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|Title:||Batch metal removal by modified hydrous titanium (IV) oxide gel: Kinetics and thermodynamics|
|Authors:||Shubha, K P|
Anirudhan, T S
|Abstract:||The adsorption ability of polyacrylamide grafted hydrous titanium (lV) Oxide gel for heavy metals in aqueous solutions has been investigated by means of batch adsorption tests. The adsorbent material on.IR spectral characterization showed the presence of peripheral - COOH group and exhibits a very high adsorption potential for Pb (II), Hg(II) and Cd(II). Kinetic measurements have been made as a function of agitation time, initial metal concentration, adsorbent dose, pH and temperature. The process follows a first - order kinetics. The intraparticle diffusion of metal ions through pores in the adsorbent was shown to be the main rate limiting step. The sorbent is effective for the quantitative removal of metal ions at pH.6.0. Temperature dependence indicates the endothermic nature of the process. A Langmuir isotherm model fits the equilibrium data well. Thermodynamic parameters were calculated for predicting the nature of adsorption. The method was applied for synthetic wastewaters. Acid regeneration of the adsorbent has been tried.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.05(2) [April 1998]|
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