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Hierarchically porous Ce/TiO 2 /graphitic carbon microsphere composites ( x Ce/TiO 2 /GCM, where x = 0.2, 1.0, 2.0, 5.0 mmol·L -1 ) were prepared for the first time by using a simple colloidal crystal template and characterized by X-ray diffraction, nitrogen adsorption and desorption, scanning electron microscopy, and ultraviolet-visible diffuse reflectance spectra. In addition, the photocatalytic activity of CO 2 reduction by H 2 O under simulated solar irradiation was studied. The results showed that the Ce/TiO 2 /GCM composite material was characterized by large porosity, high concentration of metal compounds and graphitized carbon matrix, and the content of acetone solvent having a great impact on its form. In terms of the photocatalytic CO 2 reaction, the CH 4 and CO productions were 4.587 and 357.851 μmol·g -1 , respectively. The 2Ce/TiO 2 /GCM photocatalyst gave the highest production rate for three products. Under simulated solar irradiation, the Ce/TiO 2 /GCM has excellent photocatalytic activity in the photoreduction of CO 2 from H 2 O, which was related to the special composition and the Ce/TiO 2 /GCM structure.

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Simple Preparation of Hierarchically Porous Ce/TiO2/Graphitic Carbon Microspheres for the Reduction of CO2 with H2O under Simulated Solar Irradiation