Paper Titles
Characterization and Applications of Calcium Ferrites Based Materials Containing Active Oxygen Species
p.2169
Environmental Aspects on the Use of Bayer's Process Bauxite Residue in the Production of Ceramics
p.2176
Environmental Applications of the Reactive Titania Coatings Elaborated by Suspension Plasma Spraying
p.2182
Structured Catalysts for Environmental and Energetical Applications
p.2188
Sol-Gel-Derived Hydroxyapatite and its Application to Sorption of Heavy Metals
p.2198
Development of Platy Alumina and its Application
p.2204
Improving the Properties of Low Temperature Sintered Alumina Bodies with Granite Reject Additions
p.2212
Properties of Wastes-Based Extruded Ceramics Formulations
p.2218
A Study of Porous Slag with Plasma Arc Melting
p.2224

Sol-Gel-Derived Hydroxyapatite and its Application to Sorption of Heavy Metals

Article Preview

Abstract:

Hydroxyapatite (HA) microspheres of diameter <70 μm have been synthesized by solgel processing. The starting sols were prepared by ultrasonic mixing of concentrated solutions of calcium acetate (1.7M) with 85% H3PO4, followed by emulsification in dehydrated 2-ethyl-1- hexanol. Drops of emulsion were solidified by extraction of water with this solvent. The final thermal treatment was a 2 h soaking in air at 900°C. Properties such as hydraulic resistance and sedimentation rate, which are important for application in ion-exchangers, were superior for our prepared microspheres in comparison with irregularly shaped commercial HA. Adsorption of the following metals was investigated: U, Zn, Fe, Cu, Ni, Co, Cd, Pb, Mn, Al, Cr, As, Sb, Bi and Mo. Retention was ≈100% for of all the metals studied when pH > 3–4. On average, ≈1/20 moles of metal reacted with 1 mole of HA. Adsorbed metals could be desorbed with efficiencies of 60–90%. In addition, nuclear-waste-saturated beds of HA could be transformed to insoluble ceramics by thermal treatment. The cost of producing HA microspheres was estimated to be comparable to current prices of irregularly shaped commercial hydroxyapatite powders. For radioactive contaminants such as U, for which resorption need not be considered, porous monoliths were produced by use of industrial reagents. The retention capacity was determined to be 30 mg of U per 1 mg of monolith.

You might also be interested in these eBooks
11th International Ceramics Congress View Preview

Info:

Periodical:

Advances in Science and Technology (Volume 45)

Pages:

2198-2203

DOI:

https://doi.org/10.4028/www.scientific.net/AST.45.2198

Citation:

Cite this paper

Online since:

October 2006

Authors:

A. Deptuła, J. Chwastowska, Wiesława Łada, T. Olczak, D. Wawszczak, E. Sterlinska, B. Sartowska, K.C. Goretta

Keywords:

Adsorption, Hydroxyapatite (HAP), Sol-Gel (SG), Solubility, Synthesis

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] T. Suzuki, T. Hatsushika and Y. Hayakawa: J. Chem. Soc. Faraday Trans. Vol. 77 (1981), p.1059.

Google Scholar

[2] T. Suzuki, T. Hatsushika and M. Miyake: ibid., Vol. 78 (1982), p.3605.

Google Scholar

[3] T. Suzuki, K. Ishigaki and M. Miyake: ibid., Vol. 80 (1984), p.3157.

Google Scholar

[4] J. Reichert and J.G.P. Binner: J. Mater. Sci. Vol. 31 (1996), p.1231.

Google Scholar

[5] J. Jeanjean, M. Fedoroff, F. Faverjon, U. Vincent and J. Corset: ibid., Vol. 31 (1996), p.6156.

Google Scholar

[6] J. Jeanjean, U. Vincent and M. Fedoroff: Solid State Chem. Vol. 108 (1994), p.68.

Google Scholar

[7] G. Wright: Ann. Chim. Fr. Vol. 5 (1970), p.39.

Google Scholar

[8] R.A. Young: in Proceedings of the 2 nd International Congress on Phosphorus Compounds, (IMPHOS, Paris, 1980), p.73.

Google Scholar

[9] D. Singh, A.S. Wagh, J. Cunnane and J. Mayberry: J. Environ. Sci. Health Vol. A32 (1997), p.527.

Google Scholar

[10] D. Singh, M. de la Cinta Lorenzo-Martin, J.L. Routbort, F. Gutiérrez-Mora and E.D. Case: Int. J. Appl. Ceram. Technol. Vol. 2 (2005), p.247.

Google Scholar

[11] K.C. Goretta, D. Singh, M. Tlustochowicz, M.M. Cuber, M.L. Burdt, S.Y. Jeong, T.L. Smith, A.S. Wagh and J.L. Routbort: Mater. Res. Soc. Proc. Vol. 556 (1999), p.1253.

DOI: 10.1557/proc-556-1253

Google Scholar

[13] C. Alvani, A. Borello, A. Deptula, L. Lorenzini and L. Orru': Method for preparing of irregularly shaped and spherical powders of calcium phosphates, especially Cahydroxyapatite, Italian Patent 01245400 (1994).

Google Scholar

[14] A. Deptuła, W. Łada, T. Olczak, A. Borello, C. Alvani and A. Di Bartolomeo: J. NonCrystall. Sol. Vol. 147&148 (1992), p.537.

DOI: 10.1016/s0022-3093(05)80672-6

Google Scholar

[15] A. Deptuła, W. Łada, T. Olczak, M.T. Lanagan, S.E. Dorris, K.C. Goretta and R.B. Poeppel: Method for preparing of high temperature superconductors, Polish Patent 172618 (1997).

Google Scholar

[16] A. Deptuła, W. Łada, T. Olczak, B. Sartowska, R.Z. LeGeros and J.P. LeGeros: in Bioceramics 11, ed. R.Z. LeGeros and J.P. LeGeros (World Scientific, Singapore, 1998), p.743.

DOI: 10.1142/9789814527842

Google Scholar

[17] A. Deptula, A.G. Chmielewski and T.E. Wood: in 9th CIMTEC Proceedings, Part D, ed. P. Vincenzini (Techna, Faenza, 1999), p.771.

Google Scholar

[18] R.M.H. Verbeek, H. Steyaer, H.P. Thun and F. Verbeek: J. Chem. Soc. Faraday Trans. Vol. 76 (1980), p.209.

DOI: 10.1039/f19807600209

Google Scholar

[19] Y. Xu, F. Schwartz and S.J. Traina: Environ. Sci. Technol. Vol. 28 (1994), p.1472.

Google Scholar