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...
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| Format: | Article |
| Language: | English |
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Wiley
2003-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X0300031X |
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| author | Virender K. Sharma Kurt Winkelmann Yekaterina Krasnova Changyoul Lee Mary Sohn |
| author_facet | Virender K. Sharma Kurt Winkelmann Yekaterina Krasnova Changyoul Lee Mary Sohn |
| author_sort | Virender K. Sharma |
| collection | DOAJ |
| description | 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). |
| format | Article |
| id | doaj-art-9d99d786ac7e4f0699da9c4c151a53f6 |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2003-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-9d99d786ac7e4f0699da9c4c151a53f62025-08-20T03:38:19ZengWileyInternational Journal of Photoenergy1110-662X2003-01-015318319010.1155/S1110662X0300031XHeterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutantsVirender K. Sharma0Kurt Winkelmann1Yekaterina Krasnova2Changyoul Lee3Mary Sohn4Department of Chemistry, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, USADepartment of Chemistry, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, USADepartment of Chemistry, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, USADepartment of Chemistry, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, USADepartment of Chemistry, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, USAThe 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).http://dx.doi.org/10.1155/S1110662X0300031X |
| spellingShingle | Virender K. Sharma Kurt Winkelmann Yekaterina Krasnova Changyoul Lee Mary Sohn Heterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutants International Journal of Photoenergy |
| title | Heterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutants |
| title_full | Heterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutants |
| title_fullStr | Heterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutants |
| title_full_unstemmed | Heterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutants |
| title_short | Heterogeneous photocatalytic reduction of ferrate(VI) in UV-irradiated titania suspensions: Role in enhancing destruction of nitrogen-containing pollutants |
| title_sort | heterogeneous photocatalytic reduction of ferrate vi in uv irradiated titania suspensions role in enhancing destruction of nitrogen containing pollutants |
| url | http://dx.doi.org/10.1155/S1110662X0300031X |
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