Synthesis and bromate reduction of sulfate intercalated Fe(II)–Al(III) layered double hydroxides

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• 作者：Ramesh Chitrakar ; ^a ; ^{chitrakar-ramesh@aist.go.jp"" rel=""nofollow} ; Akinari Sonoda ; ^a ; ^{a.sonoda@aist.go.jp"" rel=""nofollow} ; Yoji Makita^a ; Takahiro Hirotsu^a
• 关键词：Layered double hydroxides ; Reduction ; Bromate ; Bromide
• 刊名：Separation and Purification Technology
• 出版年：2011
• 出版时间：18 August 2011
• 年：2011
• 卷：80
• 期：3
• 页码：652-657
• 全文大小：500 K

文摘

The objectives of this study were to (i) synthesize layered double hydroxides (LDH) of Fe²⁺ and Al³⁺ containing sulfate ion in the interlayer space, and (ii) to evaluate the reduction of bromate in NaBrO₃ solution. The LDH was synthesized by co-precipitation method. The LDH was crystalline having a chemical formula [Fe²⁺_0.67Al³⁺_0.33(OH)₂Fe2+0.67Al3+0.33(OH)2][(SO₄)_0.16·1.3H₂O]. The kinetic study showed that bromate was reduced from 100 μmol/dm³ to less than 0.07 μmol/dm³ 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 NaBrO₃ 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.