Journal ArticleDOI
Iron Oxide Surface-Catalyzed Oxidation of Ferrous Iron by Monochloramine: Implications of Oxide Type and Carbonate on Reactivity
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The kinetics of the reactions between Fe(II) and monochloramine in the presence of a variety of iron oxide surfaces are examined, finding differences in the activity of these oxides to result from variations in the amount of Fe( II) sorbed to each of the oxides and to dissimilarities in the surface site densities of the Oxides.Abstract:
The maintenance of monochloramine residuals in drinking water distribution systems is one technique often used to minimize microbial outbreaks and thereby maintain the safety of the water. Reactions between oxidizable species and monochloramine can however lead to undesirable losses in the disinfectant residual. Previous work has illustrated that the Fe(II) present within distribution systems is one type of oxidizable species that can exert a monochloramine demand. This paper extends this prior work by examining the kinetics of the reactions between Fe(II) and monochloramine in the presence of a variety of iron oxide surfaces. The identity of the iron oxide plays a significant role in the rate of these reactions. Surface area-normalized initial rate coefficients (kinit) obtained in the presence of each oxide at pH ≈6.9 exhibit the following trend in catalytic activity: magnetite > goethite > hematite ≈ lepidocrocite > ferrihydrite. The differences in the activity of these oxides are hypothesized to resul...read more
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Journal ArticleDOI
Biogeochemical Redox Processes and their Impact on Contaminant Dynamics
Thomas Borch,Ruben Kretzschmar,Andreas Kappler,Philippe Van Cappellen,Matthew Ginder-Vogel,Andreas Voegelin,Kate M. Campbell +6 more
TL;DR: Recent advances in the understanding of biogeochemical redox processes are highlighted and their impact on contaminant fate and transport, including future research needs are highlighted.
Journal ArticleDOI
Efficient removal of organic pollutants with magnetic nanoscaled BiFeO3 as a reusable heterogeneous fenton-like catalyst.
TL;DR: The strong H(2)O(2)-activating ability of BFO MNPs showed promising applications in the oxidative degradation of organic pollutants and was demonstrated to have excellent stability and reusability.
Journal ArticleDOI
Adsorption and surface oxidation of Fe(II) on metal (hydr)oxides.
TL;DR: In this paper, the CD coefficients have been linked to the mechanism of Fe(II) adsorption by nonferric and ferric (hydr)oxides with surface complexation modeling.
Journal ArticleDOI
Fe(II) Redox Chemistry in the Environment.
Jianzhi Huang,Adele M. Jones,T. David Waite,Yiling Chen,Xiaopeng Huang,Kevin M. Rosso,Andreas Kappler,Muammar Mansor,Paul G. Tratnyek,Huichun Zhang +9 more
TL;DR: In this paper, the authors present a comprehensive review of the redox reactivity of four types of Fe(II) species, including aqueous Fe, Fe complexed with ligands, minerals bearing structural Fe, and sorbed Fe on mineral oxide surfaces.
Journal ArticleDOI
Effects of Oxide Coating and Selected Cations on Nitrate Reduction by Iron Metal
TL;DR: Nitrate removal was most rapid at low pH (2-4); however, the formation of a black oxide film at pH 5 to 8 temporarily halted or slowed the reaction unless the system was augmented with Fe(2+), Cu( 2+), or Al(3+).
References
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Journal ArticleDOI
Rate Constants for Reactions of Inorganic Radicals in Aqueous Solution
TL;DR: In this article, rate constants have been compiled for reactions of various inorganic radicals produced by radiolysis or photolysis, as well as by other chemical means in aqueous solutions.
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Surface ionization and complexation at the oxide/water interface II. Surface properties of amorphous iron oxyhydroxide and adsorption of metal ions
James A. Davis,James O. Leckie +1 more
TL;DR: In this paper, the site-binding model for the electrical double layer of hydrous oxides reported in a previous paper is applied to the adsorption of metal ions from dilute solution and to complex heterogeneous systems, i.e., amorphous iron oxyhydroxide.
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Microbial Reduction of Crystalline Iron(III) Oxides: Influence of Oxide Surface Area and Potential for Cell Growth
Eric E. Roden,John M. Zachara +1 more
TL;DR: In this paper, the authors used a dissimilatory iron(III) oxide-reducing bacterium (Shewanella alga strain BrY) to investigate the properties of microbial crystalline iron-III oxide reduction.
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Surface catalysis of uranium(VI) reduction by iron(II)
TL;DR: In this article, the authors investigated the kinetic effect of specific adsorption interactions on the chemical reduction of uranyl (UVIO22+) by ferrous iron, and derived a rate law for surface-catalyzed U(VI) reduction by Fe(II), d[U(VI)] dt =−k[≡ Fe III OFe II OH 0 ][U( VI)] ads where the bimolecular rate constant k has a value of 399 ± 25 M−1 min−1 at 25°C.
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Reduction of Substituted Nitrobenzenes by Fe(II) in Aqueous Mineral Suspensions.
TL;DR: The results of this study demonstrate that Fe(ll) adsorbed on iron (hydr)oxide surfaces or surface coatings may play an important role in the reductive transformation of organic pollutants in subsurface environments.