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X-ray absorption spectroscopy studies for the determination of adsorption binding modes of selenium oxoanions onto iron and manganese based nanomaterials

Published online by Cambridge University Press:  04 February 2013

Christina M. Gonzalez ,
Jason G. Parsons ,
Jeffrey Hernandez  and
Jorge L. Gardea-Torresdey
Christina M. Gonzalez
Affiliation:
Department of Chemistry and Environmental Science and Engineering PhD program, The University of Texas at El Paso; 500 W University Ave., El Paso TX 79968, United States
Jason G. Parsons
Affiliation:
Department of Chemistry, The University of Texas-Pan American 1201 W University Drive, Edinburg TX 78534, United States
Jeffrey Hernandez
Affiliation:
Department of Chemistry and Environmental Science and Engineering PhD program, The University of Texas at El Paso; 500 W University Ave., El Paso TX 79968, United States
Jorge L. Gardea-Torresdey*
Affiliation:
Department of Chemistry and Environmental Science and Engineering PhD program, The University of Texas at El Paso; 500 W University Ave., El Paso TX 79968, United States Environmental Science and Engineering PhD program, The University of Texas at El Paso; 500 W University Ave., El Paso TX 79968, United States
*
*Email: [email protected]
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Abstract

Increasing concentrations of selenium oxoanions in the environment are placing many animals at risk for reproduction failure and deformities. The understanding of binding mechanisms of selenium oxoanions to iron and manganese based oxide minerals could lead to enhanced understanding of selenium mobility in the environment. In this study, the binding mechanisms of selenium oxoanions, selenite and selenate, to non microwave-assisted and microwave-assisted synthetic Fe3O4, Mn3O4, and MnFe2O4 nanomaterials were investigated through the use of X-ray absorption spectroscopy. The X-ray absorption near-edge structure (XANES) spectroscopy studies revealed the oxidation state of selenite and selenate remains the same after binding occurs to all nanomaterials in pH 2, 4, or 6 environments. The binding modes of selenite and selenate were determined to be bidentate binuclear through use of Extended x-ray absorption fine structure (EXAFS) and were independent of nanomaterials, synthetic technique, and pH.

Keywords

Senanostructureadsorption
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1480: Symposium S – Novel Characterization Methods for Biological Systems , 2012 , imrc12-1480-s2b-0016
Copyright
Copyright © Materials Research Society 2012 

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