Remarkablyenhancedpiezo-photocatalyticperformanceinBaTiO3/CuOheterostructuresfororganicpollutantdegradation

Introducing polarization field of piezoelectric materials is an effective strategy to improve photocatalytic performance.In this study,a new type of BaTiO3/CuO heterostructure catalyst was designed and synthesized to achieve high piezo-photocatalytic activity through the synergy of heterojunction and piezoelectric effect.The Ba TiO3/CuO heterostructure shows a significantly enhanced piezo-photocatalytic degradation efficiency of organic pollutants compared with the individual Ba TiO3 nanowires （NWs） and CuO nanoparticles （NPs）.Under the co-excitation of ultrasonic vibration and ultraviolet radiation,the optimal degradation reaction rate constant k of polarized BaTiO3/CuO heterostructure on methyl orange （MO） dye can reach 0.05 min-1,which is6.1 times of photocatalytic rate and 7 times of piezocatalytic rate.The BaTiO3/CuO heterostructure with remarkable piezo-photocatalytic behavior provides a promising strategy for the development of high-efficiency catalysts for wastewater purification,and it also helps understand the coupling mechanism between piezoelectric effect and photocatalysis.