Photocatalytic degradation of tetracycline antibiotics using delafossite silver ferrite-based Z-scheme photocatalyst: Pathways and mechanism insight
Tetracycline (TC), a widely used antibiotic, is easy to enter the aquatic ecosystem through soil erosion, livestock manure and wastewater discharge, resulting in a series of risks. The application of Z-scheme photocatalysts with efficient interface charge separation and transfer has been regard as a...
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Veröffentlicht in: | Chemosphere (Oxford) 2021-05, Vol.270, p.128651, Article 128651 |
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Sprache: | eng |
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Zusammenfassung: | Tetracycline (TC), a widely used antibiotic, is easy to enter the aquatic ecosystem through soil erosion, livestock manure and wastewater discharge, resulting in a series of risks. The application of Z-scheme photocatalysts with efficient interface charge separation and transfer has been regard as an effective strategy for antibiotic degradation. Herein, a novel ternary Z-scheme Bi12O17Cl2/Ag/AgFeO2 was successfully synthesized by ultrasound-assisted ethanol reduction of Ag+ on the interface of Bi12O17Cl2 and AgFeO2. The Bi12O17Cl2/Ag/AgFeO2 Z-scheme system exhibited an enhanced photocatalytic degradation capability for TC, which was over 6.5 times and 2.4 times higher than those of AgFeO2 and Bi12O17Cl2/AgFeO2 system, respectively. The photocatalytic process of TC was explored, and the results indicated that an optimum catalyst concentration of 0.5 g L−1 and a primeval pH (without adjustment) favored the degradation process, while the introduction of exogenous anions (CO32−, SO42− and NO3−) and organic matter (HA) supressed the degradation of TC. Simultaneously, the possible pathway for the degradation process of TC was presented based on the liquid chromatography-mass spectrometry (LC-MS) analysis. Active species trapping experiments and ESR spectra revealed the significant contribution of O2− in the TC degradation, and verified the Z-scheme mechanism of the Bi12O17Cl2/Ag/AgFeO2 system.
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•20-BAF possesses enhanced photocatalytic activity for tetracycline degradation.•Ag0 exhibits SPR effect for enhanced light absorption and acts as Z-scheme bridge.•Tetracycline was degraded into small organic compounds or entirely mineralized.•The smooth transfer of interface charges follows the Z-scheme pathway. |
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ISSN: | 0045-6535 1879-1298 |
DOI: | 10.1016/j.chemosphere.2020.128651 |