Environmental Biotechnology

Process Biotechnology

Electronic Journal of Biotechnology ISSN: 0717-3458 Vol. 9 No. 2, Issue of April 15, 2006
© 2006 by Pontificia Universidad Católica de Valparaíso -- Chile Received July 4, 2005 / Accepted October 17, 2005
DOI: 10.2225/vol9-issue2-fulltext-9  

Recovery of lead and cadmium ions from metal-loaded biomass of wild cocoyam (Caladium bicolor) using acidic, basic and neutral eluent solutions

Michael Horsfall Jnr*
Department of Pure and Industrial Chemistry
University of Port Harcourt
P. O. Box 402, Choba
Port Harcourt, Nigeria
Tel: 234 803 507 9595
E-mail: horsfalljnr@yahoo.com

Fred E. Ogban
Department of Chemistry
Delta State University
P. M. B 1, Abraka
Delta State, Nigeria
Tel: 234-8025434425

Eyetemi E. Akporhonor
Department of Chemistry
Delta State University
P. M. B 1, Abraka
Delta State, Nigeria
Tel: 234-8035501947

*Corresponding author

Financial support: This project was sponsored by International Foundation for Science (IFS) in collaboration with COMSTECH (The Committee on Scientific and Technological Cooperation of the Organization of Islamic Conference, Islamabad, Pakistan and INWERDAM (Inter-Islamic Network on Water Resources Development and Management, Amman, Jordania) through Grant No. W/3624-1 to Dr M. Horsfall Jnr.

Keywords: cocoyam, desorption, heavy metals removal, metal recovery, water treatment.

Abstract Reprint (PDF)

The effects of acidic, basic and neutral reagents on the recovery of Pb2+ and Cd2+ from metal-loaded biomass of wild cocoyam (C. bicolor) were investigated by eluting the biomass in five successive cycles using 0.01 M HCl, 0.1 M HCl, 0.01 M NaOH, 0.1 M NaOH and distilled water at different contact times. The data showed that the ease of metal ion recovery from metal -loaded biomass by the eluent solutions is of the order 0.01 M HCl > 0.1 M HCl > 0.01 M NaOH > 0.1 M NaOH > distilled water. Over 94% Pb2+ and 74% Cd2+ of the initially adsorbed metals were recovered by 0.01 M HCl, while < 20% of both metals was recovered by basic reagent. Distilled water recovered less than 9% of both metal ions from the biomass. Macroscopic changes were also observed as the concentration of recovery reagent increased. This study has demonstrated that the selection of a recovery reagent for metal ions on a biomaterial should give consideration to the reusability of the biomass.

Supported by UNESCO / MIRCEN network 
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