European Journal of Chemistry 2013, 4(4), 408-413 | doi: https://doi.org/10.5155/eurjchem.4.4.408-413.806 | Get rights and content




  OPEN ACCESS | PEER-REVIEWED | RESEARCH ARTICLE

Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach


Jayachamarajapura Pranesh Shubha (1,*) , Kotabagi Vinutha (2) , Puttaswamy Puttaswamy (3)

(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 | 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.

4_4_408_413

Keywords


Azo dye; Amido black; Chloramine-T; Bromamine-T; Acidic medium; Oxidation kinetics

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DOI: 10.5155/eurjchem.4.4.408-413.806

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How to cite


Shubha, J.; Vinutha, K.; Puttaswamy, P. Eur. J. Chem. 2013, 4(4), 408-413. doi:10.5155/eurjchem.4.4.408-413.806
Shubha, J.; Vinutha, K.; Puttaswamy, P. Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach. Eur. J. Chem. 2013, 4(4), 408-413. doi:10.5155/eurjchem.4.4.408-413.806
Shubha, J., Vinutha, K., & Puttaswamy, P. (2013). Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach. European Journal of Chemistry, 4(4), 408-413. doi:10.5155/eurjchem.4.4.408-413.806
Shubha, Jayachamarajapura, Kotabagi Vinutha, & Puttaswamy Puttaswamy. "Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach." European Journal of Chemistry [Online], 4.4 (2013): 408-413. Web. 16 Dec. 2019
Shubha, Jayachamarajapura, Vinutha, Kotabagi, AND Puttaswamy, Puttaswamy. "Kinetics and mechanism of oxidation of amido black by sodium N-halo-p-toluenesulfonamides in acidic medium: Spectrophotometric approach" European Journal of Chemistry [Online], Volume 4 Number 4 (31 December 2013)

DOI Link: https://doi.org/10.5155/eurjchem.4.4.408-413.806

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