Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 290, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.120881
Keywords
Tetracycline degradation; Photocatalytic activity; DFT calculation; Degradation pathways; S-scheme MoSe2/AgBr heterojunction
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Funding
- National Natural Science Foundation of China [21707021]
- Natural Science Foundation of Guangxi Province [2020GXN, SFAA297034]
- Open Fund of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [KF201723, 2019KF19]
- Foundation of Research Project of Bosch Branch of Guangxi University Graduate School [GXU-BFY-2020-036]
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In this study, S-scheme MoSe2/AgBr heterojunctions were synthesized and used for the degradation of antibiotics. The photocatalysts exhibited efficient carriers' separation and strong redox potential. The degradation efficiency of tetracycline using the synthesized photocatalyst was superior to other counterparts, and it also showed great stability and excellent antibacterial effect.
Development of efficient and stable photocatalysts is of essential for photocatalytic degradation of refractory organics in wastewaters. Herein, the novel S-scheme MoSe2/AgBr (MS/AB) heterojunctions were synthesized for antibiotics degradation. Various characterization results showed that the S-scheme MS/AB photocatalysts exhibited efficient carriers' separation and strong redox potential. Tetracycline (TC) (20 mg/L) degradation efficiency of 81.4% was achieved using the 5MS/AB within 90 min at pH of 9, superior to those of the counterparts. Photogenerated carriers' transfer and photocatalytic reaction mechanism of the S-scheme MoSe2/AgBr heterojunction were deduced by DFT calculation, in-situ XPS and work function calculation. Moreover, possible degradation pathways of TC were proposed based on identified intermediates, and most of the intermediates showed lower toxicity than that of TC. The 5MS/AB photocatalyst also showed great stability and excellent antibacterial effect. This study advances the design of efficient photocatalysts and enriches related mechanisms.
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