| 二次生长法制备ZIF-8膜及其对CO2/N2的分离性能 |
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| 引用本文： | 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, 2014, 65(5): 1673-1679. DOI: 10.3969/j.issn.0438-1157.2014.05.017 |
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| 作者姓名： | 赵祯霞 许锋 李忠 |
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| 作者单位： | 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 |
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| 基金项目： | 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。 |
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| 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。
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| 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 |
| 收稿时间： | 2014-01-21 |
| 修稿时间： | 2014-03-12 |
Gas separation properties of zeolitic imidazolate framework-8 membranes prepared by secondary synthesis |
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| ZHAO Zhenxia,XU Feng,LI Zhong. Gas separation properties of zeolitic imidazolate framework-8 membranes prepared by secondary synthesis[J]. Journal of Chemical Industry and Engineering(China), 2014, 65(5): 1673-1679. DOI: 10.3969/j.issn.0438-1157.2014.05.017 |
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| Authors: | ZHAO Zhenxia XU Feng LI Zhong |
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| Affiliation: | 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 |
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| 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 CO2 over N2 with 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 CO2 over N2 could reach 6 at 298 K, 406 kPa, and CO2 content of 50%, exceeding the Knudsen diffusion selectivity. |
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| Keywords: | ZIF-8 membrane secondary growth gas permeation CO2/N2 mixture gases separation performance |
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