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