Volume No. 7 Issue No.: 1A Page No.: 275-284 July-September 2012

 

ADSORPTIVE REMOVAL OF MALACHITE GREEN (OXALATE) BY LOW COST ADSORBENT

 

Subbareddy Y., Jeseentharani V., Jayakumar C., Nagaraja K. S. and Jeyaraj B.*

Department of Chemistry and Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai, Tamil Nadu (INDIA)

 

Received on : July 05,2012

 

ABSTRACT

 

This study investigated the potential use of a low-cost Fullerís Earth (FE) for removal of Malachite Green oxalate (MG) dye from an aqueous solution. Batch studies were performed to evaluate the influence of various experimental parameters like adsorbent dose, effect of pH, initial dye concentration at different temperature and different contact time and on the removal of MG. The experimental data were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich isotherms. The isothermal adsorption data fitted best to the Langmuir model. The maximum adsorption capacity of FE was found to be 1.96 x10-4mol/g for MG at room temperature according to the Langmuir equation. The mean energy of adsorption (E) values was in the range of 25.828 kJ/mol to 27.317 kJ/mol, indicating that chemisorption might be major mode in the adsorption of MG onto FE. Adsorption kinetics was studied using pseudo first order and pseudo second order models. Adsorption data of MG onto FE was fitted well by the pseudo second order model. Thermodynamic studies were carried out and the parameters suggest that the process of removal of MG by FE is a spontaneous and endothermic nature since ΔG° value was negative and ΔH° value was positive.

 

Keywords : Adsorption, Fuller

 

 

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