The chemistry of aqueous S(IV)-Fe-O2 system : State of the art

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)62_Review of books or of software (or similar publications/items)peer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)461-530
Journal / PublicationJournal of Sulfur Chemistry
Volume27
Issue number5
Publication statusPublished - 1 Oct 2006
Externally publishedYes

Abstract

The aqueous Fe-S(IV)-O2 system is kinetically superior to pure O2 in oxidizing inorganic (e.g., As(III) to As(V), S(IV) to S(VI)) or organic (e.g., phenol) compounds and can achieve EH levels (>1.3 V) that exceeds the O2-H2O couple. Fe-S(IV)-O2 is important in various geochemical, biochemical, atmospheric, and industrial processes, and thus much effort has been devoted to understanding the mechanistic aspect of its redox chemistry. Despite the many advances made recently, Fe-S(IV)-O2 redox chemistry has not been fully understood and elucidated. Clarification is needed on the redox chemistry of Fe-S(IV)-O2: from a mechanistic level (e.g. mode of catalysis, effects of ligand) to its relative importance in various natural processes (e.g., acid rain formation). We attempt to initiate some of these clarifications by: 1) critically examining experimental results, conclusions, and disagreements found in literature, 2) considering the Fe-S(IV)-O2 system in the light of other relevant chemistries, 3) highlighting difficulties in experimental practice that can interfere with the chemistry of Fe-S(IV)-O2, and 4) discussing future research needs. This review ends with a large compilation of available thermodynamic properties (complex stability constants, EH°) and kinetic data (rate expression, rate constants) relevant to Fe-S(IV)-O2 system. © 2006 Taylor & Francis.

Research Area(s)

  • Aqueous S(IV), Oxysulphur anions/radicals, Rate constants, Reaction mechanisms, Thermodynamics, Transition metal ions

Citation Format(s)

The chemistry of aqueous S(IV)-Fe-O2 system : State of the art. / Kuo, Dave T. F.; Kirk, Donald W.; Jia, Charles Q.

In: Journal of Sulfur Chemistry, Vol. 27, No. 5, 01.10.2006, p. 461-530.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)62_Review of books or of software (or similar publications/items)peer-review