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Journal of Chemistry
Volume 2015 (2015), Article ID 735631, 6 pages
Research Article

Removal of Pyrethrin from Aqueous Effluents by Adsorptive Micellar Flocculation

1Department of Chemical Engineering, National University of Science and Technology, Bulawayo, Zimbabwe
2School of Engineering Sciences and Technology, Chinhoyi University of Technology, Chinhoyi, Zimbabwe

Received 27 August 2014; Revised 6 January 2015; Accepted 6 January 2015

Academic Editor: Wenshan Guo

Copyright © 2015 Pardon K. Kuipa and Olga Kuipa. 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.


The equilibrium adsorption of pyrethrin onto aggregates formed by the flocculation of micelles of the surfactant sodium dodecyl sulphate (SDS) with aluminium sulphate is reported. The experimental results were analysed using different adsorption isotherms (Langmuir, Freundlich, Redlich-Peterson, Sips, Radke-Prausnitz, Temkin, linear equilibrium, and the Dubin-Radushkevich isotherms). The Freundlich and linear equilibrium isotherms best describe the adsorption of pyrethrin onto SDS micellar flocs, with the Freundlich adsorption constant, , and the mass distribution coefficient, , of 64.266 ((mg/g)(L/mg)1/n) and 119.65 L/g, respectively. Applicability of the Freundlich adsorption model suggests that heterogeneous surface adsorption affects the adsorption. The mean free energy value estimated using the Dubinin-Radushkevich isotherm was 0.136 kJ/mol indicating that physisorption may be predominant in the adsorption process.