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Photo-induced reductive dissolution of hematite ([alpha]-Fe2O3) by S(IV) oxyanions

Citation

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

Abstract

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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
Research Advisor(s):
  • Hoffmann, Michael R.
Thesis Committee:
  • Hoffmann, Michael R. (chair)
  • Cass, Glen Rowan
  • Morgan, James J.
  • Seinfeld, John H.
  • Johnson, William Lewis
Defense Date:2 October 1984
Record Number:CaltechETD:etd-03262008-141334
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-03262008-141334
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1160
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:04 Apr 2008
Last Modified:26 Dec 2012 02:35

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