Membranes and Membrane Technologies最新文献

{"title":"Beyond Pure-Gas Permeation: Designing an Efficient Two-Stage Membrane Process for Hydrogen Recovery from Reformate Mixtures","authors":"S. S. Kryuchkov,&nbsp;K. A. Smorodin,&nbsp;A. A. Atlaskin,&nbsp;A. A. Sysoev,&nbsp;M. E. Atlaskina,&nbsp;I. V. Vorotyntsev","doi":"10.1134/S2517751625600852","DOIUrl":"10.1134/S2517751625600852","url":null,"abstract":"<p>This work presents a comprehensive study on hydrogen recovery from a CO₂-containing mixture (75/25 mol %) using commercial polymer membranes. The gas transport properties of polyimide (PI), polysulfone (PSF), polyphenylene oxide (PPO), polyetherimide (PEI), and a PEI + PI composite were evaluated. A significant discrepancy was found between single-gas and mixture permeation data, highlighting the necessity of using mixture-based permeance for accurate process design. The PEI membrane demonstrated the optimal combination of H₂/CO₂ selectivity (5.07) and permeance. An optimized two-stage membrane process with recirculation was developed using Aspen Plus simulation, achieving a hydrogen purity of 95 mol % with 90% recovery. The techno-economic assessment confirmed the process feasibility, demonstrating a lower cost of hydrogen production compared to traditional methods.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 6","pages":"301 - 313"},"PeriodicalIF":1.6,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560409","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":"Study of Anionic Dye Removal from Aqueous Solutions by a Novel Ultrafiltration Ceramic Membrane with Carbon Coating","authors":"I. A. Kharchenko,&nbsp;I. R. Volkova,&nbsp;E. V. Elsuf’ev,&nbsp;E. V. Fomenko,&nbsp;G. V. Akimochkina,&nbsp;S. A. Vorobyev,&nbsp;A. S. Goltaev,&nbsp;I. I. Ryzhkov","doi":"10.1134/S2517751625600943","DOIUrl":"10.1134/S2517751625600943","url":null,"abstract":"<p>In this work, we propose a novel ultrafiltration ceramic membrane based on support from fly ash microspheres and selective layer from alumina nanofibers with carbon coating. The membrane is characterized by the average pore size of 19 nm and water permeability of 46 L/m² h bar. The filtration experiments with aqueous solutions of anionic dyes are performed in cross-flow mode. The membrane demonstrates high rejection of 96–97 and 99.8% for Reactive blue 4 (681 Da) and Direct red 80 (1373 Da), respectively. A lower rejection of 55–60 and 79–81% is found for Orange II (350 Da) and Indigo carmine (466 Da), respectively. The permeate flux is in the range 147–171 L/m² h at the transmembrane pressure of 5 bars. The solutions with lower dye concentration (20 vs. 100 mg/L) demonstrate higher degree of removal. The adsorption isotherms for considered dyes on the membrane support and selective layer as well as zeta potential of selective layer surface are measured. It allows us to reveal that the dye rejection occurs mainly due to electrostatic repulsion between anionic dyes and negatively charged membranes surface, while the contribution of adsorption to the rejection is minor. The present study provides new insights into the mechanisms of dye removal by ultrafiltration membranes and contributes to the development of solutions for wastewater treatment in dying and textile industries.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 6","pages":"338 - 353"},"PeriodicalIF":1.6,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560839","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":"Moments of the Sorption Kinetic Curve of Non-Integer Order","authors":"V. V. Ugrozov","doi":"10.1134/S2517751625600967","DOIUrl":"10.1134/S2517751625600967","url":null,"abstract":"<p>It is proposed for the first time to use non-integer order moments for the analysis of the sorption kinetics of gases and liquids by membranes and adsorbents. An analytical formula for the moment of the gas sorption kinetic curve by a homogeneous membrane of any non-negative order has been obtained. It is shown that the first and second order moments obtained using this formula coincide with known analytical expressions for these moments. An expression has been derived for calculating the diffusion coefficient using a non-integer order moment. Through mathematical modeling, it has been demonstrated that the error in determining the diffusion coefficient depends on the total measurement time of the sorption kinetic curve and the order of the kinetic curve moment.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 6","pages":"354 - 359"},"PeriodicalIF":1.6,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560835","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":"Permeability of Gases and Ammonia for Phosphorus-Containing Copolyimides","authors":"N. A. Belov,&nbsp;R. Yu. Nikiforov,&nbsp;S. D. Bazhenov,&nbsp;Abhijit Haldar,&nbsp;Sujata Mondal,&nbsp;Susanta Banerjee","doi":"10.1134/S2517751625600864","DOIUrl":"10.1134/S2517751625600864","url":null,"abstract":"<p>New copolyimides based on phosphorus-containing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), oxidianiline (ODA), and 4,4'-(4,4'-isopropylidenediphenoxy)bis-(phthalic anhydride) (BPADA) containing 50, 60, and 70 mol % DOPO were synthesized. The chemical structure of the obtained copolyimides has been confirmed by FTIR and ¹H NMR. A comprehensive physico-chemical investigation of the polymers has shown that they are characterized by high molecular weights (<i>M</i>_w = 40–60 kDa), polydispersity indices (PDI = 2.8–3.6), and have close glass transition temperatures (<i>T</i>_g = 223–227°C), however, they differ significantly in their physico-mechanical behavior: with an increase in the proportion of phosphorus-containing diamine in copolyimide sharply decreases the tensile strength (from 193 to 27 MPa), elasticity modulus (from 0.18 to 0.90 GPa) and elongation at break (from 1.8 to 0.6%). The gas permeation parameters for a standard set of gases (He, H₂, O₂, N₂, CO₂, CH₄) and ammonia measured by the barometric method were found to slightly depend on the phosphorus-containing diamine content, are close to each other, and to the corresponding parameters for a commercial polyimide Ultem based on BPADA. An increase in the upper membrane pressure of ammonia leads to an increase in its permeability and diffusion coefficient, which is caused by plasticization of the polyimide matrix. The synthesized new phosphorus-containing copolyimides and commercial Ultem polyimide have advantageous gas separation characteristics for He–CH₄ (α = 100–120) and NH₃–N₂ (α = 170–220) gas pairs. Significant deviations of the data for ammonia from the linear correlation of the diffusion coefficient with the square of the effective kinetic diameter (<i>d</i>_eff) by means of the literature data for <i>d</i>_eff(NH₃) were found. An attempt was made to estimate the new effective kinetic diameter of ammonia, which was 2.85 ± 0.17 Å, based on diffusion data for the three studied copolyimides.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 6","pages":"314 - 326"},"PeriodicalIF":1.6,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560838","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":"Separation of Diesel Fuel–Water Emulsions Using Microfiltration Ceramic Membranes from Fly Ash Microspheres","authors":"I. A. Kharchenko,&nbsp;I. R. Volkova,&nbsp;E. V. Elsuf’ev,&nbsp;R. A. Vaganov,&nbsp;E. V. Fomenko,&nbsp;G. V. Akimochkina,&nbsp;S. A. Vorob’ev,&nbsp;I. I. Ryzhkov","doi":"10.1134/S2517751625600955","DOIUrl":"10.1134/S2517751625600955","url":null,"abstract":"<p>Ceramic microfiltration membranes based on fly ash microspheres were used for the separation of diesel fuel (DF) in water emulsions. The membranes were characterized by an average pore size of 0.451 µm and a water permeability of 0.255 m³/(m² h bar). Filtration experiments in a dead-end configuration were conducted for emulsions with hydrocarbon phase concentrations from 100 to 1000 mg/L at a transmembrane pressure of 3 bar. The steady-state DF rejection was 97–98%, independent of concentration, while steady-state flux values ranged from 0.057 to 0.309 m³/(m² h). Lower flux values corresponded to higher DF concentrations. The decline in permeate flux over time due to membrane fouling was best described by the intermediate pore blocking model, which implies that the droplet size is comparable to the pore size, allowing droplets to deposit on top of each other. This conclusion is supported by droplet size distribution measurements, showing an average droplet size of 0.31–0.46 µm. The retention mechanism is determined by the formation of a hydrocarbon phase layer on the membrane surface, as well as electrostatic repulsion of droplets from the negatively charged surface. The obtained results can be used for the development and improvement of technologies for treating wastewater and produced water from oil and petroleum products.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 6","pages":"327 - 337"},"PeriodicalIF":1.6,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560836","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":"Pervaporation Efficiency of Composite Membranes Based on Sodium Alginate Polyelectrolyte Complex as a Function of Preparation Method","authors":"M. Dmitrenko,&nbsp;O. Mikhailovskaya,&nbsp;A. Kuzminova,&nbsp;N. Yakimova,&nbsp;S. Shipilovskikh,&nbsp;A. Penkova","doi":"10.1134/S2517751625600785","DOIUrl":"10.1134/S2517751625600785","url":null,"abstract":"<p>The unique size-dependent properties of nano-objects make them valuable building blocks for creating advanced chemical systems, facilitating breakthroughs in different areas. In pervaporation, composite membranes with a thin selective nano-sized layer are being actively developed, allowing a highly efficient separation of different mixtures. In this study, highly efficient composite membranes were developed by creation of a thin dense selective layer from polyelectrolyte complex (PEC) from sodium alginate (SA) and polyethylenimine (PEI). Composite PEC membranes were prepared by three methods: (1) physical adsorption, (2) by layer-by-layer (Lbl) technique and (3) in a dynamic mode. The structure of the thin selective layer of membranes were studied by scanning electron (SEM) and atomic force (AFM) microscopies. The physical adsorption method is the most effective for obtaining highly efficient composite membranes from PEС: 0.05–1.18 kg/(m² h) permeation flux and more than 95 wt % water in the permeate in pervaporation dehydration of ethanol (4–70 wt % water).</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 5","pages":"270 - 279"},"PeriodicalIF":1.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338643","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":"Lithium Extraction by Selective Electrodialysis: Mechanism and Optimization of Monovalent and Multivalent Ion Separation","authors":"V. A. Troitskiy,&nbsp;M. A. Ponomar,&nbsp;R. M. Salikhov,&nbsp;N. V. Smirnova,&nbsp;K. G. Sabbatovskii,&nbsp;S. A. Mareev,&nbsp;D. Yu. Butylskii,&nbsp;V. V. Nikonenko","doi":"10.1134/S251775162560092X","DOIUrl":"10.1134/S251775162560092X","url":null,"abstract":"<p>Selective electrodialysis with monovalent-ion-selective membranes has shown high efficiency for separating mono- and multivalent ions. However, the separation mechanism is not yet fully understood. This work studies two cation-exchange membranes from Astom, Japan: a standard-grade CSE membrane and a monovalent-cation-selective CIMS membrane. Based on the results of measurements of exchange capacity, water uptake, zeta potential, contact angle, specific electrical conductivity, and diffusion permeability of both membranes, it is suggested that the selective permeability of CIMS towards monovalent cations is provided both by an electrostatic barrier due to the presence of a selective layer with fixed amino groups and by its denser structure and smaller pore size. The latter necessitates partial dehydration of multivalent cations for their access to the pore space. The dependencies of Li⁺ and Mg²⁺ ion flux densities through CIMS on current density were studied during the electrodialytic extraction of Li⁺ ions from a solution simulating the composition of the natural lithium-containing brine of the Angara–Lena basin. The experimental results indirectly confirmed a significant contribution of the dehydration mechanism to the selective transport of Li⁺. Based on the values of the CIMS selective permeability coefficient (<span>({P_{{text{L}}{{text{i}}^ + }{text{/M}}{{text{g}}^{2 + }}}})</span>), energy consumption, and Li⁺ extraction degree, the range of optimal current densities in the vicinity of half the partial limiting current density of lithium ions was determined.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 5","pages":"246 - 257"},"PeriodicalIF":1.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338707","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":"Performance of Electrodialysis for Fluoride Removal: Using Overlimiting Current Conditions","authors":"C. C. N. Kunrath,&nbsp;M. A. S. Rodrigues,&nbsp;T. Benvenuti,&nbsp;A. M. Bernardes","doi":"10.1134/S2517751625600554","DOIUrl":"10.1134/S2517751625600554","url":null,"abstract":"<p>Water is essential for life, but contamination has become a significant global problem, particularly with groundwater, which serves as a vital source of drinking water for millions. One of the pollutants is fluoride, which, when present in high concentrations, can lead to serious health problems such as dental and skeletal fluorosis. Electrodialysis (ED) is an efficient and sustainable method to remove fluoride from contaminated water. This study investigated the application of electrodialysis (ED) under different electric current conditions to optimize fluoride removal efficiency. The study aims to evaluate fluoride removal both in monocomponent solutions, such as sodium fluoride (NaF), and in multicomponent solutions, represented by a real water sample collected from the Bambuí Aquifer in Bahia, Brazil. This dual approach allows for a better understanding of the electrodialysis performance in simplified systems, and in complex naturally occurring water matrices. The applied currents included both the conventional value commonly adopted in the literature, corresponding to 80% of the limiting current, and overlimiting current values, since operating in this regime can significantly impact the process, either positively, by reducing treatment time, or negatively, by increasing energy consumption and promoting precipitate formation, highlighting the need for careful optimization to maximize efficiency and system longevity. The results showed that operating at overlimiting currents can improve ion transport, significantly reducing treatment time by up to 37% in certain solutions. However, this increase in efficiency may be associated with a higher energy consumption and membrane fouling, particularly in multicomponent real water matrices. These findings suggest that although overlimiting currents can improve fluoride removal rate, careful optimization is required to balance energy efficiency and system longevity.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 5","pages":"231 - 245"},"PeriodicalIF":1.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338705","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":"Molecular Modeling of Pure and Phosphoric Acid-Doped Poly(2,5-benzimidazole)","authors":"T. S. Zyubina,&nbsp;A. S. Zyubin,&nbsp;R. V. Pisarev,&nbsp;A. V. Pisareva,&nbsp;Yu. A. Dobrovolsky","doi":"10.1134/S2517751625600712","DOIUrl":"10.1134/S2517751625600712","url":null,"abstract":"<p>Various oligomers and infinite chains of pure and phosphoric acid-doped poly(2,5-benzimidazole) (ABPBI) were studied by a quantum-chemical method within the framework of the cluster approximation with the functional ωB97XD and basis 6-31G**, taking into account periodic boundary conditions with the functional PBE and the basis of the projector-augmented plane waves PAW, and also by the molecular dynamics method MD-VASP. It was found that random orientations of ABPBI units and the presence of free rotation around a single bond connecting two monomeric segments of ABPBI lead to a minimal possibility of <i>p</i>–<i>p</i> interactions. ABPBI has a form wavy chain i.e. it has local curvatures and with energies of ∼0.1 eV can rotate around single bonds. In the case of doping with phosphoric acid, an acid-base reaction can occur in some monomer segments of ABPBI between the imidazole moieties in the polymer chain and phosphoric acid to form dihydrogen phosphate ions and protonated imidazolium cations ABPBIH⁺. When the temperature increases from 0 to 600 K, in addition to protons, acid molecules, acid residues, formed OH-fragments, and released intrastructural water also actively participate in the transport process. However, the structure of the fragments depends on the speed and uniformity of heating.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 5","pages":"288 - 300"},"PeriodicalIF":1.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338642","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":"Levulinic Acid Separation Using Hollow Fibers Supported Liquid Membrane: Effects of Impregnation Time and Coagulation Bath Temperature","authors":"Vikneswary Rajendaren,&nbsp;M. A. K. M. Zahari,&nbsp; Mohd Helmi Ab Latiff,&nbsp;Syed M. Saufi","doi":"10.1134/S2517751625600694","DOIUrl":"10.1134/S2517751625600694","url":null,"abstract":"<p>In the production of levulinic acid (LA) from biomass, creating an efficient separation method is essential to isolate LA from unreacted reactants and unwanted byproducts. One promising approach is the use of a supported liquid membrane (SLM). This study examined the performance of LA separation using a hybrid graphene/polyethersulfone hollow fiber SLM by varying the liquid membrane impregnation time from 1 to 24 h. Additionally, the hollow fiber membranes used in the SLM were fabricated at different coagulation bath temperatures (CBT), ranging from 32°C (room temperature) to 60°C, under high relative humidity (86%). The optimal impregnation time of 24 h resulted in 11.1% LA extraction and 36.6% recovery in the stripping phase without any liquid membrane leakage. Increasing the CBT promoted the formation of a dense outer layer in the fiber while reducing overall thickness and porosity. The hollow fiber membrane prepared at a CBT of 50°C exhibited a well-balanced porosity and thickness, achieving 10.1% LA extraction from a 10 g/L aqueous LA solution and the highest LA recovery in the stripping phase at 70.9%. Optimizing hollow fiber membrane properties for SLM is essential for enhancing LA extraction in biorefineries, as it improves membrane stability, increases separation efficiency, and extends operational lifespan.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"7 5","pages":"280 - 287"},"PeriodicalIF":1.6,"publicationDate":"2026-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147338627","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}