Membranes
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2022
·Vol. 12
·期 8
·786
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IF 4.562
Xingqian Wang,Yuping Zhang,Xinwei Chen,Yifei Wang,Mingliang He,Yongjiang Shan,Yuqin Li,Fei Zhang,Xiangshu Chen,Hidetoshi Kita
Fillers play a critical role in the performance of mixed matrix membranes (MMMs). Microporous metal azolate frameworks (MAFs) are a subclass material of metal–organic frameworks (MOFs). Due to the uncoordinated nitrogen of the organic ligands, MAF-7 (SOD-[Zn(mtz)2], Hmtz = 3-methyl-1,2,4-triazole, window: d = 0.34 nm) shows excellent CO2adsorption performance. In this work, Pebax 1657/MAF-7 MMMs were prepared by a sample solution casting method with MAF-7 particles as fillers for the first time. By means of X-ray diffraction (XRD), scanning electron microscope (SEM), infrared radiation (IR), and thermogravimetry (TG), the compositional and structural properties of the mixed matrix membrane with different filler content were analyzed. The results show that the compatibility of MAF-7 and Pebax is good with a filler content of 5 wt.%. The pure gas testing showed that mixed matrix membrane has a high ideal CO2/N2selectivity of 124.84 together with a better CO2permeability of 76.15 Barrer with the optimized filler content of 5 wt.%. The obtained membrane showed 323.04% enhancement in selectivity of CO2/N2and 27.74% increase in the permeability of CO2compared to the pristine membrane at 25 °C and 3 bar. The excellent separation performance may be due to the ligands that can afford a Lewis base active site for CO2binding with the uniform dispersion of MAF-7 particles in Pebax and the favorable interface compatibility. The obtained membrane overcomes the Robeson’s upper bound in 2008 for CO2/N2separation. This work provides a new strategy by utilizing MAFs as fillers with triazole ligand to enhance the gas separation performance of mixed matrix membranes.
研究领域:
材料科学
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气体分离
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膜技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Siraj Ahmad,Shaohan Lian,Yaxin Tan,Run Li,Quan Zhao,Chunfeng Song,Qingling Liu,Shijian Lu
Mixed matrix membranes (MMMs) have gained significant attention in CO 2 separation. However, the symmetrical dispersion of inorganic filler nanoparticles during MMMs fabrication is still a crucial challenge. The present work investigates the outcome of N-Methyl-2-pyrrolidone (NMP) and N-N-Dimethyl-formamide (DMF) solvents on MMMs texture, perm-selectivity and nanoparticles dispersion. Scanning electron microscopy (SEM), Fourier-transform-infrared (FTIR) and X-Ray Diffraction (XRD) analyses were also performed for membrane characterization. The MMMs fabricated with NMP solvent showed competitive CO 2 permeability (120.20 barrer) and CO 2 /N 2 selectivity (69.31) compared to the membranes prepared with DMF solvent. It has been indicated that the molar volume, boiling point and solubility parameters were significant factors in the solvent selection. Moreover, the effect of operating temperature on gas transport properties showed substantial impact in perm-selectivity, at 3 bar feed-pressure, with the temperature dropping from 40 °C to 0 °C, the CO 2 /N 2 gases selectivity increased from 69.31 to 105.50, equating to a 64.8% decrease in CO 2 permeability.
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
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yinzi Shao,Xueyang Zhang,Wenyi Tan,Yan Zhao,Feiyue Li,Bin Gao
Biochar derived from wheat straw was prepared and subsequently modified with hydrogen peroxide through ball milling, yielding ball-milled wheat straw biochar (BMWB). BMWB/Pebax mixed matrix membranes (MMMs) were prepared by incorporating BMWB into Pebax-1657, and their CO 2 separation performance was evaluated. The results showed that ball milling successfully reduced the biochar particle size, increased its specific surface area, and strengthened the intensity of surface functional groups. Furthermore, hydrogen peroxide modification augmented the oxygen-containing functional groups on the biochar surface, enhancing its hydrophilicity and improving its dispersion within the Pebax-1657. Under the experimental conditions of 25°C and 0.2 MPa, the MMMs loaded with 3 wt% BMWB exhibited significantly enhanced gas separation performance, with a CO 2 permeability of 97.75 Barrer and CO 2 /N 2 selectivity of 62.3. These values represent substantial improvements of 38.8% and 32.8%, respectively, compared to the pristine Pebax-1657 membrane. This enhanced separation performance can be ascribed to two primary factors: (1) the presents of abundant functional groups (e.g., carboxyl and amino groups) on BMWB significantly improved CO 2 affinity; and (2) the intrinsic gas transport channels within BMWB, combined with the tortuous pathways generated by the effective stacking of BMWB particles, synergistically enhanced both CO 2 permeability and selectivity.
研究领域:
材料科学
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化学工程
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环境科学
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膜技术
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气体分离
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xiaoting Feng,Chenlu Liu,Kunkun Ren,Xinglei Zhao,Longjie Liu,Keming Zhang,Xiaohe Tian,Qingnan Wang,Xiangyu Liu,Yueyangchao Yu,Tianhe Gu,Shaofei Wang
The urgent need for efficient CO 2 capture technologies to mitigate climate change has driven the advancement of membrane-based separation systems. We report a mixed matrix membrane design through the in-situ growth of a ZIF-8 gel network within a Pebax-1657 matrix. By tuning the solvent ratio and concentration of modulator, ZIF-8 gel rather than particles are formed within the polymer, establishing a three-dimensional interconnected MOF network that ensures homogeneous filler dispersion and creates continuous gas transport nanochannels. The optimized membrane achieves a remarkable CO 2 permeability of 183.9 Barrer and a CO 2 /N 2 selectivity of 73.3, surpassing the 2008 Robeson upper bound. These values represent 190.4 % and 34.9 % enhancements in permeability and selectivity, compared to the pristine polymer. The membrane also demonstrates robust operational stability and maintains > 95 % of its initial performance over 60 days. This work offers a promising solution to creating continuous channels in CO 2 separation membranes.
研究领域:
材料科学
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化学工程
·
环境技术
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膜分离
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碳捕集
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dechao Wang,Yangyang Xin,Xiaoqian Li,Feng Wang,Yudeng Wang,Weirui Zhang,Yaping Zheng,Dongdong Yao,Zhiyuan Yang,Xingfeng Lei
Porous liquids (PLs), an emerging class of liquid materials with permanent porosity and good fluidity, have shown great potential in gas capture and separation. However, directly turning metal–organic frameworks (MOFs) into type 1 PLs via post-synthetic modification (PSM) strategy with corona-canopy species has not been reported till now. Moreover, challenges including reducing the cost and simplifying the synthesis process are daunting. In present study, we propose a universal approach to turn UiO-66 into PLs via post-synthetic modification strategy with core-corona-canopy structure using organosilane (OS) corona and oligomer canopy species. The ionically-tethered canopy species endow UiO-66 with good liquid-like behaviors at room temperature. CO 2 and N 2 adsorption–desorption behaviors revealed that PLs possessed great potential in CO 2 selective adsorption separation. Meanwhile, the enhanced CO 2 selective capture sites were determined. As a proof-of-concept, the as-prepared UiO-66-liquid-M2070 PL was incorporated into Pebax-1657 polymer matrix to prepare mixed matrix membranes (MMMs). The excellent dispersion ability, porous structures, and corona-canopy species contributed to the enhanced CO 2 selective permeation. Therefore, the CO 2 permeability and CO 2 /N 2 selectivity of MMM P-UiO-66-liquid-50 increased by 396.5% and 81.3%, respectively, compared with that of pure Pebax membrane, showing attracting prospect in membrane separation. Moreover, the generality of this PSM strategy was confirmed using other different types of canopy species. Remarkably, this PSM strategy could be applied to synthesize other types of advanced porous materials (APMs)-based (e.g., covalent organic frameworks (COFs)) PLs by utilizing the rich library of oligomer species, thus undoubtedly advancing the applications of porous liquids in gas storage and separation.
研究领域:
材料科学
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化学工程
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环境科学
✓ 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）