Fabrication of niobium doped titanate nanoflakes with enhanced visible-light-driven photocatalytic activity for efficient ibuprofen degradation  

作　　者：Wen Liu Wei Zhang Mushi Liu Penghui Du Chenyuan Dang Jialiang Liang Yunyi Li 

机构地区：[1]The Key Laboratory of Water and Sediment Sciences,Ministry of Education,College of Environmental Sciences and Engineering,Peking University,Chongqing 400044,China [2]Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment of Ministry of Education,Chongqing University,Beijing 100871,China [3]The Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT),Peking University,Beijing 100871,China

出　　处：《Chinese Chemical Letters》2019年第12期2177-2180,共4页中国化学快报（英文版）

基　　金：supported by the Natural Science Foundation Project of Chongqing Science and Technology Commission (CQ CSTC)(No.cstc2018jcyjAX0320);the Fundamental Research Funds for the Central Universities(No.2018CDXYCH0013);Financial supports from the National Nature Science Foundation of China(NSFC)(Nos.91647211 and No.51539001);the Innovative Research Group of NSFC(No.51721006)

摘　　要：In this study,a novel class of niobium(Nb) doped titanate nanoflakes(TNFs) are fabricated through a onestep hydrothermal method.Nb doping affects the curving of titanate nanosheet,leading to the formation of nanoflake structure.In addition,Nb5+ filled in the interlayers of [TiO6] alters the light adsorption property of pristine titanate.The band gap of Nb-TNFs is narrowed to 2.85 eV,while neat titanate nano tubes(TNTs) is 3.4 eV.The enhanced visible light adsorption significantly enhances the visible-lightdriven activity of Nb-TNFs for ibuprofen(IBP) degradation.The pseudo-first order kinetics constant for Nb-TNFs is calculated to be 1.04 h^-1,while no obvious removal is observed for TNTs.Photo-generated holes(h^+) and hydroxyl radicals(·OH) are responsible for IBP degradation.The photocatalytic activity of Nb-TNFs depends on pH condition,and the optimal pH value is found to be 5.In addition,Nb-TNFs exhibited superior photo-stability during the reuse cycles.The results demonstrated Nb-TNFs are very promising in photocatalytic water purification.In this study,a novel class of niobium（Nb） doped titanate nanoflakes（TNFs） are fabricated through a onestep hydrothermal method.Nb doping affects the curving of titanate nanosheet,leading to the formation of nanoflake structure.In addition,Nb5+ filled in the interlayers of [TiO6] alters the light adsorption property of pristine titanate.The band gap of Nb-TNFs is narrowed to 2.85 eV,while neat titanate nano tubes（TNTs） is 3.4 eV.The enhanced visible light adsorption significantly enhances the visible-lightdriven activity of Nb-TNFs for ibuprofen（IBP） degradation.The pseudo-first order kinetics constant for Nb-TNFs is calculated to be 1.04 h-1,while no obvious removal is observed for TNTs.Photo-generated holes（h+） and hydroxyl radicals（·OH） are responsible for IBP degradation.The photocatalytic activity of Nb-TNFs depends on pH condition,and the optimal pH value is found to be 5.In addition,Nb-TNFs exhibited superior photo-stability during the reuse cycles.The results demonstrated Nb-TNFs are very promising in photocatalytic water purification.

关 键 词：TITANATE NIOBIUM Photocatalysis Element doping IBUPROFEN 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]