Heterostructured photocatalysts play a significant role in the removal of contaminants by decreasing the recombination of the photo-induced charges. Herein, we presented novel TiO 2 /C/BiVO 4 ternary hybrids employing a 2D layered Ti 3 C 2 MXene precursor, overcoming the lattice mismatching of TiO 2 /BiVO 4 binary heterostructures simultaneously. Raman and XPS analyses proved the strong coupling effects of TiO 2 , carbon and BiVO 4 components, and the heterostructures were identified from high-resolution transmission electron microscopy results. Moreover, the ternary TiO 2 /C/BiVO 4 composites exhibit excellent photocatalytic performance of Rhodamine B degradation, which is about four times higher than pure BiVO 4 and twice that of binary TiO 2 /BiVO 4 heterostructures, reaching a reaction constant of 13.7 × 10 −3 min −1 under visible-light irradiation ( λ > 420 nm). In addition, for the possible mechanism for dye elimination it was proposed that RhB molecule be directly oxidized by photo-induced holes (h + ) on the BiVO 4 components and superoxide radical ( O 2 · − ) generated from conduction band electrons of the heterostructures. This work will provide possibilities for developing visible-light responsive nanomaterials for efficient solar utilization.
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Shi et al. (2018) studied this question.
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