TiO2 nanotubes/Ti plates modified by silver–benzene with enhanced photocatalytic antibacterial properties†,New Journal of Chemistry

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TiO2 nanotubes/Ti plates modified by silver–benzene with enhanced photocatalytic antibacterial properties†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1039/c7nj03554c
Masoud Faraji _{1,

2,

3,

4,

5} , Neda Mohaghegh _{6,

7,

8,

9,

10} , Amir Abedini _{2,

11,

12,

13,

14}

Affiliation

A novel Ag/Benzene-Mod/TiO₂ nanotubes/Ti plate was fabricated via photo-modification by benzene, followed by electrodeposition of Ag on the TiO₂ nanotubes/Ti plate. The antibacterial property and related mechanism of the prepared plates for the Escherichia coli (E. coli) as model bacteria were investigated in dark, UV and visible light irradiation conditions. Bactericidal tests showed that the antibacterial efficiency was the highest for Ag/Benzene-Mod/TiO₂ nanotubes/Ti plates under both UV and visible light irradiation. However, this modified plate did not exhibit any antibacterial properties in the dark. The enhanced antibacterial activity of the modified plates indicated that not only the plasmonic properties but also effective charge separation were responsible for overall bacteria-death. Scanning electron microscopy (SEM) observation provided evidence of the cellular internalization as well as the loss of integrity of cell walls in the presence of the most active plates. Collectively, the antibacterial mechanism of Ag/Benzene-Mod/TiO₂ nanotubes/Ti plate could be related to the photoabsorption properties (broader LSPR) of Ag under visible light irradiation, and subsequent formation of free radicals, which destroy the integrity of cell walls, resulting in the death of bacteria.

中文翻译：

银苯改性的 TiO ₂纳米管/钛板具有增强的光催化抗菌性能†

一种新型的Ag /苯-MOD /二氧化钛_2个纳米管/ Ti板，制作通过由苯照片修饰，随后银电沉积上的TiO _2个纳米管/ Ti板。的抗菌性和用于所制备的板的相关机制大肠杆菌（大肠杆菌）作为模型细菌在黑暗中，UV和可见光照射条件的影响。杀菌测试表明，Ag /苯-Mod / TiO ₂的抗菌效率最高紫外线和可见光照射下的碳纳米管/钛板。但是，这种修饰的板在黑暗中没有表现出任何抗菌性能。修饰板的增强的抗菌活性表明，不仅等离子特性，而且有效的电荷分离都是造成总体细菌死亡的原因。扫描电子显微镜（SEM）观察提供了在最活跃的板存在下细胞内在化以及细胞壁完整性丧失的证据。总而言之，Ag /苯改性/ TiO ₂的抗菌机理纳米管/钛板可能与可见光照射下银的光吸收特性（更广泛的LSPR）以及随后形成的自由基有关，这些自由基破坏细胞壁的完整性，导致细菌死亡。

更新日期：2017-12-26

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