644results about How to "High adsorption selectivity" patented technology

The invention discloses a method for preparing a manganese series lithium ion sieve adsorbent, and relates to a method for preparing an inorganic adsorbent for adsorbing lithium from liquid lithium resources such as brine of salt lake, seawater and the like. In the method, a cubic crystal ion sieve precursor Li1.6Mn1.6O4 is prepared from Mn2O3 and LiOH or Li2CO3 serving as raw materials by using two sections of solid-phase reactions, wherein the precursor also can be used as an anode material of a lithium ion battery. The precursor is acidized to obtain a lithium ion sieve adsorbent MnO2.0.5H2O (or expressed as H1.6Mn1.6O4), and the ion sieve is the lithium adsorbent which has high selectivity on lithium. The method has the advantages of simple and readily available raw materials, simple process, high adsorption capacity of the ion sieve, low cost, high purity of products and is easy to realize industrial production.

The invention aims to provide a preparation method and application of a porous nano metal organic framework material, and is characterized in that the preparation method comprises the steps: adding a metal ion, an organic ligand, a surfactant and a nanocrystalline guide agent or a reagent forming the nanocrystalline guide agent into a growth medium, forming a framework structure through chemical complexation, crystallizing, filtering, washing, drying, and finally obtaining the porous nano metal organic framework material. The addition amount of the surfactant is 0-30% of the molar concentration of the metal ion; the metal ion is one or more of Cu<II>, Al<III>, Mg<II>, Fe<III>, Ni<II>, Co<II> and Zn<II>; the organic ligand has at least one atom independently selected from oxygen, sulfur and nitrogen and can be subjected to coordinated complexation to the metal ion through the atom. The method not only can effectively suppress the size of MOFs materials, but also easily improves size homogeneity and synthetic efficiency of the product.

The invention relates to a preparation method of a mesoporous X-type molecular sieve and a method for preparing an adsorbent by using the molecular sieve as an active component. The prepared adsorbent based on the mesoporous X-type molecular sieve is used as a paraxylene adsorptive separation adsorbent. The method for preparing the mesoporous X-type molecular sieve comprises the following steps: by using water glass as a silicon source and aluminum hydroxide as an aluminum source, adding a template, and carrying out hydrothermal synthesis to obtain the mesoporous X-type molecular sieve. The mesoporous molecular sieve and kaolin are proportionally molded to obtain 0.3-0.8mm granules, and the granules are subjected to barium ion or (and) potassium ion exchange until the exchange degree is greater than 99%, thereby obtaining the adsorbent which has excellent adsorptive separation capacity for paraxylene in C8 aromatic hydrocarbons. Compared with the prior art, the active component mesoporous X-type molecular sieve of the adsorbent, which is prepared by using the template, has the crystal form structure of the X-type molecular sieve and the pore distribution of the mesoporous and microporous dual models; the mesoporous pore size distribution is 2nm or so; and thus, the problem of overlow mass transfer rate in the adsorbent can be solved.

The invention discloses a preparation method of amidoxime group uranium extraction sorbent, comprising the following steps: firstly, adopting polyacrylonitrile powder as a raw material, producing uranium extraction sorbent containing amidoxime group by amidoximation; adding titanium dioxide sol which is prepared by the sol-gel method for blending to ensure that the weight percent of titanium dioxide and polyacrylonitrile is 0.4-2.0%; producing hybridized amidoxime group uranium extraction sorbent by water washing, alcohol washing and drying. The invention has the advantages that the amidoxime group uranium extraction sorbent material which is hybridized with titanium dioxide has higher mechanical strength, higher adsorption quantity of uranium, and higher adsorption selectivity to uranium in the presence of calcium and magnesium ions.

Provided are a method for advantageously producing iron oxyhydroxide exhibiting excellent adsorbing capability for harmful substances, such as a phosphorus component and an environmental hormone, in an industrial waste water and an exhaust gas; and an adsorbing material comprising the iron oxyhydroxide produced by the method as a main component. Specifically, provided are a method for producing iron oxyhydroxide, characterized in that it comprises: (a) a step of adding a base to an aqueous solution containing an iron ion so as for the resultant mixture to have a pH of 9 or less, to thereby form a precipitate containing iron oxyhydroxide, (b) a step of drying the above precipitate at a temperature of 100 DEG C or lower, to thereby prepare iron oxyhydroxide, (c) a step of contacting the resultant iron oxyhydroxide with water, and (d) a step of subjecting the resultant iron oxyhydroxide to a heating treatment in a gas atmosphere having an inert gas concentration of 80 % or more at a temperature of 100 to 280 DEG C; and an adsorbing material comprising the iron oxyhydroxide produced by the method as a main component.

The invention relates to a composite type mercury ion adsorbent and a preparation method thereof. The adsorbent consists of chitosan, polyvinyl alcohol and clay. A polyvinyl alcohol macromolecular chain and a chitosan macromolecular chain are penetrated and wound mutually by high-speed stirring, so that the inorganic clay is dispersed fully; and the release of the chitosan and the polyvinyl alcohol in the process of using the adsorbent is avoided effectively by a method of combining cross linking agent cross linking and freezing crossing linking of glutaraldehyde. The adsorbent has high adsorption capacity and high adsorptive selectivity on Hg(II) ions, hardly adsorbs Cd(II) and Pb(II) ions, and adsorbs a small amount of Cu(II) ions, and can be recycled, and adsorbability of the adsorbentis slightly influenced by the pH value of a solution. The integral preparation process is performed in an aqueous solution, the preparation method is simple and convenient, low in energy consumption,low in production cost, environment-friendly, and easy to industrialize, and special process equipment is avoided.

The invention discloses a high selectivity moisture absorber with a shell-core structure and a method for preparing the same. The moisture absorber is an organic-inorganic composite adsorbent which takes an inorganic porous material the surface of which contains a hydroxyl group as an inner core and a hydrophilic polymer ultra-thin film as a shell, wherein by the condensation and polymerization reactions, the shell is grafted with a hydrophilic polymer brush on the surface of the inner core; and further by the cross linking, the hydrophilic polymer ultra-thin film shell is formed. The preparation method comprises the following steps: firstly, the inorganic porous material the surface of which contains the hydroxyl group is subjected to activating treatment and then subjected to hydrolytic condensation with a silane coupler to form an inorganic porous material containing vinyl; and the inorganic porous material containing the vinyl is subjected to free radical polymerization reaction with an acrylic monomer and then is subjected to cross linking reaction with a diamine compound so as to obtain the high selectivity moisture absorber with the shell-core structure. Compared with prior art, the moisture absorber has the advantages of high selectivity, large hygroscopic capacity, simple preparation process, low cost and easy control of selectivity, and can meet the requirements of different application occasions.

The invention discloses a method for preparing chondroitin sulfate and collagen polypeptide from animal cartilages, which comprises the following steps: crushing animal cartilage materials to obtain cartilage powder; hydrolyzing the cartilage powder with protease, and then carrying out ultrafiltration and concentration to obtain a concentrated solution; passing the concentrated solution through an anion exchange resin column, and collecting an effluent solution A; eluting with pure water, and collecting a water washing solution B; merging the effluent solution A and the water washing solution B, carrying out ultrafiltration and concentration, and carrying out spray drying to obtain the collagen polypeptide; and eluting the anion exchange resin column with an NaCl solution, carrying out ultrafiltration and concentration on the eluent solution, carrying out alcohol precipitation, dehydrolyzing, and drying to obtain the chondroitin sulfate. The invention realizes the high-valued utilization of cartilage resources, can simultaneously and efficiently extract and separate the chondroitin sulfate and the collagen polypeptide, increases the added values of the products and reduces the environment pollution.

The invention relates to a novel amino hybrid SiO2 aerogel material and an application thereof. The novel amino hybrid SiO2 aerogel material is prepared by the method comprising the steps of firstly, uniformly mixing all reactants, and then putting the mixture into a drying oven for gelling; after aging of a wet gel, performing solvent replacement and supercritical drying to obtain an amino hybrid SiO2 aerogel, wherein the amino hybrid SiO2 aerogel can be used for CO2 adsorption. The obtained amino hybrid organic aerogel is subjected to CO2 adsorption application study. The method is simple in process and easy in industrial production, and the prepared material is large in adsorption capacity and good in selectivity to CO2 gas and has good circulating stability. The technology has an application value in the aspect of energy conservation and emission reduction.

The invention provides ultrahigh cross-linked macro-porous adsorption resin which is obtained by taking a styrene monomer as a functional monomer, taking a multi-vinyl monomer as a cross-linking agent, suspending and polymerizing in the presence of a pore forming agent to obtain low-cross-linked macro-porous polystyrene white ball, reacting the obtained white ball with chloromethyl ether under the catalysis of lewis acid to obtain chloromethylation macro-porous polystyrene resin, and carrying out a Friedel-Crafts alkylation reaction on the obtained chloromethylation macro-porous polystyrene resin in the presence of a swelling agent by taking the lewis acid as a catalyst. Through adopting a novel cross-linking agent and pore forming agent system, the obtained resin has the advantages of high specific surface area and uniform pore diameter; the specific surface area is up to 1500-1800m<2> / g, the pore diameter distribution is uniform, a pore channel is dense and the average pore diameter is small; the pore diameter of the obtained macro-porous resin is rightly applicable to removal of patulin in juice and the removing efficiency is high; the resin can be used for pointedly removing the patulin which stably exists in the juice and the potential hazards on the human health, caused by the patulin in the juice, are solved; the ultrahigh cross-linked macro-porous adsorption resin has great social and economic benefits.

The invention discloses an N-acetylethylenediamine chelate resin and a preparation method thereof, belonging to the field of chelate resin. The constructional unit is shown in the specification, wherein the functional group is N-acetylethylenediamine; and the content of the functional group is 0.71-1.39mmol / g. The preparation method of the resin comprises the following steps: preparing a white ball; preparing a chlorine ball; extracting the chlorine ball through a soxhletextractor; then taking N,N-dimethylformamide as sweller, adding 2-aminothiazole-4-ethyl acetate potassium carbonate, and stirring for reaction to obtain faint yellow 2-aminothiazole-4-ethyl acetate based resin; washing the obtained resin; adding ethylenediamine solution; condensing and reacting; and filtering and drying to obtain the N-acetylethylenediamine chelate resin. The resin provided by the invention can selectively adsorb and separate heavy metal ions, such as Cu<2+> and the like, has wide applications in the fields of mining and metallurgy production mother solution extraction, production waste water management, heavy metal separation and preenrichment in the environmental analysis and the like.

The invention discloses a process for hypercritical extraction of grape seed oil and resin adsorption abstraction of proanthocyanidin, which comprises, employing hypercritical carbon dioxide to extract grape seed oil from comminuted grape seeds under abstraction pressure of 20-35MPa at 40-50 deg. C, heating degreased grape seeds with 25-35% water solution of ethanol for backflow, charging 50-70% ethanol or isopropanol solution into the concentrated extract liquid, agitating and stewing, decompressing and filtering, thus obtaining proanthocyanidin crude extract liquid, then adsorbing with polystyrene resin, carrying out desorption with desorbent after adsorption saturation, drying the eluent under reduced pressure, finally obtaining refined proanthocyanidin product.

A blood purification sorbent for antibody removal belongs to the technical field of biomedicine, which consists of the two parts of solid-phase carrier material and a petunidin fixed on the carrier by chemical coupling. The molecular structure of the petunidin is shown as above, wherein, one atom among A, B and C is N, the others are C; n is 0-2. The blood purification sorbent can adsorb the antibody component in plasma and autoantibodies such as rheumatoid factor, antinuclear antibody, etc. in heavy load, has limited nonspecific adsorption to other plasma components such as seralbumin, etc., and also has low preparation cost and stable physicochemical property. The material can be used as adsorption filler of a blood purification device for removing the autoantibody and immune complex in the plasma.

The invention discloses a preparation method of ion imprinted hydroxamic acid chelate resin. According to the invention, propenyl hydroxamic acid is subjected to coordination with imprinting metal ions such as manganese, copper, cobalt, nickel, lanthanum, cerium, yttrium, praseodymium, neodymium, and the like; under the effects of a crosslinking agent and an initiating agent, a propenyl hydroxamic acid-metal ion chelate is polymerized; and the imprinting metal ion is eluted, such that the ion imprinted hydroxamic acid chelate resin is obtained. The method provided by the invention has the advantages of mild reaction condition and high reaction efficiency. The prepared resin has the advantages such as high absorption capacity, high absorption selectivity, and the like.

The invention discloses a preparation method and an adsorption method of a Ni<2+> adsorbent. The method comprises the following steps: (1) with tetraethoxysilane as a silicon source and triblock copolymer (P123, EO20PO70EO20) as a template agent, synthesizing a silica-based mesoporous material SBA-15, and modifying the inner surface of the silica-based mesoporous material SBA-15 with 3-aminopropyl triethoxy silane (APTES) through an alkyl coupling method to obtain an amino functionalized silica-based mesoporous material NH2-SBA-15; (2) grafting amino acid onto NH2-SBA-15 by a post-transplantation method to obtain the amino acid modified silica-based mesoporous material, namely, the adsorbent; (3) regulating the pH value of the adsorbent to 3-5 by virtue of a water solution containing Ni<2+>, and feeding the adsorbent to adsorb Ni<2+> in a water body, wherein the mass ratio of the adsorbent to Ni<2+> in the water body is 5:1 to 8:1, the adsorption temperature is 20-30 DEG.C, and the adsorption time is 10-30 minutes. The adsorbent preparation method is high in operability and good in reproducibility, the obtained amino acid modified silica-based mesoporous material has a good removal effect for heavy metal ions, Ni<2+>, in a water body, the equilibrium adsorption capacity of the adsorbent reaches up to 60mg.g<-1> above, and thus the actual application value of the adsorbent is good.

The invention discloses a method for separating ethylene and acetylene from a mixed gas. The method comprises the step of using a metal organic frame material as an adsorbent for separating the ethylene and the acetylene from the mixed gas containing the ethylene and the acetylene; the metal organic frame material has a structural formula of M(C7O5H4).2H2O, wherein M is a metal ion, and the metalorganic frame material is a three-dimensional network structure formed by coordination bonds or intermolecular forces from a transition metal ion or alkaline earth metal ion and gallic acid. The metalorganic frame material has a large adsorption capacity for the acetylene and an excellent selectivity for adsorption and separation of ethylene / acetylene. The materials for the synthesis of the material is cheap and easy to obtain, the material preparation process is simple, and the cost is low; and the material has good regeneration and repetition performance, can still maintain the original adsorption effect after vacuum or heating regeneration, and has broad industrial application prospects.

The invention discloses a preparation method of a hybrid film adsorbent for removing heavy metal ions in water. The preparation method is characterized in that: in an inert atmosphere or in air, at 0 ~ 150 DEG C, a crosslinking agent as a reactant is added into a polyvinyl alcohol water solution with the mass percent concentration of 0.1% ~ 10%, and the mass ratio of polyvinyl alcohol: crosslinking agent is 1:0.01 ~ 0.1, under the effects of a dilute acid with the molar concentration of 0.001-0.1M, a cross-linking reaction is performed to obtain a solution, a silane coupling agent is added into the solution, and the mass ratio of polyvinyl alcohol (PVA): silane coupling agent is 1:0.1-1.0, a sol-gel reaction is performed to obtain a product, the product is statically stood for defoaming, and then is coated with a film to obtain a film sheet, and the obtained film sheet is dried to obtain the hybrid film adsorbent for removing the heavy metal ions in the water. The hybrid film adsorbent prepared by the preparation method is good in film forming performance, has strong adsorption selectivity to Pb<2+>, Cu<2+> and other heavy metal ions in the water, and can be used for adsorption and removal of the heavy metal ions in the water.

The invention provides a preparation method of a nitrogen doping carbon nanometer fiber adsorption material for carbon dioxide adsorption separation. The method is characterized by comprising the following steps of 1, at room temperature, firstly adding nitrogen-containing compounds into a solvent to be stirred for 1 to 5h to obtain a solution or dispersion solution; then, adding precursor polymers of the carbon nanometer fiber into the solution or the dispersion solution; performing stirring until the complete dissolution to obtain electric spinning raw materials; 2, performing electrostatic spinning on the electric spinning raw materials obtained in the first step, and obtaining nitrogen-containing hybridization nanometer fiber materials; 3, performing carbonization treatment; 4, performing activation treatment to obtain the nitrogen doping carbon nanometer fiber adsorption material for carbon dioxide adsorption separation. The carbon nanometer fiber adsorption material obtained by the method provided by the invention has the advantages of good adsorption volume, high selectivity and circulation stability; the prepared nanometer fiber has good softness and mechanical intensity; the operability is high; the carbon dioxide capture requirements in different discharging places can be met.

The invention discloses primary diamido chelating resin and a preparation method thereof and belongs to the field of chelating resin waste water treatment. A constitutional unit of the primary diamido chelating resin is as follows as shown in the specification. The chelating resin has a certain space structure, and primary diamido groups of the resin has special adsorptive selectivity to copper ions.

The invention provides a preparation method and a using method for polyamino / amidoxim-modified multifunctional ion exchange fibers. Polyacrylonitrile fibers used as a base material are sequentially grafted with a polyamino group and an amidoxim group through a hydrothermal process to prepare the polyamino / amidoxim-modified multifunctional ion exchange fibers. The chelation property of effective functional groups and metal ions is used to treat conventional metal element, nonmetal element or radioactive element wastewater. The preparation method and the using method are simple, the graft ratioof functional groups is high, and the prepared multifunctional ion exchange fibers have the advantages of stable performances, good hydrophilicity, high radiation resistance and high adsorption capacity. The problems of swelling-shrinkage and cracking of resin, silica gel and other traditional materials in different pH environments are avoided.

The invention relates to a method for preparing chitosan-ferric oxide composite absorption arsenic removal material, belonging to the technical field of water treatment. Based on the preparation of chitosan aquogel, gel balls of the chitosan aquogel are taken as matrix which is loaded with ferric oxide, and crosslinking treatment is carried out, so that the novel organic and inorganic composite material which is the chitosan-ferric oxide composite absorption arsenic removal material can be obtained. The composite absorption arsenic removal material has large adsorption capacity, high adsorption efficiency, strong adsorption selectivity and acid resistance as well as convenient solid-liquid separation, thus being an environment-friendly material which can be easily obtain and has low price and better application prospect.

The invention relates to an adsorption method for preparing soybean lecithin. Granulesten is taken as a raw material, C1-C4 alcohol is taken as a solvent, an adsorbent is added, the mixture is stirred, adsorbed and filtered, filtrate is subjected to desolvation under reduced pressure and vacuum drying to form a soybean lecithin product with over 80 percent of phosphatidylcholine, and the yield is over 85 percent. Compared with the conventional preparation method, the direct adsorptive separation technology has the advantages of simple process, short production period, high product purity, low consumption of solvent, simple equipment, low investment cost and the like, and is suitable for large-scale industrial production.

The invention discloses a method of deeply purifying heavy metal micro-polluted water body through resin-based nano hydrated ferric oxide, which pertains to the technical field of water environmental treatment. The steps are: nano hydrated ferric oxide granules are supported on cation exchange resin so as to generate the resin-based nano hydrated ferric oxide materials; the water micro-polluted by the heavy metal passes through an absorption column which is filled with the resin-based nano hydrated ferric oxide or the heavy metal micro-polluted water and the resin-based nano hydrated ferric oxide are mixed in a container and then are vibrated before being centrifugally dried; the absorbed resin-based nano hydrated ferric oxide can be desorbed by acid fluid such as HC1or HNO3 solution etc. or can be desorbed and regenerated by EDTA solution. When a great number of cations such as Na<+>, k<+>, Ca<2+>, Mg<2+>, etc. exist in the polluted water, the invention still can reduce and lead the effluent heavy metal concentration to meet safety control standard; when a great number of competitive cations coexist in the heavy metal micro-polluted water, the effluent heavy metal concentration can be reduced to meet the safety control standard with very large treatment capacity.

The invention relates to an adsorbent for deep desulfurization of materials containing C4 olefin, a preparation method and application thereof. The adsorbent for desulfuriztion consists of reduced VIII transition metal, reduced IB transition metal and IIB transition metal oxide which activate sulfur-containing molecules, and adhesive taking alumina as a main component. The adsorbent can adsorb nearly all sulfur compounds in the materials containing C4 olefin to get the materials containing C4 olefin with sulfur content lower than 5ng / mu l.

The invention relates to an ultra-deep combined desulphurization method for full-fraction FCC gasoline. The method comprises the following steps: (1) with full-fraction FCC gasoline and hydrogen as raw materials, successively contacting the raw materials with a protective agent 1, a protective agent 2 and a selective dialkene removing catalyst in a dialkene removing reactor under proper operation conditions to remove the most of dialkene in the full-fraction FCC gasoline raw material; (2) contacting the full-fraction FCC gasoline having undergone dialkene removal in step (1) with a catalyst in a selective hydrodesulfurization reactor under proper operation conditions so as to remove 40 to 60% of sulfur in the full-fraction FCC gasoline; and (3) subjecting the full-fraction FCC gasoline having undergone selective hydrodesulfurization in step (2) to separation in a gas-liquid separator and gas stripping to remove hydrogen sulfide dissolved in the full-fraction FCC gasoline, then mixing the full-fraction FCC gasoline with fresh hydrogen and contacting the full-fraction FCC gasoline with a catalyst in an adsorption ultra-deep desulphurization reactor under proper operation conditions so as to remove the most of sulfur in the gasoline, thereby obtaining a gasoline product with ultra low content of sulfur. The method has the advantages of low loss of an octane value, high liquid yield, high adsorptive selectivity of an adsorbent, great sulfur capacity and the like while carrying out ultra-deep desulphurization.

The present invention relates to the process of extracting capasaicin from chili fruit or peel and preparing natural capsaicin crystal. Capsaicin is obtained through organic solvent extraction of thespicy component from chili fruit or peel, depressing concentration and separation and purification with macroporous adsorption resin. Liquid chromatographic test shows that the extract has total content of capsaicin and dihydrocapsaicin up to 33%. Re-crystallizing the macroporous adsorption resin purified extract may obtain natural capsaicin crystal with capsaicin, dihydrocapsaicin and nordihydrocapsaicin in the total content up to 97%.

The invention relates to a gasoline desulfurization adsorbent and preparation and application thereof. A preparation method of the gasoline desulfurization adsorbent comprises the following steps of: mixing a zinc salt, a VIII family non-precious metal salt, other salts and a precipitant in a proton-containing polar solvent, and undergoing a precipitation reaction at the temperature ranging from the room temperature to 15 DEG C to obtain a sulfur storing agent; and soaking a soluble salt containing a VIB and / or VIII family transition metal into a molecular sieve carrier containing gamma-Al2O3to obtain an octane number restorative, wherein the gasoline desulfurization adsorbent comprises 5-50 percent by mass of molecular sieve, 5-80 percent by mass of zinc oxide, 1-30 percent by mass of VIB and / or VIII family non-precious metal and 5-50 percent of other bonding agents; the sulfur storing agent and the octane number restorative can be combined for using by mixing, soaking, performing deposition sedimentation and co-precipitating, and can be used separately; and the absorbent can be used for adsorbing almost all sulfides in gasoline to obtain ultra-low-sulfur even sulfur-free gasoline while the octane number is kept to be constant or be increased slightly.

The invention discloses an adsorption resin with concentrated aperture and larger micro-hole area compared with a superficial area and a preparation method of the adsorption resin. The resin apertures are concentrated and distributed in the area of 1.5-2.5nm; the micro-hole proportion is more than 60%. The preparation method of the resin has the steps as follows: (1) synthesis of narrow distribution micro-hole low crosslinking polystyrene resin; (2) chloromethylation of the narrow distribution micro-hole low crosslinking polystyrene resin under the catalysis of lewis acid catalyst; (3) subsequent crosslinking reaction of chloromethylated low crosslinking polystyrene resin under the catalysis of lewis acid catalyst. The microporosity of the resin prepared by the invention achieves 60-95%; the micro-hole has uniform distribution and has obvious single peak characteristic and obvious separation effect on the organic matters with identical chemical structure type and different molecule sizes, and can be effectively used for disposing and recycling corresponding organic wastewater. The reagent used by the method provided by the invention is relatively simple and easy to buy, and the required equipment is simple and easy.

The invention discloses an ammonia nitrogen adsorbent and a preparation and application method thereof. The method comprises the following steps: loading transition metal ions Cu<2+>, Zn<2-> and the like on cation exchange resin to form cation exchange resin loaded with transition metal ions; using cation exchange resin loaded with transition metal ions as the ammonia nitrogen adsorbent to remove ammonia nitrogen in wastewater through ion exchange; after adsorption, using hydrochloric acid or sulphuric acid to desorb the saturated resin and regenerate the resin, wherein ammonia enters the solution in ammonium chloride or ammonium sulfate form; and evaporating and crystallizing the desorption solution to obtain ammonium chloride and recycling ammonium chloride. The ammonia nitrogen adsorbent of the invention has high adsorption capacity, stable adsorption capacity and convenient regeneration method; as the ammonia nitrogen adsorbent of the invention is used to treat ammonia nitrogen wastewater, the defects of cost and denitrification efficiency in the blow-off method, the biological denitrification method, the zeolite adsorption method and the chemical precipitation method are overcome; and the technology is simple, economical, efficient and environmentally friendly and is applicable to the treatment of ammonia nitrogen wastewater.

The invention discloses a composite carbon dioxide adsorption material, which includes an in-situ synthesized MOFs(metal-organic frameworks)-graphite based composite material and organic amine loaded on the MOFs-graphite based composite material. The mass ratio of the MOFs-graphite based composite material to the organic amine is 0.1-10:1. The composite carbon dioxide adsorption material provided by the invention realizes the combined action of physical adsorption and chemical adsorption, can adsorb and store carbon dioxide at medium and low temperature, and realizes regeneration and reuse of the adsorbent under certain conditions. The composite carbon dioxide adsorption material has good adsorption capacity, high selectivity and cycling stability on carbon dioxide, and can overcome the disadvantages of easy volatilization and easy corrosion of equipment in organic amine so as to meet the industrial processing requirements. The invention also discloses a preparation method of the composite carbon dioxide adsorption material and application in adsorption of carbon dioxide in flue gas.