There is provided a zeolite membrane which is an MFI-type zeolite membrane formed on an inorganic oxide porous substrate, in which, in a diffraction pattern obtained by X-ray diffraction measurement using a CuK ray as an X-ray source, when an intensity of a diffraction peak appearing at diffraction angles of 7.3 to 8.4 at which a crystal lattice plane belongs to 011 and/or 101 planes is used as a reference, an intensity of a diffraction peak appearing at diffraction angles of 8.4 to 9.0 at which a crystal lattice plane belongs to 200 and/or 020 planes is preferably 0.3 or more.

There is provided a method of producing a separation membrane in which a zeolite membrane is formed on an inorganic oxide porous substrate. The substrate has amorphous SiO.sub.2 as a main component of a zeolite formation portion of the substrate, the method includes: a first step of forming a zeolite seed crystal and an alkaline component including a structure directing agent on a surface of the substrate; and a second step of treating a formed product obtained in the first step under a heated steam atmosphere, and the zeolite membrane is formed on the surface of the substrate.

The present invention relates to a method for manufacturing a water treatment separation membrane, the method including: forming an aqueous solution layer including an amine compound on a porous support; and bringing an organic solution including an acyl halide compound into contact with on the aqueous solution layer to form a polyamide active layer, in which the organic solution includes a non-polar solvent and an amphiphilic solvent having a boiling point of 120 C. or more, thereby improving a permeation flux, and a water treatment separation membrane manufactured by the manufacturing method.

A method for preparing a thin or thick film, including the aligning non-spherical seed crystals on a flat portion of at least one surface of the substrate such that an a-axis, a b-axis, and/or a c-axis are oriented according to a certain rule; and exposing the aligned seed crystals to a solution for enabling the growth of the seed crystals to thereby form and grow a film from the seed crystals using a secondary growing technique.

A process for separating carbon dioxide from acetylene utilizes a CHA-type zeolite membrane.

Provided in one embodiment is filtering article, comprising: powders comprising bundles of nanotubes, each bundle comprising hollow titania nanotubes. Embodiments of the methods of making and using the filtering articles are also provided.

A selectively permeable membrane for separating carbon dioxide from methane in a gaseous stream, the membrane comprising a carbonization product of a sulfonated poly(phenylene ether) copolymer, wherein the membrane has: a carbon dioxide permeability of at least 60?10.sup.?6 cm.sup.3 (STP)/cm.sup.2.Math.s cm Hg; a selectivity for carbon dioxide to methane of greater than 40, as measured at 50? C. and 791 kPa; a methane slip of less than 0.6 vol %, based on total volume of methane input; a carbon dioxide recovery of greater than 75%; and a power consumption to produce a purified gaseous stream that is equivalent to less than 90 kJ/kg of natural gas in the purified gaseous stream, preferably, wherein the membrane further has a carbon footprint that is less than 75% of a carbon footprint of a comparable membrane that does not comprise the carbonization product of the sulfonated poly(phenylene ether) copolymer.

A coated, thin-film composite membrane includes a porous support and a polyamide barrier layer in contact with the porous support. A fouling-resistant and antimicrobial layer of star polymers is in contact with the polyamide barrier layer. The star polymers included hydrophilic arms of about 40 mol % to about 80 mol % of neutral hydrophilic moieties, and about 60 mol % to about 20 mol % of antimicrobial functional groups.

A coated, thin-film composite membrane includes a porous support and a polyamide barrier layer in contact with the porous support. A fouling-resistant and antimicrobial layer of star polymers is in contact with the polyamide barrier layer. The star polymers included hydrophilic arms of about 40 mol % to about 80 mol % of neutral hydrophilic moieties, and about 60 mol % to about 20 mol % of antimicrobial functional groups.

Provided in one embodiment is a filtering article, comprising: powders comprising bundles of nanotubes, each bundle comprising hollow titania nanotubes. Embodiments of the methods of making and using the filtering articles are also provided.