000170954 001__ 170954
000170954 005__ 20181203022523.0
000170954 0247_ $$2doi$$a10.1016/j.apcatb.2011.07.007
000170954 02470 $$2ISI$$a000294883300018
000170954 037__ $$aARTICLE
000170954 245__ $$aInfluence of gold particle size on the photocatalytic activity for acetone oxidation of Au/TiO2 catalysts prepared by dc-magnetron sputtering
000170954 269__ $$a2011
000170954 260__ $$c2011
000170954 336__ $$aJournal Articles
000170954 520__ $$aTwo series of Au/TiO2 materials with different gold content have been prepared by dc-magnetron sputtering on ceramic shaped pure anatase or Degussa P25 TiO2. The time of deposition was varied between 1 and 20 min in order to obtain different thickness and nanoparticle size of the gold films. For comparison samples with Au loadings in the range 0.3-0.9 wt% were prepared using the deposition-precipitation methodology. The obtained materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). DR-UV-Vis and atomic force and scanning electron microscopy techniques. The photocatalytic activity was checked in the photo-oxidation of acetone under both UV and visible irradiation conditions. Several factors were found to influence the photoactivity. An optimal Au content corresponding to a maximum activity is observed and attributed to the occurrence of adequate titania surface coverage and Au particle size. The support plays an important role and it was found that pristine anatase on which gold (average particle size 7.7 nm) was deposed by dc-reactive sputtering exhibits the maximum of the activity. Samples prepared by dc-sputtering were more active than samples prepared by deposition-precipitation method. Also, the photocatalysts prepared using dc-reactive sputtering showed activity under both UV and visible light irradiation, while those prepared using the deposition-precipitation technique are active only under UV light. The most likely mechanism of gold activation of titania is that upon light absorption, gold nanoparticles inject electrons into the titania conduction band. (C) 2011 Elsevier B.V. All rights reserved.
000170954 6531_ $$aTitania
000170954 6531_ $$aPhotocatalysis
000170954 6531_ $$adc-magnetron gold sputtering
000170954 6531_ $$aVisible-Light
000170954 6531_ $$aSemiconductor Photocatalysis
000170954 6531_ $$aLoaded Tio2
000170954 6531_ $$aNanoparticles
000170954 6531_ $$aDegradation
000170954 6531_ $$aTitania
000170954 6531_ $$aDeposition
000170954 6531_ $$aDecomposition
000170954 6531_ $$aExcitation
000170954 6531_ $$aSurfaces
000170954 700__ $$aCojocaru, Bogdan$$uUniv Bucharest, Fac Chem, Dept Chem Technol & Catalysis, Bucharest 030016, Romania
000170954 700__ $$aNeatu, Stefan$$uUniv Bucharest, Fac Chem, Dept Chem Technol & Catalysis, Bucharest 030016, Romania
000170954 700__ $$aSacaliuc-Parvulescu, Elena$$uUniv Bucharest, Fac Chem, Dept Chem Technol & Catalysis, Bucharest 030016, Romania
000170954 700__ $$aLevy, Francis$$uEcole Polytech Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland
000170954 700__ $$aParvulescu, Vasile I.$$uUniv Bucharest, Fac Chem, Dept Chem Technol & Catalysis, Bucharest 030016, Romania
000170954 700__ $$aGarcia, Hermenegildo$$uUniv Politecn Valencia, Valencia 46022, Spain
000170954 773__ $$j107$$q140-149$$tApplied Catalysis B-Environmental
000170954 909C0 $$0252369$$pSB$$xU10077
000170954 909CO $$ooai:infoscience.tind.io:170954$$pSB$$particle
000170954 937__ $$aEPFL-ARTICLE-170954
000170954 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000170954 980__ $$aARTICLE