47results about How to "High separation selectivity" patented technology

The invention relates to a preparation method and application of an organosilicon / MOF-303 mixed matrix membrane, a silicon source precursor is uniformly dissolved in an ethanol solvent, then a mixture of water and hydrochloric acid is added according to a certain proportion, a water bath heating reaction is carried out for a period of time to obtain an organosilicon sol, prepared MOF-303 powder is added into the organosilicon sol according to a certain proportion, and the organosilicon / MOF-303 mixed matrix membrane is obtained. The preparation method comprises the following steps: uniformly mixing the raw materials through ultrasound to obtain a separation layer sol, coating the prepared separation layer sol on a ceramic support body through a hot coating method, and calcining in an air atmosphere for a period of time to obtain the MOF-303 / mixed matrix membrane. An organic silicon substance BTESA with a rigid acetylene bridge structure is preferably selected as a precursor, an MOF-303 material with a high specific surface area is doped into the precursor, the pore channel structure of the membrane is modified, more adsorption sites are provided for water molecules, and the composite membrane material with the optimal separation performance is obtained by optimizing the composite proportion.

The invention relates to the technical field of metal organic framework functional materials, and discloses a ZIF-8-based super-hydrophobic MOF as well as a preparation method and application thereof. The preparation method of the ZIF-8-based super-hydrophobic MOF comprises the following steps: taking 2-methylimidazole and a fluorine-containing ligand FL as a mixed ligand, and carrying out coordination reaction on the mixed ligand and Zn ions to obtain a ZIF-8-FL material; the preparation method comprises the following steps: carrying out grafting modification on a ZIF-8-FL material and a modifier under the action of an acid-binding agent, so as to obtain the ZIF-8-based super-hydrophobic MOF; wherein the modifier is alkyl acyl chloride or fluorine-containing anhydride. The ZIF-8-based super-hydrophobic MOF is prepared by introducing the mixed ligand and grafting modification, the process is simple, the cost is low, and the method is suitable for large-scale production; the ZIF-8-based super-hydrophobic MOF prepared by the invention has high chemical stability and excellent hydrophobic performance in an acid environment, and the defect that a conventional MOFs material is easy to degrade is avoided; the oil-water separator has excellent separation efficiency and selectivity in the oil-water separation process, can effectively separate oil-water mixtures in various complex systems, and has wide market application prospects and economic benefits.

The invention relates to a membrane separation method and device for separating 1, 3-butadiene from a C4 hydrocarbon mixture. According to the membrane separation method, a C4 hydrocarbon mixture is used as a raw material and is separated through an MOF membrane, and 1, 3-butadiene is obtained on the permeation side of the membrane; the C4 hydrocarbon mixture comprises 1, 3-butadiene, and further comprises one or a combination of more selected from the group consisting of n-butene, isobutene, n-butane, isobutane, cis-2-butene and trans-2-butene; and the MOF film is selected from one or a combination of more of MIL-53, Co-gallate, Al-bttotb, MIL-160, UiO-66, ZIF-7, ZIF-8 and ZIF-90, and the MOF film is selected from one or a combination of more of MIL-53, Co-gallate, Al-bttotb, MIL-160, UiO-66, ZIF-7, ZIF-8 and ZIF-90. The separation is carried out in an MOF membrane separation device, the MOF membrane separation device comprises an MOF membrane separator, and the MOF membrane separator comprises an MOF membrane assembly and the MOF membrane. According to the method, a membrane separation technology is adopted, so that high-purity 1, 3-butadiene can be efficiently obtained in a manner of increasing the productivity.

The invention belongs to the technical field of nanofiltration membrane separation, and particularly relates to an organic solvent composite nanofiltration membrane as well as a preparation method and application thereof. A cross-linked polyimide ultrafiltration membrane is used as a base membrane, and a polyesteramide separation layer is obtained by polycondensation of a polyacyl chloride monomer and a polyamine monomer on the cross-linked polyimide base membrane. The preparation method comprises the following steps: soaking a naturally aired polyimide ultrafiltration base membrane in a water phase solution containing polyamine, airing, soaking in an organic phase solution containing polyacyl chloride, carrying out interfacial polymerization reaction, and carrying out thermal crosslinking post-treatment on the prepared membrane to obtain the thin-film composite nanofiltration membrane. And hydrophobic trifluoromethyl and hydrophilic phenolic hydroxyl are introduced by utilizing a functional group effect to prepare the thin-film composite nanofiltration membrane with a Janus pore channel structure. The membrane composite nanofiltration membrane can simultaneously improve the permeation flux of polar and non-polar solvents, obviously improves the flux of the non-polar solvent, can maintain low molecular weight cut-off, and has high economic value for separation of an organic solvent system in industry.

The invention discloses a preparation method of a multi-channel chabazite molecular sieve membrane. The high-performance chabazite molecular sieve membrane is prepared on a multi-channel carrier. The method comprises the following steps: (1) preparing a seed crystal; (2) coating a seed crystal layer on the multi-channel carrier; and (3) synthesizing the chabazite molecular sieve membrane by adopting a secondary growth method. By virtue of a multi-channel structure and specific pore channel characteristics, the prepared multi-channel chabazite molecular sieve membrane has high selectivity and can be used for accurately separating molecules with different sizes and properties. Meanwhile, rich transmission paths enable the membrane to have high flux, the permeation rate of substances is greatly improved, and compared with a single-channel molecular sieve membrane, the treatment capacity is remarkably improved.

The invention provides a column [5] aryl solid adsorption material for adsorbing carbon dioxide with high selectivity, which is prepared by the following steps: by taking N, N-dimethylbiguanide and bromoalkylated column [5] aryl as reaction precursors and triethylamine as a catalyst, grafting the N, N-dimethylbiguanide to the bromoalkylated column [5] aryl in anhydrous acetone, and loading the N, N-dimethylbiguanide to porous silica gel, wherein ultra-microporous cavity, mesoporous and macroporous structures of column [5] arene exist at the same time, so that the adsorption performance of CO2 is obviously promoted; meanwhile, due to the introduction of N, N-dimethyl diguanide, more amine active sites exist in the adsorbent, and the adsorption performance of the adsorbent on CO2 is further improved. When the adsorption material is used for separating CO2 / CH4 and CO2 / N2 mixed atmosphere, the CO2 adsorption performance of the adsorption material is superior to that of CH4 and N2, and the adsorption material has high separation selectivity on CO2 / CH4 and CO2 / N2. Besides, the adsorption material has good stability and cyclic regeneration performance, is a novel solid amine adsorption material which is expected to have great saturated adsorption capacity on CO2, and can be widely applied to efficient capture of carbon dioxide in closed space or coal bed gas, combustible ice and other environments.

The invention discloses a composite carbon molecular sieve and a preparation method thereof, and relates to the technical field of membrane separation. The invention discloses a preparation method of a composite carbon molecular sieve, which comprises the following steps: dipping a porous support in a coating solution, taking out, and drying to obtain a pretreated molecular sieve; carrying out carbonization treatment on the pretreated molecular sieve in an inert gas atmosphere to obtain a composite carbon molecular sieve; the porous support is firstly prepared to serve as a base membrane of the composite carbon molecular sieve, the mechanical strength of the molecular sieve is effectively improved, modified polyamide acid serves as a coating organic matter, the modified polyamide acid is attached to the surface of the porous support through an impregnation method, and the molecular sieve formed after the material is pyrolyzed and carbonized is loose in structure; the aperture adjustment of the molecular sieve is realized, and gas permeation and diffusion are facilitated.

The invention provides a method for extracting alpha-ketoglutaric acid from fermentation liquor. The method comprises the following steps: carrying out multi-stage fractional extraction on pretreated fermentation liquor; wherein an extracting agent for multi-stage fractional extraction comprises an oxygen-containing organic solvent with certain hydrogen bond alkalinity; preferably, the fermentation liquor is obtained by producing alpha-ketoglutaric acid and pyruvic acid through a microbial fermentation method; more preferably, fermentation liquor of alpha-ketoglutaric acid and pyruvic acid is produced by taking the Yarrowia lipolytica as a raw material; preferably, the concentration of the alpha-ketoglutaric acid in the fermentation liquor is 0.5 g / L-200 g / L. The oxygen-containing organic solvent used in the method has high separation selectivity and low water solubility and toxicity on the alpha-ketoglutaric acid, and the process is simple, safe and environmentally friendly.

The utility model provides an anesthetic xenon recovery system utilizing a CHA molecular sieve membrane, which realizes on-line purification and reuse of xenon in an anesthetic operation process. Compared with a traditional polymer membrane material, the adopted high-silicon CHA zeolite molecular sieve membrane is remarkably improved in the aspects of gas permeability and separation selectivity, so that the membrane area can be effectively reduced, and the miniaturization of a membrane assembly is realized. The problem that xenon is wasted in the anesthesia operation process is solved through the method.

The invention belongs to the technical field of phospholipid membrane monolithic columns, and particularly relates to a preparation method and application of a bionic phospholipid membrane monolithic column for screening and separating antimicrobial peptides. The bionic phospholipid membrane monolithic column is prepared from phospholipid monomers or mixed phospholipids, and is directly prepared in a quartz capillary through an in-situ polymerization reaction, so that the monolithic column has richer phospholipid types and a more complex phospholipid membrane structure, a biological membrane environment can be more accurately simulated, and the separation efficiency and selectivity are improved; the obtained mixed phospholipid membrane monolithic column is relatively good in polymerization condition, is tightly combined with a capillary wall, is excellent in structural performance, can realize separation of alkyl benzophenone compounds, has non-specific adsorption resistance, can also be used for separation, purification and screening of antibacterial peptides, and has wide application prospects. The method has important significance, and solves the problems of low efficiency, high cost, activity loss and the like existing in the conventional antibacterial peptide screening and purifying method.

The invention discloses a method for separating squalene from vegetable oil deodorized distillate, which comprises the following steps: mixing the vegetable oil deodorized distillate containing squalene with a first solvent to obtain a raw material solution, and carrying out fractional extraction on the raw material solution by using a second solvent as an extraction agent and a third solvent as a washing agent, the first solvent is selected from one or more of non-polar solvents and weak polar solvents, the second solvent is selected from one or more of polar solvents, and the third solvent is selected from one or more of non-polar solvents and weak polar solvents. The fractional extraction method adopted by the invention has the advantages of high treatment capacity, high product purity and recovery rate, low energy consumption and cost, easiness in amplification and the like, and is suitable for industrial production.

The invention discloses a polyamide composite membrane based on a positively charged support layer, a preparation method and application thereof, and belongs to the technical field of water treatment membranes. The preparation method of the polyamide composite membrane comprises: (1) using an amino monomer to perform amino modification on a porous support membrane to prepare an amino support membrane; (2) immersing the amino support membrane in a functional monomer solution to generate a Michael addition reaction or a nitrogen alkylation reaction to obtain a positively charged support membrane; (3) subjecting an aqueous phase solution containing a polyamine and an oil phase solution containing a polyacyl chloride to an interfacial polymerization reaction on the positively charged support membrane to obtain the polyamide composite membrane based on the positively charged support layer. The method of the invention has simple process and low equipment requirements. The prepared polyamide nanofiltration composite membrane has large water permeation flux, good ion selectivity and high antibiotic removal rate. The method has broad application prospects in the field of water treatment, especially in the removal of trace antibiotics in drinking water.

The invention relates to the technical field of membrane separation, in particular to a functional group regulated covalent organic framework (COF) membrane and a preparation method thereof, and relates to application of the membrane in selective separation of monovalent cations. The preparation method comprises the following steps: condensing a polyaldehyde monomer and aromatic diamine with different side chain substitutions on an interface through oil-water-oil three-phase interface micro-fluidic dripping to generate a two-dimensional COF nanosheet, carrying out ultrasonic dispersion, carrying out vacuum filtration, self-assembling on a porous substrate, and drying to obtain a continuous separation layer with the thickness of 50-150nm. The functional group can regulate and control pore channels and surface charges, flux and selectivity of monovalent cations such as Li < + > can be adjusted, effective separation is kept at the pH of 3-11, and the functional group is suitable for lithium salt extraction and electrolyte purification.

The invention discloses a GO composite membrane for high-selectivity separation of a low-molecular-weight cationic dye as well as a preparation method and application of the GO composite membrane. The composite membrane is constructed by coating a polymer ultrafiltration base membrane with polydopamine and alternately depositing composite graphene oxide and partially reduced graphene oxide. Wherein the composite graphene oxide is prepared by crosslinking crown ether amine and partially reduced graphene oxide. A cavity structure in the crown ether amine molecule can generate electrostatic interaction with the cationic dye, so that the selective interception of the composite membrane on the cationic dye is improved. The performance of the composite membrane can be optimized by controlling parameters such as a crown ether amine structure, the reduction degree of the graphene oxide, the loading proportion of the composite graphene oxide and the graphene oxide, and efficient separation of dyes with different molecular weights and charge types is realized. The GO composite membrane has high selectivity on low-molecular-weight cationic dyes, and is suitable for industrial printing and dyeing wastewater treatment, efficient dye separation and recovery and environmental pollution treatment.

An object of the present invention is to provide a porous adsorption material that is to be used for adsorbing and removing an impurity from a solution containing a raw biopharmaceutical compound while suppressing clogging and is high in separation selectivity, and the present invention provides a porous adsorption material that is to be used for adsorbing and removing an impurity from a solution containing a raw biopharmaceutical compound and includes a layer containing a nonionic polymer on at least one surface of the porous adsorption material.

The application belongs to the technical field of nuclear fuel cycle and nuclear waste liquid treatment. The application reports a kind of carboxyl-substituted o-phenanthroline water-soluble ligand based on selective masking of part of trivalent actinide under high acidity conditions, and under optimal conditions, the separation coefficient of trivalent europium can reach 120 in 1.5M nitric acid; the separation coefficient of trivalent cerium can reach 4.4. The single crystal structure of the complex is a double metal dimer structure, which guarantees the high acidity tolerance and high selectivity of the ligand. The synthesis of the ligand involved in the application is simple, the extraction efficiency is high, and the extraction mode is novel; the related content will greatly promote the design and performance optimization of water-soluble lanthanum, lanthanum, actinium and actinium separation ligand.

The invention belongs to the technical field of membrane separation, and discloses the application of a polyamide nanofiltration membrane to selectively separate new pollutants and salt ions in a water environment. The surface carboxyl density of the polyamide nanofiltration membrane is 60-200 μmol / m 2 , zeta potential ≤‑23mV, and average effective membrane pore size of 0.2‑1.0nm. The polyamide nanofiltration membrane with high negative charge and relatively low pore size prepared by the present invention has a retention rate of more than 99% for new pollutants and a retention rate of less than 40% for magnesium ions. The preparation method is simple and easy to implement, with low cost, and has broad application prospects in the "high decontamination and low hardness removal" water treatment technology.

The invention discloses a method for removing high-valence ions and organic matters in a lithium-rich solution of brine, which comprises the following steps: carrying out first nanofiltration separation on the lithium-rich solution with the pH value of 3.0-6.0, carrying out second nanofiltration on a first trapped fluid to further separate and recover lithium, and carrying out third nanofiltration on the first trapped fluid and a first permeate to realize deep removal of the high-valence ions and the organic matters. According to the invention, three-stage nanofiltration is subjected to series-parallel configuration and design, so that the separation effect of lithium ions, foreign ions and organic matters is improved; an electric field is arranged to strengthen the nanofiltration process driven by pressure, the solute hydration state difference and the mass transfer rate are enhanced, and the separation performance is improved. According to the method provided by the invention, the removal rate of high valence ions in the lithium-rich liquid is gt; 99.9%, and the organic matter removal rate gt; and the lithium ion flux is improved by more than 20%. The process and the strengthening measure are a separation method with high universality, impurity ions and organic matters in different types of lithium-rich solutions can be removed, and large-scale industrial popularization is facilitated.

The invention discloses an MFI type molecular sieve / PDMS composite membrane as well as a preparation method and application thereof, and relates to the technical field of pervaporation membranes. The method comprises the following steps: step 1, preparation of an MFI molecular sieve seed crystal layer: firstly, soaking a pretreated carrier in a poly (diallyldimethylammonium chloride) solution, heating, taking out, airing, coating the carrier with an MFI molecular sieve seed crystal, and drying to obtain a carrier with a flat and uniform seed crystal layer; by introducing the PDMS membrane prepared by the invention, the hydrophobicity of the surface of the whole composite membrane can be enhanced, and meanwhile, the possible defects of a molecular sieve membrane are made up, so that the separation selectivity of the membrane is improved to a certain extent; in the pervaporation process, the PDMS membrane part in the composite membrane can effectively reduce the contact between a raw material solution and the surface of the MFI molecular sieve membrane, so that the reaction between silicon hydroxyl and raw materials is reduced, and the stability of the membrane is improved.

The invention discloses a liquid chromatography method for rapidly determining D / L-amygdalin in traditional Chinese medicine semen armeniacae amarae / semen persicae. A chromatographic column stationary phase used in the method is a silica gel matrix bonded biphenyl reversed-phase chromatography filler; wherein the type of the silica gel substrate comprises full-porous silica gel, core-shell surface porous silica gel and hybrid silica gel; the bonded chemical functional group is a biphenyl group. According to the method, silica gel substrate bonded biphenyl reversed-phase chromatographic packing is adopted as a chromatographic column stationary phase, and optimal chromatographic column temperature, mobile phase type, flow velocity, elution method and the like are combined, so that the D / L-amygdalin in the traditional Chinese medicine semen armeniacae amarae / semen persicae is rapidly measured; according to the present invention, with the method, the baseline separation of the D / L-amygdalin in the sample can be achieved within the short analysis time, the good separation selectivity on the two epimers of the D / L-amygdalin is provided, the universality is provided, and the method can be simultaneously suitable for the determination of the D / L-amygdalin in the traditional Chinese medicine semen armeniacae amarae and the semen persicae.

The invention relates to the technical field of gas separation materials, in particular to a polysilsesquioxane gas separation membrane and a preparation method and application thereof.The polysilsesquioxane gas separation membrane comprises an alpha-Al2O3 supporting body, an alpha-Al2O3 particle layer, a transition layer and a polysilsesquioxane layer, and the preparation raw materials of the polysilsesquioxane layer comprise a bridging type silsesquioxane monomer and a pendant type silsesquioxane monomer. Through a strategy of copolymerization of a bridged silsesquioxane precursor and a pendant type silsesquioxane precursor, a composite membrane structure with a rigid skeleton / flexible micropore is constructed, the polysilsesquioxane gas separation membrane is designed and prepared, through fine regulation and control of a polysilsesquioxane network pore diameter and a pore channel environment, efficient molecular sieve separation of He / N2 is realized, and the separation efficiency of the polysilsesquioxane gas separation membrane is improved. The effect of extracting helium from tail gas of liquefied natural gas is very obvious, and the problems that a traditional method is high in cost and large in energy consumption, and a traditional silicon dioxide film is poor in hydrothermal stability, so that industrial production is not facilitated are solved.

The invention discloses a method for detecting aceclodine in a biological sample and application of the aceclodine in pharmacokinetics. The detection method comprises the following steps: taking a biological sample, adding 0.1-10 times of an aqueous solution containing a stabilizer into the biological sample, and uniformly mixing to obtain a biological sample solution; quantitatively transferring the biological sample solution, sequentially adding the internal standard substance working solution and the organic solvent, uniformly mixing in a vortex manner, and centrifuging; quantitatively transferring the obtained supernatant, adding pure water, uniformly mixing by vortex, centrifuging, and taking the supernatant to obtain a biological sample test solution; preparing a series of vinegar clinidine standard test solutions for the standard curve; and performing test analysis on the biological sample test solution and a series of vinegar clinidine standard test solutions for the standard curve by liquid chromatography-tandem mass spectrometry (LC-MS / MS). According to the invention, the method for detecting the aceclodine in the biological sample is applied to the pharmacokinetic research of the aceclodine in the living body, so that the technical blank in the aspect of aceclodine detection at present is filled up.

This invention discloses a method for preparing dehydroabscisic acid locust bean gum ester-bonded silica microspheres. The method uses dehydroabscisic acid locust bean gum ester (DLE) as a functional monomer. By adjusting the degree of substitution of DLE (0.001–2.5), an esterification reaction is carried out with a silica derivative to obtain dehydroabscisic acid locust bean gum ester-bonded silica microspheres (DLE@SiO231). These microspheres are then treated with a blocking agent to obtain blocked microspheres (DLE@SiO231M). The resulting microspheres have a particle size of 2–10 μm, an average pore size of 2–70 nm, and a specific surface area of ​​50–600 m². 2 The material exhibits uniform particle size and high mechanical strength. It can be used as a packing material for high-performance liquid chromatography (HPLC) columns or for solid-phase extraction. Due to the introduction of DLE (dihydrolamine), it possesses amphiphilic properties and demonstrates excellent selective separation capabilities for saponin drugs, showing broad application prospects in the field of drug separation and purification.

The present invention discloses a metal-organic cage complex mixed matrix membrane for gas separation and its preparation method and application. It relates to the fields of material science and gas separation. The mixed matrix membrane comprises a high molecular polymer and a porous metal-organic cage complex ZRT-1-2OH. The porous metal-organic cage complex ZRT-1-2OH filled in the mixed matrix membrane of the present invention is different from the traditional inorganic filling material. The traditional inorganic filling material has better separation performance as the filling amount in the mixed matrix membrane increases; while the porous metal-organic cage complex ZRT-1-2OH prepared by the present invention has the best separation performance of the membrane at a lower filling amount (2.17wt%), and then as its filling amount increases, the separation performance of the membrane decreases. The mixed matrix membrane of the present invention can be applied to the separation of various gases, and has broad application prospects.

This invention discloses a highly selective polyamide acid-resistant nanofiltration membrane containing telrogalg bases and its preparation method, comprising: firstly, using haloaniline monomers and aldehyde monomers as raw materials, synthesizing a telrogalg-based halobenzene intermediate under acidic conditions; then reducing the intermediate to prepare a telrogalg-based phenylenediamine (PDA-TB) functional monomer; subsequently, dissolving it together with polyethersulfone in a polar solvent to prepare a casting solution, which is then coated onto a nonwoven fabric. A polyethersulfone-supported substrate membrane rich in PDA-TB is prepared through a non-solvent-induced phase inversion. Next, a polyacrylamide organic phase solution is brought into single-sided contact with the substrate membrane surface, and a PDA-TB and polyacrylamide interfacial polymerization reaction is performed to prepare a highly selective polyamide acid-resistant nanofiltration membrane containing telrogalg bases. Compared with conventional piperazine amide nanofiltration membranes, the nanofiltration membrane prepared by this invention exhibits significantly improved acid resistance, narrower pore size distribution, and higher separation selectivity, and has broad application prospects.

The invention discloses a carborane hybridized two-dimensional porous metal organic supramolecular framework as well as a preparation method and application thereof. The two-dimensional porous metal organic supramolecular framework is composed of para-carborane dicarboxylate ions, metal ions Zn < 2 + > and protonated organic nitrogen-containing ligand 4, 4-dipyridylamine, and through tight ABAB filling, a two-dimensional framework structure with Z-shaped 1D channel holes is formed. The preparation method comprises the following steps: reacting Zn < 2 + >-containing salt, 4, 4-dipyridylamine and p-carborane dicarboxylic acid in an acidic solution at 50-100 DEG C to obtain a solid product; and placing the solid product in methanol for one or more times of solvent exchange to remove solvent molecules, and then vacuumizing, degassing and activating to remove methanol molecules in pore channels to obtain the two-dimensional porous metal organic supramolecular framework. The two-dimensional porous metal organic supramolecular framework has high separation selectivity on C2H2 / CO2, and has preferential carbon dioxide adsorption selectivity.

The invention discloses a preparation method of a super-hydrophobic PEI / MXene / titanic acid film, which comprises the following steps: S1, mixing and stirring two-dimensional Ti3C2MXene powder, polyetherimide powder and an N-methyl pyrrolidone solution to form uniform slurry; s2, spin-coating the PEI / MXene film on a substrate to form a PEI / MXene film; s3, carrying out surface roughening treatment to expose the MXene surface; s4, immersing into a hydrogen peroxide reaction system, and growing a titanic acid nanowire; and S5, carrying out super-hydrophobic group modification and stabilization treatment on the surface of the composite membrane to form a super-hydrophobic surface, and finally obtaining the super-hydrophobic PEI / MXene / titanic acid membrane. According to the preparation method disclosed by the invention, the PEI / MXene / titanic acid membrane has super-hydrophobicity and excellent oil-water separation performance, the long-term durability and anti-pollution capacity of the membrane are ensured, the overall comprehensive performance is strong, and the urgent demand on a high-performance separation material in industrial application can be met.

The present invention belongs to the technical field of phospholipid membrane monolithic columns, and specifically relates to a preparation method and application of a bionic phospholipid membrane monolithic column for screening and separation of antimicrobial peptides. The bionic phospholipid membrane monolithic column is prepared by using phospholipid monomers or mixed phospholipids, and is directly prepared in a quartz capillary through an in-situ polymerization reaction. The monolithic column has richer phospholipid species and more complex phospholipid membrane structures, can more accurately simulate the biomembrane environment, and improve separation efficiency and selectivity. The obtained mixed phospholipid membrane monolithic column has good polymerization, and is tightly combined with the capillary wall. The spherical pores are condensed into larger dispersed macroporous channels, and the structural performance is excellent. It can realize the separation of alkyl phenone compounds, and has the ability to resist nonspecific adsorption. It can also be used for the separation, purification and screening of antimicrobial peptides, which is of great significance and solves many deficiencies in the existing screening and purification methods of antimicrobial peptides, such as low efficiency, high cost, activity loss and other problems.

The present invention relates to a liquid chromatography stationary phase, which is characterized in that the bonded phase contains a mercaptopyridine structure, and the structural formula thereof is as follows: wherein Silica Gel is silica gel, and n=0-10. The present invention also provides a method for preparing the above-mentioned chromatographic stationary phase, and a novel chromatographic stationary phase is prepared by a mercapto-epoxy ring-opening reaction. The separation material preparation method provided by the present invention is simple and efficient, and the mercaptopyridine structure is contained in the stationary phase, which can provide a variety of forces, and at the same time, a variety of functional groups such as ether bonds and hydroxyl groups can provide different separation selectivities, and can be widely used in the separation and analysis of various compounds.

The invention relates to the technical field of materials, and discloses a polysulfone ether porous membrane as well as a preparation method and application thereof. The polysulfone ether porous membrane comprises a first polymer layer and a second polymer layer which are overlapped with each other, the average pore size of the first polymer layer is 55-245nm, and the porosity is 18-30%; the average pore size of the second polymer layer is 10-18 microns, and the porosity of the second polymer layer is 70%-85%; wherein the surface porosity of the polysulfone ether porous membrane is greater than or equal to 28%. The polysulfone ether porous membrane provided by the invention has an asymmetric structure, and the polysulfone ether porous membrane has an open bicontinuous structure surface, has excellent high surface porosity characteristics and high CH4 permeation rate characteristics, has relatively high permeability and selectivity to VOCs, and can be used for preparing a porous membrane for the VOCs. The composite film formed by using the composite film as a porous support layer has high separation efficiency and selectivity, can effectively adsorb and remove harmful gases such as VOCs and the like, and improves the treatment efficiency.