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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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DependenceofphotocatalyticactivityofZnxCd1-xSquantumdotcomposition
DOI: 10.1016/S1872-2067(14)60269-2, PP. 328-335
Keywords: Quantumdot,ZnxCd1-xS,Photocatalysis,Quantumlevel
Abstract:
？AqueouscolloidaldispersionscontainingZnxCd1-xSquantumdots(QDs)ofdifferentxcompositionswerepreparedbyprecipitatingzincandcadmiumacetateswithsodiumsulphide,inthepresenceofacetyltrimethylammoniumbromidestabilizer.Ultraviolet-visibleabsorptionspectroscopywasusedtodeterminethetransitionenergiesoftheQDs,whichinturnwereusedtocalculatetheirsizes,whichdependedontheircomposition.TheQDsizedecreasedwithincreasingZncontent.ThephotocatalyticactivityoftheZnxCd1-xSQDswasstudiedbythedecompositionofmethyleneblueunderultravioletirradiation,atamaximumintensityat365nm(3.4eV).Threedifferentphotocatalyticactivityregionswereobserved,whichdependedontheZncontent.ThequantumlevelsoftheQDscouldbeexcitedbyincidentirradiation,andinfluencedtheresultingphotocatalyticactivity.Maximumphotocatalyticactivitywasachievedatx=0.6,wheretheQDtransitionenergywasequaltotheirradiationphotonenergy.ThephotocatalyticefficiencyoftheQDsdependedontheirsurfaceareaandarrangementofquantumlevels,becauseofthequantumsizeeffect.
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