Abstract

KINETICS AND MECHANISM OF OXIDATIVE DECOLOURIZATION OF FOOD DYE SUNSET YELLOW BY TRICHLOROISOCYANURIC ACID IN AQUEOUS ACETIC ACID MEDIUM – A SPECTROPHOTOMETRIC APPROACH

Gayathri S. and Manivannan S.*

Abstract

The kinetics of Oxidative decolourization of Food Dye Sunset yellow by Trichloroisocyanuric acid in aqueous acetic acid medium has been investigated spectrophotometically (λmax = 482nm) at 303K. Kinetic runs were carried out pseudo first order condition in which large excess of [TCICA] compared with [Dye]. The reactions follow a fractional order dependence on [TCICA], first order dependence on [SY] and an inverse fractional order dependence on [H+]. The effect of dielectric constant of the medium has been studied. HOCl have been proposed as reactive oxidizing species. A suitable mechanism consistent with the experimental results has been proposed

Keywords: Food Dye, azo dye, trichloroisocyanuric acid, oxidation, decolourization, kinetics.