Effect of Surfactants on Kinetics and Oxidation of Decoloration of Methyl Violet and Ethyl Violet by Potassium Peroxydisulphate

Abstract

The kinetics of oxidation of methyl violet (MV) and ethyl violet (EV) by potassium peroxy disulphate (K₂S₂O₈) have been studied colorimetrically in the presence of cationic surfactant cetyl trimethyl ammonium bromide (C₁₆TABr), anionic sodium dodecyl sulphate (SDS) and nonionic
(Triton X-100) surfactants at 30ºC. The reaction is slowed down in the
presence of SDS and Triton X-100 while rate acceleration is observed in
C₁₆TABr micellar media. On the basis of kinetic results, it can be inferred
that only electrostatic interactions are dominant in the case of SDS whereas
hydrophobic and electrostatic interactions play an important role for
C₁₆TABr.