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pp.325-330
The hydroxyapatite (HAp) for the present study was prepared by precipitation method in semiconductor fabrication and the crystallized at ambient to950℃ for 30min in electric furnace. The ion-exchange characteristics of HAp for various heavy metal ions such as Cd2+, Cu2+, Mn2+, Zn2+, Fe3+, Pb2+, Al3+, and Cr6+ in aqueous solution has been investigated. The removal ratio of various metal ions for HAp were investigated with regard to reaction time, concentration of standard solution, amount of HAp and pH of solution. The order of the ions exchanged amount was as follows: Pb2+, Fe3+>Cu2+>Zn2+>Al3+>Cd2+>Mn2+>Cr6+. The Pb2+ ion was readily removed by the HAp, even in the strongly acidic region. The maximum amount of the ion-exchange equilibrium for Pb2+ ion was about 45 ㎎/gram of HAp. The HAp would seem to be possible agent for the removal of heavy metal ions in waste water by recycling of waste sludge in semiconductor fabrication.
