Titanium oxide aerogel particle, photocatalyst forming composition, and photocatalyst

Patent metadata

Field	Value
Publication number	US-10538434-B2
Application number	US-201815988439-A
Country	US
Kind code	B2
Filing date	May 24, 2018
Priority date	Sep 8, 2017
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

A titanium oxide aerogel particle includes a metallic compound that has a metal atom and a hydrocarbon group, the metallic compound being bonded to a surface of the aerogel particle via an oxygen atom. The titanium oxide aerogel particle has a BET specific surface area of 120 m2/g to 1000 m2/g, and has absorption at wavelengths of 450 nm and 750 nm.

First claim

What is claimed is:

1. A titanium oxide aerogel particle comprising:
a titanium oxide aerogel particle, and
a metallic compound that has a metal atom and a hydrocarbon group, the metallic compound being bonded to a surface of the titanium oxide aerogel particle via an oxygen atom,
wherein:
the titanium oxide aerogel particle has a BET specific surface area of 120 m 2 /g to 1000 m 2 /g, and has absorption at wavelengths of 450 nm and 750 nm, and
an element ratio C/Ti of carbon C to titanium Ti on the surface is in a range of 0.3 to 1.5.

2. The titanium oxide aerogel particle according to claim 1 ,
wherein the titanium oxide aerogel particle satisfies the following expression,
0.01≤ A≤ 0.3,

wherein A represents a reduction amount of the element ratio C/Ti when the titanium oxide aerogel particle is irradiated with ultraviolet rays having a wavelength of 352 nm, at an irradiation intensity of 1.3 mW/cm 2 for 20 hours.

3. The titanium oxide aerogel particle according to claim 1 ,
wherein the titanium oxide aerogel particle has absorption at wavelengths in the entire range of 400 nm to 800 nm.

4. The titanium oxide aerogel particle according to claim 1 ,
wherein the hydrocarbon group of the metallic compound is directly bonded to the metal atom.

5. The titanium oxide aerogel particle according to claim 1 ,
wherein the metal atom is a silicon atom.

6. The titanium oxide aerogel particle according to claim 1 ,
wherein the hydrocarbon group is a saturated or unsaturated aliphatic hydrocarbon group having 1 to 20 carbon atoms, or an aromatic hydrocarbon group having 6 to 20 carbon atoms.

7. The titanium oxide aerogel particle according to claim 6 ,
wherein the hydrocarbon group is the saturated aliphatic hydrocarbon group having 1 to 20 carbon atoms.

8. The titanium oxide aerogel particle according to claim 7 ,
wherein the hydrocarbon group is the saturated aliphatic hydrocarbon group having 4 to 10 carbon atoms.

9. The titanium oxide aerogel particle according to claim 1 ,
wherein the titanium oxide aerogel particle has a volume average particle diameter of 0.1 μm to 3 μm, and a volume particle size distribution of 1.5 to 10.

10. The titanium oxide aerogel particle according to claim 1 ,
wherein the titanium oxide aerogel particle is an aggregated particle in which primary particles are aggregated, and an average diameter of the primary particles is 1 nm to 120 nm.

11. The titanium oxide aerogel particle according to claim 1 , wherein the BET specific surface area of the titanium oxide aerogel particle is 150 m 2 /g to 900 m 2 /g.

12. A photocatalyst forming composition comprising the titanium oxide aerogel particle according to claim 1 ; and at least one compound selected from the group consisting of a dispersion medium and a binder.

13. A photocatalyst comprising the titanium oxide aerogel particle according to claim 1 .

Assignees

• Fuji Xerox Co Ltd

Inventors

• Takeuchi Sakae
• Okuno Hiroyoshi
• Yoshikawa Hideaki
• Kadokura Yasuo
• Kashima Yasunobu
• Iwanaga Takeshi
• Nozaki Shunsuke
• Zenitani Yuka

Classifications

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• B01J31/38

  of titanium, zirconium or hafnium · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01G23/08 Primary

  Drying; Calcining {; After treatment of titanium oxide} · CPC title