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催化学报 2010
氧化铈纳米粒子光催化降解亚甲基蓝的动力学和机理DOI: 10.1016/S1872-2067(10)60121-0, PP. 1328-1334 Keywords: ceria,nanoparticle,photodegradation,methyleneblue,photocatalyst,kinetics Abstract: ？CeO2nanocrystalsweresynthesizedbyasimpleprecipitationmethodandcalcinationat600°C.(NH4)2Ce(NO3)6andammoniawereusedasprecursors.TheCeO2nanoparticleswerecharacterizedbyX-raydiffraction,Fouriertransforminfraredspectroscopy,transmissionelectronmicroscopy,andN2adsorption.ThephotodegradationofmethylenebluecatalyzedbyCeO2nanoparticleswasstudiedunderUVandsunlightirradiation.Thehighestdegradationwasobtainedwith1.0g/LCeO2atpH11within125min.Thepseudofirstorderrateconstantsofdyebleachingwerecalculatedas16.2x10-3and15.7x10-3min-1underUVandsunlightirradiation,respectively.Theeffectofiso-PrOH,iodideion,andH2O2wasstudiedtopredictthepathwayofdyedegradation.Theobtainedresultsindicatetheeffectofphotogeneratedholesinthedegradationmechanismofthedye.Also,thephotocatalyticactivityofthepreparedphotocatalystwasstudiedinthepresenceofseveralnegativeions.
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