Citation: NG Jin-Hua, WANG Chen-Hui, BIAN Zi-Jun, YANG Li, HU Jun, LIU Hong-Lai. Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO₂/N₂ and CO₂/CH₄ Separations[J]. Acta Physico-Chimica Sinica, ;2015, 31(10): 1963-1970. doi: 10.3866/PKU.WHXB201508282 shu

Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO₂/N₂ and CO₂/CH₄ Separations

1.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China

Received Date: 12 June 2015
Available Online: 28 August 2015
Fund Project: 国家重点基础研究发展规划项目(973) (2013CB733501) (973) (2013CB733501)国家自然科学基金项目(91334203, 21376074)资助 (91334203, 21376074)

Membranes with both od permeation and selectivity are highly desired for gas separations. We synthesized a polyimide (PI) asymmetric membrane using the phase-inversion method, and then modified the surface with a mixture of porous fillers and poly(amic acid) (PAA). The porous fillers included the metal organic framework (MOF) of Cu₃(BTC)₂ (copper benzene-1,3,5-tricarboxylate), the zeolite imidazole framework (ZIF) of ZIF-8, and the porous hydrotalcite of MgAl-LDH. A series of asymmetric mixed-matrix membranes (MMMs) were obtained after surface coating and thermal amidation. The MMM structure, CO₂, CH₄, and N₂ permeance, and the ideal gas selectivity were investigated. With the surface modification, the morphology of the surface separation layers of the asymmetric PI/ZIF-8, PI/LDH, and PI/Cu₃(BTC)₂ MMMs significantly changed, and the gas separation performance changed accordingly. The PI/ZIF-8 asymmetric MMM with 5% (w) ZIF-8 doping exhibited both enhanced ideal gas selectivity and permeance; the CO₂/N₂ and CO₂/CH₄ selectivity were as high as 24 and 83, respectively. Thus, this surface modification provides improved MMM gas separation performance.
- Mixed matrix membrane,
- Gas separation,
- Surface modification,
- Polyimide,
- ZIF-8
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沈阳化工大学材料科学与工程学院沈阳 110142

Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO2/N2 and CO2/CH4 Separations

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通讯作者: 陈斌, bchen63@163.com

Asymmetric Polyimide Mixed Matrix Membranes with Porous Materials-Modified Surfaces for CO₂/N₂ and CO₂/CH₄ Separations