Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
Volume 47, Issue 8, Pages 1146-1151Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10934529.2012.668121
Keywords
Magnesium-aluminum layered double hydroxide; anion exchange; antimonate; removal; brandholzite
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A magnesium-aluminum layered double hydroxide intercalated with NO3- (NO3 center dot 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 center dot Mg-Al LDH. The removal of Sb(V) in solution by NO3 center dot 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 center dot Mg-Al LDH. The efficiency of the Sb removal decreased in the following order, irrespective of the reaction time: NO3 center dot Mg-Al LDH approximate to Cl center dot Mg-Al LDH > SO4 center dot Mg-Al LDH > CO3 center dot Mg-Al LDH. The removal of Sb by SO4 center dot Mg-Al LDH and Cl center dot Mg-Al LDH was also caused by anion exchange between Sb(V), i.e., Sb(OH)(6)(-), in an aqueous solution and SO42- 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 center dot 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 SO42-. The results suggested that Cl center dot Mg-Al LDH was as effective as NO3 center dot Mg-Al LDH for the treatment of Sb(V) in aqueous solutions.
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