Li Xijuan, Zheng Hongjuan, Wang Yulong, Li Xia, Liu Jinsong, Yan Kang, Wang Jing, Zhu Kongjun
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Nanomaterials (Basel). 2023 Aug 7;13(15):2266. doi: 10.3390/nano13152266.
Pure TiO and 3% Y-doped TiO (3% Y-TiO) were prepared by a one-step hydrothermal method. Reduced TiO (TiO-H) and 3% Y-TiO (3% Y-TiO-H) were obtained through the thermal conversion treatment of Ar-H atmosphere at 500 °C for 3 h. By systematically comparing the crystalline phase, structure, morphological features, and photocatalytic properties of 3% Y-TiO-H with pure TiO, 3% Y-TiO, and TiO-H, the synergistic effect of Y doping and reduction of TiO was obtained. All samples show the single anatase phase, and no diffraction peak shift is observed. Compared with single-doped TiO and single-reduced TiO, 3% Y-TiO-H exhibits the best photocatalytic performance for the degradation of RhB, which can be totally degraded in 20 min. The improvement of photocatalytic performance was attributed to the synergistic effect of Y doping and reduction treatment. Y doping broadened the range of light absorption and reduced the charge recombination rates, and the reduction treatment caused TiO to be enveloped by disordered shells. The remarkable feature of reduced TiO by H is its disordered shell filled with a limited amount of oxygen vacancies (Os) or Ti, which significantly reduces the E of TiO and remarkably increases the absorption of visible light. The synergistic effect of Y doping, Ti species, and Os play an important role in the improvement of photocatalytic performances. The discovery of this work provides a new perspective for the improvement of other photocatalysts by combining doping and reduction to modify traditional photocatalytic materials and further improve their performance.
采用一步水热法制备了纯TiO和3% Y掺杂TiO（3% Y-TiO）。通过在500℃的Ar-H气氛中进行3小时的热转化处理，得到了还原TiO（TiO-H）和3% Y-TiO（3% Y-TiO-H）。通过系统比较3% Y-TiO-H与纯TiO、3% Y-TiO和TiO-H的晶相、结构、形态特征和光催化性能，获得了Y掺杂和TiO还原的协同效应。所有样品均呈现单一的锐钛矿相，未观察到衍射峰位移。与单掺杂TiO和单还原TiO相比，3% Y-TiO-H对RhB的降解表现出最佳的光催化性能，在20分钟内可将其完全降解。光催化性能的提高归因于Y掺杂和还原处理的协同效应。Y掺杂拓宽了光吸收范围并降低了电荷复合率，还原处理使TiO被无序壳层包裹。H还原TiO的显著特征是其无序壳层中填充了有限量的氧空位（Os）或Ti，这显著降低了TiO的E值并显著增加了对可见光的吸收。Y掺杂、Ti物种和Os的协同效应在光催化性能的提高中起重要作用。这项工作的发现为通过结合掺杂和还原改性传统光催化材料以进一步提高其性能来改进其他光催化剂提供了新的视角。
