Tuning the Water Desalination Performance of Graphenic Layered Nanomaterials by Element Doping and Inter-Layer Spacing  

作　　者：Fuxin Wang Chao Zhang Yanmei Yang Yuanyuan Qu Yong-Qiang Li Baoyuan Man Weifeng Li 王福鑫;张超;杨燕美;屈媛媛;李永强;满宝元;李伟峰(School of Physics and State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China;Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan 250358,China;College of Chemistry,Chemical Engineering and Materials Science,Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong,Key Laboratory of Molecular and Nano Probes(Ministry of Education),Shandong Normal University,Jinan 250014,China)

机构地区：[1]School of Physics and State Key Laboratory of Crystal Materials,Shandong University,Jinan 250100,China [2]Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan 250358,China [3]College of Chemistry,Chemical Engineering and Materials Science,Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong,Key Laboratory of Molecular and Nano Probes(Ministry of Education),Shandong Normal University,Jinan 250014,China

出　　处：《Chinese Physics Letters》2020年第11期48-54,共7页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant No.11874238);the Basic Research Project of Natural Science Foundation of Shandong Province(Grant No.ZR2018MA034);Collaborative Innovation Funds of Shandong Normal University。

摘　　要：Through atomic molecular dynamics simulations,we investigate the performance of two graphenic materials,boron(BC3)and nitrogen doped graphene(C3 N),for seawater desalination and salt rejection,and take pristine graphene as a control.Effects of inter-layer separation have been explored.When water is filtered along the transverse directions of three-layered nanomaterials,the optimal inter-layer separation is 0.7–0.9 nm,which results in high water permeability and salt obstruction capability.The water permeability is considerably higher than porous graphene filter,and is about two orders of magnitude higher than commercial reverse osmosis(RO)membrane.By changing the inter-layer spacing,the water permeability of three graphenic layered nanomaterials follows an order of C3 N≥GRA>BC3 under the same working conditions.Amongst three nanomaterials,BC3 is more sensitive to inter-layer separation which offers a possibility to control the water desalination speed by mechanically changing the membrane thickness.This is caused by the intrinsic charge transfer inside BC3 that results in periodic distributed water clusters around the layer surface.Our present results reveal the high potentiality of multi-layered graphenic materials for controlled water desalination.It is hopeful that the present work can guide design and fabrication of highly efficient and tunable desalination architectures.

关 键 词：SEPARATION LAYER filtered 

分 类 号：TB383.1[一般工业技术—材料科学与工程]