Influence of surfactants on the fading of malachite green

Author:

Raducan Adina1,Olteanu Alexandra1,Puiu Mihaela1,Oancea Dumitru1

Affiliation:

1. 1Dept. of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bulevardul Regina Elisabeta 4-12, Bucharest, 030018, Romania

Abstract

AbstractThe kinetics of the reaction between malachite green (MG) and sodium hydroxide (MG fading) was studied using a spectrophotometric method in the presence of two cationic surfactants, cetyl-benzyl-dimethyl-ammonium chloride (CBDAC) and hexadecyl-trimethylammonium bromide (HTAB) and one anionic surfactant, sodium dodecyl sulphate (SDS) at concentrations below and above critical micellar concentrations. The cationic surfactants have a catalytic effect, while the anionic surfactant has an inhibitory effect on the reaction. A kinetic model describing the influence of surfactant on reaction rate was developed. The results are discussed on the basis of electrostatic and hydrophobic interactions between the kinetic micelles and malachite green.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,General Chemistry

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