Photocatalytic active carbon, colored photocatalytic active carbon, coloring active carbon, and deodorant and adsorption product using them

• US 6,673,738 B2
• Filed: 04/03/2002
• Issued: 01/06/2004
• Est. Priority Date: 11/28/2001
• Status: Expired due to Fees

• Current Assignee: K.K. Ueda Shikimono Kojyo
• Original Assignee: K.K. Ueda Shikimono Kojyo
• Inventors: Nishimura, Motoyoshi, Ueda, Toshiya
• Primary Examiner(s): Bell, Mark L.
• Assistant Examiner(s): Hailey, Patricia L.
• Application Number:
  US10/115,549
• Publication Number:
  US 20030100445A1
• Time in Patent Office: 643 Days
• Field of Search: 502/180, 502/182, 502/183, 502/416, 502/417, 106/472, 106/474, 106/400, 106/492
• US Class Current: 502/180
• CPC Class Codes: B01J 20/0211 Compounds of Ti, Zr, Hf
• CPC Class Codes: B01J 20/06 comprising oxides or hydroxides of metals not provided for in group B01J20/04
• CPC Class Codes: B01J 20/20 comprising free carbon; comprising carbon obtained by carbonising processes
• CPC Class Codes: B01J 20/28002 characterised by their physical properties
• CPC Class Codes: B01J 20/2808 being less than 2 nm, i.e. micropores or nanopores
• CPC Class Codes: B01J 20/28097 being coated, filled or plugged with specific compounds
• CPC Class Codes: B01J 20/3078 Thermal treatment, e.g. calcining or pyrolizing
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3236 containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts
• CPC Class Codes: B01J 20/3289 Coatings involving more than one layer of same or different nature
• CPC Class Codes: B01J 21/06 Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 21/18 Carbon
• CPC Class Codes: B01J 2220/485 Plants or land vegetals, e.g. cereals, wheat, corn, rice, sphagnum, peat moss
• CPC Class Codes: B01J 2220/49 Materials comprising an indicator, e.g. colour indicator, pH-indicator
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/0238 via the gaseous phase-sublimation
• CPC Class Codes: B09C 1/08 chemically

Abstract

A photocatalytic active carbon capable of demonstrating a stable deodorizing and adsorbing ability for a prolonged period of time is produced by depositing a coating of a photocatalyst on the surface of the active carbon by means of vapor deposition. Colored photocatalytic active carbon coloring active carbon including the photocatalytic active carbon, which while maintaining the adsorbing action and the decomposing and sterilizing action, comes to be rich in color variations and capable of improving visual design and handling are produced by subjecting the surface of the active carbon to coloring treatment and/or treatment with a compound having coloring or discoloring properties upon hydration.

Claims

1. A photocatalytic active carbon comprising active carbon and a coating of a photocatalyst formed by means of vapor deposition on a surface of the active carbon and a photocatalytic active carbon having been subjected to a coloring treatment comprising directly depositing a coating of a dye or pigment on the photocatalytic active carbon by means of vapor deposition.

2. The photocatalytic active carbon according to claim 1, wherein the active carbon is produced from coconut shell.

3. The photocatalytic active carbon according to claim 1 or 2, wherein the photocatalyst is at least one member selected from the group consisting of TiO₂, ZnO, SrTiO₃, CdS, CdO, CaP, InP, In₂O₃, CaAs, BaTiO₃, K₂NbO₃, Fe₂O₃, Ta₂O₅, WO₃, SaO₂, Bi₂O₃, NiO, Cu₂O, SiC, SiO₂, MoS₂, MoS₃, InPb, RuO₂ and CeO₂.

4. The photocatalytic active carbon according to claim 1 or 2, wherein the coating of the photocatalyst comprises TiO2.

5. A deodorant and adsorbent product comprising a photocatalytic active carbon according to claim 1 or 2.

6. A photocatalytic active carbon according to claim 1, wherein the vapor deposition is thermal vapor deposition.

7. A coloring photocatalytic active carbon comprising a photocatalytic active carbon comprising active carbon, a coating of photocatalyst formed by means of vapor deposition on a surface of the active carbon, and a compound having coloring or discoloring properties upon hydration carried on a surface of the photocatalytic active carbon.

8. A deodorant and absorbent product comprising a coloring photocatalytic active carbon according to claim 7.

9. A coloring photocatalytic active carbon comprising a colored photocatalytic active carbon and a compound having coloring or discoloring properties upon hydration carried on a surface of the colored photocatalytic active carbon, the colored photocatalytic active carbon comprising active carbon and coating of a photocatalyst formed by means of vapor deposition on surface of the active carbon.

10. The colored photocatalytic active carbon according to claim 9, wherein the coloring treatment comprises directly depositing a coating of a dye or pigment on the photocatalytic active carbon by means of vapor deposition.

11. The colored photocatalytic active carbon according to claim 10, wherein the pigment is at least one member selected from the group consisting of a white pigment, an extender pigment, a chromatic pigment, a special pigment and a metallic pigment.

12. The colored photocatalytic active carbon according to claim 10, wherein the pigment is at least one member selected from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, lithopone, a zinc pigment, antimony oxide, zirconium oxide, zircon, hydrous magnesium aluminum silicate, calcium carbonate, barium sulfate, silicate, potassium aluminosilicate, hydrated alumina, an iron oxide pigment, lead chromate, lead molybdate, a cadmium pigment, a synthetic metal oxide mixture, Prussian blue, zinc yellow, basic zinc chromate, strontium chromate, red lead, copper oxide (I), calcium plumbate, basic lead silicochromate, white molybdate, modified barium metaborate, zinc phosphate and pearl essence.

13. A deodorant and absorbent product comprising a colored photocatalytic active carbon according to claim 9.