Co-doped titanium oxide foam and water disinfection device

Patent metadata

Field	Value
Publication number	US-9242873-B2
Application number	US-80901708-A
Country	US
Kind code	B2
Filing date	Dec 18, 2008
Priority date	Dec 19, 2007
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A quaternary oxide foam, comprises an open-cell foam containing (a) a dopant metal, (b) a dopant nonmetal, (c) titanium, and (d) oxygen. The foam has the advantages of a high surface area and a low back pressure during dynamic flow applications. The inactivation of Escherichia coli ( E. coli ) was demonstrated in a simple photoreactor.

First claim

What is claimed is:

1. A quaternary oxide foam, comprising an open-cell foam comprising titanium oxide containing:
(a) a dopant metal comprising palladium,
(b) a dopant nonmetal,
(c) titanium, and
(d) oxygen,
wherein the dopant metal is present at a concentration of at most 2 wt. %, and wherein the open-cell foam comprises a pore size distribution having at least two peaks.

2. The quaternary oxide foam of claim 1 , wherein the atomic ratio of titanium, oxygen and dopant nonmetal is 1:0.5-1.99:0.01-1.5.

3. The quaternary oxide foam of claim 1 , wherein the atomic ratio of titanium, oxygen and dopant nonmetal is 1:1.9-1.99:0.01-0.1.

4. The quaternary oxide foam of claim 1 , wherein the dopant nonmetal is nitrogen.

5. The quaternary oxide foam of claim 4 , wherein the foam has a porosity of at least 90%.

6. The quaternary oxide foam of claim 4 , wherein the foam has a porosity of 90-98%.

7. The quaternary oxide foam of claim 4 , wherein the foam is monolithic with a longest dimension of at least 0.1 mm.

8. The quaternary oxide foam of claim 4 , wherein the foam is monolithic with a longest dimension of at least 0.5 mm.

9. The quaternary oxide foam of claim 4 , wherein the foam is monolithic with a longest dimension at least 1 mm.

10. The quaternary oxide foam of claim 4 , wherein visible light will lose less than 75% of its intensity when passed through 1 cm of the foam.

11. The quaternary oxide foam of claim 4 , wherein visible light will lose less than 50% of its intensity when passed through 1 cm of the foam.

12. A method of catalyzing a reaction, comprising:
exposing a quaternary oxide foam to light; and
contacting the quaternary oxide foam with a reactant, to form a product of the reaction;
wherein the quaternary oxide foam comprises an open-cell foam comprising titanium oxide containing:
(a) a dopant metal comprising palladium,
(b) a dopant nonmetal,
(c) titanium, and
(d) oxygen,
wherein the dopant metal is present at a concentration of at most 2 wt. %, and wherein the open-cell foam comprises a pore size distribution having at least two peaks.

13. A reactor, comprising:
(i) an inlet,
(ii) an outlet, and
(iii) a catalyst, fluidly connected to the inlet and the outlet,
wherein the catalyst comprises a quaternary oxide foam comprising an open-cell foam comprising titanium oxide containing:
(a) a dopant metal comprising palladium,
(b) a dopant nonmetal,
(c) titanium, and
(d) oxygen,
wherein the dopant metal is present at a concentration of at most 2 wt. %, and wherein the open-cell foam comprises a pore size distribution having at least two peaks.

14. A quaternary oxide foam, prepared by a method comprising:
impregnating an open-cell template foam with a liquid mixture; and
heating the impregnated open-cell foam, to form the quaternary oxide foam comprising titanium dioxide including a dopant metal and a dopant nonmetal;
wherein the liquid mixture contains
(a) the dopant metal comprising palladium,
(b) the dopant nonmetal, and
(c) titanium,
wherein the dopant metal is present in the quaternary oxide foam at a concentration of at most 2 wt. %, and wherein the open-cell foam comprises a pore size distribution having at least two peaks.

Assignees

• Shang Jian-Ku
• Wu Pinggui
• Xie Rong-Cai
• Univ Illinois

Inventors

• Shang Jian-Ku
• Wu Pinggui
• Xie Rong-Cai

Classifications

• B01J35/56

  Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title

• B01J23/44

  Palladium · CPC title

• B01J23/28

  Molybdenum · CPC title

• C04B2111/00793

  as filters or diaphragms · CPC title

• C04B38/00

  Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof (treating slag with gases or gas generating material C04B5/06 {; expanded graphite C04B35/536}) · CPC title