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-9902141-B2
Application number	US-201514658990-A
Country	US
Kind code	B2
Filing date	Mar 16, 2015
Priority date	Mar 14, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

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 synthesizing a water purification membrane, the method comprising:
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; and
cross-linking the plurality of GO nanosheets by 1,3,5-benzenetricarbonyl trichloride on a polysulfone support.

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

3. The method of claim 1 , wherein the plurality of GO nanosheets are negatively charged over a wide pH range.

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 lateral sizes of the plurality of GO nanosheets vary between 100 and 5000 nm.

7. The method of claim 1 , wherein a thickness of the plurality of GO nanosheets varies between 1 and 2 nm.

8. The method of claim 1 , wherein the stacking results in at least a portion of the plurality of GO nanosheets being arranged in a non-overlapping manner.

9. A method for synthesizing a water purification membrane, the method comprising:
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;
electrostatically bonding 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,
wherein a structure, a charge, and a functionality of the plurality of GO nanosheets is tuned by using a polyelectrolyte, and
wherein the plurality of GO nanosheets are negatively-charged over a wide pH range, and wherein the polyelectrolyte is positively-charged over a wide pH range.

10. The method of claim 9 , wherein the polyelectrolyte is polyethyleneimine (PEI).

11. The method of claim 9 , wherein the polyelectrolyte is poly-L-lysine (PLL) poly-L-lysine (PLL).

12. The method of claim 9 , wherein the polyelectrolyte is polyallylamine hydrochloride (PAH).

13. The method of claim 9 , wherein stacking the plurality of GO nanosheets further comprises stacking the plurality of negatively-charged GO nanosheets and the plurality of GO nanosheets tuned by using the positively-charged polyelectrolyte alternatingly.

14. The method of claim 9 , wherein lateral sizes of the plurality of GO nanosheets vary between 100 and 5000 nm.

15. The method of claim 9 , wherein a thickness of the plurality of GO nanosheets varies between 1 and 2 nm.

16. The method of claim 9 , wherein the stacking results in at least a portion of the plurality of GO nanosheets being arranged in a non-overlapping manner.

Assignees

• Univ Maryland

Inventors

• Mi Baoxia
• Hu Meng

Classifications

• B01D69/148

  Organic/inorganic mixed matrix membranes · CPC title

• B32B2310/025

  Electrostatic charges · CPC title

• Y10T156/10

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

• C01B32/23

  Oxidation · CPC title

• B01D67/0006

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