Abstract

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.

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