Combination of two-dimensional (2D) materials and semiconductors is considered to be an effective way for fabricating photocatalysts for solving the environmental pollution and energy crisis. In this work, novel 2D/2D heterojunction of R-scheme Ti 3 C 2 MXene/MoS 2 nanosheets is successfully synthesized by hydrothermal reaction. The photocatalytic activity of the Ti 3 C 2 MXene/MoS 2 composites is evaluated by photocatalytic degradation and hydrogen evolution reaction. Especially, 0.5 wt% Ti 3 C 2 MXene/MoS 2 sample exhibits optimum methyl orange (MO) degradation and H 2 evolution rate of 97.4% and H 2 evolution rate of 380.2 μmol h −1 g −1 , respectively, which is attributed to the enhanced optical absorption ability and increased specific surface area. Additionally, Ti 3 C 2 MXene coupled with MoS 2 nanosheets is favorable for improving the photocurrent response and reducing the electrochemical impedance, leading to the enhanced electron transfer of excited semiconductor and inhibition of charge recombination. This work demonstrates that Ti 3 C 2 MXene could be a promising carrier to construct 2D/2D heterojunction in photocatalytic degradation and hydrogen evolution reaction.
Bi 2 Fe 4 O 9 (BFO) is one of the most important photocatalyst materials and its composition with graphene may leave an optimizing effect on the photocatalytic performance. In this paper, reduced graphene oxide (RGO) with various contents is selected to be composited with BFO successfully via one-step hydrothermal method. A series of 1.25, 2.50, 3.75,5, 6.25, and 7.50 wt.%) were prepared and the effects of RGO content on crystalline, light absorption, impedance, and photocatalytic degradation rate of methyl violet (MV) solution are characterized. The entire film samples exhibit enhanced photocatalytic efficiency.Especially, with 5 wt.% RGO content added, the film sample shows the best photocatalytic degradation efficiency with a MV solution degradation rate of 95%.This implies that the composition of RGO allows BFO-based thin film as an efficient photocatalyst candidate, and as well, the BFO/RGO composite possesses the potential for better use in the related photocatalyst applications. K E Y W O R D S composites, optical properties, thin films
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