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Glasser Thesis.pdf (9.92 MB)
ETD Abstract Container
Abstract Header
Kinetics and Mechanisms of Cr
6+
Reduction by Structural Fe(II) in Clay Minerals
Author Info
Glasser, Paul Allen
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=miami1389010915
Abstract Details
Year and Degree
2014, Master of Science, Miami University, Geology and Environmental Earth Science.
Abstract
Hexavalent chromium (Cr
6+
) is a toxic environmental contaminant. Microbial bioreduction of structural Fe(III) in clay minerals and subsequent reaction with Cr
6+
is a sustainable remediation method. Clay minerals naturally undergo multiple redox cycles, which may affect reactivity towards Cr
6+
reduction. The kinetics and reactivity of this reaction are poorly understood. The objective of this study was to understand the kinetics and mechanisms of Cr
6+
reduction by clay mineral structural Fe(II). A suite of Fe(III)-bearing clay minerals were bioreduced and re-oxidized four times. In each cycle, bioreduced clay mineral reactivity and kinetics towards Cr
6+
reduction was tested. Generally with increased redox cycling, rate and extent of Fe(III) bioreduction decreased, whereas with Cr
6+
it increased, especially with temperature. Reaction products were analyzed for changes in physicochemical properties, mineralogy, and morphology by spectroscopy and microscopy. Redox cycling induced permanent changes in surface area, but little mineralogical change, suggesting clay minerals largely remained in solid state. Reduced Cr(III) phases occurred in the form of Cr-Fe-hydroxides. This study has implications for understanding clay-metal redox chemistry and Cr
6+
remediation at contaminated sites.
Committee
Hailiang Dong, PhD (Advisor)
Mark Krekeler, PhD (Committee Member)
Jonathan Levy, PhD (Committee Member)
Pages
76 p.
Subject Headings
Biogeochemistry
;
Geobiology
;
Geology
;
Mineralogy
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Citations
Glasser, P. A. (2014).
Kinetics and Mechanisms of Cr
6+
Reduction by Structural Fe(II) in Clay Minerals
[Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1389010915
APA Style (7th edition)
Glasser, Paul.
Kinetics and Mechanisms of Cr
6+
Reduction by Structural Fe(II) in Clay Minerals.
2014. Miami University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=miami1389010915.
MLA Style (8th edition)
Glasser, Paul. "Kinetics and Mechanisms of Cr
6+
Reduction by Structural Fe(II) in Clay Minerals." Master's thesis, Miami University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1389010915
Chicago Manual of Style (17th edition)
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Document number:
miami1389010915
Download Count:
1,609
Copyright Info
© 2014, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.