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Reverse Semi-Combustion Driven by Titanium Dioxide-Ionic Liquid Hybrid Photocatalyst
Muhammad I Qadir1,2, Marcileia Zanatta1,3, Jose Pinto4
1Institute of Chemistry, Federal University of Rio Grande do Sul, Campus Agronomia, Porto Alegre, 90650-001, Brazil.
Abstract:
Unprecedented metal-free photocatalytic CO2 conversion to CO (up to 228±48 μmol g-1 h-1) was displayed by TiO2@IL hybrid photocatalysts prepared by simple impregnation of commercially available P25-titanium dioxide with imidazolium-based ionic liquids (ILs). The high activity of TiO2@IL hybrid photocatalysts was mainly associated to (i) TiO2@IL red shift compared to the pure TiO2 absorption, and thus a modification of the TiO2 surface electronic structure; (ii) TiO2 with IL bearing imidazolate anions lowered the CO2 activation energy barrier. The reaction mechanism was postulated to occur via CO2 photoreduction to formate species by the imidazole/imidazole radical redox pair, yielding CO and water.
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