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

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab., Richland, WA; Stanford University, Stanford, CA (US)
Sponsoring Org.:
USDOE Office of Environmental Management (EM) (US)
OSTI Identifier:
825970
Report Number(s):
EMSP-54635-2000
R&D Project: EMSP 54635; TRN: US200425%%25
DOE Contract Number:  
FG07-98ER14842
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CHEMISORPTION; CHEMISTRY; DEFECTS; IRON; MANGANESE OXIDES; MOLECULAR BEAM EPITAXY; MONOCRYSTALS; OXIDE MINERALS; OXIDES; PROBES; SEDIMENTS; SIMULATION; TRANSPORT; WATER

Citation Formats

Chambers, S A, and Brown, Jr G E. Molecular-Level Processes Governing the Interaction of Contaminants with Iron and Manganese Oxides. United States: N. p., 2000. Web. doi:10.2172/825970.
Chambers, S A, & Brown, Jr G E. Molecular-Level Processes Governing the Interaction of Contaminants with Iron and Manganese Oxides. United States. doi:10.2172/825970.
Chambers, S A, and Brown, Jr G E. Thu . "Molecular-Level Processes Governing the Interaction of Contaminants with Iron and Manganese Oxides". United States. doi:10.2172/825970. https://www.osti.gov/servlets/purl/825970.
@article{osti_825970,
title = {Molecular-Level Processes Governing the Interaction of Contaminants with Iron and Manganese Oxides},
author = {Chambers, S A and Brown, Jr G E},
abstractNote = {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.},
doi = {10.2172/825970},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {6}
}

Technical Report:

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