The study investigates the oxidation of indigo carmine using potassium peroxy diphosphate in the presence and absence of cationic CTAB and anionic SDS micelles. The research was conducted in an aqueous sulfuric acid medium with a maintained ionic strength of 3.0 moldm-3 using sodium sulfate. The stoichiometry of the reaction is reported as 1:1. The pseudo-zero-order constant was determined from linear plots of absorbance versus time where [IC] < [PDP]. The reaction follows zero-order kinetics concerning varying [IC], first-order kinetics concerning varying [H+] and [PDP] in the presence and absence of micelles. The reaction rate increases with increasing [CTAB] and [SDS] and reaches a maximum value. The rate [surfactant]-profile has a limiting nature, indicating that the reaction is unimolecular on the surface of the micelle. By applying Berezin treatment for the kinetic pattern, the binding constant of peroxy diphosphate is determined with CTAB and SDS micelles.

Author(s) Details:

Kalyana Chakravarthy Mutnuru,
Department of Chemistry, Anil Neerukonda Institute of Technology & Sciences, Visakhapatnam, Andhra Pradesh, India.

K. Rama Krishna,
Department of Engineering Chemistry, Andhra University, Visakhapatnam, Andhra Pradesh, India.

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