Self-Generation of Reactive Oxygen Species on Crystalline AgBiO for the Oxidative Remediation of Organic Pollutants.

In this study, we synthesized a novel perovskite nanomaterial consisting of AgBiO nanoparticles (NPs) via an ion-exchange method for remediation of polluted environments. The AgBiO NPs could self-produce significant amounts of reactive oxygen species (ROS) without light illumination or any other additional oxidant due to the controllable release of lattice oxygen from the crystalline AgBiO, resulting in the formation of ROS somehow. The self-produced O, O, and OH were confirmed by electron spin resonance spectroscopy using a spin trap technique. We found that the AgBiO NPs could be reused for the mineraliztion of most recalcitrant organic compounds alone, including Rhodamine B (RhB), phenol, 4-chlorophenol, 2,4-dichlorophenol, and bisphenol A. After the repeated eight cycles of continious treatment of RhB, AgBiO NPs still achieved 79% of degradation after 30 min of treatment. Characterization results revealved that the lattice oxygen inside AgBiO was activated to form active oxygen (O*), which resulted in consecutive formation of ROS. This study provides new insight on the lattice oxygen activation mechanism of silver bismuthate and its application to the remediation of polluted waters.