表面酸性官能基の有無が活性炭の鉛イオン吸着におよぼす影響 Influence of Acidic Surface Factional Groups on Lead(II) ions Adsorption by Activated Carbons

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Influence of solution temperature and acidic surface factional groups on lead(II) ions adsorption onto activated carbons (ACs) were studied. ACs with no surface oxygen, OG-ACs were made by heating at 1273 K under helium flow, and those introduced acidic surface factional groups were prepared with nitric acid, Ox-ACs. The amount of proton released from carbon was measured after the lead(II) ions adsorption was completed. Adsorption of lead(II) ions onto OG-ACs were caused by electrostatic interaction between Cπ electrons on the graphene layer and lead(II) ions, whereas the adsorption onto Ox-ACs were took place by ion exchange. The thermodynamic parameters such as Gibbs free energy change (Δ<I>G</I><SUP>0</SUP>), enthalpy change (Δ<I>H</I><SUP>0</SUP>), and entropy change (Δ<I>S</I><SUP>0</SUP>) were calculated from van′t Hoff plots. Adsorption onto OG-ACs resulted in spontaneous and exothermal process. Though the adsorption by Ox-ACs was also spontaneous from Δ<I>G</I><SUP>0</SUP>, the Δ<I>H</I><SUP>0</SUP> was nearly equal to zero because temperature dependence could not be observed for the adsorption onto oxidized carbons. The adsorption kinetics was examined using the Langmuir type rate equation, indicating that adsorption rate constants were greater for Ox-ACs than for OG-ACs. The adsorption kinetic constants were significantly enhanced with increasing solution temperature and/or decreasing in particle size, revealing that the rate determining step of adsorption onto Ox-ACs could be effectively shifted from inter-particle diffusion to collision between adsorbate and adsorption sites.

収録刊行物

  • 環境化学 : journal of environmental chemistry

    環境化学 : journal of environmental chemistry 18(2), 219-226, 2008-06-24

    Japan Society for Environmental Chemistry

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各種コード

  • NII論文ID(NAID)
    10021084968
  • NII書誌ID(NCID)
    AN10547099
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09172408
  • NDL 記事登録ID
    9554599
  • NDL 雑誌分類
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学) // ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z16-2322
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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