Effect of external conditions on photocatalytic properties of nano - TiO2.

In order to find the optimal photocatalytic conditions for nano - TiO₂, the Fe³⁺ - doped nano - TiO₂ powder was prepared by sol - gel method using butyl titanate as raw material. Its composition was determined by XRD. Its photocatalytic properties were examined by UV - Vis, and the effect of external conditions including light intensity, pH value and surrounding temperature was disscused. Results indicate that in a certain range, the photocatalytic activity is enhanced with the increased light intensity, and the highest photocatalytic activity is achieved when pH = 4, while the ambient temperature has little effect on photocatalytic reaction. [ABSTRACT FROM AUTHOR]