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Removal of antimonate ions from an aqueous solution by anion exchange with magnesium–aluminum layered double hydroxide and the formation of a brandholzite-like structure
A magnesium–aluminum layered double hydroxide intercalated with NO3 − (NO3•Mg–Al LDH) removed Sb(V) in solution. The antimony (Sb) removal increased with time and with an increasing molar ratio of Al/Sb, i.e., the quantity of NO3•Mg–Al LDH. The removal of Sb(V) in solution by NO3•Mg–Al LDH was not due to the reaction of Sb(V) with dissolved Mg2+ but was rather caused by anion exchange between Sb(V), i.e., Sb(OH)6 −, in an aqueous solution and NO3 − in the interlayer of the Mg–Al LDH. The intercalation of Sb(OH)6 − in the interlayer of Mg–Al LDH is thought to result in the formation of a brandholzite-like structure. Some Sb(OH)6 − was likely adsorbed on the surface of the NO3•Mg–Al LDH. The efficiency of the Sb removal decreased in the following order, irrespective of the reaction time: NO3•Mg–Al LDH ≈ Cl•Mg–Al LDH > SO4•Mg–Al LDH > CO3•Mg–Al LDH. The removal of Sb by SO4•Mg–Al LDH and Cl•Mg–Al LDH was also caused by anion exchange between Sb(V), i.e., Sb(OH)6 −, in an aqueous solution and SO4 2− and Cl− in the interlayer of Mg–Al LDH, which formed a brandholzite-like structure due to the intercalation of Sb(OH)6 − into the interlayer. In the case of SO4•Mg–Al LDH, hydrogen bonds between the Mg–Al LDH-positive host layer and Sb(OH)6 − were probably stronger than the electrostatic force of attraction between the Mg–Al LDH-positive host layer and SO4 2−. The results suggested that Cl•Mg–Al LDH was as effective as NO3•Mg–Al LDH for the treatment of Sb(V) in aqueous solutions.
Removal of antimonate ions from an aqueous solution by anion exchange with magnesium–aluminum layered double hydroxide and the formation of a brandholzite-like structure
A magnesium–aluminum layered double hydroxide intercalated with NO3 − (NO3•Mg–Al LDH) removed Sb(V) in solution. The antimony (Sb) removal increased with time and with an increasing molar ratio of Al/Sb, i.e., the quantity of NO3•Mg–Al LDH. The removal of Sb(V) in solution by NO3•Mg–Al LDH was not due to the reaction of Sb(V) with dissolved Mg2+ but was rather caused by anion exchange between Sb(V), i.e., Sb(OH)6 −, in an aqueous solution and NO3 − in the interlayer of the Mg–Al LDH. The intercalation of Sb(OH)6 − in the interlayer of Mg–Al LDH is thought to result in the formation of a brandholzite-like structure. Some Sb(OH)6 − was likely adsorbed on the surface of the NO3•Mg–Al LDH. The efficiency of the Sb removal decreased in the following order, irrespective of the reaction time: NO3•Mg–Al LDH ≈ Cl•Mg–Al LDH > SO4•Mg–Al LDH > CO3•Mg–Al LDH. The removal of Sb by SO4•Mg–Al LDH and Cl•Mg–Al LDH was also caused by anion exchange between Sb(V), i.e., Sb(OH)6 −, in an aqueous solution and SO4 2− and Cl− in the interlayer of Mg–Al LDH, which formed a brandholzite-like structure due to the intercalation of Sb(OH)6 − into the interlayer. In the case of SO4•Mg–Al LDH, hydrogen bonds between the Mg–Al LDH-positive host layer and Sb(OH)6 − were probably stronger than the electrostatic force of attraction between the Mg–Al LDH-positive host layer and SO4 2−. The results suggested that Cl•Mg–Al LDH was as effective as NO3•Mg–Al LDH for the treatment of Sb(V) in aqueous solutions.
Removal of antimonate ions from an aqueous solution by anion exchange with magnesium–aluminum layered double hydroxide and the formation of a brandholzite-like structure
Kameda, Tomohito (author) / Nakamura, Mami (author) / Yoshioka, Toshiaki (author)
Journal of Environmental Science and Health, Part A ; 47 ; 1146-1151
2012-07-01
6 pages
Article (Journal)
Electronic Resource
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