| Abstract |
| The aim of this study was to investigate the Cd(II) removal using agricultural byproduct corncob adsorbent in the aqueous solution. Effect of various process parameters, viz., initial Cd(II) concentration, pH and adsorbent dose has been studied for the removal of Cd(II). Batch experiments were carried out at various pH (2-7), adsorbent dose (2.5-20 g), Cd(II) concentration (5-500 mg/L) for a contact time of 60 min. The FT-IR (Fourier transform infrared spectroscopy) spectra of the corncob indicated that the carbonyl and carboxylic groups were major binding sites with Cd(II) ions. Corncob removed successfully 99% of the Cd(II) ions in the aqueous solution at pH 6. The adsorption process was fast and isotherm data better fit to the Langmuir isotherm than the Freundlich isotherm models. In addition, thermodynamic parameters (△G, △H, and △S)were also calculated from data obtained from experiments performed to study the effect of temperatures. The negative values of change in Gibbs free nergy indicate the feasibility and spontaneous nature of the adsorptive treatment. Taking all the above results into consideration, corncob is an inexpensive and excellent adsorbent. |
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| Key Words |
| Adsorption, Agricultural waste, Cadmimun, Corncob, Heavy metal, Wastewater |
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