Characterization of phase evolution during lead immobilization by synthetic hydroxyapatite

• Published in: Materials characterization Vol. 53; no. 1; pp. 71 - 78
• Main Authors: Mavropoulos, Elena, Rocha, Nilce C.C., Moreira, Josino C., Rossi, Alexandre M., Soares, Gloria A.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.09.2004; Elsevier Science
• Subjects: Applied sciences; AQUEOUS SOLUTIONS; CALCIUM PHOSPHATES; Cross-disciplinary physics: materials science; rheology; CRYSTALS; Electron microscopy; Environmental remediation; EVOLUTION; Exact sciences and technology; Hydroxyapatite; LEAD; LEAD IONS; Lead sorption; MATERIALS SCIENCE; Metals. Metallurgy; Nonmetallic coatings; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; POWDERS; Production techniques; REMEDIAL ACTION; SCANNING ELECTRON MICROSCOPY; SOILS; Solidification; SORPTION; Surface treatment; TRANSMISSION ELECTRON MICROSCOPY; WASTES; WATER; X-RAY DIFFRACTION; X-ray diffraction; Environmental remediation; Hydroxyapatite; Electron microscopy; Lead sorption; Surface treatments; Biomedical materials; Non metal coating
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2004.08.002

Immobilization of toxic metals by calcium phosphates is a promising technology for treating contaminated soil, water and wastes. A detailed study on the mechanisms of lead immobilization by hydroxyapatite has been carried out using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). For this, synthetic hydroxyapatite powder were submitted to a sorption process through exposure to an aqueous solution containing 917 mg L −1 of lead for times that varied from 3 min to 54 h. The results obtained reinforce the hypothesis that hydroxypyromorphite formation is the end of a kinetic process in which the hydroxyapatite crystals are continuously dissolved and recrystallized in order to form more stable structures with higher lead content. Consequently, the use of calcium phosphates to immobilize lead ions seems to be technically viable.