Study on the performance and mechanism of ARB and ARGs removal in wastewater by Vis/Cu0-MoS2/C3N4-EG enhanced peroxymonosulfate activation process
In this study,a floating copper-molybdenum bimetallic carbon nitride composite Cu0-MoS2/C3N4-EG was synthesized.A visible-light-assisted Cu0-MoS2/C3N4-EG activated PMS system(Vis/Cu0-MoS2/C3N4-EG/PMS)was developed for the removal of antibiotic-resistant bacteria(ARB)and antibiotic resistance genes(ARGs)from water.The results showed that this system could inactivate all tetracycline-resistant antibiotic-resistant bacteria(TC-ARB)within only 0.5 min,starting from an initial concentration of 5.4×107 CFU·mL-1,using a catalyst dosage of 0.22 g·L-1 and PMS dosage of 1 g·L-1.This system could destroy the cell membrane of TC-ARB,with the leaked DNA fragments further attacked by reactive oxygen species(ROS),which significantly reduce the horizontal transfer of TC-ARGs.Quenching test and electron paramagnetic resonance(EPR)analyses showed that the main active species included·OH,·SO4-and 1O2.For secondary effluent from an actual sewage treatment plant,this system achieved efficient disinfection within 2 minutes and greatly reduce the absolute abundance of various ARGs in the water.This study provide technical support and theoretical basis for the removal of TC-ARB and ARGs from whater.
NETL
NSTL
万方数据
