912 results about "Adsorption separation" patented technology

The invention discloses a method for continuously and efficiently adsorbing and separating hydrogen isotopes. The hydrogen isotopes are separated by adopting a multi-tower variable-temperature variable-pressure device operated in a simulated moving bed operation mode. When the device runs, each adsorption tower needs to sequentially execute the following steps: 1, adsorption; 2, replacement; 3, heating; 4, vacuumizing and desorbing; 5, carrying out vacuum purging; 6, pressurizing and cooling; the operation mode of the simulated moving bed is that an adsorption tower is frequently, sequentially and synchronously moved along the gas flowing direction in the tower through all gas input and output ports, so that an adsorbent phase and a gas flowing phase in the tower form countercurrent flow, and the hydrogen isotope adsorption separation efficiency is enhanced. The invention relates to a technological process of cyclic adsorption, replacement, heating, vacuum desorption, pressurization and cooling, continuous and efficient hydrogen and isotope adsorption separation is realized, multi-tower serial adsorption and replacement are adopted in the process, and separation of hydrogen isotopes (such as H2 / D2) is enhanced; and the desorption efficiency of heavy components is improved by adopting a heating and vacuumizing depressurization coupling mode.

The invention relates to the technical field of low-temperature adsorption and isotope separation, in particular to a low-temperature helium isotope adsorption separation system and a low-temperature helium isotope adsorption separation method, and the system comprises a gas distribution and gas recovery module which is used for preparing and mixing helium isotope raw material gas and recovering residual gas after an experiment; the static testing unit is used for testing the performance of the adsorbent under a fixed condition; the dynamic low-temperature adsorption unit is used for helium isotope separation under a continuous flow condition; the low-temperature control module is used for providing a stable low-temperature environment and accurate temperature control; wherein an air inlet pipe and an air outlet pipe of the low-temperature control module are respectively subjected to thermal sedimentation and are respectively connected with a flow controller. According to the scheme, the defects that in the prior art, He resources are seriously short, and existing low-temperature adsorption separation helium isotope examples are few are overcome, reference is provided for low-temperature adsorption separation helium isotope adsorbent screening and system design, development of the He separation and purification technology in China is promoted, and dependence on imported He is reduced.

The invention discloses a method for extracting lithium from gas field produced water with a high sodium-lithium ratio, and belongs to the technical field of chemical engineering. The mass ratio of sodium to lithium in the gas field produced water is (100-1000): 1, and the method comprises the following steps: S1, nanofiltration: carrying out nanofiltration on the gas field produced water, and intercepting divalent ions to obtain nanofiltration produced water and nanofiltration concentrated water; s2, adsorbing and extracting lithium, namely adjusting the pH value of the sodium-filtered produced water, treating the sodium-filtered produced water through a lithium-sodium adsorption and separation device filled with an adsorbent to realize sodium-lithium separation, and collecting the adsorbed lithium-extracted produced water; s3, desorption of lithium ions: eluting the adsorbent with an acid solution to desorb the lithium ions from the adsorbent, and collecting an eluent; s4, concentration: carrying out reverse osmosis treatment on the eluent, and treating the reverse osmosis concentrated solution through an electrodialysis device to obtain a concentrated lithium-containing concentrated solution; and S5, lithium precipitation: adjusting the pH value of the lithium-containing concentrated solution, adding a lithium precipitation agent, and crystallizing and precipitating lithium to obtain industrial-grade lithium carbonate. The process is simple, the lithium recovery rate during lithium precipitation can be effectively increased, and full-automatic continuous operation can be achieved.

The invention provides a synthesis method of a bromide ion adsorbent for salt lake bromine extraction, and belongs to the technical field of adsorbent preparation, a mixed solution of strontium chloride and manganese chloride and a mixed solution of sodium phosphate and sodium hydroxide are subjected to precipitation reaction to obtain A-Sr4Mn6 (PO4) 6 (OH) 2; the preparation method comprises the following steps: reacting A-Sr4Mn6 (PO4) 6 (OH) 2 with a sodium bromide solution to obtain B-Sr4Mn6 (PO4) 6Br2; and reacting the B-Sr4Mn6 (PO4) 6Br2 with a sodium hydroxide solution to obtain Sr4Mn6 (PO4) 6 (OH) 2, namely the bromide ion adsorbent. The prepared adsorbent can selectively adsorb bromide ions from high-salt brine, and has the advantages of high adsorption capacity, high selectivity, high recyclability and the like; in brine with extremely high chloride ion concentration, low-concentration bromide ions can be selectively adsorbed without being influenced by high-concentration chloride ions; in a high-salt water body, the adsorption capacity on bromide ions is higher; the selective adsorption separation of the chloride ions and the bromide ions is realized.

The invention discloses a diaphragm sorting device for waste lithium battery recycling, and relates to the technical field of diaphragm sorting, the diaphragm sorting device for waste lithium battery recycling comprises a shell, a screening assembly, a winnowing assembly and an adsorption separation assembly.Large particles, medium particles and light materials are screened out through small screen holes, medium screen holes and large screen holes in a screen, and when the screen reciprocates up and down, the large particles and the medium particles are separated; the two symmetrically-arranged baffles are driven by the connecting rod to conduct continuous opening and closing actions, periodic opening and closing are achieved, the opening and closing frequency of the baffles is synchronous with the vibration frequency of the screen, dynamic control over falling materials is formed, it can be ensured that the materials falling every time are single-layer particles, multi-layer accumulation is avoided, and when the single-layer materials fall, the particles are evenly distributed in the vertical direction, and the quality of the particles is improved. Air flow can vertically act on each particle conveniently, the situation that bottom layer particles in multiple layers of materials cannot be effectively separated due to insufficient air flow penetration is avoided, and the screening precision is remarkably improved through linkage control of screen vibration and the baffles.

The invention relates to an aromatic hydrocarbon isomer adsorbent containing a modified X-type molecular sieve. The outer surface area of the modified X-type molecular sieve is 9.5-19m < 2 > / g, and the sum of the pore volume of mesopores and the pore volume of macropores is 6%-18% of the total pore volume. The p-xylene adsorbent comprises 88-95% by mass of a modified X-type molecular sieve, 4-11% by mass of a crystal transformation X-type molecular sieve and 1-3% by mass of a matrix. The invention also relates to a preparation method of the adsorbent and application of the adsorbent in adsorption separation of p-xylene from mixed C8 aromatic hydrocarbons.

The invention provides an SSZ-13 molecular sieve as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing activated silica-alumina minerals, SSZ-13 seed crystals, a silicon source, a template agent and a second alkali source to obtain dry glue, and then carrying out crystallization treatment on the dry glue in the presence of water vapor to obtain the SSZ-13 molecular sieve. According to the preparation method, a solvent is not adopted, a small amount of deionized water is used for providing a steam phase, the utilization rate of the raw materials can be increased, the high solid yield is obtained, the loss of a solid phase is reduced, no alkaline wastewater is generated, and the synthesis cost of the SSZ-13 molecular sieve is remarkably reduced. When the SSZ-13 molecular sieve prepared by the method is used for CO2 / CH4 adsorption separation, the SSZ-13 molecular sieve has relatively high separation selectivity.

The invention provides a method for preparing high-purity phosphatidylserine by a batch enzyme catalysis method based on dynamic choline removal, and belongs to the technical field of enzymatic reaction. According to the method disclosed by the invention, in a reaction system for preparing phosphatidylserine, a byproduct choline is selectively adsorbed by adopting resin. Choline in a reaction system is removed in real time through the integrated adsorption separation module, the enzyme inhibition problem is solved, and meanwhile, the PC conversion rate is larger than or equal to 98% and the PS purity is larger than or equal to 96% in combination with the immobilized enzyme circulation technology; the enzyme can be reused for more than or equal to 20 times (activity retention is more than or equal to 90%); and the choline residual concentration is less than or equal to 0.5 mM (an inhibition threshold value or less).

The invention provides an improved ammonia production system based on a temperature swing adsorption principle. The improved ammonia production system comprises a water electrolysis hydrogen production module, a deep cooling air separation nitrogen production module, a multi-stage ammonia synthesis tower module and a double-bed circulating adsorption separation ammonia module, the water electrolysis hydrogen production module and the deep cooling air separation nitrogen production module provide raw material gas for the multi-stage ammonia synthesis tower module through a mixer, low-grade waste heat of a multi-stage ammonia synthesis tower serves as a heat source of the double-bed circulating adsorption separation ammonia module, and the double-bed adsorption separation ammonia module is connected with the multi-stage ammonia synthesis tower. The working conditions of an adsorption bed of the double-bed ammonia adsorption and separation module comprise an adsorption working condition and a desorption working condition, the adsorption bed alternately performs the adsorption working condition and the desorption working condition within the operation time, and low-grade waste heat from a multi-stage ammonia synthesis tower is used for driving to perform separation operation on ammonia synthesis gas so as to obtain high-purity ammonia; according to the invention, the operation pressure in an ammonia product separation project can be effectively reduced, circulation is formed, and the purity and the recovery rate of the obtained ammonia product are not reduced while the waste heat in the system is further utilized.

The invention discloses two aluminosilicate molecular sieves with super-macroporous structures, the synthetic state schematic chemical composition of the molecular sieves is rROH: a (OH <-> or F <->): xAl2O3: SiO2: wH2O, the schematic chemical composition of the molecular sieves after roasting is (HAlO2) x.SiO2, the molecular sieves are NJU120-1, and after roasting of the NJU120-1, the molecular sieves have the molecular weight of 250,000-350,000. A framework structure composed of a T (Si, Al) O4 tetrahedron has a 22 * 10 * 10 membered ring three-dimensional pore channel system, the molecular sieve is NJU120-2, and after the NJU120-2 is roasted, the framework structure composed of the T (Si, Al) O4 tetrahedron has a 22 * 12 * 10 membered ring three-dimensional pore channel system. The preparation method is reasonable in design, is a novel germanium-free, high-silicon or pure-silicon and fully-connected super-macroporous molecular sieve material, not only has very important practical application value in the fields of catalysis, adsorption separation and the like, but also has very important theoretical significance for enriching molecular sieve structure families.

The invention discloses a fused electrostatic spinning polymer / molecular sieve blended composite fiber as well as a preparation method and application thereof. The melt electrostatic spinning polymer / molecular sieve blended composite fiber is prepared from the following raw materials in parts by weight: 25-90 parts of a thermoplastic polymer matrix, 5-75 parts of a molecular sieve, 1-10 parts of a compatibilizer and 0-5 parts of a conductive additive. According to the polymer / molecular sieve blended composite fiber material and the preparation technology, no solvent participates in the whole process, and the green manufacturing requirement is met. Moreover, in the fiber material, the molecular sieves can be uniformly distributed on the superfine polymer fibers, scanning electron microscope pictures show that the molecular sieves are uniformly embedded into the material, no aggregate larger than 10 microns exists, and the fiber material has a hierarchical pore structure, a high specific surface area and excellent mechanical properties. Therefore, the fiber material can be applied to the fields of air filtration, catalytic reaction, drying purification, adsorption separation and the like.

The invention discloses a proton-type ionic liquid super-crosslinked polymer and a preparation method and application thereof in carbon dioxide adsorption, proton-type ionic liquid is used as a connection building block, and the two types of connection building blocks are subjected to catalytic polymerization by adjusting the ratio of the proton-type ionic liquid to a cross-linking agent connection building block to obtain the proton-type ionic liquid super-crosslinked polymer. The proton type ionic liquid super-crosslinked polymer obtained by the invention has a super-crosslinked anion network structure. The carbon dioxide adsorption and separation capacity is obviously improved by utilizing a high specific surface area, a high total pore volume and exposed multi-nitrogen sites, so that efficient, high-capacity and reversible adsorption of carbon dioxide gas is realized.

The invention relates to analcime with an ANA structure and a preparation method of the analcime, the chemical molecular formula of a unit cell of the analcime with the ANA structure is Na < x > [SiyAlzO96], x is equal to 6-15, y is equal to 30-37, and z is equal to 10-16; the analcime with the ANA structure has a spherical crystal morphology. The analcime with the ANA structure disclosed by the invention has a spherical crystal morphology, shows excellent molecular diffusion performance, and has a good application prospect in the fields of small molecular acid catalytic reaction, small molecular gas adsorption separation, ion adsorption purification and the like.

The invention discloses a macroporous resin material and a preparation method thereof, and macroporous resin with high specific surface area and excellent adsorption performance is obtained through a specific modified acrylate polymeric monomer and a preparation method of the macroporous resin material. The method comprises the following steps: reacting quercetin, methyl vanillate and acryloyl chloride to prepare a modified acrylate polymeric monomer, mixing the modified acrylate polymeric monomer with polyvinyl alcohol, ethylene glycol dimethacrylate, dodecanol, benzoyl peroxide and the like, and carrying out suspension polymerization to prepare the macroporous resin material. The prepared macroporous resin material has excellent performance in the aspects of pore structure, polarity and the like, can be widely applied to the related fields of adsorption separation and the like, and provides a new thought and method for research and development of the macroporous resin material.

The invention provides a helium isotope low-temperature adsorption separation system and method, and relates to the technical field of isotope separation. The helium isotope low-temperature adsorption separation system comprises an adsorption column, a low-temperature control unit, an adsorbent regeneration unit, a helium isotope gas outlet control unit, a helium isotope gas inlet and recovery control unit and a system purging replacement unit, the low-temperature control unit comprises a refrigerating machine, a vacuum cover, a first-stage cold screen, a second-stage cold screen, a first-stage anti-radiation screen, a second-stage anti-radiation screen, an air inlet pipe and an air outlet pipe, the first-stage anti-radiation screen is arranged in the vacuum cover, the first-stage cold screen is arranged at an opening of the first-stage anti-radiation screen, and a mounting hole is formed in the first-stage cold screen. The helium isotope low-temperature adsorption separation system provided by the invention has the characteristics of accurate temperature control in a wide temperature area, accurate adsorption pressure control, high rewarming desorption speed, high adsorption efficiency and gas recoverability, is simple in structure and convenient to operate, and has great significance in separation research of helium isotopes.

The invention discloses a real-time monitoring data control method for adsorption separation and an adsorption separation device, and relates to the technical field of adsorption and analysis regulation and control. The method comprises the following steps: setting a first cleanliness threshold value of finished gas and a second cleanliness threshold value of desorption gas; according to the current state of the first cleanliness and the current state of the second cleanliness, the regeneration medium flow of the analysis process is dynamically adjusted; or when the first cleanliness reaches the first cleanliness threshold value and the second cleanliness reaches the second cleanliness threshold value, the current adsorption process is ended, and the working mode is switched; if the second cleanliness does not reach the threshold value, the regeneration medium flow is increased until the switching condition is met. Saturation regulation is carried out by monitoring the dual states of the finished gas and the desorption gas in real time, actual working condition fluctuation can be responded in a self-adaptive mode, the quality stability of the finished gas is guaranteed, meanwhile, the problem that regeneration is insufficient or regeneration media are excessively consumed is solved, and operation energy consumption is remarkably reduced.

Provided in the present invention are a preparation method for a crown ether covalent organic framework material, and the use thereof in iodine adsorption. In the present invention, an 18-crown-6-ether group is introduced into the structure of a covalent organic framework (COF) material for iodine adsorption work. The covalent organic framework material can form a one-dimensional pore channel structure in order, and the 18-crown-6-ether can be selectively complexed with iodine molecules, thereby achieving the purpose of efficient iodine adsorption. The material can perform specific iodine adsorption from high-temperature iodine steam, and the iodine steam adsorption capacity of the COF material is as high as 5.56 g / g. The COF material has a high adsorption capacity, is easy to prepare and simple to operate, has a high adsorption efficiency, and is particularly suitable for adsorbing and separating radioactive iodine in the nuclear industry.

The invention provides an adsorption process for recovering ethylene from refinery dry gas through combination of MOF and zeolite, raw material gas is refinery dry gas, a main body contains hydrogen, carbon dioxide, C1-C3 low-carbon hydrocarbon gas and the like, the content of C2H4 is about 10%, a pre-decarburization process and an associated bed process are introduced, the adsorption capacity of an adsorbent is protected, and the content of ethylene is reduced. The non-compliant purity ethylene gas in the pressure swing adsorption process is re-enriched and recovered through an associated bed; in the initial stage of adsorption separation, after CO2 is removed through a customized or commercialized adsorbent, C2H4 enrichment and purification are directly carried out, and by introducing an associated bed, ethylene in gas passing through the adsorption process and ethylene gas in the preliminary desorption process of the adsorption bed are captured again, so that the ethylene recovery rate in the process is improved.

A method of producing a mesoporous chitosan / sodium iron silicate (NaFeSi2O6) nanocomposite includes hydrothermally treating a mixture of sodium metasilicate pentahydrate (Na2SiO3·5H2O) with iron(III) chloride hexahydrate (FeCl3·6H2O) to obtain NaFeSi2O6 nanoparticles. The method further includes combining the NaFeSi2O6 nanoparticles with a solution of chitosan to generate a precursor mixture; treating the precursor mixture with sodium hydroxide (NaOH), resulting in a nanocomposite where chitosan coats and aggregates the NaFeSi2O6 nanoparticles into rod-like structures. The resulting nanocomposite exhibits unique textural properties with mesopores larger than 15 nm, is ideal for adsorption, separation, and catalysis, and can be produced under mild conditions without complex procedures or hazardous chemicals.

The invention relates to the technical field of methanol resource utilization, and discloses a system for preparing methanol based on SOEC-CH4 electrolysis, which is characterized in that a cathode subsystem main body reacts to generate water vapor and H2 mixed gas, the water vapor and H2 mixed gas are condensed and separated to obtain H2, and most of H2 is conveyed to an H2 storage buffer tank and stored; the anode subsystem for preparing CO2 comprises a CH4 tank, an anode subsystem main body and an electrolytic bath anode of an SOEC electrolytic bath which are communicated in sequence, and the anode subsystem main body reacts to generate water vapor, CH4 and CO2 mixed gas; the mixed gas of the water vapor, CH4 and CO2 is subjected to condensation and adsorption separation to obtain CO2, and most of CO2 is conveyed to a CO2 storage buffer tank to be stored; and the methanol preparation subsystem reacts to obtain methanol. According to the system for preparing methanol through electrolysis, methane is introduced to prepare carbon dioxide, the technical problems of high energy consumption and low comprehensive utilization rate of waste heat and wastewater are solved, and cost is greatly reduced to prepare methanol.

The invention discloses a carbon fluoride molecular sieve adsorbent, a preparation method thereof and application of the carbon fluoride molecular sieve adsorbent in purification of electronic-grade fluorine-nitrogen mixed gas. According to the method, a stable passivation layer composed of fluorine-containing chemical bonds is formed on the inner surface and the outer surface of a carbon material through direct fluorination treatment on a carbon molecular sieve. Compared with other fluorination methods, the method has the advantages of higher fluorination degree and lower reaction temperature; meanwhile, the operation is simple, and the thermal stability of fluorine-containing groups on the surface of the treated carbon molecular sieve is good. The fluorinated carbon molecular sieve adsorbent has greatly improved corrosion resistance, can maintain stable adsorption separation performance in gas atmospheres with extremely strong corrosivity, such as fluorine gas and hydrogen fluoride, and is suitable for deep removal of trace oxygen impurities in electronic-grade gas fluorine-nitrogen mixed gas.

The invention provides a method for recovering platinum group metal from a waste automobile exhaust purification catalyst, and belongs to the field of precious metal recovery. The method comprises the following steps: carrying out crushing and impurity removal pretreatment on the waste catalyst to obtain solid residues; mixing the obtained solid slag with alkali liquor, and performing hot-pressing activation to obtain active slag; leaching the active slag by using an acid leaching system of hydrochloric acid-hydrogen peroxide-sodium chloride to obtain a leaching solution enriched with platinum group metals; adjusting the acidity of the leachate, adding a first adsorption material, selectively adsorbing platinum and palladium, and separating supernate and a platinum / palladium enrichment material; adjusting the acidity of the supernate, adding a second adsorption material, selectively adsorbing rhodium, carrying out solid-liquid separation, and collecting a rhodium enrichment material; respectively eluting and refining the platinum / palladium enrichment material and the rhodium enrichment material, and recovering platinum, palladium and rhodium; through the optimally designed recovery method of alkaline hot-pressing activation-mild acidic directional leaching-two-stage magnetic adsorption separation, efficient recovery of platinum, palladium and rhodium in the waste automobile exhaust catalyst is realized.

The invention provides a crown ether functionalized covalent organic framework material and a preparation method and application thereof, the crown ether functionalized covalent organic framework material has a structure as shown in a general formula A. Benzocrown ether functional groups are introduced into the structure of the covalent organic framework material through a bottom-to-top method for adsorption separation of lithium ions; and the lithium adsorption capacity is good.

The invention relates to a method for separating octafluoropropane and hexafluoropropane, which comprises the following steps: carrying out adsorption separation on a mixed gas containing hexafluoropropane and octafluoropropane by using an adsorbent containing a metal organic framework material, the metal organic framework material comprises metal ions and an organic ligand, and the organic ligand comprises a compound as shown in formula I; the metal ions are selected from one or more of transition metal ions and alkaline earth metal ions. The metal organic framework material has good material stability, the synthesis conditions are mild and simple, and the raw materials are low in price. The metal organic framework material provided by the invention has very high adsorption separation selectivity on hexafluoropropylene and octafluoropropane, and has a good industrial application prospect. # imgabs0 #

The invention relates to the technical field of rare earth element separation methods, in particular to a method for separating ytterbium and lutetium by using a phosphate adsorbent, which comprises the following steps: loading a phosphate solution on a porous solid-phase carrier by using a vacuum impregnation method, and carrying out reduced pressure evaporation and drying to obtain a phosphate solid adsorbent; filling an exchange column with the solid adsorbent to obtain the exchange column filled with the solid adsorbent; enabling a nitric acid solution containing ytterbium and lutetium to flow through an exchange column filled with a solid adsorbent to complete a column adsorption process; and performing elution, performing desorption by using a desorption solution to obtain the regenerated exchange column filled with the solid adsorbent, respectively collecting the ytterbium solution and the lutetium solution, completing the separation process, and repeating the steps. By adopting the steps, the separation of ytterbium and lutetium is directly realized from the nitric acid solution containing ytterbium Yb and lutetium Lu through column adsorption separation, leaching and desorption processes, and high-purity ytterbium and lutetium products are prepared.

The invention discloses a carboxyl-functionalized porous organic polymer, a preparation method thereof and application of the carboxyl-functionalized porous organic polymer in ammonia gas adsorption separation and sensing. The polymer is obtained by free radical polymerization, hydrolysis and acidification of monomers containing vinyl and ester groups, and has a mesoporous structure and a skeleton carboxyl functional group. The preparation method is simple and mild in condition. The polymer has excellent adsorption selectivity and high adsorption capacity on ammonia gas, the static adsorption capacity on the ammonia gas under the conditions of 298 K and 1 bar is not lower than 6.5 mmol / g, the ammonia gas can be efficiently separated from NH / N / H and NH / COs mixed gas, and the cycling stability is good. An ammonia gas sensor prepared by taking the graphene oxide as a sensitive material has linear or piecewise linear response to ammonia gas with the concentration of 1-100 ppm at room temperature, the detection limit is lower than 30 ppb, and the selectivity is excellent. The invention overcomes the defects of the existing ammonia gas adsorption separation material and sensor, has important significance for optimizing the ammonia production process and reducing pollution, and has wide application prospects.

The invention provides equipment and a method for testing permeation filtration performance of a hollow fiber membrane. The equipment comprises a rack, a clamp assembly, a circulating detection system, a control panel, a raw material tank and a wastewater tank, the clamp assembly comprises an upper clamp, a lower clamp, a sealing ring and a driving device; wherein the upper clamp and the lower clamp are provided with cavities for accommodating hollow fiber membrane filaments, so that the upper clamp, the lower clamp and the sealing ring are spliced to form a closed space, and the lower clamp is also provided with two hole channels communicated with the cavities; quick connectors are arranged on two sides of the sealing ring, inlet ends of the hollow fiber membrane filaments are connected with the raw material tank through the quick connectors, and outlet ends of the hollow fiber membrane filaments are connected with the wastewater tank through the quick connectors; the circulating detection system comprises an adsorption separation device, a circulating pump and a detection unit; the adsorption separation device is connected with one hole channel, and the adsorption separation device is sequentially connected with the circulating pump and the detection unit. According to the invention, accurate measurement of the penetration amount of the single hollow fiber membrane silk can be realized.

The invention belongs to the technical field of preparation of membrane materials and adsorption separation materials, and particularly relates to an MOFs / PVA cross-linked composite film as well as a preparation method and application thereof. The preparation method comprises the following steps: modifying MOFs with amino on the surface to enable the surface of the MOFs to have silicon hydroxyl, then mixing with polyvinyl alcohol (PVA), and heating and drying in a mold to obtain the MOFs / PVA cross-linked composite film. The cross-linked composite film provided by the invention is uniform and continuous, and the problem of poor dispersibility of the MOFs material in the mixed matrix film is solved. The film has good adsorption capacity on metal ions such as molybdate radicals, is high in hydrophilicity and still has a stable film structure in an acid environment, and an effective solution is provided for treatment of heavy metal pollution in industrial wastewater.

The invention discloses a preparation method and application of a metal covalent organic framework material, and the prepared metal covalent organic framework material can be used for adsorption separation of elemental iodine pollutants and shows excellent iodine adsorption capacity and rate. According to the preparation method, 1H-pyrazole-4-formaldehyde and copper nitrate trihydrate are subjected to a solvothermal reaction to prepare a copper ion ring trinuclear metal complex with an aldehyde group, and the copper ion ring trinuclear metal complex and 1, 3, 5-tri (4-aminophenyl) benzene are further subjected to a Schiff base reaction to prepare the metal covalent organic framework material containing copper ions. According to the metal covalent organic framework material disclosed by the invention, copper ion active adsorption sites in a chemical structure are also retained while a developed microporous structure is maintained, and the interaction strength of pore channels to iodine is remarkably enhanced, so that the iodine adsorption rate and capacity are remarkably improved. The preparation method is simple, convenient, universal and high in controllability, and large-scale production and manufacturing of the metal covalent organic framework adsorption material can be achieved.

The present invention relates to the technical field of polymer preparation. Disclosed are a covalent organic framework material, and a preparation method therefor and a use thereof. The preparation method for the covalent organic framework material comprises the following step: subjecting an organic aldehyde and an organic amine to a condensation reaction in a deep eutectic solvent to obtain the covalent organic framework material, wherein the deep eutectic solvent is a two-component eutectic liquid composed of menthol and acetic acid. The temperature for the reaction is 25-120ºC, and the time for the reaction is 1-72 hours. The deep eutectic solvent composed of menthol and acetic acid used in the present invention has good dissolution properties for organic matters, and can also efficiently catalyze the condensation reaction between the organic amine and the organic aldehyde. The prepared covalent organic framework material exhibits high crystallinity and has good applications in the fields of adsorptive separation, heterogeneous catalysis, energy storage, etc. The present method has mild reaction conditions, simple operation, and good universality, is conducive to industrial large-scale production, and conforms to the concept of green chemistry.