133 results about "Ferroporphyrin" patented technology

The invention discloses a preparation method of a polymeric cyanamide low-toxicity gold leaching agent, and belongs to the field of hydrometallurgy. The preparation method comprises the following steps: uniformly mixing urea, sodium carbonate and ferrous chloride and finely grinding; then putting the fine grinding material into a high-temperature heating container, gradually raising the temperature, and preserving the heat; gradually cooling the reaction product to room temperature along with the furnace; and finally, a reaction product is crushed and ground into powder, and the polymeric cyanamide low-toxicity gold leaching agent is obtained. The synthetic raw materials of the gold leaching agent are simple, cheap and easy to obtain, the synthetic process is simple and easy to regulate and control, and the synthetic cost is low. The gold leaching agent obtained through the method is low in toxicity, the gold leaching speed is high, the gold leaching rate is high, and leaching tailings are common solid waste and are easier to treat.

The invention discloses a ferroptosis inhibitor and application of the ferroptosis inhibitor in radiation pneumonitis drugs, and relates to the technical field of biological medicines. The specific preparation method comprises the following steps: adding the ferroptosis inhibitor and the auxiliary agent into the solvent, and dissolving to obtain the ferroptosis inhibitor composition; wherein the ferroptosis inhibitor is isoorientin; the auxiliary agent is a glucosamine derivative; the solvent is a serum-free DMEM culture medium. The ferroptosis inhibitor composition prepared by the method provided by the invention can effectively reduce the rise of active oxygen, ferrous ions and malondialdehyde levels of human pulmonary epithelial cells BEAS-2b and mouse pulmonary epithelial cells MLE-12 caused by irradiation, restore cell mitochondrial membrane potential enrichment and inhibit the expression of various inflammatory factors in irradiated cells; therefore, the process of radiation pneumonitis is remarkably improved, and a new medication strategy is provided for research on radiation pneumonitis drugs.

The invention relates to an iron-containing precursor and a preparation method and application thereof.The preparation method comprises the steps that a mixed metal salt solution is prepared, the mixed metal salt solution at least contains ferrous ions and a reducing agent, and the mass ratio of the ferrous ions to the reducing agent is 50: 1-100: 1; a complexing agent and water are mixed to serve as a base solution, a mixed metal salt solution, the complexing agent and a precipitator are added into the base solution, and a first-stage reaction, a second-stage reaction and a third-stage reaction are sequentially carried out; the volume percentages of the added complexing agent in the added mixed metal salt solution are X1, X2, X3 and X1lt respectively; x2lt; x1 / X3 is more than or equal to 0.65 and less than or equal to 0.75; and after the third-stage reaction is completed, preparing an iron-containing precursor. According to the method, a traditional batch method is optimized, the stability and repeatability of production batches are improved, and the prepared precursor is narrow in particle size distribution, uniform in morphology and high in sphericity degree.

The invention discloses a method for preparing a sodium-rich boundary-rich iron-based prussian blue analogue (FePBA) through one-step hydrothermal synthesis assisted by sodium thiosulfate. The method specifically comprises the following steps: preparing a solution A and a Na4Fe (I I) (CN) 6 solution; the molar ratio of ferrocyanide to Fe ions in the solution B is 3: 4. And preparing a solution B to react with ferrocyanide to form FePBA. Adding sodium citrate to form a sodium and citrate-rich environment, then adding ferric iron salt, and fully stirring to chelate the added Fe < 3 + > with the citrate; and adding sodium thiosulfate after the step. Preparing a PVP (Polyvinyl Pyrrolidone) solution to play roles in dispersing FePBA and reducing agglomeration, and taking the PVP solution as a solution C; slowly dropwise adding the solution A and the solution B into the solution C at a constant speed by using a rubber head dropper to finally obtain a precursor solution, carrying out hydrothermal reaction for 6 hours at 110 DEG C, carrying out suction filtration on the obtained precipitate, and drying to obtain a FePBA sample. According to the invention, the time required for synthesis is greatly shortened, and the traditional coprecipitation of more than 24 hours is improved into rapid hydrothermal reaction of 6 hours.

The invention belongs to the technical field of biological medicine, and particularly relates to an iron ion carrier and a preparation method and application thereof. The iron ion carrier disclosed by the invention has the advantages that the iron ion carrier disclosed by the invention can have relatively good binding activity with iron ions and ferrous ions, and has relatively low cytotoxicity and relatively long in-vivo drug half-life period.

The invention discloses a method for producing mRNA (messenger ribonucleic acid) template plasmids by fermenting escherichia coli. When the recombinant escherichia coli is fermented and cultured, a seed solution of the recombinant escherichia coli is inoculated into a basic culture medium to be fermented and cultured until the OD600 value of fermentation liquor is 18-22, then a fed-batch culture medium is continuously added at the feeding rate of 5-15 mL / L / h to be subjected to continuous fed-batch fermentation culture, the basic culture medium contains 0.05-0.2 mmoL / L of ferric salt compound and 0.05-0.2 mmoL / L of copper chloride dihydrate, and the basic culture medium contains 0.05-0.2 mmoL / L of ferric salt compound and 0.05-0.2 mmoL / L of copper chloride dihydrate. The basal culture medium contains 10-15 g / L of copper chloride dihydrate and 100-300 mg / L of p-hydroxybenzoic acid, the carbon source of the basal culture medium contains 0.1-0.3 mmoL / L of a ferric salt compound, 0.1-0.3 mmoL / L of copper chloride dihydrate and 100-300 mg / L of p-hydroxybenzoic acid, the carbon source of the fed-batch culture medium contains 360-480 g / L of glycerol, and the ferric salt compound is one or more of ferrous citrate, ferric ammonium citrate or ferrous sulfate heptahydrate. According to the method, the yield and superhelix content of the mRNA template plasmids are improved by optimizing the culture medium formula and culture conditions, and large-scale production of the high-quality target mRNA template plasmids is facilitated.

The invention discloses a ferrous glycinate and EDTA ferric sodium compound product and a preparation method thereof. The compound product comprises a core material and a double-layer wall material, the core material is prepared from ferrous glycinate and EDTA (Ethylene Diamine Tetraacetic Acid) ferric sodium; the inner-layer wall material is cyclodextrin and Arabic gum; the outer-layer wall material is pectin and hydroxypropyl methyl cellulose; in the compound product, the mass percentage content of the ferrous glycinate is 20%-25%; the mass percentage content of the EDTA ferric sodium is 8%-10%; the mass percentage content of the inner-layer wall material is 60%-70%; and the mass percentage of the outer layer wall material is 2-5%. The EDTA ferric sodium and the ferrous glycinate are compounded to serve as the core material, and the double-layer embedding wall material is adopted, so that the iron fishy smell of the ferrous glycinate can be effectively covered on the basis of relatively high iron absorption and utilization rate, and relatively good stability can be achieved when the iron-iron composite material is applied to a liquid preparation product.

The invention discloses a doped iron-based MOFs nano-enzyme and application thereof in detection of ascorbic acid, and relates to the technical field of biomolecule detection. Ferrous chloride, cobalt chloride and dimethylimidazole are adopted as raw materials, the doped iron-based MOFs nano-enzyme is prepared through a hydrothermal reaction, and the doped iron-based MOFs nano-enzyme can be used for constructing a colorimetric detection platform for detecting ascorbic acid. The conductivity of the material is enhanced by introducing cobalt, and the electron transfer efficiency is improved, so that the catalytic activity is improved. The combination of iron and cobalt can promote the interaction between metals, and the synergistic effect can reduce the migration and loss of metal ions, thereby enhancing the catalytic activity and structural stability of the nano-enzyme. When the doped iron-based MOFs nano-enzyme prepared by the invention is used for detecting ascorbic acid, the detection limit of the doped iron-based MOFs nano-enzyme is 0.5671 [mu] M.

The use of a divalent metal lactate in products for promoting tissue regeneration, growth, healing and damage repair, belonging to the technical field of biological medicines. Preferably, the divalent metal lactate comprises one or a combination of calcium lactate, magnesium lactate, zinc lactate and ferrous lactate. Provided is a new manner of treatment for tissue damage and repair, and prevention and treatment of tissue fibrosis and / or scar tissue generation, said manner of treatment having wide prospects of application in terms of damage treatment and repair of tissue such as skin, connective tissue, tendons and fascia.

The invention belongs to the technical field of adsorbents, and discloses a core-shell structure composite material as well as a preparation method and application thereof. Ferroferric oxide is loaded on biochar by coprecipitation of ferric salt, ferrous salt and biochar, amination modification is performed by using polyethyleneimine, and a COF shell layer is prepared in situ by using a magnetic core. The shell layer is chemically connected with the magnetic core, and is coated by the COF shell, so that the structural stability is improved, the porous structure of the biochar is not easy to collapse, and the magnetic particles are not easy to fall off; the shell contains sulfonic acid groups, has electronegativity, and is combined with metal ions through electrostatic interaction, so that the adsorption sites of the adsorbent are increased. Meanwhile, the COF shell is of a porous structure, the specific surface area is large, the COF shell has the adsorption effect on metal ions, more adsorption sites are provided for the metal ions through the multiple adsorption effects of the COF shell and the magnetic core, and the removal rate is effectively increased.

The invention belongs to the technical field of biological medicines, and particularly relates to application of divalent metal lactate in a product for promoting tissue regeneration, growth, healing and damage repair. Preferably, the divalent metal lactate comprises one or a combination of more of calcium lactate, magnesium lactate, zinc lactate and ferrous lactate. The invention provides a new treatment mode for tissue injury and repair, and prevention and treatment of tissue fibrosis and / or scar tissue generation, and has wide application prospects in the aspects of injury treatment and repair of tissues such as skin, connective tissues, tendons, fascia and the like.

The invention discloses a ferroptosis-inducing targeted mPDA / MSNs nano-drug delivery carrier as well as a preparation method and application thereof, and relates to the technical field of preparation of targeted nano-delivery carriers. The preparation method comprises the following steps: firstly, connecting and modifying-NH2 to the surfaces of MSNs to obtain amino modified MSNs-NH2; the preparation method comprises the following steps: coating with mPDA to obtain mPDA / MSNs-NH2, and reacting with ferrous lactate to obtain Fe < 2 + >-mPDA / MSNs-NH2; the final carrier RGD-Fe2 +-mPDA / MSNs-NH2 is prepared by coupling an RGD targeting peptide, the particle size is uniform, the physicochemical property is stable, the ATRA and DOX encapsulation efficiency and the drug loading capacity are high, the drug can be responsively released in a simulated tumor microenvironment, a drug-loaded sample RFP / MN atD / A can deliver a drug into tumor cells in a targeting manner, ferroptosis can be rapidly induced, and the tumor cells can be effectively killed through synergistic chemotherapy.

The invention discloses a method for degrading acetaminophen in a water body by activating persulfate with iron-doped carbon quantum dots. According to the method, the acetaminophen-containing water body is degraded by activating the persulfate with the iron-doped carbon quantum dots. Wherein the iron-doped carbon quantum dots are prepared by taking ferrous gluconate as a raw material, carrying out hydrothermal reaction at 180-220 DEG C and dialyzing. According to the method disclosed by the invention, the persulfate can be effectively activated by using light energy in an activation process dominated by a photo-generated hole to generate more free radicals and non-free radical species, namely an efficient mixed oxidation system of a free radical pathway dominated by hydroxyl free radicals and a non-free radical pathway dominated by singlet oxygen is formed; the method has the advantages of being simple in process, convenient to operate, low in cost, extremely low in catalyst addition amount, low in oxidant addition amount, high in utilization rate, high in degradation efficiency, good in removal effect, environmentally friendly and the like.

The invention belongs to the field of medicinal chemistry, and discloses a ferrous succinate tetrahydrate crystal form, and in an X-ray diffraction pattern, the ferrous succinate tetrahydrate crystal form has characteristic peaks at 2 theta angles of 7.34 degrees, 12.0 degrees, 15.05 degrees, 16.53 degrees, 19.27 degrees, 21.25 degrees, 23.82 degrees, 30.58 degrees, 36.07 degrees, 37.05 degrees and 38.15 degrees. The ferrous succinate tetrahydrate crystal form is high in ferrous content, low in high iron content and good in stability. The invention also discloses a preparation method of the ferrous succinate tetrahydrate crystal form. The preparation method has the advantages of low cost, simplicity in operation, high yield, strong repeatability and the like. The invention also discloses a pharmaceutical composition, which comprises a therapeutically effective amount of ferrous succinate tetrahydrate and pharmaceutic adjuvants.

The embodiment of the specification provides a preparation method of amination modified magnetic beads, and the preparation method comprises the following steps: mixing ferric salt, a ferrous salt aqueous solution and a dextran aqueous solution for reaction to obtain dextran magnetic beads; then adding an epichlorohydrin solution into the glucan magnetic beads to react for a certain time, and then adding an amination reagent to react for a certain time to obtain amination modified magnetic beads; the embodiment of the invention also provides a magnetic bead for cell sorting and cell activation, and a target cell sorting and target cell activation method. The cell sorting magnetic bead provided by the invention is high in cell sorting purity, high in sorting recovery rate and high in cell viability; the activation magnetic bead provided by the invention has a good activation effect, and activated cells can be amplified at high times.

The invention belongs to the technical field of bioactive peptides, and discloses a white snakehead oligopeptide as well as a preparation method and application thereof. The white snakehead oligopeptide is selected from one of oligopeptides with amino acid sequences as shown in SEQ ID NO.1-8. The invention further discloses a preparation method of the white snakehead oligopeptide. The polypeptide provided by the invention has a relatively high ferrous / zinc absorption rate to a human body, has a certain function of treating iron-deficiency anemia and zinc deficiency, and has a good application prospect in mineral (iron / zinc) supplements, functional foods and health-care products.

The invention discloses a method for immobilization and magnetic separation of arsenic in water by biomineralization, which comprises the following steps: S1, preparation of a liquid culture medium: dissolving a 60% (volume) sodium lactate solution, sodium nitrate, potassium dihydrogen phosphate, magnesium sulfate heptahydrate and a yeast extract in deionized water in proportion, adjusting the pH value of the culture medium solution to 6.9-7.0, sub-packaging and performing high-pressure sterilization; s2, inoculating a bacteria solution into the sterilized culture medium for amplification culture; s3, preparing a standard arsenic solution; s4, preparing ferric citrate and ferrous chloride solutions; s5, performing MSR-1 biological control mineralization synthesis of magnetosome; 6, MSR-1 induces ferrous iron to precipitate and remove arsenic; and S7, magnetically separating a bacterium-iron-arsenic mixture. The method realizes fixation and separation of As in water, not only retains the advantages of low cost and environmental friendliness of biomineralization polluted water remediation, but also overcomes the defects of low remediation efficiency and potential pollution caused by incapability of recycling.

The invention provides a preparation method and application of oversized metal ferrocyanide, and relates to the technical field of nonferrous metallurgy. Comprising the following steps: preparing a DMF aqueous solution, and dividing the DMF aqueous solution into two equal parts which are respectively marked as a solution A and a solution B; soluble metal salt is added into the solution A, and the pH value is controlled to be 3-8; ferrocyanide is added into the solution B, and the pH value is controlled to be 3-8; dropwise adding the solution B into the solution A, and reacting to obtain a solution C; and filtering and drying the solution C obtained in the step 4 to obtain the metal ferrocyanide adsorbent. According to the method, N, N-dimethylformamide (DMF) is added as a surfactant in the process of preparing a metal ferrocyanide adsorbent by a conventional chemical precipitation method, and ferrocyanide is synthesized in one step. The oversized metal ferrocyanide adsorbent can be obtained by regulating and controlling the adding proportion of the ferrocyanide and water, and has a better adsorption effect.

The application discloses a method for synthesizing tervalent tetraaryl iron porphyrin from pyrrole, aromatic aldehyde and ferrous salt, which comprises the following steps: adding anhydrous aluminum chloride, aromatic aldehyde, pyrrole and ferrous salt into DMF under stirring, and then heating and refluxing the reaction mixture for 0.5 hours under nitrogen; removing the nitrogen and continuing to heat the reaction mixture for a certain time; stopping the reaction; cooling the reaction mixture; and placing the reaction mixture at 273K overnight; and finally filtering the reaction mixture to obtain the iron porphyrin.

The invention discloses a method for recovering a titanium dioxide byproduct ferrous sulfate. The method comprises the following steps: S1, dissolving a titanium dioxide byproduct ferrous sulfate in water, and filtering to obtain a first filtrate; s2, adjusting the pH value of the first filtrate to 4.5-5.5, and filtering to obtain a second filtrate; s3, adding sulfide into the second filtrate, and filtering after reaction to obtain third filtrate; s4, adding an alkaline liquid into the third filtrate, and filtering after reaction to obtain a fourth filtrate and a first filter cake, so as to obtain ferrous hydroxide with first purity; and S5, preparing ferrous oxalate dihydrate from the ferrous hydroxide with the first purity. According to the method, through the synergistic effect of accurate pH value control, sulfide impurity removal and fractional precipitation, efficient separation of iron and manganese is achieved, the complex impurity removal process of multiple oxidation reduction is avoided, the operation process is simple, ferrous oxalate dihydrate is prepared after high-purity ferrous hydroxide is prepared, and the impurity removal cost is low.

The application relates to the technical field of sialic acid application, in particular to application of sialic acid in promoting iron absorption of iron supplement agents. It is found for the first time that sialic acid with a daily intake of 0.8-3.5 mg / kg and ferrous iron with a daily intake of 0.2-0.5 mg / kg can promote the absorption of ferrous iron by human bodies. More specifically, the application claims an iron supplement agent containing ferrous iron drugs and sialic acid. The iron supplement agent provided by the application promotes iron supplement by compounding sialic acid and ferrous iron drugs, thereby improving the bioavailability of iron, regulating immunity, promoting intestinal health and achieving various biological activities while supplementing iron.

The invention relates to the field of food additives and pharmaceutical preparations, and discloses a preparation method and application of high-stability ferrous glycinate. Glycine and ferrite are sequentially subjected to pretreatment, anhydrous solvent system construction, primary-secondary gradient coordination, antioxidant directional integration, low-temperature programmed crystallization and surface hydrophobization treatment. Wherein the natural antioxidant is subjected to nano coating by adopting a supercritical CO2 deposition technology, so that the controllable release of the antioxidant activity is realized; the coordination kinetics is optimized through ultrasonic intervention, and the Fe-S bond bonding strength is enhanced; and a multi-stage protective barrier is formed by combining fumed silica surface treatment and an oxygen barrier packaging process. The problems that a traditional iron agent is prone to oxidation inactivation and moisture absorption caking and low in bioavailability are effectively solved, and the chemical stability and physical integrity of a product in a complex environment are remarkably improved.

There is provided a method for producing ferrous sulphate and phosphoric acid comprising treating ferrous phosphate with sulphuric acid for obtaining ferrous sulphate and phosphoric acid. Additionally, there is provided a use of sulphuric acid for treating ferrous phosphate for obtaining ferrous sulphate and phosphoric acid.

In an iron (II) citrate monohydrate, identified by the formula FeC6H6O7-H2O ( Ferrous citrate monohydrate or iron citrate (II) monohydrate), obtained according to a particular production method, citric acid and elemental iron are bound in a molecular complex where the iron is agglomerated in the citrate which moves to a cyclic form and the iron is bound to the O groups of the carboxylic groups 1 and 3 through ionic bonds, forming two enantiomers, D and L (R and S), both perfectly water-soluble and highly assimilable by the human body. Formula (L) & Formula (D). With a different absorption mechanism from traditional iron molecules, said iron citrate monohydrate is usable in pharmaceutical and / or nutraceutical and / or food compositions, in particular in the treatment and prevention of iron deficiency anemias and in general of all diseases and disorders associated with iron deficiency. The effectiveness is proven by several examples.

The present invention relates to a bimetallic FeNi-MOF oxygen evolution electrocatalyst and a preparation method thereof. The technical scheme is: according to the molar ratio of ferrous ion: nickel ion of 1: (0.25-4), ferrous salt and nickel salt are mixed to obtain mixture A; according to the concentration of 0.017-0.019 mol / L, mixture A is dissolved in a mixture of deionized water and ethylenediamine, and ultrasonic dispersion is performed under sealed conditions to obtain solution A. According to the molar ratio of 1: 1, tetrahydroxy-1,4-benzoquinone and mixture A are mixed to obtain mixture B; according to the concentration of 0.017-0.019 mol / L, mixture B is dissolved in deionized water, and ultrasonic dispersion is performed under sealed conditions to obtain solution B. According to the volume ratio of solution B: solution A of 1: (0.95-1.05), the ingredients are prepared, mixed, ultrasonic dispersion is performed under sealed conditions, 75-85°C is kept warm for 10-12h, solid-liquid separation is performed, and drying is performed to obtain a bimetallic FeNi-MOF oxygen evolution electrocatalyst. The invention has simple process and low cost, and the prepared product has excellent catalytic performance.

The invention provides a method for removing nano plastics in water based on an in-situ oxidation coagulation process, which comprises the following steps: preparing a ferrous coagulant: adding alkali liquor into a ferrous solution to obtain the ferrous coagulant; preparing an oxidant solution and activating the oxidant solution; in-situ oxidation coagulation: under a stirring condition, simultaneously adding the activated oxidant solution and a ferrous coagulant into the to-be-treated water body containing the nano plastic, controlling the feeding ratio of the ferrous coagulant to the oxidant solution so that the mass concentration ratio of Fe to the oxidant is in a range of 1: 0.05 to 1: 0.3, and carrying out in-situ oxidation coagulation; according to the method, the ferrous coagulant is added into the nano plastic particles, so that ferrous ions in the ferrous coagulant are converted into iron ions, and the iron ions are adsorbed on the surfaces of the nano plastic particles and are rearranged and crystallized to form flocculate with a sheet-shaped or flower-shaped flexible nanosheet structure, so that the nano plastic monomer particles are wrapped and efficiently removed.

The present invention provides a preparation method and application of an antibacterial coating on a titanium surface, belonging to the technical field of metal surface treatment. The preparation method includes: pickling the surface of a titanium material to obtain a pickled titanium material; alkalizing the pickled titanium material in an alkaline solution to form a sodium titanate layer and obtain an alkalized titanium material; vertically placing the alkalized titanium material in a reaction solution containing an iron source and a sulfur source for a hydrothermal reaction to obtain a titanium material with an FeS2 coating; wherein, the iron source in the reaction solution includes any one of ferric chloride, ferrous gluconate, ferrous sulfate, and ferric nitrate, and the sulfur source includes any one of tetraethylthiuram disulfide, thiourea, and thioacetamide. This method prepares a dense-structured FeS2 coating with good bonding force to the pure titanium substrate on the surface of pure titanium by using the vertical solvothermal method, which can improve the antibacterial performance of the pure titanium material and further enhance the biocompatibility of the medical pure titanium material.

The invention relates to the field of compound preparation, and discloses a method for preparing alkali metal ferrocyanide by using iron powder as an iron source through a mechanochemical method, and the method comprises the following steps: mixing the iron powder with a solution containing alkali metal cyanide to obtain a mixture, and enabling the water content of the mixture to be not more than 50wt%, the alkali metal cyanide comprises sodium cyanide or potassium cyanide, the reaction time is short, the reaction temperature is low, the process of treating the raw materials in advance is omitted, hydrolysis of the sodium cyanide is reduced, side reactions are reduced, a small amount of NH3 is released in the complexing reaction process, and the method is suitable for industrial production. The yield is high, sulfate containing ferrocyanide is not produced as a byproduct, and unreacted metal residues are recycled. Compared with a traditional method, the method disclosed by the invention is low in production cost and high in added value of products, and has a relatively good industrial prospect.

The utility model discloses a pneumatic stirring device for preparing ferrous chloride, and relates to the technical field of ferrous chloride preparation. The device comprises a tank body, the top of the tank body is fixedly provided with a top cover through bolts, the bottom of the tank body is fixedly connected with an inclined filter pipe, one side of the filter pipe is fixedly communicated with a horizontal discharge pipe, the bottom of the filter pipe is open and is in threaded connection with a bottom cover, and the top of the bottom cover is fixedly connected with a supporting column. A filter cylinder is fixedly connected to the top of the supporting column, a gap is formed between the filter cylinder and the inner wall of the filter pipe, and a limiting ring is fixedly connected to the top of the filter cylinder and makes contact with the inner wall of the filter pipe. According to the utility model, the filter cartridge is taken down by taking down the bottom cover, so that iron powder which is not completely reacted can be conveniently recycled and reused, and meanwhile, during discharging, the stirring shaft drives the movable shaft to rotate, and the movable shaft stirs in the filter cartridge, so that the filter cartridge is prevented from being blocked, and the discharging efficiency is improved.

A method for preparing magnetic amino-functionalized biochar and its application are disclosed, relating to the field of biochar preparation technology. The method involves dissolving ferrous chloride dihydrate, ferric chloride dihydrate, and ammonia in deoxygenated water, stirring until homogeneous, then adding amino-functionalized biochar. After thorough stirring, the product is collected by magnetic adsorption and finally washed to obtain magnetic amino-functionalized biochar. The magnetic amino-functionalized biochar is used for removing chromium from water. This invention provides a method for preparing magnetic amino-functionalized biochar and its application.