Clays and Clay Minerals

, Volume 58, Issue 5, pp 682–690 | Cite as

Reductive Activity of Adsorbed Fe(II) on Iron (Oxyhydr)Oxides for 2-Nitrophenol Transformation

  • Liang Tao
  • Fangbai LiEmail author
  • Yongkui Wang
  • Kewen Sun


Much attention has been paid to the adsorption of Fe(II) onto mineral surfaces as it is a crucial step in enhancing the reductive activity of Fe(II) species. The present study elucidates the role of Fe(II) adsorbed on Fe (oxyhydr)oxides (γ-FeOOH, α-FeOOH, and α-Fe2O3) for the reductive transformation of 2-nitrophenol (2-NP), using cyclic voltammetry (CV). Studies of Fe(II) adsorption and 2-NP reduction kinetics showed that an increase in pH gave rise to an elevated density of adsorbed Fe(II) on mineral surfaces, which further resulted in an enhanced reaction rate of 2-NP reduction. In addition, CV tests showed that the enhanced activity of Fe(II) species is attributed to the negative shift of peak oxidation potential (EP) of the Fe(III)/Fe(II) couple. The dependence of adsorbed Fe(II) reactivity on pH values was proven by the three linear correlations obtained (ln k vs. pH, EP vs. pH, and ln k vs. EP). The present study demonstrated that the reductive activity of adsorbed Fe(II) species can be indicated by the EP value of active Fe(II) species. Moreover, the electrochemical approach can be used as an effective tool to study the reductive activity of adsorbed Fe(II) species in subsurface environments.

Key Words

2-nitrophenol Adsorbed Fe(II) Cyclic Voltammetry Fe Oxides Redox potential Reductive Activity 


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Copyright information

© Clay Minerals Society 2010

Authors and Affiliations

  • Liang Tao
    • 1
    • 2
  • Fangbai Li
    • 1
    Email author
  • Yongkui Wang
    • 1
    • 2
  • Kewen Sun
    • 3
  1. 1.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated ControlGuangdong Institute of Eco-Environmental and Soil SciencesGuangzhouPR China
  2. 2.Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouPR China
  3. 3.Institute of Health and Environmental EcologyWenzhou Medical CollegeZhejiangPR China

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