Research Article

Central European Journal of Chemistry

, Volume 6, Issue 1, pp 89-92

Influence of surfactants on the fading of malachite green

  • Adina RaducanAffiliated withDept. of Physical Chemistry, Faculty of Chemistry, University of Bucharest Email author 
  • , Alexandra OlteanuAffiliated withDept. of Physical Chemistry, Faculty of Chemistry, University of Bucharest
  • , Mihaela PuiuAffiliated withDept. of Physical Chemistry, Faculty of Chemistry, University of Bucharest
  • , Dumitru OanceaAffiliated withDept. of Physical Chemistry, Faculty of Chemistry, University of Bucharest

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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.

http://static-content.springer.com/image/art%3A10.2478%2Fs11532-007-0066-0/MediaObjects/11532_2006_Article_66_Fig1_HTML.jpg

Keywords

Micellar catalysis Malachite green fading Kinetic micelles