384 results about "Divalent metal" patented technology

The invention relates to the technical field of beneficiation of copper cobalt oxide ores, and discloses a flotation method for high-calcium-magnesium copper cobalt oxide ores and a combined collecting agent. The positive and negative mixed flotation technology is adopted, a combined collecting agent composed of oxidized paraffin soap, sodium oleate and divalent metal cations is adopted in the reverse flotation process, the total recovery rate of copper and cobalt reaches 90% or above, and the leaching acid consumption is 20-60 kg / t.feeding ore. The combined collecting agent adopted by the method is small in dosage, good in collecting performance and small in toxicity, compared with an existing copper oxide cobalt ore flotation technology, the method can improve the copper and cobalt recovery rate by 10% or above, leaching acid consumption is remarkably reduced, the production cost is remarkably reduced, the technological process is simple, and industrial application and popularization are easy.

The invention provides a polyanionic precursor, a sodium-ion battery positive electrode material, a preparation method of the sodium-ion battery positive electrode material, a sodium-ion battery and electric equipment, and relates to the field of sodium-ion batteries. The polyanionic precursor contains a substance of which the chemical general formula is NaqMm + nM'wPxOy.zH2O. The preparation method of the polyanionic precursor comprises the following steps: mixing a metal salt containing M < 2 + > and a first phosphorus source containing pyrophosphate to obtain a mixed solution, and reacting to obtain a mixed solution of pyrophosphate containing divalent metal M; and adding an oxidizing agent and a second phosphorus source for reaction, carrying out solid-liquid separation, and drying the separated solid to obtain the polyanionic precursor. The polyanionic precursor is high in tap density, and the prepared sodium ion battery positive electrode material is high in purity and excellent in electrochemical performance. The polyanionic precursor provided by the invention contains a small amount of insoluble Na, so that a sodium source can be saved when a positive electrode material is prepared.

The invention provides silk fibroin hydrogel containing divalent bioactive metal ions and a preparation method of the silk fibroin hydrogel, and belongs to the technical field of soft and hard tissue repair and medical dressings. The invention provides a silk fibroin hydrogel preparation method, which comprises: S1, dissolving degummed silk by using a dissolving agent to prepare a silk fibroin stock solution; s2, dialyzing the silk fibroin stock solution in water dissolved with divalent metal salt to obtain a silk fibroin composite solution; s3, carrying out heat preservation treatment on the silk fibroin composite solution, then applying shearing force, and incubating to obtain the silk fibroin hydrogel containing the metal ions. The preparation method of the silk fibroin hydrogel is simple, the pH value does not need to be adjusted in the preparation process, a gelatinizing agent does not need to be added, two cross-linking mechanisms of beta-folding cross-linking of a silk fibroin hydrophobic chain segment are promoted under the action of shearing force by chelating and cross-linking a silk fibroin hydrophilic chain segment through divalent metal ions, so that a silk fibroin aqueous solution is rapidly gelatinized, and the silk fibroin hydrogel is prepared. And meanwhile, one or more divalent metal ions can be compounded according to expected purposes, and good operability, biological safety and multifunctionality are achieved.

The invention provides a purification technology for regenerated DMT in a chemical recovery process of waste polyester, which comprises the following steps: S1) mixing divalent metal salt, trivalent metal salt, an alkaline reagent and water, and carrying out vacuum drying on the reaction product to obtain a layered double-metal hydroxide precursor; s2) mixing the precursor with a solution containing functional anions, and carrying out vacuum drying on a product obtained after intercalation modification to obtain functional anion modified layered double hydroxide; s3) carrying out electrostatic self-assembly on the hydroxylated hexagonal boron nitride and the layered double-metal hydroxide, carrying out suction filtration on the obtained mixed solution on a carrier, and drying to obtain an adsorption film; s4, the waste polyester alcoholysis solution is adsorbed through the adsorption film.According to the pretreatment technology for purification of the waste polyester alcoholysis solution, the purified alcoholysis solution has higher purity, and meanwhile the difficulty of follow-up reduced pressure distillation purification of regenerated DMT is effectively reduced.

The invention belongs to the technical field of biological medicines, and particularly relates to sodium pyruvate sustained-release gel nanoparticles based on redox response as well as a preparation method and application of the sodium pyruvate sustained-release gel nanoparticles. The preparation method comprises the following steps: adding modified gellan gum containing sulfydryl and catechol groups, phenylboronic acid modified gellan gum and sodium pyruvate into water to obtain a mixed solution; under the protection of inert gas, divalent metal salt and potassium persulfate are added into the mixed solution, stirring is performed for 3-5 h, after the reaction is finished, centrifugation is performed, precipitates are collected, washed and dried, and the composite material is obtained. Experimental results show that the sodium pyruvate sustained-release gel nanoparticles prepared by the invention can realize controlled release of drugs, reduce toxic and side effects caused by burst release of the drugs, improve the curative effect of the drugs and improve the bioavailability.

The invention discloses three-dimensional reticular porous MOFs / MXene cellulose composite aerogel as well as a preparation method and application thereof, and belongs to the technical field of aerogel. The preparation method comprises the following steps: adding divalent metal salt into an MXene aqueous dispersion to obtain a mixed dispersion I; sequentially adding the mixed dispersion liquid I and a borax aqueous solution into the mixed dispersion liquid of cellulose nanofibers and polyvinyl alcohol under a heating condition, stirring and dispersing, cooling, and freeze-drying to obtain double-crosslinked network aerogel; the preparation method comprises the following steps: preparing a bi-crosslinked network aerogel, immersing the bi-crosslinked network aerogel into a solution containing imidazole ligands for an in-situ reaction, and then washing and drying to obtain the three-dimensional network porous MOFs / MXene cellulose composite aerogel which has high MOFs loading capacity and excellent stability, can realize efficient adsorption of antibiotics, and is simple in preparation method and suitable for large-scale production.

The invention relates to the field of biological medicine, in particular to a water-soluble alginate microcarrier as well as a preparation method and application thereof. The alginate microcarrier comprises a carrier core structure and a shell surface modifier, the micro-carrier core layer is formed by carrying out plasma crosslinking on water-soluble alginate, ethylenediamine tetraacetic acid salt, nitrilotriacetic acid salt, diethylene triamine pentaacetic acid and water-soluble divalent metal salt, and light-sensitive alginate and a photoinitiator can also be added, so that the micro-carrier core layer has two crosslinking networks; the shell layer is composed of one of gelatin, collagen, fibrinogen, albumin and fibrin, or the gelatin, the collagen, the fibrinogen, the albumin and the fibrin and other biocompatible polymers; the obtained microcarrier has the characteristics of high transparency and rapid degradation, and adherent cells can be amplified in vitro; the microcarrier obtained in the invention can be used for mesenchymal stem cell culture, and can be rapidly degraded under a mild cell condition to harvest cells.

The invention relates to the technical field of biological tissue adhesives, in particular to a biological tissue adhesive composition. The biological tissue adhesive composition comprises a powder A, a powder B and a powder C, wherein the powder A is obtained by curing calcium silicate and acidic calcium phosphate in a curing liquid, curing, drying and crushing; powder B: bivalent metal salt; powder C: phosphorylated amino acid; and an aqueous solvent; the biological tissue adhesive is used for bone adhesion and bone repair. According to the biological tissue adhesive composition provided by the invention, a silicate / hydroxyapatite composite material with a bone induction function is synthesized through optimized bone cement reaction, a curing liquid is added to react with phosphorylated amino acid, and a bone adhesive material is obtained through organic and inorganic material coordination reaction; the bone repairing and regenerating capability and the bone bonding capability are good.

The present invention provides a silica / hydrotalcite composite slow-release fertilizer and a preparation method thereof, comprising the following steps: uniformly mixing amorphous silica, a divalent metal salt, a trivalent metal salt, and water to obtain a mixed solution; subjecting the mixed solution to a hydrothermal reaction, followed by filtering, washing, and drying to obtain a silica / hydrotalcite nanocomposite material; calcining the silica / hydrotalcite nanocomposite material to obtain a silica / metal oxide nanocomposite material; and loading inorganic and organic fertilizers onto the silica / metal oxide nanocomposite material to obtain a silica / hydrotalcite composite slow-release fertilizer. This preparation method is simple, highly feasible, low-cost, and easily scalable for industrial production. The layered and pore-channel structure of the silica / hydrotalcite nanocomposite material effectively provides ample space for the loading of nutrients, thereby improving the slow-release efficiency of nutrients in the fertilizer, increasing nutrient utilization efficiency, reducing fertilization frequency, and minimizing potential environmental impacts.

The invention discloses a gamma-polyglutamic acid and hydrophilic polysiloxane composite material and application thereof, and belongs to the technical field of medical antibacterial coating materials. The gamma-polyglutamic acid and hydrophilic polysiloxane composite material is prepared from a hydrophilic polysiloxane aqueous solution and a gamma-polyglutamic acid aqueous solution through an ionic cross-linking reaction, the hydrophilic polysiloxane is prepared by sequentially carrying out click chemical reaction and ionization modification on polysiloxane with a side chain containing vinyl and a sulfydryl-containing compound; the sulfydryl-containing compound also contains a carboxylic acid group or an amino-terminated group; when the sulfydryl-containing compound further contains carboxylic acid groups, the raw materials of the ionic cross-linking reaction further comprise an aqueous solution containing divalent metal cations. The composite material has low swelling rate and good antibacterial performance, and can be used for long-acting stable antibacterial. As an antibacterial coating, the composite material is suitable for the surfaces of medical apparatuses and instruments made of different materials, and has a wide application prospect.

The invention discloses a reagent for detecting the activity of isocitrate dehydrogenase. The reagent consists of a first reagent and a second reagent, the first reagent comprises an electron carrier, isocitric acid or isocitrate, divalent metal ions, a first reagent buffer solution, a first reagent additive, a first reagent preservative and a first reagent surfactant; the divalent metal ions comprise metal ions; the second reagent comprises a dye which comprises tetrazolium salt and has an oxidation state and a reduction state, a cofactor, a second reagent buffer solution, a second reagent additive, a coenzyme stabilizer, a second reagent surfactant and a second reagent preservative; the pH is buffered to 7-9.5 and 5-9 by the first buffer solution and the second buffer solution respectively; the first reagent additive and the second reagent additive comprise divalent metal salt, sugar, sugar alcohol, protein, chelating agent and basic amino acid; the first and second reagent surfactants comprise nonionic and anionic surfactants; the first reagent preservative and the second reagent preservative comprise sodium azide or isothiazolinones. The invention further discloses a corresponding detection method.

A method of forming a lanthanide or transition metal doped metal halide perovskite material whereby the method includes combining a monovalent metal cation-halide compound, a divalent metal cation-halide compound, and a lanthanide or transition metal halide compound in a solvent; evaporating the solvent to form a powder; and annealing the powder to form the lanthanide or transition metal doped metal halide perovskite material. The resultant materials or devices may be applied to various industrial applications or implemented as a scintillator and applied to various industrial applications.

The invention relates to the technical field of inorganic / organic composite film functional materials, and discloses a hydrotalcite material as well as a preparation method and application thereof. Carrying out a colloid mill nucleation reaction on the first mixed salt solution and an alkali solution to obtain hydrotalcite seed crystal slurry; mixing the second mixed salt solution, a slow-release precipitator, an anionic high-molecular polymer and a high-polarity polymer to obtain a mixed solution; dropwise adding the obtained mixed solution into hydrotalcite seed crystal slurry, and reacting to obtain a hydrotalcite material; wherein the first mixed salt solution and the second mixed salt solution both contain soluble divalent metal salt and soluble trivalent metal salt, and the types and the concentrations of the metal salts are the same. The hydrotalcite material provided by the invention has a larger plane size, and can effectively prolong the diffusion path of gas in a film and improve the gas barrier property when being added into a polymer matrix (such as polyurethane) as a functional aid.

The invention discloses application of colla corii asini bone-strengthening oral liquid to prevention and / or treatment of anemia, and belongs to the technical field of medicines, and the anemia comprises iron-deficiency anemia, renal anemia and myelosuppression anemia. The colla corii asini bone strengthening oral liquid can increase erythrocyte count, hemoglobin concentration, hematocrit, erythrocyte average hemoglobin amount, erythrocyte average hemoglobin concentration and / or erythrocyte average volume; the serum iron content is increased; a transporter divalent metal transporter and a membrane iron transporter are increased; the intestinal iron absorption is promoted. The composition specifically comprises urea nitrogen and creatinine; related indexes of renal anemia are improved; the immune index of renal anemia can be improved. The percentage of leukocytes and lymphocytes of anemia caused by myelosuppression can be recovered; the hemoglobin content is increased; the number of macrophage colony stimulating factors and / or bone marrow cells in serum is increased; the immunocompetence is improved; the proliferation of lymphoid B cells and macrophages is promoted.

The present invention relates to electrolyte repair and discloses a method for repairing an unbalanced battery electrolyte. The method comprises: mixing the anolyte and catholyte of an unbalanced battery to obtain a mixed electrolyte I; preparing a pentavalent ion electrolyte of metal cations in the mixed electrolyte I; mixing the pentavalent ion electrolyte with the mixed electrolyte I to obtain electrolyte II; obtaining RGB information of electrolyte II, wherein the amount of pentavalent ion electrolyte is such that the blue channel value in the RGB information of electrolyte II is maximized, to obtain electrolyte III; dividing electrolyte III into two portions, with one portion serving as the catholyte and an acid solution serving as the anolyte, and performing constant current electrolysis to obtain electrolyte IV; introducing an oxidizing gas into electrolyte III to oxidize the divalent metal cations to trivalent cations to obtain electrolyte V; and mixing the other portion with electrolyte V in equal volumes. This repair method has excellent repair effects and can improve the utilization efficiency of the unbalanced battery electrolyte.

The invention belongs to the field of resin preparation, and particularly relates to organic silicon modified phenolic resin as well as a preparation method and application thereof. The preparation method of the organic silicon modified phenolic resin comprises the following preparation steps: mixing a phenolic compound and an aldehyde compound, adding divalent metal salt into the mixture, uniformly stirring and mixing, adjusting the pH value of a reaction system, adding an organic silicon modifier, uniformly mixing, heating to react, adjusting the pH value of the system, washing and drying a product, thereby obtaining the organic silicon modified phenolic resin. The organic silicon modified phenolic resin is obtained. The prepared organic silicon modified phenolic resin is moderate in molecular weight, molecular weight distribution and specific viscosity and very good in spinnability; the fiber is prepared into a melt-blown non-woven material, and the melt-blown non-woven material is ultra-small in fiber diameter, high in porosity and small in pore diameter; and the melt-blown non-woven material also has the advantages of low thermal shrinkage rate, high residual carbon rate, excellent flame retardant property, thermal insulation property, good thermal protection property and long service life.

The invention discloses a method for preparing a denitrification composite carbon source by using kitchen waste, and relates to the technical field of kitchen waste resourceful treatment, and the method comprises the following specific steps: pretreatment, oil removal, hydrolytic acidification, solid-liquid separation, biochar preparation and carbon source compounding. Wherein the yield of volatile fatty acid (VFAs) can be remarkably improved by performing damp-heat pretreatment on fermentation, the biochar provides an adsorption carrier and a microorganism attachment site for the VFAs, the release period of a carbon source is prolonged, and a carbon source-carrier-catalyst ternary system is formed by the biochar, the VFAs and divalent metal cations, so that the denitrification rate is improved. The cost of the denitrification composite carbon source is obviously lower than that of a traditional commercial carbon source, and deep resource utilization of the kitchen waste is achieved.

The invention discloses a core-shell nano-enzyme composite spray gel dressing and a preparation method and application thereof.The dressing comprises a component A prepared from sodium alginate, N-isopropylacrylamide PNIPAM, core-shell nano-enzyme and curcumin and a component B of a divalent metal salt solution, and the component A and the component B are sprayed at the same time to form the core-shell nano-enzyme composite spray gel dressing. The preparation method of the core-shell nano enzyme comprises the following steps: mixing potassium ferrocyanide, ferric trichloride and polyvinylpyrrolidone to obtain a Prussian blue nano particle precursor solution; carrying out ultrasonic emulsification treatment and replacement on the curcumin core solution and the Prussian blue nanoparticle precursor solution; and freeze-drying to obtain the core-shell nano-enzyme. Through rapid ionic crosslinking of sodium alginate and divalent metal ions and the temperature-sensitive phase change characteristic of the temperature-sensitive polymer poly (N-isopropylacrylamide), the gel dressing is rapidly formed, the damaged skin is effectively covered and protected, the excellent antioxidant, anti-inflammatory and antibacterial capabilities are achieved, and the healing cycle of the radiodermatitis wound can be remarkably shortened.

The invention belongs to the technical field of battery materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified high-nickel ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and performing first calcination to obtain a first calcined product; (2) dissolving tellurate in an organic solvent, mixing and grinding the formed tellurate organic solvent solution and the first burning product obtained in the step (1), and then carrying out second burning to obtain a second burning product; the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the secondary calcined product obtained in the step (2) with water, mixing with boric acid, and carrying out third calcination to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps, the obtained modified high-nickel ternary positive electrode material has good specific capacity, first effect and cycle performance.

The present invention belongs to the technical field of biomedicine, and particularly relates to the use of a divalent metal lactate in the preparation of a product for preventing, improving, repairing and treating nerve damage. Preferably, the divalent metal lactate comprises one of or a combination of more than one of calcium lactate, magnesium lactate, zinc lactate and ferrous lactate. Provided in the present invention is a new treatment method for repairing central and peripheral nerve damage. The new treatment method has wide application prospects in the treatment and repair of central nerve damage caused by factors such as trauma, or peripheral neuritis or peripheral neurosensory abnormalities caused by factors such as viruses, diabetes and chemotherapeutic drugs.

The use of a divalent metal lactate in products for promoting tissue regeneration, growth, healing and damage repair, belonging to the technical field of biological medicines. Preferably, the divalent metal lactate comprises one or a combination of calcium lactate, magnesium lactate, zinc lactate and ferrous lactate. Provided is a new manner of treatment for tissue damage and repair, and prevention and treatment of tissue fibrosis and / or scar tissue generation, said manner of treatment having wide prospects of application in terms of damage treatment and repair of tissue such as skin, connective tissue, tendons and fascia.

The invention belongs to the technical field of biological medicines, and particularly relates to application of divalent metal lactate in a product for promoting tissue regeneration, growth, healing and damage repair. Preferably, the divalent metal lactate comprises one or a combination of more of calcium lactate, magnesium lactate, zinc lactate and ferrous lactate. The invention provides a new treatment mode for tissue injury and repair, and prevention and treatment of tissue fibrosis and / or scar tissue generation, and has wide application prospects in the aspects of injury treatment and repair of tissues such as skin, connective tissues, tendons, fascia and the like.

The invention provides a Bi-doped SnO catalyst and a preparation method and application thereof, a gas diffusion electrode and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: mixing divalent metal tin salt, a regulator and bismuth salt in water to obtain a mixed solution; and mixing the mixed solution with a sodium hydroxide solution, and reacting to obtain the Bi-doped SnO catalyst. The preparation method is simple, rapid, low in cost, green and free of organic solvent or high-temperature treatment, and the prepared catalyst is stable in structure and lasting in performance. The Faraday efficiency of a gas diffusion electrode prepared by adopting the Bi-doped SnO catalyst for synthesizing formic acid through electrocatalytic reduction of CO2 at-850 mA / cm < 2 > is as high as 98%, the gas diffusion electrode can stably run for more than 140 h under N2 purging in a solid electrolytic tank, and the concentration of formic acid continuously produced exceeds 5 mol / L.

The invention discloses a preparation method of a carboxyl-metal ion complexing anti-pollution nanofiltration membrane, and belongs to the scientific and technical field of water treatment. The method mainly comprises the following steps: taking a nanofiltration membrane as a base membrane, soaking the nanofiltration membrane in a polyphenol compound solution, and forming a layer of polyphenol compound on the surface of the nanofiltration membrane; soaking the nano-filtration membrane in an organic solution containing an organic compound, and stirring to obtain the nano-filtration membrane with carboxyl groups on the surface; and soaking the nano-filtration membrane in a water-soluble divalent metal salt solution with a certain concentration to obtain the anti-pollution nano-filtration membrane. The method is simple and easy to implement, mild in reaction and low in cost, the surface of the nanofiltration membrane is modified, divalent metal ions are arranged on the surface of the nanofiltration membrane, the anti-pollution function is achieved through the electrostatic repulsion effect, and the method has wide application value in the field of water treatment.

The invention relates to the field of piezoelectric ceramic materials, in particular to BNT-based leadless piezoelectric ceramic and a preparation method thereof.The BNT-based leadless piezoelectric ceramic has the chemical structural general formula as follows: (1-y-z) Bi1 / 2Na1 / 2Ti1-x (M1 / 3V2 / 3) xO3-yNdAlO3-zLiTaO3, M is a divalent metal element, x is larger than 0 and smaller than or equal to 0.015, y is larger than or equal to 0.01 and smaller than or equal to 0.05, z is larger than or equal to 0.01 and smaller than or equal to 0.05, and it can be known through tests that the BNT-based leadless piezoelectric ceramic prepared through the method has excellent piezoelectric performance and can be applied to the field of piezoelectric ceramics. The method has wide application prospects in the fields of pressure sensors, acceleration sensors, sonic sensors and the like.

The invention discloses a lithium-aluminum-silicon glass ceramic and a preparation method thereof. The lithium-aluminum-silicon glass ceramic is prepared from the following raw materials in percentage by mole: 58.0-70.0% of SiO2; the content of Al2O3 is 13.0%-16.4%; 8.3% to 16.5% of Li2O; 0.5% to 1.5% of Na2O; less than or equal to 10% of divalent metal oxide; 0.2% to 2.1% of ZrO2; 0.2% to 1.3% of TiO2; the divalent metal oxide is any one or any mixture of ZnO, MgO and CaO; according to the preparation method disclosed by the invention, the two processes of glass ceramic component design and sintering devitrification are cooperatively regulated and controlled, so that devitrification can be carried out at a relatively low temperature while bubbles are smoothly discharged, and the high-density and high-crystallinity lithium-aluminum-silicon glass ceramic is obtained; after the lithium-aluminum-silicon glass ceramic is sintered at 850 DEG C for 2-5 hours, the density can reach at least 80% of the maximum sintering density, the crystallinity reaches 85% or above, the thermal expansion coefficient is-0.5 to 3.5 * 10 <-6 > K <-1 >, the breaking strength is greater than 100 MPa, and the lithium-aluminum-silicon glass ceramic has excellent machinability.

A method for capturing carbon dioxide, by: (i) contacting carbon dioxide gas with an aqueous solution containing: (a) an aqueous solvent, (b) an amine-containing sorbent of the formula H2N—(CR2)n—NH2, wherein n is an integer of 3-12 and R is independently selected from H, CH3, CH2CH3, (CH2)mOH, and (CH2)pNH2 for each instance of R, wherein m and p are independently selected from 0-3; and (c) a monovalent or divalent metal salt of the formula MacXbd where M is a monovalent or divalent metal, X is an anion other than carbonate or bicarbonate, a is +1 or +2, b is −1 or −2, and a·c=b·d; wherein the contacting step results in precipitation of a complex carbamate salt of the formula H2N—(CR2)n—NHC(O)O−Ma and / or a complex dicarbamate salt of the formula Ma-O(O)CHN—(CR2)n—NHC(O)O−Ma; and (ii) separating the precipitated solid from the aqueous solvent, optionally followed by thermal regeneration of the amine-containing sorbent.

The invention discloses an inhibitor for relieving cement false setting as well as a preparation method and application thereof. The inhibitor comprises the following components in parts by weight: 5-10 parts of a retarding component, 0.5-3 parts of a surface active component and 87-94 parts of a metal impurity component, the retarding component is selected from one or more of sodium tripolyphosphate, sodium hexametaphosphate, hydroxyethylidene diphosphonic acid, amino trimethyl phosphonic acid, ethylenediamine tetra (methylene phosphonic acid), pentasodium diethylene triamine penta (methylene phosphonic acid) and 2-phosphonobutane-1, 2, 4-tricarboxylic acid; the metal impurity component is monovalent or divalent metal sulfate. The inhibitor can effectively relieve / solve the problems that the flowing property of fresh concrete becomes poor and the viscosity is sharply increased due to cement false setting, the working performance of the concrete is kept stable, and it is guaranteed that the concrete is easy to construct.

The present invention provides a grease composition and an axle bearing in which the grease composition is sealed.SOLUTION: The grease composition of the present invention contains a base oil, a thickener, and an additive, the additive contains an organic metal salt of a divalent metal and an inorganic metal salt of a divalent metal, the total mass of the metal content of the organic metal salt and the metal content of the inorganic metal salt is 1.00% by mass or more based on the grease composition, and the metal content of the organic metal salt with respect to the total mass of the metal content of the organic metal salt and the metal content of the inorganic metal salt is 0.20 or more on a mass basis.SELECTED DRAWING: None

The invention provides a preparation method of a boron adsorbent based on layered dihydroxide. The preparation method comprises the following steps: firstly, preparing layered dihydroxide LDHs from divalent metal salt M < 2 + > and trivalent metal salt M < 3 + >; then dispersing LDHs in a solvent to obtain slurry, adding a polyhydroxy organic matter into the slurry, and drying to obtain polyhydroxy organic matter intercalated hydrotalcite; the polyhydroxy organic matter is selected from meglumine, sodium gluconate, citric acid and / or tartaric acid, and finally calcining and grinding to obtain the boron adsorbent. According to the preparation method disclosed by the invention, the polyhydroxy organic matter is inserted, so that the obtained product has double effects of intercalation and surface functionalization, and active sites of reaction are increased while the interlayer spacing is increased, so that the adsorption capacity is greatly improved, and the adsorption capacity of the obtained product is remarkably higher than that of other adsorbents based on layered dihydroxide.