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化工学报  2015 

层层组装晶种法制备Mg-MOF-74膜及其分离性能

DOI: 10.11949/j.issn.0438-1157.20140988, PP. 478-485

Keywords: ,微观结构,晶化,Mg-MOF-74晶体膜,层层组装

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Abstract:

以2,5-二羟基对苯二甲酸和乙酸镁溶液为原料通过交替浸渍层层组装法在a-Al2O3载体表面预置晶种层,再利用二次生长法制备出连续而致密的Mg-MOF-74晶体膜。采用X射线衍射(XRD)和扫描电镜(SEM)对膜进行了表征。实验结果表明:相比于原位溶剂热合成法,通过2,5-二羟基对苯二甲酸和乙酸镁交替浸渍层层组装法可以增强Mg-MOF-74与氧化铝基体之间的附着效果,提高晶体薄膜的致密性与连续性,实验发现4次交替浸渍层层组装预置晶种可以制备出具有分子筛分性能的Mg-MOF-74晶体膜,单组分气体渗透测试表明其H2/CO2的理想选择性可以达到8.96,高于其努森扩散选择性。XRD测试表明该晶体膜的特征衍射峰与文献报告的粉末MOF-74完全一致,表明Mg-MOF-74晶粒以无取向形式生长于氧化铝载体表面。SEM表征表明Mg-MOF-74晶粒呈麦粒状微观外形,其BET比表面积可以达到1182m2·g-1。

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