Photocatalytic degradation of dye by Ag/ZnO prepared by reduction of Tollen’s reagent and the ecotoxicity of degraded products

B Thongrom, P Amornpitoksuk, S Suwanboon, Jonas Baltrusaitis

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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 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.
Original languageUndefined
Pages (from-to)587-592
JournalKorean journal of chemical engineering
Issue number4
Publication statusPublished - 2014


  • IR-93805
  • METIS-308374

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