Ag2S/TiO2 Z-scheme heterojunction under magnetic field: Enhanced photocatalytic degradation of tetracycline
Source abstract
Abstract
Multi-field assisted photocatalytic technology is an effective way to improve the photocatalytic performance of photocatalysts. Herein, we synthesized the Ag 2S/TiO 2 Z-scheme heterojunction photocatalyst and demonstrated the impacts of internal electric field (EF) and external magnetic field (MF) on the degradation of tetracycline (TC). Their structural, optical and electrochemical properties were characterized in detail. Ag 2S/TiO 2 demonstrated conspicuously enhanced photocatalytic activity towards the degradation of TC owing to the photosensitization of Ag 2S and effective separation of charge carriers by forming an internal EF at the interface of the composite. Further, a higher degradation of TC (degradation conversion: 95.7 % and TOC removal: 75.7 %) was achieved by imposing the 1400 Gauss of an external MF and 500 rpm. This is due to the high-rate charge carrier separation and migration caused by MF induced spin polarization and Lorentz force acting on charge carriers, accelerating TC degradation with lower active energy (MF: 33.18 KJ·mol −1 and NMF: 49.01 KJ·mol −1). Furthermore, Ag 2S/TiO 2 also demonstrated exceptional stability and reusability. The photocatalytic mechanism of Ag 2S/TiO 2 Z-scheme heterojunction under MF was discussed in detail based on the identification of the main reactive species (·OH and ·O 2 −) by radical trapping experiments and EPR analysis.
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Research context
OpenAlex topics: Quantum Dots Synthesis And Properties · Advanced Photocatalysis Techniques · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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