Graphite carbon nitride (g-C3N4) photocatalytic disinfection on a multidrug resistant E. coli strain from secondary effluent
QI Fei1, SUN Ying-xue1, CHANG Xue-ming1, YIN Xiu-feng1, LU Song-Liu2, HU Hong-ying3
1. Department of Environmental Science and Engineering, Beijing Technology and Business University, Beijing 100048, China;
2. Tus-Water Group Limited, Shanghai 200072, China;
3. State Key Joint Laboratory of Environmental Simulation and Pollution Control, State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, China
The inactivation effects of multi-drug resistant bacterium E. coli CGMCC 1.1595against tetracycline and ampicillin from secondary effluent by light irradiation and photocatalysis with graphite carbon nitride (g-C3N4) were studied. The results showed that the higher irradiation power of the mercury lamp (100/300/500W) with higher irradiation intensity could lead to higher inactivation efficiency. Under the inactivation by 500W mercury lamp irradiation of 60min, the inactivation rate of E. coli CGMCC 1.1595was 0.41log by ultraviolet A (UVA)-visible light (300~579nm) irradiation, and the inactivation rate was up to 1.31log by g-C3N4 photocatalysis. The contribution of g-C3N4 to the UVA-visible light inactivation was 61%~69% compared to that without g-C3N4 catalyst, while the contribution of g-C3N4 to the visible light inactivation was 60%~79%. The significance of the reactive oxygen species (ROS) and hole (h+) for the g-C3N4 photocatalytic inactivation of E. coli CGMCC 1.1595were also investigated, with the activity order as·OH >·O2- > H2O2 > h+ > 1O2. Hydroxyl radical (·OH) was a leading contributor to the irradiation, followed by·O2- and H2O2.
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