Effects of Flow Pattern and Extinction Coefficient on Photocatalytic Degradation of Organic Compounds with TiO_2 Thin Film
Shi Zaifeng, Xuechang Ren · China Water & Wastewater · 2006
The effects of flow patterns and extinction coefficient on the photodegradation of organic compounds with TiO_2 film immobilized on the inner surface of glazed ceramic tube were investigated.Results indicate that overflow is appropriate for photodegradation of phenol,which can be easily directly degraded by UV lights.The constant of reaction rate is about 2 times of the falling film method.However,methylene blue(MB) can be photodegraded faster with falling film because MB can not be directly degraded easily by UV lights.The constant of reaction rate is about 2-3 times of that with overflow.In addition,extinction coefficient is an important influencing factor on the photodegradation.The rate constant will increase with the decrease of extinction coefficient,and an optimal tube radius and the maximum value of constant of reaction rate can be found while extinction coefficient is fixed.