Layer-by-layer assembly of graphene oxide membranes via electrostatic interaction and eludication of water and solute transport mechanisms

Patent metadata

Field	Value
Publication number	US-10239302-B2
Application number	US-201815905219-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Mar 14, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A method for synthesizing a water purification membrane is presented. The method includes stacking a plurality of graphene oxide (GO) nanosheets to create the water purification membrane, the stacking involving layer-by-layer assembly of the plurality of GO nanosheets and forming a plurality of nanochannels between the plurality of GO nanosheets for allowing the flow of a fluid and for rejecting the flow of contaminants. The method further includes cross-linking the plurality of GO nanosheets by 1,3,5-benzenetricarbonyl trichloride on a polydopamine coated polysulfone support.

First claim

What is claimed is:

1. A method for creating a water separation membrane, the method comprising:
depositing a plurality of graphene oxide (GO) nanosheets via a layer-by-layer assembly;
bonding the plurality of GO nanosheets with each other and with a support substrate; and
cross-linking the plurality of GO nanosheets by 1,3,5-benzenetricarbonyl trichloride on the support substrate.

2. The method of claim 1 , further comprising covalently bonding the plurality of GO nanosheets via cross-linkers.

3. The method of claim 1 , wherein the cross-linkers are monomers and polymers.

4. The method of claim 1 , further comprising electrostatically bonding the plurality of GO nanosheets.

5. The method of claim 4 , wherein a structure, a charge, and a functionality of the plurality of GO nanosheets is tuned by using polyelectrolytes.

6. The method of claim 1 , wherein the support substrate is a polydopamine coated polysulfone support substrate.

7. The method of claim 1 , wherein the plurality of GO nanosheets are negatively charged.

8. The method of claim 1 , further comprising forming a plurality of nanochannels between the plurality of GO nanosheets for allowing the flow of a fluid and for rejecting the flow of contaminants.

9. A method for creating a water separation membrane, the method comprising:
depositing a plurality of graphene oxide (GO) nanosheets via a layer-by-layer assembly;
electrostatically bonding the plurality of GO nanosheets with each other and with a support substrate; and
tuning a structure, a charge and functionality of the plurality of GO nanosheets by using electrolytes.

10. The method of claim 9 , wherein the support substrate is a polydopamine coated polysulfone support substrate.

11. The method of claim 9 , further comprising covalently bonding the plurality of GO nanosheets via cross-linkers.

12. The method of claim 11 , wherein the cross-linkers are monomers and polymers.

13. The method of claim 9 , further comprising cross-linking the plurality of GO nanosheets by 1,3,5-benzenetricarbonyl trichloride on the support substrate.

14. The method of claim 9 , wherein the plurality of GO nanosheets are negatively charged.

15. The method of claim 9 , further comprising forming a plurality of nanochannels between the plurality of GO nanosheets for allowing the flow of a fluid and for rejecting the flow of contaminants.

Assignees

• Univ Maryland

Inventors

• Mi Baoxia
• Hu Meng

Classifications

• B01D2325/14

  Membrane materials having negatively charged functional groups · CPC title

• B01D67/0006

  by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125) · CPC title

• Y02P20/133

  Renewable energy sources, e.g. sunlight · CPC title

• C01B32/198

  Graphene oxide · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title