Abstract
Many disinfection technologies have emerged recently in water treatment industry, which are designed to inactivate water pathogens with extraordinary efficiency and minimum side effects and costs. Current disinfection processes, including chlorination, ozonation, UV irradiation, and so on, have their inherent drawbacks, and have been proven ineffective under certain scenarios. Bacterial inactivation by noble metals has been traditionally used, and copper is an ideal candidate as a bactericidal agent owing to its high abundance and low cost. Building on previous findings, we explored the bactericidal efficiency of Cu(I) and attempted to develop it into a novel water disinfection platform. Nanosized copper ferrite was synthesized, and it was reduced by hydroxylamine to form surface bound Cu(I) species. Our results showed that the generated Cu(I) on copper ferrite surface could inactivate E. coli at a much higher efficiency than Cu(II) species. Elevated reactive oxygen species’ content inside the cell primarily accounted for the strong bactericidal role of Cu(I), which may eventually lead to enhanced oxidative stress towards cell membrane, DNA, and functional proteins. The developed platform in this study is promising to be integrated into current water treatment industry.
Highlights
Water pathogens are a great concern that threaten the safety of public drinking water
The results suggested that the incubation of CuFe2O4 and CuFe2O4/NH2OH with E. coli cells could increase the ROS content by comparison with the control (Figure 7)
MOPS buffer at pH 7 we4r.eCouncsluesdion.s In this study, we showed that the antibacterial capability of CuFe2O4 nanomaterial could be significantly enhanced after addition of hydroxylamine
Summary
Water pathogens are a great concern that threaten the safety of public drinking water. Most of the currently used water disinfection methods are chlorination, ozonation, and UV irradiation, and so on, all of which have significant drawbacks [4,5,6,7,8]. Chlorination byproducts after reaction with organic compounds in water are reported to be carcinogenic and are not generally avoided around the world [9,10]. It has to be noted that water pathogens are observed to develop resistance to those traditional disinfection technologies, including chlorination/chloramination [13,14,15], ozonation [16,17,18], and UV irradiation [19,20,21]. The development of more potent and environmentally-friendly techniques is necessary
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