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Defect-rich photocatalytic materials with excellent charge transfer properties are very popular. Herein, Sm-doped CeO 2 nanorods were annealed in a N 2 atmosphere to obtain the defective Sm-doped CeO 2 photocatalysts (Vo-Sm-CeO 2 ). The morphology and structure of Vo-Sm-CeO 2 were systematically characterized. The Vo-Sm-CeO 2 nanorods demonstrated an excellent photodegradation performance of methyl blue under visible light irradiation compared to CeO 2 nanorods and Sm-CeO 2 . Reactive oxygen species including OH, ·O 2  - , and h + were confirmed to play a pivotal role in the removal of pollutants via electron spin resonance spectroscopy. Doping Sm enhances the conductivity of CeO 2 nanorods, benefiting photogenerated electrons being removed from the surface reactive sites, resulting in the superior performance.

Defect Engineering Enhances the Charge Separation of CeO2 Nanorods toward Photocatalytic Methyl Blue Oxidation