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Degradation intermediates and reaction pathway of carbofuran in leaching water using TiO2 and ZnO as photocatalyst under natural sunlight

Paper ID Volume ID Publish Year Pages File Format Full-Text
26152 43937 2013 8 PDF Available
Title
Degradation intermediates and reaction pathway of carbofuran in leaching water using TiO2 and ZnO as photocatalyst under natural sunlight
Abstract

In this work the solar-photocatalytical degradation of carbofuran in leaching water has been studied using zinc oxide (ZnO) and different mixed-phase (rutile/anatase) titanium dioxide (TiO2) at pilot plant scale. Comparison of catalysts showed that ZnO is the most efficient for catalyzing the removal of carbofuran and their main organic intermediates. The residual levels of carbofuran at the end of the experiment (240 min) were 0.1, 22.4, 62.8, 68.4 μg L−1 for ZnO, TiO2 P25 Degussa (70A/30R), TiO2 rutile (25A/75R) and TiO2 anatase (90A/10R), respectively. The primary degradation of carbofuran followed pseudo-first order kinetics. The analysis and evolution of the intermediates suggest that oxidation of the CO bond on the carbamate group and 3C position of the furan ring as the main metabolic pathway.

Graphical abstractPhotocatalytic degradation pathway of carbofuran.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Heterogeneous photocatalytic oxidation of carbofuran in water. ► ZnO strongly enhanced photodegradation in comparison with TiO2. ► Four intermediates were identified by HPLC/MS/MS. ► A mechanism of degradation has been tentatively proposed.

Keywords
Water remediation; Carbofuran; Photocatalytic oxidation; Semiconductor materials
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Degradation intermediates and reaction pathway of carbofuran in leaching water using TiO2 and ZnO as photocatalyst under natural sunlight
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 251, 1 January 2013, Pages 33–40
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