期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 224, 期 -, 页码 175-182出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2017.10.052
关键词
Ag/TiO2-N photocatalyst; Supercritical solvothermal process; Synergistic effect; Antibacterial activity; Acinetobacter baumannii
资金
- NSFC [21237003, 21577092, 811012310]
- Ministry of Education of China [PCSIRT_IRT_16R49]
- International Joint Laboratory on Resource Chemistry (IJLRC)
- Shanghai Government [15520711300]
- Medical Guide Program of the Shanghai Science and Technology Committee [14411970500]
The hybrid Ag/TiO2-N photocatalyst was prepared via a supercritical solvothermal process in ethanol fluid. The simultaneous achievement of reduction of Ag+ ions and N-doping in silver-ammonia complex solution led to the uniform distribution of Ag nanoparticles stably combined with the surface of TiO2-N substrate. As a result, the visible-light photocatalytic inactivation of Acinetobacter batunannff was facilitated via the enhanced visible light harvesting and the high separation efficiency of photo-induced charge carriers. By means of the main active species of center dot O-2(-) radical, the synergistic effect of Ag nanoparticles and TiO2-N could induce the structure change of bacteria with the leakage of K+ ions as well as the mineralization of cell membrane with the elimination of self-repair function, leading to the final cell death. In comparison, the bactericidal activity of Ag nanoparticles and TiO2-N under UV light irradiation was due to the intrinsic efficiency and the high light harvesting, respectively. The photothermal effect of Ag nanoparticles in the near-IR light region could be possibly remained by TiO2-N substrate to achieve the antibacterial activity. Furthermore, Ag/TiO2-N photocatalyst played great bactericidal effect for kinds of bacteria, implying the applicable future to the medical disinfection.
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