Uptake of CrO42– Ions by Fe–Treated Tri–Calcium Phosphate
Juan Serrano–Gómez,* Jorge Luis Ramírez–Sandoval, Juan Bonifacio– Martínez, Francisco Granados–Correa and Verónica Elizabeth Badillo–Almaraz
Instituto Nacional de Investigaciones Nucleares. A. P. 18–1027. Col. Escandón, Delegación Miguel Hidalgo, México, D. F., México. Tel. 5329–7200, Ext. 2276, 2270. Fax: 5329–7301. *Responsible author: juan.serrano@inin.gob.mx.
Received November 23, 2009
Accepted March 23, 12, 2010
Abstract
CrO42– ion adsorption on Fe–treated tri–calcium phosphate was studied by batch experiments as a function of contact time, initial concentration of metal ion and temperature. Adsorption results showed that at pH 5.5 and 1.0×10–4 M chromium concentration the adsorption capacity of Fe–treated tri–calcium phosphate for CrO42– ions was 7.10 × 10–3 mmol/g. Chromium adsorption data on Fe–treated tri–calcium phosphate at various initial concentration fitted the Freundlich isotherm. By temperature studies the thermodynamic parameters ΔH0, ΔG0 and ΔS0 were estimated and the obtained results showed that the adsorption reaction was endothermic and spontaneous.
Keywords: Fe–treated tri–calcium phosphate, chromate ions, adsorption, isotherm, thermodynamics parameters.
Resumen
Por medio de experimentos estáticos se estudió la adsorción de iones CrO42– en fosfato tricálcico tratado con Fe, como una función del tiempo de contacto, concentración inicial y temperatura. Los resultados mostraron que a un pH de 5.5 y una concentración 1.0 × 10–4 M de cromo la capacidad de adsorción del fosfato tricálcico tratado con Fe para los iones cromato fue de 7.1 × 10–3 mmol/g. Los datos de adsorción del cromo en el adsorbente modificado con Fe, como una función de su concentración, se ajustaron a la isoterma de Freundlich. A través de estudios de temperatura se determinaron los parámetros termodinámicos ΔH0, ΔG0 y ΔS0 y los resultados obtenidos mostraron que el proceso de adsorción de los iones cromato es endotérmico y espontáneo.
Palabras clave: Fosfato tricálcico, Fe, cromatos, adsorción, isoterma, parámetros termodinámicos.
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]]>Acknowledgements
We acknowledge financial support from ININ project CB–904 and we thank Marcelino Villa, Juan Vidal, Benilde Manteca and Elvia Morales for technical support.
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