Photocatalytic removal of the herbicide clopyralid from water
The stability of the herbicide clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) was studied under different experimental conditions of pH, illumination and initial substrate concentration. It was found that in the pH interval from 1.0 to 9.0 in the presence/absence of daylight, clopyralid solutio...
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Serbian Chemical Society
2007-01-01
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Series: | Journal of the Serbian Chemical Society |
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Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2007/0352-51390712477A.pdf |
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author | Abramović Biljana F. Anderluh Vesna B. Šojić Daniela V. Gaál Ferenc F. |
author_facet | Abramović Biljana F. Anderluh Vesna B. Šojić Daniela V. Gaál Ferenc F. |
author_sort | Abramović Biljana F. |
collection | DOAJ |
description | The stability of the herbicide clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) was studied under different experimental conditions of pH, illumination and initial substrate concentration. It was found that in the pH interval from 1.0 to 9.0 in the presence/absence of daylight, clopyralid solutions were stable for at least a period of two months. The kinetics of the photocatalytic degradation of clopyralid in aqueous suspensions of TiO2 (Degussa P25) under UV and visible light, as well as of direct photolysis using the same radiation sources, were also investigated. It was found that the rate of photocatalytic degradation in the presence of UV light was more than five times higher compared to direct photolysis, whereas in the presence of visible light, the corresponding rates of photocatalytic/photolytic degradation were much lower (more than 15 times). The reaction in the investigation concentration range is zero-order with respect to the degradation of the clopyralid pyridine moiety, with a reaction rate of 3.4×10-6 mol dm-3 min-1 and an adsorption coefficient of the substrate of 2.5×104 dm3 mol-1. |
first_indexed | 2024-12-19T16:45:56Z |
format | Article |
id | doaj.art-3bee4a304aec4d888ea50b69c36c45fe |
institution | Directory Open Access Journal |
issn | 0352-5139 1820-7421 |
language | English |
last_indexed | 2024-12-19T16:45:56Z |
publishDate | 2007-01-01 |
publisher | Serbian Chemical Society |
record_format | Article |
series | Journal of the Serbian Chemical Society |
spelling | doaj.art-3bee4a304aec4d888ea50b69c36c45fe2022-12-21T20:13:39ZengSerbian Chemical SocietyJournal of the Serbian Chemical Society0352-51391820-74212007-01-0172121477148610.2298/JSC0712477A0352-51390712477APhotocatalytic removal of the herbicide clopyralid from waterAbramović Biljana F.0Anderluh Vesna B.1Šojić Daniela V.2Gaál Ferenc F.3Prirodno-matematički fakultet, Departman za hemiju, Novi SadPrirodno-matematički fakultet, Departman za hemiju, Novi SadPrirodno-matematički fakultet, Departman za hemiju, Novi SadVojvođanska akademija nauka i umetnosti, Novi SadThe stability of the herbicide clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) was studied under different experimental conditions of pH, illumination and initial substrate concentration. It was found that in the pH interval from 1.0 to 9.0 in the presence/absence of daylight, clopyralid solutions were stable for at least a period of two months. The kinetics of the photocatalytic degradation of clopyralid in aqueous suspensions of TiO2 (Degussa P25) under UV and visible light, as well as of direct photolysis using the same radiation sources, were also investigated. It was found that the rate of photocatalytic degradation in the presence of UV light was more than five times higher compared to direct photolysis, whereas in the presence of visible light, the corresponding rates of photocatalytic/photolytic degradation were much lower (more than 15 times). The reaction in the investigation concentration range is zero-order with respect to the degradation of the clopyralid pyridine moiety, with a reaction rate of 3.4×10-6 mol dm-3 min-1 and an adsorption coefficient of the substrate of 2.5×104 dm3 mol-1.http://www.doiserbia.nb.rs/img/doi/0352-5139/2007/0352-51390712477A.pdfclopyralidphotocatalytic degradationtio2 degussa p25photolysiswater treatment |
spellingShingle | Abramović Biljana F. Anderluh Vesna B. Šojić Daniela V. Gaál Ferenc F. Photocatalytic removal of the herbicide clopyralid from water Journal of the Serbian Chemical Society clopyralid photocatalytic degradation tio2 degussa p25 photolysis water treatment |
title | Photocatalytic removal of the herbicide clopyralid from water |
title_full | Photocatalytic removal of the herbicide clopyralid from water |
title_fullStr | Photocatalytic removal of the herbicide clopyralid from water |
title_full_unstemmed | Photocatalytic removal of the herbicide clopyralid from water |
title_short | Photocatalytic removal of the herbicide clopyralid from water |
title_sort | photocatalytic removal of the herbicide clopyralid from water |
topic | clopyralid photocatalytic degradation tio2 degussa p25 photolysis water treatment |
url | http://www.doiserbia.nb.rs/img/doi/0352-5139/2007/0352-51390712477A.pdf |
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