REDUCTIVE ACTIVITY OF ADSORBED Fe(II) ON IRON (OXYHYDR)OXIDES FOR 2-NITROPHENOL TRANSFORMATION

文献类型： 外文期刊

第一作者： Tao, Liang

作者： Tao, Liang;Li, Fangbai;Wang, Yongkui;Tao, Liang;Wang, Yongkui;Sun, Kewen

作者机构：

关键词： 2-nitrophenol;adsorbed Fe(II);cyclic voltammetry;Fe oxides;redox potential;reductive activity

期刊名称：CLAYS AND CLAY MINERALS （ 影响因子：1.609； 五年影响因子：2.162 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： 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-Fe_2O_3) 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_P) 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 (In k vs. pH, E_P vs. pH, and In k vs. E_P). The present study demonstrated that the reductive activity of adsorbed Fe(II) species can be indicated by the E_P 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.

分类号： P57

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