A method for making a membrane includes buffing a first set of graphene platelets onto a surface of a porous substrate to force the graphene platelets into the pores of the substrate, to yield a primed substrate. The method further includes applying a fluid to the primed substrate. The method further includes forcing the fluid through the primed substrate while retaining at least a first portion of the graphene platelets of the first set on the substrate within the pores, to yield a graphene membrane comprising the substrate and a graphene layer platelets lodged within the pores of the substrate.

A filtration membrane, suitably for water filtration, in which the membrane includes a porous substrate layer and an active layer arranged over at least a part of the substrate layer. The active layer has a lamellar structure comprising at least two layers of two-dimensional material. The two-dimensional material comprises transition metal dichalcogenide. There is also provided methods for making the filtration membranes and compositions for use in those methods.

This invention relates to membranes of two dimensional material and their uses in filtration. The membranes may include polyaromatic molecules which provide a improvement in the rejection observed for small solutes. The two dimensional material may be a transition metal dichalcogenide (TMDC) or hexagonal boron nitride (hBN).

The present invention belongs to the membrane separation area, which provides an MXene material based composite nanofiltration membrane and corresponding method. The mentioned membrane is flat membrane, which has supporting layer and functional separation layer and supporting layer is under the functional separation layer. The functional separation layer is a kind of dense ultra-thin layer, no more than 50 m, prepared with MXene and crosslinking agent. This invention is about a flat composite nanofiltration membrane which has excellent separation performance, thermal resistance and chemical stability because of the novel MXene in the functional separation layer. It can be used in the treatment of the waste water with heavy metal ions, organic solvents or other highly oxidizing solution.

The present disclosure relates to a graphene filter module for water treatment including a graphene filter layer.

A method for preparation of conductive polymer/carbon nanotube (CNT) composite nanofiltration (NF) membrane and the use thereof. This conductive polymer/CNT composite NF membrane is obtained by polymerizing conductive polymer into a CNT membrane and then in-situ cross-linking with glutaraldehyde under acidic condition. The synthetic method for the conductive polymer/CNT composite NF membrane is simple and has no need of expensive equipment. The prepared membrane has controllable membrane structure and possesses superior electrical conductivity and electrochemical stability. The membrane can couple with electrochemistry for electrically assisted filtration. With the electrical assistance, the membrane can achieve improved ion rejection performance while retaining high permeability by enhancement of membrane surface charge density, which alleviates the permeability-selectivity trade-off. Furthermore, the electrically assisted NF membrane filtration can also enhance the removal for small molecular organic pollutants.

A filtration membrane, suitably for water filtration, comprising a porous substrate layer and an active layer arranged over at least a part of the substrate layer. The active layer has a lamellar structure comprising at least two layers of two-dimensional material. The two-dimensional material comprises graphene or a derivative thereof. There is also provided a method for producing filtration membranes and filtration devices containing the filtration membranes.

The present disclosure provides compositions comprising anisotropic chain-like silica nanoparticles functionalized with hydrophilic groups. The anisotropic chain-like silica nanoparticles comprise linked arrays of charged silica nanoparticles, each linked array have at least one linear dimension of from about 100 nm to about 1200 nm and the anisotropic chain-like silica nanoparticles each in have a diameter of from about 10 nm to about 500 nm. These compositions are superoleophobic in the presence of water, e.g., when submerged in water. Also provided are layered coatings comprising these compositions, substrates comprising the layered coatings, articles comprising the layered coatings, methods of filtering a mixture of water and an oil using the compositions described herein, and methods of preparing a superoleophobic coating on a substrate using the compositions described herein.

Embodiments described herein relate generally to graphene oxide membranes for fluid filtration and more specifically to graphene oxide membranes having tunable permeability, rejection rate, and flux. Some embodiments of the graphene oxide membranes disclosed herein are characterized as having a flux of at least about 2.510.sup.4 gallons per square foot per day per psi with a 1 wt % lactose solution at room temperature, and a lactose rejection rate of at least 50% with a 1 wt % lactose solution.

Embodiments described herein relate generally to durable graphene oxide membranes for fluid filtration. For example, the graphene oxide membranes can be durable under high temperatures non-neutral pH, and/or high pressures. One aspect of the present disclosure relates to a filtration apparatus comprising: a support substrate, and a graphene oxide membrane disposed on the support substrate. The graphene oxide membrane has a first lactose rejection rate of at least 50% with a first 1 wt % lactose solution at room temperature. The graphene oxide membrane has a second lactose rejection rate of at least 50% with a second 1 wt % lactose solution at room temperature after the graphene oxide membrane is contacted with a solution that is at least 80 C. for a period of time.