Influence of Sodium Pentadecylsulfonate on the Rate of Diphenylamine Oxidation by Peroxidisulfate in Water-Dioxane Mixtures

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Authors

  • Yerevan State University, Department of Physical and Colloid Chemistry, Yerevan 3 75025, A. Manougian St. 1 ,AM
  • Yerevan State University, Department of Physical and Colloid Chemistry, Yerevan 3 75025, A. Manougian St. 1 ,AM

DOI:

https://doi.org/10.18311/jsst/1999/2069

Keywords:

Peroxydisulfate, Diphenylamine, Surfactant, Action of Micelles on Oxidation Rate.

Abstract

The kinetics of the reaction of Ph2NH (A) with S2O2-8 under O2 free condition was studied in homogenous medium using H2O+dioxane (33% by volume) solution in presence of the PDS anion active micelles. In absence of PDS micelles, Ph2NH oxidation is consecutive, the final product being diphenylbenzidine violet. When PDS micelles are present, the over-all reaction rate decreases. At [E-30]0 ≥ 0.16 M, the reaction is stopped at the stage of tetraphenylhydrazine (TPhH) formation, which leads to slowing down of the over-all rate of S2O2-8 consumption. This fact has been explained assuming that water soluble S2O2-8 and oil-soluble TPhH are localized in different loci in the reaction medium. The distribution coefficient (PA) of the reductant between micellar and water as well as water-EtOH-dioxane solutions has been determined.