Journal of Membrane Science最新文献

{"title":"Evaluation of power generation characteristics of reverse electrodialysis using ion exchange membranes with a novel concavo–convex structure","authors":"Minato Higa ,&nbsp;Suzuka Morinaga ,&nbsp;Ryo Ujike ,&nbsp;Hiroki Kawasaki ,&nbsp;Kaito Okamoto ,&nbsp;Yuji Takaoka ,&nbsp;Yu Sugimoto ,&nbsp;Mitsuru Higa","doi":"10.1016/j.memsci.2025.124689","DOIUrl":"10.1016/j.memsci.2025.124689","url":null,"abstract":"<div><div>In recent years, salinity gradient energy (SGE), generated by mixing two salt solutions of different concentrations has gained increasing attention as a renewable energy source. Reverse electrodialysis (RED) uses ion exchange membranes to convert SGE into electrical energy. Enhancing RED power output requires reducing electrical resistance in the low-concentration side-flow channels of the RED stack. This can be achieved using profiled (PF) membranes with convex structures formed on the membrane surfaces. In this study, a novel PF membrane with a convex structure, termed ORIGAMI PF membrane, was fabricated from a single flat membrane forming convex structures keeping the membrane thickness unaffected unlike conventional PF membranes. In power generation tests using NaCl solutions with conductivities of 50 mS/cm and 0.3 mS/cm, the stack constructed with this PF membrane demonstrated a power density of 1.44 W/m², which was 48 % higher than that of the flat membrane stack. In addition, at a linear velocity of 1 cm/s, the PF membrane stack exhibited a 18 % lower pressure drop than the flat membrane stack; hence, net power density of the PF membrane was 1.24 W/m², and 70 % higher than that of the flat one. When high-concentration NaCl solutions with conductivities of 95 mS/cm and 185 mS/cm were used as the high-concentration feed solutions, the PF membrane stack achieved maximum gross power densities of 2.10 W/m² and 2.54 W/m², respectively, demonstrating a 48 % and 33 % increase, respectively, compared to the flat membrane stack under the same conditions. These results demonstrate that the developed PF membrane exhibits superior RED power generation performance compared to flat membranes, even under high-salinity conditions.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124689"},"PeriodicalIF":9.0,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109160","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}

{"title":"Zwitterionic triethanolamine-grafted nanofiltration membranes for sustainable antibiotic recovery","authors":"Feidong Yang ,&nbsp;Yanyan Liu ,&nbsp;Chuang Li ,&nbsp;Shuzhen Zhao ,&nbsp;Shuai Jiang ,&nbsp;Mengyang Hu ,&nbsp;Pengfei Zhang ,&nbsp;Liheng Dai ,&nbsp;Kecheng Guan ,&nbsp;Hideto Matsuyama","doi":"10.1016/j.memsci.2025.124684","DOIUrl":"10.1016/j.memsci.2025.124684","url":null,"abstract":"<div><div>With the increasing emphasis on sustainable development, membrane technology has extended from wastewater treatment to the recovery of high-value bioproducts (e.g., antibiotics), offering a high-efficiency, low-energy alternative to conventional solvent extraction and crystallization. In this work, we grafted zwitterionic triethanolamine (ZTEA) on the polyamide (PA) to construct a PA-polyester nanofiltration membrane (PA-ZTEA) for efficient antibiotic recovery. The zwitterionic structure increased membrane hydrophilicity and enlarged pore size. The modified PA-ZTEA membrane demonstrated approximately twice the pure water permeance (20.3 L m⁻² h⁻¹ bar⁻¹) compared to the pristine PA membrane while maintaining over 98 % erythromycin (ERY) rejection. The optimal membrane exhibited outstanding NaCl/ERY separation factor (58.4), while it achieved an ERY concentration factor of 2.95 in the continuous operation in a simulated fermentation broth, significantly outperforming the pristine PA membrane (1.63). Moreover, the PA-ZTEA membrane exhibited exceptional antifouling properties against proteins, polysaccharides, and surfactants (e.g., 94.0 % sodium dodecyl sulfate flux recovery ratio versus 84.5 % for the PA control), owing to its hydration layer that inhibited foulant adsorption. This work establishes an effective strategy for enhancing antibiotic recovery from fermentation broths, addressing key challenges in desalination efficiency.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124684"},"PeriodicalIF":9.0,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109159","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}

{"title":"Tailoring linker defects in MOF-808 to improve CO2 separation in mixed matrix membranes","authors":"Po-Chun Wu ,&nbsp;Ho Jun Lee ,&nbsp;Yi-Fan Lin ,&nbsp;Kuo-Lun Tung ,&nbsp;Jong Suk Lee ,&nbsp;Dun-Yen Kang","doi":"10.1016/j.memsci.2025.124688","DOIUrl":"10.1016/j.memsci.2025.124688","url":null,"abstract":"<div><div>Carbon capture is widely recognized as a pivotal technology for alleviating the accelerating impacts of global warming. Mixed matrix membranes (MMMs) that embed metal organic frameworks (MOFs) offer a compelling route to high-performance separations, and MOF-808 stands out among them because of its outstanding chemical stability and environmentally friendly synthesis. In this study, the defect density of MOF-808 was tuned by varying the formic acid modulator: Higher modulator loading produced MOF-808 with higher linker defect density. After synthesis, MOF-808 was washed with either water or ethanol and then incorporated into PEBAX matrix through a drying-free process that ensured uniform dispersion. Washing with ethanol altered the pore coordination environment of MOF-808, partially replacing formate with ethoxide. Introducing an appropriate amount of formic acid created additional open metal sites and increased both CO₂ permeability and CO₂/N₂ selectivity; however, excessive formic acid produced too many defects, causing severe pore blockage and consequently lowering the CO₂ permeability. The drying-free method, by preventing MOF aggregation and ensuring homogeneous dispersion, led to a 38 % increase in CO₂/N₂ selectivity compared with the conventional drying method. The ethoxide substitution induced by ethanol washing occupied part of the pore volume, leading to a reduction in CO₂ permeability. The optimized MOF-808/PEBAX MMM achieved a CO₂ permeability of 150 Barrer and a CO₂/N₂ selectivity of 76.4, both markedly higher than those of the pristine polymer. These results highlight a sustainable, scalable strategy for producing high-efficiency membranes for post-combustion CO₂ capture.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124688"},"PeriodicalIF":9.0,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155234","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}

{"title":"Supramolecular pseudo-nanophase separation enables ion transport parity with conventional membranes","authors":"Wenjing Ye ,&nbsp;Sisi Xiao ,&nbsp;Jiahui Yuan,&nbsp;Sangshan Peng,&nbsp;Qing He","doi":"10.1016/j.memsci.2025.124706","DOIUrl":"10.1016/j.memsci.2025.124706","url":null,"abstract":"<div><div>Supramolecular-engineered pseudo-nanophase separation offers a compelling strategy for fabricating ion-conducting membranes with industrial scalability while maintaining rapid ion transport and chemical robustness. However, fundamental distinctions between pseudo-nanophase separation and its conventional counterpart remain poorly understood. We engineered ion-conducting membranes featuring snowflake-like multi-branched hydrophilic sidechains through covalent and supramolecular grafting, inducing conventional versus pseudo-nanophase separation. Comparative analysis revealed both architectures form analogous 4–11 nm hydrophilic domains (∼7 nm median) through hydrophobic/hydrophilic segregation. Though conventional domains contain tethered sidechains versus sulfuric acid solutions in pseudo-separated counterparts, the membranes demonstrate comparable area resistances (0.25 vs 0.24 Ω cm²) and vanadium permeabilities (1.1 vs 1.3 <span><math><mrow><mo>×</mo></mrow></math></span> 10⁻⁹ m² s⁻¹), leading to indistinguishable efficiencies and cycling stability in vanadium redox flow batteries. The observed functional equivalence, wherein proton transfer kinetics and vanadium-ion exclusion are largely insensitive to the molecular constitution of the engineered nanochannels, challenges conventional membrane design paradigms emphasizing covalent architectures for optimal ion selectivity. This finding advances the mechanistic understanding of nanochannel-mediated ion transport and substantiates the high credibility and efficiency of the pseudo-nanophase separation strategy.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124706"},"PeriodicalIF":9.0,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106211","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}

{"title":"Tailoring MnO2 nanodomains in organic-inorganic hybrid interfaces toward tunable hydrocarbon separation","authors":"Jihoon Choi ,&nbsp;Woong-Chul Shin ,&nbsp;Hyeokjun Seo ,&nbsp;Huiryung Heo ,&nbsp;Min-Jun Jang ,&nbsp;Dong-Yeun Koh","doi":"10.1016/j.memsci.2025.124615","DOIUrl":"10.1016/j.memsci.2025.124615","url":null,"abstract":"<div><div>Organic solvent nanofiltration offers an energy-saving alternative to distillation for hydrocarbon fractionation. Here, we introduce a simple and scalable method for fabricating novel organic-inorganic hybrid membranes from polybenzimidazole (PBI) and manganese oxide (MnO₂), designed for the separation of complex hydrocarbons. Homogeneously integrated MnO₂ domains, formed via oxidative interaction with imidazole moieties within the PBI matrix, create a rigid hybrid structure with enhanced molecular selectivity. By systematically tuning PBI concentration, KMnO₄ dosage, and reaction time, we achieved membranes with low molecular weight cut-off (MWCO) as low as 266 g mol⁻¹. Notably, these membranes surpassed the reported upper bound for toluene/1,3,5-triisopropylbenzene separation and demonstrated effective fractionation of complex hydrocarbon mixtures, such as naphtha, enriching the lighter fractions. This study clarifies the role of KMnO₄ in PBI modification: rather than inducing direct N–N crosslinking as previously suggested, it facilitates the <em>in situ</em> generation of crystalline MnO₂ domains that bolster membrane rigidity and molecular selectivity. These findings underscore the potential of hybrid PBI membranes as a practical platform for membrane-assisted crude oil fractionation and offer prospects for advanced energy-efficient separation strategies.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124615"},"PeriodicalIF":9.0,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106573","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}

{"title":"Process synthesis and optimization based on multi-stage membrane superstructure for helium extraction from natural gas","authors":"Hao Zhang ,&nbsp;Wu Xiao ,&nbsp;Andi Cheng ,&nbsp;Huijun Yi ,&nbsp;Huajian Zong ,&nbsp;Yuxin Ban ,&nbsp;Xuehua Ruan ,&nbsp;Xiaobin Jiang ,&nbsp;Gaohong He","doi":"10.1016/j.memsci.2025.124701","DOIUrl":"10.1016/j.memsci.2025.124701","url":null,"abstract":"<div><div>In the traditional design method based on the experience of a hybrid multi-stage membrane process in helium extraction from natural gas, it is difficult to ensure synchronous optimization of processes and parameters owing to complex configurations and interdependent parameter relationships. In this study, a novel superstructure is proposed for the optimal synthesis of a multi-stage membrane process. A comprehensive mixed-integer nonlinear programming (MINLP) mathematical model was developed. More feasible process structures were included in this model, and both process parameters and structures could be optimized simultaneously. The particle swarm optimization algorithm was employed to minimize the separation cost and systematically identify the optimal number of membrane stages, membrane areas, interstage pressures, and recirculation stream locations. To enhance the simulation accuracy and simplify the model complexity, Python interfacing with UniSim Design via ActiveX was employed to facilitate the acquisition of calculation data and process condition configuration. First, the ability to obtain optimal process configurations was validated through comparison with a reference case in this field. Subsequently, the model was applied to helium extraction in a natural gas plant. The optimal process configurations and operating variables were determined for the different recovery rates and purities. Additionally, the optimal process configurations and operating variables were also solved for different helium feed concentrations (700–9000 ppm). The model validation results show that the applied model solution reduces the separation cost by 18.2 %, which proves that the application of this model can enhance the economic efficiency of membrane separation technology for helium extraction from natural gas.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124701"},"PeriodicalIF":9.0,"publicationDate":"2025-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109163","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}

{"title":"Constructing re-entrant superhydrophobic structures on membrane surface for robust anti-wetting membrane distillation","authors":"Bowen Li ,&nbsp;Pengfei Zhang ,&nbsp;Ralph Rolly Gonzales ,&nbsp;Zhan Li ,&nbsp;Shuzhen Zhao ,&nbsp;Zhaohuan Mai ,&nbsp;Kecheng Guan ,&nbsp;Mengyang Hu ,&nbsp;Liheng Dai ,&nbsp;Yanyan Liu ,&nbsp;Yuqing Lin ,&nbsp;Tomohisa Yoshioka ,&nbsp;Hideto Matsuyama","doi":"10.1016/j.memsci.2025.124704","DOIUrl":"10.1016/j.memsci.2025.124704","url":null,"abstract":"<div><div>The practical application of membrane distillation (MD) remains limited by membrane wetting and scaling, particularly in the presence of low surface tension contaminants and inorganic scalants. The traditional fluorination modification method of hydrophobic membrane surface fluorination only realizes the chemical modification and then improves the anti-wetting and anti-scaling performances, but it is difficult to maximize the effect by constructing the secondary structure of fluorinated material. In this study, we introduce an interfacial phase separation method to create pure fluoropolymer (AF2400) structure on the surface of hierarchical polyvinylidene fluoride (PVDF) membranes. The optimal AF2400 layer features thin and porous structure generating a secondary re-entrant. The modified membranes exhibited enhanced resistance to both wetting and scaling, maintaining stable MD operation for 16 h with a 0.6 mM sodium dodecyl sulfate (SDS) solution as feed and for 30 h with a mixed foulant feed solution containing 0.2 mM SDS and 20 mM gypsum. The synergistic effect of hierarchical morphology and engineered surface chemistry contributed to improved membrane robustness and long-term performance. These results highlight a scalable and effective approach to fabricating advanced MD membranes with robust anti-wetting and anti-scaling performance.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124704"},"PeriodicalIF":9.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106166","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}

{"title":"Efficient separation of bismuth(III) by tertiary amine-functionalized polymeric membranes in electrodialysis","authors":"Baoying Wang,&nbsp;Zhenzhen Cui,&nbsp;Ruirui Li,&nbsp;Zihao Wang,&nbsp;Weicheng Fu,&nbsp;Junying Yan,&nbsp;Chenxiao Jiang,&nbsp;Liang Wu,&nbsp;Yaoming Wang,&nbsp;Tongwen Xu","doi":"10.1016/j.memsci.2025.124700","DOIUrl":"10.1016/j.memsci.2025.124700","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Efficient separation of technology-critical bismuth from diverse waste streams and mineral processing is of high significance. However, Bi(III) coexists with various metal ions that have similar physicochemical properties, making its selective recovery challenging. Herein, tertiary amine-functionalized polymeric membranes with prominent bismuth separation performance are fabricated using a solvent casting pore-filling method. The excellent compatibility between the trioctylamine and polymer chains facilitates the construction of continuous ion channels, thereby enabling highly efficient and selective separation of Bi(III) during electrodialysis. The fabricated membrane achieve a great Bi(III) flux of 131.0 × 10&lt;sup&gt;−2&lt;/sup&gt; mmol m&lt;sup&gt;−2&lt;/sup&gt; h&lt;sup&gt;−1&lt;/sup&gt; and ultrahigh perm-selectivity values (i.e., &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; = 483.9, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; = 40499.7, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mi&gt;o&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; = 27663.1, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;F&lt;/mi&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; = 378.3, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; = 819.1, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; = 2014.9, and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mi&gt;l&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;mi&gt;i&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mrow&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; = 505.6) in the presence of multiple metal ions, which is much superior to that of flagship commercial AGU. The good stability of the membrane d","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124700"},"PeriodicalIF":9.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060847","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}

{"title":"Volatile fatty acid selectivity during electrodialysis: effect of a competing counterion on volatile fatty acid transport mechanisms","authors":"Holly M. Haflich,&nbsp;Joshua W. Singleton,&nbsp;Orlando Coronell","doi":"10.1016/j.memsci.2025.124703","DOIUrl":"10.1016/j.memsci.2025.124703","url":null,"abstract":"<div><div>Volatile fatty acids (VFAs) are short-chain carboxylic acids with versatile applications that can be sustainably produced through anaerobic digestion. VFAs must be separated from anaerobic digestate for downstream use. Electrodialysis (ED) is an approach to selectively separate anionic VFAs from other ions, water, and neutral solutes. Towards enhancing selective VFA separation, VFA transport mechanisms during ED need to be understood. Accordingly, our objectives were to (i) determine the relative contributions of the partition and mobility selectivities to the permeability selectivity for VFA-containing counterion pairs, and (ii) determine the effect of a competing counterion on VFA transport mechanisms. To do this, we evaluated the permeability (P_i/P_j), partition (K_i/K_j), and mobility (u_i/u_j) selectivities of six VFA-containing counterion pairs, including VFA/VFA and VFA/Cl⁻ pairs, and a chloride (Cl⁻)/bromide (Br⁻) control under (i) mixed- and (ii) single-counterion conditions. Results showed the partition selectivity drove the permeability selectivity for Cl⁻/VFA and Cl⁻/Br⁻ pairs while the mobility selectivity drove the permeability selectivity for VFA/VFA pairs. Further, for the VFA/Cl⁻ and Cl⁻/Br⁻ pairs, we observed lower mixed-counterion partition selectivities and higher mixed-counterion mobility selectivities than corresponding single-counterion selectivities. Conversely, for the VFA/VFA pairs, we observed generally lower mixed-counterion partition <em>and</em> mobility selectivities than single-counterion selectivities. Overall, results indicate that VFA partitioning decreased by the presence of a counterion with greater affinity for the membrane while the effect of the competing counterion on VFA mobility depended on the competing counterion physicochemical properties. This work provides mechanistic insights into electro-driven VFA transport under conditions with competing counterions which is critical given the complexity of digestates. This study is the first to systematically evaluate VFA transport properties and selectivities in an AEM and provides a robust experimental framework for determining electro-driven counterion permeabilities under mixed-counterion conditions.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124703"},"PeriodicalIF":9.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106210","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}

{"title":"Stacking engineering of multilayer WS2/GO hybrid membranes for enhanced desalination performance: A molecular dynamics study","authors":"Shuang Wang ,&nbsp;Huali Long ,&nbsp;Fen Xing ,&nbsp;Libo Li ,&nbsp;Daohui Zhao","doi":"10.1016/j.memsci.2025.124702","DOIUrl":"10.1016/j.memsci.2025.124702","url":null,"abstract":"<div><div>The rapid development of two-dimensional (2D) hybrid membranes has provided new research avenues for membrane-based seawater desalination technologies. In this study, four types of three-layer stacked hybrid membrane structures were constructed by combining hydrophilic graphene oxide (GO) membranes with hydrophobic tungsten disulfide (WS₂) membranes, and the desalination mechanisms of these hybrid membranes were thoroughly investigated using molecular dynamics (MD) simulations. The results demonstrate that the configuration of edge atoms in the WS₂ membrane significantly influences its desalination performance: The W–S membrane exhibits the highest water permeance, while the S–S membrane shows the highest ion rejection rate. Based on these findings, four distinct hybrid membrane stacking configurations were designed. The simulation results reveal that the GO-S-GO configuration with an interlayer spacing of 9 Å demonstrates optimal overall performance, achieving a water permeance of 21.57 × 10² L/m²/h/bar with ion rejection rates of 100 % for Na⁺ and 98.1 % for Cl⁻. Furthermore, by reducing the oxidation degree of GO and optimizing the interlayer spacing, the water permeance can be enhanced without compromising the 100 % ion rejection rate. This study elucidates the influence of surface characteristics of WS₂/GO hybrid membranes on water permeation and ion transmembrane transport, providing critical theoretical guidance for the development of high-efficiency, energy-saving novel desalination membrane materials.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"736 ","pages":"Article 124702"},"PeriodicalIF":9.0,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057113","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}