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催化学报  2013 

金纳米粒子在TiO2气凝胶基质上的行为:光催化活性评价和结构研究

DOI: 10.1016/S1872-2067(11)60500-7, PP. 734-740

Keywords: Nanomaterial,Sol-gel,Titania,Salicylicacid,Photocatalyticperformance

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Abstract:

?TiO2-Auaerogelscontainingdifferentamountsofgoldnanoparticlesofdifferentsizes(5and16nm)weresuccessfullysynthesizedusingasol-gelprocedure,andweretestedforsalicylicacidphotodegradationunderUVirradiation.ThestructureandmorphologyoftheobtainedmaterialswereinvestigatedusingX-raydiffraction,transmissionelectronmicroscopy,andN2adsorption-desorptionmeasurements.UV-Visspectroscopywasusedtostudytheopticalproperties.TheeffectsofthegoldnanoparticlesontheTiO2crystallizationprocessweretwofold,asfollows:(i)thenumberofcrystallizedzoneswasstronglyrelatedtotheconcentrationofthegoldnanoparticles,and(ii)thesmallergoldparticlesincreasedthetimetakenforthecrystallizationofthesamples.Itwasfoundthatthenoblemetal-dopedsamplesexhibitedhigherdegradationratescomparedwithbaretitania.Itwasfoundthatthemostactivephotocatalystineachstudiedsystemwasthesamplewiththehighestconcentrationofgoldnanoparticles.Additionally,thehighestdegradationratevaluewasobtainedwiththesmallestAunanoparticles(46.4×10-3μmol/(L·s).

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