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Reductive activity of adsorbed Fe(II) on iron (oxyhydr)oxides for 2-nitrophenol transformation
Tao, Liang (Chinese Academy of Sciences. Guangzhou Institute of Geochemistry)
Li, Fangbai (Guangdong Institute of Eco-Environmental and Soil Sciences. Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control)
Wang, Yongkui (Chinese Academy of Sciences. Guangzhou Institute of Geochemistry)
Sun, Kewen (Wenzhou Medical College. Institute of Health and Environmental Ecology)

Fecha: 2010
Resumen: 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-FeO) 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 (E) 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, E vs. pH, and ln k vs. E). The present study demonstrated that the reductive activity of adsorbed Fe(II) species can be indicated by the E 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.
Derechos: Tots els drets reservats.
Lengua: Anglès
Documento: article ; recerca ; publishedVersion
Materia: 2-nitrophenol ; Adsorbed Fe(II) ; Cyclic Voltammetry ; Fe Oxides ; Redox potential ; Reductive Activity
Publicado en: Clays and Clay Minerals, Vol. 58, Núm. 5 (2010) , p. 682-690, ISSN 1552-8367

DOI: 10.1346/CCMN.2010.0580507


9 p, 1.0 MB
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