23results about How to "High adsorption selectivity" patented technology

The invention discloses a magnesium-doped calcium carbonate adsorbent and a preparation method and application thereof, the chemical formula of magnesium-doped calcium carbonate is as shown in the following formula (1): MgxCa1-x (CO3), x represents the molar ratio of magnesium to calcium, 0 lt; xlt; and 0.200%. Compared with pure calcium carbonate, the adsorption rate of the adsorbent based on the magnesium-doped calcium carbonate material provided by the invention is greatly improved, so that passivation of the pure calcium carbonate in the early stage of adsorption is relieved. Under the condition of the same phosphorus adsorption amount, the adsorption rate of the adsorbent is obviously improved. Alternatively, under the same adsorption time, the phosphorus adsorption amount of the adsorbent provided by the invention is obviously improved. The adsorbent provided by the invention has good adsorption selectivity (competitive ion interference resistance), so that the adsorbent has high practical application value. In addition, as the preparation is simple and convenient and the cost is low, the compound can be used as an agricultural fertilizer slow-release agent, can maintain the phosphorus content in farmland for a long time, and is more beneficial to the growth of crops.

The invention belongs to the field of recycling of precious metal resources in environmental engineering, and particularly relates to a preparation method and application of an organic polymer sphere adsorbent. The amidoxime modified self-polymerized microporous polymer (AO-PIM-1) is prepared into the spherical adsorbent through a phase inversion method, and compared with other traditional adsorbents, the polymer sphere adsorbent is high in specific surface area and good in thermal stability and water stability and has a large number of functional groups with high combining capacity for Au ions. In a low-concentration Au solution, a good adsorption effect and excellent adsorption selectivity are still kept, and Au ions in electronic waste leachate can be well adsorbed and recycled.

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.

This invention discloses a polyphosphazene / MXene self-supporting electrode loaded with cobalt single atoms, its preparation method, and its application, belonging to the field of seawater uranium extraction technology. Ti3AlC2 powder is etched in an HCl-LiF mixed solution and then ultrasonically exfoliated to obtain Ti3C2T. x Nanosheet suspension; simultaneously, hexachlorocyclotriphosphazene, 4,4'-dihydroxydiphenyl sulfone, and cobalt salt were dissolved in a solvent, and triethylamine was added. A condensation reaction was then carried out under ultrasonication to obtain Co-PZS; then Ti3C2T x After the nanosheet suspension is uniformly mixed with Co-PZS and carbon fiber fabric, it is transferred to a hydrothermal reactor for hydrothermal reaction. The resulting hydrothermal reaction product is then dried and calcined to obtain a polyphosphazene / MXene self-supporting electrode loaded with cobalt single atoms. This electrode is used for the electrochemical adsorption of uranyl ions in the solution system and exhibits excellent comprehensive uranium extraction performance, with advantages such as high capacity, fast rate, strong selectivity, and good stability, meeting the application requirements of seawater uranium extraction.

The invention provides synthesis of a fluorine-doped ion sieve precursor Li1. 6Mn1. 6O4 and application of the fluorine-doped ion sieve precursor Li1. 6Mn1. 6O4 to adsorption and lithium extraction, and belongs to the technical field of lithium extraction of adsorbent brine. The synthesis method comprises the following steps: putting an ion sieve precursor Li1. 6Mn1. 6O4 and a fluorine-containing ionic liquid into water, uniformly stirring, carrying out a thermal reaction, naturally cooling, carrying out suction filtration, washing, and finally carrying out vacuum drying to obtain the fluorine-doped ion sieve precursor Li1. 6Mn1. 6O4, the molar ratio of fluorine to manganese is (0.05-0.8): 1. The synthesis method of the fluorine-doped ion sieve precursor Li1. 6Mn1. 6O4 has the advantages that the raw materials are wide, the doping process is simple and controllable, the doped raw materials can be recycled, the energy consumption is lower, and the fluorine-doped ion sieve precursor Li1. 6Mn1. 6O4 is greener and more environment-friendly; the fluorine-doped ion sieve H1. 6Mn1. 6O4 prepared from the precursor is stable in performance, and has great significance in reducing manganese solution loss and improving a brine lithium extraction process.

This invention relates to the field of mineral processing flotation reagents, specifically disclosing a high-efficiency collector for the flotation of sphalerite and its preparation method. The high-efficiency collector provided by this invention achieves synergistic enhancement of the functions of each component by compounding isopropyl xanthate, dialkyl dithiocarbamate, and mercaptoacetate, and introducing a designed and synthesized polymeric synergist. The three basic collector components together constitute a dense and stable primary hydrophobic adsorption layer. The introduced synergist, on the one hand, enhances the adsorption strength and selectivity on the surface of sphalerite through multiple functional groups; on the other hand, its grafted hydrophilic polymer chains can form steric hindrance at the mineral-water interface and regulate local hydrophilicity and hydrophobicity, thereby further optimizing the hydrophobic state of the mineral surface and inhibiting gangue inclusions. The composite reagent provided by this invention improves the recovery rate of useful minerals while ensuring concentrate quality.

The invention relates to an integrated recovery process of aromatic hydrocarbons in hydrogen peroxide oxidation tail gas, which specifically comprises the following steps: preheating the oxidation tail gas to 95-115 DEG C, introducing the oxidation tail gas into an adiabatic expansion machine for adiabatic expansion, reducing the pressure to 0.1-0.15 MPa, suddenly reducing the temperature to 3-7 DEG C, realizing energy recovery and power generation by using the Joule-Thomson effect, and condensing and separating out most aromatic hydrocarbons; and the condensed tail gas enters the activated carbon adsorption tower for deep adsorption, so that the aromatic hydrocarbon content in the finally discharged tail gas is less than or equal to 70mg / m. Through cooperation of process units, efficient recovery of aromatic hydrocarbons (the total recovery rate is greater than or equal to 95%), self-sufficiency of energy and even negative energy consumption operation (the unit tail gas treatment energy consumption is-5-0 kW.h / 1000 m) are realized, the stability and economical efficiency of an adsorption system are remarkably improved, and the technical problems of high energy consumption, low recovery rate and poor adsorption stability of a traditional cooling and adsorption process are solved.

The present application relates to oil and gas field development and environmental protection technical field, especially an aging oil demulsification treatment method, comprising: mixing fly ash and sodium hydroxide, then calcining, acid leaching, then mixing with oily sludge and ferroferric oxide, reduction reaction, mixing the reduction reaction product with 3-mercaptopropyl triethoxysilane, modification reaction, to obtain magnetic adsorbent; mixing aging oil, partial phosphate and water, stirring, standing and separating, to obtain pretreated aging oil; adding magnetic adsorbent, complexing agent, wetting reverse agent and demulsifier to the pretreated aging oil, stirring, then microwave irradiation treatment, magnetic separation, vortex separation and centrifugal dewatering, to obtain purified oil. The present application removes FeS particles by magnetic adsorbent, combines with multi-assistant component synergistic demulsification and multi-field coupling physical separation, destroys the stable emulsification system of aging oil, and the process is efficient, suitable for industrial demulsification treatment of high stability aging oil.

The invention discloses a zinc-based modified molecular sieve adsorbent for removing tetrafluoroethylene in carbonyl fluoride and application of the zinc-based modified molecular sieve adsorbent in an adsorber, and belongs to the technical field of adsorption materials for electronic-grade gas purification. The preparation method comprises the following steps: (1) soaking a 5A molecular sieve in an ammonium citrate aqueous solution, treating at 60-90 DEG C for 4-8 hours, and drying to obtain a pretreated molecular sieve; (2) putting the pretreated molecular sieve into a zinc source aqueous solution, reacting at 70-90 DEG C for 12-24 hours, and drying after the reaction is finished; (3) roasting the dried product in an air atmosphere for 6-10 hours; and (4) circularly carrying out the steps (1)-(3) for 1-5 times to obtain a finished product. The prepared zinc-based modified molecular sieve has the advantages of high adsorption selectivity, long penetration time, excellent regeneration performance and the like, and is suitable for a refining process of electronic-grade carbonyl fluoride (the purity is greater than or equal to 99.99%) in semiconductor manufacturing.

The invention relates to a lignin carbon modified hydrogen evolution reaction catalyst which is prepared by the following steps: 1) dissolving lignin in deionized water to obtain a solution B; 2) respectively dissolving nickel salt, manganese salt and molybdenum salt in the solution B to obtain a mixed solution C, adding the mixed solution C and the pretreated nickel-based carrier into a reaction kettle for hydrothermal reaction, cooling to room temperature after the reaction is finished, taking out reaction liquid in the reaction kettle, filtering, cleaning a filter cake, and drying to obtain a primary sample; and 3) performing high-temperature calcination on the preliminary sample prepared in the step 2) in a mixed atmosphere environment of hydrogen and argon to obtain the lignin carbon modified hydrogen evolution reaction catalyst. Lignin serves as a carbon source, nickel salt, manganese salt and molybdenum salt serve as metal sources at the same time, the lignin and metal ions are subjected to chelation through hydrothermal reaction synthesis, high-temperature calcination reduction is conducted, and the lignin carbon modified hydrogen evolution reaction catalyst is obtained. The prepared catalyst is simple in method, low in cost and high in activity.

The application discloses a preparation method of high-purity sodium nitrate in the technical field of inorganic chemical industry, and comprises the following steps: dissolving crude sodium nitrate in deionized water and heating and stirring to obtain a crude solution; pre-saturating and activating a multi-dimensional cerium tungsten titanium heteropoly acid salt grafted mesoporous silica-aluminum skeleton material in saturated sodium nitrate aqueous solution; adding the activated material into the crude solution to perform stirring reaction, and filtering to obtain a sodium nitrate mother liquor; performing vacuum concentration, natural cooling crystallization, centrifugal separation and drying on the mother liquor, so that high-purity sodium nitrate is obtained. The method can efficiently remove impurities in sodium nitrate, and the product has high purity.

The fluorine content of the fluorine-doped ion sieve precursor is 0.2%-2%, and the particle size of the fluorine-doped ion sieve precursor is 80-150 nm. The invention also discloses a preparation method of the fluorine-doped ion sieve precursor. The preparation method comprises the following steps: preparing a manganese and lithium metal salt solution A, and preparing a citric acid solution B and a fluorine-containing salt solution D; mixing the solution A and the solution B, heating and stirring to obtain a colloidal solution C; performing vacuum drying on the solution C to obtain a solid intermediate; grinding the solid intermediate, and calcining in a muffle furnace to obtain an ion sieve precursor marked as LMO powder; weighing LMO powder, putting the LMO powder into a reaction kettle, and adding the fluorine-containing salt solution D and deionized water; placing the reaction kettle in a muffle furnace for heat treatment to obtain precursor slurry; and carrying out suction filtration, washing and drying on the precursor slurry to obtain the fluorine-doped ion sieve precursor. According to the invention, the ion sieve precursor is doped with fluorine, so that the electron transmission path of disproportionation reaction is changed, and the problem of manganese solution loss of LiMn2O4 in the process of adsorbing and extracting lithium is solved.

The utility model is applicable to the technical field of air purifiers, and discloses a circulating type toxic gas purifier which is applicable to purification of one or more gases such as radioactive gases, acid gases, alkaline gases, hydrogen sulfide, mercury vapor and the like. The modified activated carbon or the modified nano carbon fiber is used as an adsorption purification material of the purification module, so that the new purification module has higher adsorption capacity and adsorption selectivity, the purification efficiency of the purification machine can be improved, and the purification module can stably play a purification role when the purification machine is used for a long time in a high-humidity environment. The pulse discharge mechanism is arranged above the first air outlet of the air inlet fan, and the pulse discharge mechanism can be periodically started, so that air entering the machine shell can be ionized before entering the purification module, and when the ionized air enters the purification module, the air can be purified by the pulse discharge mechanism. The germs adsorbed on the modified activated carbon and the modified nano carbon fiber can be killed.

The invention relates to a COF adsorbent rich in N and S sites and a preparation method and application thereof, and belongs to the technical field of composite adsorption materials. According to the invention, 1, 3, 5-tri (3-hydrazino) triazine and 2, 2 '-bithiophene-5, 5'-dicarboxaldehyde are used as raw materials, and the COF adsorbent MEBD with a hydrazone bond connection structure is synthesized through a condensation polymerization reaction, and the structural formula is shown in the specification. The COF adsorbent MEBD rich in N and S sites can be used for efficiently and selectively adsorbing gold ions from a solution, and the adsorbent has excellent adsorption capacity and high cyclic regeneration capacity.

This invention provides a selective adsorption and efficient recovery process for fluorides in electrolytic aluminum flue gas based on high-efficiency activated carbon, relating to the field of electrolytic aluminum flue gas treatment technology. The process includes the following steps: Pretreatment-metal oxide loading-activation three-step process to prepare modified activated carbon with high selectivity for fluorides; filling the modified activated carbon into a multi-chamber fluidized bed adsorption tower, and using the waste heat from the electrolytic aluminum flue gas to heat the adsorption zone; This invention designs a three-step directional modification process of pretreatment-metal oxide loading-activation, using a mixed solution of dilute hydrochloric acid and hydrogen peroxide to remove impurities and expand pores in the activated carbon; loading Ce-Al binary metal oxides to endow the activated carbon with specific complexation adsorption capacity for fluorides; and then activation in a steam-nitrogen mixed atmosphere to optimize the pore structure, thereby improving the adsorption selectivity of the modified activated carbon for fluorides, extending the effective adsorption cycle of the adsorbent, and reducing the frequency of adsorbent replacement.

The invention discloses an efficient and stable decolorization process of a monosodium glutamate neutralization solution, and relates to the technical field of food processing. The process comprises the following steps: firstly, precisely adjusting a monosodium glutamate neutralization solution to 60-70 DEG C, then adding coconut shell activated carbon with a specific particle size according to 0.6-0.8% of the mass of the neutralization solution, stirring for 45-55 minutes at a constant temperature at 120-150r / min, and finally, realizing solid-liquid separation through precise filtration. Through the synergistic effect of closed-loop temperature control, precise feeding and optimized stirring, the high stability and high efficiency of the decolorizing process are ensured, the light transmittance of the neutralized liquid after decolorizing is stabilized at 86.5-87%, the chromaticity is smaller than or equal to 5, and the repeatability between batches is remarkably improved. In addition, the process can also comprise activated carbon regeneration and self-adaptive parameter adjustment functions based on online water quality analysis, the operation cost is greatly reduced while the decolorization effect is ensured, the adaptability to raw material fluctuation is enhanced, and the process is particularly suitable for industrial continuous production of high-quality monosodium glutamate.

The application relates to a preparation method of an amino-functionalized metal organic framework material and application of the prepared material to CO2 / N2 and CO2 / CH4 separation. The preparation method is as follows: adenine and copper nitrate trihydrate are dissolved in N, N'-dimethylacetamide to obtain a first mixed solution; a carboxylic acid and potassium carbonate are dissolved in deionized water to obtain a second mixed solution; the second mixed solution is added to the first mixed solution, and stirring reaction is carried out; and the obtained solid product is vacuum dried to obtain the amino-functionalized metal organic framework material. The amino-functionalized metal organic framework material prepared by the application has high CO2 adsorption selectivity and adsorption capacity, and has good acid resistance, alkali resistance and water resistance stability. The amino-functionalized metal organic framework material prepared by the application has excellent separation effect when applied to industrial CO2 adsorption separation.

The invention discloses a metal organic framework (MOF) with an efficient adsorption effect and a preparation method and application thereof, and belongs to the field of gas adsorption separation. According to the preparation method disclosed by the invention, solvent synthesis defects of the MOF material are utilized, a polar tube energy group is introduced to replace a defect group, and an adsorption dead zone is eliminated, so that the o-trifluoromethyl benzoic acid modified Ni-Mg-MOF-74 material capable of efficiently adsorbing is obtained. The MOF material prepared by the invention has excellent CO2 adsorption capacity and high CO2 / N2 selectivity.

This invention belongs to the field of environmental industrial water treatment technology, and discloses a modified lignin-attapulgite composite material, its preparation method, and its application. Method: Activated enzymatically hydrolyzed lignin is covalently grafted with a thiol reagent via a nucleophilic substitution reaction under inert gas protection, alkaline conditions, a catalyst, and a polar aprotic solvent system to obtain thiolized enzymatically hydrolyzed lignin. Attapulgite is mixed with an aqueous solution of an active metal component, ultrasonically dispersed, and then an alkaline solution is added dropwise, followed by calcination to obtain Me-ATP. Water, Me-ATP, thiolized enzymatically hydrolyzed lignin, and a penetrant are mixed and subjected to a hydrothermal reaction to obtain S / EHL-Me-ATP. This S / EHL-Me-ATP is dispersed in a spherical polymer molding solution, then added dropwise to water. After phase separation, spherical particles are obtained, and after standing, the composite material is obtained. This invention improves the adsorption selectivity, adsorption capacity, and regeneration performance of the composite material for pollutants. The composite material is less prone to agglomeration, its mechanical strength is significantly improved, and recycling is simpler.

The application discloses a kind of metal organic framework materials and preparation method and application thereof.The metal organic framework material provided by the application includes metal ions and organic ligand, and the organic ligand is selected from the compound shown in formula I or formula II.The metal organic framework material of the application has excellent adsorption separation selectivity to p-xylene.The raw material for synthesizing the material is cheap and easy to obtain, the material preparation process is simple and low in cost, and the material has good regeneration and repetition performance, and can maintain the original adsorption effect after vacuum or heating regeneration, and has wide industrial application prospect.

This invention discloses a selective hydrogenation catalyst, its preparation method, and its applications. The selective hydrogenation catalyst of this invention comprises a support, an active component, and an auxiliary agent. The active component includes tungsten oxide and rhenium heptaoxide, and the auxiliary agent includes iron and an organic complexing agent. This selective hydrogenation catalyst ensures the hydrogenation of C=C double bonds or olefins while preventing hydrogenation saturation of aromatic rings or aromatic hydrocarbons, and also possesses strong hydrodesulfurization performance.

The invention discloses a biochar purification process, and relates to the technical field of biochar preparation, biochar raw materials are screened, impurity particles with the particle size larger than 50 meshes are removed, and the moisture content of the screened raw materials is controlled to be smaller than or equal to 15%; putting the pretreated raw material into a nitric acid solution with the concentration of 0.1-0.5 mol / L, stirring and dipping at 50-70 DEG C for 1-3 hours, and then washing with deionized water until the raw material is neutral; alkali washing treatment: dipping the raw material subjected to acid washing and drying in a potassium hydroxide solution with the concentration of 0.2-0.6 mol / L, stirring and dipping at 40-60 DEG C for 2-4 hours, and washing with deionized water again until the raw material is neutral; pyrolyzing and purifying; physical screening; and chemical activation. Compared with the prior art, the invention has the advantages of optimized graded pore structure, high purity, low ash content, improved process stability, energy saving, consumption reduction and environmental protection.

The invention discloses a magnetic nano composite material for adsorbing precious metal ions as well as a preparation method and application thereof, and belongs to the technical field of precious metal recovery. The magnetic nano composite material disclosed by the invention is composed of Fe, FeS, a carbon layer and porous carbon, the Fe, the FeS, the carbon layer and the porous carbon have nanoscale sizes and structures; the magnetic nano composite material has the following structure: embedded nanospheres are uniformly distributed in a network structure formed by porous carbon; the nanosphere has a core-shell structure, the core is Fe, the shell is FeS, and the nanosphere is wrapped with a carbon layer. The magnetic nano composite material can highly selectively adsorb more than 99% of Au (III), Ag (I) and Pd (II) from more than 20 kinds of metal ions within 10 min, and precious metal separation can be rapidly achieved in a mode of externally applying a magnetic field.