Synthesis of magnetic core–shell Fe3O4@MoS2-Ag composite for the efficient photocatalytic reduction of Cr(VI)

[Display omitted] •Synthesized Ag decorated magnetic core–shell Fe3O4@MoS2 composite via hydrothermal.•Better photogenerated electron transfer effect and photocatalytic performance driven by Ag0 doping.•Magnetic core–shell structure brought about excellent solid–liquid separability.•Great enhancement of Cr (VI) reduction efficiency under the sunlight. An Ag decorated magnetic core–shell Fe3O4@MoS2 composite was synthesized in this work to improve the photocatalytic performance and solid–liquid separation of MoS2 based materials. The composite was evaluated by UV–vis IS-NIR spectrometer, photoluminescence (PL) spectra, XRD, XPS, EDS, EIS and was devoted to reduce the toxicity of wastewater which contains hexavalent chromium(Cr(VI)) for its potential economic value. The results have shown that the core–shell structure effectively inhibits the stack of nanosheets, increases the specific surface area of the material, and exposes more active sites. Besides, loading Ag can effectively promote the migration of photogenerated electrons and improve the photocatalytic performance. On this basis, the better separability and retrievability which got form the magnetic core–shell Fe3O4 may immensely promote the photodegradation technique of hexavalent chromium (Cr (VI)) and provided a new strategy for photocatalytic degradation of industrial industrial wastewater that containing hexavalent chromium (Cr (VI)).