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Heterogeneous and homogeneous photocatalytic degradation of the insecticide imidacloprid in aqueous solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
48059 46490 2009 9 PDF Available
Title
Heterogeneous and homogeneous photocatalytic degradation of the insecticide imidacloprid in aqueous solutions
Abstract

The heterogeneous and homogeneous photocatalytic degradation of imidacloprid, a systemic chloronicotinoid insecticide, has been investigated in aqueous solutions using artificial UV-A or visible illumination. Three processes under various experimental conditions were evaluated namely, TiO2/UV-A, photo-Fenton/UV-A and photo-Fenton/vis with respect to their activity for substrate degradation and mineralization. The initial apparent photonic efficiency decreased in the order photo-Fenton/UV-A > TiO2/UV-A > photo-Fenton/vis. For the TiO2/UV-A process, the efficiency increased considerably when TiO2 is combined with Fe3+ and H2O2 presumably due to the synergistic effect of homogeneous and heterogeneous photocatalytic reaction. On the other hand, the homogeneous photocatalytic reactions were enhanced in the presence of the oxalate ions. Imidacloprid degradation was accompanied by the formation of several reaction by-products as confirmed by GC/MS analysis, while ammonium, nitrate and chloride ions have been detected in the liquid phase as mineralization products. By-products were less ecotoxic to marine bacteria than the insecticide itself.

Keywords
Photocatalysis; Imidacloprid; TiO2; Photo-Fenton; Intermediates; Toxicity
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Heterogeneous and homogeneous photocatalytic degradation of the insecticide imidacloprid in aqueous solutions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 86, Issues 1–2, 2 February 2009, Pages 27–35
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