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Construction of rGO/Bi2MoO6 2D/2D nanocomposites for enhancement visible light-driven photocatalytic reduction of Cr (VI)

2D/2D stacking heterostructures are highly desirable in constructing efficient photocatalysts. In this paper, reduced graphene oxide and Bi2MoO6 2D/2D nanocomposites were achieved by a two-step hydrothermal method. The combined characterizations including x-ray diffraction, Raman, scanning electron microscopy and transmission electron microscopy indicated the successful formation of rGO/Bi2MoO6 plate-on-plate heterojunction structure, where Bi2MoO6 nanosheets with average size about 100–200 nm dispersed on the surface of large-size graphene plates. According to the test of photocatalytic activity, rGO/Bi2MoO6 compositions exhibited an excellent photocatalytic capacity to Cr (VI) reduction. The composite containing 2.5% rGO shows the optimal photocatalytic activity, and its reduction rate to Cr (VI) is 94% in 30 min, twice higher than that of pure Bi2MoO6. The visible light absorption increasing and the improving of charge-carrier transference result in good photocatalytic performance of 2D/2D rGO-Bi2MoO6.