Uranium Sorption on "Tezontle" Volcanic Rock
Beatriz Eugenia López Muñoz,* Juana María Durán Blanco, José Luis Iturbe García, and María Teresa Olguín Gutiérrez
Instituto Nacional de Investigaciones Nucleares, Departamento de Química. Carretera México Toluca S/N, La Marquesa, Ocoyoacac, México, C.P. 52750, México. *Responsible author: beatriz.lopez@inin.gob.mx
Received July 1, 2009
Accepted January 26, 2010
Abstract
It is described a study that demonstrates that hexavalent uranium ions were sorbed by the naturally occurring mineral using a batch technique. This mineral is found in abundant quantities in Mexico. Our study focused on the separation of UVI from synthetic aqueous systems of both H2O–UO2(NO3)2.6H2O (acid) and H2O–Na4[UO2(CO3)3] (basic). The chemical speciation was performed by using high voltage electrophoresis, and the uranium content was determined by UV–Vis Spectroscopy. The quantified U(VI) sorption by tezontle from acidic and basic systems was 2.72 and 1.68 µmol/g, respectively, and the sorption behavior is discussed considering the surface charge of the tezontle at different pH values based on the point of zero charge characteristic of this material.
Key words: Uranium, Sorption, Tezontle, Electrophoresis.
Resumen
En este trabajo se demostró que los iones de uranio hexavalente son adsorbidos por el tezontle (roca de origen volcánico proveniente de México), utilizando un procedimiento por lotes. Este estudio se enfoca en la separación de uranio(VI) a partir de sistemas acuosos sintéticos de la forma ácida H2O–UO2(NO3)2.6H2O así como básica H2O–Na4[UO2(CO3)3]. La especiación química se realizó utilizando la técnica de electroforesis de alto voltaje. El contenido de uranio se determinó por espectroscopia de UV–Vis. La adsorción del U(VI) por el tezontle a partir de sistemas ácidos y básicos fueron de 2.72 y 1.68 µmol/g, respectivamente. El comportamiento de la adsorción del U(VI) por el tezontle, se discutió considerando la carga superficial del tezontle a diferentes valores de pH con base en el punto de carga cero característico del material.
Palabras clave: Uranio, adsorción, tezontle, electroforesis.
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]]>Acknowledgements
The authors acknowledge to Elvia Morales Moreno for technical support.
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