Advanced Membranes for RO Performance

Composite gas separation membrane with improved stability for separating organic waste gases like volatile organic compounds (VOCs) from air. The membrane has a support membrane and a polymer liquid hybrid membrane containing a filling liquid confined in a network of organic polymer. This prevents the filling liquid from being carried away by the gas stream during separation, unlike conventional liquid membranes. The organic polymer provides a barrier to retain the filling liquid and improve membrane stability. The composite membrane can separate VOCs from air with higher selectivity and stability compared to plain liquid membranes.

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A CO2 separation membrane with improved selectivity and permeability compared to existing membranes. The membrane has a base membrane with a selective layer made of a polyionic liquid. The polyionic liquid contains specific structural units: -NH2, -C(=NH)CH2, and -CH2C(=O)CH2-C(=O)NH-. This composition allows tuning of the CO2 separation properties. The polyionic liquid has high CO2 adsorption and selectivity due to the NH2 group and specific structural units.

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A method for preparing a high-performance gas separation membrane using two-dimensional MXene nanomaterials. The method involves mixing MXene nanosheet solution with polymer solutions like PEGMEA and Pebax, along with a cross-linking agent. The mixture undergoes cross-linking to form the MXene-polymer composite membrane. The MXene nanosheets disperse uniformly in the polymer matrix, enhancing gas separation properties due to the MXene's high CO2 selectivity and the polymer's open structure.

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Preparing a mixed matrix membrane that can be used for preparing the CO 2 Permeability and CO 2 /N 2 The selectivity is excellent, and thus has improved separation performance and separation efficiency. The membrane comprises polymer matrix solution and Mo 132 The inorganic high-nuclear metal cluster has the size of about 3 nanometers, and can be well dissolved in water, so that the molecular level doping in the true sense is realized, and the problem that the interface compatibility of the filler and the polymer matrix is poor, so that interface defects are generated and the gas separation performance is influenced is effectively solved.

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Reverse osmosis membrane with high durability and desalination performance. The membrane has a polyamide layer followed by a zeolite layer on top. The zeolite layer provides protection against chemical degradation of the polyamide layer during desalination. The zeolite layer can be formed by attaching zeolite seeds to the polyamide surface and then growing the zeolite in a solution containing lower concentrations of alkali ions compared to traditional methods. This allows higher zeolite deposition rates and prevents polyamide degradation.

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Mixed matrix membrane for gas separation with improved CO2 selectivity and permeability compared to conventional polymer membranes. The mixed matrix membrane comprises a polymer matrix with amino acid intercalated hydrotalcite nanoparticles dispersed within it. The amino acid intercalation modifies the hydrotalcite filler to have amino functional groups that increase CO2 affinity. This improves CO2 selectivity and permeability when incorporated into the polymer matrix for gas separation applications.

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Gas separation membranes containing heterogeneous silica nanoparticles with improved gas separation performance. The membranes have heterogeneous silica nanoparticles with elongated shapes and rough surfaces, dispersed in a polymer matrix. The silica nanoparticles are treated with hyperbranched or dendritic polymers to prevent aggregation. This enhances gas permeability without reducing membrane strength. The silica nanoparticles have particle diameters measured by dynamic light scattering larger than those measured by nitrogen adsorption, indicating elongated shapes. The rough surfaces have higher specific surface areas compared to smooth spherical nanoparticles.

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High-performance gas separation membranes for oxygen and nitrogen enrichment using a polyetherimide mixed matrix membrane with polyimide microsphere filler. The polyetherimide-based mixed matrix membrane has improved gas permeability and selectivity compared to pure polyetherimide membranes. The microsphere filler provides dispersion and adjustable channel structure. The polyimide microsphere filler has a general structural formula and is synthesized. The mixed matrix membrane is prepared by doping the polyimide microsphere filler into the polyetherimide film. The resulting membrane has high oxygen and nitrogen permeability with selectivity above the upper limit for traditional membranes.

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Composite semipermeable membrane for desalination and water generation with improved performance compared to conventional membranes. The membrane has a unique pleated structure with protrusions in the separation layer. This structure increases the actual thickness of the thin film and surface area of protrusions, allowing higher water flux and salt rejection compared to flat membranes. The protrusions have specific height and angle distributions. The membrane is formed by interfacial polycondensation of polyfunctional amine and acid halide solutions. The compound (I) used in the polycondensation moderates the amine concentration gradient during film formation, leading to protrusion growth and thicker thin films.

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Mixed matrix membrane using bifunctional modified graphene oxide (GO) sheets for improved gas separation performance. The mixed matrix membrane is prepared by blending bifunctional modified GO nanosheets with a polymer matrix like Pebax. The bifunctional modification involves growing iron nanoparticles on the GO sheets. This provides cooperative gas transport channels in the polymer matrix that improve gas separation beyond the trade-off limit of the polymer matrix alone. The iron nanoparticles enhance gas permeability while the GO sheets improve selectivity.

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Composite nanofiltration membrane for water treatment with improved selectivity and fouling resistance. The membrane is based on a covalent organic framework complex (COF) called NCOF. The NCOF nanoparticles are dispersed in the polyamide skin layer of the membrane during preparation. This modification enhances the membrane's permselectivity and antifouling properties compared to traditional polyamide nanofiltration membranes. The COF nanoparticles have uniform pore size and hydrophilic groups that improve separation efficiency and prevent fouling.

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Preparation of a ZRT mixed matrix membrane for gas separation applications using a trimeric coordination zirconocene compound called ZRT and a high molecular polymer. The ZRT is mixed with the polymer to create a film that can separate gases like CO2 and CH4 better than traditional membranes. The ZRT molecule has a unique structure and solubility that allows it to disperse in the polymer matrix without agglomeration. This improves compatibility and uniformity of the mixed matrix film compared to using insoluble metal-organic frameworks. The resulting ZRT mixed matrix membrane has enhanced gas separation performance.

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Composite polymer membrane for gas separation with improved selectivity and permeability compared to conventional composite membranes. The key is using metal-organic framework (MOF) nanoparticles with controlled defects dispersed in the polymer matrix. The controlled defects are induced by adding a monocarboxylic acid compound during MOF synthesis. This enhances the composite membrane's gas separation performance without sacrificing selectivity. The MOF nanoparticle concentration is fixed at 20 wt% and the defect-inducing monocarboxylic acid compound amount is optimized. The composite membrane shows improved gas permeability and selectivity compared to using regular MOF nanoparticles. The controlled defects likely provide additional gas transport pathways through the MOF matrix.

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A mixed matrix membrane with improved gas separation performance compared to existing mixed matrix membranes. The membrane comprises a high molecular polymer and a specific porous metal-organic cage complex called ZRT-1-4F. The ZRT-1-4F provides better separation properties when incorporated into the polymer matrix. The ZRT-1-4F has uniform dispersion and compatibility in the polymer, preventing agglomeration and improving interfacial contact. This leads to higher separation performance of the mixed matrix membrane compared to traditional mixed matrix membranes using insoluble metal-organic frameworks.

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A hybrid membrane for gas separation that improves performance and stability for sour gas applications. The membrane is made by blending a polyether-block-amide (PEBA) polymer with functionalized polyhedral oligomeric silsesquioxane (POSS) nanoparticles. After forming the membrane, crosslinking is done using UV light to connect the POSS particles in the PEBA matrix. This provides enhanced separation selectivity, durability, and resistance to plasticization compared to PEBA membranes alone.

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Hollow fiber composite membrane for gas separation with improved permeability and selectivity. The membrane has a polyamide layer on the inner surface of the hollow fiber support, containing a microporous inorganic filler encapsulated with polydopamine. The encapsulated filler improves gas separation performance compared to traditional membranes. The filler is prepared by mixing polydopamine with a titanosilicate, then forming the composite layer on the fiber by interfacial polymerization.

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Amphiphilic copolymer with improved gas separation performance for polyethylene oxide (PEO)-based membranes. The copolymer has hydrophobic polydimethylsiloxane (PDMS) segments at the ends of the hydrophilic polyethylene glycol (PEG) segments. This copolymer forms micelles that fill the spaces between crystalline PEO spherulites. When mixed with PEO solution, the micelles prevent defects and improve gas separation performance by reducing crystallinity and gaps between PEO spheroids.

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High pressure filtration membranes for applications like reverse osmosis that can withstand high pressures without collapsing. The membranes contain a porous layer made of a specific combination of aromatic sulfone polymer and polyphenylene polymer. The membranes are produced by casting a composition containing the polymers and a solvent, then solidifying it. The membranes can be used to filter fluids like saltwater at high pressures without collapsing due to the unique polymer combination.

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Carbon dioxide separation membrane with high selectivity and high permeability for capturing CO2 from industrial processes and reducing greenhouse gas emissions. The membrane has multiple layers: a support layer, a nanoparticle composite layer, and a polymer layer. The nanoparticle composite layer contains nanoparticles like graphene and modified zeolite molecular sieves dispersed in a first polymer. The nanoparticle modification enhances CO2 selectivity. The membrane has CO2 permeability over 3400 Barrer and CO2/N2 selectivity over 45. The high CO2 capture efficiency makes it useful for CO2 separation applications like carbon capture, utilization, and storage (CCUS) to reduce emissions from power plants and industrial processes.

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A composite membrane for water treatment that has high efficiency in removing small organic molecules like pollutants while maintaining water flux. The membrane consists of a porous support layer and a dense separation layer. The support layer is made of hollow fiber ultrafiltration membrane. The separation layer is coated onto the support layer using a crosslinking agent. The crosslinking agent contains nanocellulose to strengthen the separation layer. Heat treatment crosslinks the nanocellulose to create a stable composite membrane. The composite membrane shows high rejection of small organic compounds like Congo red, methyl blue, bisphenol A, floxacin, indomethacin, and diclofenac while maintaining good water flux.

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