Development of an Air-Purification Unit Using a Photocatalysis-Plasma Hybrid Reactor

Ochiai, Tsuyoshi; Nakata, Kohei; Murakami, Taketoshi; Morito, Yuko; Hosokawa, Shunsuke; Fujishima, Akira

doi:10.5796/electrochemistry.79.838

Cited by 24 publications

(12 citation statements)

References 15 publications

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“…3). 8,[10][11][12][13][14][15][16] Among them, the author proposes a practical air-cleaner using photocatalysis-plasma synergistic reactor in the next section. Electrochemistry, 82(9), 720-725 (2014) described previously.…”

Section: Fabrication and Application Of Tio 2 -Coated Ti-mesh As An Ementioning

confidence: 99%

Environmental and Medical Applications of TiO2 Photocatalysts and Boron-doped Diamond Electrodes

Ochiai

2014

Electrochemistry

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This paper summarized the author's recent studies about effective design of the systems for environmental and dental application of TiO 2 photocatalysts and boron-doped diamond (BDD) electrodes. The titanium mesh impregnated photocatalyst, TMiP™ has been fabricated as a novel photocatalytic filter. The high mechanical flexibility of TMiP allows us to design any geometry of modules by combination of UV-sources and the other technologies. In this paper, a practical air-cleaner using the TMiP-plasma synergistic reactor was fabricated and installed in a real-scale smoking room in the office. The amounts of the compounds in tobacco smoke were almost totally removed by the air-cleaner. On the other hands, the author also reported the possibilities of wastewater treatments by electrolysis with BDD electrodes. Based on these studies, a novel pinpoint ozone-water production unit for dental treatment using of BDD microelectrodes was developed. The unit showed almost the same sterilization ability as conventional 20 ppm of aqueous sodium hypochlorite treatment in in vitro assessment in the root-canal of bovine teeth. These results present several key solutions for practical applications of TiO 2 photocatalysis and BDD electrolysis.

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Section: Fabrication and Application Of Tio 2 -Coated Ti-mesh As An Ementioning

confidence: 99%

Environmental and Medical Applications of TiO2 Photocatalysts and Boron-doped Diamond Electrodes

Ochiai

2014

Electrochemistry

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“…(Shen andKu 1999: Chen et al 2006). Earlier attempts combining NTP with a TiO 2 photocatalyst to abate VOCs indicated the contribution of photocatalysis induced by UV light from the plasma (Kang et al 2002;Kim et al 2005b;Subrahmanyam et al 2007;Huang and Li 2011;Ochiai et al 2011). Interestingly, Ogata et al observed an improved efficiency of a photoinactive TiO 2 -rutile catalyst during the destruction of chlorofluorocarbons, which they attributed to the surface oxygen atoms .…”

Section: Introductionmentioning

confidence: 99%

Catalytic nonthermal plasma reactor for the abatement of low concentrations of benzene

Karuppiah

Reddy

et al. 2013

Int. J. Environ. Sci. Technol.

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Oxidative decomposition of dilute benzene in air was carried out in a dielectric barrier discharge reactor with inner metal fiber electrode that was later modified with transition metal oxides. Typical results indicated the best performance of the designed reactor for the removal of dilute benzene, where conventional techniques may not be efficient. The introduction of transition metal oxides in the discharge zone increased the conversion of benzene and shifted the product distribution to total oxidation. The performance of the reactor was further improved on humidification of air stream. The better performance of MnO x /SMF over CoO x and SMF may be due to in situ decomposition of ozone that may lead to the formation of strong oxidant atomic oxygen, whereas the best performance with TiO 2 /MnO x /SMF may be assigned due to the synergy between ozone decomposition on MnO x surface and photocatalytic action on TiO 2 .

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“…Highly oxidative intermediates such as atomic oxygen could be produced from O 3 by UV-C irradiation and/or the presence of heterogeneous catalyst surfaces. In this case, UV-C irradiation and the large specific surface area of TMiP could decompose O 3 effectively [11]. Figure 8 shows the time course of SS and PtCo Color of the sewage water samples in the water-purification systems.…”

Section: Water-purification Ability Of the Reactors Using The Higher mentioning

confidence: 99%

“…Due to the highly-ordered three-dimensional structure modified with TiO 2 nanoparticles, TMiP provides excellent breathability for both air and water while maintaining a high level of surface contact. Its high flexibility and mechanical stability allow the design of any shape for the unit and for use in relatively severe situations such as inner plasma [11,15]. Based on these results, we summarize in this paper the applications of TMiP for water purification with newly collected data including biological assay and sewage water treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, although many researchers have been working on photocatalytic water purification, it could not be developed to the stage of effective real industrial technology because of the difficulty in fabricating a practical water purifier. Recently we have developed an easy-to-handle photocatalytic filter material, TiO 2 nanoparticles modified titanium mesh (Titanium mesh impregnated photocatalyst, TMiP™), and its applications for environmental purification [4,[10][11][12][13][14][15][16]. Due to the highly-ordered three-dimensional structure modified with TiO 2 nanoparticles, TMiP provides excellent breathability for both air and water while maintaining a high level of surface contact.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

Ochiai

Masuko

Tago

et al. 2013

Water

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Abstract:The recent applications of a TiO 2 -modified Ti-mesh filter (TMiP™) for water purification are summarized with newly collected data including biological assays as well as sewage water treatment. The water purification reactors consist of the combination of a TMiP, a UV lamp, an excimer VUV lamp, and an ozonation unit. The water purification abilities of the reactor were evaluated by decomposition of organic contaminants, inactivation of waterborne pathogens, and treatment efficiency for sewage water. The UV-C/TMiP/O 3 reactor disinfected E. coli in aqueous suspension in approximately 1 min completely, and also decreased the number of E. coli in sewage water in 15 min OPEN ACCESSWater 2013, 5 1102 dramatically. The observed rate constants of 7.5 L/min and 1.3 L/min were calculated by pseudo-first-order kinetic analysis respectively. Although organic substances in sewage water were supposed to prevent the UV-C/TMiP/O 3 reactor from purifying water, the reactor reduced E. coli in sewage water continuously. On the other hand, although much higher efficiencies for decomposition of organic pollutants in water were achieved in the excimer/TMiP reactor, the disinfection activity of the reactor for waterborne pathogens was not as effective as the other reactors. The difference of efficiency between organic pollutants and waterborne pathogens in the excimer/TMiP reactor may be due to the size, the structure, and the decomposition mechanism of the organic pollutants and waterborne pathogens. These results show that a suitable system assisted by synergy of photocatalysts and other technologies such as ozonation has a huge potential as a practical wastewater purification system.

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Development of an Air-Purification Unit Using a Photocatalysis-Plasma Hybrid Reactor

Cited by 24 publications

References 15 publications

Environmental and Medical Applications of TiO2 Photocatalysts and Boron-doped Diamond Electrodes

Environmental and Medical Applications of TiO2 Photocatalysts and Boron-doped Diamond Electrodes

Catalytic nonthermal plasma reactor for the abatement of low concentrations of benzene

Synergistic Water-Treatment Reactors Using a TiO2-Modified Ti-Mesh Filter

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