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Role of dopant concentration, crystal phase and particle size on microbial inactivation of Cu-doped TiO_2 nanoparticles

机译：掺杂剂浓度，晶相和粒径对铜掺杂TiO_2纳米颗粒微生物失活的影响

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摘要

The properties of Cu-doped TiO_2 nanoparticles (NPs) were independently controlled in a flame aerosol reactor by varying the molar feed ratios of the precursors, and by optimizing temperature and time history in the flame. The effect of the physico-chemical properties (dopant concentration, crystal phase and particle size) of Cu-doped TiO_2 nanoparticles on inactivation of Mycobacterium smegmatis (a model pathogenic bacterium) was investigated under three light conditions (complete dark, fluorescent light and UV light). The survival rate of M. smegmatis (in a minimal salt medium for 2h) exposed to the NPs varied depending on the light irradiation conditions as well as the dopant concentrations. In dark conditions, pristine TiO_2 showed insignificant microbial inactivation, but inactivation increased with increasing dopant concentration. Under fluorescent light illumination, no significant effect was observed for TiO_2. However, when TiO _2 was doped with copper, inactivation increased with dopant concentration, reaching more than 90% (>3wt% dopant). Enhanced microbial inactivation by TiO_2 NPs was observed only under UV light. When TiO_2 NPs were doped with copper, their inactivation potential was promoted and the UV-resistant cells were reduced by over99%. In addition, the microbial inactivation potential of NPs was also crystal-phase-and size-dependent under all three light conditions. A lower ratio of anatase phase and smaller sizes of Cu-doped TiO_2 NPs resulted in decreased bacterial survival. The increased inactivation potential of doped TiO _2 NPs is possibly due to both enhanced photocatalytic reactions and leached copper ions.
机译：通过改变前驱体的摩尔进料比，并优化火焰中的温度和时间历史，可在火焰气溶胶反应器中独立控制Cu掺杂的TiO_2纳米颗粒（NPs）的性能。在三种光条件下（完全暗，荧光和紫外光）研究了掺杂铜的TiO_2纳米颗粒的理化性质（掺杂剂浓度，晶相和粒径）对耻垢分枝杆菌（一种模型致病菌）的失活的影响。 ）。暴露于NPs的耻垢分枝杆菌的存活率（在最小盐介质中2小时）取决于光照射条件和掺杂剂浓度。在黑暗条件下，原始TiO_2表现出微不足道的微生物失活，但随着掺杂浓度的增加，其失活增加。在荧光灯照明下，未观察到TiO_2的显着影响。然而，当TiO _2掺杂铜时，失活程度随掺杂剂浓度的增加而增加，达到90％以上（> 3wt％的掺杂剂）。仅在紫外光下观察到TiO_2 NP增强了微生物的灭活作用。当TiO_2 NPs掺有铜时，它们的失活潜力得到增强，抗紫外线细胞减少了99％以上。另外，在所有三种光照条件下，NPs的微生物失活潜力也都取决于晶体的相位和大小。较低的锐钛矿相比例和较小的Cu掺杂TiO_2 NP尺寸导致细菌存活率降低。掺杂的TiO _2 NPs的失活潜力增加可能是由于增强的光催化反应和浸出的铜离子。

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