A series of CeO₂ photocatalysts were synthesized through the molten salt method. The photocatalytic activity was evaluated through the degradation of methyl orange (MO). Systematic characterizations including X-ray diffraction, Scanning electron microscopy, Fourier transformed infrared, X-ray photoelectron spectroscopy, Raman spectroscopy, electron spin-resonance spectroscopy, UV–vis diffuse reflectance spectroscopy, photoluminescence spectrometry, photocurrent response and electrochemical impedance spectroscopy were conducted to study the as-prepared CeO₂ samples. It was found that, under ultraviolet light irradiation, the apparent rate constants of CeO₂ prepared at 800 °C for degradation of MO was about 3.4 times higher than CeO₂ prepared at 500 °C. CeO₂ prepared at 800 °C held the higher oxygen vacancies concentration. According to the trapping experiments, it was demonstrated that photo-generated holes played a dominant role in this photocatalytic system. Furthermore, the possible photocatalytic mechanism which showed the roles of photo-generated holes and oxygen vacancies was proposed.

通过熔融盐法合成了一系列CeO ₂光催化剂。通过甲基橙（MO）的降解评估了光催化活性。进行了系统表征，包括X射线衍射，扫描电子显微镜，傅立叶变换红外光谱，X射线光电子能谱，拉曼光谱，电子自旋共振光谱，紫外可见漫反射光谱，光致发光光谱，光电流响应和电化学阻抗光谱。研究所制备的CeO ₂样品。发现在紫外线照射下，在800℃下制备的用于降解MO的CeO ₂的表观速率常数比CeO ₂高约3.4倍。在500°C下制备。在800°C下制备的CeO ₂保持较高的氧空位浓度。根据诱捕实验，证明光生空穴在该光催化体系中起主要作用。此外，提出了可能的光催化机理，该机理表明了光生空穴和氧空位的作用。