Titanium oxide photocatalyst and method for producing the same

• US 8,518,848 B2
• Filed: 02/29/2012
• Issued: 08/27/2013
• Est. Priority Date: 04/18/2007
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation), Sakai Chemical Industry Company Limited
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation), Sakai Chemical Industry Company Limited
• Inventors: Taniguchi, Noboru, Tokumitsu, Shuzo, Kuroha, Tomohiro, Tokuhiro, Kenichi, Nakashima, Akio, Kobayashi, Keita, Nakahara, Shinji
• Primary Examiner(s): Hailey, Patricia L
• Application Number:
  US13/408,770
• Publication Number:
  US 20120157300A1
• Time in Patent Office: 545 Days
• Field of Search: 502/224, 502/350, 423/610
• US Class Current: 502/224
• CPC Class Codes: A61L 9/18 Radiation A61L9/22 takes precedence
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 27/135 with titanium, zirconium, hafnium, germanium, tin or lead
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 35/615 100-500 m2/g
• CPC Class Codes: B01J 37/26 Fluorinating
• CPC Class Codes: C01G 23/00 Compounds of titanium preparation of Ti-compounds from ores or scraps C22B34/12
• CPC Class Codes: C01G 23/047 Titanium dioxide
• CPC Class Codes: C01P 2002/54 one element only
• CPC Class Codes: C01P 2006/12 Surface area

Abstract

A titanium oxide photocatalyst that is capable of improving a decomposition rate, and a method for producing the same are provided. The titanium oxide photocatalyst of the present invention is a titanium oxide photocatalyst containing at least an anatase-type titanium oxide and fluorine, wherein a content of the fluorine 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 titanium oxide photocatalyst comprising at least an anatase-type titanium oxide and fluorine,

wherein a content of the fluorine is 2.5 wt % to 3.5 wt %, and

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

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

3. The titanium oxide photocatalyst according to claim 2, wherein the chemical bond is an ionic bond.

4. The titanium oxide photocatalyst according to claim 3, 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.

5. The titanium oxide photocatalyst according to claim 2, 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.

6. The titanium oxide photocatalyst according to claim 2, wherein, when a content of sodium in the titanium oxide photocatalyst is assumed to be A wt % and a content of the fluorine therein is assumed to be B wt %, a ratio A/B is 0.001 or less.

7. The titanium oxide photocatalyst according to claim 3, wherein, when a content of sodium in the titanium oxide photocatalyst is assumed to be A wt % and a content of the fluorine therein is assumed to be B wt %, a ratio A/B is 0.01 or less.

8. The titanium oxide photocatalyst according to claim 1, wherein the chemical bond is an ionic bond.

9. The titanium oxide photocatalyst according to claim 8, 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.

10. The titanium oxide photocatalyst according to claim 8, wherein, when a content of sodium in the titanium oxide photocatalyst is assumed to be A wt % and a content of the fluorine therein is assumed to be B wt %, a ratio A/B is 0.01 or less.

11. The titanium oxide photocatalyst according to claim 1, wherein at least a part of the fluorine chemical bonded to the anatase-type titanium oxide is located on a surface of the anatase-type titanium oxide.

12. The titanium oxide photocatalyst according to claim 1, wherein, when a content of sodium in the titanium oxide photocatalyst is assumed to be A wt % and a content of the fluorine therein is assumed to be B wt %, a ratio A/B is 0.001 or less.

13. The titanium oxide photocatalyst according to claim 1, having a specific surface area of 200 m²/g to 350 m²/g.