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2011 (Vol. 3, Issue: 09)
Article Information:

Optimization and Modeling of Hexavalent Chromium Removal from Aqueous Solution Via Adsorption on Multiwalled Carbon Nanotubes

Mina Gholipour, Hassan Hashemipour Rafsanjani and Ataollah Soltani Goharrizi
Corresponding Author:  Mina Gholipour 

Key words:  Adsorption, adsorption isotherm, adsorption kinetics, multiwalled carbon nanotubes, thermodynamic parameters, ,
Vol. 3 , (09): 880-886
Submitted Accepted Published
2011 June, 14 2011 August, 08 2011 September, 20
Abstract:

Hexavalent chromium and its derivatives are potential pollutant due to their mortal affects. Therefore, It is essential to remove these components from wastewaters before disposal. Adsorption can be effective and versatile method for removing of hexavalent chromium. In this article, removal of hexavalent chromium via adsorption on multiwalled carbon nanotubes was investigated as a function of adsorbent dosage, initial solution pH, initial Cr(VI) concentrations, contact time and temperature. The batch experiments were conducted at 3 different temperatures (17, 27 and 37C) and shows that Cr (VI) removal obeys pseudo-second order rate equation. Rate constant (K) values in 3 temperatures, pre-exponential factor and adsorption activation energy (E) was also obtained. The sorption data fitted well with Freundlich isotherm adsorption model. Thermodynamic parameters such as Gibbs free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) for Cr(VI) adsorption were estimated and Results suggest that the adsorption process is a spontaneous and endothermic.
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  Cite this Reference:
Mina Gholipour, Hassan Hashemipour Rafsanjani and Ataollah Soltani Goharrizi, 2011. Optimization and Modeling of Hexavalent Chromium Removal from Aqueous Solution Via Adsorption on Multiwalled Carbon Nanotubes.  Research Journal of Applied Sciences, Engineering and Technology, 3(09): 880-886.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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