Removal of antimonate ions and simultaneous formation of a brandholzite-like compound from magnesium-aluminum oxide

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Abstract

Magnesium-aluminum oxide (Mg-Al oxide), obtained by thermal decomposition of a Mg-Al layered double hydroxide (Mg-Al LDH), was found to remove Sb(OH) 6 (Sb(V)) in solution because of rehydration, and to combine with Sb(V) to form a brandholzite-like structure. Although the Sb concentration decreased with increasing amounts of Mg-Al oxide, differences in the Mg/Al molar ratio had little effect on this relationship. The removal of Sb(V) in solution by Mg-Al oxide was partially prevented by coexistent anions with high charge densities (SO42- and CO32-). In this case, Mg-Al oxide likely rehydrates and competitively combines with Sb(V) in solution to construct a brandholzite-like structure or with anions to reconstruct the LDH structure. However, in the case of coexistent anions with low charge densities (Cl and OH), Mg-Al oxide likely rehydrates and preferentially combines with Sb(V) in solution to construct the brandholzite-like structure. A high concentration of Cl and SO2- 4 had little effect on the decrease in Sb concentration, whereas a high concentration of CO2-3 had a large effect.

Original languageEnglish
Pages (from-to)235-239
Number of pages5
JournalSeparation and Purification Technology
Volume80
Issue number2
DOIs
Publication statusPublished - 2011 Jul 29

Keywords

  • Antimonate
  • Brandholzite
  • Magnesium-aluminum oxide
  • Removal

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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