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The kinetics of oxidative decolorization of acid orange 10 (AO10) by chloramine-B and bromamine-B in HClO4 medium has been investigated spectrophotometrically (λmax = 475 nm) at 298 K. Kinetic runs were performed under pseudo first-order conditions of [oxidant]o >> [AO10]o. Under identical experimental conditions, reactions with both the oxidants follow identical kinetics with a first-order dependence on each [oxidant]o and [AO10] and a fractional-order dependence on [HClO4]. Stoichiometry of the reaction was found to be 1:1 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 AO10 is about two-fold faster with BAB as compared to CAB. This may be attributed to the difference in electrophilicities of Cl+ and Br+ ions and also the van der Waal’s radii of chlorine and bromine. Plausible mechanism and related rate law have been deliberated for the observed kinetics.

international journal of innovative research in science engineering and technology/international journal of innovative research in science, engineering and technology

Kinetics and Mechanistic Chemistry of Sodium N-Halobenzenesulfonamides Oxidative Decolorization of Azo Dye Acid Orange 10 in Acid Medium: Spectrophotometric Approach