碳化硅可见光下光催化性能的研究

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1、天津大学硕士学位论文碳化硅可见光下光催化性能的研究姓名：高艳婷申请学位级别：硕士专业：环境化工指导教师：王亚权20061201AbstractEnergyandenvironmentbecomethetwoimportanttopicsinthe21stcentury．SolarenergyisenormousandbelongstOrenewableenergy．Photocatalysisisalladvancedpotentialtechniquetoeonvertsolarenergyintochemicalenergyandha

2、smanyadvantagesinenergyconversionandenvironmentprotection．Hydrogenisanimportantchemicalandhastheadvantageofcleanandhi。ghcombustionvaluewhenitisused笛theenergycarrier．Traditionally，morethan95％hydrogenisproducedfromthereformingoffossilresourceand／orelectrolyzingwater．Photoca

3、talyticwatersplittingtoproducehydrogenhasattractedmuchattention，andisdevelopingrapidly．Inpollutionprevention，photocatalyticCrⅣI)reductionusingthereductiveabilityofthephotogeneratedelectronsisalsostudiedwidelyInthisthesis，akindofgreenSiCfinepowder,whichisusedasabrasivemate

4、rial，wascharacterizedbyXRD、UV-VisDRS、TGAandFT．IR，andstudiedforthespliaingofwaterintohydrogenundervisiblelightirradiation．TheresultsshowedthatthegreenSiCfinepowdergeneratedH2inamteof24．9此‘g-1．h‘1inpurewater；theactivitywasaffectedsignificantlybypHofthesolution,theadditionof

5、OH‘leadtoaremarkableincreaseintheactivity；additionofsacrificialreagent，S}，alsoleadtOaremarkableincreaseintheactivity．ThephotocatalyticmechanismofSiCwasdiscussed．TheactivityofSiCwithPtorNiOloadingwasalsostudied．TheresultsshowedthatthepromotioneffectofPtloadingonwaterspliam

6、gisnegligible．ThisbehaviorCallbeexplainedbythebarrierheightofthemetal—semiconductorjunction．NiOloadingcouldacceleratethehydrogengeneration，whichmaybeattributedtothechargeseparationandtheadsorptionofH+onSiCsurface．ThephotocatalyticreductionofCr(V1)onSiCundervisiblelightWas

7、alsostudied．TheactivityWassignificantlyaffectedbypHofthesolutionandtheinitialconcentrationofCr(V1)．Inaddition，thereductionofCr(VI)onSiCcouldberelatedtoitsadsorption，indicatingthattheadsorptionofCr(VI)wasacrucialstepforthephotocatalyticreductionofCr(VI)．Keywords：SiC，photoc

8、atalytic，visiblelight，hydrogen，Cr(VI)独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的研究成果，除了文中特别加以标注和致谢之处外，