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Schematic illustration of the photocatalysus mechanism of carbon nanomaterial–TiO2 composites: (a) fullerene/TiO2 composite; (b) carbon nanotube/TiO2 composite; (c) graphene material/TiO2 composite; and (d) g-C3N4/TiO2 composite. Reprinted from [9] with permission from Elsevier.
