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.2017.502002

 

   

Research Article

 

      Equilibrium, Kinetic and Thermodynamic Studies on Biosorption of Ni(II) and   Cu(II) by using Nyctanthes arbor-tristis leaf Powder    
K. Subbarayudu, R. Prathibha, C. Narasimha Rao, K. Sivakumar, P. Venkateswarlu*
ABSTRACT
 
The use of low-cost and ecofriendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing metal ions from aqueous solution. The influence of various parameters on biosorption was established to optimize nickel(II) and copper(II) ions removal from aqueous solutions using Nyctanthes arbor-tristis leaf powder. The pH value for maximum metal ion adsorption was determined as 6.0 and 5.0 for Ni(II) and Cu(II) ions respectively. The adsorption follows pseudo-second order model and rate constants were calculated. The metal ion adsorption equilibrium was satisfactorily described by the Langmuir isotherm model than Freundlich model. The thermodynamic parameters such as standard Gibb’s free energy (∆Go), standard enthalpy (∆Ho) and standard entropy (∆So) changes were evaluated and concluded that this system was spontaneous and endothermic in nature.
     
     

Key words:  Nyctanthes arbor-tristis leaf powder, adsorption, nickel, copper, kinetics, thermodynamics

 

 

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