A method of making a ceramic honeycomb article which includes: applying at least one green membrane coating layer on a green substrate, the green substrate comprising a plurality of cells comprised of a plurality of interior channels and a plurality of porous interior walls between the channels; drying the at least one green membrane coating layer on the green substrate to produce a green coated substrate; and firing the green coated substrate into a porous substrate, wherein applying the at least one green membrane coating layer and the drying the at least one green membrane coating layer are repeated from 2 to 10 times prior to firing to form multiple green membrane coating layers on the green substrate and wherein the firing the green coated substrate forms a ceramic honeycomb article comprised of the porous substrate and multiple fired coating layers on the porous substrate.

The present invention provides a semipermeable membrane having enhanced alkaline stability and a method of forming a semipermeable membrane having enhanced alkaline stability, comprising steps of: providing an ultrafiltration (UF) base membrane, immersing said UF membrane in a solution comprising at least one substance selected from the group consisting of a polymer preferably polyethylenimine (PEI), a condensate solution and a mixture thereof, thereby forming reactive moieties upon said UF membrane, and forming at least one first layer upon at least portion of said UF base support membrane by immersing said UF base support membrane of step (b) in a solution comprising at least one ingredient selected from the group consisting of polymer preferably polyethylenimine (PEI), condensate solution and a mixture thereof thereby forming a cross-linked skin on the surface of said base membrane.

A laminate is provided comprising at least one polysulfone and/or polyethersulfone porous membrane heat bonded to a polyvinylidene fluoride substrate.

A laminate is provided comprising at least one polysulfone and/or polyethersulfone porous membrane heat bonded to a polyvinylidene fluoride substrate.

Zeolite membrane sheets for separation of mixtures containing water are provided, as well as methods for making the same. Thin, but robust, zeolite membrane sheets having an inter-grown zeolite crystal film directly on a thin, less than 200 micron thick, porous support sheet free of any surface pores with a size above 10 microns. The zeolite membrane film thickness is less than about 10 microns above the support surface and less than about 5 microns below the support surface. Methods of preparing the membrane are disclosed which include coating of the support sheet surface with a seed coating solution containing the parent zeolite crystals with mean particle sizes from about 0.5 to 2.0 microns at loading of 0.05-0.5 mg/cm2 and subsequent growth of the seeded sheet in a growth reactor loaded with a growth solution over a temperature range of about 45 C. to about 120 C.

Disclosed herein are an apparatus for heat-treating an inner side surface of a braid for a hollow fiber membrane reinforcement for a water treatment and a braid for a hollow fiber membrane reinforcement manufactured using the heat-treatment apparatus, wherein a fiber tissue forming an inner side surface of a braid becomes dense, and the inner diameter of the braid can be expanded, and the circularity of the inner and outer diameters can be accurate, and a compressive strength can be increased, whereby the physical property of a reinforcement membrane of a hollow fiber can be enhanced, and a filtration reliability and water penetration can be improved, thus obtaining an increased service life of a product and an economical saving effect.

The present disclosure belongs to the technical field of membrane separation, and discloses a preparation method of a Ti.sub.3C.sub.2T.sub.x MXene quantum dot (MQD)-modified polyamide (PA) reverse osmosis (RO) membrane. The preparation method includes the following steps: subjecting a Ti.sub.3C.sub.2T.sub.x MXene material to liquid nitrogen intercalation and interlayer expansion to obtain a Ti.sub.3C.sub.2T.sub.x MQD nanomaterial; preparing an aqueous phase solution with the Ti.sub.3C.sub.2T.sub.x MQD nanomaterial and an organic phase solution; soaking an ultrafiltration (UF) base membrane in the aqueous phase solution , and removing the aqueous phase solution on a surface of the UF base membrane through blow-drying; soaking the second UF base membrane in the organic phase solution to allow interfacial polymerization to form an active layer; and allowing a composite membrane obtained after the interfacial polymerization to stand, followed by a heat treatment to further promote the interfacial polymerization.

Water-filtration compositions, membranes, devices, and manufacturing processes including graphene oxide with hydrophilic functional groups. Disclosed are a composition comprising graphene oxide with an average particle diameter of no more than about 1 ?m and has an oxygen atomic percentage of at least about 30%, a membrane comprising the composition, a water-permeable device comprising the membrane, a method of making the membrane using the composition, and several methods of generating the composition.

A separation membrane has high strength and low leakage property while maintaining high gas permeability using poly(4-methyl-1-pentene) excellent in chemical resistance and gas permeability. The separation membrane contains poly(4-methyl-1-pentene) as a main component, in which a ratio RA of a rigid amorphous of poly(4-methyl-1-pentene) in the separation membrane is 43% or more and 60% or less, a porosity is 30% or more and 70% or less, and a dense layer is provided on at least one surface.

Described herein are articles for separating gases. The article includes a selective layer consisting of a crosslinked amorphous fluorinated copolymer containing one or more types of fluorinated ring monomers, with crosslinking between the fluorinated copolymer chains. The crosslinking improves the mechanical properties of the fluoropolymer, thereby permitting use of polymer types which would otherwise be excessively brittle. The resulting crosslinked polymer membranes have superior selectivity and reliability performance compared with previous compositions known to the art. Methods for making and using the article described are also provided.