The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China.
Water Res. 2013 Apr 1;47(5):1837-47. doi: 10.1016/j.watres.2013.01.003. Epub 2013 Jan 11.
Ag(2)O/TNBs were fabricated by depositing Ag(2)O nanoparticles on the surface of TiO(2) nanobelts (TNBs). The disinfection activities of Ag(2)O/TNBs on two representative bacterial types: Gram-negative Escherichia coli ATCC15597 and Gram-positive Bacillus subtilis, were examined under both dark and visible light conditions. Ag(2)O/TNBs exhibited stronger bactericidal activities than Ag(2)O nanoparticles and TNBs under both dark and light conditions. For both cell types, disinfection effects of Ag(2)O/TNBs were greater under light conditions relative to those under dark conditions. The bactericidal mechanisms of Ag(2)O/TNBs under both dark and light conditions were explored. Ag(+) ions released from Ag(2)O/TNBs did not contribute to the bactericidal activity of Ag(2)O/TNBs under dark conditions, whereas the released Ag(+) ions showed bactericidal activity under visible light irradiation conditions. Active species (H(2)O(2), O(2)(-)·, and e(-)) generated by Ag(2)O/TNBs played important roles in the disinfection processes under both dark and visible light irradiation conditions. Without the presence of active species, the direct contact of Ag(2)O/TNBs with bacterial cells had no bactericidal effect.
Ag(2)O/TNBs 是通过将 Ag(2)O 纳米颗粒沉积在 TiO(2)纳米带（TNBs）表面而制备的。在黑暗和可见光条件下，研究了 Ag(2)O/TNBs 对两种代表性细菌类型：革兰氏阴性大肠杆菌 ATCC15597 和革兰氏阳性枯草芽孢杆菌的消毒活性。在黑暗和光照条件下，Ag(2)O/TNBs 的杀菌活性均强于 Ag(2)O 纳米颗粒和 TNBs。对于这两种细胞类型，与黑暗条件相比，Ag(2)O/TNBs 在光照条件下的消毒效果更好。在黑暗和光照条件下，Ag(2)O/TNBs 的杀菌机制都进行了探索。Ag(2)O/TNBs 释放的 Ag(+) 离子在黑暗条件下对 Ag(2)O/TNBs 的杀菌活性没有贡献，而在可见光照射条件下，释放的 Ag(+) 离子具有杀菌活性。Ag(2)O/TNBs 在黑暗和可见光照射条件下产生的活性物质（H(2)O(2)、O(2)(-)·和 e(-)）在消毒过程中起重要作用。没有活性物质的存在，Ag(2)O/TNBs 与细菌细胞的直接接触没有杀菌作用。
