期刊
CERAMICS INTERNATIONAL
卷 42, 期 7, 页码 8949-8954出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.02.153
关键词
Silicon nitride hollow fiber; Composite membrane; ZIF-8 membrane; Gas separation; CO2 adsorption
资金
- National Natural Science Foundation of China [51372238, 21271164]
- National Basic Research Program of China (973 Program) [2012CB922004]
- CAS Strategic Priority Research Program [XDB10030402]
Zeolitic imidazolate frameworks (ZIFs) have attracted great attention due to their potential applications in gas adsorption, catalytic membrane reactors, chemical sensing and gas separation. To achieve the massive industrial application, a number of attempts have been made to prepare supported-ZIF membranes. We successfully synthesized a well-intergrown continuous ZIF-8 membrane on the outer surface of silicon nitride hollow fibers by a one-step hydrothermal method. Through controlling ZIF-8 nucleation and growth rates, the membranes were compact and well-coated. Single gas permeation of H-2, N-2 and CO2 at 25 degrees C, 0.25 MPa indicated the sieving behavior of the obtained membranes. N-2 permeance did not change with permeation time, while H-2 permeance increased in the beginning and keep steady at 8.35 x 10(-7) mol/m(2) Pa s due to the high storage properties of ZIF-8, and CO2 permeance decreased in the first hour, then maintained at 1.15 x 10(-7) mol/m(2) Pa s due to the strong CO2 adsorption in the ZIF-8 and the cooperative interactions of adsorbed CO2 molecules with CO2 passing through. The H-2/CO2 separation factor of 11.67 could be achieved in the separation of 50%H-2/50%CO2 mixture. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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