膜科学与技术

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Preparation and performance of polyacrylonitrile-based
asymmetric porous carbon molecular sieve membranes

Authors： JIN Xin1,2, XU Ruisong2, YANG Weiya1, LI Lin2, WANG Tonghua2

Units： 1. SINOPEC Dalian Research Institute of Petroleum and Petrochemicals, Dalian 116041, China; 2. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

KeyWords： carbon molecular sieve membrane; polyacrylonitrile; asymmetric porous membrane； gas separation membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2025,45(4):25-31

Abstract：

In this work, polyacrylonitrile (PAN) was utilized as a precursor to fabricate asymmetric porous polymer membranes via the phase inversion method. Subsequently, oxidative pretreatment and high-temperature carbonization (500~800 ℃) were employed to successfully develop PAN-based asymmetric porous carbon molecular sieve membranes. A combination of characterization techniques was applied to systematically investigate the evolutionary mechanisms of chemical structures, carbon microstructures, membrane morphologies, and pore architectures during thermal treatment. Experimental results revealed that oxidative pretreatment induced the formation of a ladder-type cross-linked network structure within molecular chains, effectively mitigating pore collapse during carbonization. The resulting carbon membranes retained the three-dimensional interconnected pore channels inherited from the precursor polymer membrane. The disordered and loosely stacked carbon layers facilitated enhanced gas molecule permeation. The PAN-derived porous carbon membrane carbonized at 800 ℃ exhibited an exceptional O2 permeance of 1 166 GPU with an O2/N2 selectivity of 1.10, surpassing the theoretical Knudsen diffusion limit. This work validates the feasibility of PAN as a cost-effective support layer material and provides experimental insights for developing high-performance hollow fiber composite carbon membranes.

Funds：

国家重点研发计划(2021YFB3801200); 国家自然科学基金(22278051, 22178044, 22378043)

AuthorIntro：

金鑫（1989-），女，辽宁大连人，工程师，博士，主要研究方向为分子筛材料、膜材料

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