A nanostructured composite membrane filter for rapid water purification and methods for preparing the nanostructured composite membrane filter are provided. The nanostructured composite membrane includes a silver layer having a plurality of silver functionalized nanofibers for disinfecting microorganisms of water, and a chemical modified layer having a plurality of chemical modified nanofibers for removing impurities from the water. The plurality of silver functionalized nanofibers includes a plurality of polyvinyl alcohol (PVA) nanofibers coated with polydopamine (PDA) and silver, and each of the plurality of chemical modified nanofibers includes a polymer matrix such as polyvinyl alcohol (PVA) and anionic polyelectrolytes such as poly (sodium styrenesulfonate) (PSSNa) for capturing metal ions of the water.

A nanostructured composite membrane filter for rapid water purification and methods for preparing the nanostructured composite membrane filter are provided. The nanostructured composite membrane includes a silver layer having a plurality of silver functionalized nanofibers for disinfecting microorganisms of water, and a chemical modified layer having a plurality of chemical modified nanofibers for removing impurities from the water. The plurality of silver functionalized nanofibers includes a plurality of polyvinyl alcohol (PVA) nanofibers coated with polydopamine (PDA) and silver, and each of the plurality of chemical modified nanofibers includes a polymer matrix such as polyvinyl alcohol (PVA) and anionic polyelectrolytes such as poly (sodium styrenesulfonate) (PSSNa) for capturing metal ions of the water.

Disclosed herein is a gas separation membrane comprising a furan-based polymer, an apparatus comprising the gas separation membrane, and a process for separating a mixture of gases using said gas separation membrane. The process comprises contacting one side of a gas separation membrane comprising a furan-based polymer with a mixture of gases having different gas permeances, whereby at least one gas from the mixture of gases permeates preferentially across the gas separation membrane, thereby separating the at least one gas from the mixture of gases.

The present inventive concept relates to a chemically modified anion exchange membrane and a method of preparing the same and, more particularly, an anion exchange membrane in which sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane are substituted with anion conductive groups such as ammonium group, phosphonium group, imidazolium group, pyridinium group and sulfonium group, and a method of preparing an anion exchange membrane by chemically modifying sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane.

The present inventive concept relates to a chemically modified anion exchange membrane and a method of preparing the same and, more particularly, an anion exchange membrane in which sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane are substituted with anion conductive groups such as ammonium group, phosphonium group, imidazolium group, pyridinium group and sulfonium group, and a method of preparing an anion exchange membrane by chemically modifying sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane.

A filtering device for obtaining a chemical liquid by purifying a liquid to be purified has an inlet portion, an outlet portion, a filter A, at least one filter B different from the filter A, and a flow path which includes the filter A and the filter B arranged in series between the inlet portion and the outlet portion and extends from the inlet portion to the outlet portion, in which the filter A has a porous base material made of polyfluorocarbon and a coating layer which is disposed to cover the porous base material and contains a first resin having a hydrophilic group.

Methods of making blended, isoporous, asymmetric (graded) films (e.g. ultrafiltration membranes) comprising two or more chemically distinct block copolymers and blended, isoporous, asymmetric (graded) films (e.g. ultrafiltration membranes) comprising two or more chemically distinct block copolymers. The generation of blended membranes by mixing two chemically distinct block copolymers in the casting solution demonstrates a pathway to advanced asymmetric block copolymer derived films, which can be used as ultrafiltration membranes, in which different pore surface chemistries and associated functionalities can be integrated into a single membrane via standard membrane fabrication, i.e. without requiring laborious post-fabrication modification steps. The block copolymers may be diblock, triblock and/or multiblock mixes and some block copolymers in the mix may be functionally modified. Triblock copolymers comprising a reactive group (e.g., sulfhydryl group) terminated block and films comprising the triblock copolymers.

Methods of making blended, isoporous, asymmetric (graded) films (e.g. ultrafiltration membranes) comprising two or more chemically distinct block copolymers and blended, isoporous, asymmetric (graded) films (e.g. ultrafiltration membranes) comprising two or more chemically distinct block copolymers. The generation of blended membranes by mixing two chemically distinct block copolymers in the casting solution demonstrates a pathway to advanced asymmetric block copolymer derived films, which can be used as ultrafiltration membranes, in which different pore surface chemistries and associated functionalities can be integrated into a single membrane via standard membrane fabrication, i.e. without requiring laborious post-fabrication modification steps. The block copolymers may be diblock, triblock and/or multiblock mixes and some block copolymers in the mix may be functionally modified. Triblock copolymers comprising a reactive group (e.g., sulfhydryl group) terminated block and films comprising the triblock copolymers.

The present invention provides a nonwoven fabric for a separation membrane which can prevent a bleed-through of a resin solution used for coating in a step of producing the separation membrane, can produce a separation membrane having a large permeate flux of a liquid by non-solvent induced phase separation, has high adhesiveness between a coating membrane and the nonwoven fabric, and can make the coating membrane thin, and a method of producing the same. In an exemplary aspect of the present invention, a two-layer nonwoven fabric 10 for a separation membrane is configured to have a surface layer 11 and a back surface layer 12, a coating surface of a coating solution during membrane formation is a surface 11a of the surface layer 11, and, when the nonwoven fabric 10 is impregnated with the coating solution for membrane formation, the surface layer 11 has a large Laplace force and the back surface layer 12 has a small Laplace force. The nonwoven fabric 10 for a separation membrane can be produced by sequentially papermaking a fiber dispersion liquid DS1 for a surface layer including one or more kinds of fine fibers FF having a small fiber diameter and one or more kinds of thick fibers TF having a fiber diameter larger than that of the fine fibers FF and a fiber dispersion liquid DS2 for a back surface layer consisting of the thick fibers TF using a wet papermaking method.

The present invention relates to a chemically modified anion exchange membrane and a method of preparing the same and, more particularly, an anion exchange membrane in which sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane are substituted with anion conductive groups such as ammonium group, phosphonium group, imidazolium group, pyridinium group and sulfonium group, and a method of preparing an anion exchange membrane by chemically modifying sulfonic acid groups in a perfluorinated sulfonic acid electrolyte membrane.