210 results about "Dissolved iron" patented technology

A method of treating, in wastewater purification, sludge containing organic matter, divalent iron and phosphorus, in which the sludge that is treated is made to contain dissolved iron and phosphorus at a molar ratio Fe:P of above 1:1, the sludge is treated at 0-100° C. with an acid at a pH of 1-5 for dissolution of divalent iron and phosphorus from the sludge, the sludge is supplied with an oxidiser selected from hydrogen peroxide and percompounds, wherein divalent iron is oxidised by Fenton's reaction to trivalent iron, and (i) trivalent iron is precipitated as trivalent iron phosphate (ii) free radicals with a deodorisation and sanitation effect are formed by Fenton's reaction, the sludge is then dewatered at a pH of at most 7, and the aqueous solution obtained in dewatering is recirculated to the wastewater purification.

The invention provides an iron-based low-temperature SCR denitration catalyst and a preparation method thereof. Iron and cerium compounds are taken as active components, or iron, manganese and cerium compounds are taken as active components, titanium oxide is taken as a carrier, the molar ratio of iron, manganese and cerium is 1:(0.5-4):(0.5-1.5), and the molar ratio of iron and titanium oxide is 0.15-0.25. The preparation method comprises the steps of dissolving iron nitrate, manganese nitrate and cerium nitrate in deionized water, adding the titanium oxide, stirring intensely so as to mix the above compounds thoroughly, then performing ultrasonic mixing, putting the mixture into an oven for drying, calcining in an air atmosphere, and then grinding the mixture into powder. The iron-based low-temperature SCR denitration catalyst provided by the invention has an obvious advantage in cost, and meanwhile, the iron-based low-temperature SCR denitration catalyst has higher denitration efficiency under a medium and low temperature.

The invention relates to a C/Fe3C lithium ion battery negative material and a preparation method thereof, which belong to the field of the lithium ion battery negative material and electrochemistry. The lithium ion battery negative material consists of amorphous carbon and Fe3C. The preparation method of the material comprises the following steps of: dissolving iron phthalocyanine, pyrazine and asurfactant in an organic solvent for thermal polymerization; and performing heat treatment on a polymerization product in argon atmosphere or performing heat treatment on Prussian blue at a certain temperature under the protection of the argon atmosphere, wherein a discharge voltage platform of the negative material is at 0.75V in average; the reversible specific capacity of the material can be kept at 700mAh/g within a voltage range of between 0.005 and 3.5V at the charge and discharge rate of 100mA/g after 60 cycles and does not obviously attenuate; in addition, the material has high chargeand discharge rate performance and broad application prospect.

Oilfield completion, drilling, produced, flowback, and workover fluids containing iron are treated to remove the iron by passing them through a cavitation device together with an oxidizing agent and with the addition of lime. The cavitation device intimately mixes the oxidizing agent with the fluid while increasing the temperature of the fluid, thus promoting the oxidation reaction. Lime contributes to an increase in pH while promoting the formation of floc. Ferric hydrate and other solids or colloidal iron are removed in a filter capable of removing particles as small as 0.5 micron. The system may be enhanced by the addition of a bed of activated carbon capable of catalyzing the oxidation reaction.

The invention relates to a preparation method of a polymerized iron flocculant, which comprises the steps of: mixing a certain amount of ferrous salt (or ferric salt), inorganic acid and water under stirring condition to completely dissolve iron salt; adding a certain amount of oxidant and sufficiently stirring to completely oxidize ferrous ion into ferric ion; and adding a certain amount of inorganic base and polymerization inhibitor to partially hydrolyze and polymerize ferric ion, and then aging at normal temperature for some time to obtain modified polymerized iron flocculant. Compared with the prior art, the prepared modified polymerized iron flocculant has the advantages that the stability is improved, the bonding bridging capability is enhanced, alum flower is rapid in forming and large, the coagulation effect is improved and the like; and when the modified poly iron flocculant is used under certain conditions, the water outflow quality is not significantly influenced under the condition that the flocculation effect is significantly improved.

The invention relates to a preparation method of a monodisperse Alpha-iron oxide nanosheet, comprising the steps of 1) dissolving P123 in ethylene glycol, stirring, and continuing to dissolve iron nitrate in the ethylene glycol to obtain clarified solution, wherein the molar concentration of the iron nitrate in the clarified solution is 0.5-2 mol/L; 2) adding KOH solution into the clarified solution of step 1) to obtain reddish brown precursor solution; 3) hydrothermally reacting the precursor solution of step 2) at the temperature of 180-200 DEG C for 24-30 h to obtain the monodisperse Alpha-iron oxide nanosheet. The preparation method has a simple technical process, is easy to control, free of environmental pollution and low in cost and facilitates large-scale production; the obtained monodisperse Alpha-iron oxide nanosheet has excellent cycle performance as a lithium-ion battery anode material.

The invention relates to a catalyst for ternary copolymerization of norbornenes, tetrafluoroethylene and pentenes and a ternary copolymerization method. The catalyst is characterized in that the catalyst is prepared through the following method comprising the steps of: dissolving iron dichloride, a ligand and an alkyl metal compound in a solvent in a dry single-neck glass bottle in an inert gas atmosphere, sealing a bottle mouth through an emulsion pipe, keeping the constant temperature in a water bath at the temperature of 40-50 DEG C for 10-30min, and cooling to obtain an iron complex catalyst. Compared with the prior art, the catalyst provided by the invention is a novel iron complex catalyst which can produce catalytic activity in an nitrogen-protected system at a certain pressure and the temperature of 20-120 DEG C so as to catalyze the ternary copolymerization of the norbornenes with the tetrafluoroethylene and the pentenes, and a product after soaking in methanol is very easy to wash and separate. The catalyst has the characteristics of high copolymer yield, low reaction temperature, low price, easiness in obtainment, high catalytic efficiency and the like.

The invention relates to a kieselguhr loading solid superacid type Fenton catalyst preparation method, belongs to water treatment, and in particular relates to the kieselguhr loading solid superacid type Fenton catalyst preparation method which is mainly used for solving a problem of poor catalytic efficiency of a catalyst prepared by utilizing conventional kieselguhr as a carrier. The preparation method comprises steps of: 1, soaking original kieselguhr into an inorganic acid solution, and drying, screening and putting the soaked original kieselguhr in a muffle furnace to activate; 2, dissolving iron salt into deionized water, then adding the activated kieselguhr, dropwise adding alkali liquor to regulate the pH, ageing, drying and then adding the kieselguhr into steeping liquor, filtering and drying so as to obtain a precursor; and 3, putting the precursor into the muffle furnace to calcinate at a high temperature so as to obtain a kieselguhr loading solid superacid type Fenton catalyst. The prepared loading catalyst has high catalytic efficiency and low pH requirements and can be widely applied to organic wastewater treatment.

The invention discloses a preparation method of polypyrrole-coated lithium iron phosphate. The preparation method comprises the following steps: dissolving iron(III) p-toluenesulfonate hexahydrate in alcohol; ultrasonically dispersing lithium iron phosphate powder in the alcohol; placing into a sealed container; adding pyrrole monomers under low-temperature stirring condition; stirring for a period of time, so that the pyrrole monomers generate polymerization reaction on the surface of lithium iron phosphate; filtering; washing; drying; grinding; and sieving to obtain polypyrrole-coated lithium iron phosphate. The polypyrrole-coated lithium iron phosphate prepared by the method can be assembled with lithium tabs to form a test battery, which has an reversible capacity of 115 mAh/g during charge/discharge at 20C rate and an initial specific capacity of 155 mAh/g during charge/discharge cycle at 55 DEG C and 5C rate and can keep the specific capacity at 90% the initial value after 300 cycles. Accordingly, the test battery exhibits excellent high-rate charge/discharge capability and good high-temperature cycle stability. The method is simple and feasible, and suits large-scale industrial production.

The invention relates to a micro and nano alpha-Fe2O3 material and a preparation method thereof. The micro and nano alpha-Fe2O3 material has a cylindrical one-dimensional superstructure. The preparation method comprises the steps of dissolving iron salt, mixing the dissolved iron salt with polyol, putting a mixture in a reaction kettle, reacting for 2-60 hours at the temperature of 120-180 DEG C, cooling to room temperature, cleanly washing a product by using water and ethanol, and carrying out vacuum drying on the product until the weight is constant, thereby obtaining the final micro and nano alpha-Fe2O3 material. According to the micro and nano alpha-Fe2O3 material and the preparation method thereof, the morphology of the micro and nano alpha-Fe2O3 material is controlled through the volume ratio of the soluble iron salt, water and the polyol, so that the cylindrical self-assembled one-dimensional superstructure of uniform size is obtained, and a gas sensitive element can be made from the micro and nano alpha-Fe2O3 material and is used for detecting toxic gases; the preparation method has the characteristic of mild reaction conditions, and the prepared micro and nano alpha-Fe2O3 material with the one-dimensional superstructure has the characteristics of uniform morphology and controllable size.

An injecta for supplying multiple microelement to human body contains Cr, Cu, Fe, Mn, Mo, Se, Zn, I, F, sorbitol, hydrochloric acid and the water for injection. It is prepared through dissolving sorbitol in said water, adding hydrochloric acid to said water and dissolving iron chloride in it, respectively dissolving zinc chloride, manganese chloride, copper chloride, sodium selenite, sodium molybdate and potassium iodide in said water and adding them to said sorbitol solution, mixing with the solution of hydrochloric acid, respectively dissolving chromium chloride and sodium fluoride in said water and slowly adding them to resultant mixture, and regulating.

Oilfield completion, drilling and workover fluids containing iron are treated to remove the iron by passing them through a cavitation device together with an oxidizing agent. The cavitation device intimately mixes the oxidizing agent with the fluid while increasing the temperature of the fluid, thus promoting the oxidation reaction. Ferric hydrate and other solids or colloidal iron are removed in a filter capable of removing particles as small as 0.5 micron. The system may be enhanced by the addition of a bed of activated carbon capable of catalyzing the oxidation reaction.

A method of preparing a dispersion of stabilized iron oxide nanoparticles that comprise cores and coatings on the cores, which comprise zwitterionic functional groups chemically bound to the cores, using a single solution that comprises dissolved iron ions and a zwitterion silane and/or a hydrolyzed product of the zwitterion silane.

The invention discloses a preparation method of a nano Ni/Fe-biochar composite material and application of the nano Ni/Fe-biochar composite material in in-situ restoration of polybrominated diphenyl ether polluted soil. The preparation method comprises the following steps: dissolving iron salt or ferrous salt and polyvinylpyrrolidone in an ethanol water solution, uniformly mixing, adding biochar particles, and uniformly mixing to obtain a solution A; adding a reducer-containing ethanol water solution into the solution A, stirring to react completely, separating out the reaction product, washing, and adding into an ethanol water solution to obtain a solution B; and dropwisely adding a nickel-salt-containing ethanol water solution into the solution B, stirring to react completely, separating out the product material, washing, and drying to obtain the nano Ni/Fe-biochar composite material. The nano Ni/Fe bimetal particles are carried on the biochar, thereby further enhancing the flowability of the nanoparticles. The nano Ni/Fe-biochar composite material is beneficial to soil in-situ restoration due to the stability and dispersity. The nano Ni/Fe-biochar composite material can be used for restoring high-concentration PBDEs polluted soil, and has high restoration efficiency.

The invention discloses a preparation method of iron disulfide microspheres. Specifically, the method comprises the steps of: dissolving iron chloride, or iron chloride and urea in a mixed solution consisting of ethylene glycol and N,N-dimethylformamide, thus obtaining a clear homogeneous solution containing iron ions; adding sulfur powder; subjecting the mixed solution to a reaction for 10-20h at a temperature of 150-170DEG C, conducting separation with a conventional method, thus obtaining black powder, i.e. pyrite-type monodispersed iron disulfide microspheres. Products obtained with the method of the invention have uniform particle size and appearance, good technological repeatability and stable quality. Thus, the method provided in the invention is expected to be applied in the fields of solar energy conversion, heavy metal ion fixation, etc.

The invention discloses a method of removing chromium (VI) and dye pollutants by using plant polyphenol substances for in-situ synthesizing an iron-based material. The method comprises the steps of: 1) performing water-extraction to plant tissue to obtain plant tissue extract liquid, and dissolving iron salt in deionized water to produce an iron salt solution; 2) adding the iron salt solution to the wastewater comprising the Cr (VI) and dyes with uniform mixing, and allowing the liquid to stand for 5-30 min; 3) adding the plant tissue extract liquid with uniform mixing and allowing the liquid to stand for a reaction for 2-48 h. In the method, the iron salt, which is abundant in environment, is used as a precursor; and plant extract liquid (such as green tea) is used as a chelating agent and a reducing agent for iron ions. By adding the raw materials to a polluted field or a pollutant treatment reactor system, the iron-based material, which has stable reducing property, is produced in situ, so that the target pollutants are high-effectively degraded. The method achieves recovery in situ, is green and pollution-free, has high activity and good cyclic property, is high in effect and is economical, is easy to control and has wide available range. The method also can be used in recovery of chromium.

The invention discloses a method for preparing magnetic iron oxide nano particles. The method comprises the following steps of: dissolving iron pentacarbonyl and a modifier into a solvent, atomizing by virtue of an ultrasonic atomizer, loading a solution into a heater by virtue of a carrier gas, carrying out gasification, decomposition and oxidation, introducing products into collected fluid, mixing, stirring, and carry outing surface reaction to obtain modified magnetic iron oxide nano particles. The modifier used in atomized liquid and the collection fluid is selected from oleic acid or oleic amine, triethylene glycol, polyethylene glycol PEG and derivates thereof, glucosan, citric acid, tetramethylammonium hydroxide, carboxylic acid polyethylene glycol and derivates thereof, polyvinylpyrrolidone (PVP) and dimercapto succinic acid or a mixture of the substances; the carrier gas is a mixed gas of oxygen gas and argon gas, and the heating process is carried out in two stages. By applying the method disclosed by the invention, the magnetic iron oxide nano particles with uniform particle sizes can be prepared while the advantages of speediness, high efficiency, continuous production and low pollution are achieved; and the prepared iron oxide nano particles can be used in the fields such as biology, medicine, catalysis and mechanical lubrication.

The invention relates to a preparation method of a Cu2O/NiFe2O4 magnetic composite, belonging to the technical field of preparation of magnetic composite material. The method of the invention is characterized by comprising the following steps: dissolving iron salt and nickel salt in distilled water according to a certain ratio, then adding surfactant polyvinylpyrrolidone, adjusting the pH value of the solution to 9-11 with sodium hydroxide, then pouring the reaction solution in a high-pressure reaction tank and placing in a muffle furnace to keep temperature for 8-10 hours at 200-250 DEG C for fully reacting; washing the product, performing suction filtration and vacuum drying to obtain magnetic nickel ferrite power for standby; then dissolving copper salt and glucose in distilled water with a certain volume, adding the prepared nickel ferrite power in the obtained solution; stirring evenly, adding defined amounts of NaOH solution and hydrazine hydrate solution, continuously stirring to fully react; and then washing, performing suction filtration and vacuum drying, and finally obtaining the Cu2O/NiFe2O4 magnetic composite power.