PiezocatalyticperformanceofFe2O3-Bi2MoO6catalystfordyedegradation

A Fe2O3-Bi2MoO6 heterojunction was synthesized via a hydrothermal method.Scanning electron microscopy,transmission electron microscopy,energy-dispersive X-ray,powder X-ray diffraction,Fourier transform infrared spectroscopy and ultra-violet-visible near-infrared spectrometry were performed to measure the structures,morphologies and optical properties of the as-prepared samples.The various factors that affected the piezocatalytic property of composite catalyst were studied.The highest rhodamine B degradation rate of 96.6% was attained on the 3% Fe2O3-Bi2MoO6 composite catalyst under 60 min of ultrasonic vibration.The good piezocatalytic activity was ascribed to the formation of a hierarchical flower-shaped microsphere structure and the heterostructure between Fe2O3 and Bi2MoO6,which effectively separated the ultrasound-induced electron-hole pairs and suppressed their recombination.Furthermore,a potential piezoelectric catalytic dye degradation mechanism of the Fe2O3-Bi2MoO6 catalyst was proposed based on the band potential and quenching effect of radical scavengers.The results demonstrated the potential of using Fe2O3-Bi2MoO6 nanocomposites in piezocatalytic applications.