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2D nanomaterials, which have a surface area that is dominatedby one specifi c crystallographic plane, have receivedincreasing interest in decades. [ 25,26 ] Since a 2D material isentirely made up of its surface, the interface between the surfaceand the substrate and the presence of adatoms can dramaticallyalter the material's properties. [ 27 ] The unique surfacestructure can guarantee the intimate and large contact interfaceswith graphene, which favors the transfer of photogeneratedelectrons from the semiconductor to graphene, leadingto the higher effi ciency in the separation of photogeneratedcharge carriers and a higher photoactivity. [ 28 ] Here, 2D α-Fe 2 O 3hexagonal nanoplates/graphene composites with good distributionare synthesized for the fi rst time using a simple one-steptemplate-free hydrothermal method, which achieves the effectivereduction of the graphene oxide (GO) to graphene and theintimate and large contact interfaces of the α-Fe 2 O 3 nanoplateswith graphene. The α-Fe 2 O 3 /graphene composites with differentweight ratios of GO to α-Fe 2 O 3 (0.1%:1, 1.0%:1, 2.0%:1,5.0%:1, 8.0%:1) are synthesized and are defi ned as 0.1GRF,1.0GRF, 2.0GRF, 5.0GRF, and 8.0GRF, respectively, and thepure α-Fe 2 O 3 nanoplates were used for comparison. The significantincrease in photocatalytic activity is confi rmed by the degradationof Rhodamine B (RhB) in the presence of the α-Fe 2 O 3 /graphene composites, and the rate constant k a of 5.0GRFreaches 0.19489, exceeding that of pure α-Fe 2 O 3 by a factor offour. It is also worth noting that 98% of RhB was degraded for5.0GRF in 20 min, which is one of the most effective photocatalyststo our knowlege. Furthermore, this work highlights themechanism for enhancing photocatalytic performance after theintroduction of GO, which is benefi cal for further improvingphotoactivit
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