In this work,a comparative study of three fre-quently employed modification techniques to g-C3N4 (CN)nanosheets for the photocatalytic degradation of metribuzin(MET) under visible-light irradiation has been carried out in detail.The modification methods were coupling TiO2 nanoparticles (TO) as electron acceptors,nano-sized Fe2O3(FO) to construct a Z-scheme nanocomposite,and phos-phate (HP) modification to promote O2 adsorption.The steady-state and transient-state surface photovoltage spec-tra and transient photoluminescence (PL) spectra con-firmed that all the three modification techniques enhanced the charge separation with prolonged lifetimes and pre-sented degradation activities in the order of TO/CN ＞ FO/CN ＞ HP/CN.The TO/CN nanocomposite showed the highest photocatalytic activity for MET degradation,with a sixfold higher rate than bulk CN.Liquid chromatography-tandem mass spectrometry and radical trapping experi-ments indicated that the increased activity was related to the synergetic effect of two radicals (·O2-and ·OH)involved in the photocatalytic degradation pathway,which was different from the ·OH radical-dominated pathway of bulk CN.This work reveals the importance of charge separation and the influence of the radical pathway and provides guidance for the design of high-efficiency pho-tocatalysts.

Rui Yan;Amir Zada;Lei Sun;Zhi-Jun Li;Zhi-Yuan Mu;Shuang-Ying Chen;Fan Yang;Jian-Hui Sun;Lin-Lu Bai;Yang Qu;Li-Qiang Jing

Key Laboratory of Functional Inorganic Materials Chemistry,School of Chemistry and Material Sciences,Heilongjiang University,Harbin 150080,China;Key Laboratory of Photochemical Biomaterials and Energy Storage Materials,College of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,China;Department of Chemistry,Abdul Wali Khan University Mardan,Mardan 23200,Pakistan

稀有金属（英文版）

[1]Rui Yan;Amir Zada;Lei Sun;Zhi-Jun Li;Zhi-Yuan Mu;Shuang-Ying Chen;Fan Yang;Jian-Hui Sun;Lin-Lu Bai;Yang Qu;Li-Qiang Jing-.Comparative study of metal oxides and phosphate modification with different mechanisms over g-C3N4 for visible-light photocatalytic degradation of metribuzin)[J].稀有金属（英文版）,2022(01):155-165

metribuzin,tocatalysts

Comparative,study,metal,oxides,phosphate,modification,different,mechanisms,over,C3N4,visible,light,photocatalytic,degradation,In,this,work,comparative,three,fre,quently,employed,techniques,CN,nanosheets,MET,under,irradiation,has,been,carried,out,detail,methods,were,coupling,TiO2,nanoparticles,TO,electron,acceptors,sized,Fe2O3,FO,construct,scheme,nanocomposite,HP,promote,adsorption,steady,state,transient,surface,photovoltage,photoluminescence,PL,spectra,firmed,that,all,enhanced,charge,separation,prolonged,lifetimes,pre,sented,activities,order,showed,highest,activity,sixfold,higher,rate,than,bulk,Liquid,chromatography,tandem,mass,spectrometry,trapping,experi,ments,indicated,increased,was,related,synergetic,effect,two,radicals,involved,pathway,which,from,dominated,This,reveals,importance,influence,provides,guidance,design,efficiency

0.560148