Xuehui Ge , Jun Qian , Zhen Zhu , Yafei Cheng , Lei Yuan , Jinjie Jia , Xiaolei Liu , Hongwei Zhang , Xiaocheng Lin
{"title":"Toward tailored anion exchange membranes for high-performance electrocatalytic oxidation of HMF to FDCA","authors":"Xuehui Ge , Jun Qian , Zhen Zhu , Yafei Cheng , Lei Yuan , Jinjie Jia , Xiaolei Liu , Hongwei Zhang , Xiaocheng Lin","doi":"10.1016/j.memsci.2025.123810","DOIUrl":"10.1016/j.memsci.2025.123810","url":null,"abstract":"<div><div>Membrane separator that is highly ionic conductive and alkaline stable is essential for the efficient, scalable electrocatalytic oxidation of HMF to FDCA, a key process for sustainable development. Drawing inspiration from the microstructural design of Nafion, we developed a series of side-chain imidazolium-functionalized anion exchange membranes (AEMs), employing the chemically stable polyethersulfone (PES) as the base polymer. Functionalization of PES side chains with chloromethyl groups, followed by C2-substituted imidazolium modification, enabled precise tuning of the membrane's physicochemical properties and structural characteristics. This tailored approach yielded an optimized DIM-PES-1.0 AEM exhibiting complete HMF conversion, with 94.0 % selectivity for FDCA and 94.1 % Faradaic efficiency, outperforming the commercial Fumasep FAA-3-PK-130 AEM, which achieved only 85.5 % FDCA selectivity under similar conditions. Notably, the DIM-PES-1.0 AEM demonstrated high alkaline stability, substantially retaining its electrocatalytic activity across 15 cycles, in contrast to the rapid degradation observed in FAA-3-PK-130 AEM after only three cycles. Our findings showcase a scalable, efficient strategy for producing high-performance AEMs under mild conditions, highlighting their potential for advancing sustainable electrocatalytic processes.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123810"},"PeriodicalIF":8.4,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387990","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}
Ali Hayek , Abdulkarim Alsamah , Qasim Saleem , Rashed H. Alhajry , Abdulrahman A. Alsuwailem
{"title":"Enhanced H2S and CO2 selectivities through bromo-substitution of polyimide membranes for sour natural gas upgrading","authors":"Ali Hayek , Abdulkarim Alsamah , Qasim Saleem , Rashed H. Alhajry , Abdulrahman A. Alsuwailem","doi":"10.1016/j.memsci.2025.123807","DOIUrl":"10.1016/j.memsci.2025.123807","url":null,"abstract":"<div><div>Hydrogen sulfide (H<sub>2</sub>S) removal from sour natural gas streams <em>via</em> polymeric membranes is a challenging process. Membranes are prone to H<sub>2</sub>S-induced plasticization at high gas feed pressures which reduces their separation properties (<em>i.e.</em>, H<sub>2</sub>S/CH<sub>4</sub> selectivity). In this work, we report the preparation of CARDO(Br)-containing polyimides that form membranes with increased polarity due to the presence of bromo groups in their backbones. Gas separation performance was evaluated of membranes prepared from 6FDA-Durene/CARDO(Br) (1:1) copolyimide using a quinary gas mixture containing ∼20 mol.% H<sub>2</sub>S at a high gas feed pressure of 500 psia. Such conditions are of great importance to assess polymeric membrane performance since they mimic those encountered in industrial sour natural gas purification. The presence of the bromo groups [6FDA-Durene/CARDO(Br) (1:1) copolyimide] improved H<sub>2</sub>S/CH<sub>4</sub> and CO<sub>2</sub>/CH<sub>4</sub> selectivity coefficients by 42 % and 49 %, respectively, compared to its non-brominated [6FDA-Durene/CARDO (1:1)] copolyimide, while maintaining high H<sub>2</sub>S and CO<sub>2</sub> permeability coefficients. The findings from this work avail polymeric membranes with attractive performance for implementation in membrane-based sour natural gas upgrading applications.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123807"},"PeriodicalIF":8.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350198","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}
Ji Hoon Kim , Soon Hyeong So , Minsu Kim , Eunji Choi , Nahyeong Lee , Kiwon Eum , Yun Ho Kim , Dae Woo Kim
{"title":"ZIF-8/graphene nanoribbon hybrid nanoplates for mixed-matrix membranes with enhanced CO2 separation performance","authors":"Ji Hoon Kim , Soon Hyeong So , Minsu Kim , Eunji Choi , Nahyeong Lee , Kiwon Eum , Yun Ho Kim , Dae Woo Kim","doi":"10.1016/j.memsci.2025.123805","DOIUrl":"10.1016/j.memsci.2025.123805","url":null,"abstract":"<div><div>Pore-tuned metal-organic frameworks (MOFs) have been extensively utilized for the development of mixed matrix membranes (MMMs). In this study, we synthesized a ZIF-8/graphene oxide nanoribbon (GONR) hybrid nanoplate and incorporated it into 6FDA-DAM-type polyimide polymers. The process began with the shear-induced assembly of graphene oxide nanoribbons (GONRs) into high-aspect-ratio nanosheets by extruding GONR dispersions through a micro-gap channel. During the subsequent solvothermal synthesis of ZIF-8, ZIF-8 nanoparticles were grown and densely intergrown within the GONR nanosheets, resulting in hybrid nanoplates with a thickness of several hundred nanometers. The resulting MMMs, containing 5 wt% of the ZIF-8/GONR hybrid filler, exhibited significantly enhanced CO₂ separation performance. They achieved a CO₂ permeability of 639 Barrer, with ideal selectivities of 19.3 for CO₂/N₂ and 31 for CO₂/CH₄. Unlike conventional ZIF-8-based MMMs showing limited improvement in CO₂ separation due to the larger and flexible aperture size (∼4 Å) of ZIF-8, the enhanced CO₂ selectivity is attributed to the GONR-induced pore tuning of ZIF-8. This tuning effectively narrows the aperture size, hindering the permeation of larger molecules and improving CO₂ selective permeation.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"720 ","pages":"Article 123805"},"PeriodicalIF":8.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181631","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}
Guannan Ren , Genghao Gong , Ningrui Zhang , Zhou Xu , Huaizhu Liu , Yunxia Hu
{"title":"Polyamide interlayer supported organically bridged silica membrane for highly selective pervaporation dehydration of N-methyl pyrrolidone","authors":"Guannan Ren , Genghao Gong , Ningrui Zhang , Zhou Xu , Huaizhu Liu , Yunxia Hu","doi":"10.1016/j.memsci.2025.123779","DOIUrl":"10.1016/j.memsci.2025.123779","url":null,"abstract":"<div><div>Organically bridged hybrid silica, a promising material for energy-efficient molecular separation membranes, is typically prepared on costly ceramic substrates through complex and challenging fabrication processes. This work presents a novel approach for designing hybrid silica membranes by using an ultrathin polyamide (PA) film as the interlayer, replacing the traditional ceramic-based intermediate and transition layers. A flexible, triple-layer hybrid silica composite membrane was fabricated, consisting of an ethylene-bridged hybrid silica layer coated on a poly(ether-ether-ketone) (PEEK) ultrafiltration membrane with a PA interlayer, which was prepared via interfacial polymerization. The smooth, dense, and ultrathin PA interlayer provides favorable conditions for the high-quality deposition of the hybrid silica top layer. This membrane is applied in the pervaporation (PV) dehydration of the polar aprotic solvent N-methyl-2-pyrrolidone (NMP), demonstrating impressive NMP/water separation factor of over 10,000 and competitive permeation flux of ∼0.39 kg/(m<sup>2</sup> h). In addition, this membrane also demonstrates good solvent tolerance and thermal stability, maintaining stable separation performance during PV dehydration of NMP in a cyclic test lasting up to 50 h, with operating temperatures ranging from 40 to 80 °C. These results show the flexible hybrid silica composite membrane has strong potential for purifying and recovering high-purity NMP via PV dehydration process.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123779"},"PeriodicalIF":8.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387988","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}
Yafei Cheng , Huanhuan Zhang , Lei Yuan , Haiyang Shao , Xiaocheng Lin
{"title":"Sustainable synthesis of high-performance anion exchange membranes for electrodialysis desalination via photopolymerization","authors":"Yafei Cheng , Huanhuan Zhang , Lei Yuan , Haiyang Shao , Xiaocheng Lin","doi":"10.1016/j.memsci.2025.123813","DOIUrl":"10.1016/j.memsci.2025.123813","url":null,"abstract":"<div><div>Sustainable chemistry principles underscore the pivotal role of solvent-free processes in the fabrication of anion exchange membranes (AEMs). This study presents an eco-friendly, solvent-free approach for AEM preparation via photopolymerization, utilizing 4-vinylpyridine as the monomer and divinylbenzene as the crosslinking agent. The polymerization, conducted at ambient temperature and completed within 20 min, was followed by post-polymerization N-alkylation with ethyl bromide to introduce pyridinium groups. The precise modulation of crosslinking and N-alkylation levels enabled meticulous control over the membranes' intrinsic chemical properties and their functional effectiveness in electrodialysis desalination. The optimal membrane's area resistance was recorded at 1.09 Ω cm<sup>2</sup>, while its transport number reached 0.965, outperforming the commercial AMV AEM in desalination efficacy. This work underscores the promise of solvent-free photopolymerization as a sustainable, high-performance strategy for fabricating AEMs, providing substantial advancements in both environmental sustainability and electrodialysis desalination performance.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123813"},"PeriodicalIF":8.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378789","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}
Yanling Chen , Mingjie Wei , Ming Liu , Gan Liu , Lingchuan Li , Qingyuan Yang
{"title":"Mxene nanosheet membranes for hydrogen isotope separation: An investigation via multi-scale molecular simulations","authors":"Yanling Chen , Mingjie Wei , Ming Liu , Gan Liu , Lingchuan Li , Qingyuan Yang","doi":"10.1016/j.memsci.2025.123814","DOIUrl":"10.1016/j.memsci.2025.123814","url":null,"abstract":"<div><div>Effective separation of hydrogen isotopes holds significant importance for scientific research, energy production, and the medical field. However, a challenge remains due to the similarity in the physicochemical properties of hydrogen isotopes. Currently, the research of hydrogen isotopes separation based on environmentally friendly and sustainable membranes is still in the blank field. Because of significantly reducing and optimizing experimental workload, high-throughput screening calculations combined with non-equilibrium dynamics simulations become an important tool for evaluating the newly designed materials for membranes. Among them, two-dimensional MXene, which have uniform pore size distribution and high permeability, were expected to separate hydrogen isotopes by membrane process. However, the large amount of MXene types troubled the experimental researchers from screening the optimal MXene. Herein, Monte Carlo combined with equilibrium molecular dynamics simulations was initially used for large-scale calculation to screen out ideal membrane candidates from 730 types of MXenes. Then, non-equilibrium molecular dynamics simulations were carried out on these candidates to explore the transport properties of gases in membranes under near-industrial conditions. The research indicated that a 4 Å interlayer spacing facilitated the effective separation of hydrogen isotopes. Ti<sub>0.4</sub>Nb<sub>1.6</sub>C with the lowest diffusion resistance, exhibited D<sub>2</sub>/H<sub>2</sub> membrane selectivity that surpassed that of traditional processes. Therefore, it was recommended for further validation and application in experiments.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123814"},"PeriodicalIF":8.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143306861","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}
Yuhang Guo , Guangzhaoyao Yang , Shiyao Yu , Jing Huang , Fusheng Pan , Runnan Zhang , Haojun Fan , Zhongyi Jiang
{"title":"Engineering fluorinated COF-based hybrid membranes for efficient blood oxygenation","authors":"Yuhang Guo , Guangzhaoyao Yang , Shiyao Yu , Jing Huang , Fusheng Pan , Runnan Zhang , Haojun Fan , Zhongyi Jiang","doi":"10.1016/j.memsci.2025.123815","DOIUrl":"10.1016/j.memsci.2025.123815","url":null,"abstract":"<div><div>Poly (4-methyl-1-pentene) (PMP) is widely used between blood and gas in extracorporeal membrane oxygenation (ECMO). However, it is more suitable to miniaturize the oxygenator from an economic and biosafety standpoint, that necessitates the PMP oxygenation membrane with enhanced gas permeance and hemocompatibility. This study introduced fluorinated covalent organic framework (FCOF) nanofiber into PMP matrix to construct PMP-FCOF hybrid flat sheet membranes and hollow fiber membranes (HFMs) <em>via</em> thermally induced phase separation (TIPS). FCOF exhibits structural and chemical similarity with PMP, ensuring the good compatibility with PMP matrix. The abundant C–F bonds rendered membrane low-surface-energy of ∼30.2 mN m<sup>−1</sup> for PMP–FCOF–3 flat sheet membrane, exhibiting better hemocompatibility compared with that of ∼34.4 mN m<sup>−1</sup> for the PMP membrane. The fabricated PMP–FCOF–3 HFMs for blood gas exchange with O<sub>2</sub> exchange rate of ∼309.8 mL min<sup>−1</sup> m<sup>−2</sup>, which was 77.3 % higher than the commercial PMP HFM, and comparable CO<sub>2</sub> exchange rate of ∼251.7 mL min<sup>−1</sup> m<sup>−2</sup> with commercial PMP HFM. The blood-gas exchange and hemocompatibility were synergistically enhanced by a simple hybrid strategy, exhibiting great application potentials.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123815"},"PeriodicalIF":8.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350381","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":"High temperature resistant polyamide thin film composite nanofiltration membrane based on polyethylene substrate","authors":"Huizi Zheng Pang, Xiao-Gang Jin, Jiao Wang, Xiao-Hua Ma, Zhen-Liang Xu","doi":"10.1016/j.memsci.2025.123811","DOIUrl":"10.1016/j.memsci.2025.123811","url":null,"abstract":"<div><div>High temperature wastewater is difficult and dangerous to treat, and it is necessary to take appropriate methods for treatment and recycling. Membrane separation technology is a novel approach for treating high-temperature wastewater with many benefits of enhanced efficiency, reduced energy consumption, and ecological preservation. However, most polymer composite membranes struggle with separation performance at high temperatures. Herein, we have successfully prepared a thin-film composite (TFC) nanofiltration (NF) membrane that is resistant to high temperatures, based on polyethylene (PE) substrate. The hydrophobic PE substrate was modified by tannic acid/diethylenetriamine (TA/DETA) coating, and then PA/PE TFC membrane was fabricated by interfacial polymerization (IP). The optimized PA/PE-60 membrane presented outstanding high-temperature resistance and stability. When the temperature rose to 90 °C, the permeance increased to 32.9 L m<sup>−2</sup> h<sup>−1</sup> bar <sup>−1</sup>, and the Na<sub>2</sub>SO<sub>4</sub> rejection remained at 98.1 %. Overall, our work provides a method to prepare high temperature resistant NF membranes.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123811"},"PeriodicalIF":8.4,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143306858","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}
Maria Di Vincenzo , Alberto Tiraferri , Radoslaw Górecki , Anthony Martin , Karuppasamy Gopalsamy , Marco Malaguti , Bambar Davaasuren , Mohamed N. Hedhili , Shanshan Hong , Gyorgy Szekely , Dan Dumitrescu , Suzana P. Nunes
{"title":"2-Hydroxy-N-(diphenylmethyl) acetamide nanocomposite membranes for highly selective desalination","authors":"Maria Di Vincenzo , Alberto Tiraferri , Radoslaw Górecki , Anthony Martin , Karuppasamy Gopalsamy , Marco Malaguti , Bambar Davaasuren , Mohamed N. Hedhili , Shanshan Hong , Gyorgy Szekely , Dan Dumitrescu , Suzana P. Nunes","doi":"10.1016/j.memsci.2025.123785","DOIUrl":"10.1016/j.memsci.2025.123785","url":null,"abstract":"<div><div>Reverse osmosis membranes were developed by incorporating self-assembled 2-hydroxy-N-(diphenylmethyl)acetamide channels as part of a polyamide matrix via an industrially scalable interfacial polycondensation procedure. High-resolution electron microscopy revealed uniformly dispersed nanochannels (∼3 Å diameter) at loadings of up to ∼30 vol% within the selective layer, while X-ray analyses confirmed the preservation of crystalline supramolecular assembled structure. The membranes have high water transport and selectivity for small neutral solutes such as urea and boron. In cross-flow brackish water desalination (2000 ppm NaCl at 15 bar), the optimized membranes exhibited a water flux of ∼30 L m<sup>−2</sup> h<sup>−1</sup>, a 350 % increase over those without the incorporated assemblies, while maintaining >99.3 % observed NaCl rejection. Urea removal tests (15,000 ppm feed at 20 bar) reached rejections of up to 75–80 %, outperforming commercial seawater membranes (64 % rejection) with 280 % higher flux. For a higher salinity feed (5800 ppm NaCl at 20 bar), the developed membranes had ∼99.3 % NaCl and 70–78 % boron rejections over a pH range of 6–9, surpassing commercial brackish membranes. Under seawater conditions (32,000 ppm NaCl at 55 bar), the membranes provided ∼99.3–99.6 % salt rejection at fluxes up to 35 L m<sup>−2</sup> h<sup>−1</sup> with single-pass boron rejections above 90 %, producing potentially potable water with <500 mg/L salinity and boron levels <460 μg/L. Overall, the membranes deliver high water transport and Å-scale solute selectivity. Molecular dynamics simulations support the formation of hydrogen-bonded, sponge-like channel networks, elucidating the strong water-channel interactions responsible for the observed improvements in desalination performance.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"721 ","pages":"Article 123785"},"PeriodicalIF":8.4,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350154","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":"Prediction of membrane flux in membrane bioreactors through dimensionless analysis and correlations","authors":"Meilan Liu , Baoqiang Liao","doi":"10.1016/j.memsci.2024.123589","DOIUrl":"10.1016/j.memsci.2024.123589","url":null,"abstract":"<div><div>Membrane flux (J, m<sup>3</sup>/m<sup>2</sup>·s) is a key design and operation parameter of membrane bioreactor (MBR) wastewater treatment plants. In this study, the impact of mixed liquor properties (mixed liquor density (ρ, kg/m<sup>3</sup>), mixed liquor dynamic viscosity (μ<sub>s</sub>, kg/m.s)), hydrodynamic conditions (mixed liquor cross-flow velocity V<sub>m</sub> in tubular MBRs or air-mixed liquor two-phase cross-low velocity V<sub>am</sub> in the riser zone of the filtration tank of submerged MBRs, generalized as V (m/s)), <em>trans</em>-membrane pressure ΔP (Pa), membrane module geometry (tubular membrane channel diameter (D<sub>t</sub>) or the hydraulic diameter (D<sub>s</sub>) of the submerged bioreactor filtration riser zone, generalized as D (m)), and membrane filtration characteristics (total membrane filtration resistance (R<sub>t,</sub> 1/m)) on membrane flux J in MBRs was analyzed and investigated using the dimensionless analysis and correlation approach. Four dimensionless groups, the ratio of membrane flux J to mixed liquor or air-mixed liquor generalized cross-flow velocity V (J/V), Reynolds number of mixed liquor (ρVD/μ<sub>s</sub>), Euler number of mixed liquor (ΔP/(ρV<sup>2</sup>), and a new dimensionless group, fouling number of mixed liquor, (μ<sub>s</sub>R<sub>t</sub>/(ρV)), were derived to correlate the impact of these parameters on membrane flux J in MBRs as seen in Equation (i):<span><span><span>(i)</span><span>J/V = m(ρVD/μ<sub>s</sub>)<sup>a</sup> (ΔP/(ρV<sup>2</sup>))<sup>b</sup> (μ<sub>s</sub>R<sub>t</sub>/(ρV))<sup>c</sup></span></span></span></div><div>Based on experimental data of MBRs from the literature, the coefficients (m, a, b, c) in Equation (i) were calibrated. The J/V values predicted using Equation (i) are in reasonably good agreement with the experimental J/V values from the literature with a typical relative error smaller than 20 % in most cases. Sensitivity analysis showed that <em>trans</em>-membrane pressure, ΔP, and total membrane filtration resistance, R<sub>t</sub>, are the two most important parameters affecting the prediction of the derived dimensionless correlations (J/V) for both side-stream tubular MBRs and submerged MBRs. These new dimensionless group correlations provide a new mathematical tool for representing in-depth insights of how mixed liquor properties, hydrodynamic conditions, membrane module geometry, and total membrane filtration characteristics affect membrane flux J in MBRs. They can then be used to predict the membrane performance and to guide the optimal design and operation of MBR plants.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"717 ","pages":"Article 123589"},"PeriodicalIF":8.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155057","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}