JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Ziye Wang,Guijuan Liu,Ting Yang,Yao Liang,Fangqi Zhou,Xiaohui Ju,Weixing Li
Mixed matrix membranes (MMMs) demonstrate significant potential for pervaporation applications. Nevertheless, single lamella 2D materials are prone to stacking problems in membranes, resulting in unforeseen matrix inhomogeneity and defects. Here, we propose a wafer-like membrane structure designed for ethanol dehydration. This structure features a surface modification of transition metal carbides (MXenes) with layered dihydroxides (LDHs), which effectively enlarges the interlayer spacing and ameliorates the stacking issue. The LDHs-modified MXenes were then incorporated into the sodium alginate (SA) layer. The hydrophilicity , stability and morphology of the MMM were evaluated by water contact angle measurements, swelling tests and scanning electron microscopy. The experiment results indicated the hydrophilicity and stability of the MMM were effectively improved. The novel L-M@CS MMM exhibited outstanding dehydration performance for ethanol solution, with the membrane containing 0.4 wt % LDHs-modified MXenes achieving the highest permeation flux of 1377 g/(m 2 ·h) and the optimal separation factor up to 1650.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 16
·
IF 1.866
Jia Ming Zhu,Ge Li,Lan Ying Jiang
A series of polysiloxaneimide (PSI)/polyetherimide (PEI) composite hollow fibers were fabricated by coextrusion and phase inversion. The hydrophobic PSI outer layer was set as the selective layer which was supported by the PEI inner layer. The PSI was synthesized by polycondensation of 3,3′,4,4′-Biphenyltetracarboxylic Dianhydride (BPDA) with amino siloxane X-22-161A and a chain extender, 1,3-Bis (3-aminopropyl) −1,1,3,3-tertramethyldisiloxane (BATS). It was found that the macroscopic uniformity of PSI layer was dependent on the dope formulation, coagulant composition and dope flow rate: (1) the higher similarity degree of the solvent(s) for different layers in terms of solubility parameters, (2) the utilization of surfactant as a component in the water coagulant, and (3) higher flow rates of the outer layer dopes, led to the formation of more uniform and smoother PSI outer layer. The maximum outer layer thickness was around 2 μm. The bulk of the PEI layers were porous with finger like macrovoids. The outer surface of the inner PEI layer for some batches of the hollow fibers was confirmed to be porous. The original dual-layer hollow fibers showed poor pervaporation performance. Post treatment was applied to cure the hollow fiber, delivering composite membranes with performance dominated by the coating material of PDMS. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43324.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMER
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2019
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IF 3.771
Tao Xi,Yingying Lu,Xinyu Ai,Lin Tang,Lulu Yao,Wentao Hao,Peng Cui
Benzene and cyclohexane are both important raw materials in polymer chemical industry. However, they are hard to be separated via the traditional distilling methods. In this work, ionic liquid copolymerized waterborne polyurethane (IL-co-PU) membranes were proposed for the pervaporation separation of benzene/cyclohexane mixtures. The results, including swelling rate, diffusion coefficients , partial flux, permeance and selectivity, showed that the IL-co-PU membranes could preferentially absorb and transfer benzene molecules rather than cyclohexane . The ILs might have functioned as facilitated transporter in the membranes. The permeation flux and separation factor of the IL-co-PU membranes increased simultaneously with the increase of IL contents. That is, these membranes had no trade-off between permeability and selectivity, which most of the polymer membranes suffered. With consideration of the good performance and easy handling property of the IL-co-PU membranes, they are of great potential in pervaporation separation of benzene/cyclohexane mixtures.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Ling Liu,Yanbo Li,Man Xu,Cunwen Wang
Two-dimensional Co ultrathin metal–organic framework nanosheets (Co-UMOFNs) were synthesized and blended into poly (ether block amide) (PEBA) to prepare composite mixed matrix membranes on PVDF supports for the pervaporation of phenol aqueous solution. The membranes were characterized by XRD, ATR-IR, TGA, CA and SEM measurements. Effects of the Co-UMOFNs loading, feed temperature and feed concentration on phenol separation performance were investigated. The results showed that Co-UMOFNs have a two-dimensional layered morphology and have good compatibility with the PEBA. A “brick and mortar” architecture morphology was achieved after incorporating Co-UMOFNs into the PEBA membrane. The amorphous PE segments in the PEBA were turned into a crystalline structure, restricting the motion of PE segments. The filling of Co-UMOFNs slightly improved the thermal stability and hydrophobicity as well. With the increase of the Co-UMOFNs loading from 0% to 40%, the phenol separation factor increased from 27 to 45, and the total flux decreased from 1.2 kg m -2 h - 1 to 0.42 kg m -2 h - 1 , when separation of 1000 ppm phenol solution at 70 °C. The interlayer galleries induced by the Co-UMOFNs stacking increased the tortuosity, and the crystalline structure of the Co-UMOFNs-PEBA improved the energy barriers of water penetration. Therefore the water flux was inhibited and the phenol separation factor increased. Depression of water permeation can be another protocol to prepare high-performance organophilic pervaporation membranes.
研究领域:
材料科学
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化学工程
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膜技术
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Guozhen Liu,Song Liu,Kang Ma,Haoyu Wang,Xiaoyue Wang,Gongping Liu,Wanqin Jin
Recently, owing to their excellent structural and transport properties, two-dimensional membranes have attracted tremendous interest for their potential application in molecular separation. In this work, a new type of functionalized Ti2CTx MXene membrane was proposed by introducing different kinds of polyelectrolytes to regulate the membrane physicochemical structure for pervaporation dehydration of isopropanol dehydration. The morphology, physical, and chemical properties of powders and MXene-based membranes were studied by SEM, AFM, FTIR, XPS, and contact angle test. Meanwhile, the effect of polyelectrolyte functionalization on the MXene membrane performance for isopropanol dehydration was also studied. The results showed that the poly(diallyldimethylammonium chloride) (PDDA) functionalized MXene membrane possesses the highest separation performance owing to the optimized electrostatic effect and hydrophilicity. Besides, other influencing factors including PDDA concentration, MXene loading, and operating conditions on the MXene membrane performance were also systematically investigated. The developed PDDA functionalized MXene membrane showed excellent separation performance for dehydration of 90 wt % isopropanol/water at 50 °C with a total flux of 1237 g/m2·h and separation factor of 1932, showing great potential in application of solvent dehydration.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2011
·Vol. 29
·期 3
·288-295
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IF 0.478
Xu Gao-fei,Zhu Wei-pu
P(AA-MA) copolymers composed of acrylic acid and methyl acrylate with different molecular weights and sequence structures were synthesized by combination of ATRP and selective hydrolysis. These copolymers were used as membrane materials to separate benzene/cyclohexane mixture by pervaporation. The effects of molecular weight and sequence structure of the copolymers on the pervaporation performance were investigated in detail. For the random copolymers, the permeate flux decreased rapidly with the increasing of molecular weight. The separation factor was also influenced by the molecular weight, which was changed from no selectivity to cyclohexane selectivity with increasing the molecular weight. Contrarily, the block copolymer membrane showed good benzene selectivity with separation factor of 4.3 and permeate flux of 157 g/(m 2 h) to 50 wt% benzene/cyclohexane mixture.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 78
·63545-63552
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IF 3.84
Ping Zhang,Pei-Yao Zheng,Feng-Yang Zhao,Quan-Fu An,Cong-Jie Gao
Recovery of ethanol from a low concentration aqueous solution is a critical step for biofuel production. Pervaporation as an energy-efficient separation technology is attracting great attention in ethanol retrieving. Here we introduce polyelectrolyte–surfactant complexes (PESCs) as membrane materials for ethanol recovery from aqueous solution. PESCs with a controlled degree of complexation (DC) were prepared by mixing polyacrylic acid sodium (PAANa) and hexadecyltrimethylammonium bromide (CTAB) at different pH values. Both the PESCs and their membranes (PESCMs) were characterized. Pervaporation data show that PESCMs could selectively transport ethanol molecules in the feed, and the PESCM with the highest hydrophobicity gives the optimum performance in terms of selectivity. For example, the most hydrophobic PESCM (DC 0.79) features the optimum separation factor of 5.38 coupled with a high flux of 4.23 kg m−2 h−1 in processing a 5 wt% ethanol–water feed mixture at 30 °C. The PESCM, which is low cost in terms of starting materials and manufacture engineering, represents an alternative membrane system with considerable potential for biofuel production.
研究领域:
生物工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 14
·7792-7799
·
IF 2.936
Tao Xi,Lin Tang,Wentao Hao,Lulu Yao,Peng Cui
Blending an aromatic-selective ionic liquid (IL, namely 1-ethyl-3-methylimidazolium hexafluorophosphate, [emim][PF6]) with waterborne polyurethane (WPU) enabled us to obtain [emim][PF6]-modified waterborne polyurethane composite membranes. We characterized the structure and properties of the [emim][PF6]/WPU composite membranes by ATR-FTIR, DSC, UV, SEM, EDX, swelling tests, and pervaporation testing. Characterization of the change in the morphology of the membranes in response to the IL loading indicated that a preferential interaction between the IL and soft segments of WPU was induced by hydrogen bonding. This interaction inhibited a potential interaction with benzene (Bz), which initially lowered the permeability. However, at high IL loading, the IL incorporation became ineffective owing to macrophase separation, which caused an increase in the permeability, as indicated by the SEM results. Swelling testing of the [emim][PF6]/WPU composite membranes showed that the membranes exhibited preferential adsorption of Bz, and the swelling degree of the composite membranes in Bz solvent increased from 58% to 98% and remained almost constant in cyclohexane solvent as the IL content was increased. The [emim][PF6]/WPU composite membranes enhanced the separation selectivity of Bz/Cy for an IL loading < 10 wt%. The best separation factor was 8.4, and the total flux was 0.19 kg (m2 h)−1 (50 wt% Bz/Cy mixtures at 50 °C) at w([emim][PF6]) : w(WPU) = 10 : 100. In addition, the composite membrane exhibited excellent stability over long-term operation. These results demonstrated that the [emim][PF6]/WPU composite membranes could be effective for separation of Bz/Cy mixtures by the pervaporation method.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2016
·
IF 3.349
Chen Zhou,Junjie Zhou,Aisheng Huang
In this study, dense and phase-pure zeolite FAU membrane has been prepared on α-Al 2 O 3 tube using a seeding-free synthesis strategy. 3-aminopropyltriethoxysilane (APTES) acts as a molecular linker for anchoring the FAU precursors onto the support surface to promote the nucleation and the formation of a thin, well intergrown zeolite FAU membrane. The obtained membranes are employed for desalination of seawater by pervaporation . With the increase of the synthesis time from 12 h to 24 h at 75 °C, the water fluxes of the zeolite FAU membranes reduce from 4.22 kg m −2 h −1 to 3.42 kg m −2 h −1 at 75 °C due to the increase of the thickness of the zeolite FAU membranes, while the ions rejections increase from 99% to 99.9%. For the zeolite FAU membrane which was prepared at 75 °C for 20 h, with increasing the feed temperature from 30 °C to 90 °C, the water fluxes increase from 0.96 kg m −2 h −1 to 5.64 kg m −2 h −1 , and all the ions rejections of the zeolite FAU membrane are above 99.8%. Note that the zeolite FAU membranes show high separation performances for seawater desalination, even for desalination of 10 wt% seawater, the developed zeolite FAU membranes are very promising in seawater desalination.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Qin Wu,Yan Sun,Wei Wang,Shuyao Tian,Mengjie Ouyang,Kangcheng Chen,Daxin Shi,Yaoyuan Zhang,Hansheng Li,Zhiping Zhao
A series of multiblock polydimethylsiloxane -b- polyimides copolymers, including non-fluorinated (PDMS -b- PI) and fluorinated polyimides (PDMS -b- FPI), were successfully prepared from pyromellitic dianhydride and 4,4′-(4-aminophenoxy) biphenyl, 4,4′-(hexafluoroisopropyl) diphenyl dicarboxylic anhydride and 2,2′-bis(trifluoromethyl)benzidine, respectively. The chemical structures of these block polymers were determined with FTIR. Self-supporting membranes were prepared from the copolymers using a solution coating method. The physicochemical properties, pervaporation properties and thermal stability of the block polymer membranes were studied. The results showed that the mechanical properties of PDMS -b- FPI and PDMS -b- PI membranes increased with an increase in the FPI or PI content in the copolymer, where the tensile strengths and moduli increased, and the elongations at break decreased. The swelling of the PDMS -b- FPI and PDMS -b- PI membranes in ethyl acetate increased with an increase in the PDMS content, and membranes with PDMS contents of less than 50% were stable. TEM showed that the block copolymers formed microphase separated structures. SAXS showed that the chain segment spacing increased with the increase of PDMS content, and the chain segment spacing of PDMS -b- FPI was larger than that of PDMS -b- PI. In the pervaporation tests using a feed solution containing 5 wt% ethyl acetate at 40 ℃, the separation factor( α ) of the PDMS -b- PI-50 membrane was 31, and the total flux( J ) was 924 g·m −2 ·h −1 . Using the same pervaporation test conditions, the α of the PDMS -b- FPI-50 membrane was 31, and the J was 1267 g·m −2 ·h −1 . Both the PDMS -b- PI-50 and PDMS -b- FPI-50 membranes were found to be stable during the separation tests, and the α and J did not change significantly after 150 min of operation.
研究领域:
材料科学
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化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Meisheng Li,Jie Wang,Shouyong Zhou,Ailian Xue,Feiyue Wu,Yijiang Zhao
Highly water-selective poly(vinyl alcohol) (PVA)/polyacrylonitrile (PAN) pervaporation membranes were prepared by combining self-aggregation crosslinking reactions for PVA through ammonium persulfate (APS) initiations and interface physicochemical structure regulations for PAN supports. The membrane physicochemical properties were tested and the pervaporation performances were investigated by separation of 95 wt% ethanol aqueous. The results showed that the swelling degree and crystalline region of PVA membranes decreased with the increasing of APS content. On the contrary, the gel fraction of PVA membranes increased. Interestingly, the interface physicochemical structure between the PAN support and PVA separation layer played an important role in pervaporation processes. When the PAN supports were treated by sodium hydroxide (NaOH) and tannic acid (Ta), the water fraction in permeation always kept over 99.99 wt%, especially after Ta treatment. After optimization, the membrane based on PVA content of 8 g, 1.25 g self-crosslinking agent of APS and spin-coated onto H 2 -PAN (PAN modified by NaOH and Ta respectively), showed good permeability-selectivity and long-term performance stabilities. The total flux and water content ratio in permeation were 117.6 g/(m 2 h) and 99.99 wt% respectively by using the PVA 8-1.25 /H 2 -PAN membrane. After running for 120 h, the membranes still displayed a good stability for the ethanol dehydration in the pervaporation process. Importantly, the ethanol solution could be concentrated to over 99.99% using this polyacrylonitrile-based self-aggregation crosslinked poly (vinyl alcohol) pervaporation dehydration membrane.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2026
·
IF 9.8
Zilin Pan,Feng Ye,Shuanshi Fan,Yanhong Wang,Xuemei Lang,Lisha Lu,Gang Li
LiBr-H₂O absorption chillers offer significant advantages in cooling applications; however, their widespread implementation has been severely limited by their large weight and size. The miniaturization of their key components is therefore critical to expanding their practical applications. This study presents a novel desorber design that employs a pervaporation process to concentrate LiBr solutions using DDR zeolite membranes. High-quality DDR zeolite membranes were fabricated via a heteroepitaxial growth process, utilizing CHA rather than DDR zeolite seeds, owing to the successful suppression of the SGT competitive phase during membrane synthesis. The resulting DDR zeolite membrane exhibited a water flux ranging from 0.16 to 1.56 kg·m −2 ·h −1 and a LiBr rejection exceeding 99.9 % for 20–60 wt% LiBr solutions at temperatures of 20–80 °C. The activation energy for water permeation decreased from 20.64 to 9.69 kJ·mol −1 as the LiBr concentration increased from 20 to 60 wt%, which stemmed primarily from the combined effect of the thermodynamic properties of LiBr solutions and the adsorption behaviors of the membrane. Moreover, the DDR zeolite membrane demonstrated excellent stability in the pervaporation dehydration of LiBr solutions, even at 80 °C, highlighting its potential for use in desorbers for LiBr-H₂O absorption chillers.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）