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Characterization of microwave effects on metal-oxide materials: Zinc oxide and titanium dioxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
47747 46481 2009 6 PDF Available
Title
Characterization of microwave effects on metal-oxide materials: Zinc oxide and titanium dioxide
Abstract

The microwave specific effect(s) that can impact a microwave-assisted and photo-assisted reaction occurring on the surface of ZnO or TiO2 (P-25) particles was (were) examined by comparing the process occurring under rich magnetic field conditions and under magnetic/electric field conditions. The features of the photo-assisted process in the presence of microwaves rich in a magnetic field (H) and an electric field (E) are described on the basis of (i) the degradation dynamics of 4-chlorophenol (4-CP) at ambient temperatures, (ii) the number of OH radicals produced, and (iii) the dielectric properties of the metal oxides (in pellet form). For ZnO, the photoactivity is enhanced by a microwave specific non-thermal (i.e. non-caloric) effect originating from the microwaves’ magnetic field, but decreased by the thermal (i.e. caloric) factor originating from the microwaves’ electric field. Contrary to ZnO, the photoactivity of TiO2 (P-25) was enhanced by the synergistic effect between the magnetic and electric fields of the microwave radiation. Photocorrosion of ZnO in the aqueous dispersions was negligibly small (less than 0.05%) under UV, MW-EH, and UV/MW-EH irradiation conditions.

Graphical abstractMicrowave specific effects originating from either the magnetic and/or electric field of the microwaves that may impact the photoactivity of TiO2 and ZnO have been examined in the photodegradation of the 4-chlorophenol toxin.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Microwaves; Photocatalyst; Magnetic field; Electric field; 4-Chlorophenol; ZnO; TiO2
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Characterization of microwave effects on metal-oxide materials: Zinc oxide and titanium dioxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 91, Issues 1–2, 7 September 2009, Pages 362–367
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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