The reaction of synthetic Ca-5(PO4)(3)OH (HAP) with CU2+ ions is investigated by means of pH, pCu and pCa measurements as a function of the time, pH and electrolyte type (NaCl, NaHCO3, Na2HPO4). The solid phases separated after different reaction times are investigated with X-ray diffraction (XRD) and IR techniques. The Cu2+ does not form mixed compounds with Ca2+ and does not replace Ca2+ in the HAP structure. The presence, in an appropriate concentration, of anions which form very insoluble Cu2+ compounds favours the precipitation of the latter with no involvement of HAP. If the concentration of the anions is low, the precipitation of Cu2+ also involves HAP and this behaviour is particularly enhanced with Na2HPO4.
Effect of pH and anions on hydroxyapatite-Cu2+ solid-liquid interactions / Lusvardi, Gigliola; Menabue, Ledi; Saladini, Monica; M., Spaggiari. - In: JOURNAL OF MATERIALS CHEMISTRY. - ISSN 0959-9428. - ELETTRONICO. - 5(3):(1995), pp. 493-497.
Effect of pH and anions on hydroxyapatite-Cu2+ solid-liquid interactions
LUSVARDI, Gigliola;MENABUE, Ledi;SALADINI, Monica;
1995
Abstract
The reaction of synthetic Ca-5(PO4)(3)OH (HAP) with CU2+ ions is investigated by means of pH, pCu and pCa measurements as a function of the time, pH and electrolyte type (NaCl, NaHCO3, Na2HPO4). The solid phases separated after different reaction times are investigated with X-ray diffraction (XRD) and IR techniques. The Cu2+ does not form mixed compounds with Ca2+ and does not replace Ca2+ in the HAP structure. The presence, in an appropriate concentration, of anions which form very insoluble Cu2+ compounds favours the precipitation of the latter with no involvement of HAP. If the concentration of the anions is low, the precipitation of Cu2+ also involves HAP and this behaviour is particularly enhanced with Na2HPO4.
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