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Fabrication and Separation Performance of Two-Dimensional MXene Nanochannel Membranes

Authors： Wang Bo, Sun Kuo, Zhang Gang, Sun Chunyi, Wang Xueling, Dong Yingchao

Units： 1Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China) （2School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China

KeyWords： Water treatment; Two-dimensional (2D) material membranes; MXene nanochannel membrane; Anti-swelling; Desalination; Emerging contaminant

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(5):20-27

Abstract：

Water scarcity is one of the key challenges that limit social and industrial development. Separation membranes constructed with two-dimensional (2D) materials show promising potential in water treatment applications due to their excellent separation performance and tunable microstructure. However, there are some issues of high-quality fabrication and swelling for current 2D materials membranes. To address these issues, in this study, a modified carbon nanotubes (CNTs) interlayer (0.34 μm) was introduced onto porous alumina (Al2O3) ceramic substrates via vacuum filtration to provide more binding sites and stronger binding forces for high-quality top-layer formation. Then MXene (Ti3C2Tx) membranes were fabricated on them via vacuum filtration, followed by a thermal cross-linking strategy at 180 ℃. Anti-swelling ability was improved, though both channel size and permeability were reduced during thermal cross-linking process. The MX-180 membrane exhibits a nanochannel size of 5.0 Å, pure water permeance of 8.3 L·m-2·h-1·MPa-1 under the nanofiltration test at 0.1-0.5 MPa pressure, and the rejections of 67.87%, 79.99%, 85.66%, 91.34% for KCl, NaCl, MgCl2, tetracycline indicating promising separation performance and anti-swelling stability.

Funds：

国家重点研发专项(No. 2019YFA0705803)、兴辽英才项目(No. XLYC1807250)、国家自然科学基金(No. 21876020和No. 52070033)和企业横向课题(No.HX20190810)

AuthorIntro：

汪波（1998-），男，安徽六安人，硕士研究生，研究方向为二维纳米通道的构筑及离子分离研究，E-mail：wang6719@foxmail.com

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