Piezoelectric catalytic performance of multi-flaw MoS2 nanosheet in degradation of norfloxacin
Multi-flaw MoS2 nanosheets were synthesized by a hydrothermal method through controlling the molar ratio of Mo and S. The morphologies and structures of the samples were characterized by SEM and XRD,and the piezoelectric catalytic performance of the sample was evaluated using norfloxacin as the target pollutant. The results showed that compared with flaw-free MoS2 ,multi-flaw MoS2 nanosheets exhibited excellent piezocatalytic ability. The degradation efficiency of Flaw MoS2 (1:5) nanosheets for norfloxacin can reach 99. 69％ in 11 min under ultrasonic irradiation, and the degradation rate constant is 6. 78 min-1 . The superior piezocatalytic performance of multi-flaw MoS2 nanosheets was mainly attributed to the highly efficient separation of electron-hole pairs caused by the strain-induced piezoelectric field. Active species trapping experiments demonstrated that the hydroxyl radicals ( ·OH) were the major reactive oxygen species for degradation of norfloxacin. In addition,the ultrafast degradation efficiency of multi-flaw MoS2 nanosheets could be used for practical environmental remediation applications.
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