cu(ⅱ)、fe(ⅲ)和ⅰ2参与的光化学反应及其机理的研究

《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⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯