PHOTOCATALYTIC ACTIVITY OFAg,Au-DEPOSITEDTiO2NANOPARTICLES PREPARED BY SONOCHEMICAL REDUCTION METHOD

Daniel Yang and Sang-Wha Lee ()
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Daniel Yang: Department of Chemical and Bioengineering, Kyungwon University, San 64 Bokjeomg-dong, Soojung-gu, Seongnam, Gyeonggi-do, South Korea
Sang-Wha Lee: Department of Chemical and Bioengineering, Kyungwon University, San 64 Bokjeomg-dong, Soojung-gu, Seongnam, Gyeonggi-do, South Korea

Surface Review and Letters (SRL), 2010, vol. 17, issue 01, 21-26

Abstract: The photocatalytic activity of metal-depositedTiO2was investigated with different surface coverage of nanosized noble metals (AgandAu). The sonochemical deposition of nanosized metals on theTiO2matrix was prepared by adjusting the loading volumes of silver and gold precursors in an ultrasound-driven cell. Non-annealedAg-TiO2exhibited the maximal activity in the optimal loading ranges of silver precursor (e.g. 0.2–0.3 ml of 1.0 wt.%AgNO3), displaying the enhanced efficiency of electron–hole separation. The addition of nanosizedAuonAg-TiO2proved to be undesirable to improve the photocatalytic activity ofAu/Ag-TiO2, except for the excessive loading of metal precursors (0.3 ml of 1.0 wt.%AgNO3+ 0.2mlof 1.0 wt.%HAuCl4). XRD and XPS analysis confirmed the co-existence ofAgandAuspecies, and the reduction of PL (photoluminescence) intensity indicated the efficient separation of electron–hole pairs for optimal doping of nanosized metals on theTiO2matrix.

Keywords: Ag/Au; sonochemical deposition; TiO2; photocatalytic (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10013588

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