▎ 摘　　要

There has been considerable progress in the field of semiconductor photocatalysis; nevertheless, developing low-cost and high-activity photocatalysts are still a challenge at the present. Here, a series of graphene/MoS2/Fe2O3 ternary composites (MG/Fe2O3) were prepared via a two-step simple hydrothermal process using H2MoO4, CH4N2S, graphene oxide, and Fe(NO3)(3)center dot 9H(2)O as the starting materials, respectively. Various techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence spectra, and UV-Vis diffuse reflectance spectroscopy were adopted to characterize the as-prepared samples. The results suggested that MoS2/graphene hybrids were successfully composited with Fe2O3. A redshift of absorption edge in the light region and more absorption in the visible light region were confirmed for the prepared ternary composites. The highest photocatalytic activity of MG/Fe2O3 composites (3.01 x 10(-3) min(-1)) was observed, which was 1.5 times higher than that of pure Fe2O3 (1.97 x 10(-3) min(-1)). The effect of ultrasound on photocatalytic reactions was investigated, and its photodegradation rate was improved 2.2 times than the photoreactor system without sonication. The results indicated that the positive synergetic effect of the MoS2 and graphene components in this hybrid cocatalyst, which extended the light response and acted as a charges transfer medium, respectively, is the key to improve photocatalytic performance of Fe2O3. This research may provide new concepts for the design of high-efficiency photocatalysts and broaden the potential of application of Fe2O3 in photocatalytic fields. MoS2/graphene/Fe2O3 nanocomposites were successfully fabricated via a simple two-step hydrothermal process and a considerably enhanced activity of visible light-induced photodecomposition of MB was demonstrated. [GRAPHICS]