Volume 6, Issue 5, October 2017, Page: 77-84
Biosorption of Cd(ll), Cu(ll) and Ni(ll) Ions from Aqueous Solution Using Jatropha Curcas Seed Pod
Onwu Francis Kalu, Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Nigeria
Nwokedi Chizoba Bridget, Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Nigeria
Received: Mar. 13, 2017;       Accepted: May 15, 2017;       Published: Oct. 24, 2017
DOI: 10.11648/j.am.20170605.15      View  2245      Downloads  123
Batch adsorption studies were conducted to determine the extent and nature of adsorption of Ni(ll), Cu(ll) and Cd(ll) ions from aqueous solutions onto JatrophacurcasSeed pod. The effects of pH, initial metal ion concentration and presence of co-ions were studied. Results showed that the adsorption process was dependent on pH, having optimum pH for adsorption of Ni(ll) at 7.0 and with maximum amount adsorbed as 9.23 mg/g. That of Cu(ll) occurred at pH 8.0 with maximum amount adsorbed as 9.65 mg/g while for Cd(ll), the pH for optimum adsorption occurred at pH 6.0 with maximum amount of 9.99 mg/g adsorbed. Evaluation of percentage removal shows that the percentage of Ni(ll), Cu(ll) and Cd(ll) adsorbed at their optimum pH corresponded to 92.30%, 96.50% and 99.90% respectively. Increasing the initial concentration of the metal ions was also found to increase the adsorption capacity for the metal ions by the adsorbent. The experimental data were interpreted using three isotherm models viz; the Langmuir, Freundlich and Dubinin-RadushKevich isotherms. Results showed that the Freundlich isotherm provided the best fit to the experimental adsorption data. The mean free energy values, E (which ranged from 1.343 to 2.275 kJ mol-1) calculated from the Dubinin-RadushKevich (D-R) isotherm equation suggests weak interaction between the metal ions and the adsorbent, thus revealing that the mode of the adsorption process follows physisorption. Assessment of competitive adsorption of the metal ions from mixed metal ions solutions shows that the presence of foreign ions in the solution diminished the adsorption density of the metal ion under consideration. The results generally showed that the order of adsorption of the metal ions onto the biosorbent follows the trend Cd(ll) > Cu(ll) > Ni(ll).
Adsorption Isotherms, Biosorbent, Heavy Metals, JatrophaCurcas, Wastewaters
To cite this article
Onwu Francis Kalu, Nwokedi Chizoba Bridget, Biosorption of Cd(ll), Cu(ll) and Ni(ll) Ions from Aqueous Solution Using Jatropha Curcas Seed Pod, Advances in Materials. Vol. 6, No. 5, 2017, pp. 77-84. doi: 10.11648/j.am.20170605.15
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