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

作者：He, Ming; Yao, Jianfeng^*; Li, Lunxi; Zhong, Zhaoxiang; Chen, Fanyan; Wang, Huanting

来源：Microporous and Mesoporous Materials, 2013, 179: 10-16.

DOI：10.1016/j.micromeso.2013.05.015

• ZIF-8 film
• Synthesis
• Nylon membrane
• Aqueous solution
• Contra-diffusion

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.

• 出版日期2013-9-15
• 单位南京林业大学