Photocatalytic Reduction of Carbon Dioxide over Quinacridone\nNanoparticles Supported on Reduced Graphene Oxide

Abstract

Photoreduction\nof carbon dioxide to chemicals or fuels is very\ninteresting from the viewpoint of green chemistry. Herein, we report\nthe photoreduction of CO₂ catalyzed by a metal-free photocatalyst:\nreduced graphene oxide (rGO) supported quinacridone (QA) particles\n(QA/rGO), which were prepared via aggregation of QA on the surface\nof GO through forming H-bonding with GO. The resultant QA/rGO composites\nexhibited improved activity for CO₂ photocatalytic reduction\nusing TEOA as a sacrifice reagent under ultraviolet light irradiation;\nespecially, the composite with rGO content of 2 wt % (i.e., QA/rGO-2)\nproduced CO and CH₄ with rates of 450 and 275 μmol\ng^–1 h^–1, respectively. It was\nindicated that the QA particles served as photosensitizer and photocatalyst,\nand the rGO nanosheets promoted the transfer of the photogenerated\ncarriers and their separation, thus improving the catalytic activity\nof QA for catalyzing CO₂ reduction.