Nanoporous Structure Derived from Halloysite Incorporated into Pebax Matrix for Gas Separation
SUN Yanyong1,2, ZHU Weifang1,2, GOU Minmin1,2, GUO Ruili1,2
1 School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China 2 Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, Shihezi 832003, China
Abstract: Two kinds of modified materials, S-HNTs and H-HNTs, were obtained by selective etching of halloysite with sulfuric acid (H2SO4) and hydrochloric acid (HCl) based on the different chemical properties of the inner and outer structures of halloysite nanotubes (HNTs). And the two different nanoporous structure derived from HNTs were incorporated into Pebax MH 1657 (Pebax) to make mixed matrix membranes (MMMs). The pure CO2 and CH4 gas permeability results showed that, Pebax-S-HNTs MMMs and Pebax-H-HNTs MMMs had the best gas permeation performance when the filling amount was 6wt% and 8wt%, respectively. Compared with pure membrane, the permeability of CO2 in Pebax-S-HNTs MMMs and Pebax-H-HNTs MMMs increased by 97.8% and 125.3% respectively, and the separation factor of CO2/CH4 increased by 69.7% and 40.0% respectively. The improvement of gas separation performance is mainly due to the successful pore expansion of HNTs and the existence of micro/mesoporous graded porous structure. Firstly, the selective etching of HNTs results in the increase of the cavity size of HNTs and which makes the increase of gas permeability; secondly, the existence of multi-layer micro/mesoporous multi-stage pore structure provides a variety of transmission paths for gas diffusion, and the existence of zigzag paths promotes the increase of gas selectivity.
1 Zhang Z, Luo D, Lui G, et al. Carbon,2019,143,531. 2 Huang G, Isfahani A P, Muchtar A, et al. Journal of Membrane Science,2018,565,370. 3 Wang Y, Zhang X, Li J, et al. Journal of Membrane Science,2019,573,602. 4 Hou J, Li X, Guo R, Zhang J, Wang Z. Nanotechnology,2018,29(12),125706. 5 Thankamony R L, Li X, Das S K, et al. Journal of Membrane Science,2019,591,117348 6 Molavi H, Shojaei A, Mousavi S A. Journal of Materials Chemistry A,2018,6(6),2775. 7 Merkel T C, Freeman B D, Spontak R J, et al. Science,2002,296(5567),519. 8 Lee J H, Hong J, Kim J H, et al. Chemical Communications,2012,48(43),5298. 9 Zhao H, Feng L, Ding X, et al. Journal of Membrane Science,2018,564,800. 10 Liu G, Labreche Y, Chernikova V, et al. Journal of Membrane Science,2018,565,186. 11 Thür R, Van Velthoven N, Slootmaekers S, et al. Journal of Membrane Science,2019,576,78. 12 Xin Q, Zhang Y, Huo T, et al. Journal of Membrane Science,2016,508,84. 13 Li T, Pan Y, Peinemann K V, et al. Journal of Membrane Science,2013,425,235. 14 Liu Y, Peng D, He G, et al. ACS Applied Materials & Interfaces,2014,6(15),13051. 15 Yang L, Zhang S, Wu H, et al. Journal of Membrane Science,2019,573,301. 16 Liu M, He R, Yang J, et al. ACS Applied Materials & Interfaces,2016,8(12),7709. 17 Liu M, Jia Z, Jia D, et al. Progress in Polymer Science,2014,39(8),1498. 18 Fares M L, Athmani M, Khelfaoui Y, et al. IOP conference series: mate-rials science and engineering, IOP Publishing,2012,pp.28. 19 Hashemifard S A, Ismail A F, Matsuura T. Journal of Colloid and Interface Science,2011,359(2),359. 20 Abdullayev E, Joshi A, Wei W, et al. ACS Nano,2012,6(8),7216. 21 Shu Z, Chen Y, Zhou J, et al. Applied Clay Science,2015,112,17. 22 Zhu W, Qin Y, Wang Z, et al. Journal of Energy Chemistry,2019,31,1. 23 Wang Z, Hou J, Guo R, et al. Journal of the Chinese Chemical Society,2018,65(11),1347. 24 Kadi S, Lellou S, Marouf-Khelifa K, et al. Microporous and mesoporous materials,2012,158,47. 25 White R D, Bavykin D V, Walsh F C. Nanotechnology,2012,23(6),065705. 26 Joussein E, Petit S, Churchman J, et al. Clay Mineralsed,2005,40,383. 27 Zhang A B, Pan L, Zhang H Y, et al. Colloids and Surfaces A: Physicochemical and Engineering Aspects,2012,396,182.
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2021, Vol. 35 
