JOURNAL OF MEMBRANE SCIENCE
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2015
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IF 5.056
Shengnan Yu,Zhongyi Jiang,He Ding,Fusheng Pan,Baoyi Wang,Jing Yang,Xingzhong Cao
Hybrid membranes with polydimethyl siloxane (PDMS) as the polymer matrix and metal organic framework (MOF) CuBTC ([Cu 3 (BTC) 2 ]) as the filler were fabricated and applied in pervaporative separation of thiophene from model gasoline. CuBTC submicroparticles with size of 0.2–0.3 μm were synthesized through a facile method at room temperature. The morphology, crystal structure and pore parameters of CuBTC, together with the morphology, functional groups, thermal and mechanical property, free volume characteristics, sorption and separation performance of PDMS–CuBTC hybrid membranes were studied. Primary functions of CuBTC particles are summarized as follows: (i) the channels of CuBTC provide expressways with low resistance for the transport of permeates; (ii) the submicroparticles interfere with the packing of PDMS chains, generating extra free volume of the membrane; (iii) the active metal sites of CuBTC facilitate the transport of thiophene; and (iv) the channels of CuBTC sieve thiophene from the bulk of model gasoline. As a result, the normalized flux and selectivity of PDMS membranes are elevated simultaneously. The optimal separation performance is achieved when the weight ratio of normal CuBTC to PDMS reaches 8%, with a permeation flux of 194.2 kg μm/(m 2 h) and an enrichment factor of 5.2 (increase by 100% and 75% compared with PDMS control membrane, respectively).
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
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IF 3.359
Jie Wang,Meisheng Li,Shouyong Zhou,Ailian Xue,Yan Zhang,Yijiang Zhao,Jing Zhong,Qi Zhang
Graphitic carbon nitride (g-C 3 N 4 ) is an innovative soft two-dimensional (2D) nanomaterial. Due to its lamellar structure, similar to graphite layers, g-C 3 N 4 has attracted significant interest as a new class of filler for the fabrication of novel polymeric nanocomposite membranes. In this study, highly water-selective hybrid membranes with excellent water/ethanol separation performance and superior water channels were fabricated by incorporating g-C 3 N 4 nanosheets into a poly(vinyl alcohol) (PVA) matrix. g-C 3 N 4 was synthesized via thermal oxidation “etching”, using melamine as a precursor. The ultrathin and nanoporous structures formed were characterized through transmission electron microscopy, Fourier transform infrared spectra, and X-ray diffraction. Due to the strong interfacial interactions among g-C 3 N 4 , succinic acid (Sa) and the PVA matrix, the hybrid nanocomposite membranes showed both high swelling resistance and mechanical stability. Furthermore, the addition of g-C 3 N 4 can significantly improve the membrane’s hydrophilicity and heat-resistance properties. Importantly, membrane permeability improved greatly because the ordered alignment and the regular pore structure of g-C 3 N 4 resulted in ordered water channels for rapid transportation of water molecules. The total flux and separation factor of this new membrane can reach about 6332 g/(m 2 h), and 30.7 for 90% wt.% ethanol, respectively. Compared with the cross-linked pure PVA membrane (2337 g/(m 2 h) and 11.2), the flux and separation factor can be improved simultaneously. Namely, the composite membrane can break the “trade-off effect” effectively. Furthermore, the nanocomposite membrane exhibited an excellent long-term operating stability. After operating for over 120 h with a 90 wt% ethanol/water system at 75 °C, the total flux and separation factor remained at their initial values. This is a step forward in the application in pervaporation separation processes of organic-inorganic hybrid membranes with superior properties incorporating 2D porous fillers (e.g., g-C 3 N 4 ).
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 60
·55272-55281
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IF 3.289
Chengyun Gao,Minhua Zhang,Fusheng Pan,Lingtao Wang,Jiayou Liao,Teng Nie,Jing Zhao,Keteng Cao,Lei Zhan,Zhongyi Jiang
In this study, hybrid membranes incorporated with sulfonated carbon molecular sieves were fabricated and utilized for pervaporation dehydration of an acetone/water mixture. First, carbon molecular sieves (CMS) were synthesized via a hard template method, and sulfonated by concentrated H2SO4 to prepare sulfonated carbon molecular sieves (SCMS). The pore structure, surface properties and morphological features of CMS and SCMS were examined by XRD, FT-IR, TEM, EDX, nitrogen adsorption–desorption and HRTEM. The results showed that the obtained CMS had an ordered mesoporous structure with cylindrical channels and large surface area. After sulfonation, the surface properties of CMS changed from hydrophobic to hydrophilic. Then, SCMS with different contents were incorporated into a chitosan (CS) matrix to fabricate CS-SCMS hybrid membranes. The incorporation of SCMS can simultaneously create more water transportation pathways due to the ordered mesoporous structure and increase the number of hydrophilic sites due to the sulfonic acid groups within the membranes. When the content of SCMS was 2 wt%, an optimum separation performance with a separation factor of 832 and a permeation flux of 1.81 kg m−2 h−1 was acquired, which was increased by 2 times for the separation factor and 1.67 times for the permeation flux compared with those of the pure CS membrane. Meanwhile, the hybrid membrane showed good long-term stability.
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高影响因子
ACS Applied Polymer Materials
·
2024
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IF 4.4
Yadi Zhang,Haikuan Yuan,Xinyi Chen,Zhenlin Jiang,Jie Lu,Fan Xin
MXene has a multilayer structure, which can be peeled and layered into single or multilayer nanosheets, and it possesses multiple functional groups that can be easily modified. MOF-303, a kind of metal–organic framework material, was synthesized by the solvent hydrothermal method using aluminum ion as the center metal and 3,5-pyrazole dicarboxylic acid as the organic ligand. In this paper, MOF-303 was grown in situ on Ti3C2Tx MXene to synthesize the MXene@MOF-303 composite, which combined the advantages of both MXene and MOF-303. Using the MXene@MOF-303 composite as blending fillers and a polyacrylonitrile (PAN) ultrafiltration (UF) membrane as the substrate, an MXene@MOF-303/poly(vinyl alcohol) (PVA)/PAN composite membrane was fabricated. The composites and membranes were characterized by FTIR, XRD, SEM, and the pervaporation desalination of the composite membrane was also tested. The experimental results showed that the incorporation of MXene@MOF-303 composites improved the separation performance of the PVA membrane. The MXene@MOF-303/PVA/PAN composite membrane, loaded with 0.5 wt % of MXene@MOF-303, achieved a high flux of 15.87 kg·m–2·h–1 and a rejection of 99.84% when desalinating 3.5 wt % NaCl solution at 35 °C by pervaporation.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yanqiu Wang,Tianheng Wang,Shaobin Wen,Liyuan Fan,Mengshi Chen,Yaqi Dong,Qiang Zhang
Pervaporation technology is suitable for separating organic solvent azeotropic mixtures or isomers that are challenging for traditional distillation methods. However, the conventional methods to fabricate pervaporation membranes often lead to limitations in membrane performance and stability, such as the restrictiveness of material selection and the high costs of manufacturing. Herein, we utilized commercially available inexpensive monomers CE (3,4-Epoxycyclohexylmethyl) and DOX (3-ethyl-3-[(3-ethyloxetan-3-yl)methoxymethyl]oxetane), along with the sulfonium salt photo-initiator (Ar6S 2+ SbF 6- ), to fabricate pervaporation membranes through cationic photopolymerization, resulting in separation layers enriched with ether groups. The resulting pervaporation membranes were employed to separate ethanol/n-hexane and ethanol/cyclohexane azeotropes formed during the production of ethyl acetate. The separation efficiency was significantly enhanced compared to the original PVDF membranes, achieving a separation factor of up to 162.81 for ethanol/n-hexane azeotrope and 41.89 for ethanol/cyclohexane azeotrope. During the 110-hour prolonged operation test, the membranes demonstrated exceptional tolerance and long-term stability against different organic solvents.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 2
·e56356
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IF 2.7
Rongying Xia,Zhixiu Yang,Dayu Sun,Ziqi Wang,Mingzhu Yao,Huijun Liu,Lei Yang,Guanghui Ma,Lijing Gao,Ruiping Wei,Guomin Xiao,Xiaomei Pan
Achieving satisfactory separation of N, N-Dimethylformamide (DMF)/water is still challenging in industrial wastewater treatment. To address this issue, a novel method involving pervaporation (PV) separation using polyvinyl alcohol/chitosan (PVA/CS) blend films is proposed. Various characterization methods confirmed the strong compatibility between PVA and CS, and the blending improved their mechanical properties and thermal stability. Heat treatment significantly reduced the swelling degree of the membranes. In a binary aqueous system with low concentrations of DMF, controlled separation can be achieved by adjusting the blending ratio of PVA to CS. The membranes exhibited preferential selectivity for DMF when the CS content is 40–75 wt%, which allowed for the concentration and recovery of DMF. At 20 °C with a feed of 10 wt% DMF solution, 2 h heat-treated PVA/CS-50 membrane exhibited the best performance, which could be attributed to its strong hydrogen bonding force, with a total flux of 484.09 g m −2 h −1 and a separation factor of 5.41 for DMF. The PVA/CS blend membranes exhibit excellent acid and alkali resistant and are promising candidates for the separation and recovery of DMF from industrial wastewater by membrane technology.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2018
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IF 3.306
Jie Wang,Meisheng Li,Shouyong Zhou,Ailian Xue,Yan Zhang,Yijiang Zhao,Jing Zhong
Highly water-selective hybrid pervaporation membranes with excellent water/ethanol separation performance and superior water channels were fabricated by incorporating graphitic carbon nitride (g-C 3 N 4 ), activated g-C 3 N 4 (O-g-C 3 N 4 ) and polydopamine modified g-C 3 N 4 (PDA@O-g-C 3 N 4 ) nanosheets into poly(vinyl alcohol) (PVA) matrix. The nonselective polymer/inorganic interface channels between PVA and g-C 3 N 4 , O-g-C 3 N 4 and PDA@O-g-C 3 N 4 in hybrid membranes were controllable constructed through hydrogen bonds, rigid and flexible chemical bonds, respectively. The membrane performances were tested in the pervaporation (PV) process for the dehydration of 90 wt% ethanol/water mixtures at 75 °C. The results revealed that with the increase of binding force among polymer/inorganic interface, from hydrogen bonds (CPVA-g-C 3 N 4 ), to rigid (CPVA-O-g-C 3 N 4 ) and flexible chemical bonds (CPVA-PDA@O-g-C 3 N 4 ), the total flux decreased from 4634 to 2328 g/(m 2 h) and the separation factor increased from 32.4 to 57.9. It is implied that the nonselective polymer/inorganic interface channels were controlled successfully. Meanwhile, compared with the pure cross-linked PVA (CPVA) membrane (total flux 2325 g/(m 2 h) and separation factor 18.7), incorporation of g-C 3 N 4 , O-g-C 3 N 4 and PDA@O-g-C 3 N 4 could all lead to an increase of surface hydrophilicity of the CPVA membranes along with an increase in membrane tortuosity and membrane water-selective channels that was favorable to the selective permeation of water molecules. Namely, these new hybrid membranes can break the “trade-off effect” effectively. Moreover, due to the ordered alignment of g-C 3 N 4 , O-g-C 3 N 4 and PDA@O-g-C 3 N 4 nanosheets and the strong interfacial interactions among these nanosheets, succinic acid (Sa) and the PVA matrix, the hybrid composite membranes showed both high swelling resistance and mechanical stability.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Guoshu Gao,Yumeng Zhao,Peng Zhu,Haiou Liu,Xiongfu Zhang,Yu Guo,Guohui Yang
The Co-gallate MOF membrane exhibits great potential for separating MeOH/MTBE mixtures due to its regular pore size, exceptional stability, and high hydrophilicity. Nevertheless, the rapid nucleation and growth rate of the Co-gallate crystals in the synthesis solution cause poor nucleation on the substrate surface, which presents a significant challenge for the preparation of continuous Co-gallate membranes. In this study, we presented a cobalt carbonate hydroxide nanowire array (Co-NWA)-induced strategy that enabled the rapid and defect-free synthesis of tubular Co-gallate membranes within just 1 h. The presynthesized Co-NWAs on the substrate played as nucleation centers and anchoring sites, facilitating robust membrane formation. The effects of various synthesis parameters on the crystal morphology and membrane compactness were systematically examined. The optimized Co-gallate membrane demonstrated excellent pervaporation performance, with a permeation flux of 2.03 kg m–2 h–1 and a separation factor of 6711 for a 14.3/85.7 wt % MeOH/MTBE mixture, maintaining high performance for over 100 h, indicative of its remarkable long-term stability. This Co-NWA-induced synthesis strategy presents a promising approach for the industrial-scale application of Co-gallate MOF membranes and the design of other MOF membranes, thereby advancing their utility in requisite liquid separation processes.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Hao Zhang,Zhikang Li,Feng Xiao,Huabin Han,Yanhui Wu
High-performance pervaporation membranes play a crucial role in the separation of biobutanol. Graphene oxide (GO) shows remarkable potential in membrane separation applications due to its tunable interlayer channel, good hydrophilicity and excellent surface modifiability. However, the narrow d-spacing between GO layers and the weak interlayer interaction forces impose limitations on its application in alcohol permselective pervaporation. Herein, porous graphene oxide (PGO) was prepared via etching of the surface functional groups. Subsequently, 4-dodecylaniline was covalently grafted with PGO nanosheets to fabricate C12H-PGO/PEBA mixed matrix membranes (MMMs) featuring in-plane and interlayer dual transport channels. The introduction of long alkyl chains not only enlarges the d-spacing of PGO and augments its hydrophobicity but also bolsters the mechanical integrity of the framework. At 40°C, the 1 wt% C12H-PGO/PEBA membrane exhibited a 25.4% increase in separation factor and a 106.9% improvement in permeation flux compared to the pristine PEBA membrane. In addition, the adsorption and diffusion behaviors of GO/PEBA, PGO/PEBA, and C12H-PGO/PEBA were investigated using Grand Canonical Monte Carlo (GCMC) and Molecular Dynamics (MD) simulations. The results reveal that C12H-PGO incorporation enhances affinity toward butanol molecules while suppresses water diffusion, accounting for the improved separation performance. This microstructural modification strategy of GO paves the way for the development of novel butanol pervaporation membrane.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 6
·125570
·
IF 7.5
Yan Zhang,Guannan Ren,Hongfen Zuo,Mingjia Liao,Ningrui Zhang,Zhou Xu,Genghao Gong
An interlayer regulates organosilica deposition on porous polymer supports. • A 150 nm organosilica layer was obtained after two spray cycles. • The membrane achieved a flux of about 1.0 kg m⁻² h⁻¹ for DMF dehydration. • The membrane maintained relatively stable performance over 50 h. Pervaporation dehydration of N,N-dimethylformamide (DMF) is challenging because low-viscosity organosilica sols can penetrate porous polymer supports during selective-layer deposition. In this work, a polyarylate (PAR) interlayer was introduced onto a porous poly(ether ether ketone) (PEEK) support by interfacial polymerization to regulate the deposition of a bis(triethoxysilyl)ethane (BTESE)-derived organosilica layer by ultrasonic spray coating. Cross-sectional SEM observations showed that the PAR interlayer reduced BTESE-sol penetration into the porous PEEK support and facilitated the formation of a relatively thin BTESE-derived layer. The selected membrane prepared with two spray-coating cycles exhibited a BTESE-layer thickness of approximately 150 nm. For a 90 wt% DMF/water feed at 50°C, the membrane achieved a total permeation flux of approximately 1.0 kg m⁻² h⁻¹ with a separation factor of 3–4. During 50 h of continuous operation, the permeation flux decreased initially and subsequently remained relatively stable, while the separation performance showed no pronounced deterioration under the tested conditions. Additional pervaporation experiments with NMP/water and DMAc/water mixtures showed different permeation and separation behaviors. Overall, the results indicate that the PAR interlayer can regulate BTESE-sol deposition on the porous PEEK support and facilitate the fabrication of a thin organosilica composite membrane for pervaporation dehydration under the investigated conditions. Download: Download high-res image (287KB) Download: Download full-size image
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高影响因子
Journal of Membrane Science Letters
·
2022
·
IF 0
Yunfei Xing,Yunlong Xue,Dujian Qin,Pengbo Zhao,Pei Li
Although pervaporation (PV) membranes based on crosslinked polyvinyl alcohol (PVA) exhibit high desalination performance, the thermal crosslinking process often takes several hours. Here, we report a microwave assisted method to reduce the crosslinking duration. Moreover, to the PVA crosslinking system, a MOF particle, UIO-66, was added to increase the microwave absorbing efficiency and improve the desalination property. As a result, the PVA crosslinking time decreased to 2 min and the water flux increased by 67% compared with the plain crosslinked PVA membrane.
研究领域:
材料科学
·
环境工程
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 129
·期 6
·3473-3481
·
IF 1.395
Wan-Zhong Lang,Hai-Yan Niu,Ya-Xin Liu,Chun-Xia Liu,Ya-Jun Guo
The waste perfluoro-ion-exchange membranes (PFIEMs) in chlor-alkali industry were regenerated and used to the separation of dimethyl carbonate (DMC)/methanol (MeOH) mixtures by pervaporation process. The energy-dispersive spectrum (EDS) demonstrates that the impurities on the surfaces of waste PFIEMs can be effectively cleared by the regeneration process. The degree of swelling, sorption, and pervaporation properties of the regenerated PFIEMs with different counter ions were investigated. The results indicate that the counter ions of PFIEMs conspicuously influence the degree of swelling, sorption, and pervaporation properties for DMC/MeOH mixtures. The degree of swelling and solubility selectivity both decreases with the alkali metal counter ions in the sequence: Li + > Na + > K + > Cs + . The degree of swelling increases with MeOH concentration increasing in feed liquid. The pervaporation measurements illustrate that the permeation flux decreases and the separation factor increases with the rising in ion radius of counter ions. The increase of feed concentration (MeOH) and feed temperature is advantageous to improve permeation flux while at the cost of separation factor decreasing. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
研究领域:
高分子材料
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化学工程
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膜科学与技术
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环境化工
·
分离科学
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