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Nonlinear regression analysis of kinetics of the photocatalytic decolorization of an azo dye in aqueous TiO2 slurry

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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 (\( <EquationSource Format="MATHML"> <math xmlns:xlink="http://www.w3.org/1999/xlink"> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <msub> <mtext>ap,UV/TiO</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mrow> </msub> </math> </EquationSource> \)) as a function of operational parameters such as TiO2 dosage, initial concentration of AR27, concentration of O2 and UV-light intensity (I0) as following: \( <EquationSource Format="MATHML"> <math xmlns:xlink="http://www.w3.org/1999/xlink"> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <msub> <mtext>ap,UV/TiO</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mrow> </msub> </math> </EquationSource> \) = 0.0025 [TiO2]0.65 [AR27] −0.960 [O2]0.16I0. This rate expression can be used for predicting \( <EquationSource Format="MATHML"> <math xmlns:xlink="http://www.w3.org/1999/xlink"> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <msub> <mtext>ap,UV/TiO</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> </mrow> </msub> </math> </EquationSource> \) at different conditions.

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Authors and Affiliations

  1. Research Laboratory, Department of Applied Chemistry, Islamic Azad University, Tabriz Branch, P.O. Box 1655, Tabriz, I.R., Iran

    Mohammad A. Behnajady & Nasser Modirshahla

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  1. Mohammad A. Behnajady
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  2. Nasser Modirshahla
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Correspondence to Mohammad A. Behnajady.

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Behnajady, M.A., Modirshahla, N. Nonlinear regression analysis of kinetics of the photocatalytic decolorization of an azo dye in aqueous TiO2 slurry. Photochem Photobiol Sci 5, 1078–1081 (2006). https://doi.org/10.1039/b610574b

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  • DOI: https://doi.org/10.1039/b610574b

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