Temperature Effect on the Photoeatalytic Degradation of Methyl Orange under UV-vis Light Irradiation

PTA sol was prepared using titanium tetrachloride (TiCl4), hydrogen peroxide (H2O2) and ammonia (NH3 center dot H2O), and then stable anatase-TiO2 hydrosol was synthesized by refluxing the PTA sol at 100 degrees C. It was found that TiO2 hydrosol can efficiently photo-degrade methyl orange (MO) under UV-vis light irradiation. Photocatalytic reactions at the temperature of 38 to 100 degrees C all followed pseudo-first-order rate law, and the temperature had a great effect on the reaction rate. The rate constants increased by about 6 times from 3.52 X 10(-4) to 2.17 X 10(-3) min(-1) when the temperature was adjusted from 38 to 100 degrees C. Consequently, this photocatalytic course can be accelerated by using the infrared light of solar energy to increase the temperature of the photo-catalytic reaction, it should be a potential way to make full use of solar light in photocatalysis in practice.