Journal of Advanced Chemical Sciences (JACS)

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Article – Journal of Environmental Sciences

Journal of Environmental Science and Pollution Research, Volume 2,Issue 1,2016 Pages 42-45

Photocatalytic Decoloration Efficiencies of ZnO and TiO2: A Comparative Study
N. Uma Sangari, P. Velusamy*

The photocatalytic process employing semiconductor photocatalysts are the most powerful technology for the mineralization and decoloration of organic pollutants such as dyes, phenols, etc. The photocatalytic decoloration of an azonium dye namely, Saffranin O dye by TiO2 and ZnO was investigated under UV light illumination. The effects of initial concentration of dye, pH, TiO2 and ZnO and the illumination time were experimented and the optimized conditions for maximum removal of the dye were determined and compared. The kinetic was studied with Langmuir- Hinshelwood mechanism. Among the two catalysts, TiO2 exhibited more removal efficiency than ZnO in this study.

Keywords: Photocatalysis; Saffranin O; Mineralization; Photoluminescence;