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Ordered nanocrystalline mesoporous cerium oxide was successfully synthesized using MCM-48 molecular sieves as a hard template. The long-range ordered mesostructure was characterized by low-angle and wideangle X-ray diffraction (XRD), N 2 adsorption-desorption technique, and transmission electron microscopy (TEM), and the obtained cerium oxide exhibited high similarity to the cubic Ia3d symmetry of the silica template. Due to smaller crystal size, the mesoporous materials have a blue shift in light absorption as compared with nonporous materials. X-ray photoelectron spectrum (XPS) and energy-dispersive X-ray spectrum (EDS) patterns confirm that mesoporous materials possess more surface vacancies than bulk CeO 2 . Photocatalytic degradation of azodye acid orange 7 under visible light illumination was used as a catalytic test reaction. The activity of mesoporous product in dye decolorization is substantially higher than those for a nonporous sample and TiO 2 P25.

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This paper presents an overview of the recent advances achieved on visible light-responsive TiO 2 -based photocatalysts. In order to provide a focal point, we will highlight the work on transition metal ion-doped TiO 2 and TiO 2 thin films prepared by an RF magnetron sputtering deposition method, as well as their corresponding photoactivities on such significant reactions as organic decomposition and water splitting. Some of their proposed mechanisms are presented together with experimental physicochemical evidence to support the conclusions.

Deadly cerias: The decomposition of organics in a CeO2/H2O2 system is achieved through their reaction with the interfacial peroxide species on CeO2. The reactivity however relies on a necessary level of Ce3+ for activation. The concentration of Ce3+ from the interfacial peroxide species was ensured by the reaction of adsorbed organics.

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