Abstract
CoFe2O4@ZnS core–shell nanoparticles were used as hydrogen production photocatalysts, which can be recycled by magnetic force for repeated hydrogen generation. Magnetic CoFe2O4 nanoparticles were used as core materials. The ZnS shell layer is synthesized with zinc acetate and thiourea as precursors by a solvothermal process. The morphology, crystalline property, surface area, magnetic property, photocatalytic H2 production performance, and magnetic recycling capability of the photocatalysts were investigated. Effects of ZnS shell growth time (ZnS shell thickness) and calcination treatment on the photocatalytic activity were studied. Calcination helps to improve the photocatalytic activity. The H2 production rate of CoFe2O4@ZnS-0.5h photocatalyst calcinated at 500°C reached 1650μmol/gh. The photocatalysts can be effectively recycled by an external magnet. Recycled photocatalysts exhibit good hydrogen generation performance after being recycled for three times.
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