Two-Step Solvothermal Method Assisted by Ultrasonic Exfoliation to Construct Nb3O7F/MoSe2 Hybrids with Enhanced Photocatalytic Activity

摘要

Niobium oxyfluoride (Nb3O7F) materials have in the past five years received wide attention, because of their excellent optoelectronic properties, perfect crystallinity and good thermal stability. However, Nb3O7F materials are also confronted with challenges of wide bandgap, weak spectrum response and low carrier transfer. Here, we for the first time developed a two-step solvothermal method to controllably load Nb3O7F on molybdenum diselenide (MoSe2) nanosheets. Construction of Nb3O7F/MoSe2 heterostructures was confirmed from X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Raman, X-ray photoelectron spectroscopy (XPS) and UV-vis spectrophotometer. Results indicated that introduction of MoSe2 into Nb3O7F led to slightly decrease of band gap from 3.14 to 3.02 eV. Photocatalytic experiments on Nb3O7F/MoSe2 hybrids manifested propitious performance (98%) towards removal of rhodamine B (RhB) in 90 min under visible-light irradiation, by benefiting from the synergistic effect of band realignment, improved spectral response and higher carrier separation. These results may open up a feasible method for improvement of efficient niobium-based photocatalysts.