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Photodegradation of thiacloprid using Fe/TiO2 as a heterogeneous photo-Fenton catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
46894 46452 2011 9 PDF Available
Title
Photodegradation of thiacloprid using Fe/TiO2 as a heterogeneous photo-Fenton catalyst
Abstract

Three Fe/TiO2 photocatalysts with different content of Fe (1.9, 7.2 and 13.9%, w/w) were synthesized by a simple deposition–precipitation method and characterized by XRD, SEM, N2 physisorption at 77 K and Mössbauer spectroscopy. The characterization showed the presence of nano-sized Fe2O3 particles (less than 4 nm) on the TiO2 support. The photocatalytic efficiency of the catalysts was examined on the example of thiacloprid (TCL) degradation under UV light irradiation in aqueous suspension in the presence/absence of H2O2. Since the efficiency of TCL degradation in the presence of H2O2 (heterogeneous photo-Fenton process) was more than two times higher, all other investigations were conducted in the presence of H2O2. The photocatalyst with 7.2%, w/w Fe (denoted as 7.2Fe/TiO2) appeared to be most efficient. The photocatalytic degradation studied under different operating conditions indicated that 0.5 g L−1 of 7.2Fe/TiO2 was an optimal catalyst loading, and the optimal pH was 2.8. In the investigated range of initial concentrations of TCL (0.06–0.32 mM) the photocatalytic degradation in the first stage of the reaction followed approximately a pseudo-first order kinetics. The suspended Fe/TiO2 spontaneously precipitated once the stirring of the reaction mixture was terminated (>90% after 15 min). The results clearly demonstrated that 7.2Fe/TiO2 was stable and resistant to photocorrosion during the photocatalytic degradation of TCL. The higher efficiency of 7.2Fe/TiO2 compared to Degussa P25 under the optimal experimental conditions of TCL photodegradation, spontaneous precipitation of the suspension, possibility of reusing the catalyst, as well as an insignificant increase in the iron concentration in water solution, all this indicates the possibility of the practical application of this photocatalyst for water treatment.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Fe/TiO2 samples with different Fe content were prepared using deposition–precipitation method. ► Fe/TiO2 with 7.2%, w/w Fe exhibited the highest degradation efficiency of TC under UV light irradiation in the presence H2O2. ► There was no loss of photocatalytic ability in three successive runs each of which lasted 5 h. ► Fe/TiO2 was stable and resistant to photocorrosion during the photocatalytic degradation of TC.

Keywords
Thiacloprid; Neonicotinoid pesticides; Fe/TiO2; Heterogeneous photo-Fenton; Pollution control
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 107, Issues 3–4, 21 September 2011, Pages 363–371
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