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THE REMOVAL OF HEAVY METALS USING HYDROXYAPATITE
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  • Journal title : Environmental Engineering Research
  • Volume 10, Issue 5,  2005, pp.205-212
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2005.10.5.205
 Title & Authors
THE REMOVAL OF HEAVY METALS USING HYDROXYAPATITE
Lee, Chan-Ki; Kim, Hae-Suk; Kwon, Jae-Hyuk;
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 Abstract
The study was conducted to investigate the removal of heavy metals by using Hydroxyapatite(HAp) made from waste oyster shells and wastewater with high concentration of phosphorus. The maximum calcium concentration for the production of HAp in this study was released up to 361 mg/L at pH of 3 by elution experiments. When the pH was at adjusted 6, the maximum calcium released concentration was 41 mg/L. During the elution experiment, most of the calcium was released within 60 minutes. This reaction occurred at both pH levels of 3 and 6. The result of the XRD analysis for the HAp product used in this study shows the main constituent was HAp, as well as OCP. The pH was 8.6. As the temperature increased, the main constituent did not vary, however its structure was crystallized. When the pH was maintained at 3, the removal efficiency decreased as the heavy metal concentration increased. The order of removal efficiency was as follows: (92%), (92%) > (20%) > (0%). Most of these products were dissolved and did not produce sludge in the course of heavy metals removal. As the heavy metal concentration increased at pH of 6, the removal efficiency increased. The removal efficiencies in all heavy metals were over 80%. From the analysis of the sludge after reaction with heavy metals, the HAp was detected and the OCP peak was not observed. Moreover, lead ion was observed at the peaks of lead-Apatite and lead oxidant. In the case of cadmium, copper and iron ions, hydroxide forms of each ion were also detected.
 Keywords
Oyster shells;HAp(Hydroxyapatite);XRD;OCP(Octa-Calcium Phosphate);heavy metals removal;
 Language
English
 Cited by
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