Insight into typical photo-assisted AOPs for the degradation of antibiotic micropollutants: Mechanisms and research gaps

Due to the incomplete elimination by traditional wastewater treatment, antibiotics are becoming emerging contaminants, which are proved to be ubiquitous and promote bacterial resistance in the aquatic systems. Antibiotic pollution has raised particular concerns, calling for improved methods to clean...

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Published in:Chemosphere (Oxford) 2023-12, Vol.343, p.140211-140211, Article 140211
Main Authors: Zheng, Jinshuai, Zhang, Peng, Li, Xuanyan, Ge, Linke, Niu, Junfeng
Format: Article
Language:English
Subjects:
Antibiotics
Degradation kinetics
Photo-assisted AOPs
Transformation pathways
Wastewater treatment
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Summary:Due to the incomplete elimination by traditional wastewater treatment, antibiotics are becoming emerging contaminants, which are proved to be ubiquitous and promote bacterial resistance in the aquatic systems. Antibiotic pollution has raised particular concerns, calling for improved methods to clean wastewater and water. Photo-assisted advanced oxidation processes (AOPs) have attracted increasing attention because of the fast reaction rate, high oxidation capacity and low selectivity to remove antibiotics from wastewater. On the basis of latest literature, we found some new breakthroughs in the degradation mechanisms of antibiotic micropollutants with respect to the AOPs. Therefore, this paper summarizes and highlights the degradation kinetics, pathways and mechanisms of antibiotics degraded by the photo-assisted AOPs, including the UV/O3 process, photo-Fenton technology, and photocatalysis. In the processes, functional groups are attacked by hydroxyl radicals, and major structures are destroyed subsequently, which depends on the classes of antibiotics. Meanwhile, their basic principles, current applications and influencing factors are briefly discussed. The main challenges, prospects, and recommendations for the improvement of photo-assisted AOPs are proposed to better remove antibiotics from wastewater. [Display omitted] •Mechanisms on antibiotics degradation by photo-assisted AOPs are summarized•Photo-assisted AOPs effectively remove antibiotics via •OH from wastewater•Factors such as pH values will affect the removal efficiency of antibiotics•Different classes of antibiotics have dissimilar degradation pathways and mechanisms•Economic, stable, recyclable and combined photo-assisted AOPs should be developed
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2023.140211