

Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach
Jayachamarajapura Pranesh Shubha (1,*)



(1) Department of Chemistry, Don Bosco Institute of Technology, Kumbalagodu, Bangalore-560074, India
(2) Department of Chemistry, Don Bosco Institute of Technology, Kumbalagodu, Bangalore-560074, India
(3) Department of Chemistry, Central College Campus, Bangalore University, Bangalore-560001, India
(*) Corresponding Author
Received: 22 Apr 2013 | Revised: 17 Jul 2013 | Accepted: 06 Aug 2013 | Published: 31 Dec 2013 | Issue Date: December 2013
Abstract
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.

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DOI: 10.5155/eurjchem.4.4.408-413.806
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Don Bosco Institute of Technology, Kumbalagodu, Bangalore-560074, India; Visvesvaraya Technological University Research Grants, NO VTU/Aca./2012-13/A-9/2439.
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