Journal ArticleDOI
Surface catalysis of uranium(VI) reduction by iron(II)
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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.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1999-10-01. It has received 647 citations till now. The article focuses on the topics: Uranyl & Reaction rate constant.read more
Citations
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Comparison of arsenic(V) and arsenic(III) sorption onto iron oxide minerals: implications for arsenic mobility.
Suvasis Dixit,Janet G. Hering +1 more
TL;DR: The sorption data indicate that, under most of the chemical conditions investigated in this study, reduction of As(V) in the presence of HFO or goethite would have only minor effects on or even decrease its mobility in the environment at near-neutral pH conditions.
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
Surface complexation of ferrous iron and carbonate on ferrihydrite and the mobilization of arsenic.
TL;DR: Model calculations confirm that sorption of particularly carbonate at common soil and groundwater concentrations reduces the sorption capacity of arsenic on ferrihydrite significantly, a cause for the high concentrations of arsenic in groundwater in Bangladesh.
Journal ArticleDOI
Aquatic surface chemistry: Edited by Werner Stumm. Wiley, New York. 1987. $69.95 (ISBN 0471822951)
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GeoChip: a comprehensive microarray for investigating biogeochemical, ecological and environmental processes
Zhili He,Terry J. Gentry,Terry J. Gentry,Christopher W. Schadt,Liyou Wu,Liyou Wu,Jost Liebich,Jost Liebich,Song C. Chong,Zhijian Huang,Zhijian Huang,Wei-Min Wu,Baohua Gu,Phil Jardine,Craig S. Criddle,Jizhong Zhou,Jizhong Zhou +16 more
TL;DR: This is the first comprehensive microarray currently available for studying biogeochemical processes and functional activities of microbial communities important to human health, agriculture, energy, global climate change, ecosystem management, and environmental cleanup and restoration.
References
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Journal ArticleDOI
Adsorption of uranyl species from bicarbonate solution onto hematite particles
C.H Ho,N.H Miller +1 more
TL;DR: In this article, the adsorption of uranyl species onto a well-characterized hematite sol has been studied in the presence of bicarbonate ions and it was shown that the uptake of uranium decreases abruptly with increasing solution pH.
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On the Acid-Base Chemistry of Permanently Charged Minerals
TL;DR: In this article, the influence of the pH-independent charge of a solid on its acid-base properties was examined, where all the acid−base groups and pHindependent charges are distributed at the surface of a nonpenetrable solid, at the interface with the solution.
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Modeling the Removal of Uranium U(VI) from Aqueous Solutions in the Presence of Sulfate Reducing Bacteria
TL;DR: The reduction kinetics of soluble hexavalent uranium (U(VI)) to insoluble tetravalent U(IV) by both a mixed culture of wild-type sulfate-reducing bacteria (SRB) and a pure culture of Desulfovibrio desulfuricans (ATCC 7757) were studied at variable cell concentrations as discussed by the authors.
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Experimental study of mechanisms of fixation and reduction of uranium by sedimentary organic matter under diagenetic or hydrothermal conditions
TL;DR: In this article, the interaction between lignite and soluble uranyl species has been investigated experimentally at different temperatures from 20° to 400°C, and the results showed that the reduction of uranyl compounds by lignites results in a stoichiometric liberation of H+ in the solution medium.
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Cation adsorption on oxides and clays: The aluminum case
Laurent Charlet,Laurent Charlet,Paul W. Schindler,Lorenzo Spadini,Lorenzo Spadini,Gerhard Furrer,Gerhard Furrer,M. Zysset +7 more
TL;DR: In this article, the authors investigated the sorption mechanisms for trace metal ions on montmorillonite and found that adsorption at low pH is strongly ionic strength dependant.