Water permeability in MXene membranes: Process matters  

作　　者：Hang Zhou Yuwei Wang Fuqiang Wang Hao Deng Yongchen Song Changping Li Zheng Ling 

机构地区：[1]Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,School of Energy&Power Engineering,Dalian University of Technology,Dalian 116024,China [2]Research Center for Eco-Environmental Engineering,Dongguan University of Technology,Dongguan 523808,China

出　　处：《Chinese Chemical Letters》2020年第6期1665-1669,共5页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51606027,51436003,51890911);the Fundamental Research Funds for the Central Universities of China,the National Key Research and Development Program of China(Nos.2017YFC0307300,2016YFC0304001);the project funded by China Postdoctoral Science Foundation。

摘　　要：Recent studies have shown impressive transport behaviors of water and ions within lamellar MXene membranes,which endows great promise in developing advanced separation application based high performance MXene membranes.However,most of the researches focused on modification of MXene nanoflakes and optimizing interlayer distance,leaving the impact of membrane fabrication process marginal.In this work,we studied the water flux of membranes made by vacuum filtration using delaminated MXene nanoflakes as the building-blocks.Our results show that the water permeability is extremely sensitive to the process,especially at the drying process,loading and deposit rate of nanoflakes(the feeding concentration).We find that the voids from less ordered stack rather than in-plane defects and interlayer galleries contribute to the large water permeability.The voids can be effectively avoided via deposition of MXene nanoflakes at a slow rate.Manipulating the stack of MXene nanoflakes during vacuum filtration and drying are critical for development of MXene membranes with desired performance for water permeation.

关 键 词：EXFOLIATION MXene Two-dimensional materials Water permeability Water treatment 

分 类 号：TQ051.893[化学工程]