Reverse Semi-Combustion Driven by Titanium Dioxide-Ionic Liquid Hybrid Photocatalyst

Muhammad I. Qadir, Marcileia Zanatta, José Pinto, Isabel Vicente, Aitor Gual, Emily F. Smith, Brenno A.D. Neto, Paulo E. N. de Souza, Sherdil Khan, Jairton Dupont, Jesum Alves Fernandes

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)5580-5585
Number of pages6
Issue number20
Publication statusPublished - 21 Oct 2020


  • carbon dioxide
  • carbon monoxide
  • ionic liquids
  • photocatalysis
  • titania


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