THERMODYNAMICS, KINETICS AND EQUILIBRIUM SORPTION STUDIES OF THE ADSORPTION OF MERCURY IN HG2+- RICE BRAN SYSTEM

Abdullahi Moyosore, Kamaladdeen Abdullahi

Abstract


Hg2+ions from mining and urban runoffs can easily contaminate various water sources due to their high solubility in water. Due to its simplicity and viability, adsorption was utilized to treat Hg2+ions -contaminated water using locally available rice bran as adsorbent. The adsorption behavior of the adsorbent was investigated using kinetics, thermodynamics and isotherm models. It was found that the adsorption of Hg2+ions onto the adsorbent follows a pseudo-second order model and was best described by the Freundlich isotherm. The adsorption capacity was found to increase with increasing contact time, adsorbent dosage, temperature and with increasing initial Hg2+ions concentration, with the highest adsorption capacity of 47.5 mg/L. The adsorption process was found to be spontaneous, endothermic and increases with temperature rise as the values obtained for thermodynamic parameters; ΔG, ∆Ho and ∆So are -1.36 x 10-3 Jmol-1, 144.09 Jmol-1 and 457.486 Jmol-1K-1, respectively. Results indicate that the freely abundant, locally available, low-cost adsorbent, rice bran could be economically viable for the removal of Hg2+ ions from mercury contaminated waste water. 

Keywords


Thermodynamics, Mercury, Adsorption, Rice bran, Kinetics, Isotherm.

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