A method of preparing a graphene-based membrane is provided. The method may include providing a stacked arrangement of layers of a graphene-based material, wherein the layers of the graphene-based material define one or more nanochannels between neighboring layers, and varying an electrical charge on a surface of the layers of the graphene-based material defining the one or more nanochannels to control size selectivity and/or ionic selectivity of the graphene-based membrane. A graphene-based membrane and a method of separating ions from a fluid stream are also provided.

A membrane for the capture of carbon dioxide is provided. The membrane includes a polymeric porous hollow fiber substrate and a coating disposed on a surface of the polymeric porous hollow fiber substrate, where the coating comprises graphene oxide and an amine. A method of forming a coated polymeric hollow fiber support for the capture of carbon dioxide is also provided. The method includes dispersing graphene oxide in a coating solution comprising a solvent; dispersing an amine in the coating solution; and exposing a polymeric hollow fiber support to the coating solution to form a coating on a surface of the polymeric hollow fiber support, wherein the coated polymeric hollow fiber support has a carbon dioxide/nitrogen selectivity ranging from about 200 to about 2000 and a carbon dioxide permeance ranging from about 100 gas permeation units to about 1000 gas permeation units.

There is provided a graphene-based membrane where the mechanical properties, thermal conductivity, electrical conductivity, and/or three-dimensional curvature of the membrane have been tuned according to the desired application of the membrane. Methods of accelerating the vacuum-assisted self-assembly (VASA) process for graphene-based membranes and methods for accelerating the process of removing liquid from a graphene-based dispersion are also provided. The method can include two steps of reduction to both minimize the filtration time and to substantially restore the electrical and thermal properties of a graphene-based membrane at low temperature.

This invention relates to membranes that can be used to remove solutes from organic solutions. The invention also relates to methods of using said membranes and the use of said membranes to filter organic solutions. The membranes are thin graphene oxide (GO) laminate membranes.

Disclosed is an ion-exchange membrane that includes a molecular barrier for influencing permeation selectivity through the membrane. The membrane includes fluorinated carbon backbone chains and fluorinated side chains that extend off of the fluorinated carbon backbone chains. The fluorinated side chains include acid groups for ionic conductivity. The acid groups surround and define permeable domains that are free of the fluorinated carbon backbone chains. Molecular barriers are located in the permeable domains and influence permeability through the domains.

A lithium ion conducting membrane and methods of making the same. The membrane includes a polymeric matrix and a plurality of ion-conducting particles disposed within the polymeric matrix. An inorganic coating deposited in the polymeric matrix.

Described herein is a graphene material-based membrane that provides selective resistance for solutes or gas while providing water permeability. A selectively permeable membrane comprising graphene oxide, reduced graphene oxide, and also functionalized or crosslinked between the graphene, that provides enhanced salt separation from water or gas permeability resistance, methods for making such membranes, and methods of using the membranes for dehydrating or removing solutes from water are also described.

Described herein is a graphene and polyvinyl alcohol based multilayer composite membrane that provides selective resistance for solutes to pass through the membrane while providing water permeability. A selectively permeable membrane comprising a crosslinked graphene with a polyvinyl alcohol and an additive that can provide enhanced salt separation from water, methods for making such membranes, and methods of using the membranes for dehydrating or removing solutes from water are also described.

A method of preparing a graphene-based membrane is provided. The method may include providing a stacked arrangement of layers of a graphene-based material, wherein the layers of the graphene-based material define one or more nanochannels between neighboring layers, and varying an electrical charge on a surface of the layers of the graphene-based material defining the one or more nanochannels to control size selectivity and/or ionic selectivity of the graphene-based membrane. A graphene-based membrane and a method of separating ions from a fluid stream are also provided.

The two-dimensional metal carbide desalination membrane includes a stack of two-dimensional metal carbide layers. A two-dimensional metal carbide included in the two-dimensional metal carbide layers may have the formula Ti.sub.3C.sub.2T.sub.x, where T represents a terminating functional group, and x represents a number of the terminating functional groups. The terminating group may be oxygen, hydroxide (OH), fluorine or combinations thereof. The two-dimensional metal carbide desalination membrane includes nano-channels which are selectively permeable to ions. The two-dimensional metal carbide desalination membrane is selectivity permeable to a number of different cations, including Li.sup.+, Na.sup.+, K.sup.+, Mg.sup.2+, Ca.sup.2+, Ni.sup.2+ and Al.sup.3+, with counter Cl.sup. anions. Permeation rates depend on the charges of the cations and the ions' hydrated radius, with a critical point around 4.0 . The two-dimensional metal carbide desalination membranes can be used as desalination and/or water filtration membranes.