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Synergistic Ag/TiO2-N photocatalytic system and its enhanced antibacterial activity towards Acinetobacter baumannii
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2017-10-26 , DOI: 10.1016/j.apcatb.2017.10.052
Guoxiang Yang , Haibo Yin , Wenhua Liu , Yuping Yang , Quan Zou , Liulin Luo , Huiping Li , Yuning Huo , Hexing Li

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 baumannii 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 O2 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.



中文翻译:

Ag / TiO 2 -N协同光催化体系及其对鲍曼不动杆菌的增强抗菌活性

通过超临界溶剂热法在乙醇溶液中制备Ag / TiO 2 -N杂化光催化剂。银氨络合物溶液中同时实现了Ag +离子的还原和N掺杂的还原,使得Ag纳米颗粒与TiO 2 -N基体表面稳定结合而分布均匀。结果,鲍曼不动杆菌的可见光光催化失活通过增强的可见光收集和光诱导的电荷载体的高分离效率而得到促进。由主要活性物质的手段ö 2 -基团,Ag的协同效果纳米粒子和TiO2 -N可以通过K +离子的渗漏诱导细菌的结构变化,并通过消除自我修复功能而使细胞膜矿化,从而导致最终的细胞死亡。相比之下,Ag纳米颗粒和TiO 2 -N在紫外光照射下的杀菌活性分别是由于其固有效率和高集光率所致。TiO 2 -N衬底可能会保留Ag纳米粒子在近红外光区域的光热效应,以实现抗菌活性。此外,Ag / TiO 2 -N光催化剂对多种细菌起着很大的杀菌作用,暗示了其在医疗消毒中的应用前景。

更新日期:2017-10-26
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