浅池型TiO2/ACF光催化降解水中苯酚的研究

为了提高光催化过程的降解速率，本文以涂覆法制得的二氧化钛/活性炭纤维（TiO2/ACF）为光催化剂，300 W(365 nm)高压汞灯为光源，研究了浅池型反应器中苯酚在TiO2/ACF上的光催化降解动力学；探讨了光强度、高压汞灯滤光以及光源种类对降解反应的影响，并对光氧化，光催化和吸附过程进行了比较。结果表明：光氧化对苯酚的降解无效果，光催化降解速率常数与吸附速率常数之比为3.35/1；光强越大，光催化降解速率越快；高压汞灯不滤光时光催化降解速率明显加快，但光催化反应仍遵循准一级反应动力学方程；波长为254 nm紫外杀菌灯的降解效果高于波长为365 nm高压汞灯滤光后的降解效果。

STUDY ON PHOTOCATALYTIC OXIDATION OF PHENOL IN WATER USING TiO2 IMMOBILIZED ONTO ACF IN A SHALLOW POND REACTOR

Photocatalytic oxidation of phenol in water was studied in a shallow pond reactor using TiO2 immobilized onto activated carbon fiber as photocatalyst. A 300 W high pressure Hg-lamp(365 nm) was used as light source. The influences of light intensity, light filter as well as different light sources on the photocatalytic process were investigated, and the comparison of photolysis, adsorption and photocatalysis was also conducted. The results showed that there was almost no oxidation of phenol in photolysis process, the ratio of the photocatalytic degradation rate constant and adsorption rate constant of phenol over TiO2 /ACF was 3.35/1; increasing Hg-lamp light intensity can improve the rate of oxidation; there was an apparent improvement of the photocatalytic rate under the irradiation of the high pressure Hg-lamp without filter, while the photocatalytic rate could be still described in terms of pseudo first order kinetics; the oxidation rate of high pressure Hg-lamp with a filter was lower than that of a UV germicidal lamp.