Volume No. 8 Issue No.: 4 Page No.: 964-973 April-June 2014

 

EQUILIBRIUM AND THERMODYNAMIC STUDIES OF METHYLENE BLUE BIOSORPTION FROM AQUEOUS SOLUTION USING Syzygium cumini L.

 

Gnana Kumari Talathoti, Suggala V. Satyanarayana*1 and King P.2

1. Department of Chemical Engineering, JNTUACE, Anantapuram (INDIA)
2. Department of Chemical Engineering, Andhra University, Vishakhapatnam (INDIA)

 

Received on : December 02, 2013

 

ABSTRACT

 

Removal of dyes from polluted effluent is an essential task for environmental protection. The studies carried through environmental biotechnology have shown that many sorbents present in the nature have great capacity for removal of dyes. Therefore, in the present work Syzygium cumini L is used for the removal of Methylene blue dye from aqueous solution. The effect of pH, initial dye concentration, biosorbent dosage, biosorbent average particle size and temperature are varied to study their effect on removal efficiency. It was found that a maximum amount of 93.45% dye was removed from the aqueous solution with 0.1 g of Syzygium cumini leaf powder from 30 ml of aqueous dye solution containing 20 mg/L of dye at room temperature and pH of 8 with Sorbent size 75 ?m in 20 min. The experimental data were fitted with Freundlich, Langmuir and Redlich-Peterson isotherms and good fit was observed with Langmuir isotherm. Thermodynamic parameters like Gibbs free energy, enthalpy and entropy is estimated and it is found that adsorption is an endothermic process.

 

Keywords : Methylene blue, Bio-sorption, Isotherms, Syzygium cumini L, Thermodynamic parameters

 

 

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