Membranes最新文献

{"title":"Organic Solvent Nanofiltration Membrane with In Situ Constructed Covalent Organic Frameworks as Separation Layer.","authors":"Fangyi Xu, Shuxin Zhao, Junjie Song, Yu Peng, Baowei Su","doi":"10.3390/membranes14110234","DOIUrl":"10.3390/membranes14110234","url":null,"abstract":"<p><p>Organic solvent nanofiltration (OSN) technology is advantageous for separating mixtures of organic solutions owing to its low energy consumption and environmental friendliness. Covalent organic frameworks (COFs) are good candidates for enhancing the efficiency of solvent transport and ensuring precise molecular sieving of OSN membranes. In this study, p-phenylenediamine (Pa) and 1,3,5-trimethoxybenzene (Tp) are used to construct, in situ, a TpPa COF skin layer via interfacial polymerization (IP) on a polyimide substrate surface. After subsequent crosslinking and activation steps, a kind of TpPa/polyimide (PI) OSN membrane is obtained. Under optimized fabrications, this OSN membrane exhibits an ethanol permeance of 58.0 LMH/MPa, a fast green FCF (FGF) rejection of 96.2%, as well as a pure <i>n</i>-hexane permeance of 102.0 LMH/MPa. Furthermore, the TpPa/PI OSN membrane exhibits good solvent resistance, which makes it suitable for the separation, purification, and concentration of organic solvents.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596232/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon-Doped TiO₂ Nanofiltration Membranes Prepared by Interfacial Reaction of Glycerol with TiCl₄ Vapor.","authors":"Wenjing Zhang, Jiangzhou Luo, Honglei Ling, Lei Huang, Song Xue","doi":"10.3390/membranes14110233","DOIUrl":"10.3390/membranes14110233","url":null,"abstract":"<p><p>In the pursuit of developing advanced nanofiltration membranes with high permeation flux for organic solvents, a TiO₂ nanofilm was synthesized via a vapor-liquid interfacial reaction on a flat-sheet α-Al₂O₃ ceramic support. This process involves the reaction of glycerol, an organic precursor with a structure featuring 1,2-diol and 1,3-diol groups, with TiCl₄ vapor to form organometallic hybrid films. Subsequent calcination in air at 250 °C transforms these hybrid films into carbon-doped titanium oxide nanofilms. The unique structure of glycerol plays a crucial role in determining the properties of the resulting nanopores, which exhibit high solvent permeance and effective solute rejection. The synthesized carbon-doped TiO₂ nanofiltration membranes demonstrated impressive performance, achieving a pure methanol permeability as high as 90.9 L·m^-2·h ^-1·bar^-1. Moreover, these membranes exhibited a rejection rate of 93.2% for Congo Red in a methanol solution, underscoring their efficacy in separating solutes from solvents. The rigidity of the nanopores within these nanofilms, when supported on ceramic materials, confers high chemical stability even in the presence of polar solvents. This robustness makes the carbon-doped TiO₂ nanofilms suitable for applications in the purification and recovery of organic solvents.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596831/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modulation of Biological Membranes Using Small-Molecule Compounds to Counter Toxicity Caused by Amyloidogenic Proteins.","authors":"Raina Marie Seychell, Adam El Saghir, Neville Vassallo","doi":"10.3390/membranes14110231","DOIUrl":"10.3390/membranes14110231","url":null,"abstract":"<p><p>The transition of peptides or proteins along a misfolding continuum from soluble functional states to pathological aggregates, to ultimately deposit as amyloid fibrils, is a process that underlies an expanding group of human diseases-collectively known as protein-misfolding disorders (PMDs). These include common and debilitating conditions, such as Alzheimer's disease, Parkinson's disease, and type-2 diabetes. Compelling evidence has emerged that the complex interplay between the misfolded proteins and biological membranes is a key determinant of the pathogenic mechanisms by which harmful amyloid entities are formed and exert their cytotoxicity. Most efforts thus far to develop disease-modifying treatments for PMDs have largely focused on anti-aggregation strategies: to neutralise, or prevent the formation of, toxic amyloid species. Herein, we review the critical role of the phospholipid membrane in mediating and enabling amyloid pathogenicity. We consequently propose that the development of small molecules, which have the potential to uniquely modify the physicochemical properties of the membrane and make it more resilient against damage by misfolded proteins, could provide a novel therapeutic approach in PMDs. By way of an example, natural compounds shown to intercalate into lipid bilayers and inhibit amyloid-lipid interactions, such as the aminosterols, squalamine and trodusquamine, cholesterol, ubiquinone, and select polyphenols, are discussed. Such a strategy would provide a novel approach to counter a wide range of toxic biomolecules implicit in numerous human amyloid pathologies.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596372/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance Analysis of Air Gap Membrane Distillation Process Enhanced with Air Injection for Water Desalination.","authors":"Jonathan Ibarra-Bahena, Ulises Dehesa-Carrasco, Rogelio Servando Villalobos-Hernández, Sofía Garrido-Hoyos, Wilfrido Rivera","doi":"10.3390/membranes14110232","DOIUrl":"10.3390/membranes14110232","url":null,"abstract":"<p><p>Water scarcity is a global issue, and desalination is an alternative to providing fresh water. Renewable energies could be used in thermal desalination to produce freshwater from high saline concentration solutions. In this paper, the experimental performance of an air-injection-Air Gap Membrane Distillation (AGMD) module is presented. The effect of the operation parameters (saline solution temperature, air flow, and salt concentration) on the distilled water rate was evaluated. The air injection enhanced the distilled water rate by 22% at the highest air flow and a solution flow rate of 80 °C, compared to the conventional condition (without air injection) at a salt concentration of 100,000 ppm. Under the same operating conditions, the increase was 17% at a salt concentration of 70,000 ppm. The maximum distilled water rate was 14.10 L/m²·h at 80 °C and an airflow of 1.5 L/min with the highest salt concentration, while it was also 14.10 L/m²·h at the lower salt concentration was 14.10 L/m²·h. The distilled water quality also improved as the air flow increased, since a conductivity reduction of 66% was observed. With the described mathematical model, 94% of the calculated values fell within ±10% of the experimental data for both salt concentration conditions.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596555/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing CO₂/N₂ and CO₂/CH₄ Separation Properties of PES/SAPO-34 Membranes Using Choline Chloride-Based Deep Eutectic Solvents as Additives.","authors":"Jonathan S Cardoso, Zhi Lin, Paulo Brito, Licínio M Gando-Ferreira","doi":"10.3390/membranes14110230","DOIUrl":"10.3390/membranes14110230","url":null,"abstract":"<p><p>CO₂ separation is an important environmental method mainly used in reducing CO₂ emissions to mitigate anthropogenic climate change. The use of mixed-matrix membranes (MMMs) arrives as a possible answer, combining the high selectivity of inorganic membranes with high permeability of organic membranes. However, the combination of these materials is challenging due to their opposing nature, leading to poor interactions between polymeric matrix and inorganic fillers. Many additives have been tested to reduce interfacial voids, some of which showed potential in dealing with compatibility problems, but most of them lack further studies and optimization. Deep eutectic solvents (DESs) have emerged as IL substitutes since they are cheaper and environmentally friendly. Choline chloride-based deep eutectic solvents were studied as additives in polyethersulfone (PES)/SAPO-34 membranes to improve CO₂ permeability and CO₂/N₂ and CO₂/CH₄ selectivity. SAPO-34 crystals of 150 nm with a high surface area and microporosity were synthesized using dry-gel methodology. The PES/SAPO-34 membranes were optimized following previous work and used in a defined composition, using 5 or 10 <i>w</i>/<i>w</i>% of DES during membrane preparation. All MMMs were characterized by their ideal gas permeability using N₂ and CO₂ pure gasses. Selected membranes were also tested using CH₄ pure gas. The results presented that 5 <i>w</i>/<i>w</i>%, in polymer mass, of ChCl-glycerol presented the best result over the synthesized membranes. An increase of 200% in CO₂ permeability maintains the CO₂/N₂ selectivity for the non-modified PES/SAPO-34 membrane. A CO₂/CH₄ selectivity of 89.7 was obtained in PES/SAPO-34/ChCl-glycerol membranes containing 5 <i>w</i>/<i>w</i>% of this DES, which is an outstanding ideal separation performance for MMMs when compared to other results in the literature. FTIR analysis reiterates the presence of glycerol in the membranes prepared. Dynamic Mechanical Thermal Analysis (DMTA) shows that the addition of 5 <i>w</i>/<i>w</i>% of DES does not impact the membrane flexibility or polymer structure. However, in concentrations higher than 10 <i>w</i>/<i>w</i>%, the inclusion of DES could lead to high membrane rigidification without impacting the overall thermal resistance. SEM analysis of DES-enhanced membranes presented asymmetric final membranes and reaffirmed the results obtained in DMTA about rigidified structures and lower zeolite-polymer interaction with higher concentrations of DES.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596722/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Celebrating Moises A. Carreon: Special Edition Tribute to an Innovator in Membranes and Materials Science Research.","authors":"Surendar R Venna","doi":"10.3390/membranes14110229","DOIUrl":"10.3390/membranes14110229","url":null,"abstract":"<p><p>Professor Moises A [...].</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596139/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perspectives and State of the Art of Membrane Separation Technology as a Key Element in the Development of Hydrogen Economy.","authors":"M Olga Guerrero-Pérez","doi":"10.3390/membranes14110228","DOIUrl":"10.3390/membranes14110228","url":null,"abstract":"<p><p>Due to the objectives established by the European Union and other countries, hydrogen production will be a key technology in the coming decades. There are several starting materials and procedures for its production. All methods have advantages and disadvantages, and the improvements in their performance and decreases in operational costs will be decisive in determining which of them is implemented. For all cases, including for the storage and transport of hydrogen, membranes determine the performance of the process, as well as the operational costs. The present contribution summarizes the most recent membrane technologies for the main methods of hydrogen production, including the challenges to overcome in each case.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596072/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mitigating Membrane Fouling in Abattoir Wastewater Treatment: Integration of Pretreatment Step with Zwitterion Modified Graphene Oxide-Polyethersulfone Composite Membranes.","authors":"Meladi L Motloutsi, Funeka Matebese, Mxolisi M Motsa, Muthumuni Managa, Richard M Moutloali","doi":"10.3390/membranes14110227","DOIUrl":"10.3390/membranes14110227","url":null,"abstract":"<p><p>Composite polyethersulfone (PES) membranes containing N-aminoethyl piperazine propane sulfonate (AEPPS)-modified graphene oxide (GO) were integrated with either of the two pretreatment processes (activated carbon (AC) adsorption or polyelectrolyte coagulation) to assess their effectiveness in mitigating membrane fouling during the treatment of abattoir wastewater. The AEPPS@GO-modified membranes, as compared to the pristine PES membranes, showed improved hydrophilicity, with water uptake increasing from 72 to 118%, surface porosity increasing from 2.34 to 27%, and pure water flux (PWF) increasing from 235 to 673 L.m^-2h^-1. The modified membranes presented improved antifouling properties, with the flux recovery ratio (<i>FRR</i>) increasing from 59.5 to 93.3%. This study compared the effectiveness of the two pretreatment processes, AC, coagulation, and the integrated system (coagulation/AC-UF membrane), in the removal of natural organic matter (NOM) and improvement of abattoir wastewater's pH, electrical conductivity, TDS, and turbidity. The integrated systems produced improved water quality in terms of pH, EC, TDS, turbidity, and organic content. The fluorescence excitation-emission matrix (FEEM) analysis exhibited almost no fluorescence peak post-treatment following organic loading removal. The quality of the water met the South African non-potable water reuse standards. The sole membrane treatment systems exhibited good fouling resistance without the pretreatment systems; however, integrating these systems can offer extended longer filtration periods, thereby assisting in cost aspects of the abattoir wastewater treatment system.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596602/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computational Analysis of Amine Functionalization in Zwitterionized Polyether Sulfone Dialysis Membranes.","authors":"Simin Nazari, Arash Mollahosseini, Amira Abdelrasoul","doi":"10.3390/membranes14110226","DOIUrl":"10.3390/membranes14110226","url":null,"abstract":"<p><p>Hemodialysis is a critical treatment for patients with end-stage renal disease (ESRD) who lack kidney transplant options. The compatibility of hemodialysis membranes is vital, as incompatibility can trigger inflammation, coagulation, and immune responses, potentially increasing morbidity and mortality among patients with ESRD. This study employed molecular dynamics simulation (MDS) and molecular docking to assess the hemocompatible properties of Polyether Sulfone (PES) membranes modified via two distinct amine functionalization techniques. The molecular docking results demonstrated that side amine functionalization exhibited a lower affinity energy (-7.6) for fibrinogen compared to the middle amine functionalization (-8.2), suggesting enhanced antifouling properties and superior hemocompatibility. Additionally, side amine functionalization formed hydrogen bonds with four amino acids, enhancing its resistance to protein adhesion compared to three amino acids in the middle amine structure. Furthermore, the molecular dynamics simulations revealed differences in water mobility, with the side amine functionalized membranes showing a lower mobility value (9.74 × 10^-7) than those treated with the middle amine method (9.85 × 10^-7), indicating higher water stability and potentially better patient outcomes. This study's findings contribute to the design of more efficient and safer hemodialysis treatments by optimizing membrane materials.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596656/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical Study of the Influence of Electroconvection on the Efficiency of Pulsed Electric Field (PEF) Modes in ED Desalination.","authors":"Victor Nikonenko, Aminat Uzdenova, Anna Kovalenko, Makhamet Urtenov","doi":"10.3390/membranes14110225","DOIUrl":"10.3390/membranes14110225","url":null,"abstract":"<p><p>Pulsed electric field (PEF) modes of electrodialysis (ED) are known for their efficiency in mitigating the fouling of ion-exchange membranes. Many authors have also reported the possibility of increasing the mass transfer/desalination rate and reducing energy costs. In the literature, such possibilities were theoretically studied using 1D modeling, which, however, did not consider the effect of electroconvection. In this paper, the analysis of the ED desalination characteristics of PEF modes is carried out based on a 2D mathematical model including the Nernst-Planck-Poisson and Navier-Stokes equations. Three PEF modes are considered: galvanodynamic (pulses of constant electric current alternate with zero current pauses), potentiodynamic (pulses of constant voltage alternate with zero voltage pauses), and mixed galvanopotentiodynamic (pulses of constant voltage alternate with zero current pauses) modes. It is found that at overlimiting currents, in accordance with previous papers, in the range of relatively low frequencies, the mass transfer rate increases and the energy consumption decreases with increasing frequency. However, in the range of high frequencies, the tendency changes to the opposite. Thus, the best characteristics are obtained at a frequency close to 1 Hz. At higher frequencies, the pulse duration is too short, and electroconvective vortices, enhancing mass transfer, do not have time to develop.</p>","PeriodicalId":18410,"journal":{"name":"Membranes","volume":"14 11","pages":""},"PeriodicalIF":3.3,"publicationDate":"2024-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11596199/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142730234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}