Role of adsorption in the photodegradation of a dye, acid-blue 92 Online publication date: Mon, 24-Jul-2006
by Moon-Sun Kim, Jong-Min Lee, Byungho Hwang, Wookeun Bae, Byung-Woo Kim
International Journal of Environment and Pollution (IJEP), Vol. 27, No. 1/2/3, 2006
Abstract: The effect of adsorption onto the TiO2 particle surface, on the photodegradation rate of a dye acid-blue 92, was investigated. Overall adsorption rate was estimated by using a differential bed reactor with TiO2 particles and without UV radiation, while photodegradation rate was determined in a TiO2 immobilised photoreactor with UV radiation. Overall adsorption rate of the dye acid-blue 92 was higher in a strong acidic region at pH 3 than in a weak acidic region at pH 6 and was the lowest at pH 7 and 8. The photodegradation rate of the dye acid-blue 92 with respect to initial concentration could be described as an apparent first order kinetics, where the rate constants (K) were estimated as 0.012, 0.010, and 0.008 min-1 at pH 3, 5, and 7, respectively. The change of pH affected both photodegradation and adsorption rates of the dye acid-blue 92 and the close relationship between overall adsorption and photodegradation rates could be observed dependently on the pH variation.
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