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|Title:||Removal of heavy metal ions from water using sawdust-based activated carbon|
Manju, G N
Anirudhan, T S
|Abstract:||The removal of Pb(II), Hg(II) and Cd(II) by activated carbon prepared from bicarbonate-treated rubber wood sawdust has been found to be concentration, pH and temperature dependent. The percentage adsorption of metal ions increased with decrease in initial concentration of metal ions, increase in adsorbent dosage and temperature. The optimum pH range for the removal of Pb(II) and Hg (II) is 4-8 whereas maximum uptake for Cd(II) is in the pH range 5-9. The applicability of Lagergren kinetic model has also been investigated. The equilibrium data at different temperatures fit well with the Langmuir isotherm. Thermodynamic constant (Ko) and standard free energy (ΔGO), enthalpy (ΔHo) and entropy (ΔS°) changes were calculated for predicting the nature of adsorption. The surface mass transfer coefficient as a function of initial adsorbate concentration has been determined. Desorption studies revealed that spent adsorbent can be regenerated and reused by 0.2 M HC1.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.04(6) [December 1997]|
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