Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22087
Title: Electrochemical evidences for promoted interfacial reactions : the role of Fe(II) adsorbed onto γ-Al2O3 and TiO2 in reductive transformation of 2-nitrophenol
Authors: Li, FB
Tao, L
Feng, CH
Li, XZ
Sun, KW
Issue Date: 2009
Publisher: American Chemical Society
Source: Environmental science & technology, 2009, v. 43, no. 10, p. 3656-3661 How to cite?
Journal: Environmental science & technology 
Abstract: This study was aimed at elucidating the role of adsorbed Fe(II) on minerals in the reductive transformation of 2-nitrophenol (2-NP) by using electrochemical methods. The studies of Fe(II) adsorption and 2-NP reduction kinetics showed that the identity of minerals such as γ-Al 2O3 and TiO2 and the solution pH were crucial factors to determine the Fe(II) adsorption behavior and to influence the rate constant (k) of 2-NP reduction. Furthermore, two electrochemical methods, cyclic voltammetry (CV) and electrochemical impedance spectrometry (EIS), were applied to characterize the Fe(II) reactivity with both the mineral-coated and mineral-free electrodes. The electrochemical evidence confirmed that the peak oxidation potential (EP) of complex Fe(II) can be significantly affected by the solution pH; the enhanced reductive transformation of 2-NP can be related to the reduced EP of surface-complex Fe(II) and the reduced charge transfer resistance (RCT) of the Fe(III)/Fe(II) couple. All these relationships were studied quantitatively. At pH 6.7, the measured EP and RCT decreased in the order TiO 2/GC < γ-Al2O3/GC < GC (E P, 0.140 < 0.190 < 0.242 V; RCT, 0.30 < 0.41 < 0.78 kΩ), while the 2-NP reduction on different minerals were in the order TiO2 γ γ-Al2O3 > nonmineral (k × 10-2, 7.91 > 0.64 > 0.077 min -1).
URI: http://hdl.handle.net/10397/22087
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/es8033445
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