Journal of Membrane Science Letters最新文献_第5页

Single‐step polyelectrolyte complex coating on hollow fibers yields nanofiltration or biocatalytic properties 单步聚电解质复合涂层在中空纤维上产生纳滤或生物催化性能

Journal of Membrane Science Letters Pub Date : 2023-05-01 DOI: 10.1016/j.memlet.2023.100039

Maria A. Restrepo , Johannes Kamp , Lasse Guericke , Robin Schnichels , Hannah Roth , Matthias Wessling

{"title":"Single‐step polyelectrolyte complex coating on hollow fibers yields nanofiltration or biocatalytic properties","authors":"Maria A. Restrepo , Johannes Kamp , Lasse Guericke , Robin Schnichels , Hannah Roth , Matthias Wessling","doi":"10.1016/j.memlet.2023.100039","DOIUrl":"https://doi.org/10.1016/j.memlet.2023.100039","url":null,"abstract":"<div><p>The modification of membranes with polyelectrolytes via the Layer-by-Layer (LBL) method has become state of the art in recent years. It is used to fabricate nanofiltration hollow fiber membranes or to immobilize biomolecules on a membrane surface. However, it still remains a time consuming process. In contrast, this work explores a single-step membrane modification with coating solutions containing both polyanions and polycations. High salt concentration in the coating solution suppresses the complexation of the polyelectrolytes prior to the coating. Then, the controlled reduction of the salt concentration during the coating triggers the formation of a polyelectrolyte complex layer on the membrane. Three coating methods are proposed: (1) In interfacial complexation (IC), the polyelectrolyte solution coats the membrane and is subsequently precipitated by flushing with water. (2) Diffusive desalination (DDS) uses the concentration difference between the coating solution in the lumen and a water stream in the shell side to remove salt ions continuously. (3) In polyelectrolyte concentration (PC), the polyelectrolyte solution is coated at a constant flux. Here, the membrane retains the polyelectrolyte while ions permeate through. First, we evaluate the coating methods regarding their ability to produce nanofiltration membranes, which varies depending on the coating method used. With PC, membranes with up to 79% MgCl<sub>2</sub> rejection and a permeability of 30 LMH/bar are obtained. Moreover, in-situ functionalization of the membranes is investigated by the addition of enzymes. Here, with DDS enzymes are immobilized, mostly achieved through adsorption via electrostatic interactions.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49735050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanistic insights into the role of nanoparticles towards the enhanced performance of thin-film nanocomposite membranes 纳米颗粒对增强薄膜纳米复合膜性能的作用机理

Journal of Membrane Science Letters Pub Date : 2023-05-01 DOI: 10.1016/j.memlet.2023.100046

Fengxia Yang , Fuyi Cui , Yi Di Yuan , Xin Yu , Dan Zhao

{"title":"Mechanistic insights into the role of nanoparticles towards the enhanced performance of thin-film nanocomposite membranes","authors":"Fengxia Yang , Fuyi Cui , Yi Di Yuan , Xin Yu , Dan Zhao","doi":"10.1016/j.memlet.2023.100046","DOIUrl":"https://doi.org/10.1016/j.memlet.2023.100046","url":null,"abstract":"<div><p>Thin-film nanocomposite (TFN) membranes are promising in improving water treatment due to their high permeability and selectivity. However, little is known about the mechanism by which nanoparticles enhance their performance. In this study, we prepared two series of TFN membranes containing ∼40 nm-sized zeolitic imidazolate framework (ZIF-8) nanoparticles, one with a hydrophobic porous form and the other with a nonporous amorphous form (aZIF-8). The TFN membranes containing 0.15 w/v% ZIF-8 exhibited a 100% increase in water permeance while maintaining a similar NaCl rejection (98.38%) compared to thin-film composite (TFC) membranes used in brackish water reverse osmosis (BWRO). In contrast, adding the same amount of aZIF-8 resulted in almost no water permeance enhancement. By comparing the physicochemical properties of the two materials and the two series of membranes, we found that the only difference was the presence or absence of internal hydrophobic pore structures. We proposed that the hydrophobic internal pores of nanoparticles served as extra water channels while preventing the passage of NaCl during BWRO.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49735104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Data-driven future for nanofiltration: Escaping linearity 数据驱动的纳滤未来:逃避线性

Journal of Membrane Science Letters Pub Date : 2023-05-01 DOI: 10.1016/j.memlet.2023.100040

Gergo Ignacz, Aron K. Beke, Gyorgy Szekely

{"title":"Data-driven future for nanofiltration: Escaping linearity","authors":"Gergo Ignacz, Aron K. Beke, Gyorgy Szekely","doi":"10.1016/j.memlet.2023.100040","DOIUrl":"https://doi.org/10.1016/j.memlet.2023.100040","url":null,"abstract":"<div><p>Compared with traditional membrane separation methods such as distillation and chromatography, nanofiltration (NF) affords decreased waste generation and energy consumption. Despite the multiple advantages of NF and materials available for NF membranes, the industrial applicability of this process requires improvement. To address these challenges, we propose four important pillars for the future of membrane materials and process development. These four pillars are digitalization, structure–property analysis, miniaturization, and automation. We fill gaps in the development of NF membranes and processes by fostering the most promising contemporary technologies, e.g., the integration of process analytical technologies and the development of a parallel artificial nanofiltration permeability assay (PANPA) or large online databases. Moreover, we propose the extensive use of density functional theory-aided structure–property relationship methods to understand solute transport process at a molecular level. Realizing an inverse design would allow researchers and industrial scientists to develop custom membranes for specific applications using optimized properties.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49735028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

On the balance between albumin loss and removal of middle molecules in dialyzers 透析器中白蛋白损失与中间分子去除的平衡

Journal of Membrane Science Letters Pub Date : 2023-05-01 DOI: 10.1016/j.memlet.2023.100044

Franziska Hagemann , John Linkhorst , Hannah Roth , Matthias Wessling

{"title":"On the balance between albumin loss and removal of middle molecules in dialyzers","authors":"Franziska Hagemann , John Linkhorst , Hannah Roth , Matthias Wessling","doi":"10.1016/j.memlet.2023.100044","DOIUrl":"https://doi.org/10.1016/j.memlet.2023.100044","url":null,"abstract":"<div><p>Tuning the pore size distribution of hemodialysis membranes is essential for the membrane’s selectivity and significantly affects the quality of the dialysis treatment. Tailoring the membrane’s molecular weight cut-off appropriately balances the removal of middle-molecular-weight uremic toxins while avoiding albumin loss. This undesirable albumin loss is a potential side effect and concern for clinical use when aiming at increased removal of middle molecular weight molecules (middle molecules). It is hypothesized that control of the position of a narrow pore size distribution allows middle molecule removal while simultaneously counteracting the unwanted albumin loss. This study presents a comprehensive ex-vivo methodology and novel data on the balance of the clearance of middle molecules and albumin loss at different blood and dialysate flow rates using novel dialyzers. The outcomes hold significance for dialysis therapy, while the insights acquired have broader implications for the selectivity of ultrafiltration membranes.</p><p>The Theranova dialyzer shows the largest clearance for small-middle molecules. Phylther stands out with higher removal of the middle molecule YKL-40 than the other dialyzers but exhibits a significant albumin loss. Theranova demonstrates the best compromise between low albumin loss and good clearances of middle molecules.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49735033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes 三氟乙酸对有机-无机杂化二氧化硅膜CO2输运性能的催化作用

Journal of Membrane Science Letters Pub Date : 2023-05-01 DOI: 10.1016/j.memlet.2023.100047

Ikram Rana, Hiroki Nagasawa, Toshinori Tsuru, Masakoto Kanezashi

{"title":"Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes","authors":"Ikram Rana, Hiroki Nagasawa, Toshinori Tsuru, Masakoto Kanezashi","doi":"10.1016/j.memlet.2023.100047","DOIUrl":"https://doi.org/10.1016/j.memlet.2023.100047","url":null,"abstract":"<div><p>Developing silica membranes that are highly selective for CO<sub>2</sub> has always been a challenge due to the small sizes of the pores and less amount of CO<sub>2</sub> philic sites in a typical silica network structure. Herein, we describe the fabrication of silica (tetraethoxysilane) membranes functionalized with 3-aminopropyltriethoxysilyl (APTES) and trifluoroacetic acid (TFA). An interaction generated among primary (NH<sub>2</sub>) amines and TFA was identified, which was then also revealed by the reversible nature of CO<sub>2</sub> adsorption/desorption — an opposite trend from observations when using another catalyst (HCl). The resultant TEOS-APTES (TFA) membranes demonstrated CO<sub>2</sub> permeance of 3.8 × 10<sup>−7</sup> mol m <sup>−</sup> <sup>2</sup> s <sup>−</sup> <sup>1</sup> Pa<sup>−1</sup> and CO<sub>2</sub>/N<sub>2</sub> selectivity of 35 at 50 ⁰C via the effect of surface diffusion. This is attributed to the increased microporosity and structural variations affected by TFA, which enhanced molecular sieving and controls the CO<sub>2</sub>-philic sites (-NHCOCF<sub>3</sub>) via interaction with amines. This novel approach would be effective for the energy-efficient fabrication of highly CO<sub>2</sub>-permeable membranes.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49716954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-phase ionic-conducting membranes: Pressure dependence of gas permeation flux 双相离子导电膜:气体渗透通量的压力依赖性

Journal of Membrane Science Letters Pub Date : 2023-05-01 DOI: 10.1016/j.memlet.2023.100041

Jerry Y.S. Lin, Oscar Ovalle-Encinia

{"title":"Dual-phase ionic-conducting membranes: Pressure dependence of gas permeation flux","authors":"Jerry Y.S. Lin, Oscar Ovalle-Encinia","doi":"10.1016/j.memlet.2023.100041","DOIUrl":"https://doi.org/10.1016/j.memlet.2023.100041","url":null,"abstract":"<div><p>Pressure dependence of gas permeation flux for dual-phase ionic-conducting membranes is critical to the design and operation of separation or reaction processes using these membranes. However, literature on dual-phase membranes has mainly focused on temperature, rather than pressure dependence of gas permeation flux. This paper presents a theoretical approach for the development of the pressure dependence of gas permeation flux for dual-phase membranes, demonstrated with CO<sub>2</sub> permeation for samarium-doped-ceria (SDC)/molten-carbonate (MC) dual-phase membranes. The paper presents a model showing that gas permeation through dual-phase ionic-conducting membranes is controlled not only by the intrinsic ion (or electronic) conductivity of the materials for each phase, but also by the geometric factor defined as the ratio of the volume to tortuosity of each phase. These geometric factors for both phases are determined by the topological structure of each phase. Dual-phase membranes of the same materials can have very different pressure-dependent flux equations depending on the topological structure dictated by synthesis method and conditions. CO<sub>2</sub> permeation through SDC-MC membranes made of SDC with low porosity is controlled by carbonate conduction in the molten carbonate phase, leading to logarithmic CO<sub>2</sub> pressure-dependent flux equation. CO<sub>2</sub> permeation through SDC-MC membrane of SDC with intermediate porosity is controlled by oxygen ionic conduction in the SDC phase, and the CO<sub>2</sub> permeation flux shows power-law dependence on CO<sub>2</sub> pressures. The validity of the model is confirmed by comparison of the modeling results with experimental CO<sub>2</sub> permeation data for SDC-MC membranes. This work provides a direction for developing pressure-dependent gas permeation flux equations for various dual-phase ionic-conducting membranes.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49717056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Can machine learning methods guide gas separation membranes fabrication? 机器学习方法能否指导气体分离膜的制作?

Journal of Membrane Science Letters Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100033

Arash Tayyebi , Ali S. Alshami , Xue Yu , Edward Kolodka

{"title":"Can machine learning methods guide gas separation membranes fabrication?","authors":"Arash Tayyebi , Ali S. Alshami , Xue Yu , Edward Kolodka","doi":"10.1016/j.memlet.2022.100033","DOIUrl":"10.1016/j.memlet.2022.100033","url":null,"abstract":"<div><p>Transforming a vast array of candidate materials into membranes with suitable morphologies and improved molecular separation performance is an arduous and costly endeavor for membrane scientists. With the advancement made in artificial intelligence and machine-learning in recent years, it is timely to ask: can machine learning methods guide gas separation membranes Fabrication? The answer is “YES”, and this article explains the justifications for this answer by systematically reviewing and analyzing the up-to-date research efforts in the field. This work aimed to explore the potential of ML algorithms as an effective and cost-saving tool in guiding the experimental process of developing the next generation polymeric membranes, and in addressing the critical needs in the field. Findings demonstrate that training Heteropolymers instead of Homopolymers, synthesizing novel polymers by an inverse design approach, and using reliable datasets that are created under the same conditions, are the most crucial factors to achieve the design intent. A path from A to Z for anyone who intends to use ML algorithms in the membranes’ synthesis process is offered. The article concludes with a brief discussion on future development prospects and open issues that are yet to be addressed for ML‐driven polymeric‐based membranes design and optimization.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000204/pdfft?md5=c60a8e2f5f689447b3c781338cf24f9e&pid=1-s2.0-S2772421222000204-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88002578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Designing triple-layer superhydrophobic/hydrophobic/hydrophilic nanofibrous membrane via electrohydrodynamic technique for enhanced anti-fouling and anti-wetting in wastewater treatment by membrane distillation 利用电水动力学技术设计超疏水/疏水/亲水三层纳米纤维膜，增强膜蒸馏处理废水的防污防湿能力

Journal of Membrane Science Letters Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100030

Xiao-Qiong Wu , Xing Wu , Hui-Wen Huo , Quan-Bao Zhao , Yu-Ming Zheng , Zongli Xie

{"title":"Designing triple-layer superhydrophobic/hydrophobic/hydrophilic nanofibrous membrane via electrohydrodynamic technique for enhanced anti-fouling and anti-wetting in wastewater treatment by membrane distillation","authors":"Xiao-Qiong Wu , Xing Wu , Hui-Wen Huo , Quan-Bao Zhao , Yu-Ming Zheng , Zongli Xie","doi":"10.1016/j.memlet.2022.100030","DOIUrl":"10.1016/j.memlet.2022.100030","url":null,"abstract":"<div><p>Developing high-performance membranes for membrane distillation (MD) to treat highly saline industrial wastewater is of great significance. In this work, a superhydrophobic/hydrophobic/hydrophilic triple-layer membrane combining an electrosprayed superhydrophobic top layer, an electrospun hydrophobic nanofibrous intermediate layer and a hydrophilic microporous membrane substrate was fabricated by using electrohydrodynamic techniques. The top superhydrophobic surface possesses a unique surface morphology composing of hydrophobic SiO<sub>2</sub>-polymer microbeads with nanoscaled protrusions and interconnected thin nanofibers, which contributed to the enhanced water flux for desalination in direct contact MD. By tuning the concentrations of hydrophobic SiO<sub>2</sub> nanoparticles and polyvinylidene fluoride-co-hexafluoropropylene for electrospraying the top layer, the triple-layer membrane showed both enhanced anti-fouling and anti-wetting properties due to the reduced liquid-solid contact area and stable Cassie-Baxter state. The triple-layer membrane exhibited stable MD performances when using real seawater and industrial flue gas desulfurization wastewater as the feed solutions, while no obvious fouling and wetting being observed even at 60% water recovery. This study provides an effective approach for fabricating a high-performance triple-layer superhydrophobic/hydrophobic/hydrophilic membrane for potential practical MD applications for industrial wastewater treatment.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000174/pdfft?md5=c21f9aac6cbf4a568f526f659a114752&pid=1-s2.0-S2772421222000174-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87827556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Creation of water-permeation pathways with matrix-polymer functionalized carbon nanotubes in polymeric membranes for pervaporation desalination 基质聚合物功能化碳纳米管在渗透蒸发脱盐聚合物膜上的水渗透途径的建立

Journal of Membrane Science Letters Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100027

Cheng Tseng, Ying-Ling Liu

{"title":"Creation of water-permeation pathways with matrix-polymer functionalized carbon nanotubes in polymeric membranes for pervaporation desalination","authors":"Cheng Tseng, Ying-Ling Liu","doi":"10.1016/j.memlet.2022.100027","DOIUrl":"10.1016/j.memlet.2022.100027","url":null,"abstract":"<div><p>Membrane-based pervaporation desalination is an effective process for freshwater resource and treatments on waste brines. Both water permeation fluxes and salt rejection are concerned for the membrane-based desalination. In this work an effective approach to increase the water permeation fluxes of the pervaporation desalination membranes has been demonstrated through utilization of matrix-polymer functionalized carbon nanotubes in creation of water permeation pathways in the membranes. With poly(vinyl alcohol) (PVA) as the matrix polymer for membrane fabrication, a small amount of PVA-functionalized CNTs (0.06 wt%) effectively increases the water permeation fluxes of the PVA membranes from 1,630 to 6,140 gm<sup>−2</sup>h<sup>−1</sup> (feeding solution: 3.5 wt% NaCl<sub>(aq)</sub> at 25 °C) without sacrifice of salt rejection, corresponding to a 3.77-times of increase in water permeation flux. The membrane is also workable on concentrated salt aqueous solution (15 wt% NaCl<sub>(aq)</sub>). The approach has the potential to be employed to other polymer membranes for pervaporation separation.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000150/pdfft?md5=819325be50ea8bff635e42aef1c9a101&pid=1-s2.0-S2772421222000150-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90477027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Are commercial polyamide seawater and brackish water membranes effectively charged? 商用聚酰胺海水膜和微咸水膜是否有效带电?

Journal of Membrane Science Letters Pub Date : 2022-11-01 DOI: 10.1016/j.memlet.2022.100032

Bastiaan Blankert, Kees Theo Huisman, Fernan David Martinez, Johannes Simon Vrouwenvelder, Cristian Picioreanu

{"title":"Are commercial polyamide seawater and brackish water membranes effectively charged?","authors":"Bastiaan Blankert, Kees Theo Huisman, Fernan David Martinez, Johannes Simon Vrouwenvelder, Cristian Picioreanu","doi":"10.1016/j.memlet.2022.100032","DOIUrl":"10.1016/j.memlet.2022.100032","url":null,"abstract":"<div><p>New developments in modeling solute transport in reverse osmosis (RO) membranes are based on the mechanistic description of solution friction and electromigration. In these models, the membrane charge significantly impacts the separation that occurs in the membrane through Donnan partitioning. One implication of membrane charge is that the salt permeability strongly depends on the ion concentration in the feedwater. In this study, we experimentally evaluate the effect of salinity, varied over almost two orders of magnitude (ca. 10–650mM), on four commercially available polyamide seawater RO and brackish water RO membranes. We found no significant effect of feed concentration on observed salt permeability, while the membrane performance closely resembled the specification by the manufacturers. We also demonstrate that a minor leak in the membrane provides a plausible alternative explanation to trend between concentration and salt permeability reported in other studies. The standard solution diffusion model provides a satisfactory description of our data for the membranes and feedwater conditions that we tested.</p></div>","PeriodicalId":100805,"journal":{"name":"Journal of Membrane Science Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772421222000198/pdfft?md5=b1fba880453088cfe37fe539f667d121&pid=1-s2.0-S2772421222000198-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76763702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5