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Photocatalytic degradation of antibiotic sulfamethizole by visible light activated perovskite LaZnO. | LitMetric

Photocatalytic degradation of antibiotic sulfamethizole by visible light activated perovskite LaZnO.

J Environ Sci (China)

Optical Materials Research Group, Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh City, Viet Nam; Faculty of Applied Technology, School of Technology, Van Lang University, Ho Chi Minh City, Viet Nam. Electronic address:

Published: October 2024

AI Article Synopsis

  • - The study synthesized LaZnO perovskite using a sol-gel method for photocatalytic degradation of sulfamethizole (SMZ) antibiotics under visible light, achieving 99.2% degradation in 4 hours at an optimal dosage of 1.1 g/L.
  • - LaZnO's efficiency is due to its ability to absorb a wide range of light and its energy band structure, which helps produce reactive agents like ·O, h, and ·OH necessary for degrading SMZ.
  • - The research identified three degradation pathways of SMZ and confirmed the low toxicity of degradation intermediates via QSAR, demonstrating LaZnO's potential as a sustainable solution for antibiotic treatment without harming the ecosystem

Article Abstract

In this work, the perovskite LaZnO was synthesized via sol-gel method and applied for photocatalytic treatment of sulfamethizole (SMZ) antibiotics under visible light activation. SMZ was almost completely degraded (99.2% ± 0.3%) within 4 hr by photocatalyst LaZnO at the optimal dosage of 1.1 g/L, with a mineralization proportion of 58.7% ± 0.4%. The efficient performance of LaZnO can be attributed to its wide-range light absorption and the appropriate energy band edge levels, which facilitate the formation of active agents such as ·O, h, and ·OH. The integration of RP-HPLC/Q-TOF-MS and DFT-based computational techniques revealed three degradation pathways of SMZ, which were initiated by the deamination reaction at the aniline ring, the breakdown of the sulfonamide moieties, and a process known as Smile-type rearrangement and SO intrusion. Corresponding toxicity of SMZ and the intermediates were analyzed by quantitative structure activity relationship (QSAR), indicating the effectiveness of LaZnO-based photocatalysis in preventing secondary pollution of the intermediates to the ecosystem during the degradation process. The visible-light-activated photocatalyst LaZnO exhibited efficient performance in the occurrence of inorganic anions and maintained high durability across multiple recycling tests, making it a promising candidate for practical antibiotic treatment.

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Source
http://dx.doi.org/10.1016/j.jes.2023.08.004DOI Listing

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