TiO_2光-热催化降解有机污染物的初步研究

Preliminary Research on TiO_2 Thermo-photocatalytic Degradation of Organic Pollutants

从光催化过程与热催化过程结合形成高效光催化反应技术入手,初步探究在固液相光催化反应中温度对有机污染物降解效果的影响.通过系列试验及结果分析表明:以活性紫溶液为模拟有机污染物废水的光热催化降解试验中,当加热时在反应后期会出现去除率下降的现象,说明热催化过程对于降解有机物的反应速率存在一定影响,并有一定的贡献;溶液的酸碱性对反应的降解效果存在影响,且降解反应条件选择酸性环境更加适宜;光热耦合催化氧化试验组的反应时间明显缩短,且降解效果皆优于单一光催化反应和单一热催化反应,因此光热耦合降解反应中的光热催化并不是光催化与热催化的简单叠加,而是存在协同作用.

Based on the effective photocatalytic technology which combined photocatalytic process with thermal catalytic process, this paper explored the degradation effect of the temperature in organic pollutants in the solid-liquid phase photo catalytic reaction. The result of experiments showed that, in the process of thermo-photo catalytic degradation experiments where the reactive purple reaction were used as a series of simulated waste water, the heating would make removal rate decline in the late reaction, which indicated that thermal catalytic process have a certain impact on the reaction rate of the organic pollutants degradation; meanwhile, the acid and alkaline environment of reaction system affected experiments results, and the acidic environment was good at the reaction; the experimental group of thermal coupling catalytic oxidation significantly shorten the reaction time, and the effects are better than single photo catalytic degradation or single thermal catalytic reaction, therefore, the coupled thermal catalysis in the degradation reaction was not the simple sum of photo and thermal catalytic, but were synergetic.