AI Article Synopsis
- Researchers developed a new photocatalyst, Ag/Bi/BiOCO, that effectively kills antibiotic-resistant bacteria and degrades antibiotics in water using visible light.
- The catalyst demonstrated about 100% efficiency in eliminating AR-E. coli and 83.81% efficiency in degrading tetracycline (TC) within specific timeframes, while maintaining stability and reusability over multiple cycles.
- The study also identified key active substances involved in the photocatalytic processes, indicating that the catalyst has significant potential for addressing water contamination issues related to antibiotics and resistant bacteria.
Article Abstract
Currently, achieving dual applications of BiOCO-based photocatalysts in photocatalytic degradation and sterilization under visible-light conditions is challenging. In this study, a novel Ag/Bi/BiOCO visible-light photocatalyst with bimetallic doping and rich oxygen vacancies was successfully synthesized using a one-pot hydrothermal crystallization method. The existence of oxygen vacancies was verified by X-ray photoelectron spectroscopy (XPS) and Electron spin resonance (ESR) analysis. The experimental results showed that Ag/Bi/BiOCO killed ∼100% (log 7) of antibiotic-resistant Escherichia coli (AR-E. coli) within 60 min and degraded 83.81% of tetracycline (TC) within 180 min under visible light irradiation. Moreover, Ag/Bi/BiOCO can still remove 61.07% of TC in water after 5 cycles, showing excellent photocatalytic cycle stability and reusability. The possible degradation pathway of TC was determined by liquid chromatography-mass spectrometry. It was found that the main active substances in the photocatalytic disinfection of AR-E. coli were O, h, and ·OH, while O was the dominant active species in the photocatalytic degradation of TC. This study presents a promising BiOCO-based visible light photocatalyst for treating both antibiotics (TC) and antibiotic-resistant bacteria (AR-E. coli) in water.
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| http://dx.doi.org/10.1016/j.envres.2024.120313 | DOI Listing |
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