Remote Bactericidal Effect of Anatase TiO&lt;sub&gt;2&lt;/sub&gt; Photocatalytic Nanoparticles Annealed with Low-Temperature O&lt;sub&gt;2&lt;/sub&gt; Plasma

Kawakami, Retsuo; Takao, Yuki; Shirai, Atsushi; Mukai, Takashi

doi:10.4265/bio.27.217

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Kawakami, R. et al prepared anatase-type TiO2 photocatalysts using low-temperature O-2 plasma combined with TiO photocatalysts and analyzed the data for the catalysts. The results showed that the photocatalyst was able to achieve a long-range sterilization effect in humidified gas streams, which promotes the application field of low-temperature plasma technology [19]. Ilhom, S. et al analyzed the growth of low-temperature plasma technology on silicon, sapphire, and crystalline thin films on glass and used the data for experimental analysis, which showed that the growth period of low-temperature plasma thin films cycled between 0.69 and 1.31 [20].…”

Section: ) Low-temperature Plasma Technologymentioning

confidence: 93%

Design of self-cleaning low-temperature plasma fume cleaning device based on computational fluid dynamics

Liu

2023

Applied Mathematics and Nonlinear Sciences

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With the rapid development of the catering industry, catering fume pollution has become one of the important sources of urban air pollution. How to realize the purification of catering fumes is a huge problem related to public life health and safety. This paper first constructs the structure of self-cleaning low-temperature plasma soot purification and provides the equipment, materials, and process required for soot purification experiments. Secondly, CFD simulation of the flue of the oil smoke purification device is introduced into Computational Fluid Dynamics, and the relevant physical parameters of the oil smoke flow are obtained by solving the equations of mass conservation, momentum conservation and energy conservation. The self-cleaning low-temperature plasma oil smoke purification device was also analyzed by numerical simulation using Fluent software, and the method for detecting VOCs in restaurant oil smoke was given. Lastly, the oil smoke purification device constructed in this paper was tested for its impact on oil smoke. The results show that for every 100W·m−2 increase in the intensity of oil smoke, the temperature error will increase by about 0.01℃ accordingly, and when the intensity of oil smoke reaches 500W·m−2, the temperature error of the oil smoke purification device is 0.074℃. The highest imported concentration of all kinds of VOCs in the barbecue smoke produced by the experiment reached 3762.53 μg / m 3, and the average treatment efficiency of 98.69% was achieved under the actual air volume of about 800m3/h. This shows that the use of computational fluid dynamics can realize the simulation analysis of a self-cleaning low-temperature plasma fume purification device, and the fume purification device has a strong fume purification ability.

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Section: ) Low-temperature Plasma Technologymentioning

confidence: 93%

Design of self-cleaning low-temperature plasma fume cleaning device based on computational fluid dynamics

Liu

2023

Applied Mathematics and Nonlinear Sciences

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Enhanced Photocatalytic Activity of Anatase/Rutile‐Mixed Phase Titanium Dioxide Nanoparticles Annealed with Polyethylene Glycol at Low Temperatures in Aluminum Foil‐Covered Combustion Boats

Kawakami,

Matsumoto,

Yanagiya

et al. 2024

Physica Status Solidi (a)

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A facile carbon‐doping process is proposed to enhance the photocatalytic activity of anatase/rutile‐mixed phase TiO2 nanoparticles using polyethylene glycol (PEG). The TiO2‐PEG composite is loaded into a boat and covered tightly with Al foil to increase the pressure inside that boat during annealing. The boat is annealed for 1 h at different temperatures and PEG ratios. The annealing with 30% PEG at 300 °C enhances the decomposition of organic pollutants and bacterial inactivation under 405 nm light compared to the annealing without Al films. This annealing causes 2.5–3% carbon doping, introduces more oxygen vacancies, and converts PEG into organic compounds rich in CC bond components. These modifications of TiO2 can be attributed to carbon‐centered radicals produced from PEG during annealing. The modifications change the band structure to enhance the photogenerated carrier concentration responsible for the photocatalytic activity. The carbon doping narrows the anatase and rutile bandgaps, allowing the anatase phase to absorb 405 nm light. The introduced oxygen vacancies increase the electron‐trapping sites and raise the adsorbed oxygen groups enhancing the upward band bending and the depletion layer depth at the surface. The PEG‐converted compounds can transfer photogenerated electrons within the compounds to the TiO2 conduction band.

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Plasma-assisted annealing of Pt-doped rutile TiO2 nanoparticles for enhanced decomposition and bacterial inactivation under general lighting

Kawakami,

Makino,

Yanagiya

et al. 2024

Journal of Vacuum Science &Amp; Technology B

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Enhanced photocatalytic activity of rutile-based TiO2 materials under general lighting is practically desired. O2 plasma-assisted annealing (PAA) effects on Pt-doped rutile TiO2 nanoparticles were clarified along with its visible-light-driven photocatalytic activity enhancement. The PAA-treated samples were mainly analyzed using optical spectroscopy and x-ray photoelectron spectroscopy (XPS). The photocatalytic activity was assessed by decomposing methylene blue dye and inactivating Bacillus subtilis under general lighting. The PAA treatment changed the O 1s, Ti 2p, and Pt 4f spectra of XPS from those of the pristine sample. This change indicated that the PAA treatment introduced more oxygen deficiency or oxygen vacancies and more oxygen groups adsorbed on the surface. The introduced oxygen vacancies and adsorbed oxygen groups would change the band structure, which primarily narrowed the bandgap energy or broadened the valence band edge, increased the number of electron-trapping sites from the shallow to midgap levels, and enhanced the upward band-bending at the surface. The PAA-induced change in the band structure enhanced the decomposition and bacterial inactivation because it facilitated the separation and concentration of photoexcited carriers. The findings provide a new perspective on enhancing the photocatalytic activities of rutile-based TiO2 nanoparticles under general lighting.

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Remote Bactericidal Effect of Anatase TiO<sub>2</sub> Photocatalytic Nanoparticles Annealed with Low-Temperature O<sub>2</sub> Plasma

Cited by 4 publications

References 30 publications

Design of self-cleaning low-temperature plasma fume cleaning device based on computational fluid dynamics

Design of self-cleaning low-temperature plasma fume cleaning device based on computational fluid dynamics

Enhanced Photocatalytic Activity of Anatase/Rutile‐Mixed Phase Titanium Dioxide Nanoparticles Annealed with Polyethylene Glycol at Low Temperatures in Aluminum Foil‐Covered Combustion Boats

Plasma-assisted annealing of Pt-doped rutile TiO2 nanoparticles for enhanced decomposition and bacterial inactivation under general lighting

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