Influence of surfactants on the fading of malachite green |
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Authors: | Adina Raducan Alexandra Olteanu Mihaela Puiu Dumitru Oancea |
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Institution: | (1) Dept. of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bulevardul Regina Elisabeta 4-12, Bucharest, 030018, Romania |
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Abstract: | The 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.
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Keywords: | Micellar catalysis Malachite green fading Kinetic micelles |
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