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Comparing the adsorption behaviors of Cd, Cu and Pb from water onto Fe-Mn binary oxide, MnO2 and FeOOH |
Wei XU1,2,Huachun LAN1,Hongjie WANG3,Hongming LIU1,Jiuhui QU1,*() |
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 |
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Abstract 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-1, respectively. And that for FMBO were 0.37, 1.13, and 1.18 mmol·g-1 and for FeOOH were 0.11, 0.86 and 0.48 mmol·g-1, 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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Keywords
heavy metals
Fe-Mn binary oxide
manganese dioxide
ferric hydroxide
adsorption
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Corresponding Author(s):
Jiuhui QU
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Online First Date: 18 February 2014
Issue Date: 30 April 2015
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