The current density of hydroxyapatite electrosynthesis by ion exchange resin chambers

Abstract

Abstract. Electrochemical method has been developed to produce hydroxyapatite (HA) powders. Synthesis of hydroxyapatite particles was carried out from a homogeneous solution. The homogeneous solution was contained of Na2H2EDTA.2H2O, KH2PO4 and CaCl2 on 0.25/0.25/0.15 M. Water reduction at cathode to form OH -ion is very substantial in formation of hydroxyapatite. The OH -ions causes the release of Ca 2+ ions and change the equilibrium phosphate for the formation reaction of HA. The problem of electrochemical method is OH -ions move away from the cathode due to the difference in charge. This condition decrease the productivity of the formation of HA because OH -ions react with H + to form H2O. In this work, we develop new method electrosynthesis of HA with 2 chambers system. The electrolysis use ion exchange resin to separate the OH -ions and H + ions formed. The effect of current density to HA product was studied. HA product analysed with XRD. We conclude that the electrosynthesis hydroxyapatite with ion exchange resin more effective than without ion exchange resin. The higher current density, the more pure HA formed.