Photocatalytic material and photocatalytic member and purification device using the photocatalytic material

• US 8,367,050 B2
• Filed: 04/18/2008
• Issued: 02/05/2013
• Est. Priority Date: 04/18/2007
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Taniguchi, Noboru, Kuroha, Tomohiro, Tokumitsu, Shuzo, Tokuhiro, Kenichi
• Primary Examiner(s): Warden, Jill
• Assistant Examiner(s): CHORBAJI, MONZER R
• Application Number:
  US12/596,350
• Publication Number:
  US 20100135864A1
• Time in Patent Office: 1,754 Days
• Field of Search: 422/5, 422/24, 422/186.3, 422/306, 422/184.04, 424/76.2, 424/76.8, 424/52, 962/24, 96/55, 252/62.3, 252/600, 524/80, 524/497, 428/323, 428/329, 502/150, 502/171
• US Class Current: 424/76.2
• CPC Class Codes: A61L 9/18 Radiation A61L9/22 takes precedence
• CPC Class Codes: A61L 9/205 using a photocatalyst or photosensitiser
• CPC Class Codes: B01D 2255/20707 Titanium
• CPC Class Codes: B01D 2255/504 ZSM 5 zeolites
• CPC Class Codes: B01D 2255/802 Photocatalytic
• CPC Class Codes: B01D 2255/90 Physical characteristics of catalysts
• CPC Class Codes: B01D 2257/70 Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
• CPC Class Codes: B01D 2257/90 Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
• CPC Class Codes: B01D 2259/4558 for being employed as mobile cleaners for ambient air, i.e. the earth's atmosphere
• CPC Class Codes: B01D 2259/804 UV light
• CPC Class Codes: B01D 53/8668 Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
• CPC Class Codes: B01D 53/885 Devices in general for catalytic purification of waste gases
• CPC Class Codes: B01J 27/135 with titanium, zirconium, hafnium, germanium, tin or lead
• CPC Class Codes: B01J 29/06 Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
• CPC Class Codes: B01J 29/18 of the mordenite type
• CPC Class Codes: B01J 29/40 of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/0246 Coatings comprising a zeolite
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide

Abstract

Provided are a photocatalytic material that improves a decomposition performance and a decomposition rate, as well as a photocatalytic member and a purification device in which the photocatalytic material is used. The photocatalytic member is a photocatalytic member (1) that includes a substrate (10) and a photocatalyst layer (11) formed on a surface of the substrate (10), wherein the photocatalyst layer (11) contains a titanium oxide photocatalyst and zeolite, the titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine, in which a content of the fluorine in the titanium oxide photocatalyst is 2.5 wt % to 3.5 wt %, and 90 wt % or more of the fluorine is chemically bonded to the anatase-type titanium oxide.

Claims

1. A photocatalytic material consisting essentially of a titanium oxide photocatalyst and zeolite, the titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine,

wherein a content of the fluorine in the titanium oxide photocatalyst is 2.5 wt % to 3.5 wt %,

wt % or more of the fluorine is bonded chemically to the anatase-type titanium oxide, and

when a content of sodium in the titanium oxide photocatalyst is assumed to be A wt % and a content of the fluorine in the titanium oxide photocatalyst is assumed to B wt %, a ratio A/B is 0.01 or less.

2. The photocatalytic material according to claim 1, wherein the zeolite contains at least one of a mordenite-form zeolite and a ZSM-5-form zeolite.

3. The photocatalytic material according to claim 1,

wherein the zeolite contains silica and alumina, and

a molar component ratio between the silica and the alumina (silica/alumina) in the zeolite is 240 or more.

4. The photocatalytic material according to claim 1, wherein 100 wt % of the fluorine is bonded chemically to the anatase-type titanium oxide.

5. The photocatalytic material according to claim 1, wherein the chemical bonding is ionic bonding.

6. The photocatalytic material according to claim 1, wherein at least a part of the fluorine chemically bonded to the anatase-type titanium oxide is located on a surface of the anatase-type titanium oxide.

7. The photocatalytic material according to claim 1, wherein a content of the zeolite in the photocatalytic material is 10 wt % or more.

8. A photocatalytic member comprising a substrate and photocatalyst layer formed on a surface of the substrate,

wherein the photocatalyst layer contains the photocatalytic material according to claim 1.

9. The photocatalytic member according to claim 8, wherein the substrate is a substrate having air permeability.

10. A purification device comprising:

the photocatalytic member according to claim 8; and

a light source that irradiates the photocatalytic member with light having a wavelength of 400 nm or less.

11. The purification device according to claim 10, further comprising blowing means that introduces a gas containing organic substances toward the photocatalytic member.