JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Heyang Liu,Shichen Zeng,Zhenyang Li,Da Zhang,Xu Liang,Hanze Ma,Jianyu Wang,Qianfeng Pan,Jinyue Wang,Jingqi Fu,Guangwei He,Zhongyi Jiang
Covalent organic framework (COF) materials exhibit considerable potential for membrane separation applications due to their long-range ordered pore structures, tunable pore chemical microenvironments, and excellent thermochemical stability. However, the intrinsic pore sizes of COF materials often exceed the kinetic diameters of target gas molecules, thereby limiting their efficacy in gas separation. In this study, we present a strategy for the functionalization of ionic COF nanosheets using ionic liquids. The immobilization of ionic liquids within the pores and interlayers of ionic COF nanosheets was accomplished through a straightforward physical blending method, which leverages the electrostatic interactions between the abundant charged groups from the ionic COF nanosheets and the ionic liquids. Subsequently, we prepared CO 2 separation membranes with a thickness of less than 100 nm. The resulting COF membranes demonstrated excellent separation performance with a CO 2 permeance of up to 1116 GPU and a CO 2 /N 2 selectivity of 20.3 as well as good stability. This study offers a simple and effective approach for developing high-performance COF membranes for carbon capture.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Shichen Zeng,Xu Liang,Mingang Zhao,Yanxiong Ren,Hanze Ma,Ziting Zhu,Yuhan Wang,Shaoyu Wang,Junyi Zhao,Guangzhaoyao Yang,Xuerui Wang,Fusheng Pan,Guangwei He,Zhongyi Jiang
Covalent organic frameworks (COF) are deemed as disruptive membrane materials owing to their versatile functionalities, high stability and ordered nanochannels. However, the size mismatch between the COF intrinsic pore and gas molecules becomes a grand challenge when using COF membrane for carbon capture. Herein, we propose a new type of polymer-functionalized COF laminar membranes through grafting CO 2 -phlic polyethyleneimine (PEI) polymer onto carboxylic acid COF (cCOF) laminar membranes. The cCOF nanosheets with high density of carboxyl groups are prepared via modified single phase solution method and then assembled to fabricate membranes. Further, the cCOF membranes are functionalized with PEI using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide/N-Hydroxysuccinimide (EDC/NHS) coupling chemistry. The introduction of abundant amino groups from PEI afford the affinity of membranes toward CO 2 . Meanwhile, the graft of the PEI polymers reduces the defects or pinholes on the membrane surface. As a result, the PEI functionalized cCOF membranes exhibit a high CO 2 permeance of 1004 GPU and a CO 2 /N 2 selectivity of 33.7, which reach the carbon capture target performance and show great prospect for treating real flue gas. Our approach of functionalizing cCOF membranes with tailored functionalities may inspire the design of molecule-selective COF membranes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Zhou Qu,Yanni Liu,Haoran Wang,Qianxi Yang,Hongwei Fan,Hong Meng
Hetero-structured nanocomposite membranes have great potential in advanced gas separation due to the synergy of hierarchical pores. Herein, we report a MOF (metal–organic framework)-in-COF (covalent organic framework) layer supported on a polyacrylonitrile (PAN) ultrafiltration substrate prepared by a contra-diffusion reaction of MOF inside a one-dimensional (1D) pore-channels of COF layer. Such 1D confinement-induced membrane features a unique ultramicropore-in-nanopore structure, which intensifies the molecular sieving while preserving high-speed transfer pathways. The prepared ZIF-67-in-TAPB-BPDA-PAN membrane exhibited an excellent helium (He) permeance of ∼1500 GPU together with an enhanced separation selectivities of 3.89 for He/N 2 and 5.38 for He/CH 4 , respectively. The overall performance is competitive among the reported He-selective membranes. A continuous gas permeation test for 100 h indicates good stability. This work would bring insights into the engineering and preparation of nanocomposite functional materials applied in various separation fields.
研究领域:
材料科学
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化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 36
·19374-19383
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IF 11.9
Hukang Guo,Jianxiao Jiang,Chuanjie Fang,Liping Zhu
Covalent organic frameworks (COFs) with well-ordered nanopores and stable structures have excited exponential interest as potent membrane platforms for molecular separation in organic solvent systems. However, the fabrication of defect-free and crystalline COF membranes remains extremely challenging due to the poor processibility of COF powders. Herein, we report the facile in situ synthesis of highly crystalline COF membranes on the confined surface of porous substrates via contra-diffusion interfacial polymerization. The continuous imine-linked COF membranes with high structural rigidity exhibited robust chemical stability in organic solvents. The variable membrane thickness was achieved by tailoring the initial monomer concentration. Notably, the synthesized COF membranes displayed tunable solvent permeance and solute rejection with a linear dependence on their thickness. The linear relationship between the membrane thickness and pore tortuosity was further demonstrated, enabling the reasonable prediction of solvent permeance based on the pore-flow model. Owing to the regular hexagonal nanochannels, the COF membrane exhibited precise molecular sieving capability toward molecules with varying dimensions in the organic solvent. This work showcases the immense potential of crystalline COF membranes for molecular separation in harsh organic solvents.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
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