Journal
ULTRASONICS SONOCHEMISTRY
Volume 16, Issue 3, Pages 316-320Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2008.10.010
Keywords
Au-TiO2 nanoparticles; Sonophotocatalysis; Teric GN9 surfactant
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Funding
- Department of Science and Technology (DST), New Delhi [INT/AUS/P-1/07]
- Department of Innovation, Industry, Science and Research (DIISR), Australia
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Au-TiO2 photocatalysts were sonochemically prepared by three different procedures and their photocatalytic and sonophotocatalytic efficiencies were evaluated by studying the degradation of a representative organic pollutant, nonylphenol ethoxylate (NPE) surfactant in aqueous solutions. In the first procedure, Au-TiO2 nanoparticles were prepared by depositing sonochemically synthesized gold nanoparticles on Degussa P25 TiO2 by stirring in the absence of an ultrasonic field. In the second procedure, Au nanoparticles were sonochemically synthesized and simultaneously deposited on Degussa P25 TiO2 particles. In the third procedure, Au-TiO2 nanoparticles were sonochemically synthesized by the simultaneous irradiation of an aqueous solution containing AuCl4- and titanium tetra isopropoxide. The prepared nanoparticles were characterized by UV-vis spectroscopy and transmission electron microscopy (TEM). The catalytic activities of these nanomaterials were compared for the degradation of a polydisperse nonylphenol ethoxylate. Teric GN9 by photocatalysis and sonophotocatalysis under visible light/high frequency ultrasound irradiation. The catalysts did not show a synergetic effect towards the sonophotocatalytic degradation of Teric GN9. This might be due to the interference of the degradation products generated during the simultaneous irradiation by light and ultrasound. (c) 2008 Elsevier B.V. All rights reserved.
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