Results in Engineering
·
2024
·
IF 6
Thi Thi Mar,Yunlong Xue,Yu Chang,Zijian Yu,Zhongxiao Du,Bing Cao,Rui Zhang
Pervaporation emerges as a promising technique for brine treatment. In this investigation, we employed a PVDF substrate layer and applied various coating solutions using a simple spray technique to produce a composite pervaporation membrane. The composite membrane's chemical structure, morphology, hydrophilicity, swelling property, surface roughness, and crosslinking conditions were thoroughly investigated. Notably, the PVDF/PEI/P(SS-MA) composite membrane exhibited outstanding desalination performance, demonstrating high salt rejection and flux of 308.7 ± 13.8 kg m −2 h −1 when subjected to a 3.5 wt% sodium chloride solution. Even at an elevated brine concentration of 20 wt%, the membrane maintained a commendable flux of 88.76 ± 5.4 kg m −2 h −1 at 72 °C. These findings underscore the efficacy of the developed composite membrane for brine desalination applications.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhongming Zhang,Yijun Liu,Zhengda Lin,Rui Wu,Rui Fang,Weipeng Guo,Jie Yao
Given the increasing concerns for both the environment and human health, the treatment of wastewater containing phenolics has emerged as a pressing yet daunting matter. In this work, the mixed matrix membranes (MMMs) with exceptional performance have been created by introducing controllable morphology and structure zeolitic imidazolate framework-71s (ZIF-71s) into polyether block amide (PEBA) matrix for the purpose of phenol-water separation. The impacts of ZIF-71s dimension and ZIF-71s loading amount on the separation performance were comprehensively analyzed, as well as operational temperature and operational concentration on the separation performance. The crystal transformation of three-dimensional ZIF-71K nanoparticles into two-dimensional ZIF-71P nanosheets was accomplished by altering the modulators in aqueous system. The presence of ZIF-71s could lead to a decrease in water flux, while the phenol permeation flux was essentially unaffected. The filling of two-dimensional ZIF-71P nanosheets established a classic “brick-and-mortar” structure within the polymeric bulk, which resulted in the enhancement of tortuous pathways and energy barriers for water penetration, hence further boosted the membrane selectivity. For an operating temperature of 50 °C and a phenol concentration of 1000 ppm, the ZIF-71P/PEBA-21 MMMs exhibited separation performance with total permeate flux and separation factor of 911.10 g·m −2 ·h −1 and 18.96, while the ZIF-71K/PEBA-21 membrane demonstrated total permeate flux and separation factor of 965.49 g·m −2 ·h −1 and 17.74. And the MMMs presented a superior separation performance in comparison with the PEBA/PVDF membrane. On top of that, the resultant MMMs also demonstrated promising long-term stability as phenol enrichment methods, which holds significant promise for implementation in the recovery of phenol from relevant industrial wastewater.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Li Lu,Yuzhen Li,Yehai Yan,Huifang Wang,Peng Li,Jian Cui,Nataliia Golub,Ailin Gao,Shuai Zhao,Guangfa Zhang
High-performance mixed-matrix membranes (MMMs) featuring with superior permselectivity and easy processability are highly demanded toward the effective pervaporation recovery of bio-alcohols, however their development still remains a huge challenge. In this work, a self-standing and exceptional zeolitic imidazolate framework (ZIF-8)@Aramid nanofiber/Polydimethylsiloxane (Z@A/P) MMM was constructed via an ingenious “three-dimensional (3D) connecting MOFs pre-forming & polymer backfilling” coupling strategy. The preformed hybrid aerogel network (ZIF-8@Aramid nanofiber) not only exhibited a desirable interfacial compatibility with PDMS but also facilitated ZIF-8 particles to form interconnected 3D long-range consecutive MOF phases across the MMM. Moreover, benefiting from the combination of highly permeable and selective molecular inner channels of ZIF-8 nanoparticles along with their formed continuous and fast transport pathways deriving from the long-range connected assembly phases, the pervaporation performance of the resulting MMMs was greatly enhanced compared to that of physical blending-obtained MMM counterpart. Particularly, an excellent total flux of 935 g m −2 h −1 along with a high separation factor of 19.6 was achieved for the optimized Z@A/P4 MMM even with a relatively low loading of 4.9 wt% for pervaporation recovery of n -butanol from its 1.5 wt% aqueous solution. Therefore, this novel fabrication strategy opens up a new avenue to achieve the high-performance MMMs with the 3D interconnected long-range consecutive MOF phases across the membrane toward the efficient bio-alcohols recovery and other related fields.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xu Zhang,Lulu Xiao,Guoliang Zhang,Lusheng Xu,Zehai Xu,Qin Meng
In this study, stable and non-defective multilayer polydimethylsiloxane (PDMS) composite pervaporation mixed matrix membranes incorporated with in-situ transformed metal organic frameworks was successfully synthesized via ligand vapor phase infiltration and spin-coating. Metal zinc sources were uniformly distributed in PDMS which were in-situ transformed into homogeneous zeolitic imidazolate framework-8 (ZIF-8) nanoparticles, effectively alleviating the aggregation of ZIF-8. Thermal cross-linking of PDMS and the formation of MOFs occurred simultaneously, omitting the complicated preparation and re-dispersion steps of MOF nanoparticles. MOF nanoparticles and PDMS formed a more stabilized composite structure by in-situ transformation, in which PDMS and metal of MOFs can interact with the - Si - O - of silane coupling groups on membrane surface to construct solid multilayer composite membrane, ensuring long-term stability. Moreover, with the aid of hydrophobic interlayer, polymer infiltration into channels of substrate was restricted and casting solution spread out smoothly, facilitating the formation of defect-free PDMS selective layer. Various techniques including Attenuated Total Reflection-Fourier Transform Infrared Spectrometer, Field Emission Scanning Electron Microscopy, Atomic Force Microscope and X-ray Diffraction were applied to explore the morphology, composition and structure of nanoparticles and membranes, and pervaporation tests were taken to investigate the behavior of hydrophobic polymer-based multilayer membranes. For the recovery of low concentration n-butanol, the prepared non-defective multilayer TAO/ZIF-8/K-PDMS composite membrane displayed excellently total permeate flux of 2890 g m −2 h −1 with competitive separation factor of 40.3.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiaoyan Leng,Wei Qin,Ning Guo,Xinliang Liu,Ming Wang,Yingfei Hou
Dimethyl carbonate (DMC) was widely used as an environmentally friendly organic compound. However, the production process of DMC generated a methanol (MeOH)/DMC azeotrope, which increased the separation cost. Pervaporation technology was considered a promising method for the separation of MeOH/DMC. Based on the polarity differences between MeOH and DMC, polyethyleneimine (PEI) with abundant polar groups ( NH 2 ) was selected as the membrane material for the separation of MeOH/DMC. We enhanced the organic solvent swelling resistance of PEI through in situ growth of SiO 2 and surface gradient crosslinking modifications. The results demonstrated that both the in-situ growth of SiO 2 and the surface gradient crosslinking modification significantly improved the membrane’s resistance to organic solvent swelling. However, the surface gradient crosslinking was the primary factor contributing to the enhancement. The membrane performance is optimized by adjusting the PEI concentration, TEOS concentration, TEOS reaction time, TMC concentration, and TMC crosslinking time. The prepared membrane achieved a flux of 0.9 kg·m −2 ·h −1 , with a separation factor of 54, and maintained stable operation for 50 h.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·Vol. 65
·期 34
·18449-18463
·
IF 3.9
Kasuri Amna,Khan Palwasha,Khan Asim Laeeq,Gilani Mazhar Amjad,AlMohamadi Hamad,Batool Mehwish,Usman Muhammad,Zaman Muhammad,Yasin Muhammad
Mixed matrix membranes (MMMs) are promising for overcoming
the
permeability–selectivity limitations of polymeric membranes,
yet their performance is often restricted by filler aggregation and
interfacial defects at high loadings. Here, we introduce ZIF-90 in
a porous liquid-like dispersion form as a filler for high-performance
MMMs. Carbene functionalization provides liquid-like interfacial compatibility
while preserving the microporosity of ZIF-90, enabling homogeneous
nanoscale dispersion within a polydimethylsiloxane (PDMS) matrix at
high loading. This architecture creates continuous selective transport
pathways and suppresses nonselective interfacial defects. Consequently,
the ZIF-90-PL/PDMS membrane exhibits enhanced permeability and selectivity,
achieving a total flux of 3.86 kg m –2 h –1 and a separation factor of 29.3 for ethanol recovery at 60 ° C
with 45 wt % loading, outperforming conventional MMMs. Mechanistic
analysis reveals that functionalization enhances ethanol-selective
sorption and reduces diffusion resistance, mitigating the permeability–selectivity
trade-off. These findings establish the porous liquid-like MOF dispersion
as an emerging class of membrane fillers for future separation membranes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Rehan Khan,Ihtisham Ul Haq,Heng Mao,Ao-Shuai Zhang,Li-Hao Xu,Hong-Gang Zhen,Zhi-Ping Zhao
Phenol is highly toxic and carcinogenic even at low concentrations. This study focused on preparing high-performance mixed matrix membranes (MMMs) for the pervaporation separation of phenol from its aqueous solution. A highly-efficient zeolitic metal azolate framework, RHO-[Zn(Heim) 2 ] (MAF-6, Heim = 2-ethylimidazole) was incorporated into the polyether block amide (PEBA-2533) supported on the polyvinylidene fluoride (PVDF) ultrafiltration membrane. The MAF-6 was chosen as the filler due to its inherent hydrophobic surfaces and aperture size (7.6 Å), which is larger than the molecular kinetic diameter of phenol (6.6 Å). Effects of the casting solution concentration, active layer thickness, MAF-6 loading, operating temperature, and phenol concentration were systematically investigated. With the increase of the MAF-6 loading ratio X from 0 to 7, the phenol flux of the membrane was gradually enhanced, but the water flux was reduced. For 1000 ppm phenol aqueous solution at 80 °C, MAF-6–7@MMM displayed the optimal separation factor of 25.9 with a phenol flux of 89.2 g∙m −2 ∙h −1 . The pervaporation separation index (PSI) of the MAF-6–7@MMM was 1317.7 kg∙µm∙m −2 ∙h −1 at 80 °C, which was much higher than the PEBA/PVDF membrane (787 kg∙µm∙m −2 ∙h −1 ). Impressively, an increasing feed temperature enhanced the phenol flux more prominently than water, owing to the hydrophobicity and porosity of MAF-6. Consequently, the resultant MAF-6-X@MMMs broke the trade-off limitation between phenol permeability and selectivity. The as-prepared membrane also exhibited exceptional long-term stability, suggesting its prospect of industrial application.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Zhong Wei,Qiang Liu,Chunlin Wu,Heyun Wang,Hao Wang
In this study, poly(vinyl alcohol) (PVA) hybrid membranes with zeolitic imidazolate framework-90 (ZIF-90) particles were fabricated by the viscosity-driven in situ self-assembly of ZIF-90 particles in a PVA matrix and were employed for ethanol dehydration via pervaporation (PV) technology. By this method, the size-controlled and well-distributed ZIF-90 particles were successfully embedded into PVA membranes. Based on the cross-linking reactions between the ZIF-90 particles and the PVA matrix, the ZIF-90/PVA hybrid membranes demonstrated higher mechanical strength, swelling resistance, and a high separation performance for ethanol dehydration. The ZIF-90/PVA hybrid membranes were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffractometry, thermogravimetric analysis, a mechanical test, and water contact angle measurements. The effects of the ZIF-90 particle size, loading level, thermal treatment temperature, operation temperature, and the feed compositions of the PVA hybrid membranes on the PV performance were systematically explored. Accordingly, the hybrid membranes exhibited excellent water permeability and selectivity for water–ethanol mixture separation. Specifically, the ZIF-90/PVA hybrid membrane (M-8), which was treated thermally at 130 °C, exhibited its optimal PV performance at a flux of 268 g/(m 2 h) and a separation factor of 1379 for the PV dehydration of the 90 wt% ethanol aqueous solution at 30 °C. The ZIF-90/PVA hybrid membranes exhibited excellent potential in the PV application for ethanol dehydration.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Wenzhong Ma,Taiyu Li,Chao Jiang,Peng Zhang,Li Deng,Rong Xu,Qi Zhang,Jing Zhong,Hideto Matsuyama
Pervaporation (PV) performance of polyimide (PI) membranes has been attempted for the recovery of high concentrations of aprotic solvents, such as N, N-dimethyl formamide (DMF) and N, N-dimethylacetamide (DMAc). In this work, we explored the effect of chain structure on the solvent resistance and pervaporation performance of hydrophilic pyromellitic dianhydride (PMDA) and 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) based polyimide membranes. According to the Hansen solubility parameters and membrane formation morphologies, we selected five aprotic solvent resistant PI membranes with different chain structures. It was found that the swelling degrees in DMF and DMAc was principally determined by the elasticity modulus of the PI membrane, and was significantly influenced by the polymer chain structure. The flexible linkages (such as –O CH 2 and CH 2 ) suppressed the PI chain packing, which resulted in the d -spacing and fractional free volume ( FFV ) of PMDA based PI membrane was higher than BTDA based PI membrane. BTDA-BZD membrane had the highest elasticity modulus together with the lowest d -spacing value (4.68 Å) due to its symmetric intermolecular interaction and rigid chain structure. PV experiments were conducted with DMF/water and DMAc/water mixtures over a wide range of temperatures (30–60 °C) with 90 wt% solvent concentration. The BTDA based PI (M4) composite membrane showed the highest separating factor around 275 at 30 °C in DMAc solution, which was much higher than in DMF solution (the separating factor is about 70). Furthermore, the chemical and thermal stability test for the PI composite membranes in the presence of the feed solvent under the PV process demonstrated the excellent separation stability in DMAc solution.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yu-Fei Lin,Yin-Xin Fang,Zhen-Liang Xu,Tian-Xiang Ren,Sun-Jie Xu,Dibakar Pandaya
SUZ-4 zeolite is a needle-like material with an oriented pore structure that has potential for separation. It is desired to prepare high-performance thin film composite (TFC) membranes via the interfacial polymerization (IP) process after incorporating SUZ-4 zeolite interlayers on macroporous ceramic hollow fibers to compensate for the surface defects. However, the incomplete coverage of the needle-like zeolite for the surface seriously affects the performance of the formed membranes. The spatial confinement property of graphene oxide (GO) was used to modify the SUZ-4 zeolite to the SUZ-4(G) zeolite with hierarchical stacked structures and larger size. SUZ-4(G) zeolite achieved sufficient coverage of the alumina substrate and obtained TFC membranes with good performance for isopropanol (IPA) dehydration under the one-pass IP process with ethylenediamine (EDA) and trimesoyl chloride (TMC). The TFC membrane after further optimization displayed a flux of 3.18 ± 0.1 kg/(m 2 ·h) with a separation factor of 3034 ± 98 (the water concentration in permeate was about 99.7 wt%) applied to pervaporation (PV) dehydration of 90 wt% IPA aqueous solution at 60 °C. Additionally, the novel TFC membrane developed has the potential for further applications due to its good stability.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhigang Xue,Yuan Shen,Liang Chen,Bo Liu,Na Hu,Rongfei Zhou,Weihong Xing
Pervaporation (PV) and vapor permeation (VP) using selective zeolite membranes are more energy-saving in dealing with azeotropic mixtures compared with conventional distillation for organic solvent dehydration. Herein, we developed a monolithic supported chabazite membrane and exploited its dehydration performance. The membrane was fabricated by secondary growth method on the 19-channel alumina monolithic without organic template. By finely controlling the homogeneity of nuclei growth and minimizing the intracrystalline defects through the epitaxial growth of uniformly nanosized SSZ-13 seed layer using cesium hydroxide and sodium hydroxide as cooperative hydration-mismatched inorganic structure directing agents (ISDA). The resulting monolithic chabazite membrane exhibits excellent water-perm-selectivity. The effects of feed water composition and operating temperature on the dehydration performance of the monolithic chabazite membrane were investigated through PV and VP processes. The typical membrane displayed excellent selectivities of more than 10,000 and 30,000 in 10/90 wt% water/ethanol and water/isopropanol mixtures at 393 K. The membrane exhibited excellent hydrothermal stability in a VP with a 10/90 wt% water/ethanol at 393 K for 72 h. The robust monolithic chabazite membrane with high packing density, strong mechanical strength, large membrane area and excellent water-selective performance significantly outperforms state-of-the-art membranes for dehydration in practical applications.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yuanhang Jin,Yu Xie,Haipeng Zhu,Jiangpu Nan,Fenjuan Xiangli,Gongping Liu,Wanqin Jin
Separation of azeotropic mixtures is a typical energy-intensive process in chemical industry, in which pervaporation membrane process shows great potential in energy efficiency. However, the performance of commercial membranes such as polydimethylsiloxane (PDMS) is unattractive for practical application. Henein, for the first time, we employed microporous MAF-6 as a new filler incorporating into PDMS membrane for pervaporation separation of DMC/methanol azeotropic mixture. The resulting MAF-6/PDMS mixed-matrix membrane with the optimal filler size of 300 nm and filler loading of 12 wt% exhibited highly DMC permeability (651–811.5 Barrer) and selectivity (10.1–10.4) during 31 days continuous separation process, which fairly exceeds the state-of-the-arts membrane performance. A pervaporation-distillation coupled process was further proposed for the purification of DMC/methanol mixtures, showing 55.7 % of energy-saving compared with conventional distillation process.
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高影响因子
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