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Semiconductor oxides-sensitized photodegradation of fenamiphos in leaching water under natural sunlight

Paper ID Volume ID Publish Year Pages File Format Full-Text
46403 46439 2012 7 PDF Available
Title
Semiconductor oxides-sensitized photodegradation of fenamiphos in leaching water under natural sunlight
Abstract

The photocatalytic degradation of fenamiphos in leaching water has been studied using zinc oxide (ZnO), different mixed-phase titanium dioxide (TiO2), tungsten(VI) oxide (WO3), and tin(IV) oxide (SnO2) at pilot plant scale under natural sunlight. Photocatalytic experiments showed that the addition of semiconductors in tandem with the oxidant (Na2S2O8) strongly enhances the degradation rate of fenamiphos in comparisons carried out with photolytic tests. The primary degradation of fenamiphos followed a pseudo-first order kinetics. The time required for 50% degradation was in the range 1–3 min for ZnO and TiO2. The main photocatalytic intermediates (fenamiphos-sulfoxide and fenamiphos sulfone) detected during the degradation of fenamiphos were identified. Comparison of catalysts showed that ZnO is the most efficient for catalyzing the removal of fenamiphos and their metabolites. Thus, complete disappearance of all the compounds studied achieved after 240 min of illumination in the ZnO/Na2S2O8 system.

Graphical abstractPhotocatalytic degradation of fenamiphos in leaching water by using semiconductor oxides. ZnO was the most efficient for catalyzing the removal of fenamiphos and its metabolites. Total degradation of fenamiphos derivatives was achieved for the tandem ZnO/Na2S2O8.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Heterogeneous photocatalytic oxidation of fenamiphos in water. ► ZnO and TiO2 strongly enhanced photodegradation in comparison with WO3 and SnO2. ► Half-lives for fenamiphos in the presence of ZnO and TiO2 were about 1–3 min. ► Complete disappearance of fenamiphos metabolites was achieved only in the presence of ZnO.

Keywords
Water detoxification; Fenamiphos; Fenamiphos sulfoxide; Fenamiphos sulfone; Photocatalytic oxidation; Semiconductor materials
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 31–37
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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