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KMID : 1024520000090040325
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Journal of the Environmental Sciences
2000 Volume.9 No. 4 p.325 ~ p.330
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The Removal of Heavy Metals in Aqueous Solution by Hydroxyapatite
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Kang Jeon-Tag
Jeong Gi-Ho
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Abstract
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The hydroxyapatite (HAp) for the present study was prepared by precipitation method in semiconductor fabrication and the crystallized at ambient to 95 for 30min in electric furnace. The ion-exchange characteristics of HAp for various heavy metal ions such as 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 follws: $Pb^{2+}, Fe^{3+}>Cu^{2+}>Zn^{2+}>Al^{3+}>Cd^{2+}>Mn^{2+}>Cr^{6+}. The Pb^{2+}$ ion was readily removed by the Hap, even in the strongly acidic region. The maximum amount of the ion-exchange equilibrium for ion was about 45 mg/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
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KEYWORD
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hydroxyapatite, ion exchange, heavy metals, removal, recycling
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