Heavy Metals Immobilization by Hydroxyapatite-Alginate Composite in Simulated Gastric Fluid

Abstract:

Article Preview

Micrometric sphere beads of HA-alginate composite were produced to remove Pb2+ and Cd2+ from contaminated gastric fluid. It was shown that the composite was effective in Pb2+ and Cd2+ immobilization from high-contaminated simulated gastric fluid. X-ray diffraction and scanning electron microscope analyses performed on HA-alginate beads after the Pb2+ uptake showed that lead phosphate, (Pb10-x Cax (PO4)6Cl2), was precipitated on beads surface. X-ray diffraction patterns of HA powder after Cd2+ sorption experiments showed no evidence of other phases, however, dispersive energy spectrometer analyses of the HA-alginate confirmed the presence of Cd2+ on the composite surface. Desorption experiments in simulated enteric fluid showed that composite beads containing Pb2+ and Cd2+ remained stables for one hour in simulated gastrointestinal fluid. The results reinforce the hypothesis that HA-alginate composite can be a very efficient system for Pb2+ and Cd2+ uptake from contaminated gastrointestinal fluid preventing systemic contamination by bloody stream uptake.

Info:

Periodical:

Key Engineering Materials (Volumes 361-363)

Main Theme:

Edited by:

Guy Daculsi and Pierre Layrolle

Pages:

467-470

Citation:

E. Mavropoulos et al., "Heavy Metals Immobilization by Hydroxyapatite-Alginate Composite in Simulated Gastric Fluid", Key Engineering Materials, Vols. 361-363, pp. 467-470, 2008

Online since:

November 2007

Export:

Price:

$38.00

[1] N. C. C. Rocha, R. C. Campos, A. M. Rossi, E. L. Barbosa and G. T. Moure: Environ Sci Technol. Vol. 36 (2002), p.630.

[2] E. Mavropoulos, A. M. Rossi, A. M. Costa, C. A. C. Perez and J. C. Moreira: Environ Sc. i Technol. Vol. 36 (2002), p.1625.

[3] P. V. Finotelli, M. A. Morales, M. H. Rocha-Leão, E. M. Baggio-Saitovitch and A. M. Rossi: Mater. Sci. Eng. Vol. 24 (2004), p.625.

[4] E. Mavropoulos, N. C. C. Rocha, J. C. Moreira, A. M. Rossi and G. A. Soares: Mater. Charact. Vol. 53 (2004), p.71.