Rutile titanium dioxide nanoparticles each having novel exposed crystal face and method for producing same

• US 8,758,574 B2
• Filed: 07/13/2010
• Issued: 06/24/2014
• Est. Priority Date: 08/05/2009
• Status: Expired due to Fees

• Current Assignee: Daicel Corporation
• Original Assignee: Daicel Corporation
• Inventors: Ohno, Teruhisa
• Primary Examiner(s): Zimmer, Anthony J
• Application Number:
  US13/389,097
• Publication Number:
  US 20120132515A1
• Time in Patent Office: 1,442 Days
• Field of Search: 423610-616, 977/773, 977/775, 977/776, 502/350, 204/157.6
• US Class Current: 204/157.6
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 2231/70 Oxidation reactions, e.g. epoxidation, (di)hydroxylation, dehydrogenation and analogues
• CPC Class Codes: B01J 23/42 Platinum
• CPC Class Codes: B01J 31/06 containing polymers organometallic polymers B01J31/123; polymer-bound organometallic complexes B01J31/165; coordination polymers B01J31/1691
• CPC Class Codes: B01J 35/30 characterised by their physical properties
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 35/613 10-100 m2/g
• CPC Class Codes: B01J 35/647 2-50 nm
• CPC Class Codes: B01J 35/651 50-500 nm
• CPC Class Codes: B01J 37/035 Precipitation on carriers
• CPC Class Codes: C01G 23/047 Titanium dioxide
• CPC Class Codes: C01G 23/0536 by hydrolysing chloride-containing salts
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/85 by XPS, EDX or EDAX data
• CPC Class Codes: C01P 2004/03 obtained by SEM
• CPC Class Codes: C01P 2004/04 obtained by TEM, STEM, STM or AFM
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C07B 33/00 Oxidation in general

Abstract

Provided are: novel rutile titanium dioxide nanoparticles each having a high photocatalytic activity; a photocatalyst including the rutile titanium dioxide nanoparticles; and a method for oxidizing an organic compound using the photocatalyst. The rutile titanium dioxide nanoparticles each have an exposed crystal face (001). The rutile titanium oxide nanoparticles may be produced by subjecting a titanium compound to a hydrothermal treatment in an aqueous medium in the presence of a hydrophilic polymer. A polyvinylpyrrolidone, for example, is used as the hydrophilic polymer. An organic compound having an oxidizable moiety can be oxidized with molecular oxygen or a peroxide under photoirradiation in the presence of the photocatalyst including the rutile titanium oxide nanoparticles.

Claims

1. A rutile titanium dioxide nanoparticle having exposed crystal faces (111), (110), and (001).

2. A method for producing rutile titanium dioxide nanoparticles, comprising the step of subjecting a titanium compound to a hydrothermal treatment in the presence of a hydrophilic polymer in an aqueous medium to yield rutile titanium oxide nanoparticles each having an exposed crystal faces (111), (110), and (001) according to claim 1.

3. The method for producing rutile titanium dioxide nanoparticles according to claim 2, wherein the hydrophilic polymer is a polyvinylpyrrolidone.

4. A photocatalyst comprising rutile titanium dioxide nanoparticles each having exposed crystal faces (111), (110), and (001) according to claim 1.

5. A method for oxidizing an organic compound, comprising the step of oxidizing an organic compound having an oxidizable moiety with molecular oxygen or a peroxide under photoirradiation in the presence of a photocatalyst including rutile titanium dioxide nanoparticles each having an exposed crystal faces (111), (110), and (001) according to claim 1.

6. The rutile titanium dioxide nanoparticle according to claim 1, wherein the rutile titanium dioxide nanoparticle has only the exposed crystal faces (111), (110), and (001).