層状複水酸化物の合成とその機能性材料への応用

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タイトル別名
  • Syntheses of layered double hydroxides and their application to functional materials
  • 日本鉱物科学会応用鉱物科学賞第11回受賞者 受賞記念研究紹介 層状複水酸化物の合成とその機能性材料への応用
  • ニホン コウブツ カガクカイ オウヨウ コウブツ カガクショウ ダイ11カイ ジュショウシャ ジュショウ キネン ケンキュウ ショウカイ ソウジョウフクスイサンカブツ ノ ゴウセイ ト ソノ キノウセイ ザイリョウ エ ノ オウヨウ

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<p>Layered double hydroxides (LDHs) have attracted considerable attention because of their extremely high anion-exchange capacities and diversity of composition. In this paper, we described the following research topics related to applications of LDHs. (1) We focused on surface complexation reactions on the synthetic LDH surfaces, and the effects of complexation reactions on the solid state properties of LDH were also evaluated. The results indicated that oxyanions with low ionic potential, such as AsO4 and PO4, had a tendency to form inner-sphere complexes with the LDH surfaces. The formation of inner-sphere complexes shifted the isoelectric point and the surface charge of the LDH. Furthermore, the solubility of the LDH was reduced by the inner-sphere complexes with PO4 and AsO4. (2) The synthesis of Zn-FeIII LDH was attempted, employing different pathways using either FeII or FeIII species together with Zn as the initial reagents. The product derived from the synthesis employing FeII was found to transition to a Zn-FeIII LDH phase following oxidation process. In contrast, the product obtained with FeIII did not contain a LDH phase. And the syntheses of Mg-FeIII LDH with different compositions at varied temperature were also attempted. The well-crystallized and white colored LDH were obtained. The synthesized Mg-FeIII LDH was treated with melted sugar alcohol in order to reduce FeIII. The Mg-Fe LDH resulting from a sugar alcohol treatment showed the reduction property in an aqueous solution. (3) The behavior of synthetic Zn-Al LDH in photo-induced degradation of an anionic dye was evaluated by determining the ultraviolet-visible absorption spectra under ultraviolet light irradiation. Zn-Al LDH showed photocatalytic activity toward various anionic dyes, and degradations of anionic dyes were accelerated without stabilization under ultraviolet irradiation. Zn-Al LDH should be useful as efficient photocatalysts for harmful organic anions.</p>

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  • 岩石鉱物科学

    岩石鉱物科学 48 (1), 46-50, 2019

    一般社団法人　日本鉱物科学会

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