Faust, Bruce Charles (1985) Photo-induced reductive dissolution of hematite ([alpha]-Fe2O3) by S(IV) oxyanions. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-03262008-141334
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The kinetics and mechanism of the photo-induced reductive dissolution of hematite ([alpha]-Fe2O3) by S(IV) oxyanions, in aqueous suspensions of hematite, have been investigated. Experimental quantum yields for Fe(II)[...] production are reported for deoxygenated hematite suspensions containing S(IV). Quantum yield studies together with spectroscopic information indicate that [...]Fe(III)—S(IV) surface complexes undergo a photo-induced ligand to metal charge transfer reaction resulting in the reductive dissolution of hematite and production of Fe(II)[...].
The autoxidation of S(IV) in oxygenated hematite suspensions exhibits autocatalytic behavior. This behavior is interpreted in terms of three general processes: i) production of Fe(II)[...] from photo-induced ligand to metal charge transfer reactions of [...]Fe(I11)--S(IV) surface complexes, ii) oxidation of Fe(II)[...] to Fe(III)[...] and, iii) the Fe(III)[...] catalyzed autoxidation of S(IV). A numerical model, based on these processes, is developed to predict the disappearance of S(IV) in oxygenated hematite suspensions under illumination.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Engineering and Applied Science|
|Major Option:||Environmental Science and Engineering|
|Thesis Availability:||Restricted to Caltech community only|
|Defense Date:||2 October 1984|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||04 Apr 2008|
|Last Modified:||26 Dec 2012 02:35|
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