Some physico-chemical aspects of hydroxylapatite

Narasaraju, T. S. B.; Phebe, D. E.

doi:10.1007/bf00355120

Cited by 445 publications

(296 citation statements)

References 176 publications

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“…It is also a major inorganic constituent of bones and teeth (Narasaraju and Phebe 1996). Its sorption properties are of great importance for environmental processes and various industrial purposes including fertilizer production, water purification and fabrication of biocompatible ceramics.…”

Section: Introductionmentioning

confidence: 99%

Study of sorption processes of strontium on the synthetic hydroxyapatite

Janusz

Skwarek

2016

Adsorption

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Adsorption of 90 Sr on hydroxyapatite is important in many fields of life. The aim of the paper was to discuss the changes in the double electrical layer at the hydroxyapatite/electrolyte solution interface during Sr ions adsorption and to establish the relations between time and adsorption on this material. Hydroxyapatite was prepared by the wet method, characterized by the X-ray diffraction and accelerated surface area and porosimetry methods. Studies of adsorption were carried out using 90 Sr isotopes and ionic solutions containing this ion depending on concentration and pH of the solution. Sr adsorption isotherms on hydroxyapatite were determined and the effect of strontium ions presence on the surface charge density and zeta potential was discussed.

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Section: Introductionmentioning

confidence: 99%

Study of sorption processes of strontium on the synthetic hydroxyapatite

Janusz

Skwarek

2016

Adsorption

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“…For both apatites the amount of released phosphate was the highest for the initial pH 3. This confirms that the apatite solubility increases with decreasing pH (Chien et al 1975, Arends et al 1987, Narasaraju et al 1971, Narasaraju & Phebe 1996. The higher solubility of the HAP as compared to the FAP is caused by the difference in solubility products (K SP ) of the minerals which are equal to 10 -58.23 and 10 -59.56 , respectively (Lindsay 1979).…”

Section: Apatites Dissolutionmentioning

confidence: 72%

Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Matusik¹,

Bajda²,

Manecki³

2012

geol

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Reducing the bioavailability of toxic heavy metals in groundwaters and urban soils by phosphate addition is an effective technique described in the literature. It is based on the reaction between metal ions and phosphates and results in the precipitation of metal substituted phosphate phases. The formed phosphates are highly insoluble and thermodynamically stable over almost entire pH and Eh range. In the presented study the efficiency and mechanism of cadmium uptake by synthetic hydroxylapatite and natural fluoroapatite was examined within the pH range of 3 7 for different reaction times (2 1440 hours). The solids after reactions were characterized by XRD and SEM-EDS. Percentage reduction of cadmium concentration in the experiments with fluoroapatite and hydroxylapatite, regardless of pH, did not exceed 17% and 25%, respectively. Cadmium uptake from the solution mainly resulted from the formation of cadmium phosphates and/or Ca-Cd phosphate solid solutions on the apatites surface. The release rate of phosphate ions by hydroxylapatite was relatively high. This promoted crystallization of a large number of small crystals. In turn dissolution of fluoroapatite was slower and thus the formation of large crystals was observed. There was no clear evidence for cadmium-calcium ion-exchange mechanism.

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“…The characteristic HAp peaks were present; the peak at around 600 cm −1 originated from the vibrational mode of the hydroxyl group [47], and the peaks around 1020, 970, 560 and 520 cm −1 were assigned to the internal modes of the phosphate group. It was assumed that the small peaks around 1430 and 870 cm −1 originated from a small amount of carbonate [48]. Furthermore, determination of the Ca and phosphate ion content showed that the Ca/P ratio of the deposited HAp was 1.34.…”

Section: Effect Of Immobilized Glutamic Acid On Cap Depositionmentioning

confidence: 99%

Preparation and biological evaluation of hydroxyapatite-coated nickel-free high-nitrogen stainless steel

Sasaki

Inoue

Katada

et al. 2012

Science and Technology of Advanced Materials

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Calcium phosphate was formed on nickel-free high-nitrogen stainless steel (HNS) by chemical solution deposition. The calcium phosphate deposition was enhanced by glutamic acid covalently immobilized on the surface of HNS with trisuccinimidyl citrate as a linker. X-ray diffraction patterns and Fourier transform infrared spectra showed that the material deposited on glutamic acid-immobilized HNS within 24 h was low-crystallinity calcium-deficient carbonate-containing hydroxyapatite (HAp). The biological activity of the resulting HAp-coated HNS was investigated by using a human osteoblast-like MG-63 cell culture. The HAp-coated HNS stimulated the alkaline-phosphate activity of the MG-63 culture after 7 days. Therefore, HAp-coated HNS is suitable for orthopedic devices and soft tissue adhesion materials.

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Some physico-chemical aspects of hydroxylapatite

Cited by 445 publications

References 176 publications

Study of sorption processes of strontium on the synthetic hydroxyapatite

Study of sorption processes of strontium on the synthetic hydroxyapatite

Aqueous cadmium removal by hydroxylapatite and fluoroapatite

Preparation and biological evaluation of hydroxyapatite-coated nickel-free high-nitrogen stainless steel

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