Non-noble CeO2/CdS/NiS heterojunction for photoredox-catalyzed plastic waste selective synthesis and hydrogen production from natural seawater

White plastic waste in the ocean not only destroys the Marine ecology, but also poses a potential threat to human health. In this study, we proposed a simple synthesis method by introducing suitable electron-bridge to design and synthesize CeO 2 -based II-type heterostructure catalysts with dual functions for efficient hydrogen production from seawater and photocatalytic conversion of plastics. The CeO 2 /CdS/NiS showed remarkable photocatalytic performance in the presence of plastic as the sacrificant. The hydrogen production rate of CeO 2 /CdS/NiS at the fifth hour was 32.40 mmol/g/h, which was 29 times that of bare CdS and 463 times that of bare CeO 2 . At the same time, the use of natural seawater to replace deionized water in this study was economically beneficial. Furthermore, we verified the feasibility of the selective oxidation of plastics into pyruvate, acetate and formate using CeO 2 /CdS/NiS photocatalyst and put forward a rational reaction mechanism. Overall, the study provids new possibilities for solving the problem of Marine plastic pollution and promoting the development of clean energy.