123 results about "Iron oxyhydroxide" patented technology

Disclosed are a resin substrate-based iron oxyhydroxide desulfurizing agent and a preparation method therefor, falling within the technical field of gas purification and treatment. In the present disclosure, sodium percarbonate is used as a raw material to prepare iron oxyhydroxide. Sodium percarbonate serves both as an alkaline precipitant and as an oxidant. P-aminophenol and formaldehyde are subjected to condensation polymerization to form linear phenolic resin, which is then modified with terephthalyl alcohol to connect into a cross-linked network structure resin. The resin is used as a substrate to obtain the resin substrate-based iron oxyhydroxide desulfurizing agent. The preparation method of the present disclosure is simple and achieves a larger sulfur capacity and desulfurization efficiency, making it suitable for the removal of hydrogen sulfide from waste gas.

A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

The invention discloses a device and a method for regenerating a powdery iron oxyhydroxide desulfurizer and purifying sulfur, and the device and the method are characterized in that invalid iron oxyhydroxide is completely reduced into a ferrous oxide and ferrous sulfide after sulfide is added, the reaction of an iron compound is enhanced through ultrasound and stirring, and the separation of the iron compound and the sulfur is promoted. Further fully aerating to fully oxidize the ferrous iron to generate new iron oxyhydroxide; at the moment, the iron oxyhydroxide is in a completely dispersed state, the single particle size is not higher than 1 micron, and small flocs with the particle size of 0-5 microns are formed in laminar water; the surface of the sulfur has hydrophobicity, and the sulfur is gathered to generate hydrophobic self-flocculation, so that large flocs with the particle size of 30-300 microns are formed in the laminar water; the mixture is flushed by water flows with different flow speeds, the iron oxyhydroxide with small particle size is flushed out at a certain flow speed, and the sulfur with large particle size is suspended in the grading pipe, so that the regeneration of the iron oxyhydroxide desulfurizer and the purification of the sulfur are realized.

Provided is a hydrogen sulfide removing agent that can be stably used while maintaining hydrogen sulfide removing ability equivalent to that of a hydrogen sulfide removing agent comprising an amorphous iron oxyhydroxide. This iron oxyhydroxide-based hydrogen sulfide removing agent contains amorphous iron oxyhydroxide and a crystalline component. The content of the amorphous iron oxyhydroxide is not less than the content of the crystalline component.

The invention discloses a preparation method of a high-crosslinking-degree polyamide solvent-resistant nanofiltration membrane, and belongs to the technical field of water and solvent treatment. Polyacrylonitrile (PAN) is used as a base membrane, an iron oxyhydroxide (FeOOH) middle layer is prepared through in-situ hydrolysis, then polyamine monomers and high-activity acyl chloride monomers react to synthesize a polyamide separation layer, and finally the polyamide solvent-resistant composite nanofiltration membrane with the adjustable crosslinking degree is prepared. The method has the advantages that the process is simple and mature, the conditions are green and mild, the surface hydrophilicity of the middle layer can be reasonably regulated and controlled through hydrolysis process parameters, the thickness of the polyamide separation layer is reduced, and the membrane flux is improved; meanwhile, due to the use of the rigid polyamine monomer, the prepared solvent-resistant nanofiltration membrane has a high degree of crosslinking, is endowed with good solvent resistance, can stably remove small molecular pollutants (the molecular weight is 200-1000Da) in solvents such as ethanol, acetone and tetrahydrofuran, and has a relatively wide application prospect.

The invention discloses a quick-dry salt-spray-resistant industrial water-based paint and a preparation method thereof, and relates to the technical field of paints. Cerium zirconium oxide is used for preparing nanofiber filler, cellulose is added into a precursor of the nanofiber filler, a carbon substance is obtained through calcination, then the mechanical property of the filler is enhanced, and an interpenetrating network structure with cerium oxide-zirconium oxide particles as nodes is formed in a hybrid material, so that the mechanical property of the coating is enhanced; then the ionic liquid is adsorbed on the carbon substance, then the nano filler is effectively modified, the mechanical property and corrosion resistance of the filler are improved, cerium oxide can inhibit the metal corrosion process, and in the later stage of corrosion prevention operation, cerium oxide and iron oxyhydroxide form a compact and stable surface rust layer structure, the corrosion rate is effectively decreased, and the corrosion resistance of the nano filler is improved. Zirconium oxide can greatly eliminate local micro-current corrosion of carbon substances and metal, and the corrosion resistance of the coating is further enhanced.

The application discloses a kind of composite desulfurizer suitable for oxygen-containing condition desulfurization and its preparation method and application, belong to desulfurizer technical field.The composite desulfurizer is double-layer composite structure;Wherein: outer layer is iron oxide hydroxyl layer, including iron oxide hydroxyl and first binder;Inner layer is copper zinc aluminum layer, including copper oxide, zinc oxide, alumina and second binder.The composite desulfurizer obtained in the application significantly improves the service life of desulfurizer under oxygen-containing condition, and the sulfur capacity of desulfurizer can be as high as 10~20%, and the simultaneous removal of organic sulfur and inorganic sulfur can be realized in one step, effectively reducing the desulfurization cost, with important application prospect.In addition, the preparation of double-layer structure composite desulfurizer is realized by double-layer extruding machine in the application, and the process is simple, which is beneficial to industrialized mass production.

The invention discloses a FeOOH / CNT composite layer modified diaphragm for a lithium-sulfur battery and a preparation method of the FeOOH / CNT composite layer modified diaphragm. The diaphragm takes a polypropylene diaphragm as a substrate, the surface of the diaphragm is modified with a composite layer composed of FeOOH and CNT, and the diaphragm is of a winding bar winding structure. The one-step synthesis is adopted, the reaction conditions are mild, and the process is simple. FeOOH enhances the adsorption effect on polysulfide by exposing abundant active sites, effectively inhibits the shuttle effect and improves the redox reaction kinetics; meanwhile, the CNT constructs a three-dimensional conductive network, the electron transmission path is shortened, and the sulfur positive electrode utilization rate and the interface conductivity are improved. Experimental results show that the initial specific capacity of the lithium-sulfur battery assembled based on the modified diaphragm reaches 1218.3 mAh g <-1 > at 0.2 C, the capacity fading rate of each circle is only 0.075% after 500 circles of circulation at 1C, and the lithium-sulfur battery shows excellent cycle stability and high specific capacity. The diaphragm provides an effective solution for improving the electrochemical performance of the lithium-sulfur battery, and has important application potential.

The invention discloses a device and a method for desulfurizing sulfide-containing wastewater and recovering sulfur, the device and the method utilize efficient reaction of iron oxyhydroxide and sulfide, excessive iron oxyhydroxide reacts to generate ferrous oxide and sulfur, and a small part of ferrous sulfide exists; the surfaces of ferrous sulfide and sulfur in a reaction product are provided with negative charges, and the surface of the residual unreacted iron oxyhydroxide is provided with positive charges, so that floc is formed through the electric neutralization flocculation action of several compounds and can be quickly precipitated; after precipitation, overlying water is treated desulfurized water, ferrous sulfide and ferrous oxide generated in the precipitate are aerated and oxidized in an iron regeneration device, iron oxyhydroxide can be regenerated, and residual sulfide in the ferrous sulfide is converted into elemental sulfur; and the generated iron oxyhydroxide can be used for treating the sulfide-containing water again, so that the sulfide-containing water is treated through reciprocating circulation, and the elemental sulfur and the iron oxyhydroxide are mixed together for continuous accumulation.

A method for making an iron-based oxide magnetic powder includes adding raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution to a reaction system to adjust the pH of the reaction system to 1.0 or higher and 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and thereafter the pH of the reaction system is neutralized to 7.0 or higher and 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide and then heated, whereby an iron-based oxide magnetic powder is obtained with a reduced content of fine and coarse particles, a particle shape close to a perfect sphere, and particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements.

The invention discloses a phosphate binder and a preparation method thereof, the phosphate binder is sucrose iron oxyhydroxide containing iron oxyhydroxide (III), sucrose and a mixture of one or more starches, the particle size range D50 of the sucrose iron oxyhydroxide is controlled to be 30.5-39.5 [mu] m or D90 is less than 200 [mu] m, so that tailing loss and material wall sticking in a spray drying process can be effectively reduced; the high yield of about 90% is obtained, and the iron release amount and the drying weight loss ratio are both superior to those of a small-particle-size group (D50lt; 30.5 [mu] m) and a large particle size group (D50gt; 39.5 [mu] m) or D90 is greater than 200 [mu] m, so that the stability of the pharmaceutical composition is improved; according to the preparation method disclosed by the invention, the D50 particle size distribution of the sucrose iron oxyhydroxide is controlled within a range of 30.5-39.5 microns or D90 less than 200 microns by regulating and controlling the solid content of the aqueous suspension of the iron oxyhydroxide (III), the sucrose and the starch, so that the product is high in yield and good in quality, and the economic value of industrial production of the product is greatly improved.

The present application belongs to the field of denitration agent preparation, and provides a selective non-catalytic reduction denitration agent and a preparation method thereof. First, urea is heat treated to change hydrogen bond strength and intermolecular force in the crystal, and increase thermal motion of urea molecules, so as to cause loose arrangement between molecules, increase exposure of reaction sites, and increase contact area of molecules, thereby increasing reaction rate. A phosphoric acid group is introduced into the urea after heat treatment, and phosphonated urea is formed through chemical reaction, so as to improve adsorption and reaction activity of the urea. This process helps to enhance the combination ability of urea and NOx, thereby improving the denitration efficiency. Appropriate amounts of sodium carbonate, sodium chloride and hydroxyl iron oxide are added to the reaction system, which helps to promote the activity improvement of the denitration agent, and can effectively deal with nitrogen oxide pollution in industrial waste gas.

The present invention relates to the technical field of intelligent materials, and specifically to a magnetorheological elastomer with high mechanical strength and a preparation method thereof. First, in this application, carbonyl iron powder and iron oxide hydroxide are used as raw materials, and they are polymerized with (3-aminopropyl)triethoxysilane to prepare magnetic groups. These magnetic groups can replace traditional magnetic particles to enhance the interfacial bonding force between magnetic particles and the rubber matrix in the magnetorheological elastomer. Moreover, in the preparation process of the magnetorheological elastomer of the present invention, multi-walled carbon nanotubes and soft carbon black are added, and epoxidized palm oil is added to improve the filler dispersion. The mechanical properties and magnetorheological effect of the magnetorheological elastomer prepared by this method have been greatly improved. And this modification will not affect the optimal volume concentration of magnetic particles in the magnetorheological elastomer.

A water treatment method for reducing the dissolved silica content thereof, the method being characterized in that it comprises at least one step of adsorbing the dissolved silica, the step consisting of passing the water through a reactor containing a granular adsorbent material consisting of iron(III) hydroxide and / or iron(III) oxyhydroxide grains, and at least one step of regenerating the adsorbent power of the granular material, the step consisting of bringing the granular material into contact with a base and at least one chloride.

The invention discloses a composite desulfurizing agent suitable for desulfurizing under an oxygen-containing condition as well as a preparation method and application of the composite desulfurizing agent, and belongs to the technical field of desulfurizing agents. The composite desulfurizer is of a double-layer composite structure. Wherein the outer layer is an iron oxyhydroxide layer and comprises iron oxyhydroxide and a first binder; and the inner layer is a copper-zinc-aluminum layer and comprises copper oxide, zinc oxide, aluminum oxide and a second binder. The service life of the obtained composite desulfurizer is remarkably prolonged under the oxygen-containing condition, the sulfur capacity of the desulfurizer can reach 10-20%, organic sulfur and inorganic sulfur can be removed at the same time in one step, the desulfurization cost is effectively reduced, and the composite desulfurizer has important application prospects. In addition, the preparation of the double-layer structure composite desulfurizer is realized through a double-layer banded extruder, the process is simple, and industrial batch production is facilitated.

The invention relates to the technical field of electromagnetic functional materials, and provides a frequency-band-adjustable ferromagnetic core-shell nanorod wave-absorbing material and a preparation method thereof.The preparation method comprises the steps that an iron oxyhydroxide precursor is prepared through a hydrothermal synthesis method, the iron oxyhydroxide precursor is reduced through a liquid-phase pyrolysis method, and nanorod-shaped ferroferric oxide is obtained; growing a carbon layer on the surface of the nanorod-like ferroferric oxide through a high-temperature sintering method to obtain the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer; and carrying out orientation arrangement on the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer through magnetic field control. According to the invention, cooperation of structural design and light weight, improvement, regulation and control of electromagnetic characteristics and improvement of electromagnetic wave absorption efficiency can be realized.

The invention relates to the technical field of desulfurizing agents, in particular to a reusable iron oxyhydroxide desulfurizing agent and a preparation method thereof. The problem that the activity of a traditional material is reduced due to sulfate accumulation and compact layer formation in a vulcanization-regeneration cycle is solved. The preparation method comprises the following steps: dissolving ferric nitrate and urea, adjusting the pH value to 1.8, and adding cerous nitrate and citric acid; heating, introducing zirconium oxynitrate, controlling the pH value at 3.7-3.9 for 2-3 hours, heating to 7.2, adding samarium nitrate and zirconium acetylacetonate, aging, and mixing with bentonite and ammonium bicarbonate for molding; and finally, carrying out segmented activation in a nitrogen and low-oxygen mixed atmosphere. The desulfurizer has high specific surface area and pore volume, the breakthrough sulfur capacity reaches 148-160mgS / g, the 10-time circulating sulfur capacity retention rate is 88-91%, and the desulfurizer is high in particle compressive strength, low in abrasion rate and suitable for the industrial desulfurization process.

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 present invention discloses a three-dimensional self-supporting nickel-iron-based composite flaky oxygen evolution catalyst and its preparation method and application. First, iron foam is oxidized to generate magnetite, and then it is added to a mixed solution of nickel chloride and sodium chloride for hydrothermal reaction to generate nickel-iron oxyhydroxide, thereby obtaining the catalyst. The catalyst obtained by the present invention has high conductivity, high specific surface area and high porosity, and is mainly composed of iron-based elements, and can be used as an anode oxygen evolution catalyst for electrolytic water hydrogen production, with excellent catalytic performance.

A fluorine-containing nickel iron oxyhydroxide electrocatalyst is used as an anode in an anion exchange membrane electrolyzer for hydrogen production.

The application discloses a preparation method and application of an ozone oxidation catalyst. 2+ The preparation method of the ozone oxidation catalyst comprises the following steps: adding a sandstone carrier, Fe, H2O2, an iron source material and wastewater into a fluidized bed reactor to obtain initial reaction liquid with pH of 4-5; swelling the sandstone carrier in the initial reaction liquid; and obtaining the sandstone carrier loaded with hydroxyl iron oxide crystals after reaction of the initial reaction liquid. The catalyst prepared by the application has a nano structure, high active component, and can realize degradation of a large category of wastewater such as coal chemical industry, coking and acrylic fiber by catalyzing ozone. The catalyst is simple and economical to prepare, has less active catalytic species dissolved in the running process, has a large pH range for degradation of the wastewater, and has the advantages of easy preparation, high efficiency, stability and low economic cost.

Disclosed are a resin substrate-based iron oxyhydroxide desulfurizing agent and a preparation method therefor, falling within the technical field of gas purification and treatment. In the present disclosure, sodium percarbonate is used as a raw material to prepare iron oxyhydroxide. Sodium percarbonate serves both as an alkaline precipitant and as an oxidant. P-aminophenol and formaldehyde are subjected to condensation polymerization to form linear phenolic resin, which is then modified with terephthalyl alcohol to connect into a cross-linked network structure resin. The resin is used as a substrate to obtain the resin substrate-based iron oxyhydroxide desulfurizing agent. The preparation method of the present disclosure is simple and achieves a larger sulfur capacity and desulfurization efficiency, making it suitable for the removal of hydrogen sulfide from waste gas.

Provided are: a novel complex capable of efficiently adsorbing and collecting arsenic (V) dissolved in water; and a novel arsenic adsorbent. This complex contains iron (III)-containing particles supported on microfibrous cellulose. At least a portion of the iron (III)-containing particles has an aspect ratio of 2 or more. The iron (III)-containing particles preferably contain at least one iron compound selected from iron oxides, iron hydroxides, and iron oxyhydroxides. This arsenic adsorbent contains the complex.

Provided is a hydrogen sulfide removing agent that can be stably used while maintaining hydrogen sulfide removing ability equivalent to that of a hydrogen sulfide removing agent comprising an amorphous iron oxyhydroxide. This iron oxyhydroxide-based hydrogen sulfide removing agent contains amorphous iron oxyhydroxide and a crystalline component. The content of the amorphous iron oxyhydroxide is not less than the content of the crystalline component.

The multifunctional high-capacity reinforced flocculant composite material comprises a Cu (II) removal flocculant, an Hg (II) removal flocculant, an AS (III) removal flocculant, an Ni (II) removal flocculant, an Sb (V) removal flocculant and an AS (V) removal flocculant. The Sb (V) and AS (V) removal flocculants are composite flocculants, the Cu (II) removal flocculant is an Al-Fe loaded flocculant, the Hg (II) removal flocculant is an AlZn50 alloy, the AS (III) removal flocculant is an AlZn20 alloy, and the Sb (V) and AS (V) removal flocculants are composite flocculants which take acrylamide (AM) as a substrate and are inoculated with FeOOH in the process of initiating polymerization. The flocculant composite material disclosed by the invention is suitable for meeting the requirements of high pollution concentration, complex form and speed and efficiency in an emergency process of various heavy metal coexisting wastewater, and is suitable for removing various heavy metal ions under the conditions of large water flow, high heavy metal ion concentration and the like.

The application discloses a method for preparing an ultra-low sulfur iron product and the ultra-low sulfur iron product, and relates to the technical field of high-purity iron products. The method comprises the following steps: obtaining a hydroxyl ferric oxide precursor; placing the hydroxyl ferric oxide precursor in a container, and keeping the temperature in the container at 400-800 DEG C; dehydrating and transforming the hydroxyl ferric oxide into a ferroferric oxide crude product; reducing the ferroferric oxide crude product into magnetite under a reducing atmosphere; oxidizing the magnetite into ferroferric oxide under an oxidizing atmosphere; repeating the reduction-oxidation steps at least once to obtain ultra-low sulfur ferroferric oxide, or repeating the reduction steps at least once to obtain ultra-low sulfur magnetite, or repeating the reduction steps at least once to reduce the ferroferric oxide into iron single substance to obtain ultra-low sulfur iron single substance. The reduction and oxidation steps are cycled to efficiently remove the sulfur wrapped in the crystal lattice and the sulfur in the deep layer of the particles, and meanwhile, the temperature of the fire desulfurization is lowered.

The invention provides a preparation method of a zero-valent copper / amorphous iron oxyhydroxide activated molecular oxygen catalyst, and belongs to the technical field of activated molecular oxygen advanced oxidation catalytic materials for sewage treatment. Then adding the amorphous iron oxyhydroxide and anhydrous cupric sulfate into distilled water, mixing, adding sodium borohydride, and carrying out reduction reaction to prepare the zero-valent copper / amorphous iron oxyhydroxide activated molecular oxygen catalyst; the catalyst prepared by the invention can be recycled and has high catalytic performance.

The invention discloses a composite gel material as well as a preparation method and application thereof, and relates to the technical field of gel materials. The composite gel material is prepared from the following raw materials: chitosan, modified iron oxide hydroxide and a cross-linking agent, the modified iron oxide hydroxide is aluminum ion doped iron oxide hydroxide. The composite gel material provided by the invention can be used as a soil remediation material, can be used for remediation of heavy metal contaminated soil, can effectively adsorb heavy metal ions, promote oxidation of arsenic and enhance the treatment effect of arsenic, has a good fixing effect on heavy metals, is beneficial to preventing migration and pollution of the heavy metals, and has a good application prospect. Meanwhile, the water-retaining property and the fertilizer-retaining property of the soil are remarkably improved, the problem that an existing soil remediation material cannot meet soil remediation and soil nutrition protection at the same time is solved, and the soil remediation material is an effective measure for pollution treatment and heavy metal remediation of the soil.

The invention belongs to the technical field of hydrogen preparation by electrolyzing water, and particularly relates to a CoOOH-FeOOH composite electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: loading CoO on a FeOOH / foamed nickel electrode to obtain a CoO-FeOOH / foamed nickel electrode; taking the CoO-FeOOH / foamed nickel electrode as a working electrode, forming a three-electrode system together with a reference electrode and a counter electrode, immersing one end of the three-electrode system into an alkaline electrolyte, and performing electrochemical activation to obtain a CoOOH-FeOOH composite electrode; according to the invention, CoOOH and FeOOH are compounded, so that the technical defects of cobalt oxide and iron oxyhydroxide are overcome; when the hydrogen production device is applied to hydrogen production by electrolyzing alkaline water, high-efficiency, stable and low-cost hydrogen production by electrolyzing water under the alkaline condition is realized.