Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions
The photocatalytic degradationof EDTA over TiO2 has been analyzed to establish the influence of oxidants on the reaction rate, the nature of the intermediates and the kinetic regime. Degussa P-25 suspensions containing EDTA at initial pH 3 in different concentrations were irradiated under near UV li...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2001-01-01
|
| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X01000253 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832562676747730944 |
|---|---|
| author | Paola A. Babay Carina A. Emilio Rosana E. Ferreyra Eduardo A. Gautier Raquel T. Gettar Marta I. Litter |
| author_facet | Paola A. Babay Carina A. Emilio Rosana E. Ferreyra Eduardo A. Gautier Raquel T. Gettar Marta I. Litter |
| author_sort | Paola A. Babay |
| collection | DOAJ |
| description | The photocatalytic degradationof EDTA over TiO2 has been analyzed to establish the influence
of oxidants on the reaction rate, the nature of the intermediates and the kinetic regime. Degussa P-25 suspensions
containing EDTA at initial pH 3 in different concentrations were irradiated under near UV light.
A Langmuirian behavior was observed. O2 at saturation concentrations was found to be crucial for EDTA
degradation. The rapid depletion of EDTA was not accompanied by a corresponding TOC decrease, indicating
formation of refractory intermediates. An enhancement in TOC reduction could be achieved by keeping pH
constant or by hydrogen peroxide addition. Addition of Fe(III) caused a remarkable increase on the initial
rate of EDTA consumption and also on TOC decrease. Changes in both parameters clearly increased under
the simultaneous addition of Fe(III) and H2O2, until limiting values. |
| format | Article |
| id | doaj-art-7c164d0496e34223943c0605f7749f6e |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2001-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-7c164d0496e34223943c0605f7749f6e2025-02-03T01:21:58ZengWileyInternational Journal of Photoenergy1110-662X2001-01-013419319910.1155/S1110662X01000253Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditionsPaola A. Babay0Carina A. Emilio1Rosana E. Ferreyra2Eduardo A. Gautier3Raquel T. Gettar4Marta I. Litter5Unidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499, Prov. de Buenos Aires, San Martín (1650), ArgentinaUnidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499, Prov. de Buenos Aires, San Martín (1650), ArgentinaUnidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499, Prov. de Buenos Aires, San Martín (1650), ArgentinaUnidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499, Prov. de Buenos Aires, San Martín (1650), ArgentinaUnidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499, Prov. de Buenos Aires, San Martín (1650), ArgentinaUnidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica; Av. Gral. Paz 1499, Prov. de Buenos Aires, San Martín (1650), ArgentinaThe photocatalytic degradationof EDTA over TiO2 has been analyzed to establish the influence of oxidants on the reaction rate, the nature of the intermediates and the kinetic regime. Degussa P-25 suspensions containing EDTA at initial pH 3 in different concentrations were irradiated under near UV light. A Langmuirian behavior was observed. O2 at saturation concentrations was found to be crucial for EDTA degradation. The rapid depletion of EDTA was not accompanied by a corresponding TOC decrease, indicating formation of refractory intermediates. An enhancement in TOC reduction could be achieved by keeping pH constant or by hydrogen peroxide addition. Addition of Fe(III) caused a remarkable increase on the initial rate of EDTA consumption and also on TOC decrease. Changes in both parameters clearly increased under the simultaneous addition of Fe(III) and H2O2, until limiting values.http://dx.doi.org/10.1155/S1110662X01000253 |
| spellingShingle | Paola A. Babay Carina A. Emilio Rosana E. Ferreyra Eduardo A. Gautier Raquel T. Gettar Marta I. Litter Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions International Journal of Photoenergy |
| title | Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions |
| title_full | Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions |
| title_fullStr | Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions |
| title_full_unstemmed | Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions |
| title_short | Kinetics and mechanisms of EDTA photocatalytic degradation with TiO2 under different experimental conditions |
| title_sort | kinetics and mechanisms of edta photocatalytic degradation with tio2 under different experimental conditions |
| url | http://dx.doi.org/10.1155/S1110662X01000253 |
| work_keys_str_mv | AT paolaababay kineticsandmechanismsofedtaphotocatalyticdegradationwithtio2underdifferentexperimentalconditions AT carinaaemilio kineticsandmechanismsofedtaphotocatalyticdegradationwithtio2underdifferentexperimentalconditions AT rosanaeferreyra kineticsandmechanismsofedtaphotocatalyticdegradationwithtio2underdifferentexperimentalconditions AT eduardoagautier kineticsandmechanismsofedtaphotocatalyticdegradationwithtio2underdifferentexperimentalconditions AT raqueltgettar kineticsandmechanismsofedtaphotocatalyticdegradationwithtio2underdifferentexperimentalconditions AT martailitter kineticsandmechanismsofedtaphotocatalyticdegradationwithtio2underdifferentexperimentalconditions |