中文摘要：

采用自制的光化学反应箱（160L），在254nm光照射下，研究了光强、湿度、甲苯初始浓度对甲苯光降解效率的影响。实验发现，随着光强的增加，光降解效率逐渐增加；在较低湿度范围内，随着湿度的提高光降解效率逐渐提高，在较高湿度时，光降解效率随湿度增加而逐渐下降；随着甲苯初始浓度的增加，光降解效率逐渐降低。同时也对甲苯在紫外光照射下的光降解机理进行了初步的探讨。

英文摘要：

The effects of the illumination intensity, the relative humidity and the initial concentration on photodegradation of toluene under illuminated with 254 mn UV light were investigated in a homemade 160-liter chamber.It was found that the photodegradation efficiencies increased gradually with the increase of illumination intensity.But the photodegradation efficiencies increased at first within the low relative humidity, and then decreased with the further increase of the relative humidity. The photodegradation efficiencies decreased with the increase of the initial concentration of toluene. And the photodegradation reaction mechanism was also discussed in detail.