Abstract
In this study, surfactant-assisted CdIn2S4 nanoparticles were successfully combined with Bi2MoO6 microspheres to construct internal electric field-mediated S-scheme CdIn2S4/Bi2MoO6 heterojunction photocatalysts. Under simulated sunlight, the degradation efficiency of the antibiotic levofloxacin (LVX) by 25 %-CdIn2S4/Bi2MoO6 reached 93.7 % within 90 min. The cyclic experiments show that the composite has good stability and reusability. In addition, we studied the effect of environmental factors on the degradation efficiency of LVX, and proposed the possible degradation pathways of LVX. The experiment on free radical scavenging and the Electron Spin Resonance (ESR) experiment indicated that the collaborative action of ·OH and ·O2- effectively enhanced the degradation of LVX. The existence of the S-scheme charge transfer mechanism is further confirmed through in situ X-ray photoelectron spectroscopy (ISI-XPS) and density functional theory (DFT) calculations. This work provides crucial references for the design and preparation of S-scheme heterojunction photocatalysts, holding promising prospects in the field of antibiotic pollutant removal.
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