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ID:32329975
大小:17.09 MB
页数:70页
时间:2019-02-03
《cu(ⅱ)、fe(ⅲ)和ⅰ2参与的光化学反应及其机理的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Abstractkinetics.ControlexperimentswiththemetalionsshowedthatonlyFd+inaqueoussolutionunderwentsignificantphotolysisanddarkadsorptionontothecatalysts.Throughabneticanalysis.itbecomesclearthataselectronscavengersofTi02andW03,bothFe3+andCu2+arebetterthan02,whileF
2、e3+isbetterthanCu2+,theobservationinagreementwiththoseexpectedinthermodynamics.Moreover,Fe2+ionsformedfromFe3+redu“onoverTi02carlbere,oxidizedtoFe3+bythephotogeneratedreactivespeciessuch觞H202,whileCuparticles,producedfromCu+reductionoverruffle,anataseandW03,ca
3、nbereoxidizedtoCu2+by02dissolvedinaqueoussolutions.Secondpart,westudiedonthephotoactivityforFd+photo.oxidizationwithhand13一.UnderUVandvisiblelightatwavelengthslongerthan320and420sin,respectively,bothhand13一inacidicaqueoussolutioncanoxideFe2+,withthestoichiomet
4、ricformationofFej+andI。.Comparatively,the12一sensitizedreactionwasfast,whilethe13一-sensitizedreactionsignificantlyoccurredonlyinthepresenceofexcessFd+.Thisisas嘶bedtothefactthatI‘radicalsgeneratedintheformerarcmorereactivethan12“radicalsproducedinthelatter.Thequ
5、antumyieldsforthehandIf-sensitizedformationofFd+,measuredat456脚were0.119andO.118,respectively.Moreov%under12andvisiblelight,theinitialrateofFe3+productionincreasedwiththeinitialconcentrationofhandwiththereactiontemperatureaswell,butitWasindependentofFe2+concen
6、tration.ThereactionWasdeterminedtothefirstorderto12,andArrheniusactivationWas29.3kJ’mol~.TheseobservationssuggestthatthereactionbetweenFe2+andI‘isfast,whiletheformationandself-recombinationofrradicalsaletheratedeterminingstepforthe12一sensitizedreaction.Keyword
7、s:Photocatalyst,Photosesitize,Mechanism,TungstateTrioxide,TitaniumDioxide,Ferricions,Copperions,iodineIV目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯..Ⅲ第一章前言⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11.1光催化概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
8、⋯⋯⋯⋯⋯..11.1.1半导体光催化原理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯.11.1.2常见的半导体光催化剂⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31.1.3影响光催化反应的因素⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯41.2Ti02光催化概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯~71.2.1Ti02的结构特征⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯
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