Inorganic Chemicals Industry ›› 2021, Vol. 53 ›› Issue (10): 74-80.doi: 10.19964/j.issn.1006-4990.2020-0658

• Research & Development • Previous Articles     Next Articles

Study on preparation of GO-TSC/polyimide mixed matrix membrane and its gas separation performance

Guo Xin1(),Yi Hualei1,Yuan Weiliang2,3,Hao Yun1,Duan Cuijia2,Chen Zan2   

  1. 1. CNOOC Research Institute Ltd,Beijing 100028,China
    2. CenerTech Tianjin Chemical Research and Design Institute Co.,Ltd.
    3. Hebei University of Technology
  • Received:2020-12-07 Online:2021-10-10 Published:2021-10-11

Abstract:

Graphene oxide(GO) was modified using thiosemicarbazide(TSC) for the fabrication of flat sheet GO-TSC cmpo-site.Subsequently,this composite was incorporated into the Matrimid®5218(PI) matrix to fabricate mixed matrix membranes(MMMs) for CO2 separation.Through TGA,SEM and gas separation performance tests,influence of GO-TSC on thermal sta-bility,structure and gas separation performance of the mixed matrix membrane was investigated.SEM showed that GO-TSC could be uniformly dispersed in the polymer matrix and tightly combined with the matrix;TGA result showed that decomposi-tion temperature of mixed matrix membranes was above 250 ℃.MMMs showed significantly enhanced CO2 permeability com-pared with pure PI membrane.The amino group contained in GO-TSC had a good affinity with CO2,and the increased amidogen sites could effectively transport CO2.The GO-TSC lamellar structure increased the gas transmission path,which was not conducive to the passage of large dynamic diameter gases(CH4,N2),thereby improving the separation performance.The MMMs doped with GO-TSC-0.75% showed optimal gas separation performance.Compared with pure PI membrane,the CO2 permeability,CO2/CH4 selectivity and CO2/N2 selectivity of the MMMs were increased by 42.16%,95.79% and 83.72%,respectively.

Key words: graphene oxide, polyimide, mixed matrix membrane, gas separation

CLC Number: