Photocatalytic Degradation of Organic Pollutants and Microplastics Using Ag/TiO₂: Recent Advances in Mechanism, Synthesis and Properties

TiO₂ is one of the most common and well-researched photocatalysts. However, it possesses certain limitations that hinder its research progress and practical application in the degradation of organic pollutants, particularly in the realm of (micro)plastics degradation. The modification of TiO₂ is currently a research hotspot in the photocatalytic degradation of organics. Noble metal Ag, with its unique advantages of safety, environmental friendliness, antibacterial properties, and good electrical conductivity, is an excellent modifier for TiO₂. This study first delved into the enhancement mechanism of Ag on TiO₂ photocatalytic degradation and the mechanisms of Ag/TiO₂ for degrading common organics and microplastics. It also discussed the preparation methods of Ag/TiO₂ complexes, their advantages, disadvantages, and applications of each method. Furthermore, it presented a comparative analysis of the current research status of TiO₂ and Ag/TiO₂ photocatalytic degradation of organics, particularly on (micro)plastics. Finally, it highlighted the limitations and shortcomings of current studies and proposed potential future research directions. This research serves as a guide for the large-scale production of efficient Ag/TiO₂ photocatalysts and the promotion of research on Ag/TiO₂ photocatalytic degradation of microplastics.