Removal of antimonate ions from aqueous solution using copper-aluminum layered double hydroxide

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4 Citations (Scopus)

Abstract

Copper-aluminum layered double hydroxide intercalated with NO3- (NO3·VCu-Al LDH) removed Sb(OH)6- [Sb(V)] in solution. The removal of antimony (Sb) increased with increasing NO 3Cu-Al LDH, regardless of reaction time. The pH increased from 4 to about 6, and then remained constant due to the buffering action of Cu 2+. The removal of Sb by NO3Cu-Al LDH occurred due to anion exchange between Sb(V) (i.e., Sb(OH)6- in aqueous solution) and NO3- in the interlayer of Cu-Al LDH. Some Sb(OH)6- was likely adsorbed on the surface of NO3·Cu-Al LDH. Conditions were difficult for intercalated OH- to contribute to anion exchange with Sb(OH)6-. The removal efficiency of Sb decreased as follows: NO3Cu-Al LDH >> Cl·Cu-Al LDH > CO3-CuAl LDH > SO4Cu-Al LDH, regardless of reaction time. C0 3Cu-Al LDH acted as an adsorbent for Sb(V) in aqueous solution. This reaction occurred around pH 6 when CO32- in the interlayer of Cu-Al LDH reacted with H+ to produce HCO3-. Therefore, HCO3-in the interlayer of Cu-Al LDH was exchanged with Sb(V) in aqueous solution. Among four types of Cu-Al LDHs, NO3·Cu-Al LDH was superior for the treatment of Sb(V).

Original languageEnglish
Pages (from-to)1323-1328
Number of pages6
JournalFresenius Environmental Bulletin
Volume21
Issue number5 A
Publication statusPublished - 2012

Keywords

  • Anion exchang e
  • Antimonate; removal
  • Copper-aluminum layered double hydroxide

ASJC Scopus subject areas

  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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