234 results about "Ferric salts" patented technology

The invention relates to a sunken porous magnetic alloy ball wave-absorbing material and a preparation method and application thereof.The wave-absorbing material is prepared through the following steps that S1, citric acid, soluble ferric salt, soluble cobalt salt and soluble nickel salt are dissolved in a mixed solvent of ethylene glycol and water, and the mixture is fully stirred to form a uniform mixed solution; and S2, the mixed solution obtained in the step S1 is subjected to spray drying, obtained precursor powder is placed in the air atmosphere to be calcined to remove the carbon source, then the precursor powder is placed in the H2 / Ar atmosphere to be subjected to heating reduction, and the porous FeCoNi alloy balls with the surface pits are obtained and are the target product. The surface of the prepared alloy microsphere has an obvious concave structure, magnetic anisotropy and magnetic performance are enhanced, a small number of pores are generated in the reduction process, impedance matching of the material is optimized, and effective high-frequency electromagnetic absorption is achieved; and due to the synergistic effect of the recesses and the pores, the obtained alloy microspheres have obvious lightweight characteristic, and have good application prospects in the field of electromagnetic absorption.

The invention belongs to the field of catalysts, and discloses a catalytic material based on lignin derivation and a preparation method and application thereof. The catalytic material is prepared from lignin derived carbon and NiFe LDH; the lignin derived carbon is inserted into the interlayer of the NiFe LDH and is coated on the surface of the NiFe LDH. The preparation method comprises the following steps: S1, dissolving a lignin derivative in water to obtain a first solution; s2, dissolving metal salt in water to obtain a second solution, wherein the metal salt comprises ferric salt and nickel salt; s3, mixing the first solution and the second solution, and adjusting the pH value to obtain a mixed solution; and S4, immersing the conductive current collector into the mixed solution for hydrothermal reaction, taking out the conductive current collector after the reaction is finished, and treating the conductive current collector to obtain the catalytic material. The obtained catalytic material is used for an anode oxygen evolution reaction in an electrolytic seawater environment, and has high activity, high stability and good chlorine corrosion resistance.

The invention discloses a system and method for directly preparing battery-grade ferrous oxalate based on dimethyl oxalate, and the system comprises a rectifying tower which is used for carrying out hydrolysis reaction on dimethyl oxalate and discharging a hydrolysis solution through a liquid phase outlet; the decolorizing kettle is used for decolorizing the hydrolysis solution; the precipitation reaction kettle is used for carrying out mixed reaction and aging on the hydrolysis solution and ferric salt; the product recovery unit is connected with the precipitation reaction kettle and is used for separating and recovering reaction products to obtain battery-grade ferrous oxalate. According to the method, the hydrolysis solution of the dimethyl oxalate and the iron salt are directly mixed for precipitation reaction to prepare the battery-grade ferrous oxalate, high-energy-consumption steps such as crystallization and drying in the oxalic acid solid production process are reduced, meanwhile, the step of dissolving the solid oxalic acid is not needed, the heating energy consumption needed in the dissolving process is reduced, and the production efficiency is improved. The production energy consumption is greatly reduced, the production equipment and process are reduced, the cost is reduced, and the product yield is favorably improved.

The invention provides a step-by-step leaching remediation method for chromium-contaminated soil, which comprises the following steps: mixing the chromium-contaminated soil and a first leacheate, carrying out first oscillation, then adding a second leacheate into the mixture, and carrying out second oscillation to obtain the remediated soil, the first leacheate comprises sodium salt; the second leacheate comprises organic acid and ferric salt; the temperature of the second oscillation is 70 DEG C to 90 DEG C. The method comprises the following steps: desorbing and releasing hexavalent chromium adsorbed on the surfaces of soil particles by using a sodium salt eluting agent, dissolving the soil particles to promote release of insoluble hexavalent chromium, and dissolving the soil particles containing high-concentration insoluble hexavalent chromium by using a composite eluting agent of organic acid and ferric salt under a high-temperature condition. And when the hexavalent chromium is released, the hexavalent chromium is efficiently reduced and stabilized, so that the aim of removing the hexavalent chromium in the polluted soil is fulfilled.

The invention discloses preparation and application of a nickel selenide / ferronickel phosphate crystal / amorphous heterogeneous catalyst, and relates to the technical field of electrochemistry. Selenizing the foamed nickel at low temperature in an inert atmosphere to generate a crystalline NiSex layer in situ; and by taking the obtained electrode as a working electrode, carrying out electrodeposition in a deposition solution containing nickel salt, ferric salt, hypophosphite and acetate by adopting a cyclic voltammetry method, so that amorphous NiFePOy is deposited on the surface of NiSex, and a NiSex / NiFePOy crystal / amorphous heterostructure nanosheet layer is constructed and is used for an alkaline medium urea oxidation reaction. The invention has the following beneficial effects: crystalline / amorphous interface coupling and a nanosheet self-supporting structure synergistically improve active sites and charge transfer capability, reduce energy consumption and improve current output; meanwhile, the electrode stability and durability are enhanced; the method has the advantages of low material cost, mild and simple process, suitableness for amplified preparation, and application potential of urea-assisted water electrolysis energy-saving hydrogen production.

The invention discloses a preparation method and application of a high-entropy layered double hydroxide oxygen evolution catalyst, and relates to the field of oxygen evolution reaction catalysis, and the preparation method comprises the following steps: S1, washing foamed nickel in absolute ethyl alcohol and deionized water, and then carrying out ultrasonic treatment in a hydrochloric acid solution to obtain pretreated foamed nickel; s2, adding ferric salt, cobalt salt, nickel salt, manganese salt, zinc salt and a proper amount of urea into deionized water, then adding ammonium fluoride, and uniformly stirring to obtain a mixed solution; and S3, transferring the mixed solution and the pretreated foamed nickel into a reaction kettle, carrying out a hydrothermal reaction, and washing and drying the obtained product to obtain the high-entropy layered double hydroxide oxygen evolution catalyst. According to the method, the key regulation and control effect of NH4F on the structure, chemical and electro-catalytic properties of HELDHs in the synthesis process of the HELDHs is analyzed, and the performance enhancement is attributed to NH4F-induced morphology and crystal engineering and catalytic active cation vacancies generated in situ through selective leaching of Zn < 2 + > and adsorption of sulfate under the alkaline condition.

The invention provides a method for removing phosphorus from a cobalt sulfate solution. The method comprises the following steps: providing a cobaltous sulfate solution to be treated; the method comprises the following steps: mixing a to-be-treated cobaltous sulfate solution, a composite polymer soluble ferric salt and a coagulant aid, carrying out precipitation reaction, and separating to obtain phosphorus-containing slag and cobaltous sulfate primary purified liquid; a deep phosphorus removal adsorbent is adopted to adsorb trace phosphorus in the cobalt sulfate primary purification liquid, then trace iron in the cobalt sulfate primary purification liquid generates precipitates in an oxygen-containing atmosphere, and after separation, a cobalt sulfate secondary purification liquid is obtained. According to the method, firstly, the synergistic effect of the composite polymer soluble ferric salt and the coagulant aid is adopted, and primary efficient removal of phosphorus is achieved; then, a deep phosphorus removal adsorbent is used for directionally adsorbing trace phosphorus in the cobalt sulfate primary purification liquid, so that deep removal of phosphorus is further realized; and finally, the residual trace iron is precipitated and separated in the oxygen-containing atmosphere, so that the purity of the secondary purified cobalt sulfate liquid is further guaranteed.

The invention provides an iron-based catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, continuously conveying pulverized coal into an absorption reactor, simultaneously continuously conveying an iron salt solution, an alkali liquor and compressed gas into a three-fluid mixing nozzle in the absorption reactor, spraying fog drops containing iron precipitates with the diameter of less than or equal to 1000 microns, and enabling the fog drops containing the iron precipitates to be loaded on the surface of the pulverized coal to obtain a precursor; wherein the three-fluid mixing nozzle comprises a feeding area, an atomization area and a precipitation reaction area from top to bottom, and the feeding area comprises a central channel, an inner annular gap channel and an outer annular gap channel from inside to outside; the ferric salt solution is conveyed to the atomization area through the central channel, and the alkali liquor is conveyed to the atomization area through the outer annular gap channel; or the alkali liquor is conveyed to the atomization area through the central channel, and the ferric salt solution is conveyed to the atomization area through the outer annular gap channel; compressed gas is conveyed to the atomization area through the inner annular gap channel; and S2, carrying out ball milling and drying treatment on the precursor to obtain the iron-based catalyst.

The invention discloses a method for preparing 2, 5-diformyl furan by selectively oxidizing 5-hydroxymethylfurfural, which comprises the following steps of: reacting 5-hydroxymethylfurfural serving as a raw material, air or oxygen serving as an oxidant, nitrate or ferric salt and sodium iodide serving as main active components of a catalyst and DMSO (dimethylsulfoxide) serving as a solvent at the temperature of between 80 and 160 DEG C for a certain time under the condition of normal pressure, and separating a product to obtain the 2, 5-diformyl furan. The ferric salt is ferric nitrate nonahydrate, and the catalyst is 2, 5-diformyl furan. The dosage of the ferric salt is 0 to 0.50 mmol; the use amount of the sodium iodide is 0 to 0.50 mmol. According to the method, DMSO is adopted as a solvent, the used catalyst is cheap and easy to obtain, the yield of 2, 5-diformyl furan can reach 95% at most after the reaction is carried out at 140 DEG C for 20 h, the requirement for equipment is low, and the method is suitable for industrial production.

The application discloses a method for removing organic pollutants by using molybdenum dioxide to promote activated periodate, and comprises the following steps: adding molybdenum dioxide, ferric salt and periodate into wastewater containing organic pollutants, and then performing catalytic degradation reaction to remove the organic pollutants in the wastewater. In the method, molybdenum dioxide is introduced into the homogeneous ferric / periodate system, and serves as an electron donor and mediator of a Fenton-like reaction. The molybdenum dioxide can not only accelerate the Fe 3+ / Fe 2+ cycle rate and promote the activation of the periodate, but also promote the generation of high-valence iron (Fe(IV)) in the system, form a non-radical pathway dominated oxidation mechanism, promote the degradation reaction to be more rapid and intense, and finally realize the efficient degradation of the organic pollutants. The method has the advantages of rapid degradation rate, good reusability, simple process, convenient operation and environmental friendliness, and can be widely used in the treatment of organic pollutant wastewater.

The application discloses a method for synthesizing tervalent tetraaryl iron porphyrin from pyrrole, aromatic aldehyde and ferrous salt, which comprises the following steps: adding anhydrous aluminum chloride, aromatic aldehyde, pyrrole and ferrous salt into DMF under stirring, and then heating and refluxing the reaction mixture for 0.5 hours under nitrogen; removing the nitrogen and continuing to heat the reaction mixture for a certain time; stopping the reaction; cooling the reaction mixture; and placing the reaction mixture at 273K overnight; and finally filtering the reaction mixture to obtain the iron porphyrin.

The invention discloses a defluorination agent suitable for defluorination of electronic industrial wastewater as well as a preparation method and a defluorination method of the defluorination agent. The defluorination agent comprises 9-10 wt% of aluminum salt, 0.1-0.2 wt% of ferric salt, 0.6-1.1 wt% of an alkaline regulator and the balance of water, the aluminum salt is selected from one or more of polyaluminum chloride and aluminum sulfate, and the ferric salt is selected from one or more of ferric trichloride, ferric sulfate and polyferric sulfate. The fluorine removal agent provided by the invention can realize that the fluorine concentration of discharged water is lower than 1mg / L through one-stage / two-stage fluorine removal under a low-fluorine, medium-fluorine or high-fluorine water inlet condition, the optimal pH condition of reaction is reduced, the acid-base and agent use cost is saved, and meanwhile, the fluorine removal agent is simple in preparation method and can be applied to large-scale popularization and production.

This invention provides a lithium iron phosphate cathode material, its preparation method, and its application. The preparation method includes the following steps: (1) mixing ferrous salt and phosphorus source with an alcohol solvent, heating and stirring, and adding a first lithium source solution to obtain a mixed solution; adjusting the pH of the mixed solution to obtain a mixed precursor; (2) mixing a complexing agent, ferric salt, a second lithium source, phosphorus source, and surfactant with water, stirring to form a sol solution; mixing the mixed precursor obtained in step (1) with the sol solution, heating and stirring to obtain a gel precursor; (3) sintering the gel precursor to obtain the lithium iron phosphate cathode material; wherein the mixed precursor includes lithium phosphate and ferrous phosphate. This invention can achieve lithium iron phosphate gradation of different particle sizes through a single production line, improving the uniformity and compaction density of the material, and avoiding performance differences and poor stability between different batches.

The invention relates to the technical field of preparation of lithium ion battery positive electrode materials, in particular to a method for regulating and controlling a high-exposure {010} crystal face of a manganese-rich phosphate-based positive electrode material, which comprises the following steps: weighing manganese salt (MnO2, MnC2O4. 2H2O, MnCO3, Mn (H2PO4) 2, MnC4H6O4. 4H2O and the like), ferric salt (FeSO4. 7H2O, Fe2O3, FePO4 and the like), lithium salt (LiOH, Li2CO3, CH3COOLi, LiH2PO4 and the like), phosphate (NH4H2PO4) and sulfate (MgSO4, NaSO4, FeSO4. 7H2O and the like) according to the molar ratio of (1-n): n: 1: 1: 0.01 (n = 0.4, 0.5, 0.6 and 0.7), adding 10-50% of organic drying at the temperature of 80-110 DEG C to obtain a precursor; putting the precursor into a tubular furnace, presintering for 2-5 hours at the temperature of 300 DEG C in an argon atmosphere, and then naturally annealing; and heating to 700 DEG C, sintering for 6-10 hours in an argon atmosphere, and naturally annealing to obtain the lithium manganese iron phosphate positive electrode material with the highly exposed {010} crystal face. After the highly-exposed {010} crystal face material LiMn0. 6Fe0. 4PO4 prepared by the method disclosed by the invention is circulated for 300 times at a high rate of 5C, the specific discharge capacity retention rate is as high as 95.7% and is far higher than 50.4% of that of an unmodified control sample.

The invention relates to a preparation method and application of an iron-cerium supported catalyst, and the preparation method comprises the following steps: S1, carrier pretreatment: washing, drying and calcining an alumina carrier to obtain a pretreated carrier; s2, preparing an impregnation liquid: uniformly mixing ferric salt, cerium salt and a core-shell material to obtain the impregnation liquid; s3, catalyst impregnation: putting the pretreated carrier into impregnation liquid for impregnation to obtain an impregnated catalyst; and S4, calcining: drying the impregnated catalyst, and calcining to obtain the iron-cerium supported catalyst. The catalyst prepared by the invention can improve the mineralization efficiency of organic matters in antibiotic wastewater, so that the effluent quality of the wastewater reaches the standard.

The invention discloses a rare earth doped iron oxyhydroxide / ferric oxide-three-dimensional graphene composite material and a preparation method thereof, the material is x% RE-FeOOH / Fe2O3 (at) 3D Gr, x is the molar ratio of rare earth ions to iron ions, the value range of x is 1-8.5, RE is one of rare earth elements Ce, La, Sm, Nd or Y, and RE is one of rare earth elements Fe, La, Sm, Nd or Y; the preparation method comprises the following steps: preparing a mixed solution A from an iron salt, a rare earth salt and an alkaline solution, adding a complexing agent into a graphene oxide solution to prepare a mixed solution B, performing ultrasonic treatment on the two solutions, mixing, adding a reducing agent, performing ultrasonic treatment again, and finally performing hydrothermal treatment, washing, freeze drying and low-temperature sintering. Rare earth ions can induce oxygen vacancies, increase active sites and promote ion transmission, the maximum mass specific capacitance of the material under 0.5 A / g reaches 1218.7 F / g, and the maximum capacitance retention rate of a flexible supercapacitor assembled by the material is 97% after 5000 times of charging and discharging.

The invention relates to an adsorption material and a preparation method and application thereof, and relates to the technical field of adsorption materials, the preparation method comprises the following steps: taking a charcoal raw material, ferrite and ferric salt as raw materials, heating and stirring under an alkaline condition, and then carrying out pyrolysis treatment to obtain a magnetic charcoal material; and performing swelling treatment on the magnetic biochar material by using a CO2 supercritical fluid carrying imidazolium ionic liquid containing a sulfonic acid group to obtain a first magnetic biochar material and the like. On the basis of the prior art, a magnetic biochar material is subjected to combined and cooperative treatment mainly by adopting a CO2 supercritical fluid carrying acidic ionic liquid swelling treatment process and a corona discharge treatment process in a hydrogen peroxide-containing atmosphere in sequence; the removal efficiency of the obtained adsorption material on suspended solids and organic pollutants under the room temperature condition and the recycling stability are remarkably improved, so that the requirement of multiple times of recycling under the scenes of high suspended solids and high grease content such as cosmetic wastewater treatment can be met.

The invention discloses a preparation method of petroleum coke-based artificial graphite with high tap density, and belongs to the technical field of new energy materials. The preparation method provided by the invention comprises the following steps: S1, petroleum coke and a solution are mixed and reacted to form a polymer in situ on the surface of the petroleum coke, the solution contains a monomer and organic metal salt, and the organic metal salt comprises at least one of ferric salt, cobalt salt and nickel salt; s2, graphitizing a product obtained in the step S1; the graphitization atmosphere contains a hydrocarbon carbon source and inert gas; and S3, pickling the product obtained in the step S2. According to the preparation method provided by the invention, the tap density, the energy and the cycle performance of the artificial graphite can be effectively improved, and meanwhile, the rate capability is maintained and even improved.

The application relates to the technical field of water treatment flocculants, and discloses an aluminum-iron sulfate salt flocculant and a preparation method thereof. The method is characterized in that firstly, the attapulgite is subjected to acid activation, silanization, starch etherification grafting and free radical copolymerization modification, so as to obtain a modified attapulgite functional carrier which has a nano adsorption skeleton, an organic long chain and strong positive electricity; then, the carrier is taken as a core to carry out a hydrolysis-supporting reaction with ferric sulfate, aluminum sulfate and carbide slag under pH control; finally, sodium silicate is introduced to construct an inorganic gel network, and the aluminum-iron sulfate salt flocculant is obtained through ripening and drying. Through construction of an organic-inorganic hybrid structure, the application realizes multiple synergies of electric neutralization, adsorption bridging and net capture and sweeping, the product has high removal capacity for colloidal particles and dissolved organic matters, the flocculation body is compact and can be rapidly settled, and the product has the comprehensive advantages of low raw material cost, stable process and environmental friendliness.

The application provides a process for recycling electrolytic copper to efficiently smelt and form copper balls, which comprises an electrolyte purification and arsenic removal process and an electrolytic copper smelting and forming copper ball process; the electrolyte purification and arsenic removal process comprises: evaporating and concentrating and cooling and crystallizing the arsenic-containing electrolyte to separate copper sulfate crystals and a crystallization mother liquor; introducing an oxidizing agent into the crystallization mother liquor to oxidize trivalent arsenic into pentavalent arsenic; adding an iron salt and a pH regulator into the oxidized solution to control the pH value to be 3.5-4.5, so that arsenic is precipitated in the form of ferric arsenate; solid-liquid separation is performed to obtain ferric arsenate slag and a post-arsenic-removal solution, and the ferric arsenate slag is discharged for disposal; the electrolytic copper smelting and forming copper ball process comprises: performing pickling, water washing and drying on cathode electrolytic copper obtained through electrolytic refining, and then pressing the cathode electrolytic copper into dense copper blocks; smelting the dense copper blocks under the protection of inert gas, performing degassing and deoxidizing refining after melting, pouring and forming the refined copper liquid, and sequentially performing air natural cooling and water mist cooling to room temperature after demolding.

The invention relates to an iron-based catalyst for directly preparing olefin from synthesis gas as well as a preparation method and application of the iron-based catalyst. The preparation method comprises the following steps: preparing a polymer solution and an iron salt solution, mixing to obtain a mixed solution a, mixing the mixed solution a and a nitrate solution b, and carrying out a co-precipitation reaction to obtain co-precipitation slurry; centrifuging, washing and drying the obtained coprecipitation slurry to obtain a catalyst precursor; and calcining the obtained catalyst precursor to obtain the iron-based catalyst, wherein the mass ratio of the polymer to the ferric salt in the mixed solution a is 1: (0.6-40). Compared with the prior art, the catalyst is prepared by innovatively adopting a method of introducing an auxiliary agent into a polymer in situ, and the synergistic effect between the auxiliary agent and the iron-based catalyst active component is remarkably enhanced, so that the CO2 and methane selectivity of the catalyst in a Fischer-Tropsch synthesis reaction is effectively reduced, and meanwhile, the selectivity of target olefin is also effectively improved.

This invention discloses a method for preparing and applying nanocluster magnetic beads, comprising the following steps: adding a salt solution containing ferrous and ferric salts to an aqueous solution, dissolving it uniformly, then adding a dispersant to obtain a mixed solution, stirring evenly, and heating; adding ammonia water to the heated mixed solution, stirring the reaction to obtain nanocluster magnetic beads. This invention directly synthesizes nanocluster magnetic beads using an innovative one-step method, eliminating the need for multi-step synthesis and subsequent separation steps, and the synthesized nanocluster magnetic beads can be used for cell separation and MRI imaging.

The present application relates to municipal engineering pipe network maintenance technical field, specifically to a kind of composite reagent for removing hydrogen sulfide in pipe network and its preparation method and application.The present application provides a kind of composite reagent for removing hydrogen sulfide in pipe network, by weight parts, including 90-95 parts of ferric salt, 3-7 parts of dispersing agent, 2-3 parts of 2-amino benzothiazole.Three components form "dispersion-adsorption-synergistic" integrated mechanism: dispersing agent guarantees that reagent is fully contacted with hydrogen sulfide, ferric salt provides precipitation reaction basis, synergist further strengthens adsorption and reaction kinetics, improves the removal rate of hydrogen sulfide with the advantages of low cost, no secondary pollution, realizes efficient, economic, environmental hydrogen sulfide management.

The application provides a preparation method of a sodium ferrous disulfide catalyst and application of the sodium ferrous disulfide catalyst in direct coal liquefaction, and relates to the technical field of coal liquefaction.The preparation method of the sodium ferrous disulfide catalyst comprises the following steps: mixing a ferric salt solution and a Na2S solution or a NaHS solution, performing a precipitation reaction, and obtaining a precipitation reaction system; and aging the precipitation reaction system, and performing solid-liquid separation to obtain the sodium ferrous disulfide catalyst.The preparation method of the NaFeS2 catalyst is simple in process, mild in preparation condition, does not need heating and pressurization, has a wide source of raw materials, is low in cost, and is easy to be industrialized.The obtained sodium ferrous disulfide has high catalytic activity as a catalyst for direct coal liquefaction, and the oil yield and conversion rate of direct coal liquefaction are higher than those of a catalyst used in the industry at present.

The application discloses a kind of nickel-iron layered double hydroxide / iron oxide composite material and preparation method thereof, main preparation steps are respectively configured ferric salt and triethanolamine solution;The complex solution of ferric ion and triethanolamine is obtained after triethanolamine solution is added dropwise into ferric salt solution, and then the solution is treated using microwave hydrothermal to obtain iron oxide precursor dispersion;After the mixed solution of nickel salt and triethanolamine is configured, it is added into iron oxide precursor dispersion and is mixed uniformly by ultrasonic treatment;The mixture is transferred to microwave hydrothermal reaction bottle, and then microwave hydrothermal treatment is carried out, after treatment is completed, precipitated product is washed by centrifugation using deionized water and ethanol, and finally vacuum drying obtains nickel-iron layered double hydroxide / iron oxide composite material.The nickel-iron layered double hydroxide / iron oxide composite material prepared by the microwave hydrothermal method of the application has simple preparation process and shows good electrochemical oxygen evolution activity.

The invention discloses a preparation method and application of Zr-MOF modified magnetic straw biochar filler, and belongs to the technical field of water pollution treatment and ecological remediation, the method comprises the following steps: adding powdery straw into a solution of ferrous ions and ferric ions, stirring and performing ultrasonic treatment, and performing high-temperature pyrolysis on the dried powdery straw to prepare magnetic biochar; zirconium salt, the magnetic straw biochar and terephthalic acid are added into an N, N-dimethylformamide solution, the mixture is stirred and subjected to ultrasonic treatment, then the mixture is put into a polytetrafluoroethylene reaction kettle for a reaction, after the reaction is finished, N, N-dimethylformamide and absolute ethyl alcohol are used for cleaning, and after drying, the Zr-MOF modified magnetic straw biochar filler is obtained. Plant straw is used as a biochar raw material, biochar is modified through Zr-MOF and ferric salt, the porous structure and the specific surface area of the Zr-MOF modified magnetic straw biochar filler can be remarkably improved, the structural stability and the adsorption activity of the filler can be enhanced, refractory organic pollutants in a water body are efficiently removed, and soil pollutants are adsorbed and fixed.

The invention relates to the technical field of functional food, in particular to a polypeptide composition for regulating menstruation and nourishing blood and a preparation method thereof, and the polypeptide composition comprises the following raw materials: a Chinese wolfberry extract, an astaxanthin-fish oil co-coated preparation, a red algae oligosaccharide iron complex, maltodextrin and folic acid. In the polypeptide composition for regulating menstruation and nourishing blood and the preparation method thereof, the astaxanthin-fish oil co-coated preparation stably wraps the strong antioxidant astaxanthin and the fish oil through a complex coacervation microencapsulation technology, so that excessive free radicals generated by menstrual physiological stress can be efficiently eliminated, inflammatory response of uterine tissues can be relieved, and discomfort symptoms such as dysmenorrhea and the like can be relieved; according to the red algae oligosaccharide iron complex, oligosaccharide is used as a natural carrier of an iron element and is absorbed in an oligosaccharide iron chelating form in intestinal tracts, the absorption way of traditional ferric salt is avoided, the bioavailability is greatly improved, the iron element can be efficiently and mildly supplemented, and iron-deficiency anemia is improved.

The invention belongs to the technical field of preparation of iron oxide powder, and particularly relates to a production method of high-efficiency and environment-friendly high-purity iron oxide powder, which comprises the following steps: preparing soluble iron salt into an aqueous solution, adding a dispersing agent into the aqueous solution, and uniformly stirring; carrying out atomization treatment on the obtained solution through a pressure type atomizer or an airflow type atomizer; the atomized liquid drops enter a high-temperature reaction furnace, and air or oxygen is introduced into the high-temperature reaction furnace at the same time until atomization is finished; a product obtained after reaction enters a cyclone separator along with airflow for preliminary separation, and then fine collection is performed through a bag-type dust collector; and washing the collected ferric oxide crude product with deionized water for multiple times to remove impurity ions left on the surface, and drying. The method has the advantages of compact process flow, high reaction speed and controllable product performance. And the reaction contact area is increased through the atomization process, so that the oxidation reaction is rapidly carried out, the problem of non-uniform particle size distribution or easy agglomeration of the product in the traditional method is avoided, and the production efficiency is improved.

The present invention provides an iron phosphate adsorbent used in pre-concentration of a low-concentration lithium-containing solution. The iron phosphate adsorbent is a mixture of ferric phosphate and a calcium compound, and the mass ratio of the mixture is: ferric phosphate:calcium compound=1:(0.1-1). The present invention further provides a use of an iron phosphate adsorbent in pre-concentration of a low-concentration lithium-containing solution. The adsorbent of the present invention has low cost and simple preparation method, and preliminary concentration of a low-concentration lithium-containing solution can be achieved without adding an organic matter and using the technical means of evaporation for concentration, thereby avoiding organic pollution and reducing energy consumption.

The invention discloses a catalyst and application thereof.The catalyst is obtained by firstly preparing a precursor, then calcining the precursor and conducting acid pickling, and the precursor is obtained by firstly dissolving ferric salt and a metal chelate in a solvent, adding nano metal oxide into the system, conducting uniform mixing and then removing dissolution; the finally obtained catalyst is a porous material with iron monatomic loaded on nitrogen-doped carbon, the specific surface area is large, the catalytic effect is improved, the raw material cost is low, and the preparation process is simple; in addition, the catalyst disclosed by the invention is good in stability and good in recoverability; when the catalyst is used for catalyzing oxidation of amino-containing compounds into nitrile compounds, the reaction conditions are mild, the substrate adaptability is good, the reaction is carried out in a water phase, no additional organic reagent needs to be added, the selectivity is good, and the product yield is high.