Photocatalyst for air purification, and ceramic catalyst filter and air purification device including the same

Patent metadata

Field	Value
Publication number	US-12064536-B2
Application number	US-202117379871-A
Country	US
Kind code	B2
Filing date	Jul 19, 2021
Priority date	Mar 8, 2021
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A photocatalyst for air purification, a photocatalyst film including the photocatalyst, and an air purification device including the photocatalyst. The photocatalyst for air purification includes: a first metal oxide particle having ultraviolet absorptivity, and fluorine bound to a surface of the first metal oxide particle; second metal oxide particles present on the surface of the first metal oxide particle. The use of the photocatalyst for air purification to remove or degrade volatile organic compounds (VOCs) and viruses.

First claim

What is claimed is:

1. A photocatalyst for air purification, comprising:
a first metal oxide particle having ultraviolet absorptivity, and fluorine bound to a surface of the first metal oxide particle; and
second metal oxide particles present on the surface of the first metal oxide particle.

2. The photocatalyst for air purification of claim 1 , wherein the fluorine bound to the surface of the first metal oxide particle is present in a region other than a region in which the second metal oxide particles are present, and the fluorine is not present at an interface between the first metal oxide particle and the second metal oxide particles.

3. The photocatalyst for air purification of claim 1 , wherein the first metal oxide particle includes a metal oxide of titanium (Ti), zinc (Zn), zirconium (Zr), tantalum (Ta), niobium (Nb), tungsten (W), or an alloy of metal oxides thereof.

4. The photocatalyst of claim 1 , wherein the first metal oxide particle includes titanium oxide.

5. The photocatalyst of claim 1 , wherein the first metal oxide particle has a specific surface area of about 20 square meters per gram to about 300 square meters per gram.

6. The photocatalyst of claim 1 , wherein the first metal oxide particle is primary particle, or is a secondary particle in which primary particles are aggregated or bonded to another first metal oxide particle.

7. The photocatalyst of claim 1 , wherein the second metal oxide particles further comprise at least one second metal oxides of copper (Cu), platinum (Pt), gold (Au), silver (Ag), zinc (Zn), palladium (Pd), or an alloy of metal oxides thereof, and the at least one second metal oxide particle is different from the first metal oxide particle.

8. The photocatalyst of claim 1 , wherein the second metal oxide particles further comprise copper(I) oxide.

9. The photocatalyst of claim 1 , wherein a content of the second metal oxide particles is about 0.1 parts by weight to about 5 parts by weight based on 100 parts by weight of the first metal oxide particle.

10. The photocatalyst of claim 1 , wherein at least a majority of first metal oxide particles, and a majority of second metal oxide particles, independently have a spherical shape, a tubular shape, a rod shape, a fiber shape, a sheet shape, a conical shape, a pyramidal shape, a toroidal shape, or any shape combination thereof.

11. The photocatalyst of claim 1 , wherein the first metal oxide particle is a microscale primary particle or a microscale secondary particle, the second metal oxide particle is a nanometer-scale primary particle, and the surface of the first metal oxide particle is surrounded by the second metal oxide particles.

12. The photocatalyst of claim 1 , wherein the photocatalyst photo-catalyzes in an ultraviolet wavelength range.

13. The photocatalyst of claim 1 , wherein the fluorine is bonded to the surface of the first metal oxide particle.

14. A photocatalyst film comprising the photocatalyst of claim 1 .

15. An air purification device comprising the photocatalyst of claim 1 .

16. A ceramic catalyst filter comprising:
a monolithic structure having a first surface that blocks a first material and that provides transmission of a second material, and a second surface from which the second material is removed,
wherein the second surface of the monolithic structure comprises a catalyst layer including the photocatalyst of claim 1 for removing the second material upon exposure of the photocatalyst to ultraviolet light.

17. A method of preparing the photocatalyst of claim 1 , the method comprising:
conducting a first heat treatment of a mixture including a precursor of a first metal oxide particle having ultraviolet absorptivity, and a precursor of second metal oxide particles, to obtain a first product;
adding glucose and sodium hydroxide to the first product and conducting a second heat treatment to obtain a second product; and
fluorinating a surface of the second product.

18. The method of claim 17 , wherein a content of the precursor of the second metal oxide particles is about 0.1 parts by weight to about 5 parts by weight based on 100 parts by weight of the first metal oxide particle.

19. The method of claim 17 , wherein the adding of the glucose and the sodium hydroxide comprises adding about 2 moles to about 6 moles of the glucose and about 2 moles to about 16 moles of the sodium hydroxide, based on 1 mole of copper of the first product.

20. The method of claim 17 , wherein the fluorinating of the surface of the second product comprises an addition of sodium fluoride (NaF).

Assignees

• Samsung Electronics Co Ltd

Inventors

• Koo Minseok
• Kwon Hyukjae
• Lee Hyun Chul
• Kuk Sukeun
• Yang Dongsik
• Oh Sehyeong
• Ji Sangmin

Classifications

• B01D2255/802

  Photocatalytic · CPC title

• B01J35/39 Primary

  Photocatalytic properties · CPC title

• C01G23/053

  Producing by wet processes, e.g. hydrolysing titanium salts · CPC title

• B01D2258/06

  Polluted air · CPC title

• B01D2201/18

  Filters characterised by the openings or pores · CPC title