Profiling iron corrosion coating on iron grains in a zerovalent iron system under the influence of dissolved oxygen

Zhang, Tian C.; Huang, Yong

doi:10.1016/j.watres.2006.04.026

Cited by 35 publications

(17 citation statements)

References 18 publications

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“…On the other hand, free access to oxygen leads to the formation of metastable ferric oxyhydroxide, FeOOH. This conclusion agrees also with the results obtained by Zhang and Huang ().…”

Section: Introductionsupporting

confidence: 93%

Modeling of the Temperature Effect on Oxygen Absorption by Iron‐Based Oxygen Scavengers

Polyakov

Miltz

2015

Journal of Food Science

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A new engineering-oriented model for prediction of the effect of temperature on the kinetics of oxygen absorption by iron-based oxygen scavengers (IOSs) was developed. The model is based on the physicochemical mechanism of the O2 scavenging process by the active component of the IOS (iron powder). The conclusions of this study are: (1) the iron deposits formed on the iron particles are composed of 2 different layers: an inner layer of Fe3 O4 and an outer layer of FeOOH that vanishes with the depletion of oxygen. (2) The model considers the chemical processes in the heterogeneous closed system "Fe-H2 O-NaCl-O2 " and describes the kinetics of oxygen absorption by the powder, depending on the characteristics of the system. (3) The nonlinear ordinary differential equation (ODE) of the O2 absorption kinetics was derived and a simple approximate solution to this ODE was obtained theoretically that is similar to the empirical exponential formula published in the relevant literature. (4) The temperature dependence of the oxygen absorption rate is more complicated than that described by the Arrhenius equation.

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“…On the other hand, free access to oxygen leads to the formation of metastable ferric oxyhydroxide, FeOOH. This conclusion agrees also with the results obtained by Zhang and Huang ().…”

Section: Introductionsupporting

confidence: 93%

Modeling of the Temperature Effect on Oxygen Absorption by Iron‐Based Oxygen Scavengers

Polyakov

Miltz

2015

Journal of Food Science

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“…Zero valent iron (ZVI) has been widely applied to degrade a variety of pollutants via reductive pathways, including the reductive transformation of halogenated solvents and reducible inorganic contaminants to less toxic products. − More recently, it has been demonstrated that the corrosion of ZVI in aerated systems can lead to the oxidation of inorganic contaminants and refractory organic pollutants that are difficult to remove through reductive pathways. − The corrosion of ZVI driven by dissolved oxygen (DO) has been reported to produce reactive oxygen intermediates (O 2 •‑ and H 2 O 2 ) and Fe(II) with further reaction between these products generating strongly oxidizing hydroxyl radicals (HO • ) and/or Fe(IV)O 2+ species via the Fenton reaction. ,,, The Fe(II) species formed during Fe(0) corrosion are oxidized, by both O 2 and H 2 O 2 , with the resulting Fe(III) species readily hydrolyzing and precipitating to form various Fe(III) (oxyhydr)oxides that provide surface adsorption sites for contaminants . The oxidation products of ZVI vary with the oxidants (e.g., H 2 O 2 , O 2 , KMnO 4 , NaClO) ,− and targeted contaminants. , Although various types of iron oxyhdroxides, such as goethite, hematite, magnetite and other amorphous phases of iron oxides/hydroxides can be produced from the intensive surface reaction between ZVI and strong oxidants such as H 2 O 2 , KMnO 4 , NaOCl, however ferrihydrite and lepidocrocite are the main products formed during ZVI oxidation in air. − …”

Section: Introductionmentioning

confidence: 99%

Effects of Good’s Buffers and pH on the Structural Transformation of Zero Valent Iron and the Oxidative Degradation of Contaminants

Collins

et al. 2018

Environ. Sci. Technol.

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The presence of Good's buffers caused rapid ZVI corrosion and a dramatic release of Fe(II) leading to the Fe(II)-catalyzed transformation of ferrihydrite to lepidocrocite and/or the direct formation of lepidocrocite from the oxidation of Fe(II) in the pH range 4.0-6.2. In comparison, in the absence of Good's buffers, elution of Fe(II) was insignificant with ferrihydrite being the only Fe(III) oxyhydroxide detected following the oxidative transformation of ZVI. The rapid ZVI corrosion in the presence of Good's buffer is possibly due to either (i) disruption of the Fe oxide surface layer as a result of attack by Good's buffers and/or (ii) interaction of Good's buffer with the outer Fe oxide surface and surface-associated Fe(II)/Fe(III) causing the Fe oxide surface layers to be more porous with both these processes facilitating continuous O access to the Fe(0) core and allowing the diffusion of Fe atoms outward. Our results further show that the deprotonated forms of Good's buffers and the surface charge of the Fe oxides formed at the ZVI surface strongly affect the sorption of the target compound (i.e., formate) and hence the oxidation of these compounds via surface-associated Fe(II)-mediated heterogeneous Fenton processes.

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“…Roberts et al (2004) have also shown that the presence of a high amount of iron improves the process of arsenic removal. Metallic iron can be used to supply the necessary iron to make up for the required Fe/As ratio (Bang et al, 2005;Zhang and Huang, 2006). Thus, attention has recently been focused on zero valent iron (ZVI) for the rapid removal of As(III) and As(V) in subsurface environments (Manning et al, 2002;Puls, 2001a, 2001b).…”

Section: Introductionmentioning

confidence: 99%

Arsenic Removal from Contaminated Groundwater by Zero Valent Iron: a Mechanistic and Long-Term Performance Study

Abedin

Tanaka

Inui

et al. 2011

Soils and Foundations

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Profiling iron corrosion coating on iron grains in a zerovalent iron system under the influence of dissolved oxygen

Cited by 35 publications

References 18 publications

Modeling of the Temperature Effect on Oxygen Absorption by Iron‐Based Oxygen Scavengers

Modeling of the Temperature Effect on Oxygen Absorption by Iron‐Based Oxygen Scavengers

Effects of Good’s Buffers and pH on the Structural Transformation of Zero Valent Iron and the Oxidative Degradation of Contaminants

Arsenic Removal from Contaminated Groundwater by Zero Valent Iron: a Mechanistic and Long-Term Performance Study

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