Abstract

The photocatalytic properties of titanium dioxide have been widely studied over recent decades since the discovery of water photolysis by TiO2 electrodes in 1972. Titanium dioxide has three main crystal polymorphs; anatase, rutile and brookite and rutile is the most common as the metastable polymorph. Each polymorph has different band gap positions. Anatase’s band gap is 3.2 eV, higher than rutile’s which is 3.0 eV. This difference in the band gap will determine their optimum UV wavelength range to promote a photocatalytic process. There are different methods to assess the photocatalytic activity of a material. The most commonly used method is the degradation of a dye in aqueous solution under UV light, due to its simplicity. Under these conditions the decomposition rate of a suitable organic dye is used as a measure of activity. Physical properties such as particle size and surface area will determine the effective area that will interact and absorb the dye prior to degradation. The physical mechanisms involved in such aqueous based methods differ from gas phase reactions. More advanced techniques use mass spectrometers to evaluate photocatalytic activity of titanium dioxide in the gas phase. An effective photocatalyst for heterogeneous reactions in the gas phase is one which is efficient at creating radicals as a result of an absorbed photon.
LanguageEnglish
Title of host publicationNanotechnology and Nanomaterials "Semiconductor Photocatalysis - Materials, Mechanisms and Applications"
Pages613
Number of pages23
ISBN (Electronic)978-953-51-2483-2, Wenbin Cao
DOIs
StatusPublished - Aug 2016

Fingerprint

Pollution control
Powders
Polymorphism
Energy gap
Coloring Agents
Gases
titanium dioxide
Degradation
Photolysis
Mass spectrometers
Photocatalysts
Ultraviolet radiation
Photons
Physical properties
Particle size
Decomposition
Wavelength
Crystals
Electrodes
Water

Keywords

  • photocatalysis, UV irradiation, nitrogen dioxide, methylene blue reduction, mass spectrometer

Cite this

Nuño, M., Ball, R., & Bowen, C. (2016). Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control. In Nanotechnology and Nanomaterials "Semiconductor Photocatalysis - Materials, Mechanisms and Applications" (pp. 613) https://doi.org/10.5772/62894

Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control. / Nuño, Manuel; Ball, Richard; Bowen, Christopher.

Nanotechnology and Nanomaterials "Semiconductor Photocatalysis - Materials, Mechanisms and Applications". 2016. p. 613.

Research output: Chapter in Book/Report/Conference proceedingChapter

Nuño, M, Ball, R & Bowen, C 2016, Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control. in Nanotechnology and Nanomaterials "Semiconductor Photocatalysis - Materials, Mechanisms and Applications". pp. 613. https://doi.org/10.5772/62894
Nuño M, Ball R, Bowen C. Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control. In Nanotechnology and Nanomaterials "Semiconductor Photocatalysis - Materials, Mechanisms and Applications". 2016. p. 613 https://doi.org/10.5772/62894
Nuño, Manuel ; Ball, Richard ; Bowen, Christopher. / Photocatalytic Properties of Commercially Available TiO2 Powders for Pollution Control. Nanotechnology and Nanomaterials "Semiconductor Photocatalysis - Materials, Mechanisms and Applications". 2016. pp. 613
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