Solar Light-Induced Decolorization of Safranin O Using Unmodified and Gold-Modified Semiconductor Oxides

author

  • Zsigmond Papp Faculty of Biofarming, Megatrend University, Maršala Tita 39, 24300 Bačka Topola, SERBIA
Abstract:

Unmodified and gold-modified semiconductor oxides were used for the complete decolorization of non-buffered aqueous safranin O solutions. Photocatalytic properties of commercially available ZnO and TiO2 (anatase nanopowder) were compared with those of gold-modified ZnO (Au/ZnO). Au/ZnO was obtained from commercial ZnO powder through direct current sputter coating. ZnO-based catalysts show significantly higher decolorization power in comparison with TiO2. Au/ZnO show slightly higher activity than unmodified ZnO. Decolorization of safranin O using Au/ZnO was additionally tested in different types of mineral water. The decolorization efficiency in mineral waters was negatively correlated with the dry residue content (180 °C) and in all cases was less than in distilled water. The inhibiting effect of hydrogen carbonate was additionally investigated.

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Journal title

volume 37  issue 2

pages  151- 156

publication date 2018-04-01

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