Photodegradation of organic pollutants in aqueous solutions caused by Fe(OH)aq2+ photolysis: Evidence of OH radical formation
Photochemistry of Fe(III) hydroxocomplexes has a great interest because of possibility of hydroxyl radical formation at the primary photochemical step. This mechanism is based mainly on the analysis of the final products of photochemical reactions between light-excited Fe(III) complexes and organic...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2004-01-01
|
| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X04000133 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Photochemistry of Fe(III) hydroxocomplexes has a great interest because of possibility of hydroxyl
radical formation at the primary photochemical step. This mechanism is based mainly on the analysis
of the final products of photochemical reactions between light-excited Fe(III) complexes and organic compounds.
However, realization of an alternative mechanism of photolysis, based on the intermolecular electron
transfer from organic molecules located in the second coordination sphere to the light-excited complex could
take place. To distinguish these mechanisms, the experiments on the nanosecond laser flash photolysis of
Fe(OH)aq2+ in water solutions (pH 3) with organic additives; namely nitrobenzene, N,N-dimethylformamide,
and phenol have been performed. And the formation of the organic radicals Ph(•OH)NO2, HCON(CH2•)(CH3), and Ph(OH)2•, was observed, respectively. The rate constants of the formation and decay of the radicals coincide
with those found in literature. The results support the formation of the hydroxyl radical upon the
photolysis of Fe(OH)aq2+. |
|---|---|
| ISSN: | 1110-662X |