Adsorption of Cr(VI) and Se(IV) from their aqueous solutions onto Zr4+-substituted ZnAl/MgAl-layered double hydroxides: effect of Zr4+ substitution in the layer.

来自 dx.doi.org

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阅读量：

101

作者：

NN Das，J Konar，MK Mohanta，SC Srivastava

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摘要：

Hydrotalcite-like compounds (layered double hydroxides, LDHs) containing varying amounts of Al 3+, Zr 4+, and Zn 2+ or Mg 2+ in the metal hydroxide layer have been synthesized and characterized by various physicochemical methods. The adsorption behavior of uncalcined (as-synthesized) and calcined LDHs have been investigated for Cr 2O 7 2− and SeO 3 2−. The mixed oxides, obtained on calcination at 450 °C, exhibit high adsorption capacities for Cr 2O 7 2− (1.6–2.7 meq/g) and SeO 3 2− (1.1–1.5 meq/g), where adsorption occurs through rehydration. Substitution of Zr 4+ in the LDHs, for either M 2+ or Al 3+ ions, increases the adsorption capacity up to 20%, thus providing an alternative way to enhance the adsorption capacity of this type of material. The high adsorption capacity of these materials could be successfully used for removal of undesirable anions from water and also for synthesis of intercalated materials with tailored acidobasicity.

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关键词：

Layered double hydroxides Hydrotalcites Adsorption Hexavalent chromium Selenite

DOI：

10.1016/S0021-9797(03)00400-4

被引量：

246

年份：

2004