© Global Journal Of Pure And Applied Sciences . 2011. Vol. 17 No. 1
Publisher: Bachudo Science Co. Ltd
Thermodynamic Assessment of Anionic Ligands - Modified Palm Kernel Febre In The Sorption of Some Toxic Metals
P. O. Okolo, J. M. Okuo
KEYWORDS: Toxic metals, sorption, blended palm kernel fibre (BPKF)
ABSTRACT:Coconut husk and palm kernel fibre are separately pulverized to obtain 250um particle size and then blended in a 1:1 ratio to obtain the Blended Palm Kernel Fibre (BPKF). The BPKF was thiolated and then employed as adsorbent in adsorption studies of Co2+, Cd2+ and Ni2+ ions. The effects of pH and anionic ligands (EDTA, Cl3 and enthylenediamine) on the sorption process are also investigated. The results indicate that for the ligand – free adsorbent, sorption generally increased with increase in pH, optimum pH being established between 5.0 and 6.0 for the three toxic metal ions studied. The presence of the ligands (ethylenediaminettraacetic acid, EDTA, enthylenediamine, en,and chloride ion, Cl3) generally improved the sorption capacity for the adsorbent, the best being Cl3 at optimum pH of 2.0 (for Co2+) and 5.0 (for Ni2+ and Cd2+). The thermodynamic studies reveal that the adsorption process is non – spontaneous in the forward direction.
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