Heterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutants
The results of the heterogeneous photocatalytic reduction of Fe(VI) in UV-irradiated TiO2 suspensions are presented and suggest indirect observation of the formation of Fe(V) by the photoreduction of Fe(VI) with ecb− at TiO2 surfaces. Because Fe(V) selectively and rapidly oxidizes low reactivity pol...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2003-01-01
|
| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X0300031X |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The results of the heterogeneous photocatalytic reduction of Fe(VI) in UV-irradiated TiO2 suspensions
are presented and suggest indirect observation of the formation of Fe(V) by the photoreduction
of Fe(VI) with ecb− at TiO2 surfaces. Because Fe(V) selectively and rapidly oxidizes low reactivity pollutants
with the production of the non-toxic by-product, Fe(III), the photocatalytic reduction of Fe(VI) has a role in
pollution remediation processes. The experiments were conducted as a function of TiO2 suspension concentrations,
Fe(VI) concentrations, and pH in basic media. The initial rate of Fe(VI) reduction gave a fractional
order with respect to initial Fe(VI) concentrations and adheres to simple Langmuir-Hinshelwood kinetics.
Results suggest that the surface reaction (Fe(VI)+ecb−→Fe(V)) is the rate-controlling step. The photocatalytic
reduction of Fe(VI) in the presence of less reactive nitrogen-containing species (ammonia, cyanate,
and fulvic acid) were also investigated. Enhancement in the rate of Fe(VI) reduction was observed. A reaction
scheme involving Fe(V) as an intermediate is presented which explains the faster photocatalytic oxidation
of pollutants in the presence of Fe(VI). |
|---|---|
| ISSN: | 1110-662X |