INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Yumeng Zhao,Guoshu Gao,Peng Zhu,Haiou Liu,Yu Guo,Xiongfu Zhang
Purification and dehydration of ethyl acetate are important processes in chemical production, and the preparation of stable and efficient pervaporation membrane materials has still been a challenge. In this work, a well-intergrown polycrystalline Al-Fum@CS tubular membrane was successfully prepared by a synergistic strategy involving seeded growth combined with surface remediation and applied for the first time in the separation of a multicomponent mixture containing ethyl acetate by pervaporation. By regulating the synthesis conditions, a continuous Al-Fum membrane with thickness of 1.7 μm was initially grown within the innermost part of a uniform seed layer. Subsequently, a chitosan (CS) layer was introduced onto the membrane to fabricate the Al-Fum@CS membrane. This CS layer significantly modifies the defects existing in the membrane surface. The obtained Al-Fum@CS membrane with the thickness of around 1.8 μm is dense and has strong hydrophilicity. It can preferentially separate water from a ternary azeotropic mixture of water–ethanol–ethyl acetate and displays high pervaporation performance with a permeation flux of 1.88 kg/(m2·h) and a separation factor of ∼6000 at 60 °C. Especially, the Al-Fum@CS membrane can be continuously operated for more than 150 h without any obvious change in separation performance, showing excellent ultrahigh stability. Moreover, the as-prepared membrane has good acid resistance and reusability in complex environments according to the results of multiple mixture pervaporation experiments. Therefore, the Al-Fum@CS tubular membrane has great industrial application potential for the purification of ethyl acetate produced from the esterification reaction.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuanliang Gu,Zinan Zhang,Shengshen Gu,Qi Zhang,Meng Guo,Yang Pan,Genghao Gong,Zhaoliang Cui,Xiuxiu Ren,Jing Zhong
1,2-bis(triethoxysilyl)ethane (BTESE)-derived organosilica membranes have good acid-resistant stability in the application of acetic acid dehydration via pervaporation technology. To enhance the separation performance of water (0.26 nm) and acetic acid (0.43 nm), graphitic carbon nitride (g-C 3 N 4 ) distinguished by its periodic nanoporosity (0.31-0.34 nm) and hydrophilic functionality, offers exceptional potential for organosilica-based membranes improvement. Herein, we tailored g-C 3 N 4 nanostructures as 2D nanosheets (4 nm thickness) and 0D quantum dots (4 nm diameter), and embedded them into BTESE membranes. For their thermal stability, the nanosheets enhanced structural integrity due to interlayer covalent/hydrogen bonding networks, while quantum dots exhibited a larger weight loss but preserved more residues at 800 o C. Nanosheets incorporated BTESE/g-C 3 N 4 composites reduced BTESE pore size, amplified surface hydrophilicity and membrane thickness, whereas quantum dots with abundant functional groups minimally altered BTESE matrix structures. In pervaporation of acetic acid/water, BTESE performance was improved by both morphologies of g-C 3 N 4 fillers at the same optimal loading. The nanosheet-incorporated membrane (BTESE/CN-NSs-3) achieved a separation factor of 2327 with a flux of 2.35 kg/m 2 ·h, while quantum dots-incorporated membrane (BTESE/CN-QDs-3) exhibited a higher flux of 2.52 kg/m 2 ·h but a lower separation factor of 1352. In feed concentration (50–90 wt% AcOH) and temperature dependent (55–95 °C) operations, nanosheets facilitated molecule sieving through interlayer channels, whereas quantum dots enabled lower-resistance pathways by diffusivity dominated permeation. This work establishes g-C 3 N 4 dimensionality modulating organosilica membrane’s transport hierarchy, providing a selection for developing acid-resistant membranes in improving flux and separation factor.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Deyu Si,Meihua Zhu,Xinmei Sun,Miao Xue,Yuqin Li,Ting Wu,Tian Gui,Izumi Kumakiri,Xiangshu Chen,Hidetoshi Kita
The formation progress of the high aluminum ZSM-5 zeolite membrane was investigated and characterized with the organic template-free and fluoride-containing initial synthesis gel. The nano spherical Silicalite-1 seed crystals were dissolved into amorphous by the fluoride-containing precursor synthesis gel. The amorphous contained elementary structural units (TO 4 ) and isolated five-membered ring structure of MFI zeolites. These were retained to provide the nucleation sites for high aluminum ZSM-5 zeolite. The ZSM-5 zeolite nucleus was grown into fine needle-like ZSM-5 zeolites, which were gradually grown into twin crystals, aggregation and compact ZSM-5 zeolites layer on the support without the organic template initial synthesis gel. In addition, the high aluminum ZSM-5 zeolite membranes kept the identical morphology and structure for separation of high concentration acetic acid (H 2 O/HAc) or inorganic acid (1 M H 2 SO 4 ) aqueous mixtures by XRD, SEM and NMR characterization. Furthermore, the membrane had a good dehydration performance and acid-stability by pervaporation. The flux and separation factor of the membrane for 10 wt% H 2 O/HAc mixtures were 0.98 kg∙m −2 ∙h −1 and 3200 at 348 K, respectively.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Pengbo Zhao,Bowen Yao,Junquan Meng,Rui Zhang,Bing Cao,Pei Li
Pervaporation (PV), as a cost-efficient concentrating process, has been studied for Zero Liquid Discharge (ZLD) of desalination. Although high water flux and excellent salt rejection have been reported for many PV membranes. The desalination performance, fouling behavior, and cleaning protocol for treating real reverse osmosis concentrate (ROC) generated from industrial plants have never been studied. Meanwhile, understanding the fouling behavior and cleaning method in the treating process is crucial for the development of suitable PV desalination membranes. In this study, we used a lab-made PV membrane to treat industrial ROC with a high chemical oxygen demand (COD) value and high salt concentrations. The results showed that conductivity and COD of the produced water were below 20 μs/cm and 70 mg/L, respectively, which fulfilled the discharge standard. However, the membrane fouling problem was not trivial. To address the fouling issue, a chemical softening method was adopted to remove the calcium salts of the ROC, and a membrane cleaning method was developed to regenerate the water flux. As a result, a long-term water flux of 31.27 kg/m 2 ·h with a flux recovery rate of 98% were realized. This highlights the potential of PV desalination technology for ROC reclamation.
✓ 已验证
DOI
高影响因子
Advanced Membranes
·
2021
·
IF 0
Ao-Shuai Zhang,Shen-Hui Li,Heng Mao,Li-Hao Xu,Ming-Yu Lv,Zhi-Ping Zhao
Organophilic pervaporation (PV) mixed matrix membranes (MMMs) possess huge potential in organic wastewater treatment with merits of environmentally friendly and high-efficiency. The filler dispersion structure inside MMMs is required to explore in depth to upgrade the PV performance. In this study, an ethoxysilyl functionalized ionic liquid (IL-PTES) modified ZIF-8 nanoparticles (IL-PTES@ZIF-8) were synthesized by one-pot method, and then incorporated into the PDMS matrix to prepare MMMs for PV separation of ethyl acetate (EtOAc) from its diluted aqueous solution. The preferential adsorption performances to EtOAc by IL-PTES, especially for the functions of specific chemical groups in IL-PTES, were researched via molecular dynamicssimulation approach. Furthermore, the IL-PTES covered on ZIF-8 surface could crosslink with PDMS chains, thereby enhancing the interfacial compatibility between ZIF-8 and PDMS. Importantly, the self-aggregated IL-PTES subtly “glued” the nanoparticles together to lead IL-PTES@ZIF-8 a relatively continuous and defect-free distribution state. This condition would lead to a high-efficiency molecular pathway with less polymer phase and much relatively continuous ZIF-8 phase with high selectivity. PV results suggested that the MMMs with 15% IL-PTES@ZIF-8 loading displayed an optimal separation performance with an ultra-high separation factor of 492 (158.7% more than that of pristine PDMS membrane) and normalized EtOAc flux of 4.98 kg μm m −2 ·h −1 (2 times as much as that of pristine PDMS membrane) for separating 1 wt% EtOAc aqueous solution at 30 °C. These findings offered significant advancement toward developing high-performance MMMs enabled by the synergy of MOFs and ionic liquid.
✓ 已验证
DOI
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·Vol. 110
·期 2
·333-345
·
IF 2.3
Peng Jia,Wu Hongdan,Zhou Zhihui,Li Rongxue
Boron-doped silica membrane (B-SiO 2 membrane) was prepared using the sol-gel method, with 1, 2-bis(triethoxysiliconyl) ethane (BTESE) and boric acid as raw materials and ethanol as the solvent. The effects of the B/BTESE molar composition and feed liquid temperature on the structure and dewatering properties of the B-SiO 2 membranes were investigated. The results show that boron is successfully doped into the SiO 2 skeleton, Si-C-C-Si bond condensation forms lots of hydrothermal stable Si-O-B bonds and Si-O-Si bonds, resulting in an increase in surface hydrophilicity, a decrease in pore size and an improvement in pervaporation and dehydration performance. The B-SiO 2 membrane was subjected to HCl post-treatment to evaluate its long-term stability. Following boron acid modification and HCl post-treatment, all the SiO 2 membranes exhibited microporous characteristics with a decrease in the specific surface area and pore size. Although membranes’ thickness showed minimal variation, the pervaporation dehydration performance was substantially enhanced. After a 216 h long-term stability test, the membranes exhibited excellent performance, with a stable flux of 2.61 kg·m −2 ·h −1 and a separation factor above 552. Graphical
研究领域:
膜科学
·
化学工程
·
材料科学
·
分离技术
✓ 已验证
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2026
·
IF 8.8
Xiaoqin Wang,Yuanhui Zheng,Shuang Han,Guofang Dang,Xuefei Sun,Jinchen Li,Mengyao Liu,Baoguo Sun,Nan Meng
Pervaporation technology is a novel and sustainable separation method capable of replacing distillation in spirit production. The feasibility of laboratory-scale pervaporation technology for this purpose has been established. Therefore, the impact of scale-up to pilot-scale on the aroma characteristics of ‘Cabernet Sauvignon’ grape spirits was assessed using a Sensomics approach in this research. Aroma extract dilution analysis combined with gas chromatography-olfactometry-mass spectrometry identified highly similar aroma components in both laboratory-scale (L-Z) and pilot-scale (P-Z) spirits, with 47 and 40 compounds identified, respectively. The levels of key aroma compounds and their flavor dilution factors were highly consistent between the two samples. Of the 49 quantified aroma compounds, isoamyl alcohol and ethyl octanoate were the most abundant, while ethyl octanoate, β -damascenone, and acetoin exhibited the highest odor activity values (OAVs). Importantly, most compounds showed no significant differences in concentration or OAVs between P-Z and L-Z. Quantitative descriptive analysis revealed a high aroma profile similarity of 94% between the two samples, with no significant difference in the intensity of aroma attributes. The preference test confirmed that there was no significant difference in consumer preference between the two. These results demonstrate the feasibility and stability of equipment performance during scale-up, supporting the further application of pervaporation technology in industrial spirit production.
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Haoji Jiang,Wenxiong Shi,Qiang Liu,Heyun Wang,Jialu Li,Chunlin Wu,Yingchun Li,Zhong Wei
In order to investigate the effects of MOFs by altering ligands with various functional groups on separation selection in pervaporation dehydration, three hydrophilic UiO-66-X nanoparticles were respectively synthesized and blended into poly (vinyl alcohol) matrix to fabricate water-selective membrane for ethanol dehydration via PV technology. Both the experimental and molecular simulation results confirmed the UiO-66-X counterbalancing factors of enhanced polarity and suitable pore size gave rise to the optimal performance in ethanol dehydration. The PV performances could be tuned by the type and quantity of functional groups carried by UiO-66-X nanoparticles. As a result, the pore aperture of UiO-66-(COOH) 2 nanoparticles provided continuous channel for water diffusion, and water molecules could also be activated attributed to the strong interaction between the UiO-66-(COOH) 2 nanoparticles and water molecules which enhanced the penetration and diffusion of water molecular in hybrid membrane to increase the water flux. The optimized hybrid membranes with UiO-66-(COOH) 2 loading of 8 wt% exhibited the total flux of 979 ± 7 g/(m 2 ·h) and a separation factor of 2084 ± 21.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yumeng Zhao,Guoshu Gao,Peng Zhu,Haiou Liu,Yu Guo,Xiongfu Zhang
The preparation of stable metal–organic framework tubular membranes for liquid mixture separation has always been a tough problem. Herein, a flexibly prepared, continuous, and stable Al-based CAU-10 membrane with ceramic tubes as support was developed by a thin γ-Al2O3 layer induction method and employed for the first time in the separation of MeOH/MTBE azeotropic mixtures through pervaporation. The γ-Al2O3 layer introduced on the tube by the dip-coating technique not only facilitated the crystal nucleation and continuous growth of CAU-10 membranes but also reinforced the membrane stability by acting as anchoring sites between the membrane and the substrate. The as-prepared CAU-10 tubular membrane exhibited excellent separation performance for MeOH/MTBE mixtures owing to its suitable pore size and good hydrophilicity. For the separation of 14.3 wt % MeOH/MTBE azeotropic mixtures, the membrane displayed a permeation flux of 1.76 kg/(m2 h) and a high separation factor of 2041 at 50 °C, which is better than most of the membranes reported for the pervaporation separation of MeOH/MTBE mixtures. More excitedly, the CAU-10 tubular membrane continued to be tested for more than 7 days without any obvious change in pervaporation performance, demonstrating its outstanding operational and hydrothermal stability. Accordingly, the CAU-10 tubular membrane would be a promising alternative to separate the MeOH/MTBE azeotropic mixtures due to its easy preparation, high performance, and excellent stability.
✓ 已验证
产品关联
DOI
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.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Shiyu Zhang,Yun Zou,Tengyou Wei,Chunxia Mu,Xiangjun Liu,Zhangfa Tong
The blended membranes of polyvinyl alcohol (PVA) and chitosan (CS) (PVA-CS) were prepared for pervaporation dehydration of a binary system of n -butyl acetate/water and a ternary mixture of n -butyl acetate/ n -butanol/water. Membranes were characterized by FTIR, DSC and XRD to investigate the intermolecular interactions, the blending compatibility and the effects of blending on crystallinity. Tensile strengths were measured to determine the influence of blending ratios on the membrane’s mechanical properties. The membrane’s degree of swelling in water dropped significantly with increasing CS fraction. The results agreed well with the calculation of the solubility parameter. Separation factor and permeation flux increased when the temperature was raised for both the binary and ternary pervaporation systems. An optimal separation factor of 27,000 with a total flux of 402 g·m −2 ·h −1 was obtained using the blend membrane containing 25 wt% CS at 40 °C for the binary system. For the ternary system, the maximum separation factor and total flux were obtained for blend membranes at 75 wt% and 50 wt% CS content, respectively.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）