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Zn nanosheet-derived ultrathin ZIF-8 membrane for high-permeance C3H6 separation
Authors： JI Taotao1, YANG Shuo2, QIN Lei1, LIU Yi3, CHEN Liang1
Units： 1. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC 
Shanghai Research Institute of Petrochemical Technology Co., Ltd., Shanghai 201208, China;
 2. China Nuclear Power Engineering Co., Ltd., Beijing 100089, China; 3. State Key Laboratory 
of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
KeyWords：  Zn5(OH)8(NO3)2 nanosheet; ZIF-8 membrane; ultrathin; C3H6/C3H8 separation; high-permeance
ClassificationCode：TQ028; TQ051.893
year,volume(issue):pagination： 2026, 46(4):24-31

Abstract：

 To address the low C3H6 permeance of ZIF-8 membranes in C3 separations, an ultrathin ZIF-8 membrane fabrication strategy based on the in situ conversion of Zn5(OH)8(NO3)2 (ZHN) nanosheets was proposed. High-aspect-ratio ZHN nanosheets were first synthesized and subsequently deposited onto a porous support via vacuum filtration to construct a continuous conversion layer. The ZIF-8 membrane with a thickness of 200 nm was then obtained through in situ conversion in ligand solution. During the conversion process, ZHN served not only as the Zn source to regulate the nucleation and growth kinetics of ZIF-8, but also as a template to induce heterogeneous nucleation, thereby enabling highly intergrown ZIF-8 crystals and precise control over membrane thickness. As a result, the obtained ZIF-8 membrane exhibited excellent C3H6/C3H8 separation performance, with a separation factor of 16.9 and a C3H6 permeance of 1.04×10-7 mol/(m2·s·Pa）. Compared with similar membranes reported in the literature, the present membrane achieved an approximately one order of magnitude enhancement in C3H6 permeance while maintaining effective selectivity. This strategy enables the synergistic optimization of membrane intergrowth and ultrathin thickness, providing an effective route for the fabrication of high-permeance ZIF-8 membrane. 

Funds：

 国家自然科学基金面上项目（22478056）

AuthorIntro：
纪涛涛（1994-），男，河南驻马店人，助理研究员，主要研究方向为化工分离过程.*通讯作者，刘毅，E-mail：diligenliu@dlut.edu.cn；陈亮，E-mail：chenl.sshy@sinopec.com

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