# US 12,758,918 B2 · Photocatalytic material, method for preparing the photocatalytic material and photocatalytic air screen filter for epidemic prevention

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- Number: US 12,758,918 B2
- Document ID: US12758918B2
- Status: Granted
- Kind: B2
- Application number: 18/314,332
- Filed: 2023-05-09
- Published: 2023-11-16
- Granted: 2026-10-13
- Earliest claimed: 2022-05-10
- Assignees: Chongqing Institute of East China Normal University; Roi Optoelectronics Technology Co, Ltd.; Yunnan Huapu Quantum Material Co., Ltd; Guangdong Roi Optoelectronics Technology Co., Ltd.; East China Normal University; Chongqing Huapu Intelligent Equipment Co., Ltd.; Chongqing Huapu Quantum Technology Co., Ltd.
- Applicants: Chongqing Institute of East China Normal University; ROI Optoelectronics Technology CO, LTD.; Yunnan Huapu quantum Material Co., Ltd; GuangDong ROI Optoelectronics Technology Co., Ltd.; East China Normal University; Chongqing Huapu Intelligent Equipment Co., Ltd.; Chongqing Huapu Quantum Technology Co., Ltd.
- Inventors: Heping Zeng; Mengyun Hu
- Web page: https://patentgrep.com/patent/US12758918B2

## CPC

- B01D 53/885: {Devices in general for catalytic purification of waste gases}
- A01N 31/08: Oxygen or sulfur directly attached to an aromatic ring system
- A01N 59/16: Heavy metals; Compounds thereof
- A61L 9/22: Ionisation
- B01D 46/0028: {provided with antibacterial or antifungal means}
- B01D 53/8668: {Removing organic compounds not provided for in B01D53/8603 - B01D53/8665}
- B01D 53/8687: {Organic components}
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 21/18: Carbon
- B01J 35/39: Photocatalytic properties
- B01J 37/0036: {Grinding}
- F24F 8/167: using catalytic reactions
- B01D 2255/20707: Titanium
- B01D 2255/702: Carbon
- B01D 2255/802: Photocatalytic
- B01D 2257/708: Volatile organic compounds V.O.C.'s
- B01D 2257/91: Bacteria; Microorganisms
- B01D 2259/4508: for cleaning air in buildings
- B01D 2279/50: for air conditioning
- B01J 35/45: Nanoparticles
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)

## Abstract

A photocatalytic material includes activated carbon, titanium dioxide, zinc oxide, graphene, tourmaline powders, a nano-copper solution, carvacrol and deionized water. The photocatalytic material is prepared by mixing the activated carbon, the titanium dioxide, the zinc oxide, the graphene, the tourmaline powders, the nano-copper solution, the carvacrol and the deionized water for a period ranging from 1 to 12 hours. A photocatalytic air screen filter for epidemic prevention includes a substrate and the photocatalytic material. The photocatalytic material is applied on a surface of the substrate, and the photocatalytic material is dried and cured. An amount of the material loaded on the surface of the substrate is in a range of 0.1 to 100 mg/cm2.

## Claims

### Claim 1

A photocatalytic material, comprising activated carbon, titanium dioxide, zinc oxide, graphene, tourmaline powders, a nano-copper solution, carvacrol and deionized water, wherein the activated carbon includes bamboo charcoal, coconut shell activated carbon, and coke carbon.

### Claim 2 (depends on 1)

The photocatalytic material of claim 1, wherein a mass ratio of the activated carbon to the deionized water is 1-100, a mass ratio of the titanium dioxide to the deionized water is 1-100, a mass ratio of the zinc oxide to the deionized water is 1-100, a mass ratio of the graphene to the deionized water is 1-100, a mass ratio of the tourmaline powders to the deionized water is 1-100, a mass ratio of the nano-copper solution to the deionized water is 1-100, and a mass ratio of the carvacrol to the deionized water is 1-1000.

### Claim 3 (depends on 1)

The photocatalytic material of claim 1, wherein the activated carbon has a specific surface area greater than 500 m2/g and a particle size of 1 to 3 μm.

### Claim 4 (depends on 1)

A method for preparing the photocatalytic material of claim 1, wherein the activated carbon, the titanium dioxide, the zinc oxide, the graphene, the tourmaline powders, the nano-copper solution, the carvacrol and the deionized water are mixed for a period ranging from 1 to 12 hours.

### Claim 5 (depends on 4)

The method of claim 4, wherein the activated carbon, the titanium dioxide, the zinc oxide, the graphene, the tourmaline powders, the nano-copper solution, the carvacrol and the deionized water are mixed by using a ball mill.

### Claim 6 (depends on 1)

A photocatalytic air screen filter for epidemic prevention, comprising a substrate and the photocatalytic material of claim 1, wherein the photocatalytic material is applied on a surface of the substrate, and the photocatalytic material is dried and cured.

### Claim 7 (depends on 6)

The photocatalytic air screen filter of claim 6, wherein the photocatalytic material is applied to the surface of the substrate by using an adhesive.

### Claim 8 (depends on 7)

The photocatalytic air screen filter of claim 7, wherein the photocatalytic material and the adhesive are mixed in a mass ratio of 1:10 to obtain a mixture and the mixture is applied to the surface of the substrate.

### Claim 9 (depends on 6)

The photocatalytic air screen filter of claim 6, wherein the photocatalytic material is dried and cured by placing the photocatalytic material into a vacuum drying oven for drying at a drying temperature ranging from 50 to 60° C. for a drying period ranging from 2 to 6 hours.

### Claim 10 (depends on 8)

The photocatalytic air screen filter of claim 8, wherein a mixed solution of the photocatalytic material and the adhesive is applied on the surface of the substrate by electrospinning or nanospraying.

### Claim 11 (depends on 8)

The photocatalytic air screen filter of claim 8, wherein the substrate is immersed in a mixed solution of the photocatalytic material and the adhesive.

### Claim 12 (depends on 8)

The photocatalytic air screen filter of claim 8, wherein an amount of the photocatalytic material and the adhesive loaded on the surface of the substrate is in a range of 0.1 to 100 mg/cm2.

### Claim 13 (depends on 8)

The photocatalytic air screen filter of claim 8, wherein the adhesive is a polyacrylic ester solution.

### Claim 14 (depends on 6)

The photocatalytic air screen filter of claim 6, wherein the substrate is made of a material selected from non-woven fabric, glass fiber, terylene cotton, nylon, polyester fiber or any combination thereof.