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- Title
Cellulose membranes with polyethylenimine-modified graphene oxide and zinc ions for promoted gas separation.
- Authors
Hou, Ting; Shu, Lian; Guo, Kechun; Zhang, Xiong-Fei; Zhou, Shuai; He, Ming; Yao, Jianfeng
- Abstract
Cellulose-based mixed-matrix membranes containing polyethylenimine-modified graphene oxide (PEI-GO) and Zn2+ ions were fabricated and used for gas separation. The incorporation of PEI-GO effectively hinders the crystallinity of regenerated cellulose, and PEI-GO was compatible with cellulose matrix and uniformly distributed within the matrix. X-ray photoelectron spectrum revealed the amino group on GO surface can effectively coordinate with Zn2+ ions in the membrane. The Zn2+ ions content in the membranes increased when increasing the PEI-GO addition. The optimum separation performance was achieved over the membrane with 17 wt‰ PEI-GO (RC-17) wiht the highest zinc content of 24.2 wt%. The corresponding permeability of CO2 is as high as 268.9 Barrer, and the CO2/N2 and CO2/CH4 ideal selectivities could reach 48.9 and 57.4, respectively. The enhancement of CO2 transportation was attributed to both the regulated microstructure of cellulose membrane by PEI-GO and the π-complexation mechanism of Zn2+ ions with CO2 molecules. The prepared membranes would have a highly potential use in the field of CO2 separation.
- Subjects
SEPARATION of gases; GRAPHENE oxide; ZINC ions; CELLULOSE; X-ray photoelectron spectra; ZINC oxide; ZINC alloys; ZINC compounds synthesis
- Publication
Cellulose, 2020, Vol 27, Issue 6, p3277
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-019-02962-4