Journal ArticleDOI
Arsenate and Chromate Retention Mechanisms on Goethite. 1. Surface Structure
TLDR
In this paper, the authors used Extended X-ray absorption fine structure (EXAFS) spectroscopy to deduce the local coordination environment of two environmental contaminants, arsenate and chromate, on the mineral goethite (α-FeOOH).Abstract:
The molecular structure of ions retained on mineral surfaces is needed to accurately model their sorption process and to determine their stability. Extended X-ray absorption fine structure (EXAFS) spectroscopy was used in this study to deduce the local coordination environment of two environmental contaminants, arsenate and chromate, on the mineral goethite (α-FeOOH). Based on the oxyanion−Fe distances, it was concluded that three different surface complexes exist on goethite for both oxyanions: a monodentate complex, a bidentate-binuclear complex, and a bidentate-mononuclear complex. At low surface coverages, the monodentate complex was favored while at higher coverages the bidentate complexes were more prevalentthe bidentate-binuclear complex appears to be in the greatest proportion at these highest surface coverages. Therefore, modeling efforts for chromate or arsenate retention on goethite need to consider a monodentate complex at very low coverages, both the monodentate and bidentate complexes at in...read more
Citations
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Journal ArticleDOI
Oxide- and Silicate-Water Interfaces and Their Roles in Technology and the Environment.
Jose Banuelos,Eric Borguet,Gordon E. Brown,Randall T. Cygan,James J. DeYoreo,Patricia M. Dove,Marie-Pierre Gaigeot,Franz M. Geiger,Julianne M. Gibbs,Vicki H. Grassian,Anastasia G. Ilgen,Young-Shin Jun,Nadine Kabengi,Lynn E. Katz,James D. Kubicki,Johannes Lützenkirchen,Christine V. Putnis,Richard C. Remsing,Kevin M. Rosso,Gernot Rother,Marialore Sulpizi,Mario Villalobos,Huichun Judy Zhang +22 more
TL;DR: A critical review of the state-of-the-art in the field of solid-water interfaces can be found in this paper , focusing on accomplishments in the last 20 years and identifying challenges and future opportunities for the community to address.
The Molecular Scale Nature of Copper (II) and Arsenate Bonding with Goethite-Humate Complexes
TL;DR: Alcacio et al. as mentioned in this paper studied the structure of copper and arsenate complexes on goethite in the presence and absence of adsorbed humic acid and with x-ray absorption near edge structure (XANES) spectroscopy.
Adsorption behavior of Fe-Mn binary oxide towards As(III) and As(V) and its application in biogas slurry
TL;DR: Li et al. as discussed by the authors investigated the adsorption behavior of arsenite and arsenate by Fe-Mn binary oxide (FMBO) and found that FMBO had strong adsorptive ability to both As(III) and As(V) and the maximum adsorithm was 111.10, 71.40 mg·g respectively.
Journal ArticleDOI
Decreased Electron Transfer between Cr(VI) and AH2DS in the Presence of Goethite.
TL;DR: Understanding abiotic electron transfer reactions that occur in systems with multiple redox active species is important to determine the contribution of abiotic redox reactions to Fe biogeochemical cycling in natural soils.
Dissertation
The removal of arsenic during drinking water treatment by sorption and coagulation processes
TL;DR: In this article, the authors investigated effective, affordable and sustainable arsenic removal technologies and to investigate the interactions between arsenic and natural organic matter in raw groundwaters, as well as during the treatments.
References
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Book
Environmental Chemistry of Soils
TL;DR: In this article, an introduction to modern soil chemistry describes chemical processes in soils in terms of established principles of inorganic, organic, and physical chemistry, providing an understanding of the structure of the solid mineral and organic materials from which soils are formed.
Book
Iron Oxides in the Laboratory: Preparation and Characterization
Udo Schwertmann,R. M. Cornell +1 more
TL;DR: In this paper, the main aim of the second edition is to present reliable, well-tested, up-to-date methods of synthesizing pure iron oxides, including monodispersed particles, presently of great interest to industry.
Journal ArticleDOI
Theoretical X-ray Absorption Fine Structure Standards
John J. Rehr,John J. Rehr,J. Mustre de Leon,S. I. Zabinsky,S. I. Zabinsky,R. C. Albers,R. C. Albers +6 more
Journal ArticleDOI
Surface chemistry of ferrihydrite: Part 1. EXAFS studies of the geometry of coprecipitated and adsorbed arsenate
TL;DR: In this article, the As and Fe K-edges were collected from samples of two-line ferrihydrite with adsorbed (ADS) and coprecipitated (CPT) arsenate prepared over a range of conditions and arsenate surface coverages.