【摘要】 在近紫外光的照射下,对比研究超细纳米TiO2与DegussaP25型TiO2光催化的灭菌效果.结果表明,粒径更小,比表面积更大的超细TiO2有助于提高光催化活性,能更有效地杀灭大肠杆菌.采用脉冲等强度均一电场凝胶电泳的研究表明,纳米TiO2光催化能诱导大肠杆菌染色体DNA双链发生严重断裂.更多还原

【Abstract】 Under the irradiation of near-UV light, the photocatalytic bactericidal activities of the ultrafine titanium dioxide （TiO₂） nanoparticles and Degussa P25 TiO₂ are studied. The results indicate that the ultrafine TiO₂ exhibits stronger bactericidal activity for E.coli than the P25 TiO₂. The fact is due to the reasons that the ultrafine TiO₂nanoparticles has smaller sizes, higher surface area to volume ratios, which enhances the photoactivity of nano-photocatalysts. The results of contour-clamped homogeneous electric pulsed-field gel electrophoresis provide the evidence that the chromosomes DNA of E.coli are badly damaged by the photocatalytsis of the TiO₂ nanoparticles.更多还原