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Removal of Cu²⁺ from aqueous solution by adsorption onto quail eggshell: Kinetic and isothermal studies

Journal of Environment & Biotechnology Research, Vol. 5, No. 1, Pages 1-9, October 2016

Akinhanmi Temilade Fola, Adeogun Abideen Idowu, Adegbuyi Adetutu

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ABSTRACT

Adsorbent prepared from quail eggshell was used for the removal of Cu²⁺ from aqueous solution. The surface morphology of the adsorbent was characterised using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray diffraction (XRD). Experimental data obtained from batch equilibrium studies were subjected to two-parameter (Freundlich, Langmuir, Tempkin and Dubinin-Radushkevich (D-R)) and three-parameter (Redlich-Peterson, Sips, Hill and Khan) isotherm models. The experimental data were best fitted to all of the isotherms with correlation coefficient > 0.9. The adsorption energy (E) from the D-R isotherm was found to be 0.08 kJ/mol, which is an indication of physisorption favoured processes. Kinetic data were analysed with pseudo first-order, pseudo second-order, Avrami and Elovich kinetic models. The pseudo first-order and Avrami models best fitted the experimental data with correlation coefficent above 0.99 with an average relative and hybrid errors less than 5%. Intraparticle diffusion model analysis showed that the adsorption process comprises of two stages (rapid and slow phases).
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