Coupled homogeneous/heterogeneous Fenton-like system for enhanced inactivating of tetracycline-resistance Salmonella typhi
The invasion of antibiotic resistance bacteria(ARB)from the discharge of antibiotics is an emerging challenge to ecological environment.Fenton-like reactions based on the activation of peroxymonosulfate(PMS)by homogeneous and heterogeneous systems have been extensively studied in the degradation of tetracycline(TC)in water,however,there are few studies on the inactivating of tetracycline resistant bacteria.It was found that the homogeneous Cu(Ⅱ)/PMS system with coexisting Cu(Ⅱ)and TC to form cupric complex activated PMS could effectively inactivate tetracycline resistant Salmonella typhi(TRST),but the inactivation efficiency was only about 52%.After adding N/S co-doped magnetic carbon(N/S-MC)to Cu(Ⅱ)-TC-TRST ternary contaminants,the heterogeneous N/S-MC/PMS system could realize the superposition on the effect of homogeneous Cu(Ⅱ)/PMS system and greatly promote the inactivation of TRST.Despite the competition of Cu(Ⅱ)and TC,the coupling homogeneous and heterogeneous Fenton-like system could enhance the inactivation efficiency of TRST in the complex polluted water,and that increased to more than 99%.The ROS produced by Fenton-like reaction destroyed the cell membrane,cell wall and drug resistance genes(ARGs)of TRST,furthermore prevented its horizontal transfer.In the homogeneous and heterogeneous Fenton-like systems,both free radical(·SO4-,·OH,·O2-)and non-free radical(1O2)pathways participated in the inactivating of TRST,but exhibited the dominant role of free radicals.In this paper,a coupled homogeneous and heterogeneous Fenton-like system was proposed,which showed good efficacy in inactivating ARB in water.
Fenton-like reactionperoxymonosulfatehomogeneous and heterogeneousantibiotic resistance bacteriacarbon-based catalyst
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