Bactericidal efficiency and photochemical mechanisms of micro/nano bubble-enhanced visible light photocatalytic water disinfection
文献类型： 外文期刊
作者： Fan, Wei 1 ; Cui, Jingyu 1 ; Li, Qi 1 ; Huo, Yang 2 ; Xiao, Dan 3 ; Yang, Xia 1 ; Yu, Hongbin 1 ; Wang, Chunliang 2 ; Jarvis 1 ;
作者机构： 1.Northeast Normal Univ, Sch Environm, 2555 Jingyue St, Changchun 130117, Peoples R China
2.Northeast Normal Univ, Natl Demonstrat Ctr Expt Phys Educ, Changchun 130024, Peoples R China
3.Jilin Acad Agr Sci, 1363 Shengtai St, Changchun 130033, Peoples R China
4.Cranfield Univ, Cranfield Water Sci Inst, Coll Rd, Cranfield MK43 0AL, Beds, England
关键词： Light scattering; Microbial spores; Nanobubble technology; Photodegradation; Reactive oxygen species
期刊名称：WATER RESEARCH （ 影响因子：11.236； 五年影响因子：11.547 ）
ISSN： 0043-1354
年卷期： 2021 年 203 卷
页码：
收录情况： SCI
摘要： Microbial contamination of water in the form of highly-resistant bacterial spores can cause a long-term risk of waterborne disease. Advanced photocatalysis has become an effective approach to inactivate bacterial spores due to its potential for efficient solar energy conversion alongside reduced formation of disinfection by-products. However, the overall efficiency of the process still requires significant improvements. Here, we proposed and evaluated a novel visible light photocatalytic water disinfection technology by its close coupling with micro/nano bubbles (MNBs). The inactivation rate constant of Bacillus subtilis spores reached 1.28 h(-1), which was 5.6 times higher than that observed for treatment without MNBs. The superior performance for the progressive destruction of spores' cells during the treatment was confirmed by transmission electron microscopy (TEM) and excitation-emission matrix (EEM) spectra determination. Experiments using scavengers of reactive oxygen species (ROSs) revealed that H2O2 and center dot OH were the primary active species responsible for the inactivation of spores. The effective supply of oxygen from air MNBs helped accelerate the hole oxidation of H2O2 on the photocatalyst (i.e. Ag/TiO2). In addition, the interfacial photoelectric effect from the MNBs was also confirmed to contribute to the spore inactivation. Specifically, MNBs induced strong light scattering, consequently increasing the optical path length in the photocatalysis medium by 54.8% at 700nm and enhancing light adsorption of the photocatalyst. The non-uniformities in dielectricity led to a high-degree of heterogeneity of the electric field, which triggered the formation of a region of enhanced light intensity which ultimately promoted the photocatalytic reaction. Overall, this study provided new insights on the mechanisms of photocatalysis coupled with MNB technology for advanced water treatment.
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