A composite palladium-based alloy material, a preparation method therefor, and a use thereof are provided. The composite palladium-based alloy material includes Pd and a group IB metal. In an XRD graph of the composite palladium-based alloy material, the full width at half maximum of at least one characteristic peak for 2 within the range of 5-90 is less than or equal to 0.1745. The composite palladium-based alloy material has a lower activation energy for hydrogen permeation, a higher hydrogen permeation efficiency, higher stability and carbon deposition resistance, and has a longer service life as a composite membrane (especially in hydrogen production via steam reforming).

The precise molecular sieving architectures with Janus-like characteristics via an interpenetrating polymer network combining the hydrophilic cPI polymer and hydrophobic microporous covalent organic framework (COF) exhibit super-high permeances for both polar and nonpolar solvents. A unidirectional diffusion and convection process significantly speeds up chemically stable COFs with uniform and tailorable channels growing on polymeric hollow fibre that can efficiently separate organic solvents under ultrafiltration conditions.

A system involves interleaving high aspect ratio, rod-like aldehyde-modified cellulose nanomaterials (ACN) between graphene oxide (GO) sheets and utilizing crosslinkers to create a dense, crosslinked network that is highly permeable and selective to a molecule of interest, especially water and water vapor, and does not delaminate in water. This system, especially when combined with oxidative surface treatment of a membrane support substrate, leads to improved adhesion of the membrane on the substrate.

A necklace-type nanofiber hybrid membrane is disclosed. ZIF-67 (Zeolite imidazolate framework-67), a type of metal-organic framework (MOF), is formed surrounding surface of the nanofibers to possess a necklace-type structure. The combination of ZIF-67 and nanofibers enables simultaneous removal of fine dust and sulfides while exhibiting excellent stability.

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.