Membranes, methods of making the membranes, and methods of using the membranes are described herein. The membranes can comprise a support layer, and a selective polymer layer disposed on the support layer. In some cases, the support layer can comprise a gas permeable polymer and hydrophilic additive dispersed within the gas permeable polymer. In some cases, the selective polymer layer can comprise a selective polymer matrix and carbon nanotubes dispersed within the selective polymer matrix. The membranes can exhibit selective permeability to gases. As such, the membranes can be for the selective removal of carbon dioxide and/or hydrogen sulfide from hydrogen and/or nitrogen.

A polyvinylidene fluoride (PVDF) casting membrane solution is shaped as a flat sheet membrane by thermally induced phase separation (TIPS), the PVDF membrane is defluorinated with an alkaline potassium permanganate solution, and then the carbon chain is extended with glycidyl methacrylate (GMA) as the graft monomer, and finally the nucleophilic substitution is carried out between melamine and GMA to produce a chelating microfiltration membrane for capturing and enriching heavy metals with high flux and high capacity.

A hollow fiber membrane of the present invention is a hollow fiber membrane having an outer surface and an inner surface, wherein the inner surface has a zebra stripe pattern in which dense portions and porous portions are alternately formed in the longitudinal direction, and the outer surface has a maximum pore size of about 1 m or less (about 1 m), and wherein the hollow fiber membrane has a water permeability (flux) of about 1,300 LMH/bar to about 5,000 LMH/bar.

The problem addressed by the present invention is to provide a separation membrane with superior permeation performance and separation performance and having few occurrences of defects. The present invention relates to a separation membrane wherein: the separation membrane has a layer (I) with a thickness of 0.5-100 m; letting, in a cross-section in the direction of thickness of the layer (I), region a be a region with a depth of 50-150 nm from a surface (surface A), region b a region with a depth of 50-150 nm from the other surface (surface B), and region c a region with a thickness of 100 nm where the depth from both surfaces is the same, the average pore diameter Pa for region a and the average pore diameter Pb for region b are both 0.3-3.0 nm and the average pore diameter Pc for region c is 3.0 nm or less; and the percentage of open area Ha for region a, the percentage of open area Hb for region b, and the percentage of open area Hc for region c satisfy the following equations. 2Hc<Ha 2Hc<Hb

The invention relates to the providing of hydrophobic and hydrophilic polymer-based hollow fiber membranes containing a water-insoluble antioxidant; in particular, the invention relates to the providing of hollow fiber membranes for the extracorporeal treatment of blood, wherein the hollow fiber membranes have improved biocompatibility relative to treatment blood, in particular improved complement activation and lower platelet loss vis--vis treatment blood. At the same time, the elution of hydrophilic polymers from the lumen of the hollow fiber membrane is reduced.

Membranes, methods of making the membranes, and methods of using the membranes are described herein. The membranes can comprise a support layer, and a selective polymer layer disposed on the support layer. In some cases, the support layer can comprise a gas permeable polymer and hydrophilic additive dispersed within the gas permeable polymer. In some cases, the selective polymer layer can comprise a selective polymer matrix and carbon nanotubes dispersed within the selective polymer matrix. The membranes can exhibit selective permeability to gases. As such, the membranes can be for the selective removal of carbon dioxide and/or hydrogen sulfide from hydrogen and/or nitrogen.

In the production of a polyphenylsulfone porous hollow fiber membrane by a wet spinning method or a dry-wet spinning method using a spinning dope comprising a water-soluble organic solvent solution of polyphenylsulfone, hydrophilic polyvinylpyrrolidone, and ethylene glycol, wherein N,N-dimethylformamide with a concentration of 70 to 100 wt. %, preferably 85 to 100 wt. %, more preferably 100 wt. %, is used as a core liquid. The resulting porous hollow fiber membrane enables stable production without imposing burdens on the environment and provides a water purification membrane having high water permeability and excellent filtration performance.

The present disclosure relates to the field of materials for uranium extraction from seawater (UES), and in particular, to a photothermal photocatalytic membrane for seawater desalination and uranium extraction and a preparation method therefor. The present disclosure provides a photothermal photocatalytic membrane for seawater desalination and uranium extraction and a preparation method therefor. The preparation method includes: fixing a treated carbon cloth to a glass plate, pouring a casting solution 1 onto the carbon cloth to form a first layer of film, forming a second layer of film using a casting solution 2, and putting the second layer of film into a first coagulation bath and a second coagulation bath in sequence to form the photothermal photocatalytic membrane. The photothermal photocatalytic membrane is supported by the carbon cloth, and a surface of the photothermal photocatalytic membrane is of a micro-nano structure.

A method for manufacturing a filter membrane for inhibiting microorganisms includes the following steps: obtaining a nano-zinc precursor and dissolving it into water, adding at least one reducing agent and interfacial agent to the water, thereby reducing zinc ions of the nano-zinc precursor to zinc particles so as to form liquid having nano-zinc particles; respectively placing the liquid having nano-zinc particles and a polymer material into plastic masterbatch process equipment, respectively volatilizing the fluid having nano-zinc particles and polymer material through the plastic masterbatch process equipment, performing air extraction and mixing by the plastic masterbatch process equipment, and adding at least one grafting agent to perform a mixed graft link, allowing the nano-zinc particles and polymer material to be linked together stably so as to form a plastic masterbatch having nano-zinc particles; and making the plastic masterbatch into a filer membrane through film making equipment.

A method for manufacturing a hollow fiber membrane wherein a spinning stock solution containing 10 mass % or more and 40 mass % or less of a polysulfone-based resin, 1 mass % or more and 30 mass % or less of polyvinylpyrrolidone, and 1 mass % or more and 80 mass % or less of N,N-dimethylformamide is discharged together with a core liquid from a double-ring nozzle to produce a hollow fiber membrane by dry-wet spinning, and then the hollow fiber membrane is subjected to a dry heat treatment at a temperature of 80? C. or higher and 100? C. or lower for 48 hours or longer and 168 hours or shorter.