title: Nonlinear regression analysis of kinetics of the photocatalytic decolorization of an azo dye in aqueous TiO2 slurry.
abstract: The kinetics of decolorization of an anionic monoazo dye of acid class named C.I. Acid Red 27 (AR27) was investigated in the UV/TiO2 process with nonlinear regression analysis. The experimental results indicated that the kinetics of decolorization of AR27 in this process fit well by pseudo-first order kinetics. With nonlinear regression analysis a model was developed for pseudo-first order rate constant (k(ap,UV/TiO2)) as a function of operational parameters such as TiO2 dosage, initial concentration of AR27, concentration of O2 and UV-light intensity (I0) as following: k(ap,UV/TiO2) = 0.0025 [TiO2](0.65) [AR27]0(-0.96) [O2](0.16)I0. This rate expression can be used for predicting k(ap,UV/TiO2) at different conditions.
authors.affiliation: Research Laboratory, Department of Applied Chemistry, Islamic Azad University, Tabriz Branch, P.O. Box 1655, Tabriz, I.R. Iran. behnajady@iaut.ac.ir
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Behnajady
authors.forename: Nasser
authors.initials: N
authors.lastname: Modirshahla