Adsorption of Lead (Ii) Ion from Aqueous Solution Using Activated Carbon Produced From Oil Bean Seed Shell

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Author(s) T. O. Chime | Aningo JoyAnn Nwamaka | Udeh Onyebuchi Cornellius
Pages 341-350
Volume 6
Issue 9
Date September, 2016
Keywords Oil Bean Seed Shell, Adsorption, Activated Carbon, Carbonization, Activation

Abstract

This work was carried out to study the efficacy of the activated carbon produced from oil bean seed (Pentaclethra macrophylla benth) shell as a low cost adsorbent for the removal of pb (ii) ion from aqueous solution. The surface area of the raw sample was increased from 205.4m2/g to 295m2/g after carbonization and activation. The structural characteristics of the activated carbon produced were determined through FTIR spectrum and SEM images. Batch adsorption experiments were carried out to determine the effect of pH, adsorbent dose and contact time. 100% adsorption was achieved with an adsorbent dose of 0.5g, time of agitation of 60mins, pH of 7.0, initial concentration of 250mg/l and temperature of 298K. The equilibrium data was fitted to Langmuir, Freundlich, Tempkin and Dubinin – Radushkevich models. The Langmuir isotherm model gave the best fit with correlation coefficient (R2) of 0.839 for pb (ii) adsorption. The kinetic studies showed that the adsorption process followed pseudo-second-order model with R2 of 0.992.The ΔH and ΔS values are -79.349kj/mol and -224.73j/molk respectively. This indicates a feasible, spontaneous and exothermic adsorption process. The results of this studies showed that the activated carbon produced from oil bean seed shell is an effective low cost adsorbent for the removal of pb (ii) ion from aqueous solution.

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