Polymers
·
2022
·Vol. 14
·期 9
·1680
·
IF 4.967
Qiuping He,Wei Chen,Pengfei Wang,Xiaoming Dou
Separation of dichlorobenzene (DCB) isomers with high purity by time− and energy−saving methods from their mixtures is still a great challenge in the fine chemical industry. Herein, silicalite-1 zeolites/polydimethylsiloxane (PDMS) hybrid membranes (silicalite-1/PDMS) have been successfully fabricated on the porous polyvinylidene fluoride (PVDF) supports to first investigate the pervaporation separation properties of DCB isomers. The morphology and structure of the silicalite-1 zeolites and the silicalite-1/PDMS/PVDF hybrid membranes were characterized by XRD, FTIR, SEM and BET. The results showed that the active silicalite-1/PDMS layers were dense and continuous without any longitudinal cracks and other defects with the silicalite-1 zeolites content no more than 10%. When the silicalite-1 zeolites content exceeded 10%, the surfaces of the active silicalite-1/PDMS layers became rougher, and silicalite-1 zeolites aggregated to form pile pores. The pervaporation experiments both in single-isomer and binary−isomer systems for the separation of DCB isomers was further carried out at 60 °C. The results showed that the silicalite-1/PDMS/PVDF hybrid membranes with 10% silicalite-1 zeolites content had better DCB selective separation performance than the silicalite-1/α−Al2O3membranes prepared by template method. The permeate fluxes of the DCB isomers increased in the order of m−DCB < o−DCB < p−DCB both in single-isomer and binary-isomers solutions for the silicalite-1/PDMS/PVDF hybrid membranes. The separation factor of the silicalite-1/PDMS/PVDF hybrid membranes for p/o−DCB was 2.9 and for p/m−DCB was 4.6 in binary system. The permeate fluxes of the silicalite-1/PDMS/PVDF hybrid membranes for p−DCB in p/o−DCB and p/m−DCB binary−isomers solutions were 126.2 g∙m−2∙h−1and 104.3 g∙m−2∙h−1, respectively. The thickness−normalized pervaporation separation index in p/o−DCB binary−isomers solutions was 4.20 μm∙kg∙m−2∙h−1and in p/m−DCB binary−isomers solutions was 6.57 μm∙kg∙m−2∙h−1. The results demonstrated that the silicalite-1/PDMS/PVDF hybrid membranes had great potential for pervaporation separation of DCB from their mixtures.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Xue-San Wang,Quan-Fu An,Qiang Zhao,Kueir-Rarn Lee,Jin-Wen Qian,Cong-Jie Gao
Solution-processable polyelectrolyte complexes (PECs) incorporated with both sulfate (OSO3) groups and carboxylic acid groups (COOH) were prepared from sulfated sodium carboxymethyl cellulose (SCMC) and poly(diallydimethylammonium chloride) (PDDA). Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were utilized to characterize the chemical structures of SCMC and the compositions of SCMC/PDDA PECs. Membranes were made from PECs (SPECMs), and their surface properties were studied by field emission scanning electron microscopy and contact angle characterizations. Moreover, SPECMs were subjected to pervaporation dehydration of aqueous ethanol solution. Effects of SPECMs’ chemical compositions and operation conditions on pervaporation performance were studied and discussed in terms of membrane structures. It was found that OSO 3 groups were incorporated into SPECMs in the form of sulfate–amine ion-pairs, and they improved both the selectivity and flux in the dehydration of aqueous ethanol solution. For instance, the flux and water content in permeate for SPECM-0.34 in dehydration of 10 wt% water–ethanol mixture at 70 °C were 1760 g m −2 h −1 and 98.7 wt%, respectively, both of which were much higher than those for pristine PEC membranes with no sulfate groups. Moreover, the high separation performance of SPECMs was stable and both the tensile strength and elongation at break increased with increasing strong ion-pairs content. For instance, the SPECM-0.34 tensile strength and elongation at break were 64.5 MPa and 9.33%.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Heng Mao,Hong-Gang Zhen,Ali Ahmad,Ao-Shuai Zhang,Zhi-Ping Zhao
Biofuels separation using membranes becomes one of the research focuses in the field of renewable energy. In this study, a series of mixed matrix membranes (MMMs) with defect-free active layer around 1 µm thickness were elaborately prepared through interfacial synthesis for ethanol permselective pervaporation . Polydimethylsiloxane (PDMS) was employed as polymer matrix , which adjusted the nucleation of MOF precursors to in situ generate ZIF-8 nanoparticles . Within the active layer, the resultant ZIF-8 nanoparticles provided the preferential pathways for ethanol due to their ultrahigh adsorption capacity and super-hydrophobicity. Moderate aggregation could form the relatively continuous diffusion pathways. This approach rendered the uniform dispersion of ZIF-8 nanoparticles within PDMS matrix and their excellent compatibility. The ZIF-8 nanoparticles endowed the membranes with enhanced ethanol affinity, hydrophobic property, and thermal stability. More importantly, the ZIF-8 nanoparticles substantially reduced the permeation energy barriers of the membrane for penetrants. The membranes displayed the simultaneous increase in permeation flux and separation factor when utilized for ethanol recovery from aqueous solution, revealing the desirable anti-tradeoff effect. Particularly, the resultant membrane exhibited a superior pervaporation performance with relatively high permeation flux (1778 g · m -2 · h -1 ) and comparable separation factor (12.1) in separating 5.0 wt% ethanol aqueous solution at 40 °C.
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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.
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JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Honghao Su,Fusheng Pan,Siwei Wang,Han Zhang,Yuhang Guo,Hao Qi,Jing Huang,Zhijie Yuan,Zhanquan Zhang,Zhongyi Jiang
The energy-efficient separation of chemically similar aromatic/alkane mixtures is pivotal for modern molecular refining, yet polymeric membranes are perennially constrained by the permeability-selectivity trade-off. To circumvent this bottleneck, we report an interfacial engineering strategy utilizing size-tunable MOF (Cu-TCPP, TCPP: tetrakis (4-carboxyphenyl)porphyrin) nanosheets to engineer selective interfacial transport channels in hybrid membranes. By modulating the reaction time, the size-to-thickness ratio of the nanosheets was precisely regulated. Crucially, the sub-nanopores (0.38 nm) of Cu-TCPP preclude transport through intrinsic pore channels, thereby indicating that molecular transport preferentially occurs through MOF-polymer interfacial regions. This architecture establishes a synergistic mechanism of geometric exclusion and facilitated transport. Our results reveal that the extended diffusion pathways, dictated by the lateral sizes of the 2D nanosheets, significantly enhance geometric exclusion for n -heptane. Meanwhile, the abundant MOF active sites provide low-resistance transport channels for toluene through preferential interaction. Consequently, at an ultralow loading of 0.1 wt%, the optimized membrane achieved an exceptional flux (1170 g m −2 h −1 ) and a separation factor (6.17) for a toluene/ n -heptane mixture, with robust stability over 160 h. This work provides an effective approach for exploiting 2D nanomaterials to engineer interfacial transport channels for challenging molecular separations.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Mengshi Chen,Jingkai Bian,Xinzhao Luo,Tianheng Wang,Haisheng Zhang,Qiang Zhang,Wei Yang,Jinyou Shen,Yufei Deng,Yingquan Zou
The primary challenge for pervaporation in organic solvent separation lies in the inherent trade-off between permeability and selectivity, along with swelling issues of traditional polymer membranes. While nanofillers offer a promising solution, achieving their interfacial compatibility and uniform dispersion within the polymer matrix remains the key to success. In this study, we fabricated a PTFE/Py(P-G) pervaporation membrane via cationic photopolymerization of epoxy-functionalized polyhedral oligomeric silsesquioxane (POSS) and glycidol for the separation of ethanol/n-hexane azeotrope. By chemically crosslinking POSS into the polymer network, we effectively addressed the issues of loading limitation and poor compatibility commonly encountered in nanofiller-based membranes. The constructed POSS-reinforced polyether network exhibited exceptional organic solvent resistance. Within this hybrid structure, POSS units provide selective transport pathways, while the polyether segments contribute to increased free volume and enhanced ethanol affinity. The optimized PTFE/Py(P-G)-0.45 membrane achieved a high separation factor of 225.07 for ethanol/n-hexane azeotrope, along with remarkable long-term operational stability in continuous testing. This work demonstrates the effectiveness of molecularly designed hybrid networks in advancing pervaporation membrane performance for challenging organic separations.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Dongyi Yang,Cheng Chen,Jiqing Xie,Yuanqing Ye,Zhi Zhou,Huiyun Liao,Zhong Yao
The application of pervaporation technology in the recovery of aromatic compounds from water faces the challenge of low performance. In this paper, a uniform zeolitic imidazolate framework/polydimethyl-siloxane (ZIF-8/PDMS) composite membrane was fabricated by means of contra-diffusion crystallization and a casting method in sequence. The diffusion time was optimized to be 24 h. ZIF-8/PDMS showed improving performance to pure PDMS . The permeation flux of linalool, neral, and geranial in ZIF-8/PDMS increased by 73.3%, 110.9%, and 106.0%, respectively; and the separation factors were also improved. The separation effect of neral (cis-citral) was much better than that of geranial (trans-citral), suggesting the potential enantioselectivity. In ternary model system, the separation of citral (neral and geranial) was competitively restrained by the presence of linalool. ZIF-8/PDMS also showed good performance in real lemon oil. After treatment for 9 h, the recovery rates of linalool, neral and geranial were 97.20%, 96.15%, and 92.56%, respectively.
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高影响因子
ACS Omega
·
2022
·
IF 4.132
Xu Zhang,Zhaowei Tong,Chao Liu,Lei Ye,Yuwei Zhou,Qin Meng,Guoliang Zhang,Congjie Gao
Metal–organic framework (MOF)-based polydimethylsiloxane mixed matrix membranes applied for alcohol recovery with high permeability and selectivity are drawing more and more attention. However, the design and fabrication of high-quality and stable MOF-based mixed matrix membrane for pervaporation are still a big challenge. Herein, PDMS functionalized MOF-derived nanoporous carbon (P-ZNC) was first explored as compatible nanofiller to mutually blend with polydimethylsiloxane on PVDF substrate to fabricate defect-free mixed matrix membranes via dip-coating and thermal cross-linkng. Induced by UV illumination, hydrophobic modification of MOF-derived nanoporous carbon was successfully realized under mild conditions within one step, simplifying the operation step. By using this facile strategy, we can not only solve the existing problem of agglomeration, but also covalently cross-link MOF derivative with polymeric matrix and effectively eliminate the interface defect between polymer and nanoparticles without any extra steps. The method also gives a good level of generality for the synthesis of versatile stable nanoporous MOF-derived carbon-based mixed matrix membranes on various supports. The prepared PDMS/P-ZNC with commendable structures possessed excellent separation performance in low concentration n-butanol recovery and had a good balance between permeance, selectivity, and stability.
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DOI
PubMed
高影响因子
DESALINATION
·
2019
·
IF 6.035
Indah Prihatiningtyas,Gebrehiwet Abrham Gebreslase,Bart Van der Bruggen
In this study, nanocomposite membranes were prepared by incorporating alumina (Al 2 O 3 ) nanoparticles into cellulose triacetate (CTA) membranes in order to enhance the performance of pervaporative desalination . The resulting membranes were characterized by SEM, TGA , water contact angle, water uptake , tensile strength , and FTIR. The desalination performance was investigated as a function of Al 2 O 3 loading, feed temperature (ranging from 40 to 70 °C) and feed concentration (varying from 0 g/L to 90 g/L NaCl). Pervaporation (PV) experiments showed that incorporating 2% Al 2 O 3 into a CTA membrane increased the water flux by 204% compared to pristine CTA (from 2.2 kg m −2 h −1 to 6.7 kg m −2 h −1 ) for a 30 g/L NaCl feed solution at 70 °C, while the salt rejection remained above 99.8%. Moreover, when the CTA-2% Al 2 O 3 nanocomposite membrane was tested with a 90 g/L feed solution, only 25% flux reduction without sacrificing the salt rejection. Furthermore, different feed concentration affected the activation energy of water molecules to diffuse through pristine CTA and CTA/Al 2 O 3 nanocomposite membrane. However, the nanocomposite membrane has a lower apparent activation energy even at high NaCl concentrations, compared to the pristine CTA. This suggests that the developed CTA/Al 2 O 3 nanocomposite membrane is suitable for desalting hypersaline water.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chan Pei,Heng Mao,Yu-Jie Wang,Wei-Min Liu,Zheng-Zheng Li,Wen-Wen Xie,Yan Li,Zhi-Ping Zhao
Mixed matrix membranes (MMMs) have been shown great performance and remarkable stability for diverse molecular separations. Considering that the density of MOFs is usually higher than that of polymer doping solution, the upper separation layer surface of MMMs is enriched by the polymer matrix, compromising the membrane performance. In this study, the asymmetric separation layer of MOF-filled MMMs was etched by the long-distance and dynamic low-temperature (LDDLT) plasma for enhanced ethanol permselective pervaporation. The thickness of separation layer decreased and the MOF amount on surface increased after the LDDLT plasma etching, which dramatically reduced the molecular permeation resistance and improved the membrane performance. Under optimal plasma conditions, the etched MMMs exhibited the superior permeation flux of 1120 g·m −2 ·h −1 (60% more than that of unetched membrane) and the separation factor of 12.3 (1.16 times as much as that of unetched membrane) in separation of 5 wt% ethanol aqueous solution at 40 °C.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 23
·e53928
·
IF 3
Jiawen Fu,Haowei Pan,Mingzhe An,Zihao Li,Hong Wang,Xinping He,Chunhai Yi
Polyvinyl alcohol (PVA) is a promising membrane material for pervaporation (PV) desalination. However, the adjustment and control of the cross-linking structure is still a challenge for PVA membrane. In this study, a novel pH-resistant PVA-based composite membrane for efficient pervaporation desalination was developed by precisely adjusting the cross-linking behavior. Vinyl alcohol-vinylamine copolymer (VA-co-VAm) containing both hydroxyl and amino groups was synthesized. Cross-linking reaction was carried out based on the Schiff base reaction between amino groups (in VAm moiety) and glutaraldehyde (GA) under alkaline conditions. Cross-linking degree of PVA selective layer was carefully controlled by adjusting the amino group content in copolymer. Results showed that membrane prepared with VA-co-VAm that containing 5 wt% N-vinylformamide (NVF) displayed superior hydrophilicity and the largest free volume fraction. Pervaporation test indicated that the modified cross-linking membrane showed good stability under extreme pH conditions. Specifically, under strong acid conditions (pH ~ 1) and alkaline conditions (pH ~ 14), the membrane showed excellent desalination performance with water flux over 12 kg/(m 2 h), and the salt rejection higher than 99.95%. Based on the above results, the prepared membrane offers a promising platform for desalination under extreme pH conditions, which shows great potential in industrial wastewater treatment.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Heng Mao,Hong-Gang Zhen,Ali Ahmad,Shen-Hui Li,Yue Liang,Jun-Fan Ding,Yao Wu,Lin-Zhi Li,Zhi-Ping Zhao
High separation performance and superior mechanical properties of the membranes are both of critical importance for membrane modules to achieve high efficiency and long-term stability. Herein, a series of mixed matrix membranes (MMMs) with brick-and-mortar architecture are prepared by incorporating two-dimensional zeolitic imidazolate framework-L (ZIF-L) nanosheets into polydimethylsiloxane (PDMS) matrix for separating alcohols (ethanol, n -propanol or n -butanol) from aqueous solution. The unique leaf-like morphology, flexible pore structure , and high hydrophobicity of ZIF-L nanosheets allow the straight and preferential permeation for alcohols; while the brick-and-mortar architecture renders the tortuous and intricate pathways for water, thus improving the membrane selectivity. Incorporating ZIF-L nanosheets endows the membranes with outstanding pervaporation performance, together with unusual and favorable increase in mechanical properties. More interestingly, the subtle interconnection of ZIF-L nanosheets creates the relatively continuous pathways for penetrants. Consequently, the resultant membrane displays a high separation factor (57.6) and a comparable permeation flux (402 g m −2 h −1 ) in separating 1.0 wt% n -butanol aqueous solution at 40 °C. Furthermore, the presence of ZIF-L nanosheets donates good thermal properties and promising long-term stability to the membranes. The findings of engineering brick-and-mortar architecture through two-dimensional porous fillers may provide new insights into designing high-performance MOF-based membranes for various applications.
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高影响因子
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