Reprint of Photocatalytic reduction of CO 2 on MgO/TiO 2 nanotube films" "

A facile development of highly efficient MgO/TiO 2 nanotubes network (MgO/TNTs) films is described.These MgO/TNTs films have a unique one-dimensional (1D) network nanotubular structure, and thedifferent contents of MgO existed as amorphous thin layers located on the surfaces of TiO 2 nanotubes.They exhibited excellent photoreduction efficiency of CO 2 to methane compared with the bare TiO 2 film.MgO plays a critical role in CO 2 methanation, because it has the strong adsorption ability of CO 2 andinitiates the reaction by binding a CO 2 molecule, forming a magnesium carbonate species on the surface.For further improve the photocatalytic activity, Pt nanoparticles were loaded on MgO/TNTs films bythe photo-reduction method. It was found that the loading of Pt notably improved the transformationefficiency of CO 2 to methane, and the highest evolution rate of methane reached 100.22 ppm/h cm2.The fast electron-transfer rate in MgO/TNTs film and the efficient electron-hole separation by the Ptnanoparticals were the main reasons for the enhancement of the photoreduction activity. The synergyeffect of Pt nanoparticles and MgO in the nanocomposites played an important role in CO 2 photoreduction. © 2014 Elsevier B.V. All rights reserved.