72 results about "Alpha-FeOOH" patented technology

The invention discloses a preparation method of a supported FeOOH catalyst, and an electro-Fenton waste water treatment system. The invention belongs to the technical field of waste water processing. The invention is characterized in that active carbon is utilized as a carrier and ferrous sulphate is utilized as a precursor; through dipping, ethylene diamine tetraacetic acid and ammoniacal undergo an oxidation reduction reaction with active carbon and ferrous sulphate in the presence of oxygen to produce active carbon supported objects and then the active carbon supported objects are washed by deionized water and then are placed in a vacuum oven to be dried at a temperature of 40 to 50 DEG C for 10 to 12 hours to form a supported FeOOH catalyst; active components of the supported FeOOH catalyst comprise alpha-FeOOH and gamma-FeOOH; and under an applied electric field, an out-phase electro-Fenton oxidation system is composed of the supported FeOOH catalyst and hydrogen peroxide and canremove efficiently organic pollutants in waste water. The invention has effects and advantages that an out-phase catalyst can be separated from waste water easily and recycled, and an out-phase electro-Fenton oxidation system can operate in a neutral medium without need of PH adjustment and generation of chemical sludge.

The invention discloses a two-step oxidation production method for an iron oxide red pigment. According to the method, alpha-FeOOH is used as a seed crystal, a calcium mineral salt is used as a neutralizer in reaction process, and a byproduct obtained in preparation of titanium dioxide, i.e., ferrous sulfate, is used as a raw material; through accurate control of the reaction process, the iron oxide red pigment and a gypsum particle with different particle sizes are finally obtained, a good separation effect on the iron oxide red pigment and the gypsum particle is obtained, and the content of Fe2O3 in a final product is more than 99%; moreover, the particle size of the iron oxide red pigment is at a nanometer level and in a range of 100 to 200 nm, and granularity of the iron oxide red pigment is uniform. The method provided by the invention overcomes the problems of high production cost, secondary pollution to the environment, great potential safety hazards and the like in production of the iron oxide red pigment by using traditional methods; the byproduct ferrous sulfate obtained in preparation of titanium dioxide is utilized, and the raw material is easily available.

A method for producing iron oxide powder, of which the particle size and shape are controlled, comprising the steps of dissolving alpha-FeOOH in a glycol as a solvent to provide a solution; adding a controller for particle size and shape of the powder to the solution to provide a mixture; and reacting the mixture at a temperature of 150 to 300 ° C. for 1 to 48 hours.

The invention discloses a preparation method and application of a high-stability ordered mesoporous carbon loaded Fenton catalyst. The catalyst comprises a carrier and alpha-FeOOH growing on the surface of the carrier, wherein the carrier is ordered mesoporous carbon having undergone wet oxidation treatment. The preparation method comprises the following steps: subjecting ordered mesoporous carbon to wet oxidation treatment; then carrying out washing and drying, and soaking the ordered mesoporous carbon in a ferric nitrate solution; and subjecting a material obtained in the previous step to washing and drying and then to hydrothermal treatment in aqueous alkali so as to obtain the ordered mesoporous carbon supported Fenton catalyst. The catalyst prepared in the invention has good hydrophilicity and can be uniformly dispersed in water; aciculiform alpha-FeOOH grows on the surface of ordered mesoporous carbon, and the loading amount of ordered mesoporous carbon is adjustable; when applied to decolouring and phenol degradation of rhodamine B, the Fenton catalyst has good degradation effect in a wide pH scope; and the Fenton catalyst has the advantages of high activity, good stability, a wide pH application scope and small iron loss, and overcomes the problem that conventional homogeneous Fenton reactions produce iron-containing sludge and are restricted by the pH value of sewage.

The invention discloses a method for preparing gamma-Fe2O3 nanometer hollow magnetic microspheres, which comprises the following steps that: a certain quantity of sodium dodecylbenzenesulfonate (DBS) is added into 100ml of water, then a certain quantity of FeCl3.6H2O and Fe2(SO4)3 are added into the mixed liquid and stirred for 20 to 60 minutes, then urea is added into the mixed liquid, the mixed liquid is refluxed for 2 to 5 hours at a temperature of between 95 and 105 DEG C, and a precipitate is centrifugated, washed for a plurality of times, and dried at a temperature of 100 DEG C after alcohol being washed to produce an alpha-FeOOH precursor. The precursor is subject to heat treatment for 0.5 to 3 hours under an air atmosphere of between 250 and 400 DEG C, then the obtained product is subject to heat treatment for 1 to 3 hours under an H2 atmosphere of between 300 and 450 DEG C, finally the temperature is slowly decreased to between 150 and 250 DEG C, the atmosphere is changed from H2 to O2, and a final product is prepared after 1 to 3 hours of heat treatment. The product prepared by the method has high purity, definite compositions and crystal forms, and homogeneous hollow spherical structures.

The production method of one-dimentional alpha-FeOOH and alpha-Fe2O3 nano material. Said method includes the following steps: a. adding soluble strong-base wear-acid salt in the soluble salt solution in which divalent iron is dissolved, stirring them to produce yellow precipitate; b. placing the above-mentioned material into a reactor, heating, after the reaction is completed, cooling to room temperature and c. washing and drying so as to obtain one-dimensional alpha-FeOOH nano material, then calcining said one-dimentional alpha-FeOOH nano material at 240-360 deg.C to obtain one-dimentional alpha-Fe2O3 nano material.

The invention discloses a method for preparing a nanometer alpha-Fe2O3 material. The method comprises the steps of: (1) adding a strong oxidant in a Fe<2+> solution to oxidize Fe<2+> to Fe<3+>, and adding a strong alkali solution after activation of the Fe<3+> until the pH value is 6.0-11.0 so as to generate a Fe(OH)3 seed crystal colloid; (2) heating the Fe(OH)3 seed crystal colloid to be at 80-90 DEG C, adding the Fe<2+>, the Fe<3+> and Fe<0> in sequence, and reacting at a temperature of 80-90 DEG C for 8-12h to enable the Fe(OH)3 seed crystal colloid to grow to form nanometer alpha-FeOOH, wherein the destination pH value of the reaction is 3.5-6.0; and (3) filtering and washing the nanometer alpha-FeOOH to obtain an alpha-FeOOH filter cake, drying and crushing the alpha-FeOOH filter cake, and then calcining at a temperature of 300-400 DEG C to obtain the nanometer alpha-Fe2O3 powder material. The alpha-Fe2O3 prepared by using the method is small in particle size, good in dispersion, and narrow and even in distribution.

The invention provides a preparation method of FeOOH nanometer materials. By preparing a solution A and a solution B, the solution A is used alone or in combination with the solution B at a certain ratio to respectively prepare different-crystal-phase FeOOH nanometer materials under a certain condition, namely, alpha-FeOOH, beta-FeOOH and delta-FeOOH. The invention further discloses a cigarette filter tip added with any one of the different-crystal-phase FeOOH nanometer materials. By adding the different-crystal-phase FeOOH nanometer materials prepared by the preparation method, which is disclosed by the invention, into the cigarette filter tip, the release amount of tobacco-specific nitrosamine in cigarette mainstream smoke can be effectively decreased. The additives for the cigarette filter tip are safe and non-toxic and low in cost and the preparation method is simple and high in yield and is suitable for industrial production.

This invention provides a method for preparing Fe2O3-encapsulated Fe3O4 nanoparticles. The method comprises: preparing Fe3O4 by co-precipitation, converting gamma-FeOOH encapsulating Fe3O4 grains into Fe2O3 by heating at a low temperature, and forming Fe2O3-encapsulated Fe3O4 nanoparticles. XRD results show that the peaks of the product are identical to the standard peaks of gamma-Fe2O3 and Fe3O4, which proves that alpha-FeOOH, is converted into gamma-Fe2O3 that encapsulates Fe3O4 after calcination. The Fe2O3-encapsulated Fe3O4 nanoparticles have enhanced superparamagnetism, thus can be used for magnetic recording, magnetic flux, magnetic sealing, lubrication, magnetic resonance imaging, biological magnetic separation, magnetic targeting drugs and thermal therapy.

The invention discloses a one-dimensional rod-like spinelle ferrite of which the molecular formula is A1-x-y-BxCyFe2O4 ( A,B and C may be Co, Ni, Zn, Mn, Cu, Mg and Cd, x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1 and x+y is more than or equal to 0 and less than 1), and a preparation method thereof. The method is a chemical precipitation-local normalization method, which comprises: adding needlelike alpha-FeOOH or gamma-FeOOH into solution of slats of A,B and C, stirring uniformly, dripping precipitator solution, controlling pH value and obtaining a precursor; and roasting the precursor at a high temperature and obtaining A1-x-y-BxCyFe2O4. The invention has the characteristics that: the prepared A1-x-y-BxCyFe2O4 has an obvious one-dimensional rod-like shape characteristic; the length-to-diameter ratio of the particles of the A1-x-y-BxCyFe2O4 is more than or equal to 4, and the length of the particles reaches nanometer grade, and the particle size distribution is narrow; and different precipitators can be selected, and the particle size of the A1-x-y-BxCyFe2O4 is controlled by synthesis conditions including the roasting condition of the precursor, the types of the salts of A,B and C or the values of x and y and the like. The method makes process simple and reaction process easily controllable and is suitable for industrial production.

The invention belongs to the field of electrode materials of electrochemistry, and in particular to a preparation method of an iron-sulfur compound and a preparation method of an iron-sulfur compound composite material. The invention solves the problems of high cost and poor vulcanization effect in an iron-sulfur compound production process at present. The preparation method of the iron-sulfur compound comprises the following steps: 1) preparing a precursor A, wherein the precursor A is oxide alpha-FeOOH of iron or F-MIL (Materials from the Lavoisier Institute); 2) respectively weighing the precursor A and powdered sulfur, placing same into a porcelain boat, wherein the mass ratio of the precursor A to the powdered sulfur is between (1 to 20) to (1 to 30); placing the porcelain boat into an annealing furnace, performing annealing reaction in protective gas so as to obtain the final product iron-sulfur compound, wherein the precursor A and powdered sulfur are uniformly mixed and placed in the porcelain boat or the precursor A and powdered sulfur are arranged on two sides of the porcelain boat separately, the constant temperature ranges from 400 DEG C to 500 DEG C, the time for constant temperature is 1-2 hours. Sulfide nanorods prepared according to the invention is uniform in morphology and excellent in electrochemical performance; the operation is simple, the reaction period is short, the cost is low, and the preparations are suitable for batch production.

The invention provides a nano ferric oxide-cationic polyelectrolyte coupled multielement composite flocculant, relating to an inorganic-organic composite flocculant. The invention provides a novel high-efficiency composite flocculant compounded by nano ferric oxide and cationic polyelectrolyte, wherein the nano ferric oxide is nano alpha-FeOOH, Fe3O4, alpha-Fe2O3, gamma-Fe2O3 and the like, and the cationic polyelectrolyte is polyamine, polyacrylamide, poly (diallyldimethylammonium chloride), chitosan and the like. The composite flocculant provided by the invention is applicable to micro-pollution water source strengthening treatment, the treatment effect on toxic and harmful pollutants (heavy metals, toxic organic matters and the like), humic acid and chromaticity is higher, and the composite flocculant provided by the invention has the advantages of good separating effect, rapid sedimentation, low effluent turbidity, wide pH application range and the like.

The invention discloses an iron-based catalyst for co-liquefaction of kerosene. Nanometer alpha-FeOOH is taken as a main active component of the catalyst, few secondary active elements Ni and Co are doped, and few Al and Zn elements are added for increasing the dispersity of FeOOH, so that the overall activity of the catalyst can be promoted. Meanwhile, the activated carbon in a large specific surface area is taken as a carrier, and the active component of the catalyst is further dispersed, so that high catalytic activity is shown in the co-liquefaction reaction of kerosene and the service life of the catalyst in the co-liquefaction reaction of kerosene is prolonged. In the co-liquefaction reaction taking the catalytic cracking oil slurry as a solvent, under the synergic effects of all the components, the catalyst can show an excellent catalytic property, metal impurities in the raw materials and coking precursors generated in the reaction process can be absorbed, and thus the coking and blocking of the inner wall and the inner component of a reactor can be effectively prevented.

The invention belongs to the technical field of weather-resistant steel surface pretreatment, relates to corrosion of weathering steel materials in an atmospheric environment, in particular to a stabilizer for promoting the formation of a weather-resistant steel rust layer and a preparation method of the weather-resistant steel rust layer. The stabilizer comprises the following components of, nanoalpha-FeOOH, nano gamma-FeOOH, nano Fe3O4, CuSO4, Cr2(SO4)3, water-based acrylic acid and water; the nano alpha-FeOOH, the nano gamma-FeOOH, the nano Fe3O4, the CuSO4 and the Cr2(SO4)3 are uniformlydispersed in an aqueous acrylic acid aqueous solution; and the nano alpha-FeOOH, the nano gamma-FeOOH and the nano Fe3O4 can induce rust layer nucleation, meanwhile, the surface of the weather-resistant steel can be uniformly corroded in the service process through the characteristics of the water-permeable and oxygen-permeable stabilizer coating, and meanwhile, uniform corrosion causes uniform shedding of the rust layer stabilizer, so that the color of the weather-resistant steel structure is more uniform.

The invention relates to a preparation method of an alpha-FeOOH nano rod with uniform appearance, which belongs to the technical field of inorganic nonmetal nano material preparation. The preparation method of the alpha-FeOOH nano rod provided by the invention comprises the steps of: adding ethanol and the triblock copolymer of polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO-PPO-PEO) into the mixed aqueous solution of Fe<3> and Fe<2+>, then adding an NaOH solution until the pH of the mixed solution is 10-11, stirring and aging the mixed solution for 24 hours at room temperature to obtain a suspension, filtering or centrifugalizing the suspension to obtain solid precipitate, washing and then drying the precipitate at 30-50 DEG C to obtain the alpha-FeOOH nano rod. The alpha-FeOOH nano rod has uniform appearance, diameter of 20nm and length of 200-300nm, and can be used in the fields of dyeing, catalysis, gas detection, magnetic record, and the like. The preparation method which is simple and accessible can be implemented at normal temperature and normal pressure, thus remarkably reducing production cost.

The invention discloses a preparation method for siliceous earth/FeOOH composite materials in a micro-nano structure. The preparation method comprises the steps of evenly attaching FeOOH obtained by a water-bath method to the surface of siliceous earth, respectively characterizing prepared products by a field emission scanning electronic microscope and an X-ray diffraction instrument, and knowing that alpha-FeOOH is of an orthorhombic system structure, evenly distributed on the surface of the siliceous earth and even in morphological structure. The alpha-FeOOH of the composite materials is of a nano structure and has higher crystallinity and purity. During a preparation process, due to the fact that substances like templates are not added, follow-up processing is convenient to achieve, reaction temperature is low, reaction time is short, processes are simple, cost is low, and the preparation method is potentially applied to the field of environment.

The invention discloses a method for preparing an iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst. The method is characterized in that the catalyst is synthesized by means of a one-step hydrothermal method, an anhydrous sodium sulfite ion aqueous solution is slowly added dropwise into ferrous sulfate heptahydrate solution ionized water, high-speed stirring is carried out, thenthe whole mixed solution is put into a high-pressure reaction kettle, the high and constant temperature is kept for heating, after cooling is conducted to room temperature, high-speed centrifugal separation is conducted to obtain the iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst material, and synthesized FeS2 and alpha-FeOOH are both nano-scale materials, wherein the mole ratio of ferrous sulfate heptahydrate to anhydrous sodium sulfite is 1:(8+/-0.1), the reaction temperature of the ferrous sulfate heptahydrate and the anhydrous sodium sulfite in the high-pressure reaction kettle is 160-200 DEG C, and the reaction time is 1-2 hours. By means of the method, iron oxyhydroxide and iron sulfide are supported together, the efficiency is improved on the premise of savingresources, and the purpose of directionally removing heavy metal ions and macromolecular organic pollutants in water is achieved.

The invention provides a method of controllably preparing narrow particle size distribution submicron order alpha-FeOOH. The method comprises steps of: mixing a FeSO4 solution with a sodium hydroxide solution at a volume ratio of 2:5, and after fully dissolving, carrying out low frequency ultrasonic wave auxiliary treatment until a mixed solution is light green; and then, pouring the solution into a Teflon hydrothermal reactor with a packing ratio of 30-70%, insulating at 80-125 DEG C for 1-10h, extracting precipitate, carrying out centrifugal treatment after washing the precipitate, and then drying the precipitate at 80 DEG C in the air atmosphere. The method can be used for solving uncontrollable nucleation and growth problems, and the size distribution scope of the prepared submicron particles is very narrow.

The invention provides a fabrication method of a supercapacitor electrode. The fabrication method comprises the steps of synthesizing iron oxide, taking a synthesized Alpha-FeOOH and Alpha-Fe2O3 nanometer material as an electrode active substance, selecting a conductive agent and a binding agent to obtain a suspension liquid, coating the suspension liquid on a foamed nickel electrode which is cleaned in advance, removing a solvent and moisture, and compacting so that powder and the foamed nickel electrode are in close contact to form the supercapacitor electrode. According to the fabrication method of the supercapacitor electrode, provided by the invention, the fabricated supercapacitor electrode has relatively high crystallization degree and has excellent crystallinity and arrangement regularity of crystal structures, and a test shows that the supercapacitor electrode has good conductivity.

The invention relates to a method for preparing efficient nano ferric oxide drinking water type flocculants, belonging to the technical field of preparation of inorganic nonmetal nano materials. In the invention, the nano alpha-FeOOH flocculant is prepared by a coprecipitation method and the aluminium and silicon doped nano alpha-FeOOH flocculant is prepared through doping and surface modification. Compared with the traditional preparation methods, the method has the following advantages: the method is simple and practical; the nano particle size distribution is uniform; the preparation process flow is short; the method is environment-friendly; the manufacturing cost is low; and the prepared flocculants have higher treatment effects on toxic and harmful pollutants (such as heavy metals, toxic and harmful organic matters and the like), humic acid, chroma and the like.

The present invention relates to the preparation of alpha-FeOOH, beta-MnO2 and Co304 nanometer material to obtain a plurality of nanometer structure of different appearances, such as alpha-FeOOH nanobar,beta-MnO2 nanoline, Co304 nanocubes, etc,. by a method of agitating at normal temperature, or the combination of agitating at normal temperature and hydrothermal method, using ozone and corresponding bivalence soluble salt as raw material. The preparation method has the advantages of simple operation, gentle condition and high purity product. The raw material of the present invention is cheap and available without any organic compound and is characterized in low cost, environmental protection, strong practicability and wide application prospect.

The invention provides a BaCoxTixFe12-2xO19 (x=0-1) ferrite with one-dimensional bar appearance characteristic and a preparation method thereof. The method is a chemical precipitation-local regular method. The method comprises the following steps of: adding needle-like FeOOH (alpha-FeOOH or gamma-FeOOH) powder into solution of barium salt and cobalt salt, uniformly stirring the solution, and meanwhile, dropping Na2CO3 solution and ethanol solution of tetrabutyl titanate to prepare a precursor; and baking the precursor at a high temperature to obtain BaCoxTixFe12-2xO19 (x=0-1) magnetic powder with one-dimensional bar appearance characteristic. The method is stable and easy to repeat, has stable performance and low cost, and is also applicable for doping of multiple metal ions.

The invention relates to a BP-neural-network-based non-destructive determination method for characteristics of a steel corrosion product. The method comprises the following steps: (1) preparing pure-phase alpha-FeOOH and gamma-FeOOH; (2) preparing five or more samples of the mixtures prepared from alpha-FeOOH and gamma-FeOOH at different ratios; (3) manufacturing a working electrode used for electrochemical test; (4) mounting a three-electrode system comprising the working electrode, a counter electrode and a reference electrode, charging the working electrode with a constant current and detecting potential signals to obtain a chronopotentiometry V-T curve I; (5) drawing a standard curve to obtain two parameters Etau/2 and Qtau; and (6) determining a chronopotentiometry V-T curve II for a rusted sample, comparing the chronopotentiometry V-T curve II with the standard curve to obtain the rust layer characteristics of the rusted sample. By virtue of the method, the in-situ detection of the characteristics of the corrosion product is carried out without breaking the rust layers; the dependence on large-scale analysis and test instruments is avoided; the method can be applied to on-site detection of the corrosion product, research on the protection performance of the rust layers and research on the influence factors of atmospheric corrosion.

The invention belongs to the technical field of nanomaterial preparation, and relates to a preparation method for an alpha-FeOOH three-dimensional multi-grade microsphere.The three-dimensional multi-grade microsphere structure assembled by one-dimensional alpha-FeOOH nanorods is prepared by taking FeSO4.7H2O and CH3COONa as reaction raw materials and taking water as solvent through a hydrothermal synthesis method.The preparation process is simple, no special reaction equipment is needed, the reaction temperature is low, batched production is easily achieved, the microstructure of the product is controllable, and a potential value in studying on preparation and application of an iron oxide nanomateiral is achieved.