Enhanced Photocatalytic Degradation of Microcystin-LR via Dynamic ROS Regulation at the Catalytic Interface

Reactive oxygen species (ROS) play an important role in the photocatalytic degradation of microcystin-LR (MC-LR). However, the regulation of ROS at the catalytic interface for selective oxidation of toxic sites in MC-LR is still poorly understood. In this study, a novel dynamic regulation strategy of ROS at the catalytic interface was proposed to enhance the photocatalytic degradation of MC-LR. The proposed dynamic regulation strategy was based on the modulation of the ROS concentration via the addition of different amounts of H2O2 and the use of a sacrificial electron acceptor, such as MnO2. This strategy effectively enhanced the photocatalytic degradation of MC-LR. Moreover, a mechanism study was also conducted to further explore the effect of the dynamic regulation of ROS on the photocatalytic degradation of MC-LR. The results showed that the dynamic regulation of ROS at the catalytic interface led to the selective oxidation of the toxic sites in MC-LR, which in turn facilitated the cleavage of MC-LR molecules. This study provides a new approach for the selective oxidation of toxic sites in MC-LR and may facilitate the design of efficient photocatalytic systems for the degradation of MC-LR.