30results about How to "Strong complexing ability" patented technology

The invention relates to the technical field of water treatment, and discloses a water treatment agent for oilfield reinjection water and a preparation method thereof. The water treatment agent for oilfield reinjection water is obtained by copolymerization of sulfonic imidazoline quaternary ammonium salt modified quinoline, Mannich base modified chitosan, acrylic acid and sodium hypophosphite. The water solubility and corrosion inhibition of imidazoline are improved through quaternization modification of imidazoline, quaternary ammonium salt imidazoline can be adsorbed on the metal surface, the corrosion rate is reduced, the quaternary ammonium salt imidazoline serves as a surface active agent, the infiltration and dispersion effects are achieved, and the descaling rate is increased; the sulfonic acid group improves the temperature resistance and prevents the generation of gel, and the strong hydrophilicity of the sulfonic acid group enables a molecular chain to fully stretch in water, so that the scale inhibition performance is improved; mannich base is introduced into chitosan, the acid solubility and temperature resistance of chitosan are improved, the coordination chelation effect of chitosan is enhanced through the conjugation effect of aromatic rings, and the corrosion inhibition effect is improved; various functional groups play a synergistic effect, so that the corrosion and scale inhibition effect is further enhanced.

The invention relates to a copper-based catalyst for hydrogen production through methanol cracking and a preparation method of the copper-based catalyst, and belongs to the technical field of hydrogen production through methanol cracking, and the preparation method of the copper-based catalyst for hydrogen production through methanol cracking comprises the four steps of nano zirconium phosphate modification, preparation of nano zirconium phosphate-copper manganese zinc oxide, preparation of copper aluminum zirconium gel and aftertreatment. The copper oxide content of the obtained copper-based catalyst for hydrogen production through methanol cracking is 7.5-14.3 wt%, the initial performance is that the methanol conversion rate is 97.1-98.2%, the hydrogen selectivity is 98.2-98.9%, the CO content in reformed tail gas is 0.11-0.17%, and the heat-resistant performance is that the methanol conversion rate is 96.5-97.7%, the hydrogen selectivity is 97.6-98.3%, and the CO content in the reformed tail gas is 0.15-0.19%.

The invention discloses an amino acid water-soluble fertilizer and a production process thereof. The amino acid water-soluble fertilizer comprises the following components in parts by weight: 12-30 parts of nitrogen, 5-18 parts of phosphorus, 5-15 parts of potassium, 0.1-6 parts of sulfur, 20-24 parts of potassium fulvate, 6-8 parts of humic acid, 8-10 parts of amino acid, 0.1-0.5 part of a nitrification inhibitor, 0.01-0.2 part of trace elements and 200-300 parts of water. The amino acid and fulvic acid are doubly chelated with medium trace elements, the humic acid is used as a masking agent to produce the medium trace element chelate, the prepared amino acid water-soluble fertilizer is high in element utilization rate and can be degraded in the natural environment, meanwhile, the mixing efficiency of raw materials in the production process is high, and the production cost is low. Raw material agglomeration and non-uniform stirring caused by directly adding the potassium fulvate, the humic acid and the amino acid into the tank body are avoided.

The present invention discloses a nonionic polyether type polymer surfactant and a preparation method and application thereof. The nonionic polyether type polymer surfactant is obtained by esterification modification or etherification modification of the secondary hydroxyl group of the chain polyether type polymer surfactant and is used as a soaping agent for cotton fabrics. The nonionic polyether type polymer surfactant prepared by the present invention has strong adsorption performance, complexing ability and colloid protection performance, etc., can have a strong binding ability with dyes during soaping, has a strong removal effect on floating color on the surface of fabrics, makes the washed dyes stably exist in the washing liquid, no longer stains the fabrics, and effectively avoids the occurrence of flocculation and precipitation.

The application relates to the field of new energy material preparation technology, and particularly discloses a method for synthesizing manganese iron phosphate from phosphating slag and application of the manganese iron phosphate in a positive electrode material. The method for synthesizing manganese iron phosphate from phosphating slag comprises the following steps: S1. Taking phosphating slag to detect the manganese and iron contents, dissolving the phosphating slag in concentrated phosphoric acid to obtain clear filtrate A; S2. According to the manganese and iron contents measured in S1, a divalent manganese salt and a ferrous salt are weighed and added into the filtrate A to obtain filtrate B; S3. A soluble zinc salt and a complexing agent are added into dilute phosphoric acid to configure a bottom solution; S4. The filtrate B is slowly added into the bottom solution to obtain manganese iron phosphate precipitate; and S5. Manganese iron phosphate powder is obtained. The manganese iron phosphate powder synthesized from the phosphating slag is used as raw material, mixed with lithium carbonate and glucose, pure water is added, sand grinding is carried out, spray drying is carried out, and sintering is carried out under the protection of a nitrogen atmosphere to obtain a manganese iron lithium phosphate positive electrode material, and the problems of low resource utilization efficiency of the phosphating slag and poor synthesis effect of the manganese iron phosphate are solved.

The invention belongs to the technical field of steel plate tin plating, and particularly discloses an antioxidant for methanesulfonic acid tin plating and a preparation method thereof, and the antioxidant comprises the following components by weight: 1-10 parts of 8-hydroxyquinoline sulfonate, 1-10 parts of citrate, 5-10 parts of methanesulfonic acid, 0.1-1 part of benzenediol, and the balance of deionized water. The preparation method comprises the following steps: (1) dissolving 8-hydroxyquinoline sulfonate in deionized water to prepare a solution A; (2) weighing a proper amount of methanesulfonic acid and citrate, and adding the methanesulfonic acid and citrate into the solution A to prepare a solution B; (3) weighing a small amount of benzenediol, and adding the benzenediol into the solution B to prepare a solution C; and (4) heating the solution C to 55-65 DEG C, and continuously stirring to obtain the antioxidant after the substances are completely dissolved. The antioxidant effectively inhibits oxidation of divalent tin ions in the methanesulfonic acid tin plating solution, and reduces oxidation of tin, so that generation of tin oxide and tin sludge is inhibited.

The invention discloses a lithium ion battery, which comprises a positive plate, a diaphragm, a negative plate and an electrolyte, the electrolyte comprises an additive, and the additive comprises an additive A with a structure as shown in a formula I and an additive B with a structure as shown in a formula II; and the positive plate and / or the negative plate are / is provided with hole channels along the thickness direction. Compared with the prior art, the additive A and the additive B can improve the high and low temperature performance, the cycle performance and the hot box performance, but the additive A and the additive B are high in viscosity and poor in wettability, so that the problem of poor wettability of the additive A and the additive B can be solved by matching with the pore channels formed in the pole piece, and the wettability of the electrolyte is effectively improved; a lithium ion transmission path is shortened, so that the electrochemical performance of the battery is improved.

The invention relates to the technical field of oilfield exploitation, and provides a rare earth complex trace element tracer agent for oilfield development. The method comprises the following steps: firstly, preparing a complexing agent aqueous solution, and dissolving a selected complexing agent in a proper amount of water to obtain the complexing agent aqueous solution; preparing a rare earth salt aqueous solution, reacting the rare earth element powder with dilute acid to generate rare earth salt precipitate, extracting the rare earth salt precipitate, performing evaporative crystallization, drying and crushing to obtain rare earth salt powder, and dissolving the rare earth salt powder in a proper amount of water to obtain the rare earth salt aqueous solution; and then adding the rare earth salt aqueous solution into the complexing agent aqueous solution, placing the mixed solution in a water bath at the constant temperature of 90 DEG C, uniformly stirring, continuously carrying out complexing reaction for 3 hours, crystallizing, crushing and drying to obtain the rare earth complex trace element tracer agent.

The application relates to a preparation method of a sodium ion battery positive plate, and belongs to the technical field of new energy batteries. The specific scheme comprises the following steps: step one, uniformly dispersing Prussian blue positive materials and organic solvents to obtain slurry A; the organic solvents comprise a combination of one or more of N-methyl pyrrolidone, polyvinyl pyrrolidone and nitriles; step two, adding a binder into the slurry A and uniformly stirring to obtain slurry B; step three, adding a conductive agent into the slurry B and uniformly stirring to obtain slurry C; removing bubbles from the slurry C and adjusting the viscosity to obtain slurry D; step four, coating the slurry D on a positive current collector, baking, rolling, cutting and obtaining the sodium ion battery positive plate. The application can prevent subsequent glue liquid from entering Prussian blue cavities, can effectively guarantee the adhesive glue amount attached to the surface of active materials, can prevent positive electrode cold pressing and formation demolding, and can solve the problem of the battery cell manufacturing process.

The present invention discloses a polyester fiber production process without antimony metal catalysis, and relates to the technical field of organosilicon materials. The present invention discloses a polyester fiber production process without antimony metal catalysis, comprising the following steps: using terephthalic acid and ethylene glycol as raw materials for esterification reaction, continuously adding a titanium catalyst during the esterification reaction to obtain an esterification product; inputting the esterification product into a pre-polycondensation kettle for pre-polycondensation reaction to obtain an oligomer; inputting the oligomer into a polycondensation kettle for polycondensation reaction to obtain a polycondensate; after the polycondensate is spun and post-finished, a polyester fiber is obtained; the present application uses a self-made titanium catalyst to replace the traditional antimony catalyst, which not only accelerates the reaction process, but also leaves no antimony metal residue in the product. The titanium catalyst prepared in the present application gets rid of the defects of the traditional titanium catalyst that is easily hydrolyzed to form TiO2, causing the polyester product to turn yellow, and has low thermal stability.

The invention belongs to the technical field of polyurethane synthesis, and particularly relates to a catalyst for synthesizing hard polyurethane and a preparation method of the catalyst. According to the catalyst, bismuth iso-octoate is taken as a matrix, hydroxypropyl methyl cellulose is firstly adsorbed on the surface of bismuth iso-octoate, and then 2-aminoterephthalic acid and bismuth iso-octoate are complexed at a certain temperature, so that the bismuth iso-octoate can better exert catalytic activity and selectivity, and the generation of byproducts is inhibited; furthermore, a polyurethane product has excellent mechanical properties, and the catalyst is more suitable for preparing a hard polyurethane material.

The invention discloses a highly safe lithium ion battery positive electrode sheet and a lithium ion battery comprising the positive electrode sheet, wherein the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer attached to the positive and negative surfaces of the positive electrode current collector, the surface of the positive electrode current collector is coated with an inorganic polysilazane-polydopamine-graphene composite coating, and the positive electrode active material layer is coated on the surface of the inorganic polysilazane-polydopamine-graphene composite coating. The highly safe lithium ion battery positive electrode sheet of the invention has the characteristics of effectively avoiding copper precipitation, avoiding heat accumulation, excellent rate performance and good cycle life.

The invention discloses a method for recovering metal lithium in a waste lithium battery positive electrode material, which comprises the following steps: dissolving a lithium ion battery positive electrode material to be recovered in a nitric acid solution to prepare a stock solution to be recovered; the stock solution to be recovered is sampled into a filler chromatographic column, filler is polyacrylonitrile fiber modified by amination of diethylenetriamine, and effluent within six column volumes is collected; and replacing the filler chromatographic column and continuously repeating the process until all the to-be-recycled samples are treated, thereby completing the recycling of the metal lithium in the waste lithium battery material. According to the method, the recovery rate of Li is increased to the greatest extent.

The invention provides a method for preparing nano calcium carbonate through amine cycle by capturing carbon dioxide through ferronickel slag, and belongs to the technical field of waste resource utilization and carbon dioxide capture and utilization. The method comprises the following steps: mixing ferronickel slag powder with an ammonium chloride solution, and performing leaching reaction to obtain a mixed solution; adding ammonium hydroxide into the mixed solution to adjust the pH value, and filtering to obtain a leaching solution; introducing the flue gas into an ammonia water absorption tower to prepare an ammonium bicarbonate solution; the ammonium bicarbonate solution and the leachate are subjected to a carbonization reaction, nano calcium carbonate is obtained, ammonia gas generated by the carbonization reaction is recycled to an absorption tower to be reused, and a closed amine circulation system is formed. According to the amine circulation method, efficient utilization of CaO in the ferronickel slag can be achieved, meanwhile, CO2 in the flue gas is captured, the purity of obtained nano calcium carbonate is larger than or equal to 93%, the whiteness is larger than or equal to 94%, the nano calcium carbonate has the advantages of being small in particle size, good in dispersity and high in additional value, and cooperative utilization of high-additional-value recycling of the ferronickel slag and carbon dioxide emission reduction is achieved.

The present invention belongs to the field of chemistry and environmental technology, and relates to an electric field-assisted cyanated MOFs and graphene aerogel composite uranium adsorption material and a preparation method thereof. The present invention uses the prepared electric field-assisted uranium adsorption composite material as a raw material to prepare a uranium adsorption electrode. Metal ions cross-link with oxygen in carboxyl groups to form porous MOFs materials, which can increase porosity and increase active sites, thereby improving its adsorption performance. By combining porous MOFs materials with graphene aerogels, the aggregation of MOFs materials is effectively weakened, the utilization of adsorption sites is improved, and the adsorption performance of uranium is greatly improved. The adsorption material prepared by the present invention has abundant cyano groups, has adsorption selectivity for hexavalent uranium, and can also preferentially select uranium for adsorption when other ions coexist.

The application relates to the technical field of supramolecules, in particular to a pillar[n]arene derivative-DCOIT slow-release supramolecular self-assembly body, application and a preparation method. The supramolecular self-assembly body loads DCOIT by taking a pillar[n]arene derivative as a molecular carrier; the pillar[n]arene serving as the carrier can form a supramolecular assembly body with DCOIT through hydrogen bond interaction between pi and CH2, the host-guest complexation of the two is strong, and the pillar[n]arene derivative can effectively control the slow release of DCOIT; the supramolecular self-assembly body is good in safety and stability, low in cost, beneficial to industrialized production, and wide in application field; the method is simple in operation, low in preparation cost, easy to realize, and beneficial to industrial promotion.

The invention relates to the technical field of magnesium alloy surface treatment, in particular to a bright pickling additive for magnesium alloy containing heavy metal elements and a preparation method of the bright pickling additive. Comprising the following components: 5 g / L of potassium fluotitanate, 10 g / L of sodium metavanadate, 50-70 g / L of ammonium bifluoride, 30-50 g / L of sodium metasilicate nonahydrate, 100-200 mL / L of lactic acid and 50-70 mL / L of phytic acid, by adding the potassium fluotitanate, the potassium fluotitanate is reduced into TiO2 when making contact with a metal magnesium alloy matrix, so that the surface potential of a workpiece is balanced, the polishing effect is achieved, and by adding the ammonium bifluoride, the surface of the workpiece is not prone to being damaged. By adding sodium metasilicate nonahydrate, dirt formed on the surface of a magnesium alloy workpiece due to precipitates formed by metal ions such as Cu and Ag is reduced, and by adding sodium metasilicate nonahydrate, generation of heavy metal cation precipitates is reduced, so that dust on the working surface is reduced. The cleaning agent can be matched with low-concentration inorganic strong acid and organic acid to perform bright cleaning on magnesium alloy surfaces containing various heavy metals in different processing states under the environment operation from low temperature to medium temperature.

The invention discloses a sulfydryl-containing alkyl polysiloxane polymer which is characterized by comprising the following components in parts by weight: 5-15 parts of 3-mercaptopropyl trialkoxysiloxane, 5-15 parts of alkyl polysiloxane, 5-15 parts of alkyl polysiloxane, 5-15 parts of alkyl polysiloxane, 5-15 parts of alkyl polysiloxane, 5-15 parts of alkyl polysiloxane, 5-15 parts of alkyl polysiloxane, 5-15 parts of alkyl polysiloxane, 5-15 parts of alkyl polysiloxane, 20 to 40 parts of trialkoxy siloxane with C12 to 16 alkyl groups; 30 to 50 parts of alkyl trialkoxy siloxane with a carbon number of 1 to 3; and 0 to 5 parts of gamma-aminopropyl triethoxy silane. The invention also discloses a preparation method and application of the compound. A water-based metal surface protective agent formed by the sulfydryl-containing alkyl polysiloxane polymer prepared by the method under the action of an emulsifier can effectively protect copper metal on the surface of a flexible printed board, effectively improve the water resistance and salt spray resistance effects and provide long-term stability and protection effects.

The invention relates to the technical field of wastewater treatment, in particular to a quartz sand-based PMS catalyst and a preparation method thereof.The preparation method comprises the steps that pretreated quartz sand is put into an alkaline solution of dopamine hydrochloride, stirring reaction is conducted for 10-16 h at the room temperature, the quartz sand is separated, washing and drying are conducted with water and ethyl alcohol respectively, and quartz sand wrapped with a polydopamine layer is obtained; dissolving divalent manganese salt and cobalt salt in water to obtain a first solution, and dissolving 2-methylimidazole in water to obtain a second solution; and immersing the quartz sand wrapped by the polydopamine layer into a mixed solution of the first solution and the second solution, carrying out stirring reaction at room temperature, carrying out solid-liquid separation, washing a solid phase with water and ethanol respectively, and drying to obtain the quartz sand-based PMS catalyst. The catalyst disclosed by the invention has good separation, recovery and reutilization characteristics, and the catalytic efficiency is promoted by utilizing polydopamine, so that the degradation speed of PMS on organic matters in wastewater is greatly improved.

The present invention relates to an online anti-scaling and descaling agent for circulating water and a preparation method thereof, and belongs to the technical field of water treatment. The preparation method of the anti-scaling and descaling agent provided by the present invention is as follows: first, β-cyclodextrin-carbon quantum dots are prepared, and then some hydroxyls on the β-cyclodextrin are polymerized with acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid; then, epichlorohydrin is used as a bridge to graft diethylenetriamine onto the remaining hydroxyls of β-cyclodextrin, and then 2-chloromalonic acid is substituted with the amine group on the diethylenetriamine. The anti-scaling and descaling agent prepared by the present invention has good water solubility and high temperature resistance, and contains a large number of carboxyl groups, sulfonic acid groups, amine groups and hydroxyls, and can be complexed with scale-forming ions to form a soluble complex, and has a strong complexing ability. At the same time, β-cyclodextrin can capture Ca 2+ Mg 2+ It enters its cavity, causing the inorganic salt scale lattice to be distorted, further preventing the formation of inorganic salt scale, and has a good effect in preventing and removing inorganic salt scale.

The application provides an electrolyte, a lithium ion battery and a power device, the electrolyte comprising a solvent, a lithium salt and an additive; wherein the solvent comprises a fluoroether, a carbonate compound and a carboxylic acid ester compound, and the mass ratio of the fluoroether, the carbonate compound and the carboxylic acid ester compound is (10-20):(40-65):(20-45); and the additive comprises a first additive, and the first additive is a tetranitrile compound as shown in formula I. Compared with the prior art, the electrolyte of the application adds the fluoroether in the solvent, so that a SEI film with better toughness can be formed on the metal lithium negative electrode side, thereby improving the stability of the metal lithium negative electrode interface; meanwhile, the tetranitrile compound is also added as the additive, which can effectively improve the stability of the positive electrode, and cooperates with the fluoroether to effectively balance the transmission rate of lithium ions, effectively improves the lithium dendrite problem prone to occur in the metal lithium negative electrode system, and thereby improves the cycle life and safety performance of the battery.

The invention provides a rare earth metal-based medical rubber material for preventing harms caused by edge tools, a rare earth metal-based filling material is added into the medical rubber material, and the rare earth metal-based filling material is prepared from a rare earth nitrate compound, citric acid and a polymer ligand by a coprecipitation method in an alkaline environment. The mass ratio of the citric acid to the rare earth nitrate compound is 1: (10-15). According to the invention, the modified rare earth oxide with a lamellar structure is adopted as a rare earth metal-based filling material, so that the anti-puncture capability of the medical rubber material is improved. Compared with the traditional medical rubber material, the anti-puncture performance of the product is obviously improved by using the material.

The present invention provides a rare earth metal-based functional material and its application in the preparation of medical rubber materials. The rare earth metal-based functional material is prepared by coprecipitation of rare earth chloride and L-lactic acid in an alkaline environment, and the mass ratio of L-lactic acid to rare earth chloride is 1: (0.5-2). The rare earth metal-based functional material of the present invention is assembled into a sheet structure unit through charge action, and the rare earth metal-based functional material with a sheet structure is added to the rubber raw material, thereby improving the anti-puncture ability of the rubber material, and can also play an efficient antibacterial role, which not only protects medical staff but also effectively plays a positive role in the health of patients.

The invention relates to the technical field of metal passivators, and particularly discloses a preparation method of a nano metal passivator. A preparation method of a nano-metal passivator comprises the following steps: firstly, preparing a complexing dispersant with good stability and dispersibility, and then mixing the complexing dispersant with effective metal to prepare the nano-metal passivator. The nano metal deactivator prepared by the invention has the advantages of good dispersity and high effective component content, and can effectively improve the activity of a catalytic cracking catalyst.

The invention discloses a lithium ion battery electrolyte for a silicon-based negative electrode, a preparation method of the lithium ion battery electrolyte and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium ion battery electrolyte comprises the following components in percentage by mass: 6.25-25% of lithium salt, 0.01-4% of an additive A, 1-8% of an additive B and the balance of an organic solvent. The invention also provides a preparation method of the lithium ion battery electrolyte and a lithium ion battery comprising the electrolyte. The lithium ion battery electrolyte provided by the invention effectively inhibits volume expansion and electrolyte side reaction of a silicon-based negative electrode in a circulation process, and effectively solves the problems of high-rate circulation, high-temperature storage and the like of a commercial silicon-based negative electrode lithium ion battery.

The invention discloses a preparation method of an inferior residual oil hydrodemetallization catalyst, which comprises the following steps: mixing hydrated alumina, phenolic resin and an adhesive, adding an aqueous solution containing low-carbon alcohol, kneading, forming, drying and roasting to obtain an alumina carrier; dissolving a metal compound by using organic acid and hydrogen peroxide, and adding a composite complexing agent to prepare a metal impregnation liquid; wherein the active metal compound comprises metals of the VIII group and the VIB group; the specific surface area of the inferior residual oil hydrodemetallization catalyst is 80-180 m < 2 > / g, the pore volume is 0.5-1.1 cm < 3 > / g, and the proportion of the pore volume corresponding to pore channels with the pore diameter larger than 100 nm in the total pore volume is not less than 10%. According to the invention, phenolic resin is used as a pore-enlarging agent, and is partially dissolved under the action of low-carbon alcohol, and a macroporous diffusion channel with the size of more than 100nm is formed in the alumina carrier after extension crosslinking, so that the cost is low, thermoplasticity and thermoset are realized, the molding is easy, and the carrier strength is high.

The invention discloses a purification method of di (diethylamino) silane, which comprises the following steps: S1, adding industrial-grade di (diethylamino) silane into a first rectifying tower, carrying out light component removal treatment, and leading out a light component removed product from the bottom of the tower; s2, introducing the light component-removed product into a second rectifying tower, carrying out heavy component removal treatment, and leading out the heavy component-removed product from the tower top; and S3, introducing the de-heavy product into a condenser, condensing the de-heavy product into a liquid state, introducing the liquid state into an adsorption tank, carrying out adsorption treatment, and introducing the liquid state into a finished product tank through a filter screen after the treatment is completed, so as to obtain the high-purity di (diethylamino) silane. Wherein the adsorption tank in the step S3 is filled with a composite modified adsorbent. According to the method, metal ion impurities, tri (diethylamino) silane, mono (diethylamino) silane and phosphorus-containing impurities in di (diethylamino) silane can be removed by adding a specific adsorbent, so that the purity of the obtained di (diethylamino) silane reaches 99.99 wt% or above.

The invention provides a lithium-rich manganese-based material for a solid-state battery and a preparation method and application of the lithium-rich manganese-based material, and the preparation method comprises the following steps: carrying out coprecipitation reaction on a nickel-manganese mixed metal source solution, a first complexing agent solution, a second complexing agent solution, a third complexing agent solution and a precipitator solution to obtain precursor particles; the types of complexing agents in the first complexing agent solution, the second complexing agent solution and the third complexing agent solution are different, and the third complexing agent solution comprises a porphyrin complexing agent; and mixing and sintering a lithium source and the precursor particles to obtain the lithium-rich manganese-based material for the solid-state battery. According to the preparation method disclosed by the invention, the high-dispersity small-particle manganese-rich precursor can be prepared by adopting a method of matching multiple complexing agents, so that the high-dispersity small-particle lithium-rich manganese-based material can be prepared, the lithium-rich manganese-based material can be ensured to be in better contact with a solid electrolyte, and the performance of the solid-state battery is improved.

The present invention belongs to the technical field of flue gas desulfurization, discloses a dual-function desulfurization catalyst and its preparation method and application, and solves the technical problems of low cost and low desulfurization efficiency of dual-function desulfurization catalyst in the prior art. The dual-function desulfurization catalyst is used to remove COS and H2S in flue gas at low temperature. The preparation method of the dual-function desulfurization catalyst includes the following steps: impregnating activated carbon in a first modification solution, filtering, drying and heat-treating after the impregnation is completed; the first modification solution contains urea and at least one of soluble copper salt, iron salt and zinc salt; impregnating activated carbon in a second modification solution, filtering, drying and heat-treating after the impregnation is completed, and obtaining a dual-function desulfurization catalyst; the second modification solution contains alkali metal salt and / or alkali.

The invention provides a rare earth metal-based functional material and application thereof in preparation of a medical rubber material, the rare earth metal-based functional material is prepared from rare earth chloride and L-lactic acid in an alkaline environment by a coprecipitation method, and the mass ratio of the L-lactic acid to the rare earth chloride is 1: (0.5-2). The rare earth metal-based functional material disclosed by the invention is assembled into a lamellar structure unit through a charge effect, and the rare earth metal-based functional material with a lamellar structure is doped into a rubber raw material, so that the anti-puncture capability of the rubber material is improved, and an efficient antibacterial effect can be achieved; and a positive effect is effectively achieved on the health of the patient while the medical personnel are protected.