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Environmental Engineering Research 2009;14(1): 26-31. DOI: https://doi.org/10.4491/eer.2009.14.1.026
Sorbent Characteristics of Montmorillonite for Ni2+ Removal from Aqueous Solution
Christianah Olakitan Ijagbemi, and Dong-Su Kim
Environmental Science and Engineering, Ewha Womans University, Seoul, South Korea
Corresponding Author: Dong-Su Kim ,Tel: +82-2-3277-2394, Fax: +82-2-3277-3275, Email: dongsu@ewha.ac.kr
Received: August 7, 2008;  Accepted: December 9, 2008.
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ABSTRACT
Sorption of Ni2+ in aqueous solution was studied using montmorillonite. The experimental and equilibrium data fitted well to the Langmuir isotherm model. From the kinetics data for nickel sorption onto montmorillonite, the diffusion of Ni2+ inside the clay particles was the dorminant step controlling the sorption rate and as such more important for Ni2+ sorption than the external mass transfer. Ni2+ was sorbed due to strong interactions with the active sites of the sorbent and the sorption process tends to follow the pseudo second-order kinetics. Thermodynamic parameters (ΔG°, Δ H°, and ΔS°) indicated a non spontaneous and endothermic adsorption process while the positive low value of the entropy change suggests low randomness of the solid/solution interface during the uptake of Ni2+ by montmorilionite. Heavy metals such as Ni2+ in aqueous bodies can effectively be sorbed by montmorillonite.
Keywords: Montmorillonite | Nickel | Kinetics | Adsorption isotherms
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