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Vol. 31 No. 3 (2019): Vol 31 Issue 3

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Effect of Cationic/Anionic Mixed Micelles on Reaction Kinetics of Alkaline Hydrolysis of Crystal Violet

https://doi.org/10.14233/ajchem.2019.21701
Qidist Yilma
Department of Chemistry, Wollega University, P.O. Box: 395, Nekemete, Ethiopia
Dunkana Negussa
Department of Chemistry, Wollega University, P.O. Box: 395, Nekemete, Ethiopia
Y. Dominic Ravichandran
Department of Chemistry, Wollega University, P.O. Box: 395, Nekemete, Ethiopia; Department of Science and Humanities, Karpagam College of Engineering, Coimbatore-641032, India

Corresponding Author(s) : Dunkana Negussa

dunkana11@yahoo.com

Asian Journal of Chemistry, Vol. 31 No. 3 (2019): Vol 31 Issue 3

Abstract

Kinetics of alkaline hydrolysis of crystal violet, a triphenylmethane dye in the micellar environment of cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfonate (SDS) and binary mixtures of these surfactants was studied. The regression parameters, together with rate constants and binding constants were obtained by analyzing the rate surfactant profiles using cooperativity model. It was observed that the reaction was catalyzed by both surfactants. The catalytic factor increased by 10 times in SDS and 38 times in CTAB indicating that binding of crystal violet to the micellar surface is stronger in pure CTAB than SDS but the strength drastically reduced in the mixtures of the surfactants. Reduction of binding constant became more important as the mole fraction of CTAB was improved in the mixture. The kinetic data were investigated using Piszkiewicz model and Raghavan-Srinivasan model. The data obtained from the models were in good agreement with the experimental values.

Keywords

Crystal violet Pseudo-phase Mixed Micelles Piszkiewicz's model
Yilma, Q., Negussa, D., & Ravichandran, Y. D. (2019). Effect of Cationic/Anionic Mixed Micelles on Reaction Kinetics of Alkaline Hydrolysis of Crystal Violet. Asian Journal of Chemistry, 31(3), 651–655. https://doi.org/10.14233/ajchem.2019.21701
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