改性纳米二氧化钛光催化剂的制备及其光催化性能分析-preparation of modified nano-titanium dioxide photocatalyst and analysis of its photocatalytic performance.docx

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2018-06-04 发布于上海
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改性纳米二氧化钛光催化剂的制备及其光催化性能分析-preparation of modified nano-titanium dioxide photocatalyst and analysis of its photocatalytic performance.docx

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改性纳米二氧化钛光催化剂的制备及其光催化性能分析-preparation of modified nano-titanium dioxide photocatalyst and analysis of its photocatalytic performance

malachitegreen,Li+-dopingbothbysol-gelrouteandbyimpregnationmethodcanallenhancethecatalyticactivityofTiO2effectively,butthecatalystspreparedbytheimpregnationmethodaremoreefficientthanthosepreparedbysol-gelroute,andthebestphotoactivityisobtainedfor5%Li+-dopedTiO2preparedbyimpregnationtechnologyanditsphotocatalyticefficiencyis7~8timeshigherthanthatofpureTiO2;Formethylorangedegradation,Li+-dopingreducesthecatalyticactivityofTiO2tosomeextent,exceptfor3%Li+-dopedTiO2thatisslightlybetterpreparedbysol-gelroute.ThemainreasonsofreversephotocatalyticactivityofLi+-dopedTiO2indegradingdifferentorganicpollutantsisthatLi+-dopingchangespHpzcandthestateofthechargeofTiO2surface.Andthen,S-dopedTiO2visible-lightactivatedphotocatalystswerepreparedusingtitaniumisopropoxideandthioureaasstartingrawmaterials.ThephotocatalystswerecharacterizedbyXRD,XPS,TEMandUV-Visabsorptionspectra.ThephotocatalyticdegradationofmethylorangeinaqueoussolutionwasusedasaprobereactiontoevaluatethephocatalyticactivityofthephotocatalystsusingUVlightandsunlightaslightsources.TheresultsshowthatS-dopedTiO2calcinedat500℃and600℃absorbsvisiblelightandultravioletlightmorestronglythanpureTiO2,andphotocatalyticactivityofthemishigherthanthatofpureTiO2undervisibleandultravioletlight.ThephotocatalyticactivityofS-dopedTiO2calcinedatabout500℃isthehighestinS-dopedTiO2andpureTiO2.ComparedwithpureTiO2,thephotocatalyticdegradutionrateofmethylorangewithS-dopedTiO2calcinedat500℃underultravioletlightandsolarlightisenhancedabout32%and69%after40~50minreaction,respectively.TEMresultsconfirmthattheaveragediameterofS-dopedphotocatalystscalcinedat500℃isabout15~16nm.XRDresultsshowthatS-dopingcanpromotethephasetransformationofTiO2fromanatasetorutile,reducethecrystallitesizeofphotocatyalysts.XPSresultsindicatethattheoxidationstateoftheSatomsubstitutedforsomeofthelatticetitaniumatomsinS-dopedTiO2ismainlyS6+.Inthispaper,threedifferentmodifiednanosizedtitaniumdioxideswereprepared,thephotocatalyticactivitiesofTiO2arealllargelyimproved,sowemakeinst