CuS[sbnd]ZnS decorated Fe3O4 nanoparticles as magnetically separable composite photocatalysts with excellent hydrogen production activity

Abstract

CuS nanoparticles were decorated on Fe3O4@ZnS particles for the synthesis of magnetically separable photocatalysts with magnetic Fe3O4 core, together with heterojunction interfaces between ZnS and CuS. The electron-hole spatial separation ability and photocatalytic activity can be improved by optimizing the amount of CuS grown on ZnS. The highest photocatalytic H2 generation activity of the Fe3O4@ZnSCuS photocatalyst reached 18000 μmol/g−1 h−1. The crystalline property, morphology, optical property, photocurrent response, magnetic performance, photocatalytic performance, and separation property of the composite photocatalysts were investigated. The photocatalysts can be separated and recycled by a magnet. A mechanism of photocatalytic H2 generation by the Fe3O4@ZnSCuS photocatalysts was proposed. The recombination of photoexcited electron and hole was suppressed by such kind of electron transfer, leading to the enhanced activity of the Fe3O4@ZnSCuS photocatalysts.