埃洛石纳米管结构改性后用于Pebax基质中强化气体分离

doi:10.11896/cldb.19120088

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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.

Key words： halloysite nanotubes (HNTs) polyether block polyamide (Pebax) selective-etching mixed matrix membranes CO₂ separation

Published: 23 March 2021

CLC number:

TQ028

Fund:Funds for “Dual First-Class” Discipline of Shihezi University (SHYL-ZD201804).

About author:: Yanyong Sun is studying at Shihezi University and pursuing his master's degree. His research interest is gas membrane separation.
Ruili Guo received her PhD. degree in July 2007 from Tianjin University in engineering. She is currently a professor in Shihezi University, focusing on the research of membrane material, membrane separation technology and its application.

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	SUN Yanyong
	ZHU Weifang
	GOU Minmin
	GUO Ruili

Cite this article:

SUN Yanyong,ZHU Weifang,GOU Minmin, et al. Nanoporous Structure Derived from Halloysite Incorporated into Pebax Matrix for Gas Separation[J]. Materials Reports, 2021, 35(6): 6174-6179.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19120088 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6174

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