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Photooxidation of foramsulfuron: Effects of char substances

Paper ID Volume ID Publish Year Pages File Format Full-Text
25963 43925 2016 5 PDF Available
Title
Photooxidation of foramsulfuron: Effects of char substances
Abstract

•Semiconductor catalysts were tested for foramsulfuron degradation in the presence of visible light.•ZnO was more effective thanTiO2 in the foramsulfuron photodegradation.•FRS photostability was tested in the presence of biochar and hydrochar.•Biochar and hydrochar produced different effects on the photocatalytic process.

The photodegradation of the herbicide foramsulfuron (FRS) in simulated sunlight was studied in water and in the presence of photocatalysts and chars. The photodegradation in distilled water was rather slow and the metabolite 2-amino-4,6-dimethoxypyrimidine was the only by-product detected. In the presence of TiO2 and ZnO, a very fast photodegradation occurred affording a complete mineralization of the herbicide.The presence of a biochar (BC), derived from the pyrolysis of woodlands, in irradiated FRS solution caused a slight slowdown of the FRS photodegradation rate. Instead, the addition of a liquid hydrochar (HC), obtained by the hydrothermal carbonization of maize, halved the half-life time of the herbicide. The addition of BC to FRS solutions containing TiO2 or ZnO did not affect the herbicide degradation rate. On the other hand, the addition of HC, while not influencing significantly the FRS degradation catalysed by ZnO, slowed very much the TiO2-promoted degradation. The different trends of FRS photodegradation in the presence of BC or HC have been interpreted on the basis of the physico-chemical characteristics of the two chars. The addition of 2-propanol or EDTA, which are selective scavengers of radicals and holes respectively, to catalysed systems increased FRS half-life time. The addition of 2-propanol reduced the FRS photodegradation rate to a higher extent than EDTA, thus emphasizing the role of radicals in the photodecomposition mediated by the two semiconductors.

Keywords
Foramsulfuron; Photodegradation; Photocatalist; Biochar; Hydrochar
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 326, 15 July 2016, Pages 16–20
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us