Abstract
The objectives of this study were to (i) synthesize layered double hydroxides (LDH) of Fe 2+ and Al 3+ containing sulfate ion in the interlayer space, and (ii) to evaluate the reduction of bromate in NaBrO 3 solution. The LDH was synthesized by co-precipitation method. The LDH was crystalline having a chemical formula [ Fe 2 + 0.67 Al 3 + 0.33 ( OH ) 2 ][(SO 4) 0.16·1.3H 2O]. The kinetic study showed that bromate was reduced from 100 μmol/dm 3 to less than 0.07 μmol/dm 3 by the LDH in 1 h. The concentration of bromide in the aqueous solution proportionally increased as bromate was reduced by Fe(II) of the LDH. After repeated use of the LDH in NaBrO 3 solution for bromate reduction (5th run), the LDH transferred to α-FeOOH and amorphous aluminum hydroxide because of oxidation of structural Fe(II) of the LDH.
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