Mechanisms for aqueous photolysis of adsorbed benzoate, oxalate, and succinate on iron oxyhydroxide (goethite) surfaces
Journal Article
·
· Environ. Sci. Technol.; (United States)
Photolysis of carboxylate anions adsorbed onto highly crystalline goethite (..cap alpha..-FeOOH) with 300-400-nm light produces Fe/sup 2 +/(aq) and /sup ./OH from surface and solution redox reactions. The production of Fe/sup 2 +/(aq) and /sup ./OH was studied in N/sub 2/-purged and aerated aqueous suspensions, respectively, of goethite containing equimolar (10/sup -3/ M) concentrations of oxalate and benzoate (ob + g), succinate and benzoate (sb + g), benzoate alone (b + g), and goethite alone (g). The hydroxyl radical was measured by fluorescence analysis of salicylate formed in a reaction between benzoate and /sup ./OH. Fe/sup 2 +/(aq) was determined colorimetrically. A proposed reaction mechanism includes the photoexcitation of Fe(III) surface complexes with OH/sup -/, HCO/sub 3//sup -/, and RCOO/sup -/ ligands to form Fe/sup 2 +/(aq) and corresponding ligand radicals. Additional /sup ./OH is made by the O/sub 2/ oxidation of Fe/sup 2 +/(aq). Comparison of Fe/sup 2 +/(aq) and /sup ./OH yields permitted an estimate of the relative importance of pathways leading to /sup ./OH.
- Research Organization:
- Geological Survey, Denver, CO (USA)
- OSTI ID:
- 6146971
- Journal Information:
- Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 22:9; ISSN ESTHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AQUEOUS SOLUTIONS
BENZOIC ACID
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DICARBOXYLIC ACIDS
DISPERSIONS
GOETHITE
HYDROXYL RADICALS
IONS
IRON COMPOUNDS
MINERALS
MIXTURES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALIC ACID
OXIDATION
OXIDE MINERALS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
REDOX REACTIONS
SOLUTIONS
SORPTION
SUCCINIC ACID
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
WATER CHEMISTRY
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AQUEOUS SOLUTIONS
BENZOIC ACID
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DICARBOXYLIC ACIDS
DISPERSIONS
GOETHITE
HYDROXYL RADICALS
IONS
IRON COMPOUNDS
MINERALS
MIXTURES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALIC ACID
OXIDATION
OXIDE MINERALS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
REDOX REACTIONS
SOLUTIONS
SORPTION
SUCCINIC ACID
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
WATER CHEMISTRY