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目的评价改良后的纳米TiO2光催化技术空气净化消毒机对白色葡萄球菌的消毒效果。方法改进纳米TiO2光催化空气净化消毒机的过滤网和纳米TiO2光催化反应器、增加活性炭吸附、增加电辅加热系统、增加负离子发生器、采用最优风面智能控制系统。用白色葡萄球菌在封闭实验室制成气雾,比较不同风速、不同时间点纳米光催化空气消毒机组消毒后残余细菌总数,以确定纳米光催化空气净化消毒机的消毒效果。结果改良纳米光催化空气净化消毒机风速为1 500 mm/s时,作用30 min、60 min和90 min对气雾室空气中白色葡萄球菌的杀菌率分别为99.98%、100%和100%,对照气雾室白色葡萄球菌自然衰亡率分别是24.65%、38.84%和58.24%,各时间点残余菌数与对照相比差异均有统计学意义(P<0.001)。消毒机风速为800 mm/s时,上述时间点的杀菌率分别为99.88%、99.99%和100%,残余菌数与对照组相比差异也均有统计学意义(P<0.001)。风速为1 500 mm/s与800 mm/s的试验组相比,仅30 min时间点杀菌率差异有统计学意义(P<0.001),其他时间点差异均无统计学意义(P>0.05)。结论改良的纳米光催化空气消毒机作用30 min可有效清除空气中的白色葡萄球菌,可用于公共场所空气消毒。
Objective To evaluate the disinfection effect of modified nano-TiO2 photocatalytic technology on air-purifying disinfection machine against Staphylococcus aureus. Methods to improve the nano-TiO2 photocatalytic air purification machine filter and nano-TiO2 photocatalytic reactor to increase the adsorption of activated carbon, an increase of electric auxiliary heating system, an increase of negative ion generator, using the optimal wind surface intelligent control system. Staphylococcus aureus in the closed laboratory made of aerosol, compared with different wind speed, different time points after the nano-photocatalytic air disinfection unit total number of residual bacteria to determine the nano-photocatalytic air purification disinfection effect. Results The results showed that the bactericidal rates of Staphylococcus aureus in the aerosol chamber were 99.98%, 100% and 100% at 30 min, 60 min and 90 min, respectively, when the air velocity was 1 500 mm / s. The natural decay rates of Staphylococcus aureus in control aerosol room were 24.65%, 38.84% and 58.24%, respectively. There were significant differences in residual bacteria numbers between control and control at each time point (P <0.001). The sterilizing rates at the above time points were 99.88%, 99.99% and 100%, respectively, when the sterilizer wind speed was 800 mm / s. The difference of residual bacteria number was also statistically significant (P <0.001) compared with the control group. Compared with the experimental group with wind speed of 1 500 mm / s and 800 mm / s, the sterilization rate was only significant at 30 min (P <0.001), but no significant difference at other time points (P> 0.05) . Conclusion The modified nano-photocatalytic air disinfection machine can effectively remove Staphylococcus aureus in the air for 30 min and can be used for air disinfection in public places.