Enhanced magnetic property and photocatalytic activity of UV-light responsive N-doped Fe2O3/FeVO4 heterojunction
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Abstract
Abstract Magnetic N-doped Fe 2 O 3 /FeVO 4 heterostructure photocatalysts with a rod-like structure had been successfully obtained by the hydrothermal method. The as-obtained products were characterized by XRD, SEM, TEM, XPS, DRS, PL and BET analysis. UV-light responsive photodegradation of Rhodamine B (RhB) was studied to evaluate the photocatalytic properties of the products. The results reveal that N-doped Fe 2 O 3 /FeVO 4 heterojunctions with triclinic FeVO 4 (P-1) and trigonal α-Fe 2 O 3 (R-3c:H) exhibit the higher photocatalytic activity than that of the pure FeVO 4 . The N-doped Fe 2 O 3 /FeVO 4 ( R N =0.75) heterojunction with the maximum content of α-Fe 2 O 3 (30.46%) shows the best photocatalytic activity under UV–light irradiation, which can efficiently catalyze the degradation of RhB up to 90% at 180 min. The obtained data are used to analyze the enhanced photocatalytic mechanism. The doped N 3− ions provide an impurity level to capture the electrons produced from the valence band of FeVO 4 and these electrons can subsequently be transferred to the surface adsorbed O 2 to produce O 2 − . Furthermore, the high M s value (20.78 emu/g) of the N-doped Fe 2 O 3 /FeVO 4 ( R N =0.75) heterojunction is strong enough to maintain their good performance of magnetic recovery after the photocatalytic reactions.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Iron oxide chemistry and applications · Copper-based nanomaterials and applications
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