不同波段紫外光在TiO2悬浊液中的消光特点

为确定TiO₂催化剂悬浊液对不同波段紫外光的消光规律,本试验以4-CBA-Na为模型污染物,针对催化剂/污染物悬浊液体系在不同催化剂投加量下,对UVA、UVB和UVC波段光子的消光效果进行了测定.结果表明,各悬浮体系对各波段紫外光的消光基本上符合比耳定律,即随着入射光程的增加,光强呈现负指数衰减;紫外光在催化剂悬浊液中的消光系数随催化剂投加量的增大而增加,其增加规律可以用二次多项式表示;污染物溶液本身对UVB和UVC紫外光有吸收,UVB和UVC紫外光在催化剂-污染物悬浮体系中的消光系数可视为污染物与催化剂颗粒的消光系数之叠加.催化剂悬浊液对紫外光的消光系数随紫外光波长的减小而增大,这意味着使用短波长的UVC作为光催化降解光源可以提高能量利用效率.

Extinction Characteristics of TiO2 Suspension for Different Band Ultraviolet Radiation

This study focused on the global absorption characteristics of UVA, UVB and UVC radiation in the suspension of titanium pollutant solution using 4-CBA-Na as a model pollutant. The result showed that the attenuation of ultraviolet in the suspensions conformed to Beer's Law, light intensity negative exponentially attenuating with the optic path. The extinction coefficient increased with the titanium dosage by a quadratic polynomial law, which may be approximated by a linear function at lower dosage. The sum of the respective UVC or UVB extinction coefficient in pollutant solution and titanium-water suspension was found to approach the measured value in Titanium-Pollutant suspension. Larger extinction coefficient was observed for shorter UV wavelength, implying higher energy efficiency with UVC as ultraviolet source.