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Phosphate-intercalated CaFe-layered double hydroxides: Crystal structure, bonding character, and release kinetics of phosphate

Title
Phosphate-intercalated CaFe-layered double hydroxides: Crystal structure, bonding character, and release kinetics of phosphate
Authors
Woo M.A.Woo Kim T.Paek M.-J.Ha H.-W.Choy J.-H.Hwang S.-J.
Ewha Authors
최진호황성주
SCOPUS Author ID
최진호scopus; 황성주scopus
Issue Date
2011
Journal Title
Journal of Solid State Chemistry
ISSN
0022-4596JCR Link
Citation
vol. 184, no. 1, pp. 171 - 176
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The nitrate-form of CaFe-layered double hydroxide (CaFe-LDH) was synthesized via co-precipitation method, and its phosphate-intercalates were prepared by ion-exchange reaction. According to X-ray diffraction analysis, the CaFe-LDHNO 3 - compound and its H 2PO 4 --intercalate showed hexagonal layered structures, whereas the ion-exchange reaction with HPO 4 2- caused a frustration of the layer ordering of LDH. Fe K-edge X-ray absorption spectroscopy clearly demonstrated that the CaFe-LDH lattice with trivalent iron ions was well-maintained after the ion-exchange with HPO 4 2- and H 2PO 4 -. Under acidic conditions, phosphate ions were slowly released from the CaFe-LDH lattice and the simultaneous release of hydroxide caused the neutralization of acidic media. Fitting analysis based on kinetic models indicated a heterogeneous diffusion process of phosphates and a distinct dependence of release rate on the charge of phosphates. This study strongly suggested that CaFe-LDH is applicable as bifunctional vector for slow release of phosphate fertilizer and for the neutralization of acid soil. © 2010 Elsevier Inc. All rights reserved.
DOI
10.1016/j.jssc.2010.11.003
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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