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化工学报  2014 

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, PP. 1673-1679

Keywords: 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

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Abstract:

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8.8μm;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298K、406kPa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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