PHOTOCATALYST, PREPARATION METHOD THEREOF, PHOTO REACTOR, AND PHOTOLYSIS PROCESS

• US 20100294646A1
• Filed: 11/05/2009
• Published: 11/25/2010
• Est. Priority Date: 05/25/2009
• Status: Abandoned Application

• Current Assignee: Sungkyunkwan University Foundation For Corporate Collaboration (SungKyunKwan University (SKKU))
• Original Assignee: Sungkyunkwan University Foundation For Corporate Collaboration (SungKyunKwan University (SKKU))
• Inventors: KIM, Moon-Sun, Kim, Byung-Woo, Cho, Hong-Kwan, Kim, Ji-Sun
• Application Number:
  US12/612,731
• Publication Number:
  US 20100294646A1
• Time in Patent Office: Days
• US Class Current: 204/157.61
• CPC Class Codes: B01D 2255/1021 Platinum
• CPC Class Codes: B01D 2255/1026 Ruthenium
• CPC Class Codes: B01D 2255/20707 Titanium
• CPC Class Codes: B01D 2255/802 Photocatalytic
• CPC Class Codes: B01D 53/8687 Organic components
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 23/42 Platinum
• CPC Class Codes: B01J 2531/821 Ruthenium
• CPC Class Codes: B01J 31/1616 Coordination complexes, e.g. organometallic complexes, immobilised on an inorganic support, e.g. ship-in-a-bottle type catalysts catalysts comprising molecular sieves B01J29/00
• CPC Class Codes: B01J 31/1815 with more than one complexing nitrogen atom, e.g. bipyridyl, 2-aminopyridine
• CPC Class Codes: B01J 31/182 comprising aliphatic or saturated rings
• CPC Class Codes: B01J 31/38 of titanium, zirconium or hafnium
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/0018 Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
• CPC Class Codes: B01J 37/03 Precipitation; Co-precipitation
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The present invention relates to a photocatalyst comprising a core part containing titanium dioxide, and a doped part formed on surfaces of said core part, containing a ruthenium-based dye and a platinum compound, a preparation method thereof, a photoreactor and a photolysis process. In accordance with the present invention, a photocatalyst having excellent light resistance and photosensitivity capable of removing volatile organic compounds even in poor ultraviolet light conditions, and a preparation method thereof is provided, and a photoreactor comprising said photocatalyst and an efficient photolysis process using the same are also provided.

Claims

1. A photocatalyst comprising a core part containing titanium dioxide;

and

a doped part, formed on surfaces of said core part, containing a ruthenium-based dye and a platinum compound.

2. The photocatalyst according to claim 1, wherein the titanium dioxide has a specific surface area of 50 m²/g to 350 m²/g.

3. The photocatalyst according to claim 1, wherein the ruthenium-based dye is a compound represented by Formula 1, or a salt thereof:

RuL₂(M)₂ 

 

[Formula 1]

wherein, “

L”

is 2,2′

-bipyridine containing at least one functional group selected from the group consisting of hydrogen, a C_1-12 alkyl group and —

C(═

O))R₁, where R₁ is hydrogen or tetrabutylammonium, and M is NCS, CN, Cl, Br or I.

4. The photocatalyst according to claim 1, wherein the platinum compound is platinum, or a platiniferous compound.

5. The photocatalyst according to claim 1, wherein the photocatalyst comprises 0.01 to 5 parts by weight of the ruthenium-based dye;

and 0.01 to 2 parts by weight of the platinum compound, relative to 100 parts by weight of titanium dioxide.

6. The photocatalyst according to claim 1, wherein the ruthenium-based dye and the platinum compound are doped sequentially on the core part.

7. A method of preparing a photocatalyst according to claim 1 comprising a step of doping a ruthenium-based dye and a platinum compound on surfaces of titanium dioxide.

8. The method of preparing a photocatalyst according to claim 7, wherein titanium dioxide is prepared by a first synthesis process comprising

the step (1) of extracting and separating a surfactant from a reactant containing a solvent, a surfactant and titanium alkoxide;

and

the step (2) of sintering the residual reactant from which the surfactant is separated in said step (1).

9. The method of preparing a photocatalyst according to claim 8, wherein the reactant in the step (1) comprises 2 to 25 parts by weight of the surfactant;

and 1 to 10 parts by weight of titanium alkoxide, relative to 100 parts by weight of the solvent.

10. The method of preparing a photocatalyst according to claim 7, wherein titanium dioxide is prepared by a second synthesis process comprising

the step (A) of reacting a mixture containing a solvent, titanium alkoxide and an activated carbon;

and

the step (B) of heat treating the reactant obtained in the step (A) to burn the activated carbon.

11. The method of preparing a photocatalyst according to claim 10, wherein the activated carbon has an average particle diameter of 0.1 to 10 μ

m.

12. The method of preparing a photocatalyst according to claim 10, wherein the mixture in the step (A) comprises 5 to 15 parts by weight of titanium alkoxide;

and 0.5 to 10 parts by weight of the activated carbon, relative to 100 parts by weight of the solvent.

13. The method of preparing a photocatalyst according to claim 10, wherein the heat treatment in the step (B) is carried out at a temperature of 400 to 700°

C.

14. A photoreactor comprising a support;

and

a photocatalyst layer, formed on said support, containing a photocatalyst according to claim 1.

15. A photolysis process comprising a step of providing a photoreactor according to claim 14 with volatile organic compounds and moisture.

16. A method of preparing a photocatalyst according to claim 2 comprising a step of doping a ruthenium-based dye and a platinum compound on surfaces of titanium dioxide.

17. A method of preparing a photocatalyst according to claim 3 comprising a step of doping a ruthenium-based dye and a platinum compound on surfaces of titanium dioxide.

18. A method of preparing a photocatalyst according to claim 4 comprising a step of doping a ruthenium-based dye and a platinum compound on surfaces of titanium dioxide.

19. A method of preparing a photocatalyst according to claim 5 comprising a step of doping a ruthenium-based dye and a platinum compound on surfaces of titanium dioxide.

20. A method of preparing a photocatalyst according to claim 6 comprising a step of doping a ruthenium-based dye and a platinum compound on surfaces of titanium dioxide.