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|Title:||Adsorption Characteristics of Hg(II) on Humus-Kaolin Complex: Kinetics and Equilibrium|
|Authors:||Abraham, Beena T|
Anirudhan, T S
|Abstract:||The kinetics and equilibrium of the adsorption of Hg(II) by humic acid coated kaolin (HA-kaolin), a synthetic soil , are studied. The parameters studied are: pH, initial metal ion concentration, particle size of the HA-kaolin and temperature. The uptake of Hg(II) increases as the pH is increased and reaches a maximum of 82.8% for the initial concentration of 10 mg/L at pH 9.0. The applicability of external mass transfer and intraparticle mass transfer diffusion models has been investigated. The kinetic parameters such as mass transfer coefficient, diffusion coefficient and intraparticle rate constant as a function of initial metal concentration, particle size of the solid and temperature have been calculated for predicting the nature of adsorption. The intraparticle diffusion of metal ions through pores in the HA-kaolin is found to be the main rate limiting step. Temperature dependence indicates the endothermic nature of the process. The significance of the two linear relationships obtained by plotting the data according to the conventional Langmuir equation is discussed in terms of the binding energies of the two population sites involved which have a widely differing affinity for Hg(II) ions.|
|ISSN:||0975-1084 (Online); 0022-4456 (Print)|
|Appears in Collections:||JSIR Vol.58(10) [October 1999]|
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