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Environmental Engineering Research 2003;8(1): 22-30. DOI: https://doi.org/10.4491/eer.2003.8.1.022
SORPTION OF AQUEOUS TOXIC ANIONS ON CALCINED Mg/Al LAYERED DOUBLE HYDROXIDE: AN APPROACH TO MECHANISM
Mun Ja Kang1, Seog Woo Rhee2, and Pil Soo Hahn1
1Radioactive Waste Disposal Team, Korea Atomic Energy Research Institute, Daejeon 305-600, Korea
2Center for Biomedical Engineering, University of California, Irvine, CA 92697, USA
Corresponding Author: Mun Ja Kang ,Tel: +82-42-868-2078, Fax: +82-42-868-8850, Email: munkang@kaeri.re.kr
Received: August 6, 2002;  Accepted: November 6, 2002.
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ABSTRACT
In order to understand the sorption mechanism of Tc04" and Cr042" on calcined Mg/Al layered double hydroxide (LDH). spectroscopic identifications were performed. Calcined LDH and LDH sorbed with ReCV (Tc04" surrogate) or C1O42' were characterized by the powder X-ray diffraction, 27AI MAS NMR (Magic Angle Spinning Nuclear Magnetic Resonance), and FT-1R spectroscopies. The XRD pattern of LDH(Re04)2 shows the broad 006 reflection of 4.78 A. The NMR and FT-IR spectra reveal that the calcined LDH was reconstructed with intercalating Re04" in the aqueous RetV solution. In the previous study the sorption of Tc04~ and Re04' onto calcined LDH v/as proposed to be an ion-exchange reaction: generation of LDH hydroxide, Mg6Ab(OH)i8, as an intermediate and then replacement of the OH" by Tc04" or Re04" ions. In the present study it was identified by the XRD analysis of reaction solid of Re04" sorption that the LDH hydroxide is produced and exists in the reaction solid along with LDH(Re04);. This demonstrates that LDH hydroxide is the intermediate of the sorption process. In the case of Cr042" sorption on the calcined LDH, the LDH hydroxide is generated together with LDH(Cr04).
Keywords: CrO42- | layered double hydroxide | ReO4- | sorption | toxic anion
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