太阳光下高光催化活性Pr-N-P三元掺杂锐钛矿TiO2纳米片

利用溶胶-凝胶和溶剂热联合技术制备了Pr-N-P三元掺杂锐钛矿TiO₂（PrNPTO）纳米片，并采用X射线衍射、透射电镜、N₂吸附、X射线光电子能谱、UV-vis吸收谱和光致荧光光谱分析技术对其进行了表征.当Pr掺杂量为1.75wt%，焙烧温度为550℃时，制得的PrNPTO在可见和紫外光下光催化降解亚甲基蓝（MB）活性最佳.在模拟太阳光照射下，PrNPTO也表现出优越的光催化降解4-氯酚性能（k_app=3.90×10^-2min^-1），优于未掺杂、单掺杂和双掺杂TiO₂样品，其光活性是P25TiO₂的3.33倍（k_app=1.17×10^-2min^-1）.PrNPTO光活性的提高归因于Pr-N-P三元掺杂增强了紫外和可见光吸收，降低了光生载流子复合，增加了表面羟基以及改善了表面织构特性.在模拟太阳光照射下，PrNPTO光催化效率高且光催化性能稳定，适合于环境净化领域的实际应用.

Pr,N, and P tri-doped anatase TiO2 nanosheets with enhanced photocatalytic activity under sunlight

Pr, N, and P tri-doped anatase TiO₂ nanosheets (PrNPTO) were synthesized by a combined sol-gel solvothermal method and characterized by X-ray diffraction, transmission electron microscopy, N₂ adsorption-desorption, X-ray photoelectron spectroscopy, UV-vis absorbance spectroscopy, and photoluminescence spectroscopy. When the Pr-doping concentration was 1.75 wt% and calcination temperature employed was 550℃, the resulting PrNPTO showed the highest photoactivity towards the degradation of methylene blue under visible and UV light irradiation. PrNPTO also displayed superior photoactivity towards the degradation of 4-chlorophenol under sunlight (k_app=3.90×10^-2 min^-1) over the non-doped, single-doped, and co-doped samples, and P25 TiO₂ (k_app =1.17×10^-2 min^-1). The high photoactivity of PrNPTO was attributed to the increased UV and visible light absorption properties, reduced recombination of photogenerated carriers, increased surface hydroxyl content, and improved surface textural properties. PrNPTO was highly efficient and stable under simulated sunlight irradiation, which are essential attributes for practical application in environment-related remediation schemes.