Abstrato

INFLUENCE OF OPERATIONAL PARAMETERS ON DEGRADATION OF COMMERCIAL TEXTILE AZO DYE ACID BLUE 113 (CYANINE 5R) BY ADVANCED OXIDATION TECHNOLOGY

Photocatalytic degradation, Heterogenous, Acid blue 113, TiO2, Transition metal ions

In this research work, the effect of various parameters on the photocatalytic degradation of commercially available azo dye Acid blue 113 (AB 113) in aqueous heterogeneous suspension has been studied. Parameters such as pH, amount of photocatalyst, dye concentration and nature of photocatalyst as main operational parameters selected and their influence on degradation efficiency have been investigated. The progress of reaction was observed spectrophotometrically. The Kinetic analysis of photocatalytic degradation reveals that the degradation follows pseudo first order kinetics according to the Langmuir- Hinshelwood model. The effect of addition of transition metal ions (Fe2+, Cu2+, Mn2+, Zn2+) on photocatalytic degradation efficiency of TiO2 have been investigated. It was observed that trace quantities of all the added metal ions increase 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 also been proposed.