Photocatalytic Reduction of CO2Using TiO2-Graphene Nanocomposites

TiO 2 -graphene (TiO 2 -RGO) nanocomposites were prepared via a simple chemical method by using graphene oxide (GO) and TiO 2 nanoparticles as starting materials. The morphologies and structural properties of the as-prepared composites were characterized by X-ray diffraction, Raman spectroscopy, N 2 adsorption-desorption measurements, and transmission electron microscopy. TiO 2 -RGO nanocomposites exhibited great photocatalytic activity toward reduction of CO 2 into CH 4 (2.10 μ mol g −1 h −1 ) and CH 3 OH (2.20 μ mol g −1 h −1 ), which is attributed to the synergistic effect between TiO 2 and graphene.