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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Main Authors: Abramović Biljana F., Anderluh Vesna B., Šojić Daniela V., Gaál Ferenc F.
Format: Article
Language:English
Published: Serbian Chemical Society 2007-01-01
Series:Journal of the Serbian Chemical Society
Subjects:
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.
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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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AT anderluhvesnab photocatalyticremovaloftheherbicideclopyralidfromwater
AT sojicdanielav photocatalyticremovaloftheherbicideclopyralidfromwater
AT gaalferencf photocatalyticremovaloftheherbicideclopyralidfromwater