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1. Removal of cadmium from contaminated waters using saltbush (Atriplex canescens) biomass: identification of Cd binding sites

Author

Jose R. Peralta-Videa, Jorge L. Gardea-Torresdey, Jason G. Parsons, J.H. Gonzalez, and Maather F. Sawalha

Subjects
Cadmium, biology, Chemistry, Ligand, chemistry.chemical_element, Biomass, Management, Monitoring, Policy and Law, biology.organism_classification, Pollution, Oxygen, Metal, Hydrolysis, visual_art, Botany, visual_art.visual_art_medium, Atriplex canescens, Binding site, Waste Management and Disposal, Nuclear chemistry
Abstract

The effect of pH on Cd(II) binding capacity of saltbush biomass was determined. Metal quantification performed using ICP/OES showed that Cd binding increased as pH increased from 2.0 to 5.0. The highest percentage of Cd bound ranged from 74-81%, 22-40%, and 70-80% for the native, esterified, and hydrolysed biomass. XAS studies showed that cadmium was present as Cd(II) and oxygen was the nearest neighbouring atom with bond lengths of approximately 2.3 A and coordination numbers ranging between 4 and 5. Results indicated that carboxyl groups may be the primary ligand involved in the Cd binding by saltbush biomass.

Published
2008

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