Volume 2013 (2013), Article ID 839498, 10 pages
Electrochemical Behavior of Malachite Green in Aqueous Solutions of Ionic Surfactants
1Department of Chemistry, University of Dhaka, Dhaka 1000, Bangladesh
2University Grants Commission of Bangladesh, Agargaon, Dhaka 1207, Bangladesh
Received 22 July 2013; Accepted 24 August 2013
Academic Editors: H. Karimi-Maleh and R. Kizek
Copyright © 2013 Mohammad Mijanur Rahman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Electrochemical behavior of malachite green (MG) oxalate in aqueous solution was studied in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), and an anionic surfactant, sodium dodecyl sulfate (SDS) at a glassy carbon electrode using cyclic voltammetry. The electrochemical oxidation of MG has been characterized as an electrochemically irreversible diffusion-controlled process. Oxidative peak current sharply decreased with increasing SDS concentration, while a slight increase with increasing [CTAB] was apparent. The apparent diffusion coefficient, the surface reaction rate constant, and the electron transfer coefficient of MG clearly show correlation of the electrochemical behavior with the dissolved states of the surfactants. Electrochemical observations together with spectrophotometric results at varying surfactant concentrations provide evidence of interaction of MG with the surfactants to varying extent depending on the type of the surfactant and the concentration.