Production of reactive oxidative species by photocat alytic activation of chlorine (I) under ultraviolet/visible light/near infrared irradiation

Patent metadata

Field	Value
Publication number	US-11046592-B2
Application number	US-201916696454-A
Country	US
Kind code	B2
Filing date	Nov 26, 2019
Priority date	Nov 28, 2018
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

A system to produce reactive oxidative species in a fluid medium containing a source of Cl(I) by irradiating a solid photocatalyst suspended in the fluid medium or residing on a surface that is contactable by the fluid with electromagnetic radiation. The electromagnetic radiation can be in the UV, near-UV, visible, or near-IR consistent with the photocatalyst employed. The source of Cl(I) in certain embodiments is Cl 2 , HOCl, or H 2 NCl. The photocatalyst is g-C 3 N 4 , TiO 2 , BBiOBr, or any other solid insoluble photocatalyst.

First claim

What is claimed is:

1. A system for reactive oxidative species production, comprising:
a source of Cl(I);
a solid photocatalyst;
a source of electromagnetic radiation; and
a fluid medium, wherein the fluid medium contains the source of Cl(I), and wherein the fluid medium is in direct contact with the solid photocatalyst,
wherein the solid photocatalyst comprises g-C 3 N 4 , BBiOBr, TiO 2 /g-C 3 N 4 , Cu 2 (OH)PO 4 , or any combination thereof.

2. The system for reactive oxidative species production according to claim 1 , wherein the source of Cl(I) comprises Cl 2 , NH 2 Cl, HOCl, or any combination thereof.

3. The system for reactive oxidative species production according to claim 1 , wherein the solid photocatalyst comprises g-C 3 N 4 , Cu 2 (OH)PO 4 , or any combination thereof.

4. The system for reactive oxidative species production according to claim 1 , wherein the electromagnetic radiation is ultraviolet, near-ultraviolet, visible, near-infrared, or any combination thereof.

5. The system for reactive oxidative species production according to claim 1 , further comprising a source of oxygen.

6. The system for reactive oxidative species production according to claim 1 , wherein the source of the electromagnetic radiation comprises one or more lamps, one or more light emitting diodes (LED), sunlight, or any combination thereof.

7. The system for reactive oxidative species production according to claim 1 , wherein the fluid medium comprises water, an aqueous solution, or an aqueous suspension.

8. The system for reactive oxidative species production according to claim 1 , wherein the system is a water decontamination and/or disinfection system.

9. The system for reactive oxidative species production according to claim 1 , wherein the system is an air purification system.

10. The system for reactive oxidative species production according to claim 1 , wherein the system is a mold prevention and/or removal system.

11. The system for reactive oxidative species production according to claim 1 , wherein the system is an organic chemical reactor.

12. A method of forming reactive oxidative species, comprising:
providing the system according to claim 1 ;
combining the fluid medium and the source of Cl(I) into a mixture;
contacting the mixture with the solid photocatalyst; and
irradiating the solid photocatalyst with electromagnetic radiation.

13. A method of forming reactive oxidative species, comprising:
providing a system for reactive oxidative species production, the comprising:
a source of Cl(I);
a solid photocatalyst;
a source of electromagnetic radiation; and
a fluid medium, wherein the fluid medium contains the source of Cl(I), and wherein

the fluid medium is in direct contact with the solid photocatalyst;
combining the fluid medium and the source of Cl(I) into a mixture;
contacting the mixture with the solid photocatalyst; and
irradiating the solid photocatalyst with electromagnetic radiation,
wherein the electromagnetic radiation comprises visible light and the solid photocatalyst comprises g-C 3 N 4 , BBiOBr, or Cu 2 (OH)PO 4 .

14. The method according to claim 12 , wherein the electromagnetic radiation comprises ultraviolet light and the photocatalyst comprises TiO 2 .

15. The method according to claim 12 , wherein the source of Cl(I) comprises Cl 2 , NH 2 Cl, HOCl or any combination thereof.

16. The method according to claim 12 , wherein irradiating the solid photocatalyst comprises irradiating the solid surface suspended in the fluid medium or residing on a surface.

17. The method according to claim 12 , wherein the fluid medium is water, and wherein combining the fluid medium and the source of Cl(I) into a mixture comprises dissolving the source of Cl(I) in the water.

18. The method according to claim 13 , wherein the source of Cl(I) comprises Cl 2 , NH 2 Cl, HOCl or any combination thereof.

19. The method according to claim 13 , wherein irradiating the solid photocatalyst comprises irradiating the solid surface suspended in the fluid medium or residing on a surface.

20. The method according to claim 13 , wherein the fluid medium is water, and wherein combining the fluid medium and the source of Cl(I) into a mixture comprises dissolving the source of Cl(I) in the water.

Assignees

• Univ Hong Kong Science & Tech

Inventors

• Shang Chii
• Ling Li
• Cheng Zihang

Classifications

• B01D2251/108

  Halogens or halogen compounds · CPC title

• C02F1/32 Primary

  with ultraviolet light · CPC title

• C02F1/725 Primary

  by catalytic oxidation · CPC title

• C02F1/30

  by irradiation · CPC title

• C02F2101/34

  containing oxygen · CPC title