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Preparation and Characterization of Two-dimension Vermiculite Membranes with Excellent Water Stability

Authors： CAO Min, LIU Zhuang, XIE Rui, JU Xiaojie, WANG Wei, CHU Liangyin

Units： 1School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China; 2State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, Sichuan, China

KeyWords： vermiculite membrane; two-dimensional material; stability; water flux

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(5):58-63

Abstract：

In this paper, vermiculite (VMT) membranes with stable interlayer spacing are prepared by the electrostatic interaction between divalent cations and negatively charged vermiculite sheets. The morphology and elemental distribution of the vermiculite films are investigated by SEM, EDX. The stability of VMT-Li membranes and VMT-Ca membranes are investigated. The insight of the stability of the vermiculite membranes is taken in the interlayer spacing by XRD. The intrinsic diffusion rate of water molecules though the membrane was obtained by measuring the water vapor diffusion flux of the membrane. The results show that both the VMT-Li film and the VMT-Ca film have a typical layered structure, and the surface of the membranes demonstrates no obvious defects. VMT-Ca membrane has excellent stability in both aqueous and salt solutions, and the water vapor diffusion fluxes of VMT-Li membrane and VMT-Ca membrane are 24.12 g/(h·m2) and 18.17 g/(h·m2). This work lays a foundation for the study of interlayer ion transport in vermiculite films.

Funds：

国家自然科学基金项目(22022810, 21776182)

AuthorIntro：

曹敏（1997—），女，四川省泸州市人，硕士研究生，研究方向为功能膜材料，E-mail:1561038783@qq.com.

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