高等学校化学学报2018，Vol.39Issue(7)：1503-1510,8.DOI:10.7503/cjcu20170814
能级可调的钾离子掺杂石墨相氮化碳的可控制备及"双渠道"光催化合成过氧化氢性能
Synthesis and "Two Channel Pathway" Photocatalytic H2O2 Production Ability of Band Gap Tunable K+ Doped Graphitic Carbon Nitride
摘要
Abstract
Band gap tunable K+ doped graphitic carbon nitride was synthesized.Photocatalytic H2O2 production ability of as-prepared catalyst was investigated.X-ray diffraction(XRD),N2adsorption analysis,scanning electron microscopy(SEM),UV-Vis,photoluminescence(PL)and X-ray photoelectron spectrosco-pies(XPS)and electrochemical impedance spectrometry(EIS)were used to characterize the obtained cata-lysts.The results indicate that K+ doping not only promotes the specific surface area(SBET),visible light absorption and separation rate of electron-hole pairs,but tunes the CB and VB positions of as-prepared cata-lysts by controlling the K+doping amount.Such tunable band potential results in the photocatalytic H2O2pro-duction from " single channel pathway" to " two channel pathway".One pathway is that photoelectrons reduce oxygen to generate hydrogen peroxide,the other is that VB holes oxidize OH- to form ·OH,which subse-quently react with each other to form hydrogen pero-xide.Such " two channel pathway" leads to the promoted H2O2 production ability.This work provides a new idea of catalyst preparation for photocatalytic hydrogen per-oxide production.关键词
氮化碳/钾离子掺杂/能级调控/光催化/过氧化氢合成Key words
g-C3N4/K+ doping/Band gap tuning/Photocatalysis/H2O2 production分类
化学化工引用本文复制引用
王辉,裴彦博,胡绍争,马文涛,石朔宇..能级可调的钾离子掺杂石墨相氮化碳的可控制备及"双渠道"光催化合成过氧化氢性能[J].高等学校化学学报,2018,39(7):1503-1510,8.基金项目
国家自然科学基金(批准号:41571464)和辽宁省教育厅一般项目(批准号:L2014145)资助.Supported by the National Natural Science Foundation of China(No.41571464)and the Education Department of Laoning Province,China(No.L2014145). （批准号:41571464）
