Volume No. 7 Issue No.: 1A Page No.: 321-329 July-September 2012

 

BIOSORPTION OF CRYSTAL VIOLET FROM AQUEOUS SOLUTION BY Citrullus lanatus (WATERMELON) RIND

 

Bharathi K. S.* and Ramesh S. T.

Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, (INDIA)

 

Received on : May 10,2012

 

ABSTRACT

 

The efficiency of Citrullus lanatus (Watermelon) rind, an agricultural solid waste was investigated in this study as a novel adsorbent for the removal of Crystal Violet (CV) from aqueous solution. Batch mode experiments were conducted to study the effects of contact time, dose of adsorbent, pH and temperature. Equilibrium data were analyzed using the Langmuir and Freundlich isotherms. Different thermodynamic parameters, like Gibb’s free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) of the adsorption process have also been evaluated. The thermodynamic parameters of CV biosorption indicated that the process is spontaneous and endothermic. Two simplified kinetic models including pseudo-first-order and pseudo-second-order equation were selected to follow the adsorption process. The pseudo-second-order kinetics was the best for the adsorption of CV by Citrullus lanatus rind with good correlation. The results demonstrate that the biosorbent used in this study was found to be a promising material for adsorption of CV from aqueous solutions

 

Keywords : Citrullus lanatus rind, Basic dye, Equilibrium, Kinetics, Thermodynamic

 

 

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