Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (6): 1495-1500.doi: 10.3866/PKU.WHXB2016032803

• ARTICLE • Previous Articles     Next Articles

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

Xiao-Lei LI1,2,Shuo TAO1,2,Ke-Da LI1,Ya-Song WANG1,2,Ping WANG1,2,Zhi-Jian TIAN1,3,*()   

  1. 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:2016-01-12 Published:2016-06-03
  • Contact: Zhi-Jian TIAN E-mail:tianz@dicp.ac.cn
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(21373214);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA07020300)

Abstract:

ZIF-8 membranes were prepared on α-alumina substrates in a urea/choline chloride(ChCl)baseddeep eutectic solvent using an in situ method.The synthesized ZIF-8 membranes were characterized using Xraydiffraction(XRD)and scanning electron microscopy(SEM).The effects of the concentration of the reactionsolution and the cooling rate on ZIF- 8 membrane synthesis were investigated.The results indicate thatincreasing the concentration of the reaction solution and reducing the cooling rate are beneficial for synthesizingcontinuous ZIF-8 membranes.A continuous and compact ZIF-8 membrane with a thickness of about 8 μm wasobtained on the substrate by optimizing the synthetic conditions.The single gas permeation and binary mixturegas separation performances of the ZIF-8 membrane prepared under the optimized synthetic conditions weredetermined 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 theseparation factors exceed the corresponding Knudsen diffusion coefficients,indicating that the ZIF-8 membranedisplays molecular sieving performance.

Key words: Metal-organic framework, Deep eutectic solvent, ZIF-8 membrane, Gas separation, Molecular sieving

MSC2000: 

  • O647