A novel 1T-2H MoS2/NaBi(MoO4)2 alternating-phase piezoelectric composites for high-efficient ultrasound-drived piezoelectric catalytic removal of Sildenafil

Abstract

Ecological risks and environmental contamination from misuse of novel contaminant PDE-5i-like compounds still persisted during the COVID-19 pandemic. In this study, MoS2/NaBi(MoO4)2 piezoelectric composites were utilized to piezocatalytic degradation of the PDE-5i-like novel contaminant Sildenafil by ultrasound-driven piezoelectric process. Among them, 1T-2H MoS2/NaBi(MoO4)2 achieving a piezoelectric catalytic degradation of sildenafil of 99.8% within 60 min by ultrasound-drived, ecotoxicity of Sildenafil also can be effectively reduced. Experimental and DFT calculations proved that the differential enhanced piezoelectric properties were attributed to the loading of different phases (1T, 1T-2H, 2H) of MoS2 on NaBi(MoO4)2. 1T-2H MoS2/NaBi(MoO4)2 material possessed the best piezoelectricity with a piezoelectric response amplitude of 233.3 pm/V, 8.1 times higher than that of NaBi(MoO4)2 (28.89 pm/V). Characterization and calculation reveals alternating changes in the phase state of 1T-2H MoS2 provide an alternating polarization piezoelectric field to optimize the piezoelectric properties of 1T-2H MoS2/NaBi(MoO4)2. This work provides new insights into the application of piezoelectric materials for environmental clean-up.