Preparation of ZIF-8 membranes on ZnO modified stainless steel nets

doi:10.11949/j.issn.0438-1157.20180194

Abstract

Abstract:

ZIF-8 is one of the most perspective membrane materials for gas separation due to its regular pore size of 0.34 nm. Stainless steel nets (SSN) have the advantages of low price, easy cutting, and thin thickness as membrane substrates. In this work, ZnO buffering layer was synthesized on SSN substrate by hydrothermal method. ZIF-8 membranes were prepared on the ZnO modified SSN (ZnO/SSN) supports. ZnO/SSN supported ZIF-8 membranes were characterized by X ray diffraction (XRD) and scanning electron microscopy (SEM). The gas separation property of prepared ZIF-8 membranes was carried out. It is indicated that phase-pure and defect-free ZIF-8 membrane can be obtained on the ZnO/SSN substrate without additional activation step of ZnO layer. The ideal separation factors of H₂/CO₂, H₂/N₂ and H₂/CH₄ were 7.3, 9.2 and 12.4 at room temperature. The membrane demonstrates a good stability of permeability at 150℃.

Key words: ZIF-8 membrane, stainless steel net substrate, ZnO buffering layer, gas separation, hydrogen permselectivity

摘要：

ZIF-8因具有0.34 nm的孔道直径而被认为是最具应用前景的气体分离膜材料之一。不锈钢网（SSN）作为分离膜的支撑体具有价格低廉、易于裁剪、厚度薄等优点。采用水热法在SSN表面生长ZnO缓冲层，以ZnO修饰的SSN（ZnO/SSN）为支撑体制备ZIF-8膜。采用X射线衍射（XRD）和扫描电子显微镜（SEM）对合成的ZIF-8膜进行表征，并进行了气体渗透性能测试，结果表明，在ZnO颗粒修饰后的SSN支撑体上无需活化可制备出单一物相、无缺陷的ZIF-8膜；在室温（298 K）下，ZIF-8膜的H₂/CO₂、H₂/N₂、H₂/CH₄的理想分离系数分别为7.3、9.2、12.4；在150℃，ZIF-8膜的渗透性能稳定。

关键词: ZIF-8膜, 不锈钢网支撑体, ZnO缓冲层, 气体分离, 氢渗透选择性

CLC Number:

O614

LI Jia, GU Jinghua, YIN Wenjie, LI Zeyao. Preparation of ZIF-8 membranes on ZnO modified stainless steel nets[J]. CIESC Journal, 2018, 69(8): 3724-3731.

李甲, 谷景华, 殷文杰, 李泽耀. ZnO修饰的不锈钢网支撑体上ZIF-8膜的制备[J]. 化工学报, 2018, 69(8): 3724-3731.

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