Molecular-Level Processes Governing the Interaction of Contaminants with Iron and Manganese Oxides

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The central tenet of this program is that a fundamental understanding of specific mineral surface-site reactivities will substantially improve reactive transport models of contaminants in geologic systems, and will allow more effective remediation schemes to be devised. To this end, we carried out a program of research that focuses on the fundamental mechanisms of redox chemistry of contaminants on mineral surfaces. As much of this chemistry in sediments involves the Fe(III)/Fe(II) couples, we focused on mineral phases containing these species. Our approach was to conduct carefully controlled experiments on model, single-crystal Fe oxide mineral surfaces grown by molecular beam epitaxy, ... continued below

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Chambers, S.A. & Brown, Jr. G.E. June 1, 2000.

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Description

The central tenet of this program is that a fundamental understanding of specific mineral surface-site reactivities will substantially improve reactive transport models of contaminants in geologic systems, and will allow more effective remediation schemes to be devised. To this end, we carried out a program of research that focuses on the fundamental mechanisms of redox chemistry of contaminants on mineral surfaces. As much of this chemistry in sediments involves the Fe(III)/Fe(II) couples, we focused on mineral phases containing these species. Our approach was to conduct carefully controlled experiments on model, single-crystal Fe oxide mineral surfaces grown by molecular beam epitaxy, natural Fe oxide single crystals, and synthetic mineral powders. We used the results from the model surfaces, which were very well defined in terms of surface composition, structure, and defect densities, to understand the results obtained on more complex mineral specimens. We used a variety of experimental probes, along with molecular modeling theory, to determine clean mineral surface structure, details of the chemisorption and decomposition of water, and the interface structure and redox chemistry of important contaminants such as CrO4 -2 on these surfaces.

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  • Other Information: PBD: 1 Jun 2000

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  • Report No.: EMSP-54635--2000
  • Grant Number: FG07-98ER14842
  • DOI: 10.2172/825970 | External Link
  • Office of Scientific & Technical Information Report Number: 825970
  • Archival Resource Key: ark:/67531/metadc780716

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  • June 1, 2000

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 21, 2016, 8:46 p.m.

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Chambers, S.A. & Brown, Jr. G.E. Molecular-Level Processes Governing the Interaction of Contaminants with Iron and Manganese Oxides, report, June 1, 2000; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc780716/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.