Journal
ACS CATALYSIS
Volume 5, Issue 12, Pages 7424-7431Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b01562
Keywords
rutile; anatase; titanium dioxide; oxygen activation; photocatalysis
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Funding
- Foundation for Polish Science [TEAM/2012-9/4]
- Regional Development Fund of the European Union
- Polish Ministry of Science and Higher Education [N N204 016739, W13/7.PR/2013]
- EU-FP7 4G-PHOTOCAT [309636]
- European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program [POIG.02.01.00-12-023/08]
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The rutile form of titanium dioxide (r-TiO2) usually shows a photocatalytic activity lower than that of anatase-Ti-2 (a-TiO2). Nevertheless, there are numerous examples of sometimes unexpectedly high activity of r-TiO2. This material may appear to be particularly useful when a noncomplete and selective photocatalytic oxidation of organic substrates is required. On the basis of literature examples and our own studies, we compare the photocatalytic activities of r-TiO2, a-TiO2, and r-TiO2/a-TiO2 composites. Because of a significantly better oxygen adsorption at the surface of r-TiO2 and a lower redox potential of the excited electron, more efficient O-2 takes place at the surface of rutile. As a consequence, generation of 102 (involving O-2 reduction and the subsequent oxidation of superoxide) and reduction of H2O2 to OH- and HO are also favored with this material. Therefore, r-TiO2 can be considered to be a particularly good photocatalyst for activation of molecular oxygen. On the other hand, a-TiO2 appears to be a stronger oxidant. In its presence, efficient HO generation (the result of water or surface hydroxyl group oxidation) and oxidation of H2O2 to are observed.
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