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 language | English |
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Pages (from-to) | 1323-1328 |
Number of pages | 6 |
Journal | Fresenius Environmental Bulletin |
Volume | 21 |
Issue number | 5 A |
Publication status | Published - 2012 |
Keywords
- Anion exchang e
- Antimonate; removal
- Copper-aluminum layered double hydroxide
ASJC Scopus subject areas
- Environmental Chemistry
- Waste Management and Disposal
- Pollution