Filtering article containing titania nanotubes

• US 10,702,833 B2
• Filed: 10/19/2018
• Issued: 07/07/2020
• Est. Priority Date: 02/06/2013
• Status: Active Grant

• Current Assignee: Northeastern University
• Original Assignee: Northeastern University
• Inventors: Panaitescu, Eugen, Menon, Latika
• Primary Examiner(s): Huang, Ryan B
• Application Number:
  US16/165,661
• Publication Number:
  US 20190201853A1
• Time in Patent Office: 627 Days
• CPC Class Codes: B01D 15/08 Selective adsorption, e.g. chromatography
• CPC Class Codes: B01D 2323/00 Details relating to membrane preparation
• CPC Class Codes: B01D 2325/20 Specific permeability or cut-off range
• CPC Class Codes: B01D 2325/36 Hydrophilic membranes
• CPC Class Codes: B01D 67/0044 by chemical reaction
• CPC Class Codes: B01D 67/0065 by anodic oxidation
• CPC Class Codes: B01D 69/02 characterised by their properties
• CPC Class Codes: B01D 69/04 Tubular membranes
• CPC Class Codes: B01D 69/043 characterised by the tube diameter
• CPC Class Codes: B01D 71/024 Oxides
• CPC Class Codes: C01G 23/047 Titanium dioxide
• CPC Class Codes: C01P 2004/03 obtained by SEM
• CPC Class Codes: C01P 2004/13 Nanotubes
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C25D 11/02 Anodisation
• CPC Class Codes: C25D 11/26 of refractory metals or alloys based thereon
• CPC Class Codes: C25D 7/04 Tubes; Rings; Hollow bodies

Abstract

Provided in one embodiment is filtering article, comprising: powders comprising bundles of nanotubes, each bundle comprising hollow titania nanotubes. Embodiments of the methods of making and using the filtering articles are also provided.

Claims

1. A method of making a filtering article, the method comprising:

a) anodizing titanium in an aqueous electrolyte solution to form powders comprising bundles of hollow titania nanotubes;

b) recovering the powders comprising bundles of hollow titania nanotubes from the aqueous electrolyte solution; and

c) integrating a membrane with the powders comprising bundles of hollow titania nanotubes to form the filtering article.

2. The method of claim 1, wherein the aqueous electrolyte solution comprises at least about 1 mM chloride and has a pH in the range of about 1 to about 7.

3. The method of claim 1, the method further comprising sintering the powders comprising bundles of hollow titania nanotubes to form the filtration article.

4. The method of claim 1, the method further comprising functionalizing at least some of the hollow titania nanotubes with at least one of a hydrophobic and an olephobic material.

5. A method of making a filtering article, the method comprising:

a) anodizing titanium in an aqueous electrolyte solution to form powders comprising bundles of hollow titania nanotubes; and

b) recovering the powders comprising bundles of hollow titania nanotubes from the aqueous electrolyte solution; and

c) forming the powders comprising bundles of hollow titania nanotubes into a hollow cylinder.

6. The method of claim 5, wherein the hollow cylinder has an internal diameter from about 0.5 cm to about 10 cm.