Abstract
Calcium hydroxyapatite (Ca10(PO4)6(OH)2: Hap) particles grafting of O-phosphoethanolamine (NH2(CH2)2 OPO3H2: PEA) were prepared by a coprecipitation method with a mixture of Ca(OH)2, H3PO4 and PEA at different PEA/(PEA+H3PO4) molar ratios in aqueous media at 85 °C. The crystallinity and particle size of Hap were decreased with an increase of PEA/(PEA+H3PO4) ratio, revealing that the crystal and particle growth of Hap were inhibited by grafting of PEA. The surface aminoethyl groups were generated by substituting the surface PO43- of Hap with PEA ions, giving rise to the decrease of surface P-OH groups of Hap. The number of surface aminoethyl groups was increased with increasing the PEA/(PEA+H3PO4) ratio and was ranged from 0.08 to 0.56 molecules/nm2. The surface aminoethyl groups would act as the irreversible adsorption sites of CO2.
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