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ChemEngineering 2018, 2(3), 35; https://doi.org/10.3390/chemengineering2030035

Evaluation of Cd(II) Ion Removal from Aqueous Solution by a Low-Cost Adsorbent Prepared from White Yam (Dioscorea rotundata) Waste Using Batch Sorption

1
School of Chemical Engineering and Analytical Science, University of Manchester, Oxford Road, Manchester M13 9PL, UK
2
Alastair Martin—Present Address-Department of Engineering, Lancaster University, Bailrigg, Lancaster LA1 4YR, UK
3
Petrus Nzerem—Present address-Department of Petroleum and Gas Engineering, Nile University of Nigeria, Research and Institution Area, Jabi Airport Road Bypass, Abuja, FCT 900001, Nigeria
*
Author to whom correspondence should be addressed.
Received: 2 April 2018 / Revised: 12 June 2018 / Accepted: 21 June 2018 / Published: 3 August 2018
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Abstract

An agricultural residue, white yam (Dioscorea rotundata) tuber peel (YTBS), was used for the removal of Cd(II) ion from an aqueous solution using a batch method. The adsorbent was characterized using FTIR, TGA, SEM, EDX, N2 BET, XRD, and XRF. The optimization of sorption variables such as pH, contact time, adsorbent dose, and initial metal ion concentration at 25 °C were also carried out. The results indicated the dependence of sorption on the adsorbate pH and adsorbent dose, while the adsorption system reached equilibrium in 180 min. The sorption kinetics was fitted to three models (pseudo first order, pseudo second order, and Elovich) to validate the kinetics, and the pseudo first order was the best model for the description of Cd(II) uptake. Equilibrium isotherm modelling was also carried out using the Langmuir, Freundlich, and Temkin models, with the Langmuir isotherm giving the best fitting to the experimental results. The maximum loading capacity (qmax) of the adsorbent for Cd(II) obtained from the Langmuir isotherm model was 22.4 mg∙g−1 with an isotherm constant (KL) of 3.46 × 10−3 L·mg−1 and r2 value of 0.99. This result indicates that the YTBS residue was a good adsorbent for the removal of Cd(II) ion from aqueous system. View Full-Text
Keywords: cadmium; yam; heavy metal ion; kinetics; isotherm; surface area cadmium; yam; heavy metal ion; kinetics; isotherm; surface area
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Asuquo, E.D.; Martin, A.D.; Nzerem, P. Evaluation of Cd(II) Ion Removal from Aqueous Solution by a Low-Cost Adsorbent Prepared from White Yam (Dioscorea rotundata) Waste Using Batch Sorption. ChemEngineering 2018, 2, 35.

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