Development of an O<sub>3</sub>-assisted photocatalytic water-purification unit by using a TiO<sub>2</sub>modified titanium mesh filter

Ochiai, Tsuyoshi; Nanba, Hayato; Nakagawa, Touko; Masuko, Ken; Nakata, Kohei; Murakami, Taketoshi; Nakano, Ryuichi; Hara, Masayuki; Koide, Yoshihiro; Suzuki, Tomonori; Ikekita, Masahiko; Morito, Yuko; Fujishima, Akira

doi:10.1039/c1cy00315a

Cited by 25 publications

(22 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, because of the high level and broad-spectrum biocide efficacy of photocatalysis, it is considered a valuable biocide method for use in various areas, e.g., sewage disposal treatment systems and air purification systems [54].…”

Section: Discussionmentioning

confidence: 99%

Broad Spectrum Microbicidal Activity of Photocatalysis by TiO2

et al. 2013

Self Cite

View full text Add to dashboard Cite

Photocatalytically active titanium dioxide (TiO 2 ) is widely used as a self-cleaning and self-disinfecting material in many applications to keep environments biologically clean. Several studies on the inactivation of bacteria and viruses by photocatalytic reactions have also been reported; however, only few studies evaluated the spectrum of the microbicidal activity with photocatalysis for various species. There is a need to confirm the expected OPEN ACCESSCatalysts 2013, 3 311 effectiveness of disinfection by photocatalysis against multidrug-resistant bacteria and viruses. In this study, microbicidal activity of photocatalysis was evaluated by comparing the inactivation of various species of bacteria and viruses when their suspensions were dropped on the surface of TiO 2 -coated glass. Gram-positive bacteria, e.g., methicillin-resistant Staphylococcus aureus, vancomycin-resistant Enterococcus faecalis, and penicillin-resistant Streptococcus pneumoniae, were easily inactivated by photocatalysis, whereas some gram-negative bacteria, e.g., Escherichia coli and multidrug-resistant Pseudomonas aeruginosa, were gradually inactivated by photocatalysis. Influenza virus, an enveloped virus, was significantly inactivated by photocatalysis compared with feline calicivirus, a non-enveloped virus. The effectiveness of microbicidal activity by photocatalysis may depend on the surface structure. However, they are effectively inactivated by photocatalysis on the surface of TiO 2 -coated glass. Our data emphasize that effective cleaning and disinfection by photocatalysis in nosocomial settings prevents pathogen transmission.

show abstract

Section: Discussionmentioning

confidence: 99%

Broad Spectrum Microbicidal Activity of Photocatalysis by TiO2

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…Similarly, 1 L of an aqueous suspension of E. coli was used as the biologically contaminated water sample and was circulated through the reactor by the pump at a flow rate of 1 L/min. The viability of waterborne pathogens in the artificially contaminated water samples was analyzed with previously reported methods [14,[18][19][20][21]. In this paper, a sewage water purification test was introduced as an experiment for practical use.…”

Section: Test Methods For Evaluation Of the Water Purification Abilitymentioning

confidence: 99%

“…L. pneumophila and FCV were obtained from American Type Culture Collection (Manassas, VA, USA). E. coli, L. pneumophila, and Qβ were propagated and assayed by previously described methods [14,[18][19][20]. FCV was propagated and assayed by the plaque technique on confluent layers of Crandell-Reese feline kidney cell cultures grown in 12-well culture plates as described elsewhere [21].…”

Section: General Methodsmentioning

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%

See 1 more Smart Citation

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

Ochiai

Masuko

Tago

et al. 2013

Water

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Development of an O₃-assisted photocatalytic water-purification unit by using a TiO₂modified titanium mesh filter

Cited by 25 publications

References 16 publications

Broad Spectrum Microbicidal Activity of Photocatalysis by TiO2

Broad Spectrum Microbicidal Activity of Photocatalysis by TiO2

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

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

Contact Info

Product

Resources

About

Development of an O3-assisted photocatalytic water-purification unit by using a TiO2modified titanium mesh filter

Cited by 25 publications

References 16 publications

Broad Spectrum Microbicidal Activity of Photocatalysis by TiO2

Broad Spectrum Microbicidal Activity of Photocatalysis by TiO2

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

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

Contact Info

Product

Resources

About

Development of an O₃-assisted photocatalytic water-purification unit by using a TiO₂modified titanium mesh filter