Comparative study of metal oxides and phosphate modification with different mechanisms over g-C_(3)N_(4) for visible-light photocatalytic degradation of metribuzin  

作　　者：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 

机构地区：[1]Key Laboratory of Functional Inorganic Materials Chemistry,School of Chemistry and Material Sciences,Heilongjiang University,Harbin 150080,China [2]Key Laboratory of Photochemical Biomaterials and Energy Storage Materials,College of Chemistry and Chemical Engineering,Harbin Normal University [3]A.Zada Department of Chemistry,Abdul Wali Khan University Mardan,Mardan 23200,Pakistan

出　　处：《Rare Metals》2022年第1期155-165,共11页稀有金属（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.21971057 and U1805255);the Natural Science Foundation of Heilongjiang Province(Nos.YQ2019B006 and LH2020B012);the Postdoctoral Research Foundation of Heilongjiang Province(No.LBH-Q19052);the Outstanding Youth Fund of Heilongjiang University(No.JCL201901);the Basic Scientific Research Expenses of Colleges and Universities in Heilongjiang Province(No.2020-KYYWF-1008).

摘　　要：In this work,a comparative study of three frequently employed modification techniques to g-C_(3)N_(4)(CN)nanosheets for the photocatalytic degradation of metribuzin(MET)under visible-light irradiation has been carried out in detail.The modification methods were coupling TiO_(2)nanoparticles(TO)as electron acceptors,nano-sized Fe_(2)O_(3)(FO)to construct a Z-scheme nanocomposite,and phosphate(HP)modification to promote O_(2)adsorption.The steady-state and transient-state surface photovoltage spectra and transient photoluminescence(PL)spectra confirmed that all the three modification techniques enhanced the charge separation with prolonged lifetimes and presented 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 experiments indicated that the increased activity was related to the synergetic effect of two radicals(·O^(2-) 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 photocatalysts.

关 键 词：g-C_(3)N_(4) TiO_(2)modification Fe_(2)O_(3)coupling Visible-light photocatalysis Charge separation METRIBUZIN 

分 类 号：X592[环境科学与工程—环境工程] O644.1[理学—物理化学] O643.36[理学—化学]