Membranes and Membrane Technologies最新文献

{"title":"Structure and Properties of Cellulose Acetate Membranes Modified via Biocidal Compositions Obtained from Forest Chemical Raw Materials","authors":"T. A. Hliavitskaya,&nbsp;E. I. Gapan’kova,&nbsp;I. A. Latyshevich,&nbsp;E. D. Skakovskii,&nbsp;V. S. Kauychkina,&nbsp;G. B. Melnikova,&nbsp;Kh. Kh. Turaev,&nbsp;Sh. A. Kasimov,&nbsp;A. V. Bildyukevich","doi":"10.1134/S2517751625600414","DOIUrl":"10.1134/S2517751625600414","url":null,"abstract":"<p>The effect of a natural biocide based on forest chemical raw materials as an additive to cellulose acetate (CA) casting solutions on the structure and properties of the resulting membranes was studied. The NMR method was used to determine the component composition of rosin and turpentine, from which rosin terpene maleic adduct (RTMA) was obtained. Successful modification of the AC-membranes was confirmed by the results of FTIR-spectroscopy. The operational properties of AC-membranes were studied (electron microscopy, atomic force microscopy, study of the transport properties of membranes). It was shown that the introduction of 1.5–2.0 wt % RTMA into the casting solutions does not affect the transport properties of the membranes, but decrease the surface roughness of the selective layer. At the same time, modified membranes are characterized by increased antibacterial resistance and resistance to fungal fouling.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 1","pages":"82 - 95"},"PeriodicalIF":1.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073861","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}

{"title":"Approbation of Polysulfone Membranes for Selective Recovery of Ammonium from Aqueous Solutions Using Liquid–Liquid Membrane Contactors","authors":"V. A. Troitskiy,&nbsp;E. S. Titova,&nbsp;D. Yu. Butylskii,&nbsp;V. V. Nikonenko,&nbsp;E. S. Korzhova,&nbsp;V. P. Vasilevsky,&nbsp;N. D. Pismenskaya","doi":"10.1134/S2517751625600220","DOIUrl":"10.1134/S2517751625600220","url":null,"abstract":"<p>The process of selective recovery of ammonium nitrogen from a multicomponent feed solution (<span>({text{NH}}_{4}^{ + })</span>, K⁺, Cl^–, <span>({text{HPO}}_{4}^{{2 - }})</span>, pH 9.3) into a stripping solution (HCl, pH 3.0) has been studied using a liquid–liquid membrane contactor. The feed and stripping solutions were separated by experimental polysulfone hollow fiber membranes with fundamentally different structures. One of them had a large-pore substrate and a dense nonporous layer on its surface (skin layer), and the other had an isotropic structure with uniformly distributed pores of about 50 nm in diameter. Two more asymmetric membranes made of polyetherimide or polyvinyltrimethylsilane were used for comparison. It has been shown that the ammonia nitrogen transfer coefficients through asymmetric membranes with a dense skin layer facing the feed solution are several times lower than those achieved in the case of a symmetric membrane. In the studied range of ammonium nitrogen concentrations in the feed solution (200–400 mmol/L), these coefficients reach values of (1–4) × 10^–3 m/h, which are comparable with the characteristics of the best hollow fiber gas separation membranes made of other materials presented in the scientific literature. A hypothesis is proposed to explain both the observed differences in behavior between membranes with different structures and the increase in the mass transfer coefficient of ammonia nitrogen upon dilution of the feed solution.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 1","pages":"15 - 31"},"PeriodicalIF":1.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073859","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}

{"title":"Effect of the Molecular Weight of Polyacrylic Acid in the Coagulation Bath on Structure and Properties of Polysulfone Membranes Modified with Polyethylene Glycol and Polypropylene Glycol Block Copolymer","authors":"K. S. Burts,&nbsp;T. V. Plisko,&nbsp;S. A. Pratsenko,&nbsp;A. V. Bildyukevich","doi":"10.1134/S2517751625600384","DOIUrl":"10.1134/S2517751625600384","url":null,"abstract":"<p>Membrane fouling is a major challenge in practical membrane applications, which cannot be completely avoided but can be minimized. A promising approach to membrane modification is the introduction of hydrophilic polymers or polyelectrolytes into the coagulation bath (CB) during membrane fabrication via the phase inversion method. This study systematically investigates the influence of polyacrylic acid (PAA) molecular weight (100 000, 250 000, and 450 000 g mol^–1) on the structure, surface physicochemical properties, transport characteristics, and fouling resistance of polysulfone (PSf) membranes modified with the amphiphilic block copolymer polyethylene glycol-polypropylene glycol (Synperonic F108). Aqueous PAA solutions (0.4–2.0 wt %) were used as the CB. The results demonstrate that ultrafiltration PSf/Synperonic F108/PAA membranes exhibit significantly enhanced surface hydrophilicity (water contact angle decreases from 53° to 10°–32°), reduced surface roughness, and a more negatively charged surface compared to unmodified membranes. The use of PAA solutions in the CB leads to a denser membrane structure, characterized by a decrease in the average pore size and number of pores in the selective layer. As a result, the pure water permeability declines from 195 to 21–66 L m^–2 h^–1, while selectivity improves substantially. The rejection coefficients increase from 56 to 76–94% for polyvinylpyrrolidone (PVP K30, <i>M</i>_<i>n</i> = 40 000 g mol^–1) and from 55 to 92–94% for lysozyme. The modified membrane structure and permeability also significantly enhance fouling resistance during filtration of a humic acid model solution: the flux recovery ratio (FRR) improves from 74 to 92–100%, and the total flux decline (DT) decreases from 30 to 0–5%, while maintaining high efficiency in iron and color removal.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 1","pages":"67 - 81"},"PeriodicalIF":1.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073953","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}

{"title":"Effect of Concentration Polarization in the Pervaporation Separation of n-Butanol through a Composite Membrane Based on Poly(decyl/pentafluoropropyl acrylate)methylsiloxane Copolymer","authors":"T. N. Rokhmanka,&nbsp;G. S. Golubev,&nbsp;E. A. Grushevenko,&nbsp;I. L. Borisov","doi":"10.1134/S2517751625600372","DOIUrl":"10.1134/S2517751625600372","url":null,"abstract":"<p>The transport and separation characteristics of the composite membrane with a selective layer based on a copolymer of polydecylmethylsiloxane and polymethylpentafluoropropylsiloxane (50F5) were studied during the pervaporation recovery of <i>n</i>-butanol from aqueous mixtures. It was shown that the membrane with the selective layer of copolymer (M-50F5 exhibits a high separation factor for <i>n</i>-butanol/water (35) and a total permeate flux of 0.31 kg/(m² h). For the first time, an analysis of the impact of concentration polarization on the efficiency of <i>n</i>-butanol recovery from a model fermentation mixture was conducted, including the calculation of the concentration polarization modulus and the thickness of the diffusion boundary layer. It was revealed that increasing the flow rate of the feed mixture above 30 cm/s eliminates concentration polarization effects, as evidenced by a reduction in the boundary layer thickness to zero. Optimization of the hydrodynamic regime allowed for the minimization of mass transfer limitations caused by concentration polarization, particularly at low butanol concentrations. The obtained results substantiate the potential of using 50F5-based membranes for the pervaporation recovery of butanol from fermentation broths and open new opportunities for improving separation technologies for multicomponent systems.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 1","pages":"32 - 42"},"PeriodicalIF":1.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073952","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}

{"title":"Oxidative Dehydrogenation of Ethane on Titanium and Vanadium Oxides Deposited on SiO2 by Molecular Layer Deposition and Selective Separation of Ethylene from the Resulting Mixture","authors":"N. A. Zhilyaeva,&nbsp;E. Yu. Mironova,&nbsp;A. A. Malkov,&nbsp;A. A. Malygin,&nbsp;I. A. Stenina,&nbsp;A. B. Yaroslavtsev","doi":"10.1134/S2517751625600190","DOIUrl":"10.1134/S2517751625600190","url":null,"abstract":"<p>The process of oxidative dehydrogenation of ethane on titanium-vanadium oxide catalysts deposited on silica gel by the molecular layer deposition method was studied. It was shown that the deposition of titanium and vanadium on the surface of silica occurs uniformly. When at least two layers are deposited titanium oxide crystallizes in the anatase phase while vanadium oxide remains X-ray amorphous in all catalysts. The influence of the titanium-to-vanadium ratio on the activity of the obtained catalysts was studied. It was shown that the conversion of ethane and the selectivity of its conversion into ethylene increase with increasing both the number of deposited titanium and vanadium layers and temperature. The maximum values of ethane/ethylene conversion and ethylene selectivity reach 19 and 85%, respectively. The possibility of separating ethylene and ethane in a mixture of gases leaving a catalytic reactor cooled to 30°C using a grafted ion-exchange membrane with ethylene enrichment up to 90% in three runs is demonstrated. The ethylene permeability during separation achieves 36 Barrer, and the separation factor of the ethane-ethylene mixture is 3.8.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 1","pages":"57 - 66"},"PeriodicalIF":1.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073951","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}

{"title":"Electrochemical Hydrogenation Using Membrane Reactors","authors":"I. A. Stenina,&nbsp;A. B. Yaroslavtsev","doi":"10.1134/S2517751625600451","DOIUrl":"10.1134/S2517751625600451","url":null,"abstract":"<p>Hydrogenation is one of the most crucial and widespread chemical processes. This review addresses the rapidly developing electrochemical hydrogenation technology using membrane reactors. A membrane acts simultaneously as a cathode for the electrochemical formation of hydrogen and a separator dividing the electrochemical compartment from the hydrogenation compartment with a substrate. Electrochemical membrane hydrogenation allows producing high-purity hydrogen directly from water, avoiding catalyst poisoning. In this case, hydrogen reaches the membrane surface in the hydrogenation compartment in a highly active atomic state. The choice of catalyst and process conditions enables one to tune selectivity of the process, and the separation of chemical processes occurring in the system can make it possible to eliminate the stage of products purification from at least some of the starting compounds and solvents. The various types of membranes that can be used in this technology are considered, as well as the processes of electrochemical hydrogenation of various organic and inorganic compounds in membrane reactors, including the processes of electrolytic hydrogen production and the operation of fuel cells. In conclusion, the prospects for the development of this technology are discussed.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 1","pages":"1 - 14"},"PeriodicalIF":1.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073954","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}

{"title":"Gas-Phase Fluorination of Hollow Fibers from Matrimid 5218® for Biogas Conditioning","authors":"D. A. Syrtsova,&nbsp;M. G. Shalygin,&nbsp;V. V. Teplyakov","doi":"10.1134/S2517751625600402","DOIUrl":"10.1134/S2517751625600402","url":null,"abstract":"<p>The influence of gas-phase fluorination conditions on the gas-selective properties of laboratory-scale hollow fiber membrane modules based on Matrimid 5218^® for the main components of biogas separation was investigated. The modification was carried out directly in laboratory membrane modules with a F₂/He gas mixture in the F₂ concentration range of 2–10 vol %. It was found that the interaction with fluorine leads to a change in the chemical structure of the selective membrane layer due to the replacement of hydrogen atoms by fluorine in the polymer structure. Increasing the fluorine concentration in the fluorination mixture and the fluorination time results in a decrease in the permeability of the modules to the target gases. As a result, the CO₂ permeability decreases by a factor of 4-5 and the CH₄ permeability by more than an order of magnitude, leading to an increase in selectivity (from 50 to 136) compared to the original hollow fibers. The high convergence of the ideal selectivity and separation factor of the СО₂/СН₄ mixture for hollow fibers modified under various conditions has been experimentally demonstrated. The temperature effect on the gas transfer parameters for modified hollow fiber modules based on Matrimid 5218^® was investigated. In the case of biogas separation under real conditions at <i>T</i> = 50°C (average temperature of vital activity of methanogenic bacteria), the selectivity of СО₂/СН₄ separation remains at a high level. For example, the CO₂/CH₄ selectivity for the module modified by 2% F₂ for 2 min was equal to 61, and the СО₂ permeability turns out to be 1.5 times higher in comparison with the original membranes. Based on the experimental results, operational schemes have been proposed and modelling of the biogas separation process with release of methane with high recovery rates (up to 99%) and ballast CO₂ using highly selective modified Matrimid 5218^® membranes has been carried out, moreover, with fluoridation of the modules in “soft” conditions, the indicators improve over time.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 1","pages":"43 - 56"},"PeriodicalIF":1.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073860","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}

{"title":"Effect of Titanosilicate Mineral Natisite on Gas Transport Properties of Copolyimide P84","authors":"A. E. Mukhin,&nbsp;G. A. Polotskaya,&nbsp;E. B. Lodonova,&nbsp;I. S. Kuryndin,&nbsp;V. N. Yakovenchuk,&nbsp;G. O. Kalashnikova,&nbsp;A. Yu. Pulyalina","doi":"10.1134/S2517751625600037","DOIUrl":"10.1134/S2517751625600037","url":null,"abstract":"<p>The development of membrane processes requires new materials for the fabrication of highly efficient membranes. In this work, a composite based on copolyimide P84 with a novel modifier, the titanosilicate mineral natisite, used an additive has been created. For this purpose, natisite has been synthesized and identified. The composite P84/natisite (5 wt %) prepared in a DMF solution was used to obtain a flat film membrane. The physicochemical, mechanical, and gas transport properties of the P84/natisite membrane were studied in comparison with the P84 membrane. The transport properties were evaluated by the permeability of the membranes to He, O₂, N₂, and CO₂. The gas permeability through the membranes made of the composite is lower than that of the pure P84 membrane, and the H₂/N₂, CO₂/N₂, and O₂/N₂ selectivities are improved by including the modifier natisite. It is shown that the presence of 5 wt % natisite does not significantly alter the mechanical properties of the P84/natisite (5%) membrane, which meet the performance requirements.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"6 6","pages":"424 - 432"},"PeriodicalIF":2.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645634","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}

{"title":"Effect of Feed Solution pH on Efficiency of Electrodialysis Extraction of Tartrates","authors":"O. A. Yurchenko,&nbsp;K. V. Solonchenko,&nbsp;N. D. Pismenskaya","doi":"10.1134/S2517751625600049","DOIUrl":"10.1134/S2517751625600049","url":null,"abstract":"<p>Resource-efficient and environmentally sustainable electrodialysis (ED) is increasingly being used for the separation and purification of organic acids, including the extraction of their anions from wines, juices, and biochemically processed waste products. In this study, tartaric acid transport through the CJMA-3 anion-exchange membrane was investigated using voltammetry, chronopotentiometry, and ED experiments. It was shown that when using a Na_<i>x</i>H_{(2–<i>x</i>)}T solution at pH 9.0, which contains only divalent tartrate anions T²⁻, the transport patterns are similar to those well-known for strong electrolytes. However, at pH 2.5 or 3.0, the solution contains a mixture of undissociated tartaric acid molecules H₂T and monovalent anions HT⁻. Upon entering the membrane, some of the HT⁻ anions dissociate. Protons are expelled into the depleted solution due to the Donnan effect, while the newly formed divalent anions T²⁻ migrate through the CJMA-3 membrane. The reduction in HT⁻ concentration near the membrane stimulates the irreversible dissociation of H₂T. Under the influence of the electric field, protons are removed from the reaction zone and migrate into the solution, while anions move into the membrane. Thus, tartrate transport through the anion-exchange membrane occurs even when the feed solution primarily contains undissociated acid molecules. These mechanisms lead to empirical limiting currents significantly exceeding theoretical limiting current values. The energy consumption for extracting 20% of tartrates from a 0.022 M Na_<i>x</i>H_{(2–<i>x</i>)}T solution is 0.22 (pH 9.0), 0.32 (pH 3.0), and 0.57 kWh/kg (pH 2.5). The duration of ED increases in the following order: pH 3.0 <span>( ll )</span> pH 9.0 &lt; pH 2.5.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"6 6","pages":"449 - 462"},"PeriodicalIF":2.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645423","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}

{"title":"Structural Properties and Gas Permeation for PTMSP Films Treated by Elemental Fluorine in Liquid Perfluorodecalin","authors":"N. A. Belov,&nbsp;A. Yu. Alentiev,&nbsp;R. Yu. Nikiforov,&nbsp;D. A. Syrtsova,&nbsp;V. P. Makrushin,&nbsp;S. M. Matson,&nbsp;E. A. Skryleva,&nbsp;A. I. Gaidar,&nbsp;V. E. Ryzhikh","doi":"10.1134/S2517751625600104","DOIUrl":"10.1134/S2517751625600104","url":null,"abstract":"<p>A one-sided modification of homogeneous poly(1-trimethylsilylpropyne) (PTMSP) films was carried out by the method of liquid-phase fluorination with elemental fluorine in perfluorodecalin medium. The structure of the initial and modified samples was studied by X-ray photoelectron spectroscopy (XPS) and cross-sections of fluorinated films were tested by scanning electron microscopy (SEM). The differential gas chromatographic method was used to obtain the transport and separation characteristics of the studied samples for O₂, N₂, CO₂, CH₄, He, H₂. Fluorination of PTMSP films was shown to occur not only in the near-surface layer of the sample, but also to a depth of up to 50 µm. It was found that the gas permeability of the fluorinated films decreases, while the change in the flow through the membrane depends on the size of the penetrant molecule, as a result there is a significant increase in the selectivity of fluorinated PTMSP samples for H₂–CO₂, H₂–CH₄, H₂–N₂ and O₂–N₂ pairs relative to the virgin polymer. It was shown that in the process of liquid-phase fluorination PTMSP films are saturated with perfluorodecalin, which leads to a significant decrease in gas permeability. An approach is proposed to increase the flow of gases through a fluorinated membrane by removing perfluorodecalin by holding samples in hexafluorobenzene, leading to a significant increase in gas permeability while maintaining selectivity. The gas separation data for fluorinated PTMSP films after treatment in hexafluorobenzene are located significantly above the upper bound of 2008 in the permeability-selectivity plots. Thus, the method of liquid-phase fluorination followed by hexafluorobenzene treatment leads to a significant improvement in the gas separation characteristics of PTMSP.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"6 6","pages":"409 - 423"},"PeriodicalIF":2.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645532","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}