Citation: LI Xiao-Lei, TAO Shuo, LI Ke-Da, WANG Ya-Song, WANG Ping, TIAN Zhi-Jian. In situ Synthesis of ZIF-8 Membranes with Gas Separation Performance in a Deep Eutectic Solvent[J]. Acta Physico-Chimica Sinica, ;2016, 32(6): 1495-1500. doi: 10.3866/PKU.WHXB2016032803 shu

In situ Synthesis of ZIF-8 Membranes with Gas Separation Performance in a Deep Eutectic Solvent

LI Xiao-Lei ^1,2, ,
TAO Shuo ^1,2 ,
LI Ke-Da ¹ ,
WANG Ya-Song ^1,2 ,
WANG Ping ^1,2 ,
TIAN Zhi-Jian ^1,3

1.
National Laboratory of Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China;
2.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
3.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China

Received Date: 12 January 2016
Revised Date: 28 March 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21373214) and Strategic Priority Research Program of the Chinese Academy of Sciences (XDA07020300).

ZIF-8 membranes were prepared on α-alumina substrates in a urea/choline chloride (ChCl) based deep eutectic solvent using an in situ method. The synthesized ZIF-8 membranes were characterized using Xray diffraction (XRD) and scanning electron microscopy (SEM). The effects of the concentration of the reaction solution and the cooling rate on ZIF-8 membrane synthesis were investigated. The results indicate that increasing the concentration of the reaction solution and reducing the cooling rate are beneficial for synthesizing continuous ZIF-8 membranes. A continuous and compact ZIF-8 membrane with a thickness of about 8 μm was obtained on the substrate by optimizing the synthetic conditions. The single gas permeation and binary mixture gas separation performances of the ZIF-8 membrane prepared under the optimized synthetic conditions were determined using the Wicke-Kallenbach technique. For equimolar gas mixtures at room temperature (293 K), the separation factors for H₂/CO₂, H₂/O₂, H₂/N₂, and H₂/CH₄ were 7.4, 5.2, 9.1, and 13.8, respectively. All the separation factors exceed the corresponding Knudsen diffusion coefficients, indicating that the ZIF-8 membrane displays molecular sieving performance.
- Metal-organic framework,
- Deep eutectic solvent,
- ZIF-8 membrane,
- Gas separation,
- Molecular sieving
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