Embodiments of the present invention provide for anion exchange membranes and processes for their manufacture. The anion exchange membranes described herein are made the polymerization product of at least one functional monomer comprising a tertiary amine which is reacted with a quaternizing agent in the polymerization process.

The present invention provides an intrinsically anti-microbial hollow fiber membrane for filtration of liquids. The membrane comprises a plurality of porous hollow bilayer membrane fibers wherein the liquid enters from outside of the fiber, passing through the porous membrane into the lumen of the fiber and coming out from the hollow ending of the fiber, wherein this configuration provides a liquid outside-in arrangement and retains the filtrate outside. It means that membrane of the invention has built in characteristics to act against microbes in order to provide the use with a safe liquid free from microbes. The outer side or outer wall of the hollow fibers may be configured to become hydrophobic whereas inner side or inner wall of the hollow fiber membrane may be configured to become hydrophilic to enhance the water permeability to a great extent. The hollow fiber membrane may be configured to give it an intrinsic anti-microbial capability. A device containing above said membrane has also been disclosed.

Provided is a composition for forming a separation membrane active layer, the composition comprising a compound of the following Chemical Formula 1 and a compound of the following Chemical Formula 2, wherein a percentage (a/b) of a weight (a) of the compound of Chemical Formula 1 to a weight (b) of the compound of Chemical Formula 2 is 30% to 60%, and a pH thereof is 11 to 12.7:

##STR00001## wherein in Chemical Formulae 1 and 2: R1 to R16 are each independently —CRR′— or —NR″—. at least two of R1 to R10 are —NR″—; at least two of R11 to R16 are —NR″—; and R, R′, and R″ are each independently hydrogen or a substituted or unsubstituted alkyl group; a method for producing a separation membrane; a separation membrane; and a water treatment module.

The present disclosure provides an ion-exchange membrane that includes a supporting substrate impregnated with an ion-exchange material. The supporting substrate includes an imprinted non-woven layer, and the imprinting includes a plurality of deformations at a surface density of at least 16 per cm.sup.2. The supporting substrate may lack a reinforcing layer. In some examples, the supporting substrate may include only a single layer of the imprinted non-woven fabric.

Purification devices and methods remove perfluorinated compounds (PFCs) from PFC-contaminated water using temperature swing adsorption and desorption.

Photocurable (meth)acrylate compositions for forming features on the surfaces of membranes, and particularly, on membranes used in osmosis and reverse-osmosis applications, such as membrane filters.

Embodiments include nanofilms comprising the reaction product of a natural building block type A including at least two functional groups and a natural building block type B including at least three functional groups, wherein the natural building block type A and the natural building block type B react to form a branched polymer network including solvent-resistant bonds.

This forward-osmosis composite hollow fiber membrane module has hollow fiber bundles, wherein: the hollow fibers are each such that a separation active layer of a high-molecular polymer thin film is provided on the inner surface of a macroporous hollow fiber support film formed from a high-molecular polymer including polyketone; the film surface area of the hollow fiber bundles is 100 cm.sup.2 or greater; and the coefficient of variation of the average thickness of the separation active layer in the radial and thickness directions of the hollow fiber bundle is 0-60%, said coefficient being calculated through a method for measuring the mass of the separation active layer portion in a scanning electron microscope image in which a thickness-direction cross section of the separation active layer is imaged.

Apparatuses and methods for fabricating thin film composite hollow fiber membranes. In some implementations, an apparatus is used to remove excess first solution from a hollow fiber that has been immersed in a first solution. In some implementations, the method and apparatuses include flowing a gas, for example, compressed gas or ambient air, past a surface of a hollow fiber that has been immersed in a first solution prior to immersion in a second solution. In some implementations, the gas is flowed past the surface under positive pressure, while in other implementations the gas is flowed under negative pressure, for example, vacuum. The apparatuses and devices can be used to produce thin film composite hollow fiber membranes without pressing or damaging the hollow fiber.

Disclosed are a MWW/DDR type gas separation membrane comprising at least one MWW type zeolite and at least one DDR type zeolite and a method for preparing the same. One of the MWW type zeolite and the DDR type zeolite is disposed on the other thereof, wherein at least one of the MWW type zeolite and the DDR type zeolite is epitaxially grown. In the gas separation membrane, the DDR type zeolite is epitaxially grown from the MWW type zeolite, or the MWW type zeolite is epitaxially grown from the DDR type zeolite. Thus, the MWW/DDR type gas separation membrane is synthesized using a structural continuity of the MWW type zeolite and the DDR type zeolite. Thus, the gas separation membrane has excellent separation efficiency.