36results about How to "Large adsorption capacity" patented technology

This utility model discloses an ozone advanced oxidation tail gas recovery and utilization device, including an ozone tail gas inlet pipe and a primary purification tower and a secondary purification tower connected in sequence. The rear end of the secondary purification tower is connected to an ozone buffer tank. The primary and secondary purification towers are connected to the ozone tail gas inlet pipe through an ozone circulation pipe. Both the primary and secondary purification towers are connected to sodium hydroxide dosing tanks. This application uses a secondary ozone purification tower to purify the tail gas after ozone catalytic oxidation, recover and utilize the remaining ozone, improve ozone utilization rate, and reduce costs. At the same time, it absorbs the carbon dioxide after catalytic oxidation to produce a high-purity sodium carbonate solution for downstream use as a raw material, achieving waste resource recycling.

The application relates to the technical field of catalysts, and discloses a limited type iodine-based homogeneous immobilized catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and iodine ions, magnesium ions and quaternary ammonium ions loaded on the carrier, wherein the molar ratio of the magnesium ions, the quaternary ammonium ions, the iodine ions and the carrier is 0.01-1:4-15:1-30:1. The limited type iodine-based homogeneous immobilized catalyst disclosed by the application enhances the electrostatic interaction between iodine ions and quaternary ammonium ions through the molecular sieve limiting effect to construct a limited type structure. The catalyst has significantly enhanced CO2 adsorption and activation capacity, can activate an epoxide compound, and accelerates the ring opening of the epoxide compound. In a cycloaddition reaction catalyzed by the catalyst under the conditions of no solvent and no auxiliary agent, the conversion rate of propylene oxide can reach more than 73%, and the propylene carbonate selectivity can reach more than 85%.

This invention provides a multi-puff electronic cigarette cartridge and an electronic cigarette system used in conjunction with the cartridge. The cartridge includes a cartridge shell (9) and a cartridge bottom cover (5). The bottom cover (5) has a vertically penetrating atomizing carrier cavity (51) in the middle, and the atomizing carrier cavity (51) houses the oil-storing heating component. The oil-storing heating component includes a magnetic heating element (6) and an electronic cigarette atomizing carrier (7) fitted together. The magnetic heating element (6) is at least partially hollowed out in a tubular shape, and at least part of the material of the magnetic heating element (6) is metal. The middle part has a smoke flow channel (61) arranged along the length direction. Electronic cigarette atomizing agents are adsorbed in the electronic cigarette atomizing carrier (7). The cartridge of this invention sets the magnetic heating element and the electronic cigarette atomizing carrier together and installs them in the bottom cover, which has the characteristics of simple structure and easy manufacturing.

The application provides a copper adsorption material and a preparation method and application thereof, and the copper adsorption material is prepared by using salicylic hydrazide monomers and methacrylic acid as raw materials through an emulsion polymerization method. The salicylic hydrazide monomers used in the application are salicylic hydrazide derivatives with introduced propylene bonds, and the multi-dentate coordination structure of the salicylic hydrazide derivatives can specifically chelate copper ions; the hydrophilic monomer used is methacrylic acid, and the carboxyl group of the methacrylic acid can bring good hydrophilic performance to the material and improve adsorption kinetics. The copper adsorption material of the application is applied to a mixed solution containing copper ions, nickel ions and cobalt ions to selectively separate copper ions.

The present application relates to the technical field of metal organic framework materials, in particular to a modified copper-based metal organic framework material, a preparation method and application thereof, and a sulfide removal method. The modified copper-based metal organic framework material comprises a metal organic framework formed by copper and an organic ligand, and silver doped on the metal organic framework; and the crystal surface of the modified copper-based metal organic framework material has long and narrow honeycomb-shaped pores. + and Ag + The modified copper-based metal organic framework material has suitable pore structures and rich adsorption sites for removing various organic sulfides, and the modified copper-based metal organic framework material has Cu + and Ag + which can adsorb sulfides through π bond action, and has a large adsorption capacity and high adsorption selectivity for sulfides (such as mercaptans, sulfides, thiophenes, etc.) as a desulfurization adsorbent.

The invention relates to the technical field of land pollution treatment, solves the problem that in the prior art, when a large-area medium polluted by hexavalent chromium is treated, the addition amount of ferrous sulfide is prone to being inaccurate, and consequently the remediation effect is not ideal, and provides ferrous sulfide particles with shells and a preparation method and application of the ferrous sulfide particles. The prepared ferrous sulfide particles with the shells can keep efficient removal of chromium within the pH value range of 5-9, the problem that the adsorption behavior of a traditional model in a low-chromium-concentration area is difficult to predict is effectively solved by means of a correction adsorption model with higher fitting precision, and therefore the actual demand quantity of target repairing liquid can be accurately predicted, and the application prospect is wide. The target repairing liquid can be injected more accurately, and excessive or insufficient injection is avoided. After hexavalent chromium is reduced into trivalent chromium by ferrous sulfide, the trivalent chromium and carboxymethyl cellulose can form a stable chelate, and zero-valent sulfur can also form a compact passivation layer on the surface of a polluted medium, so that the trivalent chromium is prevented from being reoxidized, and long-term stable repair of hexavalent chromium is realized.

The application discloses modified 5A molecular sieves, a preparation method and application thereof. The preparation method of the modified 5A molecular sieves comprises the following steps: (1) placing 5A molecular sieves in an ammonia water solution to perform ultrasonic treatment, then washing, first drying, and first calcining to obtain H-5A type molecular sieves; (2) adding sodium lignosulfonate, hydroxyethyl cellulose, polyethylene glycol and carbomer into a hydrochloric acid solution to stir, and obtaining a mixed solution; (3) adding the H-5A molecular sieves into the mixed solution obtained in the step (2) to perform modification treatment, second drying and second calcining, and obtaining modified H-5A molecular sieves; and (4) placing the modified H-5A molecular sieves in a lithium salt solution to perform impregnation treatment, then performing third drying and third calcining, and obtaining modified 5A molecular sieves. The modified 5A molecular sieves have high adsorption capacity for ethane and propane, especially high adsorption and removal rates for ethane in VOCs, and good operation conditions.

The application discloses a phosphorus-carrying catalyst regeneration waste liquid recycling treatment method and device, and aims to solve the technical problem of how to better control the acidity of the regeneration liquid to maintain the service life of the phosphorus-carrying catalyst, realize the recycling of the regeneration liquid and the concentration reduction of the phosphorus resource, and reduce the treatment difficulty of the regeneration waste liquid. The method comprises the following steps: introducing the phosphorus-carrying catalyst regeneration waste liquid into an adsorption device filled with a regeneration waste liquid phosphorus removal adsorbent, separating the phosphorus component in the phosphorus-carrying catalyst regeneration waste liquid, collecting the effluent as a phosphorus-lean regeneration liquid, recycling the phosphorus-lean regeneration liquid for the regeneration of the phosphorus-carrying catalyst, and mainly using the phosphate as the phosphorus component; when the regeneration waste liquid phosphorus removal adsorbent is saturated, hot water is used as a desorption medium to replace the liquid in the adsorption device, the volume of the desorption medium is controlled to be less than the volume of the phosphorus-carrying catalyst regeneration waste liquid that can be contained in the adsorption device, and the regeneration waste liquid phosphorus removal adsorbent is eluted.

This invention relates to an electrochemical lithium-ion sieve-based lithium extraction apparatus and method, belonging to the field of electrochemical lithium extraction. The apparatus and method mainly comprise: a first end plate, a second end plate, and several electrolytic cell units assembled together. The electrolytic cell units are located between the two end plates. After brine and supporting electrolyte enter the electrolytic cell unit, due to the crisscrossing of the flow guide holes on the cathode and anode guide plates, the brine and supporting electrolyte flow to the cathode and anode respectively. Under the action of an electric field, lithium ions in the brine are absorbed by the lithium-deficient ion sieve on the cathode, transforming into lithium-rich ion sieves. Lithium ions from the lithium-rich ion sieve on the anode are released into the supporting electrolyte, transforming into lithium-deficient ion sieves. After draining the brine and supporting electrolyte, the apparatus is rinsed with pure water, and the brine and supporting electrolyte are exchanged, with the current direction changed, repeating the cycle to achieve selective extraction of lithium from the brine.

The utility model discloses a kind of treatment systems of dust-containing acid flue gas, enamel horizontal spray tower is multiple tower series connection, flue gas inlet and flue gas outlet are provided on the upper end of first and last enamel horizontal spray tower, enamel horizontal spray tower lower end is provided with liquid discharge port, the flue gas inlet of enamel horizontal spray tower is connected with pre-spray pipeline, liquid discharge port is connected to plate-and-frame filter press, alkali absorption tower and acid absorption tower lower end are each provided with flue gas inlet, top end is provided with flue gas outlet, the flue gas outlet of enamel horizontal spray tower is connected with alkali absorption tower inlet, alkali absorption tower flue gas outlet is connected with acid absorption tower inlet, the utility model is combined with on-line in situ adsorption and regeneration collaborative mechanism, through resin adsorption, the removal efficiency of acidic component is strengthened, the problem of high ammonia escape in traditional ammonia absorption technology is solved, with high denitration desulfurization efficiency (>95%), low operating cost, strong sulfur resistance, can long-period operation advantage.

This invention relates to a volatile organic compound (VOC) adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, followed by vanadium modification to obtain a Li-V-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.8%–4.5%, and the V content is 0.2%–1%. The adsorbent material obtained by this invention, using a 5A molecular sieve as a matrix and modified to obtain the Li-V-5A adsorbent material, has advantages such as good adsorption effect on low-carbon hydrocarbons and strong resistance to sulfur poisoning, especially high adsorption and removal rate of ethane.

This invention belongs to the field of iodine adsorption material technology, and discloses a method for synthesizing and applying a highly efficient iodine adsorption material. The synthesis method includes: S1, adding an organic aldehyde ligand to a container, adding a solvent, and stirring to completely dissolve the aldehyde ligand; S2, slowly adding the above solution dropwise to an organic amine ligand solution to completely mix it with the amine ligand; S3, sealing the above mixed solution and stirring at room temperature until the color deepens; S4, after the reaction is complete, separating the reaction solution into small glass vials, tightening the caps, loosening them by half a turn, and placing them in a protective atmosphere; after several days of gas-liquid diffusion, visible crystals form at the bottom of the glass vials. The synthesized adsorption material has applications in volatile and radioactive iodine. The crystalline adsorption material synthesized by this invention has good stability, high adsorption efficiency for iodine, and a fast adsorption rate, and can be used for nuclear waste treatment and the capture of radioactive iodine.

This invention relates to a method for preparing and using a biopolymer chitosan-modified magnetic sepiolite adsorbent. First, sepiolite (Sep) is co-precipitated with a magnetic core (Fe3O4) to magnetically modify it, yielding magnetic sepiolite (MSep). Then, chitosan (CTS) is extensively cross-linked onto the MSep surface using glutaraldehyde as a cross-linking agent, preparing a functionalized magnetic solid adsorbent (MSep@CTS) with a complete core-shell structure and abundant adsorption sites. Importantly, this material exhibits excellent adsorption performance for antimony ions and synergistic adsorption capacity for both Sb(III) and Sb(V) co-occurring in water. This "easy to obtain, easy to prepare, highly efficient, and clean" characteristic provides significant economic advantages and sustainable development potential while achieving high-performance adsorption, laying a solid foundation for large-scale practical applications.

The application discloses a kind of storage, handling link high concentration organic waste gas processing system, it is related to the field of organic matter containing waste gas treatment technology, including low-temperature solvent absorption system, activated carbon adsorption and desorption system and high-temperature oxidation treatment system, low-temperature solvent absorption system, activated carbon adsorption and desorption system and high-temperature oxidation treatment system are sequentially connected in series through waste gas delivery pipeline;The low-temperature solvent absorption system can absorb the organic matter in waste gas by low-temperature solvent, the activated carbon adsorption and desorption system can intermittently adsorb the organic matter in waste gas by activated carbon, and the activated carbon of the activated carbon adsorption and desorption system is desorbed in the interval between two adsorption actions.The application uses the technical means of low-temperature solvent combined with activated carbon to remove organic matter, replaces the low-temperature condensation link in conventional oil gas recovery process, and the whole system is more energy-saving and low in operating cost.

The application discloses a plant biomass cellulose-based boron adsorbent, which comprises a substrate and a ligand grafted on the substrate, the substrate is cellulose grafted glycidyl methacrylate synthesized based on plant biomass cellulose, and the ligand is selected from any one of N-methyl-D-glucose, tris(hydroxymethyl) aminomethane, glycidyl-functionalized ethylenediamine and aldehyde glucose. A preparation method comprises the following steps: obtaining plant biomass cellulose based on plant biomass material; using plant biomass cellulose and glycidyl methacrylate monomers as raw materials, synthesizing cellulose grafted glycidyl methacrylate by adopting an ATRP method; and grafting polyol ligands onto the cellulose grafted glycidyl methacrylate by a hydrothermal reaction, to obtain the plant biomass cellulose-based boron adsorbent. The synthesis method of the boron adsorbent is green and simple, the cost is low, the adsorption capacity is large, and the method is favorable for large-scale application.

The application discloses a preparation method of light water treatment granular material, and belongs to the field of water pollution purification material. The light water treatment granular material is prepared through preparation of titanium-zinc-calcium sol and granular shaping process, and the granular material has the characteristics of low density, rich porosity and stable structure, and is suitable for purifying and treating organic contaminated wastewater. Meanwhile, the granular material has a large adsorption capacity for organic pollutants in wastewater, and can spontaneously decompose the adsorbed organic pollutants, so that the granular material can not only quickly remove the organic pollutants from the wastewater, but also has a self-purification capacity, and is suitable for long-term stable and large-scale wastewater treatment process.

The application belongs to the technical field of biological medicine, and relates to a hemoperfusion adsorbent, a preparation method and application thereof. The hemoperfusion adsorbent is a microsphere structure, the carrier of the microsphere is a chitosan microsphere, the ligand is type I collagen, and the particle size of the microsphere is 250-1000 mu m. The hemoperfusion adsorbent provided in the application has the characteristics of large adsorption amount of bilirubin, high selective adsorption, small adsorption of albumin and the like based on the synergistic effect of collagen and chitosan, has excellent specific adsorption effect of bilirubin, is low in cost, and has good clinical application prospect.

The invention discloses a method for preparing amino phosphonic acid resin based on chloromethylation reaction, which comprises the following steps: carrying out chloromethylation reaction on polystyrene resin, paraformaldehyde, concentrated sulfuric acid and thionyl chloride in an organic solvent, and carrying out amination reaction on the obtained chloromethylated polystyrene resin and a diamine compound in trichloromethane to obtain the amino phosphonic acid resin. And mixing the obtained aminated resin with a formaldehyde solution and phosphorous acid, and carrying out phosphonation reaction to obtain the amino phosphonic acid resin. According to the method, polystyrene resin is used as a raw material, chloromethylation reaction is carried out in a novel chloromethylation system constructed by paraformaldehyde, concentrated sulfuric acid and thionyl chloride, the reaction rate and the reaction efficiency of chloromethylation can be effectively improved, amination and phosphonation reactions are carried out on the obtained chloromethylated polystyrene resin, and the yield of the polystyrene resin is improved. The preparation method has the advantages of simplicity in operation, low cost, high synthesis efficiency, environmental friendliness and the like, and industrial application of the amino phosphonic acid resin is conveniently realized.

The application belongs to the field of solid adsorbent compositions, and particularly relates to a preparation method of magnetic amino gel and application thereof. The magnetic amino gel is prepared by subjecting magnetic microspheres with amino, organic polyamine and N,N-methylene bisacrylamide to a Michael addition reaction in a solvent. The magnetic amino gel of the application solves the shortcomings of traditional adsorbents that are not easy to separate from water bodies and are difficult to recycle, and has a large adsorption capacity for anionic dyes and a high adsorption capacity of 650 mg / g or more for methyl blue.

The invention belongs to the technical field of oil exploitation, and particularly relates to an oil-based foam oil displacement system based on stability augmentation of high-temperature-resistant nano-particles and a preparation method and application thereof.The stability augmentation oil-based foam oil displacement system is characterized in that 0.5 wt%-1.5 wt% of nano-particles, 0.5 wt%-2 wt% of a nonionic surfactant Span20 and 0.1 wt%-1.0 wt% of a nonionic surfactant JQ-1 are adopted, the half-life period of foam drainage can be 15-22 min under the conditions that the pressure is 1 MPa and the temperature is 100 DEG C, and the stability augmentation oil-based foam oil displacement system is stable. And the half-life period of foam is 9-15 days. The stability-enhancing oil-based foam oil displacement system based on the high-temperature-resistant nano-particles is high in foaming capacity in an oil solvent, the surface tension of the oil solvent can be remarkably reduced, high foaming performance and foam stability are achieved, and the preparation process is simple, green and environmentally friendly.

The application relates to a preparation method of a magnetic lithium ion sieve coated with Fe-doped ZrO2, and relates to a preparation method of a lithium ion sieve. 3+ The application creatively adopts Fe-doping and ZrO2 coating to prepare the magnetic lithium ion sieve, simultaneously reduces the dissolution loss of manganese and iron by means of metal cation ion doping and coating, realizes efficient solid-liquid separation, greatly increases the service life of the lithium ion sieve, and is applicable to lithium extraction from various lithium-containing solutions due to the acid and alkali resistance of ZrO2. The method comprises the following steps: 1, preparing FO; 2, preparing LMFO; 3, preparing ZrO2@LMFO; and 4, preparing ZrO2@HMFO. The process is simple in preparation, the dissolution loss of manganese and iron tends to be stable in multiple cycles, the magnetic separation performance is good, the process is applicable to mass production, and is helpful to the industrialization progress of lithium extraction from salt lake brine.

The application provides an electrosorption material for electrochemically extracting bromine and a preparation method and application thereof. The electrosorption material comprises bismuth oxybromide nanosheets and polyethylenedioxythiophene loaded on the surface of the bismuth oxybromide nanosheets, and the mass ratio of the bismuth oxybromide nanosheets to the polyethylenedioxythiophene is 1-10:0.1-5. The electrosorption material provided by the application has a large adsorption capacity, good cycle stability and excellent selective adsorption. The electrosorption material still has adsorption capacity for a solution with a bromide ion content of less than 100 mg / L, and is suitable for extracting bromine in oilfield brine.

This invention provides a method for preparing a metal-organic framework adsorbent, belonging to the field of adsorbent technology. The invention includes the following steps: dissolving a metal ion salt and an organic ligand in an organic solvent, controlling the reaction temperature and time, centrifuging, washing, and vacuum drying to obtain the metal-organic framework adsorbent; the organic ligand contains one or two of amino, carbonyl, carboxyl, sulfonic acid, and hydroxyl groups; the adsorbent selectively adsorbs glucagon-like peptide-1 analogs. This invention synthesizes a metal-organic framework adsorbent by combining a metal ion salt with an organic ligand containing groups such as amino, carbonyl, carboxyl, sulfonic acid, and hydroxyl groups. It utilizes the charged portion or specific groups in the organic ligand to form hydrogen bonds, ionic bonds, van der Waals forces, and chelation with glucagon-like peptide-1 analog molecules, achieving highly efficient and selective adsorption of glucagon-like peptide-1 analogs, exhibiting high adsorption capacity, fast adsorption rate, and good adsorption stability.

This invention relates to a VOCs adsorbent material and its preparation method. The method involves first modifying a 5A molecular sieve with lithium, and then modifying it with titanium to obtain a Li-Ti-5A adsorbent material. Based on the total mass of the adsorbent material, the Li content is 0.65%–4.2%, and the Ti content is 0.15%–0.85%. The adsorbent material obtained by this invention is a Li-Ti-5A adsorbent material obtained by modification using a 5A molecular sieve as the matrix. This material has advantages such as good adsorption effect on low-carbon hydrocarbons and good thermal stability, especially with better adsorption effect on propane.

This invention discloses a thiol-functionalized polyvinyl alcohol (PVA) / sodium alginate (SA)@ZIF-67 composite hydrogel, its preparation method, and its applications. The preparation method uses PVA and SA as matrices, forming hydrogel spheres through ionic crosslinking. After adsorbing cobalt ions, thiol-functionalized ZIF-67 crystals are grown in situ in a mixed ligand solution containing 2-methylimidazole and 2-mercapto-1-methylimidazole to obtain the PVA / SA@SH-ZIF-67 composite hydrogel. This invention achieves efficient adsorption and integrated "adsorption-reduction-fixation" removal of Cr(VI) by introducing thiol-functionalized ZIF-67 into the hydrogel network, utilizing the strong coordination and chemical reduction effects of thiol groups on hexavalent chromium. This composite hydrogel has advantages such as large adsorption capacity, high removal efficiency, and easy separation and recovery, and has broad application prospects in the field of heavy metal wastewater treatment.

The invention relates to the technical field of purification of cold hydrogenated slurry high-boiling residues, and provides a modified coconut shell activated carbon adsorbent as well as a preparation method and application thereof. The modified coconut shell activated carbon adsorbent is characterized by comprising a coconut shell activated carbon substrate; the alkaline nitrogen-containing functional group is covalently bonded on the coconut shell activated carbon substrate. The alkaline nitrogen-containing functional group is stably loaded on the surface of the activated carbon in a covalent bond mode instead of simple physical impregnation, and efficient and high-selectivity adsorption is achieved through the acid-base coordination effect of the alkaline nitrogen-containing functional group and aluminum and titanium impurities. The preparation method of the modified coconut shell activated carbon adsorbent comprises the following steps: carrying out first reaction on a coconut shell activated carbon substrate and oxidizing acid to obtain oxidized coconut shell activated carbon; and carrying out a second reaction on the oxidized coconut shell activated carbon and an amine-containing compound to obtain the modified coconut shell activated carbon adsorbent. The method is simple in steps, mild in reaction conditions and easy to industrialize.

The invention relates to the field of environment-friendly and chemical materials, and discloses an adsorbent and a preparation method thereof. The preparation method of the adsorbent comprises the following steps: 1) molding a mixture containing FCC catalyst glue residues, an aluminum oxide source, an optional first metal chloride and a molding aid and a peptizing agent solution; (2) carrying out first roasting on the molded product obtained in the step (1) by taking the total weight of the FCC catalyst glue residue dry basis, the aluminum oxide source, the first metal chloride and the molding aid as a reference, the content of the FCC catalyst glue residue dry basis is 35-80wt%, the content of the aluminum oxide source is 15-60wt%, the content of the first metal chloride is 0-20wt%, and the content of the molding aid is 0-20wt%; and the content of the forming auxiliary agent is 1-10 wt%. The preparation method of the adsorbent provided by the invention is simple in preparation process and low in production cost, and the prepared hydrogen fluoride has excellent adsorption performance and is difficult to adhere and cake after being used.

The invention belongs to the technical field of ion exchange and high-purity chemical purification, and particularly relates to bifunctional modified ion adsorption resin as well as a preparation method and application thereof. A crown ether functional group and a hydroximic acid functional group are introduced after a macroporous cross-linked resin matrix is subjected to chloromethylation, and a functional adsorption site with cavity size selectivity and multidentate coordination capability is constructed at the same time. The crown ether functional group can generate a cavity coordination effect with sodium ions and potassium ions, so that the selective adsorption of the resin on monovalent metal ions is remarkably improved; the hydroximic acid functional group has strong chelating ability, and can form a stable complexing structure with calcium ions by means of multidentate coordination, so that efficient removal of divalent metal ions is realized. The bifunctional modified ion adsorption resin prepared by the invention shows remarkable selectivity on metal ions in ethyl lactate, can realize ppt-level adsorption, and is suitable for deep purification treatment of high-end electronic chemicals.

This invention discloses a highly crosslinked resin, its preparation method, and its application in the adsorption of 5-hydroxymethylfurfural. Using styrene as a monomer and chloromethylstyrene as a crosslinking agent, this invention prepares a highly crosslinked resin with high hydrophobicity and high specific surface area using the Davankov post-crosslinking method. The BET specific surface area of ​​the highly crosslinked resin of this invention is 810–1193 cm². 2 / g, with an average pore size of 2.043–2.601 nm and a micropore volume of 0.159–0.328 cm³. 3 / g. The highly cross-linked resin exhibits high adsorption performance and selectivity for 5-hydroxymethylfurfural, with a maximum adsorption capacity of 182.3 mg / g. It reaches equilibrium within 30 minutes of adsorption and demonstrates good elution and recyclability of the adsorbed 5-hydroxymethylfurfural, enabling efficient adsorption and separation of 5-hydroxymethylfurfural.

The application provides a three-dimensional multi-stage hole phosphonated chitosan / microalgae-based aerogel and a preparation method and application thereof, and belongs to the technical field of aerogel preparation. The three-dimensional multi-stage hole phosphonated chitosan / microalgae-based aerogel (aCSP / CP) is prepared by taking chitosan (CS), phosphonated chitosan (CSP) and chlorella pyrenoidosa powder (CP) as raw materials. The selectivity of CP to U(VI) is low, but the total ion adsorption capacity is higher, and more coexisting ions can be adsorbed. The selectivity of CSP to U(VI) is greatly improved. The high affinity and high selectivity between the phosphorus functional groups in CSP and U(VI) can improve the selective adsorption of U(VI). In the application, CP and CSP synergistically act together to realize the high selective adsorption of U(VI).