Perovskite bismuth ferrite(BiFeO3)with narrower bandgap was synthesized by a hydrothermal method in response to the problems of high recombination rate of photoelectrons and holes with low absorption efficiency of visible spectrum during photocatalytic process.The results show that the degradation rate of indigo carmine reaches 97.6％in 15 min of the best-performed BiFeO3 sample synthesized at a NaOH concentration of 8 mol/L under the synergic effect of ultrasound and illumination.The fitted first-order reaction rate constant is 0.203 6 min-1,which is attributed to its lower electron-leap energy threshold by narrower bandgap.The mechanism of piezo-photocatalysis is clarified by free radical trapping experiments and the synergistic effect that the piezoelectric field of BiFeO3 promotes the photocatalytic process is verified.
维普
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