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oai:ojs.www.eurjchem.com:article/806 2013-12-31T06:16:57Z eurjchem:ART driver

Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach Shubha, Jayachamarajapura Pranesh Vinutha, Kotabagi Puttaswamy, Puttaswamy Azo dye Amido black Chloramine-T Bromamine-T Acidic medium Oxidation kinetics The kinetics of oxidative decolorization of amido black (AB, Naphthol blue black) by chloramine-T (CAT) and bromamine-T (BAT) in acidic medium has been investigated spectrophotometrically (λmax = 618 nm) at 298 K. Kinetic runs were performed under pseudo first-order conditions of [Oxidant]o >> [AB]o. Under identical experimental conditions, reactions with both the oxidants follow identical kinetics with a first-order dependence on each [Oxidant]o and [AB] and a fractional-order dependence on [HClO4]. Stoichiometry of the reaction was found to be 1:4 and the oxidation products were identified. The reaction was studied at different temperatures and various activation parameters have been computed. Effects of p-toluenesulfonamide, halide ions, ionic strength and dielectric constant of the medium have been investigated. Reaction mixture fails to induce polymerization of acrylonitrile. The rate of oxidation of AB is about three-fold faster with BAT as compared to CAT. This may be attributed to the difference in electrophilicity of Cl+ and Br+ ions and also the Vander Waals radii of chlorine and bromine. Plausible mechanism and related rate law have been deliberated for the observed kinetics. Atlanta Publishing House LLC 2013-12-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/806 10.5155/eurjchem.4.4.408-413.806 European Journal of Chemistry; Vol. 4 No. 4 (2013): December 2013; 408-413 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/806/PDF