Removal of Cadmium from Contaminated Waters Using Saltbush (Atriplex Canescens) Biomass: Identification of Cd Binding Sites

Journal Title, Volume, Page:

International Journal of Environment and Pollution, Volume 34, Pages 28-42

Year of Publication:

2008

Link:

http://inderscience.metapress.com/content/8381j038543013qk

Authors:

Maather F. Sawalha

Environmental Science and Engineering PhD Program, University of Texas at El Paso, El Paso, 79968 TX, USA

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Jose R. Peralta-Videa

Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Jason G. Parsons

Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Jorge H. Gonzalez

Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Jorge L. Gardea-Torresdey

Environmental Science and Engineering PhD Program, and Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Preferred Abstract (Original):

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 Å 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.

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Removal of Cadmium from Contaminated Waters Using Saltbush (Atriplex Canescens) Biomass: Identification of Cd Binding Sites