二次生长法制备ZIF-8膜及其对CO2/N2的分离性能

doi:10.3969/j.issn.0438-1157.2014.05.017

化工学报

二次生长法制备ZIF-8膜及其对CO₂/N₂的分离性能

赵祯霞¹, 许锋², 李忠²

1 广西大学广西石化资源加工及过程强化技术重点实验室, 广西南宁 530004;
2 华南理工大学化学与化工学院, 广东广州 510640

收稿日期:2014-01-21 修回日期:2014-03-12 出版日期:2014-05-05 发布日期:2014-05-05
通讯作者: 李忠
基金资助:
国家重大科技专项（2013CB733506）；广西大学科研基金项目（XGZ130963）；国家自然科学基金面上项目（21276092，21376090）；亚热带建筑科学国家重点实验室自主研究课题项目（C713001z）；广西石化资源加工及过程强化技术重点实验室项目。

Gas separation properties of zeolitic imidazolate framework-8 membranes prepared by secondary synthesis

ZHAO Zhenxia¹, XU Feng², LI Zhong²

1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China;
2 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China

Received:2014-01-21 Revised:2014-03-12 Online:2014-05-05 Published:2014-05-05
Supported by:
supported by the National Key Basic Research Program of China (2013CB733506), the Scientific Research Foundation of Guangxi University (XGZ130963),the National Natural Science Foundation of China (21276092,21376090), the Research Foundation of State Key Laboratory of Subtropical Building Science of China (C713001z) and Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology.

摘要/Abstract

摘要： 采用二次生长法在α-Al₂O₃载体上制备超薄型ZIF-8膜，研究了多种轻分子气体以及混合气体CO₂/N₂的渗透分离性能。通过SEM和XRD表征了ZIF-8晶种层的晶种涂布状态，以及ZIF-8晶体膜的生长覆盖度和晶膜厚度。研究结果表明：采用低浓度的晶种悬浮液通过浸润式连续多次涂布法，有利于获得晶种层厚度均匀且覆盖度高的超薄均匀ZIF-8晶种层，经过二次生长后所得ZIF-8膜的覆盖度高、厚度均匀且较薄，仅约为8.8 μm；在所测试范围内的CO₂/N₂混合气体中，此ZIF-8膜对CO₂具有优先选择透过性，其对CO₂/N₂的渗透分离因子随温度的升高而降低，随渗透压力的增加而增加，在298 K、406 kPa和CO₂组分含量为50%时，该分离因子能达到6，显著超过Knudsen扩散的分离系数。

关键词: ZIF-8膜, 二次生长法, 气体渗透扩散行为, CO₂/N₂混合气, 分离性能

Abstract: Permeation and separation properties for CO₂/N₂ mixtures with high quality, thin (～8.8 μm) zeolitic imidazolate framework-8 (ZIF-8) membranes prepared by the secondary growth method were studied at different temperatures and feed pressures. The crystal structure, surface coverage, uniformity of the prepared ZIF-8 seeding layers and membranes were characterized by using SEM and XRD. The low concentration of the seed suspension and subsequent dip-coating method helped to obtain a more uniform, continuous and ultrathin ZIF-8 seeds layer of support; the synthesized ZIF-8 membranes offered selective permeation for CO₂over N₂with CO₂/N₂ mixture feed under the experimental conditions studied. The separation factor of CO₂/N₂ mixed gas through a ZIF-8 film decreased with increasing temperature, but increased with increasing feed pressure. Its separation factor of CO₂over N₂could reach 6 at 298 K, 406 kPa, and CO₂ content of 50%, exceeding the Knudsen diffusion selectivity.

Key words: ZIF-8 membrane, secondary growth, gas permeation, CO₂/N₂ mixture gases, separation performance

中图分类号:

TQ028.1⁺4

赵祯霞, 许锋, 李忠. 二次生长法制备ZIF-8膜及其对CO₂/N₂的分离性能[J]. 化工学报, DOI: 10.3969/j.issn.0438-1157.2014.05.017.

ZHAO Zhenxia, XU Feng, LI Zhong. Gas separation properties of zeolitic imidazolate framework-8 membranes prepared by secondary synthesis[J]. CIESC Journal, DOI: 10.3969/j.issn.0438-1157.2014.05.017.

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二次生长法制备ZIF-8膜及其对CO₂/N₂的分离性能

Gas separation properties of zeolitic imidazolate framework-8 membranes prepared by secondary synthesis

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