A series of cerium-doped TiO₂ anatase-brookite polymorphs with different low Ce contents (0.2–1.5 atomic %) were synthesized by a facile hydrothermal method as efficient visible-light-driven photocatalysts. Then, the surface fluorination of the Ce-TiO₂ photocatalyst with optimum Ce content (0.5%Ce-TiO₂) was studied further to increase its efficiency, particularly in high humid conditions. After coating of the synthesized photocatalysts on nickel foam, their photocatalytic performance was investigated in a continuous-flow reactor with small residence time through methyl ethyl ketone (MEK) degradation. Based on the characterization results, using an appropriate amount of Ce dopant and surface fluorination can significantly inhibit the charge carrier recombination. A significant improvement (about 4 times) in visible-driven photocatalytic activity has been demonstrated for F-0.5%Ce-TiO₂ compared to P25. Specifically, the surface fluorination promoted the 0.5%Ce-TiO₂ photoactivity in high humid conditions (e.g., 40% and 60%). After surface fluorination, removal efficiency of 0.5%Ce-TiO₂ at RH = 60% improved from 52% to 60% under UV and from 47% to 54% under visible light irradiation. The MEK removal efficiency for one-layer and three-layer of 0.5%Ce-TiO₂ photocatalyst are respectively 62% and 79% under UV, and 56% and 75% under visible light irradiation. Notably, the by-product generation was considerably decreased and reached the lowest amount for the three-layer F-0.5%Ce-TiO₂ photocatalyst.

通过简便的水热法合成了一系列铈含量不同的低铈含量（0.2-1.5原子％）的铈掺杂TiO ₂锐钛矿-板钛矿多晶型物，作为有效的可见光驱动光催化剂。然后，对具有最佳铈含量（0.5％Ce-TiO ₂的Ce-TiO ₂光催化剂）进行表面氟化处理）进行了进一步研究，以提高其效率，特别是在高湿度条件下。将合成的光催化剂涂覆在泡沫镍上后，在连续流反应器中通过甲乙酮（MEK）降解，以短停留时间研究了它们的光催化性能。根据表征结果，使用适量的Ce掺杂剂和表面氟化可显着抑制电荷载流子复合。与P25相比，F-0.5％Ce-TiO _2的可见光驱动的光催化活性得到了显着改善（约4倍）。具体而言，在高湿条件下（例如40％和60％），表面氟化促进了0.5％Ce-TiO _2的光活性。表面氟化后，去除率为0.5％Ce-TiORH = 60％时的₂从UV下的52％提高到60％，在可见光照射下从47％提高到54％。一层和三层0.5％Ce-TiO ₂光催化剂的MEK去除率在紫外线下分别为62％和79％，在可见光照射下分别为56％和75％。值得注意的是，对于三层F-0.5％Ce-TiO ₂光催化剂，副产物的产生显着减少并达到最低量。