Surface chemistry and adsorption mechanism of cadmium ion on activated carbon derived from Garcinia mangostana shell

Kang, Y.L. and Poon, M.Y. and Monash, P. and Ibrahim, S. and Saravanan, P. (2013) Surface chemistry and adsorption mechanism of cadmium ion on activated carbon derived from Garcinia mangostana shell. Korean Journal of Chemical Engineering, 30 (10). pp. 1904-1910. ISSN 0256-1115

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Abstract

A detailed surface characterizations and adsorption mechanism of Cd2+ on chemical activated carbon (CAC) prepared from Garnicia mangostana shell were investigated. The activation is accomplished in self-generating atmosphere using phosphoric acid as activating agent. The characterizations performed are elemental analysis, functional group identification, N2 adsorption isotherm and surface charges. Adsorption mechanism of metal ion was tested using Cd2+ as model ion. CAC achieved BET surface area of 1,498 m2/g with a mixture of micro and mesopores. The point of zero charge is observed to be at pH 2.8 and the optimum pH for Cd2+ adsorption on CAC is 12. The adsorption isotherm followed the Freundlich model, and the adsorption kinetics was explained by pseudo-second order kinetic model. From thermodynamic studies, the adsorption was found to be physical adsorption. X-ray photoelectron spectroscopy (XPS) confirmed the adsorption of Cd2+ onto CAC as +2 oxidation state. © 2013 Korean Institute of Chemical Engineers, Seoul, Korea.

Item Type: Article
Additional Information: 229BS Times Cited:0 Cited References Count:26
Uncontrolled Keywords: Garcinia mangostana, Activated carbon, Adsorption mechanism, Surface chemistry, Aqueous-solution, Methylene-blue, Fly-ash, Nickel, Removal, Porosity, Binary, Lead.
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 09 Apr 2014 01:32
Last Modified: 03 Jul 2017 08:32
URI: http://eprints.um.edu.my/id/eprint/9447

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