Visible-light-response organic-inorganic hybrid CdS/MIL-101-NH2 S-scheme heterostructures for high-efficient photo-Fenton application

Developing artificial-photosynthesized heterostructures for solar energy conversion has inspired extensive interest, but the organic-inorganic hybrid Fe-based MOF photocatalyst is still in shortage. Here we report a visible-light response CdS/MIL-101-NH2 hybrid S-scheme heterostructure to exhibit efficient photocatalytic and photo-Fenton functionalities under the simulated solar-driven irradiation. In our work, the 0D CdS nanoparticles have in-situ anchored on the 3D NM101 octahedron to form well interface connection by a mild and simple co-precipitation method, which effectively promoted to shorten the carrier transfer distance as well as to promote charge separation. The whole photo-physics process has been revealed by systemically characterizations and the artificial-photosynthesized S-scheme heterostructure has been confirmed by the results of electrochemical measurements and density functional theory (DFT) calculations. By comparison, the as-prepared CdS/MIL-101-NH2 photocatalysts have more potential applications in Fenton-like advanced oxidation techniques considering their stability and element with variable valency, furthermore, the corresponding mechanism has been discussed. Our work extends the territory of organic-inorganic hybrid heterostructures and hopes to provide a new viewpoint for fabricating efficient artificial-photosynthesized photocatalysts.