Polymer composition containing sulfonated carbon nanotube and sulfonated graphene oxide for fabricating hydrophilic separation membrane

Patent metadata

Field	Value
Publication number	US-11731087-B2
Application number	US-201616341266-A
Country	US
Kind code	B2
Filing date	Dec 27, 2016
Priority date	Oct 13, 2016
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

The present invention relates to a hydrophilic separation membrane polymer composition containing a sulfonated graphene oxide and a sulfonated carbon nanotube, and a hydrophilic separation membrane fabricated therefrom. A hydrophilic separation membrane according to the present invention has the advantage of being very high in water permeability and excellent in anti-fouling properties.

First claim

The invention claimed is:

1. A polymer composition for preparing a hydrophilic separation membrane, comprising: a sulfonated graphene oxide, sulfonated carbon nanotubes, and a base resin, wherein the base resin is one or two or more selected from the group consisting of a hydrophobic halogenated polymer, a hydrophobic polysulfone-based polymer, and a hydrophobic polyolefin-based polymer; based on the total mass of the composition, the sulfonated graphene oxide is included in 1 to 4 wt. %, and the sulfonated carbon nanotubes is included in 1 to 4 wt. %; and wherein the hydrophilic separation membrane satisfies the following Equation 1:

2
⁢

⁢

F
S

F
SGO

+

F
SCNT

≥
1.2

[

Equation
⁢

⁢
1

]

wherein F S is a water flux (L/m 2 ·h) of the hydrophilic separation membrane; F SGO is a water flux (L/m 2 ·h) of a separation membrane including a sulfonated graphene oxide; F SCNT is a water flux (L/m 2 ·h) of a separation membrane including sulfonated carbon nanotubes.

2. The polymer composition for preparing a hydrophilic separation membrane of claim 1 , wherein the sulfonated graphene oxide has an atomic ratio of sulfur atoms relative to carbon atoms on a surface thereof being 10 to 40%.

3. The polymer composition for preparing a hydrophilic separation membrane of claim 1 , wherein the sulfonated carbon nanotubes have an atomic ratio of sulfur atoms relative to carbon atoms on a surface of the carbon nanotubes being 10 to 40%.

4. The polymer composition for preparing a hydrophilic separation membrane of claim 1 , wherein the sulfonated carbon nanotubes are sulfonated multi-walled carbon nanotubes.

5. The polymer composition for preparing a hydrophilic separation membrane of claim 1 , wherein the base resin includes sulfonated polyvinylidene fluoride.

6. The polymer composition for preparing a hydrophilic separation membrane of claim 5 , further comprising: one or two or more additives selected from the group consisting of water-soluble polymers and water-soluble salts.

7. The polymer composition for preparing a hydrophilic separation membrane of claim 6 , wherein the composition comprises 10 to 35 wt % of the sulfonated polyvinylidene fluoride, 0.1 to 15 wt % of the additive, and a balance of a solvent.

8. A hydrophilic separation membrane prepared with the polymer composition for preparing a hydrophilic separation membrane of claim 1 .

9. The hydrophilic separation membrane of claim 8 , wherein the hydrophilic separation membrane is an ultrafiltration membrane, a microfiltration membrane, a hollow fiber membrane, or a nanofiltration membrane.

Assignees

• Univ Yeungnam Res Cooperation Foundation

Inventors

• Ahn Young Ho
• Ayyaru Sivasankaran

Classifications

• B01D67/0011

  Casting solutions therefor · CPC title

• B01D67/00165

  Composition of the coagulation baths · CPC title

• B01D69/1411

  containing dispersed material in a continuous matrix · CPC title

• B01D71/0211

  Graphene or derivates thereof · CPC title

• B01D71/34 Primary

  Polyvinylidene fluoride · CPC title