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Ru (III) Catalysed Oxidative Degradation of Triarylmethane Dye using Acidic Chlorite

Brijesh Pare, Neelkamal, Pardeep Singh, Rajani Vijay and V. W. Bhagwat

The oxidation reaction of CV+ by acidic chlorite exhibits an interesting linear phenomenon. The depletion of CV+ in presence of excess of chlorite (ClO2 –) and (H+) follows an exponential decay involving pseudo-first order kinetics. The catalysed oxidative reaction with Ru (III) also proceeds in the same way. Detailed kinetics has been studied by using spectrophotometric methods. The stoichiometry of the uncatalysed reaction is CV+ + 2 ClO2 –  P1 + P2 + 2Cl–. Increment in ionic strength by the addition of neutral salt resulted in decrease in rate constant, which indicates the participation of two neutral species in rate determining step. The effect of pH on oxidative mechanism has been reported. Reaction mechanism with reaction dynamics for both uncatalysed and catalysed reaction has been proposed. The catalytic range for Ru (III) was found to be 1. 0 x 10–7 mol dm–3. Role of acid has been found to be complex in nature.