Remote Bactericidal Effect of Anatase TiO2 Photocatalytic Nanoparticles Annealed with Low-Temperature O2 Plasma.

IF 0.9 4区 农林科学 Q4 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Retsuo Kawakami, Yuki Takao, Akihiro Shirai, Takashi Mukai
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引用次数: 1

Abstract

The remote bactericidal effect of TiO2 photocatalyst, i.e., the bactericidal effect away from the photocatalyst, was successfully achieved using a humidified airflow. The TiO2 photocatalyst used was anatase-type TiO2 nanoparticles (NPs) annealed with a low-temperature O2 plasma. For comparison, anatase-type TiO2 NPs annealed in the air were used. The bacteria, Bacillus subtilis, were placed away from the TiO2 NPs. The plasma-assisted-annealed TiO2 NPs significantly inactivated 99% of the bacterial cells in 5 h, whereas the pristine and air-annealed TiO2 NPs inactivated 88-90% of the bacterial cells. The remote bactericidal effect of plasmaassisted-annealed TiO2 NPs would be attributed to a larger amount of H2O2 molecules traveled by the airflow from the TiO2 NPs. The molecules were generated by chemically reacting more photoexcited carriers on the TiO2 surface with H2O and O2 in the airflow. These photoexcited carriers originated from more oxygen-based species adsorbed and more oxygen vacancies introduced on the TiO2 surface by the plasma-assisted-annealing.

低温O2等离子体退火锐钛矿型TiO2光催化纳米颗粒的远程杀菌效果
利用加湿气流成功地实现了TiO2光催化剂的远程杀菌效果,即远离光催化剂的杀菌效果。TiO2光催化剂为锐钛矿型TiO2纳米粒子(NPs),经低温O2等离子体退火。为了进行比较,我们采用了在空气中退火的锐钛矿型TiO2 NPs。将枯草芽孢杆菌放置在远离TiO2 NPs的地方。等离子体辅助退火的TiO2 NPs在5 h内显著灭活了99%的细菌细胞,而原始和空气退火的TiO2 NPs在5 h内灭活了88-90%的细菌细胞。等离子体辅助退火TiO2 NPs的远距离杀菌作用可能是由于来自TiO2 NPs的气流携带了大量的H2O2分子。这些分子是由TiO2表面更多的光激发载流子与气流中的H2O和O2发生化学反应而产生的。这些光激发载流子来源于更多的氧基物质吸附和等离子体辅助退火在TiO2表面引入更多的氧空位。
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来源期刊
Biocontrol science
Biocontrol science BIOTECHNOLOGY & APPLIED MICROBIOLOGY-
CiteScore
2.60
自引率
8.30%
发文量
21
审稿时长
>12 weeks
期刊介绍: The Biocontrol Science provides a medium for the publication of original articles, concise notes, and review articles on all aspects of science and technology of biocontrol.
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