纳米TiO2-光催化灭活水中噬菌体MS2

提出了一种简易的水中病毒灭活方法,以噬菌体MS2为模式病毒,探讨了紫外光照射时间、TiO2浓度、紫外光强度对自来水中MS2灭活效率的影响;评价了太阳光代替紫外光用于光催化灭活病毒的可行性.研究结果表明,聚乙烯(PE)材质的样品袋能更好地透过紫外光;紫外光照射6h,50mg/L的TiO2可以灭活自来水中7.95Log的MS2;紫外光强度在45μW/m2以下时,灭活率随强度的提高而增加;在溪水中,50mg/L的TiO2仅有4.87Log的灭活效率. 在太阳光下,50mg/L的TiO2在自来水和溪水中对MS2的灭活效率差异不明显,都达到了6.1Log以上,表明太阳光-TiO2灭活水中的病毒可行且高效.

Inactivation of bacteriophage MS2 in water by TiO2 nanoparticles coupled with light

A simple inactivation method of viruses in water was presented in this study by using bacteriophage MS2 as the model virus. Effects of irradiation time, concentration of TiO2 and light intensity of ultraviolet on removal efficiency of MS2 were discussed, and the feasibility of sunlight instead of ultravioletapplied to inactivate virus was evaluated. The results showed that higher transmittance of ultravioletwas obtained for the polyethylene (PE) sample bag; 7.95 Log of MS2 in tapwater was inactivated after 6hour’s irradiation of ultraviolet at the concentration of 50mg/L of TiO2; inactivation rate increased with the increasing light intensity below 45μW/m2. By comparison, 4.87 Log of MS2 in creek water was inactivatedat the concentration of 50mg/L of TiO2 under ultraviolet. However, 6.1 Log removal efficiency of MS2 in either tapwater or creek water was achieved under sunlight at the same concentration of TiO2, indicating that TiO2 coupled with sunlight is a sound method to inactivate the virus in water.