Abstract
Niobium oxyfluoride (Nb3O7F) nanomaterials have been the focus of photocatalysis due to their excellent optoelectronic properties. However, the practical application of Nb3O7F suffers from the low photocatalytic efficiency and quantum efficiency due to their wide bandgap. In this paper, Nb2O5-modified Nb3O7F hybrid photocatalysts are crafted in situ through directly thermal decomposition method for the first time. The crystallographic phase sensitively correlates with heat-treated temperature, posing great challenges to synthesize active products with tuned phases, composition and properties. The photocatalytic activities have been investigated by degrading methylene blue (MB) under visible light irradiation. Compared with pure Nb3O7F, Nb3O7F/Nb2O5 nanocomposites exhibit enhanced photocatalytic performance due to perfect crystallization and synergistic effect. Nb3O7F-500 catalysts with 0.391 min−1 rate constant can achieve final 96.7% degradation rate in 60 min, while pure Nb3O7F catalysts with 0.376 min−1 rate constant only get 49.3% in the same time. The cycle experiments show Nb3O7F/Nb2O5 photocatalysts have good stability. Such hybrid nanocomposites are very attractive for photocatalytic applications.
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