{"title":"Remote Bactericidal Effect of Anatase TiO<sub>2</sub> Photocatalytic Nanoparticles Annealed with Low-Temperature O<sub>2</sub> Plasma.","authors":"Retsuo Kawakami, Yuki Takao, Akihiro Shirai, Takashi Mukai","doi":"10.4265/bio.27.217","DOIUrl":null,"url":null,"abstract":"<p><p>The remote bactericidal effect of TiO<sub>2</sub> photocatalyst, i.e., the bactericidal effect away from the photocatalyst, was successfully achieved using a humidified airflow. The TiO<sub>2</sub> photocatalyst used was anatase-type TiO<sub>2</sub> nanoparticles (NPs) annealed with a low-temperature O<sub>2</sub> plasma. For comparison, anatase-type TiO<sub>2</sub> NPs annealed in the air were used. The bacteria, Bacillus subtilis, were placed away from the TiO<sub>2</sub> NPs. The plasma-assisted-annealed TiO<sub>2</sub> NPs significantly inactivated 99% of the bacterial cells in 5 h, whereas the pristine and air-annealed TiO<sub>2</sub> NPs inactivated 88-90% of the bacterial cells. The remote bactericidal effect of plasmaassisted-annealed TiO<sub>2</sub> NPs would be attributed to a larger amount of H<sub>2</sub>O<sub>2</sub> molecules traveled by the airflow from the TiO<sub>2</sub> NPs. The molecules were generated by chemically reacting more photoexcited carriers on the TiO<sub>2</sub> surface with H<sub>2</sub>O and O<sub>2</sub> in the airflow. These photoexcited carriers originated from more oxygen-based species adsorbed and more oxygen vacancies introduced on the TiO<sub>2</sub> surface by the plasma-assisted-annealing.</p>","PeriodicalId":8777,"journal":{"name":"Biocontrol science","volume":"27 4","pages":"217-222"},"PeriodicalIF":0.9000,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biocontrol science","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.4265/bio.27.217","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOTECHNOLOGY & APPLIED MICROBIOLOGY","Score":null,"Total":0}
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.
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.