Modified Titanium dioxide-based photocatalysts for water treatment: Mini review

Titanium dioxide (TiO2), recognized for its affordability, low cost, high chemical stability, and eco-friendliness, has garnered extensive research attention in recent years. But because of the TiO2 band gap (>3.2eV) seriously limit the use of visible light, and fast electron-hole composite in TiO2 often lead to poor photocatalytic activity and low quantum yield. Therefore, TiO2 needs to be modified. Modification can change the broadband gap of TiO2, enhance light absorption, thus affect the important means of photocatalytic efficiency. In this review, we introduce the crystal form and photocatalytic mechanism of TiO2, and review some modification strategies of TiO2, including doping modification, construction of heterojunctions, crystal plane engineering and defect engineering. Furthermore, we review the application of modified TiO2-based photocatalytic materials in water treatment, including the removal of dye contaminants, antibiotics, advanced oxidative sterilization, and finally explore the challenges and prospects of modified TiO2-based photocatalysts.