Efficient degradation of MB dye by 1D FeWO4 nanomaterials through the synergistic effect of piezo-Fenton catalysis

Ferrous tungstate (FeWO 4 ) nanoparticles, nanorods, and nanofibers are prepared by hydrothermal method and their piezo-Fenton synergistic catalysis is investigated. The as-prepared one-dimensional FeWO 4 nanofibers show super high catalytic efficiency on the degradation of methylene blue (MB) and Rhodamine B (RhB). Furthermore, the catalytic reaction takes place under neutral conditions without the adjustment of pH. Under ultrasonic vibration with trace H 2 O 2 (0.02 vol%), FeWO 4 nanofibers can remove up to 99.5% of MB (20 mg/L) in 14 min. Recyclability experiments demonstrate that FeWO 4 nanofibers retain their catalytic activity after four recycles. The active species capturing experiments found that h + is the dominant active species in the degradation process. The high catalytic efficiency of FeWO 4 nanofibers ascribes to the synergistic effect of piezocatalytic and Fenton catalytic, which facilitates the transfer of charge carriers and accelerates the piezocatalytic process. The piezo-induced e − could favor the Fe 3+ /Fe 2+ cycle and accelerated the Fenton catalytic process. This work presents a new design strategy of advanced oxidation processes for remediation of water pollution, which is of great significance to environmental protection.