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In this paper, the phenol mineralization by Ce 3 + -doped CeO 2 by photocatalysis at room temperature, is shown for the first time. The photocatalytic behavior of CeO 2 was improved through the incorporation of Ce 3 + into its crystalline lattice. The materials were prepared by the precipitation method at low temperatures varying the Ce 4 + :Ce 3 + molar ratio of the precursors during the synthesis process. It is worth noting that, the synthesized photocatalysts did not carry out a thermal treatment after their preparation. The results obtained from Raman analysis demonstrated the formation of oxygen vacancies by the incorporation of Ce 3 + . The improvement of the photocatalytic activity was attributed to an optimal content of Ce 3 + which promoted structural defects (such as oxygen vacancies). Radical species, such as O 2 * À , are mainly formed during the photocatalytic process, which are probably the main responsible for inducing the mineralization process of the studied pollutant.

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