , Chengzhuo Yu , Fanglan Geng , Huasheng Wu , Jitao Lv , Lixia Zhao , Yawei Wang , Guibin Jiang

Concentration-degradation is an effective strategy for removing emerging pollutants at low concentrations, yet the design of the contaminant/catalyst micro-interface remains a challenge. In this work, tetrabromobisphenol A (TBBPA) as a model pollutant, a precise micro-interface based on ZrO₂/ZnIn₂S₄ hollow microspheres were designed to construct a concentration-degradation “reactor” for removing low concentrations of pollutants in water. The ZrO₂/ZnIn₂S₄ achieved efficient photocatalytic degradation (92.95 %) of TBBPA with excellent adsorption capacity (289.05 mg g⁻¹). The experimental results and DFT calculation indicated that a surface electric field was developed with special interfacial interactions of hydroxyl/Zr and Br/S vacancies, which facilitated the attack of h⁺ on the TBBPA to achieve rapid separation of photogenerated carriers. In the presence of e^-, h⁺, ·OH, and ·O₂^–, the TBBPA was converted to small molecules by debromination, hydroxyl substitution, and beta-scission pathways. This work provides novel insights into the adsorption and degradation of pollutants from an interfacial perspective and presents the potential solution for the removal of trace emerging pollutants.

浓度降解是去除低浓度新兴污染物的有效策略，但污染物/催化剂微界面的设计仍是一项挑战。本研究以四溴双酚 A（TBBPA）为模型污染物，设计了一种基于 ZrO2/ZnIn2S4 空心微球的精确微界面，构建了一个浓度降解 "反应器"，用于去除水中的低浓度污染物。ZrO2/ZnIn2S4 实现了对四溴双酚 A 的高效光催化降解（92.95%），并具有优异的吸附能力（289.05 mg g-1）。实验结果和 DFT 计算表明，羟基/Zr 和 Br/S 空位的特殊界面相互作用形成了表面电场，促进了 h+ 对 TBBPA 的攻击，实现了光生载流子的快速分离。在 e-、h+、-OH 和 -O2- 的存在下，TBBPA 通过脱溴、羟基取代和β-分裂途径转化为小分子。这项工作从界面角度为污染物的吸附和降解提供了新的见解，并为去除痕量新兴污染物提供了潜在的解决方案。

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引用次数: 0

Separation and recovery of waste heat from millimeter-sized blast furnace slag in cyclone separators 在旋风分离器中分离和回收毫米级高炉矿渣中的余热

IF 8.6 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132908

Shiyun Li, Jianping Li, Yongli Xiao, Hongpeng Ma, Yang Chen, Xia Jiang, Hualin Wang

Achieving green and energy-efficient heat separation and mitigating thermal pollution from slag with the temperature exceeding 1500 °C and the global annual production of 857 million tons, remains a formidable challenge for the iron and steel industry. To address this issue, this work introduces an innovative approach by leveraging the distinct characteristics of high-speed particle self-rotation and revolution driven by the cyclone separator for slag heat separation. In contrast to the traditional air blast method, the average heat separation coefficient is increased by up to 25.1 %, along with a 30.0 % reduction in energy consumption. This enhancement can be attributed to the cyclone-induced high-speed particle self-rotation behavior, reaching up to 14,459 rpm. The heat separation efficiency of the cyclone separator for blast furnace slag reaches 94.6 %. Moreover, this approach has been applied in a 60 t/h commercial slag disposal project, achieving high-value slag with 100 % glassy content and generating 25,952 kg/h superheated steam. As a result, 706.3 kg CO₂ emissions are reduced, surpassing the state-of-the-art centrifugal granulation technology (31.2 kg CO₂ emissions) per ten tonnes slag processed. Benefiting from the utilization of cyclone separator, an annual reduction of 420,712 GJ in waste thermal emissions has been achieved. This work paves a novel pathway for the green and energy-efficient separation and recovery of heat from the high-temperature slag for the iron and steel industry.

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引用次数: 0

Engineering of 2D/2D CoAl-LDH/Bi2MoO6 S-scheme heterojunction nanoflake films for efficient CO2 photoreduction to CO with high selectivity

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132885

Jiajia Zhang, Yajie Chen, Lu Liu, Jinyu Bao, Fanze Zeng, Wenpeng Li, Guohui Tian

Photocatalytically converting CO₂ into renewable fuels or valuable carbon-containing compounds is an effective strategy to ease greenhouse effect and energy crisis. But practical application of powdered catalysts was limited due to their poor recovery. Herein, two-dimensional/two-dimensional (2D/2D) CoAl layered double hydroxides (CoAl-LDH) (CoAl-LDH)/Bi₂MoO₆ S-scheme heterojunction films were synthesized as efficient, visible light-active, and recyclable composite thin-film photocatalysts through two successive liquid phase reactions. The Bi₂MoO₆ nanoflake film was first prepared on fluorine-doped tin oxide (FTO) glass by a solvothermal method, and then the CoAl-LDH nanoflake film was grown on its surface by hydrothermal process. The resulting CoAl-LDH/Bi₂MoO₆ S-scheme heterojunction films offer superior body-plane and interfacial charge transfer capabilities, efficient collection and enrichment of CO₂ molecules, and increased visible light harvesting. There exist short charge transport distance and large interfacial contact area between CoAl-LDH and Bi₂MoO₆ films. As a result, the optimized CoAl-LDH/Bi₂MoO₆ S-scheme heterojunction film achieved a CO yield of 131.1 μmol h⁻¹ m⁻² with nearly 100 % selectivity, which was much higher than those of the control samples. This work provides a valuable approach to developing efficient heterostructure films for photocatalytic applications.

{"title":"Engineering of 2D/2D CoAl-LDH/Bi2MoO6 S-scheme heterojunction nanoflake films for efficient CO2 photoreduction to CO with high selectivity","authors":"Jiajia Zhang, Yajie Chen, Lu Liu, Jinyu Bao, Fanze Zeng, Wenpeng Li, Guohui Tian","doi":"10.1016/j.seppur.2025.132885","DOIUrl":"10.1016/j.seppur.2025.132885","url":null,"abstract":"<div><div>Photocatalytically converting CO<sub>2</sub> into renewable fuels or valuable carbon-containing compounds is an effective strategy to ease greenhouse effect and energy crisis. But practical application of powdered catalysts was limited due to their poor recovery. Herein, two-dimensional/two-dimensional (2D/2D) CoAl layered double hydroxides (CoAl-LDH) (CoAl-LDH)/Bi<sub>2</sub>MoO<sub>6</sub> S-scheme heterojunction films were synthesized as efficient, visible light-active, and recyclable composite thin-film photocatalysts through two successive liquid phase reactions. The Bi<sub>2</sub>MoO<sub>6</sub> nanoflake film was first prepared on fluorine-doped tin oxide (FTO) glass by a solvothermal method, and then the CoAl-LDH nanoflake film was grown on its surface by hydrothermal process. The resulting CoAl-LDH/Bi<sub>2</sub>MoO<sub>6</sub> S-scheme heterojunction films offer superior body-plane and interfacial charge transfer capabilities, efficient collection and enrichment of CO<sub>2</sub> molecules, and increased visible light harvesting. There exist short charge transport distance and large interfacial contact area between CoAl-LDH and Bi<sub>2</sub>MoO<sub>6</sub> films. As a result, the optimized CoAl-LDH/Bi<sub>2</sub>MoO<sub>6</sub> S-scheme heterojunction film achieved a CO yield of 131.1 μmol h<sup>−1</sup> m<sup>−2</sup> with nearly 100 % selectivity, which was much higher than those of the control samples. This work provides a valuable approach to developing efficient heterostructure films for photocatalytic applications.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"367 ","pages":"Article 132885"},"PeriodicalIF":8.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143798535","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

Crystal OH boosting piezocatalytic H2O2 synthesis by Bi3O(PO4)2OH from pure water for atrazine degradation

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132786

Qintian Peng , Hailin Tian , Houle Zhou , Li Wang , Huibin Niu , Ruiping Li , Yee Wen Teh , Yingping Huang , Haiyang Shi , Chuncheng Chen , Liqun Ye

Water oxidation reaction (WOR) is the key to achieving highly efficient H₂O₂ production but remains challenging, due to its poor selectivity, low activity, and unfavorable thermodynamics. Herein, a novel Bi₃O(PO₄)₂OH (BOHP) microcrystal was successfully synthesized for the first time using deep eutectic solvents and employed as a piezocatalyst for H₂O₂ production. Interestingly, under ultrasonication (80 W, 40 kHz), the BOHP can split pure H₂O into H₂O₂ with an exceptionally high generation rate of 639.11 μmol·g⁻¹·h⁻¹ without additional sacrificial agents. Mechanism studies demonstrate that the hydroxyl (–OH) groups in BOHP facilitate hydrophilicity, promoting water molecule activation and transformation while enhancing the piezoelectric response, thereby accelerating charge carrier separation. Additionally, the BOHP also exhibits efficient piezocatalytic degradation of atrazine (ATZ) by decomposing H₂O₂ in situ into active ·OH radicals, achieving remarkable decrease of the toxicity under ultrasonic vibration. This work provides deeper insights into photocatalytic materials in piezoelectric catalysis and advances the development of efficient piezoelectric catalysts for environmental applications.

{"title":"Crystal OH boosting piezocatalytic H2O2 synthesis by Bi3O(PO4)2OH from pure water for atrazine degradation","authors":"Qintian Peng , Hailin Tian , Houle Zhou , Li Wang , Huibin Niu , Ruiping Li , Yee Wen Teh , Yingping Huang , Haiyang Shi , Chuncheng Chen , Liqun Ye","doi":"10.1016/j.seppur.2025.132786","DOIUrl":"10.1016/j.seppur.2025.132786","url":null,"abstract":"<div><div>Water oxidation reaction (WOR) is the key to achieving highly efficient H<sub>2</sub>O<sub>2</sub> production but remains challenging, due to its poor selectivity, low activity, and unfavorable thermodynamics. Herein, a novel Bi<sub>3</sub>O(PO<sub>4</sub>)<sub>2</sub>OH (BOHP) microcrystal was successfully synthesized for the first time using deep eutectic solvents and employed as a piezocatalyst for H<sub>2</sub>O<sub>2</sub> production. Interestingly, under ultrasonication (80 W, 40 kHz), the BOHP can split pure H<sub>2</sub>O into H<sub>2</sub>O<sub>2</sub> with an exceptionally high generation rate of 639.11 μmol·g<sup>−1</sup>·h<sup>−1</sup> without additional sacrificial agents. Mechanism studies demonstrate that the hydroxyl (–OH) groups in BOHP facilitate hydrophilicity, promoting water molecule activation and transformation while enhancing the piezoelectric response, thereby accelerating charge carrier separation. Additionally, the BOHP also exhibits efficient piezocatalytic degradation of atrazine (ATZ) by decomposing H<sub>2</sub>O<sub>2</sub> in situ into active <strong>·</strong>OH radicals, achieving remarkable decrease of the toxicity under ultrasonic vibration. This work provides deeper insights into photocatalytic materials in piezoelectric catalysis and advances the development of efficient piezoelectric catalysts for environmental applications.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"367 ","pages":"Article 132786"},"PeriodicalIF":8.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143798544","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

Green extraction of pure aluminum from coarse AlSiCu alloys via centrifugal separation under isothermal semi-solid conditions: A novel upcycling strategy

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132920

Bolin Sun, Lei Guo, Zhe Wang, Xi Lan, Zhancheng Guo

The aluminum industry is facing a “dead metal” crisis, primarily due to the unsustainable aluminum cycle. With the rapid rise of electric vehicles, the demand for cast aluminum has gradually failed to support the continued accumulation of “down-cycling” of aluminum scraps, at which point the upcycling of low-grade aluminum has become a new challenge to solve the crisis. To this end, this paper introduces a new technique which combines semi-solid isothermal treatment with centrifugal separation to directly extract industrial-grade pure aluminum from coarse AlSiCu alloys. This method is a new upgrading strategy that does not involve secondary pollution. Firstly, excess precipitated impurities were removed from the melt by centrifugal filtration, where the impurity phases accumulated at grain boundaries. Subsequently, under centrifugal force, the removal of dissolved elements was promoted by controlling the liquefaction and separation of intergranular phases during isothermal treatment, and ultimately high-purity aluminum with Al content up to 99.4 wt% was successfully obtained after secondary purification. In addition, more high-value refined silicon was easily extracted from the filtrates. Based on this, an efficient recycling process was designed, achieving an extraction efficiency of over 92% for metallic Al. Given its promising application prospects in recycled aluminum industry, this process is expected to be a more economical and green option for solving “dead metal” crisis in the future.

{"title":"Green extraction of pure aluminum from coarse AlSiCu alloys via centrifugal separation under isothermal semi-solid conditions: A novel upcycling strategy","authors":"Bolin Sun, Lei Guo, Zhe Wang, Xi Lan, Zhancheng Guo","doi":"10.1016/j.seppur.2025.132920","DOIUrl":"10.1016/j.seppur.2025.132920","url":null,"abstract":"<div><div>The aluminum industry is facing a “dead metal” crisis, primarily due to the unsustainable aluminum cycle. With the rapid rise of electric vehicles, the demand for cast aluminum has gradually failed to support the continued accumulation of “down-cycling” of aluminum scraps, at which point the upcycling of low-grade aluminum has become a new challenge to solve the crisis. To this end, this paper introduces a new technique which combines semi-solid isothermal treatment with centrifugal separation to directly extract industrial-grade pure aluminum from coarse AlSiCu alloys. This method is a new upgrading strategy that does not involve secondary pollution. Firstly, excess precipitated impurities were removed from the melt by centrifugal filtration, where the impurity phases accumulated at grain boundaries. Subsequently, under centrifugal force, the removal of dissolved elements was promoted by controlling the liquefaction and separation of intergranular phases during isothermal treatment, and ultimately high-purity aluminum with Al content up to 99.4 wt% was successfully obtained after secondary purification. In addition, more high-value refined silicon was easily extracted from the filtrates. Based on this, an efficient recycling process was designed, achieving an extraction efficiency of over 92% for metallic Al. Given its promising application prospects in recycled aluminum industry, this process is expected to be a more economical and green option for solving “dead metal” crisis in the future.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"367 ","pages":"Article 132920"},"PeriodicalIF":8.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143798509","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

Demulsification performance of oil-in-water emulsions utilizing bidirectional pulse electric field and fiber media

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology

Pub Date : 2025-04-08 DOI: 10.1016/j.seppur.2025.132923

Xuan Bai , Yuntao Liu , Yong Kang

The method of utilizing a bidirectional pulsed electric field (BPEF) coupled with fiber aggregation has proven effective for demulsifying oil-in-water (O/W) emulsions. Nevertheless, the interaction between oil droplets and fibers in coupled fields has not been sufficiently investigated. This article innovatively combines BPEF with filament fibers. It employs COMSOL software to numerically simulate the migration, aggregation, and adhesion of emulsified oil droplets influenced by both fluid–structure interaction (FSI) and electric fields. The effectiveness of this combined demulsification method was validated through laboratory experiments. Numerical simulation results indicate that hydrophilic aggregated fibers facilitate oil droplets aggregation, while non-uniform electric fields accelerate the colliding and migration of the oil droplets. Analysis of simulation results revealed the demulsification mechanism, demonstrating that oil droplets migrate and aggregate into larger droplets in the combined operation of electrical forces and FSI fields. Fibers reduce the migration distance of oil droplets, diminishing their hardness at the oil–water contact in the novel integrated electric field. Experimental results show that, under the 0.5 % filling rate of viscose fiber, and electric field of 400 V, 50 Hz and 30 % duty cycle, the oil content can be reduced from 4500 mg/L to 5.3 mg/L, achieving a 3.22 NTU turbidity and a demulsification efficiency of 99.88 %. The theoretical characterization and procedure enhancement of electrochemical demulsification for removing oil would greatly benefit from this work.

{"title":"Demulsification performance of oil-in-water emulsions utilizing bidirectional pulse electric field and fiber media","authors":"Xuan Bai , Yuntao Liu , Yong Kang","doi":"10.1016/j.seppur.2025.132923","DOIUrl":"10.1016/j.seppur.2025.132923","url":null,"abstract":"<div><div>The method of utilizing a bidirectional pulsed electric field (BPEF) coupled with fiber aggregation has proven effective for demulsifying oil-in-water (O/W) emulsions. Nevertheless, the interaction between oil droplets and fibers in coupled fields has not been sufficiently investigated. This article innovatively combines BPEF with filament fibers. It employs COMSOL software to numerically simulate the migration, aggregation, and adhesion of emulsified oil droplets influenced by both fluid–structure interaction (FSI) and electric fields. The effectiveness of this combined demulsification method was validated through laboratory experiments. Numerical simulation results indicate that hydrophilic aggregated fibers facilitate oil droplets aggregation, while non-uniform electric fields accelerate the colliding and migration of the oil droplets. Analysis of simulation results revealed the demulsification mechanism, demonstrating that oil droplets migrate and aggregate into larger droplets in the combined operation of electrical forces and FSI fields. Fibers reduce the migration distance of oil droplets, diminishing their hardness at the oil–water contact in the novel integrated electric field. Experimental results show that, under the 0.5 % filling rate of viscose fiber, and electric field of 400 V, 50 Hz and 30 % duty cycle, the oil content can be reduced from 4500 mg/L to 5.3 mg/L, achieving a 3.22 NTU turbidity and a demulsification efficiency of 99.88 %. The theoretical characterization and procedure enhancement of electrochemical demulsification for removing oil would greatly benefit from this work.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"367 ","pages":"Article 132923"},"PeriodicalIF":8.1,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143798499","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