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Solar photoactivity of nano-N-TiO2 from tertiary amine: role of defects and paramagnetic species

Paper ID Volume ID Publish Year Pages File Format Full-Text
47376 46470 2010 9 PDF Available
Title
Solar photoactivity of nano-N-TiO2 from tertiary amine: role of defects and paramagnetic species
Abstract

N-doped TiO2 nanocrystals were successfully synthesized by a controlled sol–gel reaction at pH 9 followed by calcinations at 400 °C. Triethylamine was used to modulate the N content of the samples. The photocatalytic activity was tested using a solar irradiation source with regard to two different pollutants: NOx (in the gas phase) and methylene blue (MB), deposited onto the oxide film. In the case of MB degradation the disappearance of the (MB) blue colour was measured directly onto the solid, by means of UV–vis-NIR diffuse reflectance spectroscopy. The final mineralization of the organic molecule was assessed by COD determinations. All N-doped samples produce a better removal of both pollutants than the undoped and commercial samples. By coupling structural (by X-ray synchrotron radiation) and morphological (HRTEM, BET, granulometry) characterizations with spectroscopic analyses (EPR and XPS), the presence of paramagnetic centers, defects, edge dislocations and surface states is appreciated and found to affect the material photocatalytic behaviour.

Keywords
N-doped nanotitania; Synchrotron radiation X-ray diffraction; NOx degradation; Unconventional methylene blue removal; Paramagnetic sites
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 96, Issues 3–4, 7 June 2010, Pages 314–322
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