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Semiconductor-sensitized photodegradation of s-triazine and chloroacetanilide herbicides in leaching water using TiO2 and ZnO as catalyst under natural sunlight

Paper ID Volume ID Publish Year Pages File Format Full-Text
28168 44062 2012 7 PDF Available
Title
Semiconductor-sensitized photodegradation of s-triazine and chloroacetanilide herbicides in leaching water using TiO2 and ZnO as catalyst under natural sunlight
Abstract

In the present study, the photocatalytic degradation of five s-triazine (simazine, prometryn, terbutryn, atrazine and terbuthylazine) and three chloroacetanilide (propachlor, s-metolachlor, alachlor) herbicides in leaching water has been investigated. Zinc oxide (ZnO) and titanium dioxide (TiO2) were used as semiconductors at pilot plant scale under natural sunlight. The addition of an oxidant (Na2S2O8) to the semiconductor suspensions led to an increase in the rate of photooxidation. Comparison of catalysts showed that ZnO was the most efficient for catalyzing the removal of the studied compounds. Thus, more than 70% of the herbicide amount initially present in the leaching water was degraded after 240 min of illumination in the ZnO/Na2S2O8 system. Finally, some hydroxy and dealkylated derivatives of s-triazine herbicides were isolated during the experiment.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Heterogeneous photocatalytic oxidation of herbicides in water. ► ZnO and TiO2 strongly enhanced photodegradation in comparison with photolysis. ► ZnO was the most efficient for catalyzing the removal of these compounds. ► Hydroxy and dealkylated derivatives of triazine herbicides were isolated.

Keywords
Water detoxification; s-Triazines; Chloroacetanilide; Photocatalytic oxidation; Semiconductor materials
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Semiconductor-sensitized photodegradation of s-triazine and chloroacetanilide herbicides in leaching water using TiO2 and ZnO as catalyst under natural sunlight
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 238, 15 June 2012, Pages 81–87
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