Nanoscale piezoelectrics have recently found applications in radios, switches, tweezers, sensors, actuators, field effect transistors and piezoelectric-gated diodes. Piezoelectrics may also be used to adsorb and efficiently degrade pollutants, yet knowledge is actually scarce. Two-dimensional transition metal dichalcogenides were recently found to be piezoelectric. Here, MoSe₂ nanoflowers were synthesized by the hydrothermal method then used to adsorb the malachite green dye, an antifungal and antibacterial agent for aquaculture. Results show very high dye adsorption, of 85% within 5 s under sonication, with a theoretical maximum adsorption capacity of 208.3 mg g⁻¹. This is explained by spontaneous physisorption via π–π stacking interactions between aromatic malachite green and electron-rich MoSe₂ nanoflowers. For the first time, this work clarifies that the piezoelectric effect of the few-layered MoSe₂ nanoflowers triggered by the ultrasonic vibration is a driven force for outstanding adsorption.

纳米级压电最近在无线电，开关，镊子，传感器，致动器，场效应晶体管和压电门控二极管中得到了应用。压电也可用于吸附并有效降解污染物，但实际上却很少。最近发现二维过渡金属二卤化物是压电的。在这里，通过水热法合成了MoSe ₂纳米花，然后将其用于吸附孔雀石绿染料，孔雀绿染料是用于水产养殖的抗真菌和抗菌剂。结果显示非常高的染料吸附，在超声处理下5 s内达到85％，理论最大吸附容量为208.3 mg g ^-1。这可以通过π – π的自发物理吸附来解释。芳香孔雀石绿和富电子的MoSe ₂纳米花之间的堆积相互作用。这项工作首次证明了超声振动触发的几层MoSe ₂纳米花的压电效应是出色吸附的驱动力。