Studies on selective adsorbents for oxo-anions. Nitrate ion-exchange properties of layered double hydroxides with different metal atoms

DOI Web Site 被引用文献8件

書誌事項

公開日
2004
DOI
  • 10.1039/b314938m
公開者
Royal Society of Chemistry (RSC)

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説明

Layered double hydroxides (LDHs) with different kinds of metal ions (Mg–Al, Co–Fe, Ni–Fe, and Mg–Fe) in the brucite layers were prepared and their anion exchange properties were studied by measurements of distribution coefficient (Kd) and ion exchange capacity. The basal spacing of LDHs varied depending on the kind of metal ions in the brucite layer. A relatively high Kd value for NO3− ions was observed on Ni–Fe type LDHs, and a markedly high Kd value for the hydrothermally-treated Ni–Fe type LDHs (Ni–Fe (HT)), prepared at 120 °C. These high Kd values correlated with the basal spacing of 0.81 nm observed for this sample, where the interlayer distance (0.33 nm) is suitable for the stable fixing of NO3− ions (ionic size = 0.33 nm). A chemical analysis study showed a Cl−/NO3− ion-exchange mechanism for NO3− adsorption on Ni–Fe (HT). The NO3− uptake by Ni–Fe (HT) was nearly constant (NO3/Fe = 0.7) over a pH range between 5 and 10, which also supports the adsorption mechanism of Cl−/NO3− ion exchange. The Ni–Fe (HT) could remove NO3− ions from seawater effectively (NO3− uptake = 168 μmol g−1) even though seawater contains an extremely large amount of coexisting anions. This novel adsorbent thus has a NO3− ion-sieve property and will prove beneficial for the selective removal of NO3− ions from industrial effluents and seawater to clean the environment.

収録刊行物

  • Green Chemistry

    Green Chemistry 6 (2), 104-, 2004

    Royal Society of Chemistry (RSC)

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