It is a promising technology to make full use of solar and mechanical energy for degrading organic pollutants. A synergetic piezo-photocatalytic system is constructed successfully by adopting semiconductor materials with piezoelectric effect, which realizes the ideal combination of photocatalytic heterojunction and piezoelectric catalysis. Herein, Bi₂MoO₆/BiOBr composite with coupled effect of photocatalysis and piezocatalysis are prepared by one-step hydrothermal reaction. Inspiringly, they present a gratifying degradation performance under visible light irradiation and stable ultrasonic vibration, which is much higher than the isolated photocatalysis and piezocatalysis. Especially, 5 wt% Bi₂MoO₆/BiOBr presents optimum methyl violet (MV, 20 mg/L) decomposition activity (99.6%, 60 min). It can be attributed that the bulit-in piezoelectric potential provided by vibrating p-type BiOBr nanosheets reduces the recombination efficiency of photogenerated carriers at the p-n heterojunction interface effectively.

充分利用太阳能和机械能降解有机污染物是一项很有前途的技术。甲小号ynergetic压电光催化系统通过采用半导体材料与压电效应，实现光催化异质结和压电催化的理想组合构建成功。本文通过一步水热反应制备了具有光催化和压电催化作用的Bi ₂ MoO ₆ / BiOBr复合材料。令人鼓舞的是，它们在可见光辐射和稳定的超声振动下表现出令人满意的降解性能，远高于孤立的光催化和压电催化。尤其是5 wt％Bi ₂ MoO ₆/ BiOBr具有最佳的甲基紫（MV，20 mg / L）分解活性（99.6％，60分钟）。可以归因于，通过振动p型BiOBr纳米片而产生的内激压电势能有效地降低了pn异质结界面处光生载流子的复合效率。