Degradation of organic chemicals with titanium ceramic membranes

• US 5,035,784 A
• Filed: 06/18/1990
• Issued: 07/30/1991
• Est. Priority Date: 07/27/1987
• Status: Expired due to Term

• Current Assignee: Wisconsin Alumni Research Foundation (University of Wisconsin System)
• Original Assignee: Wisconsin Alumni Research Foundation (University of Wisconsin System)
• Inventors: Tunesi, Simonetta, Anderson, Marc A., Xu, Qunyin
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/540,408
• Time in Patent Office: 407 Days
• Field of Search: 204/158.14, 204/914, 208/262.5, 585/469, 210/748, 210/909
• US Class Current: 204/158.14
• CPC Class Codes: A62D 2101/22 containing halogen
• CPC Class Codes: A62D 2101/28 containing oxygen, sulfur, selenium or tellurium, i.e. chalcogen
• CPC Class Codes: A62D 3/176 Ultraviolet radiations, i.e. radiation having a wavelength of about 3nm to 400nm
• CPC Class Codes: B01J 16/005 in the presence of catalytically active bodies, e.g. porous plates
• CPC Class Codes: B01J 19/123 Ultraviolet light
• CPC Class Codes: Y10S 204/914 Only carbon, hydrogen or halogen atom in treating agent
• CPC Class Codes: Y10S 210/909 Aromatic compound, e.g. pcb, phenol

Abstract

Complex organic molecules, such as polychlorinated biphenyls can be degraded on porous titanium ceramic membranes by photocatalysis under ultraviolet light.

Claims

1. A method of degrading complex organic molecules comprising the steps of exposing the organic molecules in solution to a ceramic porous membrane of titanium;

and irradiating the titanium membrane with ultraviolet light wherein the step of exposing the complex organic molecules to the membrane includes adsorbing the molecules in the membrane.

2. A method of degrading complex organic molecules comprising the steps of exposing the complex organic molecules to a porous metal oxide ceramic membrane of a transition metal by adsorbing the molecules in the membrane and irradiating the membrane with ultraviolet light.

3. A method as claimed in claim 2 wherein the complex organic molecules are polychlorinated biphenyls.

4. A method of degrading complex organic molecules comprising the steps of adsorbing the organic molecules in the gaseous phase into a porous metal oxide ceramic membrane and irradiating the membrane with ultraviolet light.

5. A method as claimed in claim 4 wherein the metal is titanium.

6. A method of degrading complex organic molecules comprising the steps of exposing the organic molecules in the gaseous phase to a porous metal oxide ceramic membrane and irradiating the membrane with ultraviolet light wherein the membrane is coated onto the exterior of the light source.

7. A method of degrading complex organic molecules comprising the steps of exposing the organic molecules in the gaseous phase to a porous metal oxide ceramic membrane and irradiating the membrane with ultraviolet light from an optical fiber wherein the membrane is coated onto the exterior of the optical fiber carrying the ultraviolet light.

8. A method of degrading complex organic molecules comprising the steps of exposing the complex organic molecules to a porous metal oxide ceramic body of a transition metal by adsorbing the molecules in the body and irradiating the adsorbed molecules with ultraviolet light.