Rationally designed Ti_(3)C_(2) MXene/CaIn_(2)S_(4) Schottky heterojunction for enhanced photocatalytic Cr(VI) reduction:Performance,influence factors and mechanism  

作　　者：Chao Liu Wen Xiao Xingyu Liu Qiang Wang Jiawei Hu Siyuan Zhang Jianguang Xu Qinfang Zhang Zhigang Zou 

机构地区：[1]School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China [2]School of Energy and Materials,Shanghai Polytechnic University,Shanghai 201209,China [3]Eco-Materials and Renewable Energy Research Centre(ERERC),Nanjing University,Nanjing 210093,China

出　　处：《Journal of Materials Science & Technology》2023年第30期123-135,共13页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51902282 and 12274361);the Qinglan Project of Jiangsu of China,the Natural Science Founda-tion of Jiangsu Province(No.BK20211361);the College Natural Science Research Project of Jiangsu Province(No.20KJA430004).

摘　　要：As a highly toxic heavy metal,Cr(VI)reduction by developing high-efficiency photocatalysts is of great significance.Herein,we firstly design few-layer Ti_(3)C_(2) MXene(FTM)by the hand-operated shaking,show-ing dual advantages of structural stability and more exposed reactive sites.Then,a refluxed process is performed to fabricate FTM/CaIn_(2)S_(4)(FTC) composites,where 2D CaIn_(2)S_(4)(CIS) nanoplates are closely con-nected with 2D FTM to form Schottky junction.The optimal 1-FTC with the FTM/CIS mass ratio of 1 wt.%exhibits the highest activity toward photocatalytic Cr(VI)reduction under visible light.It is well eluci-dated that the broadened light absorption range and promoted charge carrier separation rate induced by the introduction of FTM are responsible for improving photocatalytic activity of CIS.During Cr(VI)photoreduction,1-FTC possesses excellent photo-stability and reusability.The effects of catalyst mass,co-existing ions,water sources and pH values on the Cr(VI)photoreduction efficiency are investigated.Pho-togenerated•O_(2)^(−)and e−are the main radical species accounting for Cr(VI)photoreduction over 1-FTC.The photocatalytic mechanism along with Cr(VI)removal pathway is exploited.This work may provide some insights into constructing FTM-based Schottky junctions for the efficient water purification.

关 键 词：CaIn_(2)S_(4) Ti_(3)C_(2)MXene Cr(VI)reduction Visible light Photocatalysis 

分 类 号：TB3[一般工业技术—材料科学与工程]