This disclosure relates to the fabrication of high-performance thin film composite (TFC) reverse osmosis (RO) membranes comprising a thin polyamide rejection layer (thickness of 100-200 nanometer), a porous substrate including polysulfone (PSf) layer (thickness of 40-50 micron) cast on polyester nonwoven fabric (thickness of 100 micron). Hydrophilic and antibacterial TFC polyamide RO membranes were developed by incorporating green Lignin and nanostructured silver-based metal organic frameworks (MOFs) into the selective layer. The polyamide layer of TFC RO membranes was fabricated on the porous PSf substrate by interfacial polymerization between aqueous monomer solutions containing MPD, and adequate additives in water and organic monomer solutions containing TMC in the mixture of hexane and co-solvents. The optimized produced RO membranes were provided water flux of 95-100 LMH and sodium chloride (NaCl) salt rejection of 98.5-99.0% during filtration of 2000 ppm NaCl solution at 225 psi pressure, and water flux of 55-60 LMH and sodium chloride (NaCl) salt rejection of 98.6-98.9% during filtration of 35000 ppm NaCl solution at 800 psi pressure. This disclosure also relates to developing a roll-to-roll PSf membrane as a substrate for making TFC RO membranes for water desalination

A gas separation membrane including a separation functional layer in at least part thereof, the gas separation membrane having a fibrous shape or film-like shape, the separation functional layer including a matrix and particles. Provided are a gas separation membrane and a gas separation membrane module capable of preventing breakage of the gas separation membrane during the operation, and allowing long-term stable production of excellent permeation and separation properties.

The present invention relates to laminate membranes for filtration of solutes. The membranes comprise graphene oxide and polyvinyl amine. The invention also relates to methods of reducing the amount of solutes in a mixture using said membranes, methods of making said membranes, and uses of said membranes.

In a method for making a nanofiltration membrane, an ultrafiltration membrane is disposed onto a support module. A plurality of interface polymerization reactants is applied to the ultrafiltration membrane. The interface polymerization reactants are reacted to form the nanofiltration membrane so that the nanofiltration membrane has a predetermined pore size. A nanofiltration membrane includes an ultrafiltration membrane. An interface polymerized nanofiltration membrane is deposited on the ultrafiltration membrane. The nanofiltration membrane has a predetermined pore size.

A mixed matrix membrane that includes polyvinylidene fluoride and TiN nanoparticles may be useful solar-driven surface heating membrane distillation. The plasmonic character of the TiN nanoparticles may locally heat the membrane when exposed to sunlight, which increases the distillation flux across the membrane. Said distillation methods may be particularly useful for treating laundry wastewater to collect distilled water with a reduced concentration of chemical oxygen demand, a reduced concentration of total dissolved solids, and a reduce conductivity. The distilled water may be repurposed for a variety of purposes including agricultural irrigation with significant less impact on the aquatic ecosystem compared to the laundry wastewater.

A system involves interleaving high aspect ratio, rod-like aldehyde-modified cellulose nanomaterials (ACN) between graphene oxide (GO) sheets and utilizing crosslinkers to create a dense, crosslinked network that is highly permeable and selective to a molecule of interest, especially water and water vapor, and does not delaminate in water. This system, especially when combined with oxidative surface treatment of a membrane support substrate, leads to improved adhesion of the membrane on the substrate.

A membrane sorbent is described, which comprises 1-6 wt % silicon carbide nanoparticles dispersed in a polymer matrix. The polymer matrix may comprise polysulfone and polyvinylpyrrolidone. The membrane sorbent is used for separating oil from a contaminated water mixture. The silicon carbide nanoparticles of the membrane sorbent may be made from rice husk ash.

The present disclosure belongs to the technical field of porous membrane material preparation, and specifically relates to a reverse osmosis composite membrane with an ultrathin desalting layer and a preparation method thereof; the intermediate layer is introduced after modifying the polysulfone base membrane, the modified polysulfone base membrane support layer may strengthen the bonding to the desalting layer through a covalent bond, and the thickness of the desalting layer is reduced to be 10 nm, so that the desalination rate of the membrane is not greatly affected while increasing the membrane flux. Compared with the membrane having a conventional thickness of the desalting layer, the water flux of the reverse osmosis composite membrane with an ultrathin desalting layer may be increased by about 0.5 times, while the desalination rate has a small change.

Embodiments of the present disclosure describe a mixed-matrix membrane (MMM), and methods of fabricating a MMM, that includes a filler and a seamless polymer matrix forming a first zone and a second zone. The density of the filler is asymmetric with a greater density of filler within the polymer matrix forming the second zone. A MMM of the present disclosure may be an integrally skinned asymmetric (ISA) MMM or a dense MMM. MMMs of the present disclosure may be utilized in numerous industries. e.g., in the field of organic solvent nanofiltration membranes (OSN), gas separation, fuel cell, battery, catalysis, sensors, pharmaceutical, food and beverages, cosmetics, and composite materials, among others.

A filtration membrane includes an alumina support; a polyamide network disposed on the alumina support and formed by polycondensation between piperazine (PIP) and isophthaloyl dichloride (IPC); and a polypyrrole-graphitic carbon nitride (PPy-G-C.sub.3N.sub.4) photocatalyst embedded in the polyamide network through covalent bonding, the PPy-G-C.sub.3N.sub.4 photocatalyst including nanosheets of graphitic carbon nitride (G-C.sub.3N.sub.4) embedded in a matrix of a polypyrrole (PPy) polymer. The membrane of the present disclosure can be used for separating oil and water.