61 results about "Soluble iron" 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 provides a preparation method of an iron and nitrogen co-doped biomass-based carbon material, which can be applied to the technical fields of environmental functional materials and advanced oxidation. The preparation method comprises the following steps: obtaining target charcoal precursor powder; mixing the charcoal precursor powder with soluble ferric salt and urea to form initial mixed powder, adding water into the initial powder, and drying after water bath to obtain mixed powder; and heating and calcining the mixed powder according to preset process parameters to obtain the iron and nitrogen co-doped biomass-based carbon material. The prepared iron and nitrogen co-doped biomass-based carbon material FeOx has a high specific surface area and a rich pore structure, FeOx is uniformly dispersed on a nitrogen-doped carbon substrate, ozone catalytic activity and electron conduction performance are improved, and reactive oxygen species (ROS) can be efficiently generated to degrade sulfamethoxazole.

The invention provides a catalyst for preparing small-diameter single-walled carbon nanotubes and a preparation method thereof.The preparation method of the catalyst comprises the steps that soluble ferric salt, soluble platinum salt and auxiliaries are weighed, mixed and dissolved in water, the mixture is stirred to be uniform, and a solution A is obtained; adding a pretreated carrier into the solution A, uniformly stirring, continuing to heat and evaporate to dryness, and grinding to obtain a solid B; finally, the solid B is subjected to in-situ reduction with hydrogen at 500 DEG C for 1 h and then purged with nitrogen, and the catalyst for preparing the small-pipe-diameter single-wall carbon nanotube is obtained. The Fe-Pt alloy is used as a catalyst, Fe is used as a main active metal, and carbon source cracking and carbon tube nucleation are driven; the synergistic effect of Fe-Pt can improve the carbon deposition resistance of the catalyst, prolong the service life of the catalyst, further effectively reduce the pipe diameter of the SWCNTs and significantly improve the overall quality of the SWCNTs.

The invention provides a potassium-dissolving bacteria-iron-based potassium-containing nano material and a preparation method thereof, and belongs to a bio-fertilizer technology, and the preparation method comprises the following steps: dispersing soluble iron salt in water to obtain a solution A; dispersing a soluble phosphoric acid source and potassium salt in water to obtain a solution B; dispersing a stabilizer in water to obtain a solution C; simultaneously dropwise adding the solution A and the solution B into the solution C at the same speed, controlling the pH value to be 2.5-4.0 through alkali liquor, stirring for reaction, standing and aging to obtain the iron-based potassium-containing nano material; inoculating potassium-dissolving bacteria into a liquid culture medium, and carrying out enlarged culture to obtain a bacterial suspension; and mixing the bacterial suspension with the iron-based potassium-containing nano-material to obtain the potassium-dissolving bacteria-iron-based potassium-containing nano-material. The iron-based potassium-containing nano-material contains potassium, the iron-based potassium-containing nano-material and the potassium-dissolving bacteria act together to form a dual potassium supply mechanism that the potassium-dissolving bacteria decompose soil potassium and the iron-based potassium-containing nano-material releases potassium, and the effect is far better than that of single use of a microbial inoculum or a common potash fertilizer.

The invention belongs to the technical field of pyruvic acid biological detection, and relates to a pyruvic acid sensing chip of a Prussian blue nano frame / gold nano composite material. The method comprises the following steps: adding soluble metal salt containing ferricyanide ions into water; the method comprises the following steps: adding soluble ferric salt and a complexing agent into water, mixing, and carrying out hydrothermal synthesis reaction to obtain PB powder; adding PB powder into ethanol, adding ammonia water for reaction, mixing with conductive carbon paste to obtain nano printing paste, and printing the printing paste on a substrate to form a working electrode; the preparation method comprises the following steps: preparing a working electrode, drying the working electrode, placing the working electrode in a chloroauric acid solution for constant potential electrodeposition, mixing a PBS solution of pyruvate oxidase, a polylysine solution and an EDC solution, dropwise adding the mixture on the surface of the working electrode, and drying to obtain the pyruvic acid sensing chip. The obtained pyruvic acid sensor can reach the sensitivity of 50.42 [mu] A.mM <-1 >. Cm <-2 >, and is simple in preparation process and relatively low in cost.

The application provides a method and device for deeply removing EDTA-Ca in a solution. The method for deeply removing EDTA-Ca in the solution comprises the following steps: S1, mixing and dispersing soluble iron salt and soluble copper salt in deionized water according to a certain molar ratio to obtain solution A. The method and device for deeply removing EDTA-Ca in the solution provided by the application can deeply remove EDTA-Ca in the solution by using a copper ferrite (CuFe2O4) and hydrogen peroxide compound system, without additional light, heating or adding other reagents. The system itself can generate free radicals with strong oxidizing ability, can realize efficient oxidative breakage, and can decompose the complex into small molecules such as CO2, H2O and NH3. The removal rate is fast, and the removal rate of EDTA-Ca can reach more than 99% within 0.5 hours at room temperature. The used material can be easily recycled from the solution by using the strong magnetic property of copper ferrite, and secondary pollution to the environment can be effectively avoided.

The application belongs to the technical field of tetracycline degradation, and discloses a preparation method of a cathode material for electrocatalytic degradation of tetracycline and application thereof, and solves the technical problems of poor tetracycline degradation effect, short service life of the catalyst and difficulty in reuse of the powdery catalyst in the prior art. The preparation method of the cathode material for electrocatalytic degradation of tetracycline comprises the following steps: configuring a solution containing soluble nickel salt, soluble iron salt and urea; loading the solution and a porous carrier into a reaction kettle for heat treatment; cleaning and drying the porous carrier after heat treatment to obtain a precursor; and performing annealing treatment on the precursor to obtain the cathode material for electrocatalytic degradation of tetracycline. The preparation method of the cathode material for electrocatalytic degradation of tetracycline has simple process, low cost and easy industrial production, and the obtained cathode material is convenient to use and regenerate, has long service life, can efficiently catalyze and activate PMS in an electrochemical environment, and improves the degradation efficiency of tetracycline.

The application belongs to the technical field of waste zinc oxide desulfurizer regeneration, and provides a waste zinc oxide desulfurizer regeneration method, which comprises the following steps: S1, crushing and screening the waste zinc oxide desulfurizer, adding the waste zinc oxide desulfurizer into a reaction kettle, and stirring after adding ammonia water; S2, passing in ammonia gas and continuing to stir; S3, adding a soluble iron salt and dropping hydrogen peroxide solution; S4, carbonizing by passing in carbon dioxide gas into the reaction kettle, adjusting the PH value of the solution, and then filtering to obtain filter cake and filtrate; S5, taking the filter cake to a sulfur melting kettle for recovery, taking the filtrate to an ammonia evaporation kettle, and performing cooling and filtering on the kettle liquid to obtain basic zinc carbonate filter cake; S6, drying, calcining and crushing the basic zinc carbonate filter cake to obtain active zinc oxide powder; and S7, uniformly kneading the active zinc oxide powder with a binder, a pore-forming agent, basic zinc carbonate and water, extruding into a strip, drying, calcining and obtaining a zinc oxide desulfurizer product. The method can realize green recovery of the zinc oxide desulfurizer, does not generate waste gas and waste liquid, and is environmentally friendly.

The application discloses a preparation method of coal-based carbon nano-onions, which is prepared by taking coal powder as a carbon source and water-soluble iron salt as a catalyst, adding the coal powder into a nitric acid solution, heating and refluxing to obtain acid-oxidized coal powder, uniformly mixing the acid-oxidized coal powder with the catalyst, and performing in-situ high-temperature pyrolysis catalysis reaction in a tube furnace under an inert atmosphere to obtain a mixture of coal-based CNOs and hollow coal-based CNOs with metal particles. The coal-based carbon nano-onions prepared by the method can be used as a supercapacitor negative material conductive additive and applied to the preparation of supercapacitors.

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 invention discloses a nitrogen-phosphorus co-doped hollow cubic carbon material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage devices. The preparation method comprises the following steps: dispersing soluble zinc salt, soluble iron salt, 2-methylimidazole and hexadecyl trimethyl ammonium bromide in deionized water, stirring, mixing and reacting to obtain ZnFe-ZIFs; the preparation method comprises the following steps: dispersing phytic acid and ZnFe-ZIFs in methanol, and carrying out an etching reaction to obtain PA / HZnFe-ZIFs; the PA / HZnFe-ZIFs is placed in an inert atmosphere for carbonization treatment, and the ferrous phosphide modified nitrogen and phosphorus co-doped hollow cubic carbon material is obtained. The prepared carbon material is beneficial to adsorption of polysulfide, the shuttle effect can be slowed down, conversion between sulfur and the polysulfide can be accelerated, the preparation method is simple, the production cost is low, and the room-temperature sodium-sulfur battery assembled after the carbon material is compounded with sublimed sulfur to prepare a positive electrode material has excellent cycling stability and rate capability and is suitable for industrial production. The method is suitable for large-scale application.

The invention discloses a metallographic detection method for an ultra-low carbon steel resistance spot welding nugget zone, and belongs to the technical field of steel and iron material detection. The method comprises the following steps: firstly, cutting a metallographic specimen containing a complete welding part, cutting the metallographic specimen at the diameter position of a welding spot to obtain a specimen detection surface, grinding the specimen detection surface by using 150-850 # abrasive paper with different granularities, polishing, putting into a corrosive liquid consisting of hydrogen peroxide, organic acid, soluble ferric salt and water for corrosion, cleaning the specimen detection surface, drying, and then grinding the specimen detection surface by using the abrasive paper with different granularities. And placing under an optical microscope to collect microscopic images, and measuring the diameter of the nugget and the perimeter of the nugget area. The detection method provided by the invention is simple and feasible, has high efficiency, can clearly display the fusion area of the ultra-low carbon steel, and has a very good application prospect.

The invention relates to the technical field of water treatment materials and resource recovery, in particular to a chitosan-based hydrogel ball as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing an acidic aqueous solution of chitosan with soluble ferric salt to obtain an M-chitosan solution; wherein the metal salt is selected from soluble ferric salt or a mixture of soluble ferric salt and soluble calcium salt; the M-chitosan solution forms charged liquid drops by adopting electronic injection treatment, the charged liquid drops are dropped into alkaline solidification liquid, and the chitosan-based hydrogel balls are obtained after solidification treatment. The chitosan-based hydrogel ball prepared by the preparation method provided by the invention solves the bottleneck that a traditional phosphorus removal adsorbent is difficult to have efficient adsorption performance and recoverability at the same time. Besides, the chitosan-based hydrogel ball can be applied as a fertilizer after adsorbing phosphorus, so that a'pollution control-resource recovery 'closed loop is realized, and the chitosan-based hydrogel ball has the dual functions of efficient phosphorus removal and agricultural recycling.

The invention discloses a ferrous sulfide cleaning solution and a preparation method thereof, the cleaning solution is prepared from a suspending agent, a penetrant, a deoxidant, a solid deodorization passivator and water according to a certain weight part ratio, and the solid deodorization passivator is prepared from an oxidant, an activator, a passivator and a hydrogen sulfide inhibitor. During cleaning, the cleaning agent can permeate into a FeS deposition layer to enable the FeS deposition layer to loosen and fall off, FeS is converted into a soluble iron complex, secondary deposition of iron elements is avoided, cleaning waste liquid does not contain heavy metal ions, pollution to the environment is reduced, the treatment difficulty and treatment cost of the cleaning waste liquid are reduced, and the environmental pollution is reduced as much as possible; besides, in the cleaning process, generation of H2S can be reduced as much as possible, hydrogen sulfide can be adsorbed, release of hydrogen sulfide is inhibited, odor is eliminated, poison of hydrogen sulfide to operators is reduced, air pollution is reduced, and the cleaning agent is green and environmentally friendly.

The invention relates to an MXene-based composite electrode material and a preparation method and application thereof, and relates to the field of capacitive deionization. The MXene-based Fe3O4 composite material is synthesized by mixing soluble ferric salt, acetate, urea and a polymer in ethylene glycol through a one-step hydrothermal method, and the prepared electrode is applied to capacitive deionization (CDI) copper removal engineering. Experiments show that the specific capacitance of the composite material is 163.7 F / g under a three-electrode system, and the copper removal capacity can reach 53.9 mg / g within 30 min when 1.2 V voltage is applied. According to the invention, the three-dimensional layered MXene is compounded with the spherical Fe3O4 nanoparticles, so that on one hand, the interlayer spacing of the MXene is enlarged to promote ion diffusion; on the other hand, the volume expansion of Fe3O4 in the copper removal circulation process is relieved by utilizing the structure advantage, and the circulation stability is kept; in addition, the introduction of carbon can improve the conductivity of the composite material and increase the specific capacitance. Based on the research, the CDI technology is effectively applied to heavy metal removal.

The application relates to a double-coated positive electrode material and a preparation method thereof, and the preparation steps are as follows: a soluble ferrous salt solution is heated and stirred, a phosphorus source is added, heating and stirring are continuously carried out, a lithium source, an additive and water are added, a first mixed material is obtained after ball milling, sand milling and spraying; the first mixed material is calcined under an inert gas atmosphere and then crushed to obtain a first material; the first material is dispersed in a citric acid solution and continuously stirred, a soluble iron salt solution and a lithium carbonate solution are added, continuous stirring is carried out, and finally a carbon source is added, a second mixed material is obtained after sand milling and spraying; the second mixed material is calcined to obtain a double-coated lithium iron phosphate composite material. Through coating lithium ferrite on the surface of lithium iron phosphate and then carrying out carbon coating treatment, the double-coated lithium iron phosphate positive electrode material is formed, and the cycle performance, processing performance and safety performance of the material can be effectively improved.

The invention discloses a natural gas complex iron desulfurization solution and a preparation method thereof. The natural gas complex iron desulfurization solution comprises the following raw materials: soluble iron salt, an iron salt complexing agent, a chelating agent, an amino acid compound, inorganic weak acid amine salt, an alkali source and water. The molecular structure of the amino acid compound comprises at least one amino group and at least one carboxylic acid group, or comprises at least one amino group and at least one sulfonic acid group; the inorganic weak acid amine salt is any one or more of phosphoethanolamine and boric acid monoethanolamine. According to the desulfurization solution, the potential stability of iron ions in the alkaline solution is enhanced, the oxidation reduction potential of Fe < 3 + > / Fe < 2 + > is reduced, the desulfurization efficiency is improved, and byproducts are reduced. The treatment effect of the hydrogen sulfide is further improved, so that all the hydrogen sulfide in the tail gas is removed, and the sulfur capacity is improved to 1.0 g / L or above. And the removal rate of carbon dioxide reaches 90% or above.

To provide a liquid fertilizer containing silica and iron, which has excellent stability while suppressing a decrease in pH. [Solution] A liquid fertilizer containing acidic silica sol, supernatant of fermentation and distillation residue from distilled spirits, and water-soluble iron.

The application provides a sodium iron pyrophosphate phosphate-carbon composite positive electrode material, a preparation method and application, and the preparation method comprises the following steps: uniformly mixing a soluble iron source, a hardly soluble iron source, a sodium source, a phosphorus source, a carbon source, a complexing agent, a dispersing agent and a solvent, reacting to obtain a sol, drying the sol to obtain a xerogel, and sintering to obtain the sodium iron pyrophosphate phosphate-carbon composite positive electrode material; and the molar ratio of the soluble iron source and the hardly soluble iron source is (2.3-2.7):1. The application adopts a double iron source, namely, the soluble iron source and the hardly soluble iron source are matched. The soluble iron source can quickly dissociate to form a large number of uniform crystal nuclei in the initial stage of the reaction, realizes nucleation, the hardly soluble iron source can slowly deposit on the surface of the crystal nuclei and grow gently, effectively inhibits excessive coarsening and agglomeration of particles, so that the effects of optimizing particle size, regulating particle size distribution and improving particle morphology are achieved. In combination with the addition of the carbon source, the structure stability and excellent electrochemical performance of the obtained sodium iron pyrophosphate phosphate-carbon composite positive electrode are realized.

The present application belongs to the field of pesticide pollution remediation, and provides a preparation method of modified biochar, comprising the following steps: (1) preparing an alkali solution with a certain volume; (2) weighing plant starch and stirring and dispersing the starch in the alkali solution to obtain a starch dispersion liquid; (3) mixing a crosslinking agent with the remaining alkali solution, and then adding the mixture into the starch dispersion liquid dropwise, and stirring and reacting under constant temperature to obtain a reaction liquid; (4) adding soluble iron salt and alkaline potassium salt into the reaction liquid in sequence, and continuing to stir and react to obtain a mixture; (5) drying the obtained mixture to form a solid; and (6) placing the dried solid into a tube furnace, and pyrolyzing and carbonizing the solid under a nitrogen atmosphere at high temperature, and then performing acid pickling and drying to obtain starch-based modified biochar. The starch-based modified biochar prepared through chemical crosslinking modification and metal salt loading synergistic modification is suitable for remediation of long-acting herbicide contaminated water bodies and soil, and also has the effect of improving soil acidity.

A tannic acid-modified iron-biochar composite conductive carrier preparation method and an anaerobic treatment method for wastewater are provided. The preparation method of the conductive carrier includes calcining a wooden raw material at a high temperature to obtain biochar, drying, and sieving; dissolving the biochar and a soluble iron salt in deionized water and performing magnetic stirring; adding tannic acid after full dissolution, and adjusting the pH with an alkali solution; and transferring with pretreated carbon felt to a reactor for hydrothermal synthesis, naturally cooling, washing with deionized water, and vacuum drying to obtain the tannic acid-modified iron-biochar composite conductive carrier. The obtained tannic acid-modified iron-biochar composite conductive carrier is used for anaerobic wastewater treatment.

The application belongs to the technical field of environmental pollution remediation, and relates to a sulfur-manganese-iron co-doped porous carbon composite material and application thereof. The sulfur-manganese-iron co-doped porous carbon composite material is prepared according to the following steps: after biomass is immersed and treated by a potassium permanganate aqueous solution, pyrolysis is performed to obtain activated biological porous carbon; the activated biological porous carbon is mixed with a soluble iron salt to obtain a magnetic porous carbon material; a metal sulfide is loaded on the magnetic porous carbon material to obtain a sulfur-manganese-iron co-doped porous carbon composite material with a porous core-shell structure. The composite material can significantly reduce the cadmium and lead content in water bodies and soil, has the advantages of excellent remediation effect, high environmental adaptability, low cost and recyclability, and has great potential in the remediation application of cadmium and lead contaminated water bodies and soil.

The invention discloses a method for preparing a Fenton-like catalytic material by taking coal gasification slag as a raw material and application of the Fenton-like catalytic material. The method comprises the following steps: carrying out water washing and acid leaching on the coal gasification slag, and drying to obtain pretreated coal gasification slag; the pretreated coal gasification slag and a nitrogen-containing activator solution are mixed and impregnated, and N-coal gasification slag suspension liquid is obtained; mixing a soluble iron (III) salt solution with the N-coal gasification slag suspension, carrying out solid-liquid separation after ultrasonic dispersion, drying a solid, and carrying out microwave activation in a nitrogen atmosphere to obtain Fe-N-coal gasification slag; the preparation method comprises the following steps: ultrasonically dispersing Fe-N-coal gasification slag in organic alcohol, adjusting the pH value to 7.5-9.5, adding a shell metal oxide, carrying out a stirring and heating reaction, carrying out solid-liquid separation after the reaction is finished, taking a solid, drying, and calcining in a nitrogen atmosphere to obtain the coal gasification slag-based Fenton-like catalytic material.

The invention discloses a preparation method of a machine-made sand modifier and a machine-made sand modification method based on the modifier. The preparation method of the machine-made sand modifier comprises the following steps: mixing soluble ferric salt and calcium salt, then adding water to form a mixed solution A, dissolving sodium phosphate cellulose, sodium bicarbonate and polyacrylamide decomposition flora in water to form a mixed solution B, adding the mixed solution A and the mixed solution B into a sodium alginate solution to obtain a mixed solution C, and then carrying out ultrasonic oscillation, filtering and drying to obtain a machine-made sand modifier; the machine-made sand modifier is sprayed to the surface through a sodium citrate solution to be wetted, then placed for a period of time and then added into machine-made sand, water is added to pre-wet aggregate, and modified machine-made sand is obtained after stirring and standing are conducted for use. Through preparation of the machine-made sand modifier microspheres, the problems that the viscosity of a concrete mixture is increased and the slump retaining performance is reduced due to machine-made sand are solved by utilizing the synergistic effect of the microsphere form and attachments of the microspheres, and the mechanical property and the volume stability of concrete are improved.

This invention relates to a method for extracting iron from red mud using microwave biomass reduction-sulfuric acid leaching-electrolytic deposition, belonging to the field of resource comprehensive utilization and hydrometallurgical technology. The method first involves uniformly mixing red mud with a biomass reducing agent, then using a microwave field for rapid and efficient reduction, converting the sparingly soluble iron oxides in the red mud into readily soluble elemental iron or low-valence iron oxides. The reduction product is then leached with sulfuric acid, allowing the iron to enter the solution and separate from most impurities. Finally, the iron-rich leachate is electrolytically deposited to directly obtain high-purity electrolytic iron. This invention utilizes the selectivity and holistic nature of microwave heating, coupled with the green and renewable characteristics of the biomass reducing agent, to achieve efficient, energy-saving, and environmentally friendly recovery of iron from red mud. The process is short, energy-efficient, and has significant industrial application prospects.

The invention discloses a synergistic sludge conditioning method based on ferric salt preloading and catalytic ozonation, and relates to the technical field of sludge treatment. The synergistic sludge conditioning method sequentially comprises the following steps: 1) iron salt preloading: adding water-soluble iron salt into sludge, introducing Fe < 2 + > and Fe < 3 + >, and uniformly mixing; the water-soluble ferric salt comprises a divalent ferric salt and a trivalent ferric salt; the adding amount of the water-soluble ferric salt is 1-10% of the weight of the sludge dry solid; 2) catalytic ozonation: ozone is introduced into the sludge mixture preloaded by ferric salt for mixing; the adding amount of the ozone in the sludge mixture is 5-20 mg / L. According to the method disclosed by the invention, through synergistic preloading of Fe < 2 + > and Fe < 3 + > and process sequence optimization, ozone-ferric salt combination is upgraded from simple physical superposition to efficient chemical catalysis, so that the oxidation efficiency and the dehydration efficiency are improved.

The invention relates to the technical field of zinc air battery catalysts, in particular to an iron-nitrogen co-doped modified coal pitch-based graded porous carbon material as well as a preparation method and application thereof. A nitrogen source, soluble iron salt, a pore-foaming agent and a template agent are introduced into medium-temperature coal pitch, and heat treatment, acid pickling and carbon dioxide activation treatment are sequentially performed to prepare the iron-nitrogen co-doped modified coal pitch-based graded porous carbon material. According to the iron-nitrogen co-doped modified coal pitch-based graded porous carbon material obtained by adopting the method, impurities are not introduced, structural defects do not exist, nitrogen is uniformly doped, an ideal pore structure is achieved, and the problems that a nitrogen-doped carbon material in the prior art is poor in conductivity, limited in number of active sites and low in catalytic activity are solved.

The present application relates to the technical field of zinc-air battery catalyst, in particular to iron-nitrogen co-doped modified coal pitch-based hierarchical porous carbon material and its preparation method and application. The present application introduces nitrogen source, soluble iron salt, pore-forming agent and template agent into medium temperature coal pitch, and sequentially carries out heat treatment, acid washing and carbon dioxide activation treatment, to prepare iron-nitrogen co-doped modified coal pitch-based hierarchical porous carbon material. The iron-nitrogen co-doped modified coal pitch-based hierarchical porous carbon material obtained by the method of the present application does not introduce impurities, does not have structural defects, uniformly dopes nitrogen and has ideal pore structure, overcoming the problems of poor conductivity, limited number of active sites and low catalytic activity of the nitrogen-doped carbon material in the prior art.

The invention relates to a crude oil deironing agent, and belongs to the technical field of oil field chemicals. The crude oil deironing agent is prepared by carrying out ultrasonic mixing reaction on ammonium citrate, citric acid and alkyl trimethyl ammonium hydrogen sulfate in water at 50-80 DEG C. After the mixing reaction, the obtained product possibly contains O and S six-membered rings and S = O, S-O and other bonds, and can jointly play a role in chelating iron, so that the chelating deironing capability is improved, the dosage of the agent is reduced, and the production cost is reduced. And meanwhile, the crude oil deironing agent has good water solubility, and can realize conversion from oil-soluble iron in crude oil to water-soluble iron when being used for deironing the crude oil, so that the iron in the crude oil can be effectively removed. The crude oil deironing agent is good in deironing effect, free of corrosivity, low in deironing cost, free of environment pollution in the operation process and easy to popularize on a large scale.