Title: Kinetics of the TiO2-catalysed photodegradation of reactofix navy blue 2GFN dye
Authors: Sudhanshu Sharma, S.P. Bansal, K.S. Gupta
Addresses: Atmospheric Chemistry Lab, Department of Chemistry, University of Rajasthan, Jaipur 302 004, Rajasthan, India. ' Atmospheric Chemistry Lab, Department of Chemistry, University of Rajasthan, Jaipur 302 004, Rajasthan, India. ' Atmospheric Chemistry Lab, Department of Chemistry, University of Rajasthan, Jaipur 302 004, Rajasthan, India
Abstract: UV-irradiated TiO2-catalysed as well as uncatalysed photodegradation of the dye, reactofix navy blue 2GFN, has been studied under various reaction conditions. The kinetics have been followed at 603 nm, the λmax of the dye, in the visible region. The rate of the reaction depends on [dye] and [O2], and on [TiO2] when its concentration is below 0.2 g L-1. On increasing [TiO2] beyond 0.2 g L-1, the rate attains a limiting value. On increasing pH, the rate decreases slightly. At 7.0 pH and 0.2 g L-1 TiO2, the photodegradation kinetics is in conformity with the following experimental rate law.
Robs=k2[dye]+k3[dye][O2] + |
k8K1K2[dye][O2] ————————————— (1+K2[dye])(1+K1[O2]) |
Keywords: photodegradation; photocatalysis; TiO2; decolourisation; textile dyes; kinetics; titanium dioxide; wastewater treatment; reactofix navy blue 2GFN dye.
International Journal of Environment and Pollution, 2006 Vol.27 No.1/2/3, pp.147 - 157
Published online: 25 Jul 2006 *
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