title: Mixed-Matrix Membranes Containing Carbon Nanotubes Composite with Hydrogel for Efficient CO2Separation.
abstract: In this study, a carbon nanotubes composite coated with N-isopropylacrylamide hydrogel (NIPAM-CNTs) was synthesized. Mixed-matrix membranes (MMMs) were fabricated by incorporating NIPAM-CNTs composite filler into poly(ether-block-amide) (Pebax MH 1657) matrix for efficient CO2separation. The as-prepared NIPAM-CNTs composite filler mainly plays two roles: (i) The extraordinary smooth one-dimensional nanochannels of CNTs act as the highways to accelerate CO2transport through membranes, increasing CO2permeability; (ii) The NIPAM hydrogel layer coated on the outer walls of CNTs acts as the super water absorbent to increase water content of membranes, appealing both CO2permeability and CO2/gas selectivity. MMM containing 5 wt % NIPAM-CNTs exhibited the highest CO2permeability of 567 barrer, CO2/CH4selectivity of 35, and CO2/N2selectivity of 70, transcending 2008 Robeson upper bound line. The improved CO2separation performance of MMMs is mainly attributed to the construction of the efficient CO2transport pathways by NIPAM-CNTs. Thus, MMMs incorporated with NIPAM-CNTs composite filler can be used as an excellent membrane material for efficient CO2separation.
authors.affiliation: Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University , Xinjiang, Shihezi 832003, China.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University , Xinjiang, Shihezi 832003, China.
authors.forename: Ruili
authors.initials: R
authors.lastname: Guo
authors.affiliation: Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University , Xinjiang, Shihezi 832003, China.
authors.forename: Jinpeng
authors.initials: J
authors.lastname: Hou
authors.affiliation: Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University , Xinjiang, Shihezi 832003, China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Wei
authors.affiliation: Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University , Xinjiang, Shihezi 832003, China.
authors.forename: Xueqin
authors.initials: X
authors.lastname: Li
keywords: CO2 separation; N-isopropylacrylamide; Pebax; carbon nanotubes; mixed matrix membrane