U VIX Corporation

Meguro-ku, Japan

U VIX Corporation

Meguro-ku, Japan
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Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | Hayashi Y.,Im PACT World Co. | Ito M.,IDEA Consultants Inc. | And 7 more authors.
Chemical Engineering Journal | Year: 2012

The novel air-cleaner with photocatalysis-plasma synergistic reactor was developed as an effective method for the separation of smoking area. The reactor consists of two essential technologies: plasma assisted catalytic technology (PACT) reactor and a TiO2 impregnated Ti-mesh filter (TMiP™). The air-cleaners were tested by the tobacco smoke deodorization tests according to both the standard test method for air cleaner and the proposed test method. In the standard test method, 80-100% decrease of the concentrations of gaseous compounds in tobacco smoke in 1m3 box has been achieved for 30min by the air-cleaner. It seems that present system which realize a better contact among the TMiP surface, the gas phase, and high-energy and reactive species generated by PACT is effective to have the benefit of plasma enhanced photocatalysis. On the other hand, more practical test method in the real-scale smoking room (2.7×3.6×2.5m) includes the analysis of a trace amount of gaseous compounds the evaluation by using a one-pass system from smoking room to non-smoking room was proposed. Almost of the compounds could be decomposed and/or removed by the practical air-cleaner with " one-pass" condition. The proposed test method would lead to establish the suitable method for the separation of smoking room. © 2012 Elsevier B.V.


Ochiai T.,Kanagawa Academy Of Science And Technology | Iizuka Y.,Kanagawa Academy Of Science And Technology | Iizuka Y.,Kanagawa University | Nakata K.,Kanagawa Academy Of Science And Technology | And 6 more authors.
Diamond and Related Materials | Year: 2011

The electrochemical decomposition of environmentally persistent perfluorooctanoic acid (PFOA) was achieved by the use of a boron-doped diamond (BDD) electrode. The PFOA decomposition follows pseudo-first-order kinetics, with an observed rate constant (k 1) of 2.4 × 10 - 2 dm 3 h - 1. Under the present reaction conditions, k 1 increased with increasing current density and saturated at values over 0.60 mA cm - 2. Therefore, the rate-limiting step for the electrochemical decomposition of PFOA was the direct electrochemical oxidation at lower current densities. In the proposed decomposition pathway, direct electrochemical oxidation cleaves the C-C bond between the C 7F 15 and COOH in PFOA and generates a C 7F 15 radical and CO 2. The C 7F 15 radical forms the thermally unstable alcohol C 7F 15OH, which undergoes F - elimination to form C 6F 13COF. This acid fluoride undergoes hydrolysis to yield another F - and the perfluorocarboxylic acid with one less CF 2 unit, C 6F 13COOH. By repeating these processes, finally, PFOA was able to be totally mineralized to CO 2 and F -. Moreover, whereas the BDD surface was easily fluorinated by the electrochemical reaction with the PFOA solution, medium pressure ultraviolet (MPUV) lamp irradiation in water was able to easily remove fluorine from the fluorinated BDD surface. © 2010 Elsevier B.V. All rights reserved.


Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | Iizuka Y.,Kanagawa Academy Of Science And Technology | Iizuka Y.,Kanagawa University | And 8 more authors.
Industrial and Engineering Chemistry Research | Year: 2011

Decomposition of environmentally persistent perfluorooctanoic acid (PFOA) in aqueous suspensions of a TiO 2 photocatalyst, with use of medium-pressure ultraviolet (MPUV) lamp irradiation alone, was examined under atmospheric pressure. Compared to direct photolysis, TiO 2 photocatalysis led to efficient PFOA decomposition and production of CO 2 and F -. PFOA decomposition followed pseudo-first-order kinetics, with observed rate constants of 1.3 × 10 -2 and 8.6 × 10 -2 dm 3 h -1 in direct photolysis and TiO 2 photocatalysis, respectively. The latter (photocatalytic) rate constant is 5-100 times greater than those obtained in other published research on the photocatalytic decomposition of PFOA. In the proposed decomposition pathway, PFOA molecules adsorb onto the TiO 2 surface according to adsorption equilibrium in an aqueous suspension and could be easily decomposed by holes and radicals generated by MPUV lamp irradiation. Under the present reaction conditions, a narrow region of TiO 2 concentrations around 1.5 wt % showed the maximum extent of PFOA decomposition, CO 2 formation, and F - formation. The optimum rate can be attributed to a trade-off between an increase of photon absorption by TiO 2 and a decrease in UV penetration below the surface of the TiO 2 suspension. In the 1.5 wt % TiO 2 photocatalyst concentration, 5 mM PFOA was almost totally decomposed during 4 h of MPUV lamp irradiation under atmospheric pressure. © 2011 American Chemical Society.


Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | Nakata K.,Kanagawa Academy Of Science And Technology | Nakata K.,Tokyo University of Science | And 6 more authors.
Electrochemistry | Year: 2011

The novel photocatalysis-plasma hybrid air-purification unit using a titanium-mesh sheet modified with TÍO2 (TMiP™) and a surface discharge-induced plasma (SPCP) was investigated. The SPCP unit generates air-plasma on wide area of its surface and TMiP sheet was successfully irradiated by air-plasma without any destruction. Significant decomposition of the ammonia gas has been achieved by the photocatalysis-plasma hybrid reactor. In the present experimental condition, the SPCP unit without TMiP and UV-lamp with TMiP was not effective on the decomposition of the ammonia gas. Therefore, synergistic effects of catalytic activation and plasma excitation on the hybrid reactor with large surface area is useful for significant oxidative decomposition of gaseous pollutants.


Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | Nanba H.,Kanagawa Academy Of Science And Technology | Nanba H.,Kanagawa University | And 15 more authors.
Catalysis Science and Technology | Year: 2012

An ozone-assisted photocatalytic water-purification unit using a TiO 2 modified titanium-mesh sheet (TMiP) was investigated. Significant decomposition of biological and chemical contaminants has been achieved by highly active intermediates formed by catalytic decomposition and photocatalysis.


Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | Masuko K.,Tokyo University of Science | Tago S.,Kanagawa Academy Of Science And Technology | And 10 more authors.
Water (Switzerland) | Year: 2013

The recent applications of a TiO2-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/O3 reactor disinfected E. coli in aqueous suspension in approximately 1min completely, and also decreased the number of E. coli in sewage water in 15min dramatically. The observed rate constants of 7.5L/min and 1.3L/min were calculated by pseudo-first-order kinetic analysis respectively. Although organic substances in sewage water were supposed to prevent the UV-C/TMiP/O3 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. © 2013 by the authors.


Slimen H.,Kanagawa Academy Of Science And Technology | Slimen H.,Gabes University | Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | And 8 more authors.
Industrial and Engineering Chemistry Research | Year: 2012

TiO 2-impregnated titanium mesh filter (TMiP) elaborated by electrochemical anodization of the titanium mesh, followed by dip coating into TiO 2 anatase solution, was used for the removal of cigarette smoke as a principal indoor air pollutant. The TMiP catalyst revealed high activity for the removal of ammonium, nicotine, 3-ethenylpyridine, and tar, which constitute some of the volatile and nonvolatile compounds of cigarette smoke. As a practical application, an air purifier has been developed and tested for the removal of cigarette smoke. © 2011 American Chemical Society.


Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | Hoshi T.,Kanagawa Academy Of Science And Technology | Hoshi T.,Kanagawa University | And 13 more authors.
Catalysis Science and Technology | Year: 2011

A novel photocatalytic filter, titanium-mesh sheet modified with TiO 2 (TMiP), was fabricated and applied for environmental purification. The high flexibility of TMiP allows for an easy to design and fabricate photocatalytic reactor. Moreover, TMiP provides an excellent air or water pass-through while maintaining a high level of surface contact with UV irradiation. © 2011 The Royal Society of Chemistry.


Ochiai T.,Kanagawa Academy Of Science And Technology | Ochiai T.,Tokyo University of Science | Nakata K.,Kanagawa Academy Of Science And Technology | Nakata K.,Tokyo University of Science | And 6 more authors.
Nanoscience and Nanotechnology Letters | Year: 2012

Anodizing process could improve the air purification ability of TiO 2-sintered Ti-mesh filter. The surface morphology of Ti-mesh could be controlled by anodizing with suitable applying voltage. Ti-mesh which heated after anodizing at 70 V or 90 V shows purple or green color, respectively. It suggests that the presence of a specific thickness of the TiO 2 layer (about several hundred nm) fabricated by anodizing process. Moreover, Ti-mesh samples that heated after anodizing at 70 V and 90 V show rough surface. The TiO 2 particles were successfully sintered on these rough surfaces with the particle sizes of about 0.1 μm. However, TiO 2-sintered Ti-mesh sample without anodizing shows no interference color and highly aggregated TiO 2 particles on the surface. The air purification activity of these Ti-mesh filters corresponded to its surface morphology. Therefore, anodizing process could strongly affect to not only surface morphology of Ti-mesh filter, but also its air purification efficiency. These results would be attractive to develop more effective photocatalytic air purification filter. © 2012 American Scientific Publishers.


Patent
U Vix Corporation | Date: 2015-01-30

An air purification system includes an internally hollow cylindrical casing made of a non-conducting material; an inner electrode arranged on an inner surface of the supporting member; an outer electrode arranged on an outer surface of the supporting member; a photocatalyst filter arranged on an outer surface of the outer electrode for purifying air inside a plasma generation zone; and a power source for supplying power of opposite polarities to each of the inner electrode and the outer electrode so as to generate plasma. The photocatalyst filter includes a filter element, and the filter element includes a porous titanium foil having a non-periodic spongy structure impregnated with anatase titanium dioxide particles as a photocatalyst.

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