Visible light-activated photocatalytic coating composition and air purification filter

Patent metadata

Field	Value
Publication number	US-10449519-B2
Application number	US-201615553773-A
Country	US
Kind code	B2
Filing date	Feb 23, 2016
Priority date	Feb 26, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

Disclosed is a visible light-activated photocatalytic coating composition comprising a visible light active photocatalytic material and an aqueous solvent.

First claim

The invention claimed is:

1. An air purification filter comprising:
a porous substrate comprising activated carbon, wherein
an amount of the activated carbon ranges from 20% to 80% by weight based on an amount of the porous substrate, and
the porous substrate is formed by attaching the activated carbon to or impregnating the activated carbon into a material comprising a woven or nonwoven fabric made of an organic fiber or an inorganic fiber; and

a photocatalytic coating layer coated on the porous substrate and the activated carbon, wherein the photocatalytic coating layer is coated on the porous substrate and the activated carbon by immersing the porous substrate and the activated carbon in a visible light-activated photocatalytic coating composition, and the visible light-activated photocatalytic coating composition comprises:
a visible light active photocatalytic material, wherein the visible light active photocatalytic material consists of:
a porous first metal oxide; and
a second metal particle on the porous first metal oxide,
wherein an amount of the visible light active photocatalytic material ranges from 4% to 10% by weight based on an amount of the visible light-activated photocatalytic coating composition; and

an aqueous solvent.

2. The air purification filter of claim 1 , wherein the visible light active photocatalytic material has an activity against visible light in the wavelength range of 380 nm to 500 nm.

3. The air purification filter of claim 1 , wherein the first metal oxide comprises at least one selected from the group consisting of titanium oxide, tungsten oxide, zinc oxide, and niobium oxide.

4. The air purification filter of claim 1 , wherein the second metal of the second metal particle comprises a transition metal, a noble metal, or both.

5. The air purification filter of claim 4 , wherein the second metal comprises at least one selected from the group consisting of tungsten, chromium, vanadium, molybdenum, copper, iron, cobalt, manganese, nickel, platinum, gold, cerium, cadmium, zinc, magnesium, calcium, strontium, barium, radium, and palladium.

6. The air purification filter of claim 1 , wherein a weight ratio between the porous first metal oxide and the second metal particle in the visible light active photocatalytic material ranges from 1:0.001 to 1:0.1.

7. The air purification filter of claim 1 , wherein an amount of the aqueous solvent ranges from 90% to 96% by weight based on an amount of the visible light-activated photocatalytic coating composition.

8. The air purification filter of claim 1 , wherein the aqueous solvent is water.

9. The air purification filter of claim 1 , wherein the visible light active photocatalytic material is formed into particles.

10. The air purification filter of claim 9 , wherein the visible light active photocatalytic material particles has an average diameter ranging from 30 nm to 500 mm.

11. The air purification filter of claim 1 , wherein the air purification filter does not comprise an alcohol or a binder material.

12. The air purification filter of claim 1 , wherein the porous substrate has a thickness ranging from 0.5 mm to 3.0 mm.

13. The air purification filter of claim 1 , wherein the porous first metal oxide consists of a porous tungsten oxide (WO 3 ).

14. The air purification filter of claim 13 , wherein the second metal particle consists of a platinum (Pt) particle.

Assignees

• Lg Hausys Ltd

Inventors

• Seo Joo-Hwan
• Lee Dong-Il
• Jung Seong-Moon
• Kim Ha-Na
• Jang Hye-Youn

Classifications

• B01D2259/802

  Visible light · CPC title

• B01D2257/7027

  Aromatic hydrocarbons · CPC title

• B01D2255/207

  Transition metals · CPC title

• B01D53/885

  Devices in general for catalytic purification of waste gases · CPC title

• B01D39/00

  Filtering material for liquid or gaseous fluids · CPC title