Indian Journal of Advances in Chemical Science Volume: 5, Issue: 2, April 2017

 
             
   
   

ISSN No.: 2320-0898 (Print); 2320-0928 (Electronic)

DOI:  10.22607/IJACS.2017.502001

 

   

Research Article

 

      Adsorption of Lead and Zinc on Curcuma longa Leaf Powder from Aqueous Solutions    
K. Subbarayudu, R. Prathibha, C. Narasimha Rao, K. Sivakumar, P. Venkateswarlu*
ABSTRACT
 
In this paper, adsorption of lead and zinc on Curcuma longa leaf powder from solutions with environmentally relevant concentrations of metals was studied. The kinetics of adsorption of metal ions was analyzed. Optimum pH values for maximum metal ion adsorption were determined. Adsorption isotherms were expressed by Langmuir and Freundlich models. Langmuir adsorption model fits the experimental data reasonably well than Freundlich model. The thermodynamic parameters - such as standard Gibb’s free energy change (ΔG), standard enthalpy change (ΔH), and standard entropy change (ΔS) - were evaluated, which indicated that this system was spontaneous and endothermic. The studies showed that this low-cost material could be used as an efficient adsorbent for the removal of lead and zinc from aqueous solutions.
     
     

Key words: Curcuma longa leaf powder, Adsorption, Lead, Zinc, Kinetics, Thermodynamics.

 

 

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