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Received June 27, 2013
Accepted December 1, 2013
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Photocatalytic degradation of dye by Ag/ZnO prepared by reduction of Tollen’s reagent and the ecotoxicity of degraded products
1Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand 2Center of Excellence in Nanotechnology for Energy (CENE), Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand 3Department of Materials Science and Technology, Faculty of Science, Prince of Songkla Univeristy, Hat-Yai, Songkhla 90112, Thailand 4PhotoCatalytic Synthesis Group, University of Twente, Meander 229, P. O. Box 217 7500 AE Enschede, The Netherlands
Korean Journal of Chemical Engineering, April 2014, 31(4), 587-592(6), 10.1007/s11814-013-0262-x
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Abstract
A heterostructure of Ag/ZnO powder was prepared by a reduction of Ag(NH3)2+ ions in a basic solution or Tollen’s reagent. From this method, the existence of a metallic Ag coating on the ZnO surface was confirmed by transmission electron microscope and x-ray photoelectron spectroscopy. The photocatalytic activity of the Ag/ZnO powders was investigated by analyzing the degradation of an aqueous methylene blue solution under a blacklight irradiation. Furthermore, the parameters, including Ag content, catalyst loading, initial dye concentration and pH, were_x000D_
also studied. After the methylene blue solution was irradiated for 30min under a blacklight illumination, total mineralization was not observed as the presence of some carbon compound species was indicated in a mass spectrum. Furthermore, the toxicity of the treated methylene blue solution produced by the Ag/ZnO powders was also investigated by a test for the inhibition of the growth of Chlorella vulgaris.
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