Study on the disinfection effect and influencing factors of a photocatalytic disinfection machine
Objective To study the disinfection effect and influencing factors of a photocatalytic disinfection machine on the air and surface of objects in an mist chamber under experimental conditions.Methods Air disinfection simulation field experiments and carrier quantitative killing test methods were used to observe the disinfection effect of a certain photocatalytic disinfection machine on laboratory air,fabric,and flat carrier.The method of comparing the number of bacterial colonies in each group using plate staining was used to explore whether there are disinfection factors produced in the air.Results The main disinfection factor of this photocatalytic disinfection machine was titanium dioxide,supplemented by metals such as rhodium and silver as photocatalysts.Under broad-spectrum ultraviolet irradiation and circulating wind conditions,the killing rate of Staphylococcus albus in air reached over 99.90％after 30 min of disinfection.Increasing the circulating air volume to 2 h,resulted in a 38.36％killing rate of Staphylococcus aureus on the fabric,but did not achieve the disinfection effect.The killing rates of Staphylococcus aureus on the agar plate after 4,6,and 8 h of disinfection were 93.17％,95.36％,and 97.06％,respectively.Conclusion The photocatalytic disinfection machine has a good disinfection effect on air in aerosol chamber,and the disinfection efficiency is positively correlated with the circulating air volume.
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