29 results about "Soluble iron" patented technology

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 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 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 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 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.

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 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 discloses a preparation method of a conductive biochar composite high-conductivity material, which comprises the following steps: a) cleaning and drying a biomass raw material, and cutting the biomass raw material into blocks; b) heating the biomass to 400-600 DEG C, and carrying out pre-carbonization; c) mixing the pre-carbonized biochar with an iron salt solution, so that iron ions are uniformly distributed on the surface and in pores of the biochar; d) heating the iron-loaded biochar in an inert atmosphere for catalytic graphitization, so that iron species promote carbon structure rearrangement and graphite microcrystal formation; e) removing soluble iron ions and by-products to obtain high-conductivity biochar; and f) mixing the high-conductivity biochar obtained in the step e) with a ferric salt solution, carrying out a co-precipitation reaction to load ferroferric oxide nanoparticles on the surface and in pores of the high-conductivity biochar in situ, and washing and drying to obtain the conductive biochar composite high-conductivity material. According to the invention, a graphite-like structure can be formed under a medium temperature condition, and high conductivity far better than that of traditional pyrolytic biochar is obtained.

The invention relates to a ferrite-hollow glass bead composite material and a preparation method thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The preparation method comprises the following steps: (1) dispersing amino-functionalized hollow glass beads, a bivalent soluble iron salt and a trivalent soluble iron salt in water, and carrying out a co-precipitation reaction under an alkaline condition; and (2) carrying out hydrothermal crystallization reaction on the reaction system after the coprecipitation reaction in the step (1) at 150-200 DEG C. Through the optimized two-step process, high-quality and complete coating of the ferrite shell layer is realized, and the product performance is remarkably improved. The preparation method disclosed by the invention does not need complex equipment, is mild in reaction condition and simple in process flow, and is suitable for industrial large-scale production.

This invention relates to an iron plating solution for manufacturing polishing pad dressing devices, comprising: an oxalic acid complex of ferric ions, a pH buffer, a chloride salt auxiliary reagent, a stress reliever, and a wetting agent; the pH of the iron plating solution is 3.0-3.8. This invention provides a method for preparing the iron plating solution for manufacturing polishing pad dressing devices. This invention provides an electroplating process for the iron plating solution for manufacturing polishing pad dressing devices. This invention also provides a polishing pad dressing device obtained by the electroplating process of the iron plating solution for manufacturing polishing pad dressing devices. The iron plating solution of this invention uses ferric ions as the main salt, and uses ammonium oxalate to complex with ferric ions to form a stable soluble iron salt, eliminating the oxidation problem of commonly used divalent ferric ion main salts in the plating solution, preventing the formation and precipitation of ferric hydroxide, and solving the stability problem of the iron plating solution.

The present application relates to the technical field of defluorination, and discloses a defluorination agent and application and a defluorination method.The defluorination agent contains a water-soluble aluminum salt, a water-soluble iron salt and a water-soluble rare earth metal salt;in the defluorination agent, the molar ratio of aluminum elements, iron elements and rare earth elements is 350-560:1:3-20.When the defluorination agent is applied to low-fluorine wastewater treatment, it has the advantages of high defluorination efficiency, low cost, simple preparation process and low sludge yield.

The application belongs to the technical field of sewage treatment, and discloses a kind of reinforced phosphorus release composite carbon source prepared by industrial by-products and a preparation method and application thereof.The method mixes organic acid salt and crude glycerol without chemical modification treatment to obtain a first carbon source unit premix solution, mixes monosaccharide and molasses without enzymolysis treatment to obtain a second carbon source unit premix solution, then mixes the two according to a proportion, adds soluble iron salt and stirs uniformly to obtain the composite carbon source.The whole process only involves normal temperature and pressure physical mixing, without any chemical modification or enzymolysis treatment step, with simple process and low cost.The obtained composite carbon source provides multi-level synergistic supply through quick-acting carbon source, medium-speed carbon source and slow-release carbon source, and cooperates with the chemical auxiliary action of trace iron salt, to effectively promote the anaerobic phosphorus release reaction of polyphosphorus bacteria in the reinforced biological phosphorus removal process, significantly improve the phosphorus release rate and polyphosphate reserve, while greatly reducing the carbon source use cost, with process simplicity, functional specificity and cost saving.

The present application relates to a method for in-situ remediation of chlorinated hydrocarbon contaminated soil and groundwater and its application, which adds nutrient aid solution and sulfate-reducing bacteria agent into the chlorinated hydrocarbon contaminated soil and groundwater, the nutrient aid contains organic acid salt and ferrous salt with complexation. In the method of the present application, the organic acid salt as nutrient aid promotes the growth of sulfate-reducing bacteria, which reduces sulfate to negative bivalent sulfur, and the negative bivalent sulfur reacts with divalent iron ion to generate ferrous sulfide; the organic acid salt as complexing agent forms water-soluble complex with iron ion, and promotes the dissolution of iron in non-water-soluble iron oxide in soil particles, which greatly increases the generation amount of ferrous sulfide. The organic acid salt prevents the passivation of ferrous sulfide after reducing chlorinated hydrocarbon. The above-mentioned water-soluble complex of organic acid ferrous salt, ferrous sulfide and sulfide system can efficiently reduce high-concentration chlorinated hydrocarbon pollution at low cost, solve the inhibition of high-concentration chlorinated hydrocarbon on anaerobic dehalogenation bacteria, and lay a foundation for subsequent combined use of anaerobic dehalogenation biological remediation technology.

The invention belongs to the technical field of environmental engineering, and particularly relates to a gradient enrichment and separation treatment method for heavy metal wastewater. The method comprises the following steps: mixing the heavy metal wastewater with pyrosulfite and water-soluble ferric salt, and adding alkali to adjust the pH value to 5-5.5 to obtain chromium slag and first treated wastewater; mixing the first treated wastewater with a thiourea solution, and adding alkali to adjust the pH value to 6.2-6.8 to obtain copper slag and second treated wastewater; mixing the second treated wastewater with a carbonate solution, and adding alkali to adjust the pH value to 8.5-9 to obtain zinc slag and third treated wastewater; and mixing the third treated wastewater with the sludge seed crystal, and sequentially carrying out first-stage alkali addition to control the pH value to be 9.5-10 and second-stage alkali addition to control the pH value to be 11-11.5 to obtain nickel slag. According to the method, efficient separation of multiple metals is realized, and each metal forms a single high-purity precipitate, so that subsequent resource utilization is facilitated. A large amount of coagulant does not need to be added, and economic benefits are improved.

The present application belongs to the technical field of agricultural fertilizer, and particularly relates to a medium / trace element compound fertilizer containing water-soluble orthosilicic acid and a preparation method thereof. The compound fertilizer comprises the following components in parts by weight: 10-110 parts of water-soluble orthosilicic acid, 10-90 parts of soluble calcium salt, 5-20 parts of soluble magnesium salt, 0.5-5 parts of soluble iron salt, 0.5-10 parts of soluble manganese salt, 0.5-10 parts of soluble zinc salt, and 1-10 parts of potassium dihydrogen phosphate. The compound fertilizer can help improve photosynthesis of crops, increase mechanical strength of stems and stalks of crops, enhance air permeability in crops, prevent root decay and early decline, enhance drought resistance, pest resistance, cold resistance, salt resistance, dry hot wind resistance and other stress resistance of crops, and improve utilization rate of nitrogen, phosphorus, potassium and boron fertilizers, thereby greatly improving yield of crops.

This invention provides a method for preparing the selective oxidation catalyst FeMo@ZSM-22. The method includes: preparing a mixed metal salt solution by dissolving soluble molybdate and soluble iron salt; ultrasonically dispersing ZSM-22 molecular sieve powder in deionized water to obtain a molecular sieve suspension; slowly adding the mixed metal salt solution dropwise to the molecular sieve suspension under rapid stirring, and adding a precipitant to adjust the pH to 2.0-5.0; and obtaining the FeMo@ZSM-22 catalyst after microwave aging, washing, drying, and calcination. This invention incorporates ZSM-22 molecular sieve in situ during the co-precipitation synthesis of the FeMo catalyst, achieving a high degree of synergy between the redox sites (FeMo) and the weakly acidic sites (ZSM-22) at the nanoscale. The resulting catalyst is used for the direct selective oxidation of dimethyl ether to formaldehyde, not only overcoming the seesaw effect between activity and selectivity in traditional pure metal oxide catalysts, but also exhibiting extremely low preparation cost, good long-term anti-coking stability, and promising prospects for large-scale industrial production.

The present application relates to the technical field of lithium iron phosphate positive electrode material, and more particularly to a carbon-coated lithium iron phosphate detection method based on water soaking iron steady state stage, which comprises the following steps: after removing free moisture on the surface of the LFP@C to be detected, mixing with ultrapure water and soaking in a sealed environment; during the soaking process, sampling at preset time intervals, filtering and detecting the soluble iron and phosphorus content in the obtained filtrate; and drawing an iron content-time curve and a phosphorus content-time curve; extracting an iron content linear slow rising stage from the iron content-time curve; and based on the iron content and phosphorus content within the time range of the iron content linear slow rising stage, evaluating the performance of the carbon-coated lithium iron phosphate to be detected. The present application realizes rapid and accurate evaluation of the reduction property and interfacial bonding force of the carbon coating layer of the carbon-coated lithium iron phosphate to be detected.

This invention discloses a method for preparing a hollow fibrous barium ferrite, specifically in the field of composite materials. The method comprises three steps: First, polyvinylpyrrolidone is dissolved in a polar solvent and stirred until completely dissolved. A soluble barium salt, a soluble iron salt, and citric acid are then added in proportion to prepare a spinning precursor sol. Second, the spinning precursor sol is extruded through an injection device, with an air source flow at the outlet to blow the sol into filaments, which are then collected to obtain a barium ferrite precursor fiber sponge. Third, the barium ferrite precursor fiber sponge is heated and sintered until fully sintered, and then naturally cooled to obtain the hollow fibrous barium ferrite. The hollow barium ferrite synthesized by this invention achieves adjustable grain configuration and macroscopic hollow structure. Its impedance matching performance and electromagnetic wave attenuation characteristics are good, making it suitable for applications in high-density perpendicular magnetic recording materials, microwave devices, and microwave absorbing materials.

The invention discloses an alkaline water electrolysis hydrogen production method and system. The alkaline water electrolysis hydrogen production method comprises the following steps: adding soluble nickel salt and soluble iron salt into alkaline electrolyte; injecting the alkaline electrolyte into an electrolytic bath, setting an anode and a cathode of the electrolytic bath to be nickel nets, and separating an anode chamber and a cathode chamber by using a composite diaphragm; and controlling the electrolytic bath to perform an electrolytic reaction. The alkaline water electrolysis hydrogen production method is low in cost, high in performance, convenient to operate and easy to implement industrially. According to the alkaline water electrolysis hydrogen production method, nickel ions and iron ions are added in a controlled mode at the same time, and a brand-new and independent nickel-iron catalyst layer is constructed on a nickel substrate through in-situ codeposition in the electrolysis process. Besides, the composition design of the electrolyte is combined with a specific diaphragm, so that the controllability and directionality of the deposition process are ensured, and the visual change (from turbidity to clarification) of the electrolyte is used as an index for process monitoring.

The present application relates to the technical field of contaminated soil remediation, and discloses a composite reagent for neutralization and passivation remediation of antimony mine acid soil and application thereof, which comprises finely ground blast furnace slag powder, ferrous sulfate heptahydrate and carbide slag. The present application utilizes the solid phase micro-interface acid etching mechanism among the components to pre-activate the alumina tetrahedral site on the surface of the slag, eliminate the hydration induction period, and solve the kinetic mismatch problem caused by the difference in dissolution rate of the easily soluble iron salt and the insoluble slag in the soil remediation process. The present application builds a crystalline environment of poor sulfur calcium aluminate, makes the antimony acid root ions in the soil enter the mineral lattice as a structural replacement component, realizes atomic-level chemical solidification of the antimony pollutants, reduces the antimony leaching concentration of the remediated soil under the condition of acid rain leaching, and utilizes the trace reducing components of the carbide slag to synergistically inhibit the generation of highly toxic pentavalent antimony, thereby realizing long-term and safe remediation of the acid soil.