Visible light-induced N-doped TiO_2 nanoparticles for the degradation of microcystin-LR

作     者：YANG Jing,CHEN DengXia,DENG AnPing,FANG YanFen,LUO GuangFu,LI DeJiang,LI RuiPing & HUANG YingPing Alan G.MacDiarmid Research Institute of Renewable Energy,China Three Gorges University,Yichang 443000,China 

作者机构：Alan G. MacDiarmid Research Institute of Renewable Energy China Three Gorges University Yichang China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2010年第53卷第8期

页      面：1793-1800,1833-1835页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China (20877048) the Major State Basic Research Development Program of China (2008CB417206) The Plan of Scientific and Technological Innovation Team of Outstanding Young in Universities of Hubei Province (T200703) 

主　　题：visible Light microcystin-LR N-doped titanium dioxide photocatalysis 

摘      要：N-doped nano-crystalline TiO2 powders have been synthesized by the sol-gel *** shape and crystal structure of the resulting N-doped TiO2 were investigated by X-ray Photoelectron Spectroscopy (XPS),X-ray spectroscopy (XRD),Transmission Electron Microscopy (TEM) and UV-vis reflection *** results showed that doping TiO2 with nitrogen can lower its band gap and apparently shift its optical response to the visible *** the visible light (λ 420 nm) irradiation,the MC-LR was degraded by the synthesized N-TiO2 *** variation of MC-LR amount and its intermediates were detected by high performance liquid chromatography (HPLC) and LC-MS,*** mineralization of MC-LR was determined by total organic carbon (TOC) ***,transient oxidative species generated during photocatalysis were tracked by electron spin resonance (ESR) and Peroxidase *** these results indicated that visible-light excited N-TiO2 can activate molecular oxygen and thereby achieve degradation of MC-LR completely within 14 *** removal of 59% of TOC was achieved after 20 h *** major oxidative species in the system were hydroxyl radical (·OH) and H2O2.13 Kinds of intermediates were primarily identified in the *** on these results,a reasonable conclusion was drawn for the degradation of MC-LR wherein its four positions are easy to be attacked by the photo-generated OH radical followed by the hydrolyzation of peptides.