In order to reduce the secondary recombination of photogenic charge carriers caused by the structural defects at the interface of traditional heterostructure photocatlysts, and the charge shielding effect of static condition on the built-in electric field in ferroelectric/piezoelectric photocatalyst, two typical piezoelectric photocatalysts, BaTiO₃ and KNbO₃, were successfully compounded into a series of BaTiO₃/KNbO₃ heterostructure photocatalysts for the first time. BaTiO₃ nanoparticles with good crystallinity are uniformly distributed on the surface of KNbO₃ prism to form the BaTiO₃/KNbO₃ heterostructure. The piezo-response force microscopy (PFM) results and piezo-photocatalytic degradation experiments stimulated by ultrasonic vibration and light irradiation show that the separation efficiency of photogenic charge carriers and degradation performance are enhanced by the synergistic effect of piezocatalysis and photocatalysis. The piezo-photocatalytic degradation efficiency of BaTiO₃/KNbO₃ over direct lake blue 5B dye can reach up to 93.3%. The reaction rate constant of 0.3BaTiO₃/0.7KNbO₃ over the target dye is 4.44 and 8.57 times higher than that of BaTiO₃ and KNbO₃. This work will provide a promising paradigm to degrade organic pollutants by using synergetic effect of piezocatalysis and photocatalysis, which perhaps facilitates the practical applications of piezo-photocatalytic technology in the environmental field.

为了减少由传统异质结构光催化剂界面处的结构缺陷引起的光生电荷载流子的二次复合，以及静态条件对铁电/压电光催化剂（两种典型的压电光催化剂）中内置电场的电荷屏蔽效应， BaTiO ₃和KNbO ₃首次成功地掺入了一系列BaTiO ₃ / KNbO ₃异质结构光催化剂中。具有良好结晶性的BaTiO ₃纳米颗粒均匀地分布在KNbO ₃棱镜的表面上，形成BaTiO ₃ / KNbO ₃异质结构。压电响应力显微镜（PFM）的结果和超声振动和光辐射激发的压电光催化降解实验表明，压电催化和光催化的协同作用提高了光生载流子的分离效率和降解性能。BaTiO ₃ / KNbO ₃在直接湖蓝5B染料上的压电光催化降解效率可达到93.3％。在目标染料上的0.3BaTiO ₃ /0.7KNbO ₃的反应速率常数比BaTiO ₃和KNbO ₃的反应速率常数高4.44倍和8.57倍。这项工作将为利用压电催化和光催化的协同效应降解有机污染物提供一个有希望的范例，这可能会促进压电光催化技术在环境领域的实际应用。