Method for preparing TiO2 composite film on surface of glass substrate

The invention relates to a method for preparing a TiO2 composite film on the surface of a glass substrate. The method comprises the following steps: putting the glass substrate in a Pirahan solution with the volume ratio of H2SO4 and H2O2 of 70 to 30 to be processed for 1 hour at the temperature of 90 DEG C; ultrasonic cleaning with deionized water, and putting in a dustproof oven for drying; immersing the glass substrate in a benzene solution with the mercapto silane concentration of 0.1-2.0mmol / L for standing for 6-8 hours, taking out, washing and then drying with nitrogen; putting in nitric acid with the mass concentration of 30-60%, reacting for 2 hours at the temperature of 50-80 DEG C, taking out and washing with the deionized water to obtain the glass substrate coated with a sulfonic silane film on the surface; immersing the glass substrate in a prepared TiO2 suspension, standing for 4-20 hours at the temperature of 20-80 DEG C, taking out, washing with the deionized water and drying with nitrogen to