Comparing the adsorption behaviors of Cd, Cu and Pb from water onto Fe-Mn binary oxide, MnO₂ and FeOOH

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 pH_iep 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.

Keywords

heavy metals / Fe-Mn binary oxide / manganese dioxide / ferric hydroxide / adsorption

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