Abstract N-doped anatase-rutile titanium dioxide (N-TiO2) is a classical semiconductor widely used in environmental remediation. Its photocatalytic performance is typically affected by its morphology, porous structure, and phase composition. Herein, disk-like mesoporous N-TiO2 was prepared by calcining MIL-125(Ti) and melamine matrix at different temperatures in air. The photocatalytic efficiency of the prepared mesoporous N-TiO2 for the photo-oxidation of gaseous benzene under visible-light irradiation was studied. With respect to light absorption and mass transfer, as-prepared N-TiO2 annealed at 500 °C (MM-500) showed the best photocatalytic activity with corresponding photodegradation and mineralization efficiencies of 99.1% and 72.0%, respectively. In addition, MM-500 exhibited excellent reusability and stability in cyclic experiments, in which 84.8% of gaseous benzene could still be photodegraded after 10 experimental cycles. Furthermore, electron spin resonance analysis indicated that •OH and •O2− radicals were the dominating reactive oxygen species during the photo-oxidation process. Their excellent performance suggests that the as-prepared N-TiO2 photocatalysts can be used to eliminate volatile organic compounds.

中文翻译：

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使用源自 MIL-125(Ti) 的介孔盘状 N-TiO2 进行稳健的光催化苯降解

摘要 N掺杂锐钛矿-金红石型二氧化钛（N-TiO2）是一种广泛应用于环境修复的经典半导体。其光催化性能通常受其形态、多孔结构和相组成的影响。在此，通过在空气中不同温度下煅烧 MIL-125(Ti) 和三聚氰胺基质制备了盘状介孔 N-TiO2。研究了制备的介孔N-TiO2在可见光照射下对气态苯光氧化的光催化效率。在光吸收和传质方面，所制备的 N-TiO2 在 500 °C (MM-500) 下退火显示出最佳的光催化活性，相应的光降解和矿化效率分别为 99.1% 和 72.0%。此外，MM-500在循环实验中表现出优异的可重用性和稳定性，其中 84.8% 的气态苯在 10 个实验循环后仍可光降解。此外，电子自旋共振分析表明，•OH 和•O2- 自由基是光氧化过程中的主要活性氧。它们的优异性能表明所制备的 N-TiO2 光催化剂可用于消除挥发性有机化合物。