Dataset Information

Synthesis of Mesoporous TiO?/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (? = 222 nm) Irradiation.

ABSTRACT: There is a need for highly efficient photocatalysts, particularly for water purification. In this study, we fabricated a mesoporous TiO? thin film on a boron-doped diamond (BDD) layer by a surfactant-assisted sol-gel method, in which self-assembled amphiphilic surfactant micelles were used as an organic template. Scanning electron microscopy revealed uniform mesopores, approximately 20 nm in diameter, that were hexagonally packed in the TiO? thin film. Wide-angle X-ray diffraction and Raman spectroscopy clarified that the framework crystallized in the anatase phase. Current?voltage (I?V) measurements showed rectification features at the TiO?/BDD heterojunction, confirming that a p?n hetero-interface formed. The as-synthesized mesoporous TiO?/BDD worked well as a photocatalyst, even with a small volume of TiO? (15 mm × 15 mm × c.a. 1.5 µm in thickness). The use of deep UV light (? = 222 nm) as a light source was necessary to enhance photocatalytic activity, due to photo-excitation occurring in both BDD and TiO?.

SUBMITTER: Suzuki N

PROVIDER: S-EPMC6321498 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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Synthesis of Mesoporous TiO₂/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation.

Suzuki Norihiro N Okazaki Akihiro A Kuriyama Haruo H Serizawa Izumi I Hara Aiga A Hirano Yuiri Y Nakabayashi Yukihiro Y Roy Nitish N Terashima Chiaki C Nakata Kazuya K Katsumata Ken-Ichi KI Kondo Takeshi T Yuasa Makoto M Fujishima Akira A

Molecules (Basel, Switzerland) 20181127 12

There is a need for highly efficient photocatalysts, particularly for water purification. In this study, we fabricated a mesoporous TiO₂ thin film on a boron-doped diamond (BDD) layer by a surfactant-assisted sol-gel method, in which self-assembled amphiphilic surfactant micelles were used as an organic template. Scanning electron microscopy revealed uniform mesopores, approximately 20 nm in diameter, that were hexagonally packed in the TiO₂ thin film. Wide-angle X-ray diffraction and Raman spec ...[more]

PMID: 30486392

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Project description:BackgroundIn dentistry, instruments, appliances, and body fluids such as saliva or blood are possible sources of infection. Although conventional antiseptic procedures effectively prevent infection, spittoons cannot be sanitized between each treated patient and are usually washed only with running water. However, there is currently no fast and efficient disinfection method that can be implemented between treatments. An optically filtered krypton chloride excimer lamp using ultraviolet light (Far UV-C) in the 200-230 nm wavelength range (innocuous to humans) has been recently used as a virus- and bacteria-inactivating technology. This study aimed to identify the bioburden of a dental spittoon and examine the susceptibility of two oral Streptococcus and two Enterococci to 222-nm Far UV-C by irradiating the spittoon with 222 nm Far UV-C for 5 min before evaluating the disinfection effect.MethodsBacterial analysis and real-time polymerase-chain reaction testing was used to confirm the spittoon's biological contamination. Bacterial susceptibility to a 222-nm Far UV-C was determined with a graded dose irradiation test. After each treatment, the spittoon was irradiated with 222-nm Far UV-C for 5 min, and the disinfecting effect was evaluated. Microbial analysis of the spittoon's surface was performed using the Silva database.ResultsWe found that > 97% of the microbes consisted of six bacterial phyla, whereas no viruses were found. Pseudomonas aeruginosa was frequently detected. The 1-log reduction value of two oral-derived Streptococci and two Enterococci species at 222-nm Far UV-C was 4.5-7.3 mJ/cm2. Exposure of the spittoon to 222-nm Far UV-C at 3.6-13.5 mJ/cm2 significantly decreased bacterial counts (p < 0.001).ConclusionsIrradiation with 222-nm Far UV-C at 3.6-13.5 mJ/cm2 significantly eliminates bacteria in spittoons, even when they are only rinsed with water. Hence, 222-nm Far UV-C irradiation may inhibit the risk of bacterial transmission from droplets in sink surfaces.

Dataset Information

Synthesis of Mesoporous TiO?/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (? = 222 nm) Irradiation.

Publications

Synthesis of Mesoporous TiO₂/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation.

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