ISSN:
1573-4870
Keywords:
Mellita eduardobarrosoi
;
calcite skeleton
;
conversion
;
hydroxyapatite
;
boiling system
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The influence of the boiling solution technique (a nonhydrothermal wet treatment) in the formation of hydroxyapatite (HA) from a novel source, an echinoderm known as Mellita eduardobarrosoi, whose skeleton contains calcite as an inorganic constituent, was investigated. The experimental plan explores the conversion using a batch boiling system composed of KH2PO4 + KOH aqueous solutions at initial pH's of 8, 9, 10, 11, and 12, where granules of skeleton were dispersed to yield PO4/CaCO3 ratios of 1.0, 1.5, and 2.0. Chemical and X-ray diffraction analysis of the resulting material showed that the conversion of calcite by this technique is almost always higher than 70%, pH's 10 and 11 yielding the highest conversion. Depending on the operating conditions, the obtained material is a mixture of the original calcite and HA of varying stoichiometry and composition. Nevertheless, the interconnected porosity is preserved.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1021845325594
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