Preparation of Co-doped TiO2 for Photocatalytic Degradation of NOx in Air under Visible Light
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Nicklas Bengtsson
,
Marta Castellote
Abstract
Co-doped visible light active photocatalysts were obtained by chemical modification of TiO2 by carbon, nitrogen and sulphur. The method used for the synthesis employed titanium isopropoxide as precursor and thiourea as dopant source, provided that it contains the three species of interest (N, C and S). The influence of calcination temperature and initial thiourea content on the inclusion of dopants and photocatalytic activity was investigated. A red-shift in the absorption spectra was observed for the obtained catalysts. It was probed by XPS the presence of the three dopants not only on the surface of the catalyst but also in the bulk of the matrix. All the catalysts showed activity for NO degradation under visible and ultraviolet light. NO2 was formed as an undesirable intermediate and was not totally mineralized during the photocatalytic oxidation. Nitrogen as dopant appeared to be crucial factor to obtain visible light activity.
© 2016 by Walter de Gruyter Berlin/Boston
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- Depletion of Several Antibiotics Used in Industrial Process Using Immobilized TiO2
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- Rhodamine B Discolouration on TiO2 in the Cement Environment: A Look at Fundamental Aspects of the Self-cleaning Effect in Concretes
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