HR: 09:00h
AN: U51C-04    [Abstracts]
TI: Removal of Toxic Metals and Radionuclides from Soils and Waters Using Nanosize Hydroxyapatite
AU: * Kim, C
EM: cwkim@rock25t.kigam.re.kr
AF: Korea Institute of Geoscience & Mineral Resources (KIGAM), 30 Gajeong-dong, Yuseong- gu, Daejeon, 305-350, Korea, Republic of
AU: Park, S
AF: Korea Institute of Geoscience & Mineral Resources (KIGAM), 30 Gajeong-dong, Yuseong- gu, Daejeon, 305-350, Korea, Republic of
AU: Day, D E
AF: University of Missouri-Rolla, Materials Research Center, Rolla, MO 65409, United States
AB: Many inorganic and organic ion filters or media have been investigated as potential candidates for removing the hazardous ions from contaminated water solutions but the processing costs, including manufacture of the filters, are high. Furthermore, the problem of permanently disposing of the "spent (used)" ion filters (which contain the radionuclides) remains an unsolved problem. One material that could satisfy this need is hydroxyapatite (HA), the mineral component in human bone. High surface area (> 150 m²/g) HA particles were prepared by a unique and innovative method that consists of reacting (24 hours at 37°C) particles (45-75 μm) of a calcium borate glass with an aqueous solution containing phosphate ions. The effectiveness of this HA in removing the radionuclides and the hazardous metals from contaminated water was determined by chemically analyzing the feed and effluent solutions using an inductively coupled plasma-mass spectrometer (ICP-MS). The ion removal effectiveness was not affected by the filtration methods, batch or column, and very high (e.g., K_d = 2×10⁶ mL/g for U) ion removal was achieved for the ions tested. Calcium phosphate powder generated from industrial by-products was also tested for the ion removal as an attractive source of HA.
DE: 0400 BIOGEOSCIENCES
DE: 1000 GEOCHEMISTRY
DE: 1800 HYDROLOGY
DE: 3600 MINERALOGY AND PETROLOGY
SC: Union [U]
MN: 2007 Joint Assembly