Kinetics of decolorization of an azo dye in UV alone and UV/H(2)O(2) processes

Journal of Hazardous Materials
Mohammad-Ali BehnajadyH Fathi

Abstract

The decolorization of C.I. Acid Red 27 (AR27), a monoazo anionic dye, was studied in the ultraviolet radiation (UV) alone and UV plus hydrogen peroxide (UV/H(2)O(2)) processes. The experimental results indicated that the kinetics of both oxidation processes fit well by pseudo-first order kinetics. The reaction rate was sensitive to the operational parameters and increased with increasing H(2)O(2) concentration and light intensity. The reaction orders of H(2)O(2) concentration and light intensity in both processes were obtained with linear regression method. A regression model was developed for pseudo-first order rate constant (k(ap,UV/H(2)O(2))) as a function of the Cconcentration and UV light intensity. (k(ap,UV/H(2)O(2)))=(2 x 10(-4)I(0.75)(0) + k(3)I(1.38)(0)[H(2)O(2)](n)(0))phi(AR27). As a result of two opposing effects of H(2)O(2) concentration at low and high concentrations, n has a value of 0.49 and -0.39 and k(3) has a value of 3 x 10(-4) and 0.1 for the regions of 0 mg l(-1) < [H(2)O(2)](0) < 650 mg l(-1) and 650 mg l(-1) < [H(2)O(2)](0) < 1500 mg l(-1)1, respectively. PhiAR27 is the initial dye concentration correlation index for developing of model for different initial concentrations of AR27. This rate expression ca...Continue Reading

Citations

Nov 2, 2006·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Mohammad A Behnajady, Nasser Modirshahla
Jul 19, 2014·Journal of Hazardous Materials·Zhong PanAria Amirbahman
Dec 16, 2011·Journal of Hazardous Materials·Berkant Kayan, Belgin Gözmen
Mar 13, 2016·Journal of Environmental Sciences (China)·Qianyuan WuHongying Hu
Apr 9, 2008·Journal of Hazardous Materials·M A RaufBahadir K Körbahti
Oct 22, 2014·Environmental Science and Pollution Research International·Fei YuDongsu Bi
Feb 7, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Xinhao ShiYuezhong Xian

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