Surface and Physicochemical Characterization of Phosphates Vivianite, Fe₂(PO₄)₃ and Hydroxyapatite, Ca₅(PO₄)₃OH

D. Luna-Zaragoza, E. T. Romero-Guzmán, L. R. Reyes-Gutiérrez

Centro de Investigaciones en Ciencias de la Tierra. Universidad Autónoma del Estado de Hidalgo. Carretera Pachuca–Tulancingo Km. 4.5, Col. Carboneras. Pachuca de Soto. C.P. 42184, Hidalgo, México...
Departamento de Química, Gerencia de Ciencias Básicas. Instituto Nacional de Investigaciones Nucleares. Carretera México-Toluca km 36.5. C.P. 52045. A.P. 18–1027. México..

DOI: 10.4236/jmmce.2009.88052                

Abstract

Hydroxyapatite is a calcium phosphate in the apatite group. It has numerous applications due to its particular properties including the sorption of metallic ions. This makes it useful for the treatment of contaminated groundwater and for soil decontamination. The least expensive source of hydroxyapatite for synthesis is bovine bone, since this is a waste material. Vivianite is an iron phosphate which has received little study. Like hydroxyapatite, it has particular properties. This paper describes the method of obtaining these phosphates; calcium phosphate from bovine bone, and iron phosphate by synthesis. Also described are the methods of purifying the materials and characterization of these two phosphates by X-ray diffraction, infrared analysis, thermogravimetric and differential scanning calorimetric analysis, scanning electron microscopy, and surface area by the BET method. Physicochemical characteristics of hydroxyapatite obtained from bovine bone are described, and preliminary results are presented of an investigation into whether hydroxyapatite and iron phosphate are suitable as a permeable reactive barrier for the treatment of metallic and radionuclide contaminants.

Keywords

Phosphates, surface, site density, mass titration

Conflicts of Interest

The authors declare no conflicts of interest.

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