Removal of Malachite Green using Mahua Oil Cake

Abstract

The objective of this work is reduction of malachite green in wastewater using mahua residual cake which is a byproduct after the extraction of mahua oil. The adsorption of malachite green, cationic dye onto agricultural by products has been investigated in this study. The physico-chemical characteristics of the adsorbent have been analyzed in detail. The adsorption of the dye was solution Ph dependent. The kinetic experimental data was analyzed using two kinetic equation pseudo first order equation and pseudo second order equation. It was observed that it followed the second order equation. The Langmuir, Freundlich and Temkin isotherms were used to fit the equilibrium data and the results showed that the Freundlich isotherm seemed to agree better than the Langmuir. The maximum malachite green capacity was found to be 235.6mg/g at 40°C. The Gibbs energy was calculated which showed that it is an exothermic reaction. Desorption experiment was also studied where it showed that maximum desorption was observed in acidic medium. The results indicated that mahua oil cake is an attractive adsorbent for removing basic dye from aqueous solution.