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Novel sphere-like MoS2/BiOBr composites were prepared by a facile ethylene glycol (EG)-assisted solvothermal process in the presence of the ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C16mim]Br). A nanostructured heterojunction, with few-layer MoS2 deposited on the surface of BiOBr microspheres, was constructed. During the synthetic process, the ionic liquid acted as a reactant, a template and a dispersing agent at the same time, leading to the formation of few-layer MoS2 dispersed on the surface of BiOBr microspheres. The MoS2/BiOBr composites exhibited much higher visible light photocatalytic activity towards rhodamine B (RhB) photodegradation than pure BiOBr. 3 wt% MoS2/BiOBr possessed the optimal photocatalytic activity, which was approximately 2.5 times as high as that of pure BiOBr. Through multiple characterization techniques, the relationship between the specific structure and the admirable photocatalytic activity of the MoS2/BiOBr microspheres was investigated. The critical role of the few-layer MoS2 in the MoS2/BiOBr microspheres was explored. A photocatalytic mechanism for the MoS2/BiOBr composites was also proposed.

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The BiOBr hollow microspheres attached with few-layered molybdenum disulfide (MoS 2 ) were prepared by ethylene glycol (EG) assisted microwave process in the presence of 1-hexadecyl-3-methylimidazolium bromine ([C 16 mim]Br). The as-prepared samples are characterized by X-ray diffraction (XRD), X-ray 10 photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and UV-vis diffuse reflectance spectroscopy (DRS). During the reaction process, the ionic liquid [C 16 mim]Br acts as not only solvent and Br source but also microwave-absorbing agent and template for fabrication of MoS 2 /BiOBr hollow microspheres. In addition, the photocatalytic activity of the MoS 2 /BiOBr is evaluated by degradation 15 ciprofloxacin (CIP) and rhodamine B (RhB) under visible-light irradiation. The result exhibited that 0.2 wt% MoS 2 /BiOBr microspheres exhibit higher photocatalytic activity than BiOBr. A possible photocatalytic mechanism based on the relative band positions of 0.2 wt% MoS 2 /BiOBr has been proposed.The BiOBr hollow microspheres attached with single-layered molybdenum disulfide (MoS 2 ) were prepared by ethylene glycol (EG) assisted microwave process in the presence of 1-hexadecyl-3-methylimidazolium bromine ([C 16 mim]Br). During the reaction process, the ionic liquid [C 16 mim]Br acts as not only solvent and Br source but also microwave-absorbing agent and template for fabrication of MoS 2 /BiOBr hollow microspheres. In addition, the photocatalytic activity of the MoS 2 /BiOBr is evaluated by degradation ciprofloxacin (CIP) and rhodamine B (RhB) under visible-light irradiation. The result exhibited that 0.2 wt% MoS 2 /BiOBr microspheres exhibit higher photocatalytic activity than BiOBr. A possible photocatalytic mechanism based on the relative band positions of 0.2 wt% MoS 2 /BiOBr has been proposed.

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