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通过机械化学方法对纳米TiO2进行掺氮改性后,研究了煅烧温度和煅烧时间对纳米TiO2在模拟日光条件下光催化氧化NO2性能的影响。结果表明,当煅烧温度为500℃时,光催化效率随煅烧时间的延长而增加;但当煅烧温度为600和700℃时,光催化效率随煅烧时间的延长而降低,这主要是由于煅烧温度的增加使得纳米TiO2由锐钛矿型转变为金红石型。当煅烧温度为500℃时,煅烧时间从3h延长到5h,光催化效率从51.5%提高到67.0%,这是P25光催化效率的135%。
The effects of calcination temperature and calcination time on the photocatalytic oxidation of NO2 under simulated sunlight conditions were investigated by means of mechanochemical method. The results showed that the photocatalytic efficiency increased with the calcination time when the calcination temperature was 500 ℃. When the calcination temperature was 600 and 700 ℃, the photocatalytic efficiency decreased with calcination time, which was mainly due to the calcination temperature The increase makes the nano-TiO2 from anatase to rutile. When the calcination temperature is 500 ℃, the calcination time is prolonged from 3h to 5h, the photocatalytic efficiency increases from 51.5% to 67.0%, which is 135% of P25 photocatalytic efficiency.