Photocatalysis is a process of converting light energy into chemical energy. Under the excitation of photons, electrons transition from the valence band to the conduction band and generate holes, thereby generating active free radicals-hydroxyl radicals to promote the oxidation of the substrate . At present, photocatalytic technology has been widely used in the fields of photolysis of water to produce hydrogen, alcohol oxidation, and oxidative degradation of organic waste . Common photocatalysts include ZnO , SnO , CdS , TiO2 , etc. Among them, TiO2 is favored because of its low price, stable properties, and non-toxicity. The bandgap energy of TiO2 is 3.2 eV, which inhibits its absorption of visible light. In addition, the electrons, and holes of TiO2 recombine quickly, which also leads to a lower quantum yield .