Elimination of representative antibiotic-resistant bacteria, antibiotic resistance genes and ciprofloxacin from water via photoactivation of periodate using FeS 2

• Published in: Journal of hazardous materials Vol. 476; p. 134982
• Main Authors: Liu, Fuyang, Shen, Yutao, Hou, Yanghui, Wu, Jingfeng, Ting, Yong, Nie, Chenyi, Tong, Meiping
• Format: Journal Article
• Language: English
• Published: Netherlands 05.09.2024
• Subjects: Anti-Bacterial Agents - chemistry; Anti-Bacterial Agents - pharmacology; Bacteria - drug effects; Bacteria - genetics; Bacteria - metabolism; Bacteria - radiation effects; Ciprofloxacin - pharmacology; Disinfection - methods; Drug Resistance, Bacterial - genetics; Escherichia coli - drug effects; Escherichia coli - genetics; Ferrous Compounds - chemistry; Ferrous Compounds - pharmacology; Gene Transfer, Horizontal; Sunlight; Water Microbiology; Water Pollutants, Chemical; Water Purification - methods; FeS; Antibiotic-resistant bacteria; Antibiotic resistance genes; Periodate photoactivation; Ciprofloxacin degradation
• ISSN: 1873-3336

The propagation of antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) induced by the release of antibiotics poses great threats to ecological safety and human health. In this study, periodate (PI)/FeS /simulated sunlight (SSL) system was employed to remove representative ARB, ARGs and antibiotics in water. 1 × 10 CFU mL of gentamycin-resistant Escherichia coli was effectively disinfected below limit of detection in PI/FeS /SSL system under different water matrix and in real water samples. Sulfadiazine-resistant Pseudomonas and Gram-positive Bacillus subtilis could also be efficiently sterilized. Theoretical calculation showed that (110) facet was the most reactive facet on FeS to activate PI for the generation of reactive species (·OH, ·O , h and Fe(IV)=O) to damage cell membrane and intracellular enzyme defense system. Both intracellular and extracellular ARGs could be degraded and the expression levels of multidrug resistance-related genes were downregulated during the disinfection process. Thus, horizontal gene transfer (HGT) of ARB was inhibited. Moreover, PI/FeS /SSL system could disinfect ARB in a continuous flow reactor and in an enlarged reactor under natural sunlight irradiation. PI/FeS /SSL system could also effectively degrade the HGT-promoting antibiotic (ciprofloxacin) via hydroxylation and ring cleavage process. Overall, PI/FeS /SSL exhibited great promise for the elimination of antibiotic resistance from water.