In situ growth of Bi/Ag double quantum dots on hollow Bi2MoO6 microspheres: Enhancement of the surface plasmon resonance effect on PMS activation

In this work, the effect of Bi/Ag double quantum dots on plasmon resonance and PMS activation was investigated. Bi/Ag double quantum dots were generated in situ on hollow Bi2MoO6 microspheres by stepwise irradiation using a high-energy β electron beam. The formation of Bi/Ag DQDs greatly optimized the drawbacks of Bi2MoO6 in terms of light absorption. Synergistic introduction of DQDs greatly reduced the band gap from 2.72 eV to 2.12 eV. The Bi−Ag@Bi2MoO6 − 400/PMS system degraded ciprofloxacin with kinetic constants 10 and 12 times higher than those of the Bi@Bi2MoO6/PMS and Bi2MoO6/PMS systems. The formation of an electron transfer path from Ag QDs to Bi QDs enhanced the SPR effect of Bi QDs.·O2− and 1O2 played a major role in the CIP degradation process. This study will provide a new strategy for enhancing the Bi plasmon resonance effect and provide a technical method to the efficient degradation of antibiotics in water.