Volume No. 11 Issue No.: 1 Page No.: 80-91 July-September 2016

 

EQUILIBRIUM, KINETIC AND THERMODYNAMIC STUDY OF ADSORPTION OF ERYTHROSINE-B FROM AQUEOUS SOLUTION BY ACTIVATED CARBON FROM BLACK GRAM HUSK (Vigna mungo L.)

 

Valliammai S., Subbareddy Y., Nagaraja K. S. and Jeyaraj B.*

Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai, Tamilnadu (INDIA)

 

Received on : April 15, 2016

 

ABSTRACT

 

Erythrosine–B dye, which causes carcinogenicity and neurotoxicity, is removed by adsorption technique using low cost Activated Carbon prepared from Black Gram Husk (ACBGH). ACBGH was characterized by SEM, FTIR, XRD and Raman Spectroscopy. SEM image of ACBGH showed porous and irregular external surface. It is clear that there is a good possibility for the dye molecules to be adsorbed on the surface of ACBGH. The surface area (480.10 m2/g) was determined by BET method. Batch experiments were performed to study the effects of contact time, adsorbent dose, temperature and pH on the percentage removal of Erythrosine-B dye. The data best fitted with the Langmuir model. The adsorption capacity of ACBGH for Erythrosine-B was 882.68 mg g-1. The adsorption process followed the pseudo second order equation kinetics. Thermodynamic studies showed that the adsorption was spontaneous, endothermic and entropy controlled. Desorption studies were done.

 

Keywords : Activated carbon, Adsorption, Isotherms, Kinetics, Thermodynamics

 

 

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