Heterogeneous photocatalytic treatment of textile dye effluent containing Azo Dye: Direct Crysophenine G

Photocatalytic bleaching of hydrolyzed textile azo dye Direct Crysophenine G using titanium dioxide (TiO2) was analyzed in our study. The effect of various operating parameters like pH, concentration of the dye, amount of photocatalyst and nature of photocatalyst on the efficiency of the reaction has been studied. The progress of reaction was observed spectrophotometrically.The. Kinetic analysis of photocatalytic bleaching reveals that the degradation follows approximately pseudo first order kinetics according to the Longmuir- Hinshelwood model. The optimum conditions for the photocatalytic bleaching had been established. The effect of addition of transition metal ions (Fe2+, Cu2+, Mn2+, Zn2+, Ag+) on photo bleaching efficiency of TiO2 have been investigated. It was observed that trace quantities of all the added metal ions increases the reaction rate to some extent. The increase in the photocatalytic activity may be due to introduction of new trapping sites by incorporation of transition metal ions on semiconductor surface. A tentative mechanism has been proposed

Author(s): Preeti Mehta#, aMenka Surana, bRajeev Mehta and cB.V. Kabra

Abstract | PDF

Share This Article