COMPARATIVE BETWEEN HETEROGENEROUS PHOTOCATALYTIC OXIDATION AND DIRECT PHOTOLYSIS OF PHENOL IN AQUEOUS SOLUTION
在TiO2催化剂上苯酚光催化氧化反应研究2-多相光催化氧化与直接光解反应的比较

Comparison between heterogeneous photocatalytic oxidation with TiO2 slurry and direct photolysis of phenol have been investigated by means of monitoring the total carbon concentration and starting material during the reaction processes.The results clearly indicated that both processes followed different pathways.In photocatalysis oxidation the phenol was degraded into smaller molecular compounds.In contrast, in direct photolysis the dimmer or polymer reactions of phenol were brought as evidence showing that moleculars of the products are bigger than starting material.The influences of reaction conditions such as catalysts dose, the oxygen concentration, and illumination intensity on the reaction rate were investigated.In addition, it was shown that in visible light region the reaction rate of the photocatalytic oxidation is much faster than that of the direct photolysis, indicating the advantage of developing solar photocatalytic oxidation facilities for commercial applications on wastewater treatment.