摘要
Utilizing molybdenum disulfide (MoS 2 ) based catalysts for piezoelectric-catalyzed degradation of organic pollutants in water has been widely investigated as a promising route. Although favorable results have been obtained, H 2 O 2 produced during the catalytic process was neglected and not effectively utilized. Therefore, a hypothesis was proposed to introduce exogenous metal elements for the post-modification of MoS 2 , and the Fenton-like reaction carried out between the exogenous metal and the in situ generated H 2 O 2 , which successfully constructed a Piezocatalytic Fenton (PF) system. In this work, a novel MoS 2 -based piezoelectric material, M−MoS 2 (M = Fe, Zn, Cu, Ni, Co), has been developed for PF reactions. Fe-MoS 2 had the most excellent piezocatalytic performance with norfloxacin (NOR) as the target pollutant, with a removal rate of 93.2 % within 5 min. The performance enhancement could be attributed to the change in morphology and structure. Fe element uniformly distributed on minor size 1T/3R phases MoS 2 , which had high carrier concentration and conductivity with in-plane and out-of-plane piezoelectricity. PFM tested that Fe-MoS 2 had a 10 times larger piezoelectric coefficient than MoS 2 . Such outstanding performance was achieved by innergenerated-hydrogen peroxide (H 2 O 2 ) and simultaneous effective activation and generating reactive oxygen species (ROSs) from oxygen and water via piezoelectric catalysis. Fe ions rapidly underwent a Fenton-like reaction with H 2 O 2 , Mo, and Fe ions valence states keep transforming and efficiently utilized H 2 O 2 . Non-radicals and radicals synergistically drove the degradation process, with 1 O 2 as the main active species. The MoS 2 modification strategy proposed in this work effectively improved the conversion of H 2 O 2 for efficient energy utilization and provided a theoretical basis for green and energy-saving piezocatalytic technology.
危险品化学品经营许可证（带存储）