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研究了NH3处理温度对N掺杂P25-TiO2可见光催化活性的影响以及可见光催化活性与表面组成和结构的关系.实验结果表明:NH3处理温度在600℃时,有最高活性;在700℃,P25-TiO2转变为以金红石相为主,表面未发生N掺杂,这与700℃时NH3分解有关;N掺杂浓度、可见光吸收两者与可见光催化活性之间均不存在顺变关系.讨论揭示:N掺杂P25-TiO2的可见光催化活性是由三个要素协同作用产生:(i)表面生成大量束缚单电子氧空位(Vo·),(ii)表面有N掺入,(iii)晶型以锐态矿为主,三者缺一不可.
The effect of NH3 treatment temperature on the visible light catalytic activity of N-doped P25-TiO2 and the relationship between the visible light photocatalytic activity and the surface composition and structure were investigated. The experimental results show that the NH3 treatment temperature has the highest activity at 600 ℃; at 700 ℃, P25 -TiO2 was changed to rutile phase without N doping on the surface, which was related to the decomposition of NH3 at 700 ℃ .Non-doping concentration and visible light absorption had no relationship with visible light photocatalytic activity.The discussion revealed: Visible photocatalytic activity of N-doped P25-TiO2 is generated by the synergistic action of three elements: (i) a large amount of bound single electron oxygen vacancies (Vo ·) on the surface, (ii) N incorporation on the surface, and Rui state-based mine, the three indispensable.