26results about How to "Highly selective adsorption" patented technology

The present application belongs to the technical field of high-value utilization of mineral resources and water treatment adsorption separation materials, and relates to a sepiolite-based lithium ion imprinting polymer, a preparation method and application in adsorption and separation of lithium ions in low-grade brine. The sepiolite is activated and pretreated, mixed with a lithium ion template, a functional monomer, a crosslinking agent and an initiator in a solvent system, and then subjected to a polymerization reaction, elution of the template ion, filtration, washing and drying to obtain the sepiolite-based lithium ion imprinting polymer. The sepiolite-based lithium ion imprinting polymer has good structural stability, lithium ion recognition selectivity and cyclic regeneration performance, and is suitable for efficient enrichment and separation of lithium ions in low-grade brine.

The application relates to a COF adsorbent for efficiently and selectively recovering Pb (II) and application thereof, and belongs to the field of high-efficiency adsorbents for adsorbing heavy metals and high-sensitivity electrochemical sensors. A Schiff base reaction occurs between benzene [1,2-b:3,4-b':5,6-b'] trithiophene-2,5,8-trialdehyde (BTT) and 3,3'-dihydroxybenzidine (DHBD) to obtain BTT-DHBD-COF, which has excellent adsorption performance on Pd (II), and the adsorption capacity can reach 570.7 mg / g after 10 min of adsorption; the detection limit of BTT-DHBD-COF / GCE on Pb (II) is 3*10 ‑12 mol L ‑1 .

The invention discloses a preparation method of a carboxyl magnetic starch material, and belongs to the technical field of food safety. The material is prepared by performing enzymolysis on corn starch to form pores, catalyzing sodium hypochlorite to oxidize by TEMPO to introduce carboxyl, and compounding with Fe3O4 (at) SiO2 magnetic nanoparticles. The preparation method comprises the following steps: pretreating ferric oxide to prepare magnetic particles, carrying out enzymolysis on corn starch, carrying out oxidation modification and carrying out water-phase compounding. The material can efficiently adsorb food-borne heterocyclic aromatic amine, the content and peroxide value of heterocyclic aromatic amine in repeatedly used marinating soup or fried vegetable oil are reduced, high-selectivity capture and magnetic separation recovery are achieved, and the material has the advantages of being economical and environmentally friendly.

The invention provides a carbonized resin decolorizing and refining method for mixed dibasic acid dimethyl ester, and belongs to the technical field of chemical separation and purification. According to the technical scheme, spherical carbonized resin formed by carbonizing styrene-divinyl benzene polymer resin is used as an adsorbent, and a colored crude product DBE is subjected to decoloration treatment through a fixed bed process. The carbonized resin has extremely high selective adsorption capacity and adsorption rate on colored impurities in DBE, the Pt-Co color number of the carbonized resin can be reduced from 50 or above to 10 or below, the decolorization rate exceeds 80%, and meanwhile the yield of the DBE product reaches 99% or above. And the resin saturated by adsorption is easy to regenerate and can be repeatedly used. The method is simple in process, efficient and environment-friendly, overcomes many defects of a traditional activated carbon decoloration method, and is particularly suitable for industrial refining production of DBE.

The invention relates to the technical field of conjugated microporous polymer materials, and discloses a covalent triazine unit-based conjugated microporous polymer membrane with negative charges and a preparation method thereof. The method comprises the following steps: firstly, preparing a negatively charged cyanophenyl monomer through nucleophilic substitution reaction of a cyanophenyl-containing compound and 1, 4-butane sultone, then taking the monomer and biphenyl nitrile as comonomers, and carrying out step-by-step polymerization, heating film formation, shock cooling shaping and dual-solvent soaking post-treatment under the catalysis of trifluoromethanesulfonic acid to obtain the cyanophenyl-containing polymer film. And finally obtaining the covalent triazine unit-based conjugated microporous polymer membrane with negative charges. The preparation process is high in controllability, and the obtained film has high stability of a covalent triazine structure and the porous characteristic and negative charge function of conjugated micropores, and has wide application prospects in the fields of gas separation and the like through verification.

The present application relates to adsorption separation of bisphenol A and 2,4-bisphenol A adsorbent and its adsorption separation process; the adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of the contained silicon oxide and aluminum oxide is 2.5:1-15:1, the contained rare earth metal is one or a combination of multiple of lanthanum, cerium, scandium and yttrium, the content of rare earth metal is 10:1-1000:1 in terms of the molar ratio of silicon and rare earth metal, and the rare earth metal exists in the form of metal ions. The adsorption separation process is to contact the mixture containing bisphenol A, 2,4-bisphenol A, triphenol and chroman in the crystallization mother liquor with the adsorbent in the adsorption separation reactor to carry out adsorption separation, and the obtained bisphenol A and 2,4-bisphenol A after adsorption separation enter the isomerization reaction unit; the obtained triphenol and chroman after adsorption separation enter the cracking reaction unit. Phenol is used as the eluent, has strong affinity with the adsorbent, and the elution efficiency reaches more than 95%.

The application discloses a kind of distiller's grains biomass-based modified adsorption hydrogel and its preparation and application.It includes the following steps: step one: take non-water soluble distiller's grains organic matter;Step two: the non-water soluble distiller's grains organic matter is dissolved, and organic matter solution is obtained;Step three: modifier is added to organic matter solution, and mixed liquor is obtained;Step four: gel component is added to mixed liquor, and initiator, crosslinking agent and plasticizer are further added, and gel crude product is obtained;Step five: gel crude product of step four is placed in refrigerator freezing, and after taking out, it is thawed at room temperature, and gel is obtained;Step six: the gel of step five is soaked in ethanol, then the surface residual uncrosslinked component is rinsed with water, and surface moisture is absorbed, and final product is obtained.The hydrogel material has the characteristics of simple preparation process, low cost, biodegradable, strong heavy metal adsorption capacity, good cycle stability, and waste utilization of distiller's grains, which to some extent alleviates the problem caused by inventory distiller's grains.

The invention belongs to the field of material chemistry, and discloses a nitrogen-doped zinc-based adsorbent, a preparation method of the nitrogen-doped zinc-based adsorbent and application of the nitrogen-doped zinc-based adsorbent in radioactive cesium removal, and the preparation method of the nitrogen-doped zinc-based adsorbent comprises the following steps: step 1, preparing a ZIF-8 precursor with a dodecahedron structure; step 2, preparation of HNZOR or HNZSS: dispersing the ZIF-8 precursor obtained in the step 1 in a solvent, carrying out a low-temperature hydrothermal reaction at 150-200 DEG C, collecting a product after the reaction is completed, washing and carrying out vacuum drying to obtain HNZOR; the preparation method comprises the following steps: dispersing HNZOR in water, carrying out secondary low-temperature hydrothermal reaction in an ammonium hydroxide environment at 120-180 DEG C, collecting a product after the reaction is completed, washing and carrying out vacuum drying to obtain HNZSS; and 3, activating the HNZOR or HNZOR obtained in the step 2 by using potassium salt containing K < + >, and after activation is completed, washing and drying to obtain the nitrogen-doped zinc-based adsorbent. The adsorbent disclosed by the invention can be widely applied to removal and enrichment of Cs < + > in nuclear power plant wastewater, accident emergency water bodies and high-salt complex waste liquid.

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 application relates to a preparation method of cobalt-modified polyheptazine imide and application thereof in rhodamine B photosensitization detection of paracetamol, and relates to the technical field of visual super-sensitive detection of colorless paracetamol. Method: the cobalt-modified polyheptazine imide is used to detect paracetamol in the following modes: mode one, rhodamine B-cobalt-modified polyheptazine imide is uniformly mixed with a paracetamol solution to obtain a to-be-detected suspension; the suspension is stirred and adsorbed in a Porphyrin multi-channel photocatalytic reactor under the condition of no light, a filter membrane is used for filtration after 532nm visible light is turned on, and ultraviolet-visible spectrophotometry is used for detection; mode two, the to-be-detected suspension is injected into a liquid-core optical fiber probe and is packaged, then a 532nm single-wavelength light source is turned on, and light irradiation is performed for 3-5min. The application can obtain the preparation method of cobalt-modified polyheptazine imide and application thereof in rhodamine B photosensitization detection of paracetamol.

This invention relates to a beneficiation method for lepidolite, comprising: classifying lepidolite-bearing minerals to obtain coarse-grained ore and fine-grained ore; subjecting the fine-grained ore to desliming and flotation sequentially to obtain a first lepidolite concentrate; separating the coarse-grained ore using a spiral sluice to obtain a second lepidolite concentrate; and combining the first and second lepidolite concentrates to obtain a final lepidolite concentrate. The collector used in the flotation comprises, by weight, 15-30 parts of sodium oleate sulfate, 5-10 parts of coconut oil amine, 7-15 parts of carboxylic acid, 4-8 parts of C1-C3 alcohol, and 2-6 parts of methyl isobutyl methanol. The beneficiation method provided by this invention, through a combined gravity-flotation beneficiation process, uses gravity separation to recover coarse-grained lepidolite and flotation to recover fine-grained lepidolite, solving the beneficiation problem of simultaneously recovering coarse-grained and fine-grained lepidolite, and efficiently recovering lepidolite minerals.

The invention belongs to the technical field of cobalt hydrometallurgy, and particularly relates to a method for preparing high-purity cobalt from crude cobalt hydroxide, which comprises the following steps of: performing size mixing on the crude cobalt hydroxide, and performing selective reduction leaching through concentrated sulfuric acid and sulfur dioxide to obtain cobalt leachate and manganese slag; sodium bicarbonate is adopted to adjust the pH of the cobalt leaching solution for segmented precipitation and filtration, and after impurities are removed, a nickel-containing cobalt sulfate solution is obtained; the solution is introduced into nickel removal resin subjected to qualified cobalt sulfate pre-saturation treatment for adsorption and elution separation, cobalt-containing effluent is combined, and high-purity cobalt sulfate is obtained; and finally, carrying out electrodeposition by taking the cobalt plate as an electrolyte solution to obtain the high-purity cobalt plate. According to the method, the processes of selective reduction leaching, sodium bicarbonate segmented precipitation, cobalt pre-saturation, resin adsorption nickel removal and cobalt electrodeposition are adopted, the method has the advantages of being short in technological process, easy to operate and low in cost, the prepared cobalt plate product is high in purity, and nickel sulfate is recycled.

The invention discloses a method for preparing nitrogen-doped biochar based on one-step co-pyrolysis of thermosetting resin and biomass. The method comprises the following steps: uniformly mixing urea resin solid powder, biomass and an activating agent; placing the mixed material in inert atmosphere protection, and carrying out temperature programming to 500-800 DEG C to carry out co-pyrolysis reaction; after the pyrolysis is completed, cooling, washing and drying to obtain the carbon material. According to the invention, one-step co-pyrolysis of urea-formaldehyde resin and biomass is utilized, effective doping of nitrogen element is realized at a relatively low temperature, in-situ molding of the material is realized by utilizing the thermosetting characteristic of urea-formaldehyde resin, and a molded carbon material with good mechanical strength can be obtained without an additional binder; the alkalescent potassium salt is selected as the activating agent and is environment-friendly, the prepared carbon material has high specific surface area and ultrahigh microporosity, the CO2 adsorption capacity is remarkably improved, the process is simple, and the energy consumption is low.

This invention discloses the preparation and application of a porous bismuth ferrite material. The preparation method includes the following steps: dissolving bismuth and iron salts in an acid solution to obtain a metal solution; adding a complexing agent and a pore-forming agent to the metal solution and mixing to obtain a precursor solution; heating the precursor solution to obtain a wet gel; drying the wet gel to obtain a dry gel; and calcining the dry gel under an inert atmosphere containing 6-10% oxygen to obtain the porous bismuth ferrite material. The porous bismuth ferrite electrode material of this invention not only solves the structural defects of traditional porous bismuth ferrite materials, such as small pore volume and insufficient utilization of active sites, but also fully utilizes its membrane capacitance characteristics and bimetallic synergistic effect, showing excellent application prospects in the field of capacitive deionization and chlorine removal.

The invention belongs to the technical field of gas separation, and particularly relates to application of a metal organic framework material with an open Bi < 3 + > site in N2O separation. The molecular formula of the metal organic framework material is Bi9 (C9H3O6) 9 (H2O) 9, and the metal organic framework material is generated by taking bismuth nitrate pentahydrate as a metal source and trimesic acid as an organic ligand through reaction in a solvothermal environment. The metal organic framework material has an open Bi < 3 + > site, can generate high-specificity interaction with N2O molecules, and can still realize high-selectivity adsorption of N2O under the coexistence condition of a plurality of competitive gases such as N2, O2, CO2 and the like.

The invention discloses a high-purity Ca-MOF fluorine fixing agent and a preparation method and application thereof.The preparation method comprises the steps that water is added into ardealite for size mixing, the pH value is adjusted, then filtering is conducted, a calcium ion solution is obtained, then an organic ligand and a solvent are added into the calcium ion solution, and MOF-1 is obtained through a reaction; and then mixing the MOF-1 with an activating agent, and activating to obtain the high-purity Ca-MOF fluorine fixing agent. Calcium ions are taken as a metal center to react with an organic ligand, and a crystal material with a three-dimensional porous structure is formed through in-situ polymerization self-assembly, so that a space is provided for precipitation reaction of the calcium ions and fluorine, and efficient capture and stable curing of the fluorine ions are realized.

The application discloses a method for reducing flocculants in gold smelting liquid, and belongs to the technical field of water treatment and ore dressing and smelting. In the first step, the pH of the gold smelting liquid is adjusted to 5.5-8.5; in the second step, modified activated carbon is added into the gold smelting liquid at a dosage of 0.4-0.6 g / L, the temperature of the gold smelting liquid is adjusted to 35-45 DEG C, and adsorption is carried out for 4-6 h under stirring. The application solves the problem of flocculant enrichment in ore dressing and smelting water, realizes efficient removal of flocculants in ore dressing and smelting water, has good economic efficiency and environmental protection, and meets the actual application requirements of industry. The application provides a new technical scheme for removing flocculants in ore dressing and smelting water, is suitable for water treatment processes in gold ore dressing and smelting industries, and has a wide industrial application prospect.

The invention relates to an application of allicin in food preservation, belongs to the technical field of food preservation, and discloses a pH response type microcapsule for applying allicin to food preservation, and the microcapsule has a core-shell structure; wherein the inner core comprises allicin; the shell layer is a pH-sensitive polymer shell layer and is configured to be stable when the pH value is lower than 6.0, and the shell layer starts to dissolve and release allicin of the inner core when the pH value is higher than 6.0; a key and measurable chemical signal-surface pH value increase in the decay process of perishable food is used as a triggering condition, limited preservatives are intensively used for inhibiting the most serious decay period, the preservation efficiency is maximized, the situation that excessive allicin covers and interferes with the food flavor in the initial preservation period is avoided, the allicin is only released when necessary, and the food flavor is not influenced. And the sensory acceptance is better.

This invention discloses a flotation method for porphyry copper-molybdenum ore, belonging to the field of mineral processing technology. The method involves crushing, grinding, pulping, and mixing the raw porphyry copper-molybdenum ore with the ore for flotation to obtain a mixed copper-molybdenum concentrate. This concentrate is then placed in a magnetic polishing machine equipped with an ultrasonic field for combined magnetic polishing and ultrasonic scrubbing, desorbing flotation reagents from its surface. Activated carbon is then added to the concentrate to adsorb the flotation reagents, resulting in a de-refined copper-molybdenum concentrate. This de-refined concentrate is then subjected to copper-molybdenum separation flotation to obtain molybdenum and copper concentrates. This method, combining magnetic polishing and ultrasonication, achieves efficient removal of reagents from the mineral surface. The use of activated carbon for timely adsorption of the removed reagents reduces the difficulty of subsequent copper-molybdenum separation, decreases the amount of inhibitor used, improves the efficiency of flotation reagents, and enhances the copper-molybdenum separation effect.

The present application relates to the field of purification, disclose a kind of adsorbent gradation method and purification method of hydrocarbon raw material for hydrocarbon raw material purification.The method includes renewable adsorbent and non-renewable adsorbent arranged in turn along the direction of flow, non-renewable adsorbent includes molecular sieve, binder, Salen ligand and transition metal element, based on the total amount of non-renewable adsorbent, the content of molecular sieve is 30-80wt%, the content of binder is 5-60wt%, the content of Salen ligand is 1-8wt%, the content of transition metal element is 1-8wt%, wherein, the Salen ligand has the structure as described in the following formula (1);R1 And R2 Each is independently selected from H, halogen, amino or C1-C5 Alkyl.The gradation method provided by the application can remove mercaptan and sulfide impurities in raw material simultaneously by using two kinds of adsorbents in combination,

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 relates to a nickel metal embedded porous carbon adsorbent, its preparation method, and its application, comprising the following steps: S1, adding a nickel salt solution dropwise to nano-silica, drying it, and then adding biomass for grinding; S2, pre-carbonizing the product after grinding in step S1 at a low temperature; S3, carbonizing the product after pre-carbonization in step S2 at a high temperature under inert gas protection; S4, adding an alkaline solution to the product after high-temperature carbonization in step S3 to remove the nano-silica, thereby obtaining the nickel metal embedded porous carbon adsorbent. Compared with the prior art, this invention has a unique embedded structure, which improves the stability of the metal sites, and has a large specific surface area and pore volume, thereby improving the selective adsorption capacity for Xe and effectively separating Kr and Xe.

This invention provides a composite hydrogel material, its preparation method and application, and a system and method for hydrogen adsorption-storage-release, relating to the field of hydrogen separation and recovery technology. The composite hydrogel material provided by this invention achieves selective adsorption of hydrogen through MOF-808 (Zr) nanoparticles with a pore size of 0.29~0.3 nm. Hydrogen is selectively adsorbed, while methane is blocked by the kinetic quantum sieving effect. After adsorption saturation, the hydrophobic groups of the thermosensitive polymer trigger the hydrophobic shrinkage of the composite hydrogel material, forming a closed hydrogen storage unit, thus achieving hydrogen storage. The local surface plasmon resonance peak of the gold nanorods dispersed in the thermosensitive copolymer is 798~818 nm. Under near-infrared light irradiation of the corresponding wavelength, the thermosensitive copolymer dissolves, initiating a phase transition in the composite gel core, achieving controlled hydrogen release. The silicon carbide layer serves as an outer shell, providing strong resistance to hydrogen sulfide corrosion.

The utility model provides a kind of hydrogen purification device with adsorption function belongs to hydrogen purification device field, including adsorption tower, adsorption subassembly and flushing subassembly;The bottom of adsorption tower is equipped with inlet pipe, and the top of adsorption tower is equipped with outlet pipe;The utility model: multiple adsorbent beds are equipped in the inside of adsorption tower, and adsorbent bed is sequentially from bottom to top: bottom layer: place active alumina, can effectively adsorb moisture and part macromolecular hydrocarbon impurity in raw material gas, middle layer: fill molecular sieve, raw material gas after active alumina preliminary processing enters molecular sieve layer, these small molecule impurities will be adsorbed by molecular sieve, further improve the purity of hydrogen, upper layer: adopt activated carbon, activated carbon can adsorb trace hydrocarbon, organic matter and other impurities remaining in raw material gas, carry out last refining to hydrogen, ensure that product hydrogen reaches high-purity requirement, improve the adsorption effect to impurity by being equipped with multiple adsorbent layers.

The invention belongs to the technical field of membrane catalysis and separation, and particularly relates to a Cu (I)-MOF mixed matrix membrane, a preparation method, a photocatalysis-separation integrated device using the Cu (I)-MOF mixed matrix membrane and application of the Cu (I)-MOF mixed matrix membrane. The preparation method comprises the following steps: mixing Cu (I)-MOF and a PEGBEM-POEM copolymer solution according to a specific mass ratio to prepare a membrane casting solution, scraping the membrane, and drying to obtain the mixed matrix membrane. Wherein the Cu (I)-MOF is synthesized from Hdmtz, Hdetz and copper oxide nano particles. The integrated device comprises a reactor shell provided with a plurality of layers of parallel partition plate assemblies, the mixed matrix membrane is fixed in the partition plate assemblies, the internal space is divided into reaction-separation units which are connected in series, and a light source is arranged. After wet CO2 is introduced into the device, a photocatalytic reduction reaction is carried out on the surface of the membrane under illumination to generate CO, and in-situ separation and multi-stage purification of CO and O2 are realized by utilizing the high selectivity of the membrane to CO. According to the invention, high-efficiency conversion and separation from CO2 to high-purity CO are realized.

This invention discloses a covalent organic framework composite membrane, its preparation method, and its applications, belonging to the fields of materials chemistry and analytical chemistry. The covalent organic framework composite membrane comprises a porous polymer substrate membrane, a polydopamine-mediated layer, and a covalently bonded functional layer. The functional layer is formed by linking 2,5-dihydroxy-1,4-phenylenedialdehyde and 5',5''-bis(4-aminophenyl)-[1,1':3',1'':3'',1'''-tetraphenyl]-4,4'''-diamine via imine bonds. This invention achieves controllable and robust growth of a novel COF on the surface of an inert polymer membrane through a "polydopamine-mediated layer + aldehyde pre-anchoring" strategy. As a solid-phase extraction medium, the composite membrane exhibits excellent enrichment performance and good reusability for trace amounts of carbamate pesticides in food and environmental samples, and has significant application value in sample pretreatment.