Abstract
Visible light-driven environmentally friendly ZnO semiconductor for durable photocatalytic disinfection and purification of drinking water is very promising.However,the high requirement in ultraviolet absorption and rapid recombination velocity of the photogenerated electron-hole severely hamper the sustainable implementation of ZnO in photocatalysis.Herein,by one"two birds with one stone"strategy,Fe-doping ZnO por-ous nanosheets(Fe-ZnOPN)composed of ultrafine nanoparticles can be constructed by hydrothermal synthesis of basic zinc carbonate and controlled low-temperature pyrolytic methods.By highly concentrated Fe-doping effect(＞7 wt％),the tailoring ZnO nanograin size(～10nm)and rich oxygen vacancy of catalyst were accessed by ion/vacancy diffusion and nanocrystal rear-rangement,superior to the ZnO porous nanosheets(～37 nm).The obtained Fe-ZnOPN were endowed with a larger specific surface area,improved visible light har-vesting ability,light response and separation of charge carriers.Such characters allowed the resulting catalyst to afford a 100％bactericidal efficiency against Pseudomonas aeruginosa and Staphylococcus aureus under visible light irradiation(＞420 nm).Impressively,the Fe-ZnOPN could show practical disinfection ability in different water resources and multiple reuse ability.The mechanism study revealed that excellent photocatalytic disinfection perfor-mance of Fe-ZnOPN correlated with the in situ generated active oxidative substances,destruction of bacterial biofilm and resulting nucleic acids leakage,thereby causing irre-versible physical damage.This study provided a new ref-erence for designing environmentally friendly photocatalytic sterilization materials and disinfectants,which can be used in the practical disinfection of drinking water.
维普
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