光催化
光化学
纳米片
兴奋剂
化学
化学工程
材料科学
可见光谱
碳纤维
辐照
纳米技术
载流子
催化作用
复合数
光电子学
有机化学
复合材料
核物理学
工程类
物理
作者
Xingxing Yang,Jiadi Sun,Lina Sheng,Ziyue Wang,Yongli Ye,Jiayu Zheng,Minghong Fan,Yinzhi Zhang,Xiulan Sun
标识
DOI:10.1016/j.jcis.2022.11.002
摘要
The emergence of widespread microbial contamination and drug-resistant bacteria in the water environment poses a severe threat to public health. Photocatalysis is considered an efficient, energy-saving, and cost-effective disinfection strategy for effectively removing microbial contamination from water bodies. In this paper, a metal-free O-doped g-C3N4/carbon dots (O-CN/CDs) nanosheet photocatalysts are prepared in coordination with various modification strategies, which results in a considerable improvement in photocatalytic disinfection activity compared to bulk g-C3N4 (B-CN). First, O-doping and morphology modulation are achieved simultaneously with hydrothermal treatment, which not only hinders the recombination of photogenerated hole-electron pairs, but also enables the exposure of more active centers. Subsequently, loading of CDs onto O-CN nanosheets by electrostatic self-assembly increases the production of photogenerated hole-electron pairs by expanding the visible light absorption region and promoted the separation of photogenerated carriers by trapping photogenerated electrons. Interestingly, the loading of CDs changes the charge on the surface of the composite photocatalyst from negative to positive, making it easier for the active species to come in contact with bacteria, and thus improving bacterial disinfection performance. Under visible light irradiation, the inactivation efficiency of optimized O-CN/CDs against methicillin-resistant Staphylococcus aureus (MRSA) is log(C/C0) = 4.08, approximately 9 times higher than that of B-CN. The main active species inactivating bacteria are superoxide anions radicals (•O2-) and photogenerated holes, and their attack causes damage to the membrane wall structure and leakage of intracellular components. Additionally, the feasibility of the as-prepared photocatalysts in water disinfection in real environments was confirmed by photocatalytic disinfection experiments in successive recovery cycles and in practical lake water.
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