Thermodynamic Studies for Adsorption of Cd2+ and Pb2+ from Waster Water on Modified Walnut Shell

Shao Hua He; Dan Wang; Qing Qiu Kong; Xi Wu

doi:10.4028/www.scientific.net/AMM.737.622

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 737Thermodynamic Studies for Adsorption of Cd2+ and...

Thermodynamic Studies for Adsorption of Cd²⁺ and Pb²⁺ from Waster Water on Modified Walnut Shell

Abstract:

The adsorption isothermal curve and thermodynamic adsorption of Cd²⁺ and Pb²⁺ on modified walnut shell from waster water were investigated using batch technique. The equilibrium adsorption data are fitted to Langmuir and Freundlich isotherm models and the model parameters are evaluated. The Langmuir isotherm model shows a better fit to adsorption data than the Freundlich isotherm model for the sorption of Cd²⁺ and Pb²⁺on modified walnut shell. The maximum adsorption capacity of Cd²⁺ and Pb²⁺ by modified walnut shell is found to be 32.68 mg·g^-1 and 84.75 mg·g^-1 at 298K temperature, respectively. The adsorption processes of Cd²⁺ and Pb²⁺ has feasibility and spontaneous nature. Thermodynamic parameters depict the endothermic nature of sorption and the process is spontaneous and favorable.

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Periodical:

Applied Mechanics and Materials (Volume 737)

Pages:

622-626

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.737.622

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Online since:

March 2015

Authors:

Shao Hua He, Dan Wang, Qing Qiu Kong, Xi Wu

Keywords:

Adsorption Isothermal Curve, Modified, Thermodynamic Adsorption, Walnut Shell

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