Mechanistic insights for efficient inactivation of antibiotic resistance genes:a synergistic interfacial adsorption and photocatalytic-oxidation process

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2020,（24）
• 所属期刊栏目: ARTICLES
• 页码范围: 2107-2119
• 页数: 13页
• 语种: 英文

摘要

Advanced oxidation processes(AOPs)have been applied to address multiple environmental concerns including antibiotic resistance genes(ARGs).ARGs have shown an increasing threat to human health,and they are either harbored by antibiotic-resistant bacteria(ARB)or free in the environment.However,the control of ARGs has been substantially limited by their low concentration and the limited knowledge about their interfacial behavior.Herein,a novel AOP catalyst,Ag/TiO2/graphene oxide(GO),combined with a polyvinylidene fluoride(PVDF)ultrafiltration membrane was designed with a synergis-tic interfacial adsorption and oxidation function to inactivate ARGs with high efficiency in both model solutions and in secondary wastewater effluent,especially when the residue concentration was low.Further analysis showed that the mineralization of bases and phosphodiesters mainly caused the inacti-vation of ARGs.Moreover,the interfacial adsorption and oxidation processes of ARGs were studied at the molecular level.The results showed that GO was rich in sp2 backbones and functional oxygen groups,which efficiently captured and enriched the ARGs via π-π interactions and hydrogen bonds.Therefore,the photogenerated active oxygen species attack the ARGs by partially overcoming the kinetic problems in this process.The Ag/TiO2/GO catalyst was further combined with a PVDF membrane to test its poten-tial in wastewater treatment applications.This work offers an efficient method and a corresponding material for the inactivation and mineralization of intra/extracellular ARGs.Moreover,the molecular-level understanding of ARG behaviors on a solid-liquid interface will inspire further control strategies of ARGs in the future.