נגישות
menu      
Advanced Search
Syntax
Search...
Volcani treasures
About
Terms of use
Manage
Community:
אסיף מאגר המחקר החקלאי
Powered by ClearMash Solutions Ltd -
Dye-sensitized photooxidation of bromacil in water
Year:
1980
Source of publication :
Journal of Environmental Quality
Authors :
Acher, Aureliu J.
;
.
Saltzman, Sarina
;
.
Volume :
9
Co-Authors:
Acher, A.J., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Saltzman, S., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Facilitators :
From page:
190
To page:
194
(
Total pages:
5
)
Abstract:
Irradiation of an aerated bromacil (3-sec-butyl-5-bromo-6-methyl-uracil) aqueous solution (250 ppm), by exposure to direct solar radiation in the presence of different dye-sensitizers and an appropriate pH, led to complete and fast photodecomposition of the title compound. The photoreaction mixture spotted on TLC showed one major intermediate, 3-sec-butyl-2-acetyl-2-hydroxy-hydantoin. GLC showed another, minor, intermediate, the 5,5'-dimer photo-product of 3-sec-butyl-6-methyluracil. The most effective dye sensitizers checked were riboflavin (10 ppm) and methylene blue (2 to 5 ppm). Less effective were rose bengal (5 ppm), humic acids (20 ppm), and chlorophyll (20 ppm). The rate of reaction was pH dependent, being faster at alkaline pH and almost negligible in acidic solutions. Under optimal experimental conditions the photooxidation was completed after about 1 hour, and further irradiation resulted in the decomposition of the intermediate products and the formation of unidentified polar products.Irradiation of an aerated bromacil (3-sec-butyl-5-bromo-6-methyluracil) aqueous solution (250 ppm), by exposure to direct solar radiation in the presence of different dye-sensitizers and an appropriate pH, led to complete and fast photodecomposition of the title compound. The photoreaction mixture spotted on TLC showed one major intermediate, 3-sec-butyl-2-acetyl-2-hydroxy-hydantoin. GLC showed another, minor, intermediate, the 5,5 prime -dimer photo-product of 3-sec-butyl-6-methyluracil. The most effective dye sensitizers checked were riboflavin (10 ppm) and methylene blue (2 to 5 ppm). The rate of reaction was pH dependent, being faster at alkaline pH and almost negligible in acidic solutions. Under optimal experimental conditions the photooxidation was completed after about 1 hour.
Note:
Related Files :
Bromacil
CHEMICAL REACTIONS - Photochemical Reactions
Dyes and Dyeing
herbicides
photooxidation
theoretical study
water
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
Language:
English
Editors' remarks:
ID:
27884
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:34
Scientific Publication
Dye-sensitized photooxidation of bromacil in water
9
Acher, A.J., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Saltzman, S., Agric. Res. Organ., Volcani Cent., Bet Dagan, Israel
Dye-sensitized photooxidation of bromacil in water
Irradiation of an aerated bromacil (3-sec-butyl-5-bromo-6-methyl-uracil) aqueous solution (250 ppm), by exposure to direct solar radiation in the presence of different dye-sensitizers and an appropriate pH, led to complete and fast photodecomposition of the title compound. The photoreaction mixture spotted on TLC showed one major intermediate, 3-sec-butyl-2-acetyl-2-hydroxy-hydantoin. GLC showed another, minor, intermediate, the 5,5'-dimer photo-product of 3-sec-butyl-6-methyluracil. The most effective dye sensitizers checked were riboflavin (10 ppm) and methylene blue (2 to 5 ppm). Less effective were rose bengal (5 ppm), humic acids (20 ppm), and chlorophyll (20 ppm). The rate of reaction was pH dependent, being faster at alkaline pH and almost negligible in acidic solutions. Under optimal experimental conditions the photooxidation was completed after about 1 hour, and further irradiation resulted in the decomposition of the intermediate products and the formation of unidentified polar products.Irradiation of an aerated bromacil (3-sec-butyl-5-bromo-6-methyluracil) aqueous solution (250 ppm), by exposure to direct solar radiation in the presence of different dye-sensitizers and an appropriate pH, led to complete and fast photodecomposition of the title compound. The photoreaction mixture spotted on TLC showed one major intermediate, 3-sec-butyl-2-acetyl-2-hydroxy-hydantoin. GLC showed another, minor, intermediate, the 5,5 prime -dimer photo-product of 3-sec-butyl-6-methyluracil. The most effective dye sensitizers checked were riboflavin (10 ppm) and methylene blue (2 to 5 ppm). The rate of reaction was pH dependent, being faster at alkaline pH and almost negligible in acidic solutions. Under optimal experimental conditions the photooxidation was completed after about 1 hour.
Scientific Publication
You may also be interested in