Comparing the adsorption behaviors of Cd, Cu and Pb from water onto Fe-Mn binary oxide, MnO2 and FeOOH
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  • 作者:Wei Xu ; Huachun Lan ; Hongjie Wang…
  • 关键词:heavy metals ; Fe ; Mn binary oxide ; manganese dioxide ; ferric hydroxide ; adsorption
  • 刊名:Frontiers of Environmental Science & Engineering
  • 出版年:2015
  • 出版时间:June 2015
  • 年:2015
  • 卷:9
  • 期:3
  • 页码:385-393
  • 全文大小:492 KB
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  • 作者单位:Wei Xu (1) (2)
    Huachun Lan (1)
    Hongjie Wang (3)
    Hongming Liu (1)
    Jiuhui Qu (1)

    1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
    2. Graduate University of Chinese Academy of Sciences, Beijing, 100039, China
    3. College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
  • 刊物主题:Environment, general;
  • 出版者:Springer Berlin Heidelberg
  • ISSN:2095-221X
文摘
The adsorption potential of FMBO, FeOOH, MnO2 for the removal of Cd2+, Cu2+ and Pb2+ in aqueous systems was investigated in this study. Comparing to FMBO and FeOOH, MnO2 offered a much higher removal capacity towards the three metal ions. The maximal adsorption capacity of MnO2 for Cd2+, Cu2+ and Pb2+ were 1.23, 2.25 and 2.60 mmol·g?, respectively. And that for FMBO were 0.37, 1.13, and 1.18 mmol·g? and for FeOOH were 0.11, 0.86 and 0.48 mmol·g?, respectively. The adsorption behaviors of the three metal ions on the three adsorbents were all significantly affected by pH values and heavy metal removal efficiency increased with pH increased. The Langmuir and Freundlich adsorption models were used to describe the adsorption equilibrium of the three metal ions onto the three adsorbents. Results showed that the adsorption equilibrium data fitted well to Langmuir isotherm and this indicated that adsorption of metal ions occurred on the three metal oxides adsorbents limited to the formation of a monolayer. More negative charged of MnO2 surface than that of FMBO and FeOOH could be ascribed by lower pHiep of MnO2 than that of FMBO and FeOOH and this could contribute to more binding sites on MnO2 surface than that of FMBO and FeOOH. The higher metal ions uptake by MnO2 than FMBO and FeOOH could be well explained by the surface charge mechanism.

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