摘要
Abstract 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/MoS 2 /Fe 2 O 3 ternary composites (MG/Fe 2 O 3 ) were prepared via a two-step simple hydrothermal process using H 2 MoO 4 , CH 4 N 2 S, graphene oxide, and Fe(NO 3 ) 3 ·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 MoS 2 /graphene hybrids were successfully composited with Fe 2 O 3 . 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/Fe 2 O 3 composites (3.01 × 10 −3 min −1 ) was observed, which was 1.5 times higher than that of pure Fe 2 O 3 (1.97 × 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 MoS 2 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 Fe 2 O 3 . This research may provide new concepts for the design of high-efficiency photocatalysts and broaden the potential of application of Fe 2 O 3 in photocatalytic fields. Graphical Abstract MoS 2 /graphene/Fe 2 O 3 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.
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