Aqueous solution synthesis of ZIF-8 films on a porous nylon substrate by contra-diffusion method

被引：68

作者：

He, Ming ^{[1
,2
]}

Yao, Jianfeng ^{[2
]}

Li, Lunxi ^{[2
]}

Zhong, Zhaoxiang ^{[2
]}

Chen, Fanyan ^{[2
]}

Wang, Huanting ^{[2
]}

机构：

[1] Nanjing Forestry Univ, Coll Sci, Nanjing 210037, Jiangsu, Peoples R China

[2] Monash Univ, Dept Chem Engn, Clayton, Vic 3800, Australia

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2013年 / 179卷

基金：

澳大利亚研究理事会;

关键词：

ZIF-8; film; Synthesis; Nylon membrane; Aqueous solution; Contra-diffusion; ZEOLITIC IMIDAZOLATE FRAMEWORKS; METAL-ORGANIC FRAMEWORK; CAPTURE PROPERTIES; MEMBRANES; SEPARATION; FUNCTIONALITY;

D O I：

10.1016/j.micromeso.2013.05.015

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

ZIF-8 films were prepared on both sides of nylon membrane in aqueous solutions using a stoichiometric ratio of Zn2+ and 2-methylimidazole (hmim) by a contra-diffusion method. Both ammonium hydroxide solution and porous nylon membrane play a crucial role in promoting ZIF-8 crystallization and film formation. Ammonium hydroxide solution added in the hmim solution deprotonates hmim, and the nylon membrane separates the Zn2+ and hmim aqueous solutions with different diffusion rates through its pores, leading to appropriate concentration gradients of hmim and zinc nitrate required for ZIF-8 nucleation and growth. The synthesis conditions were systematically investigated. ZIF-8 films prepared with a Zn2+:hmim:NH4+ molar ratio of 1:2:32 at room temperature for 24 h exhibited an intergrown ZIF-8 layer on hmim side with a thickness of ca. 2.5 mu m, and gas permeation confirmed the film was continuous and compact with a H-2/N-2 ideal selectivity of 4.6. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：10 / 16

页数：7

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