58 results about "Ferric citrate" patented technology

The invention discloses a method for promoting biomass accumulation of haematococcus pluvialis, which comprises the following steps: adding salicylic acid, melatonin and alpha-ketoglutaric acid into a basic culture medium, and replacing ferric trichloride with ferric citrate as an iron source to obtain an improved BG-11 culture medium; the method comprises the following steps: inoculating a haematococcus pluvialis seed solution into a culture bottle containing an improved culture medium, carrying out illumination treatment on the first day to the second day by adopting pulsed red light with the wavelength of 620 nm in the early stage of a green stage, carrying out illumination treatment on the third day to the fifth day by adopting red light with the wavelength of 660 nm in the middle stage of the green stage, and carrying out illumination treatment on the sixth day to the seventh day by adopting pulsed red light with the wavelength of 680 nm in the later stage of the green stage. Through a synergistic scheme of the improved BG-11 culture medium, staged red light treatment and dynamic environment regulation and control, the problems of low light energy utilization rate and insufficient stress resistance in the existing haematococcus pluvialis culture process are solved, high efficiency and stability of haematococcus pluvialis biomass accumulation are realized, the biomass can reach 7.0 * 10 < 5 > cells / mL in the later period of the green stage, and the yield of the haematococcus pluvialis can reach 7.0 * 10 < 5 > cells / mL in the later period of the green stage. And the survival rate of haematococcus pluvialis cells reaches 95%.

This invention discloses a culture medium for manganese-oxidizing bacteria suitable for low-carbon source environments in water supply networks and its application. The culture medium is prepared by mixing ferric ammonium citrate, manganese sulfate, ammonium sulfate, sodium chloride, magnesium sulfate, dipotassium hydrogen phosphate, and sodium nitrate, followed by high-temperature and high-pressure sterilization to obtain a culture solution. Manganese sulfate is added to the culture solution to obtain the manganese-oxidizing bacteria culture medium. Manganese-oxidizing bacteria are screened using this culture medium. Cast iron pipe scale is subcultured in the medium to enrich the manganese-oxidizing bacteria culture solution. The enriched manganese-oxidizing bacteria culture solution is diluted and spread onto agar solid medium, and incubated at a constant temperature to obtain manganese-oxidizing bacteria colonies. This invention solves the problem of altered bacterial physiological metabolism caused by high concentrations of added manganese ions, effectively improving bacterial activity and manganese oxidation capacity.

The invention relates to a carbitol-containing anti-caking water-soluble fertilizer and a preparation method thereof, and belongs to the field of water-soluble fertilizer production, the carbitol-containing anti-caking water-soluble fertilizer comprises the following substances by weight: 0.15-0.2% of carbitol, 20-28% of diammonium hydrogen phosphate, 22-28% of ammonium nitrate, 40-50% of potassium sulfate, 3-5% of magnesium nitrate, and 2-4% of ferric citrate. According to the invention, carbitol is applied to anti-caking of the water-soluble fertilizer for the first time, and integration of anti-caking, stability improvement and function synergism is realized; by adding carbitol, caking of the water-soluble fertilizer can be effectively avoided, a green and efficient technical scheme is provided for improving the quality of the water-soluble fertilizer, and the storage and use cost is reduced.

The invention relates to the technical field of cell culture media, in particular to a sheep testis somatic cell culture medium and a culture method.The sheep testis somatic cell culture medium is prepared from, by weight, 10-15 parts of MEMS alpha, 4-7 parts of KSR, 2-4 parts of sodium chloride, 3-5 parts of recombinant human transferrin, 1-3 parts of ferric citrate, 2-4 parts of L-glutamine, 5-10 parts of water and 4-7 parts of hydroxyapatite. According to the cell culture medium, MEM and KSR are adopted as matrix raw materials, sodium chloride and other auxiliaries are added, the hydroxyapatite agent is matched, the performance change of the cell culture medium on the survival rate and the survival amount of testicular somatic cells is enhanced, meanwhile, hydroxyapatite serves as a matrix of the hydroxyapatite agent, the performance of the cell culture medium is improved through a specific modification solution, and the cell culture medium is prepared. And the function of hydroxyapatite blended kaolin in the system is optimized, so that the functional effect of the cell culture medium is enhanced, and the performance of the product is further improved.

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 invention discloses a nitrogen-phosphorus-boron-iron co-doped coconut shell activated carbon carrier and a preparation method and application thereof, the method comprises the following steps: S1, crushing coconut shell activated carbon, and carrying out Ar / water vapor activation treatment to obtain pretreated activated carbon; s2, after the chitosan solution and the urea solution are mixed, phytic acid is added, the pH is adjusted to 5.5-6.0, stirring is conducted, and a wetting agent is obtained; s3, adding a wetting agent into the pretreated activated carbon, heating, stirring, filtering, washing, and drying in vacuum to obtain pre-activated activated carbon containing nitrogen and phosphorus; and S4, dissolving ammonium ferric citrate and sodium citrate in deionized water, adding ethylene glycol, stirring, then adding the pre-activated activated carbon containing nitrogen and phosphorus, heating, stirring again, then dropwise adding a potassium borohydride mixed solution, and roasting to obtain the nitrogen, phosphorus, boron and iron co-doped coconut shell activated carbon carrier. After the nitrogen-phosphorus-boron-iron co-doped coconut shell activated carbon carrier provided by the invention is loaded with the metal catalyst, the common problems of low conversion rate and poor selectivity in nitro hydrogenation reaction can be solved.

This invention provides high-purity ferric citrate that is substantially free of β-iron hydroxide. [Solution] A high-purity ferric citrate that substantially does not contain β-iron hydroxide, and in which the β-iron hydroxide content is less than 6% by weight relative to its total weight. Preferably, high-purity ferric citrate having a β-iron hydroxide content of less than 2.5% by weight. More preferably, high-purity citric acid II having a β-iron oxide content of less than 1.0% by weight. iron.

The invention provides a solid-state luminous magnetic carbon dot fluorescent material as well as a preparation method and application thereof. Ammonium ferric citrate is taken as an iron source, basic fuchsin is taken as a carbon source, polyethyleneimine is taken as a cross-linking agent, and magnetic Fe3O4 is formed through reaction of polyethyleneimine and ammonium ferric citrate; magnetic Fe3O4 and carbon dots formed by a carbon source are connected through dehydration condensation of amino of polyethyleneimine and carboxyl on the surface of basic fuchsin, the solid-state light-emitting magnetic carbon dot fluorescent material in which the carbon dots and the magnetic Fe3O4 are dispersed and are not in contact is obtained, AIQ does not occur in the aggregate, solid-state light emitting of the magnetic carbon dot fluorescent material can be achieved, and the magnetic carbon dot fluorescent material has good application prospects. The magnetic carbon dot fluorescent material can be applied to fingerprint extraction.

The application discloses a preparation method of cigar tobacco deep color jacket based on oxygen-increasing fermentation, and relates to the technical field of cigar production and processing. The method is characterized by the following steps: soaking the dried cigar tobacco in a mixed solution of ferric citrate and xylo-oligosaccharide, naturally air-drying, controlling the water content of the cigar tobacco raw material, and then performing fermentation treatment to obtain the finished product of the cigar tobacco deep color jacket. The method can effectively deepen the color of the cigar tobacco, meet the quality requirements of the jacket, and obviously improve the aroma quality and aroma amount of the jacket. When the oxygen concentration in the fermentation environment is controlled to be about 29% at the same time, the above-mentioned effects are more obvious, and the economic value of the cigar jacket product is significantly improved.

The invention relates to the technical field of agricultural environment restoration and plant nutrition regulation and control, in particular to a passivation culture solution for rice cadmium reduction and a preparation method of the passivation culture solution. The culture solution is composed of a ferric citrate complexing solution, a sodium polyaspartate graft, potassium dihydrogen phosphate, a choline-stabilized orthosilicic acid mother solution and a zinc ethylenediamine tetraacetate disodium salt hydrate. In the preparation process, a stable system is cooperatively constructed through multi-coordination complexing, electrostatic regulation and an organic framework stabilization mechanism. The culture solution still keeps good dispersity and stability under acidic and hard water conditions, can form a weak-acid-to-neutral buffer area in rice rhizosphere, effectively reduces migration and absorption of cadmium ions, maintains availability of nutrient elements such as iron and zinc, remarkably reduces the cadmium content of rice grains, improves the nutritional quality and environmental adaptability of crops, and has a wide application prospect. The method is suitable for efficient and safe treatment of cadmium-polluted rice fields.

In the ferric iron citrate monohydrate defined by the chemical formula FeC6H6O7 H2O (ferrous citrate monohydrate or ferric iron citrate monohydrate) obtained according to a specific production method, the citric acid and the elemental iron are combined in a molecular complex in which the iron is gathered in the citrate moving into a ring-like form and the iron is bound to the O groups of the carboxyls 1 and 3 through ionic bonds, forming two enantiomers D and L (R and S), both of which are completely water-soluble and highly absorbable by the human body. Formula (L) and Formula (D). With a different absorption mechanism than traditional iron molecules, said ferric iron citrate monohydrate can be used in pharmaceutical compositions and / or nutritional compositions and / or food compositions, in particular for the treatment and prevention of iron deficiency anemia and all diseases and conditions associated with iron deficiency. The effectiveness is demonstrated through several examples.

The invention provides a preparation method and application of ammonium ferric citrate. The preparation method of the ferric ammonium citrate comprises the following steps: carrying out a first reaction on an iron compound and first ammonia water, introducing air in the process of the first reaction, and preparing a first slurry, and carrying out solid-liquid separation on the first slurry, taking a solid, carrying out second reaction on the solid, second ammonia water and citric acid in a solvent, and concentrating to prepare the ferric ammonium citrate. According to the preparation process of the ferric ammonium citrate, the generation of hydrogen and the use of a strong oxidant in the traditional process are avoided, the safety of the production process is improved, the ferric ammonium citrate with few impurities and high purity is obtained, qualified diammonium hydrogen phosphate is co-produced, and the preparation process has a great application prospect.

The invention discloses a method for treating pollutants by directionally activating persulfate through a single-Fe-site carbon-based material, and belongs to the technical field of wastewater treatment. The preparation method comprises the following steps: treating shell powder by using an acid solution, then successively mixing with dicyandiamide, potassium salt and ferric citrate, and then carrying out annealing treatment to obtain the single-Fe-site carbon-based material. Monatomic Fe species are anchored on the surface of the nitrogen-doped carbon nano tube to form an Fe-N4 local coordination structure with a bent interface, peroxymonosulfate is activated by using a single Fe site carbon-based material to generate an adsorption state * OOOH active species, high specificity is achieved, the catalytic effect on wastewater is remarkable, reproducibility is high, a catalytic system is stable, large-scale popularization is facilitated, and the method is suitable for industrial production. Wide application prospects are realized.

A method of preparing a FeMnCeOx biomaterial is provided, including the following steps. A Pseudomonas sp. strain KW-2 is obtained. A culture medium with a pH of 6.5-7.8 is prepared, which includes 0.1 g / L K2HPO4, 0.2 g / L MnSO4·7H2O, 0.2 g / L NaNO3, 0.1 g / L CaCl2), 0.1 g / L NH4Cl, 0.1 g / L (NH4)2CO3, 35 g / L NaCl and 150 mg / L ferric ammonium citrate. The culture medium is autoclaved, inoculated with the KW-2 strain, cultured for 1-3 days, added with a cerium nitrate solution, cultured for 3-7 days and centrifuged at 4,000-8,000 rpm for 10-20 min to collect a precipitate. The precipitate is rinsed 5-8 times with deionized water and 0.01 mol / L phosphate buffered saline (PBS) and freeze-dried at −60° C. to obtain the FeMnCeOx biomaterial. A method for treating antibiotic wastewater using the FeMnCeOx biomaterial is also provided.

The invention discloses a method for in-situ CO2 conversion and activation of Fe-K modified porous activated carbon and application of the Fe-K modified porous activated carbon. The method comprises the following steps: (1) dipping and drying: adding ferric citrate, potassium carbonate and a carbon material into water, fully dissolving and dispersing, heating at 50-90 DEG C to evaporate moisture to obtain a Fe-K loaded carbon material, and drying in a drying oven at 80-120 DEG C for later use; (2) high-temperature pyrolysis: carrying out high-temperature pyrolysis on the Fe-K loaded carbon material at 500-700 DEG C for 2-6 hours to obtain a Fe-K modified carbon material; and (3) blending pyrolysis: uniformly mixing the Fe-K modified carbon material and limestone in a mass ratio of (0.1-3): 1, carrying out high-temperature co-pyrolysis for 2-8 hours, and reacting at a constant temperature of 600-900 DEG C to obtain the Fe-K modified porous activated carbon. According to the method, carbon material activation and CO2 generated by limestone decomposition are linked, carbonate decomposition and charcoal activation are integrated, the carbon reaction activity is increased by introducing iron and potassium elements, in-situ reduction of CO2 generated in the carbonate decomposition process in the cement industry is achieved, and meanwhile the selectivity of in-situ CO2 conversion can be improved.

The invention discloses a simple and low-cost method for preparing nitrogen (iron)-doped three-dimensional porous graphene, which comprises the following steps: by taking typha angustifolia leaves as a carbon precursor and ferric ammonium citrate as a nitrogen source and a graphitization catalyst, carrying out microwave heating pore-forming, carbonization and graphitization to obtain the nitrogen (iron)-doped three-dimensional porous graphene. The nitrogen content, the iron content, the specific surface area and the graphite degree of the material can be controlled according to the use amount of the ammonium ferric citrate and the microwave time. The material is metal-free nitrogen-doped three-dimensional porous graphene after iron removal.

The invention relates to the technical field of microorganisms. The invention particularly discloses a culture medium and a preparation method and application thereof. Each liter of the culture medium comprises 3-8 g of L-asparagine, 0.3-1 g of buffer salt, 8-15 g of a carbon source, 50-100 mL of glycerin, 0.01-0.1 g of ferric ammonium citrate, 0.1-0.5 g of magnesium sulfate, 1-5 g of citric acid and the balance of water. Wherein the carbon source is selected from one or more of sodium pyruvate, glucose and glucose monohydrate; the buffer salt is selected from monopotassium phosphate and / or sodium dihydrogen phosphate. The culture medium is simple in component, wide in source and low in cost, and low-cost culture of mycobacteria can be achieved.

The application discloses a preparation method of a coal-saving agent for denitration type cement firing and application thereof. The method comprises the following steps: (1) mixing aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion, stirring uniformly, drying and grinding to obtain a precursor powder; (2) placing the precursor powder in saturated limewater and reacting under heating conditions, separating out solid matters after completion, drying the solid matters, mixing the dried solid matters with phosphating liquid, standing and drying to obtain a denitration heat-aiding agent; and (3) taking a penetrating agent, a bulking agent, iron citrate and the denitration heat-aiding agent as an A component, and taking hydrogen peroxide as a B component. The A component and the B component are mixed uniformly before use to obtain the coal-saving agent. The coal-saving agent can promote the combustion of coal powder, improve the utilization rate, help to reduce the emission of polluting gases such as sulfur oxides and nitrogen oxides, and relieve the high energy consumption and high pollution problems faced by cement production enterprises.

The invention discloses an ammonium ferric citrate carbon dot gold nano enzyme and application thereof in rapid detection of pendimethalin, and belongs to the technical field of chemical analysis and detection. The nano-enzyme is prepared from ammonium ferric citrate carbon dot reduced gold nanoparticles, and has both peroxidase activity and surface enhanced Raman activity. During detection, nano-enzyme and pendimethalin are incubated to cause aggregation, so that the color of a solution becomes light, the absorbance at 550nm of gold nanoparticles is reduced, the catalytic activity of the enzyme is inhibited, and a Raman signal of a substrate at 1605cm <-1 > is reduced. A colorimetric-Raman dual-mode detection method is established on the basis, large equipment is not needed, detection is completed within 15 minutes, the detection limit of a colorimetric method is 19.5 nmol / L, the detection limit of a Raman method is 1.88 nmol / L, the anti-interference performance is high, the method can be used for on-site rapid detection of pendimethalin in samples such as tobacco leaves, and the detection accuracy and reliability are remarkably improved.

The invention provides a cyaniding gold leaching auxiliary and a gold leaching method, and belongs to the technical field of cyaniding gold leaching, and the cyaniding gold leaching auxiliary is composed of the following components of, by mass, 40-45% of ferric ammonium citrate, 40-50% of potassium ferrocyanide and 5-20% of sodium bicarbonate. According to the cyaniding gold leaching auxiliary, efficient gold leaching is achieved through the synergistic effect of the sodium bicarbonate, the ammonium ferric citrate and the potassium ferrocyanide, wherein the sodium bicarbonate stabilizes the pH and improves mass transfer; ferric ammonium citrate is complexed with impurity ions, and oxidation circulation is accelerated; potassium ferrocyanide doubly inhibits pyrite to reduce cyanide consumption; the three components form a closed-loop synergistic system which has the advantages of high efficiency, economy and environmental protection. Through the synergistic effect of the cyaniding gold leaching auxiliary agent and sodium cyanide, gold can be more effectively extracted from ore, and the leaching efficiency is improved.

Methods of administering ferric citrate to reduce and / or control serum phosphorus levels, increase serum bicarbonate levels, improve one or more iron storage parameters (e.g., increase serum ferritin levels, increase transferrin saturation (TSAT), increase hemoglobin concentration), increase iron absorption, maintain iron stores, treat iron deficiency, treat anemia, reduce the need for IV iron, reduce the need for erythropoiesis-stimulating agents (ESAs), and / or reduce mortality and morbidity related to adverse cardiac events in chronic kidney disease patients, are disclosed.

The invention discloses a selective culture medium and method for screening or separating aeromonas, and relates to the technical field of microbial culture. The selective culture medium comprises a yeast extract, a nitrogen source, a carbon source, sodium citrate, sodium deoxycholate, sodium thiosulfate, ferric citrate, sodium chloride, agar, an acid-base indicator, ampicillin and diaminopteridine. The method can be used for rapidly and efficiently separating the aeromonas, and provides reliable preposition selection for detection or identification of the aeromonas.

This invention provides a biochar-based Fe single-atom catalyst, its preparation method, and its application. The preparation method includes the following steps: calcining shrimp shells under a nitrogen or inert gas atmosphere to obtain biochar, followed by acid washing, cleaning, and drying to obtain biochar SO; dissolving melamine and cyanuric acid in DMSO to obtain solution A and solution B; dissolving ferric citrate in solution A and then adding it to solution B; stirring and reacting; filtering, washing, and drying to obtain supramolecular polymer MCA; mixing the obtained SO and MCA at a mass ratio of 1:0.25~1, grinding, and then co-pyrolyzing at 450-750℃ for 1-5 hours under a nitrogen or inert gas atmosphere, followed by cooling. The technical solution of this invention exhibits high catalytic activity, can efficiently catalyze the rapid degradation of aniline by PMS, is low in cost, has minimal environmental impact, and is safe, showing great application potential in the treatment of aniline-related wastewater.

The invention belongs to the technical field of animal model establishment, and discloses an establishment method and application of a chronic oral ferric citrate induced Parkinson mouse model, C57BL / 6 mice are fed with mouse maintenance food (high-iron feed) added with 2.25% ferric citrate for 22 weeks, and then a 5% ferric citrate solution is used for intragastric administration for 4 weeks. Finally, behavioral evaluation is carried out through behavioral tests such as an open field test, a rotating rod test, a pole climbing test, a holding power test and a Y labyrinth test, and the tests such as the rotating rod test, the pole climbing test and the holding power test show that the PD model mouse has remarkable motor function impairment such as reduction of motor coordination, muscular tension and balance force; open field tests and Y maze show that learning and memory functions of mice are impaired, and cognitive impairments such as anxiety mood occur. Clinical chronic disease conditions of Parkinson's disease are simulated, and the chronic model is more suitable for monitoring early changes and screening early diagnosis indexes of Parkinson's disease; the method has the characteristics that the behavioral disorder can be quantified, and DA energy neuron degeneration loss characteristic lesion is realized.

The present invention relates to an ammonium ferric citrate-organic acid complex or a salt thereof and a preparation method therefor, further relates to a composition comprising the ammonium ferric citrate-organic acid complex or the salt thereof and the use of the complex as an animal feed additive and a food additive, and further relates to the use of the ammonium ferric citrate-organic acid complex or the salt thereof in the preparation of a drug for preventing and treating diarrhea in a farmed animal.

The invention belongs to the technical field of catalytic materials, and particularly relates to carbon nano tube packaged zero-valent iron as well as a preparation method and application thereof. The preparation method of the carbon nanotube packaged zero-valent iron comprises the following steps: S1, mixing citric acid, ferric salt and water, and adjusting the pH value of the solution to 3.8-4.2 to obtain an iron precursor solution; s2, a biomass raw material and the iron precursor solution are mixed for a complex reaction, sol-gel is formed and dried, and a precursor is obtained; and S3, the precursor is heated to 700-800 DEG C in an inert atmosphere for pyrolysis, and the carbon nano tube packaged zero-valent iron is obtained. The carbon nanotube packaged zero-valent iron has excellent H2O2 catalysis performance and reductive dehalogenation capability, can realize efficient degradation of organic pollutants in water, especially halogenated organic pollutants, can be used for effective remediation of organic pollutants in wastewater, underground water and polluted soil, and has a wide application prospect.

This disclosure refers to ferric citrate tablets and pharmaceutical forms.

The application discloses a method for fixing and magnetically separating arsenic in water by using biological mineralization, and comprises the following steps: S1, liquid medium preparation: dissolving 60% (volume) sodium lactate solution, sodium nitrate, potassium dihydrogen phosphate, magnesium sulfate heptahydrate and yeast extract in deionized water according to proportions, adjusting the pH of the medium solution to 6.9-7.0, and performing high-pressure sterilization after being divided into small portions; S2, inoculating bacteria liquid into the sterilized medium to perform amplification culture; S3, preparing a standard arsenic solution; S4, preparing iron citrate and ferrous chloride solutions; S5, MSR-1 biological control mineralization synthesis of magnetosomes; S6, MSR-1 induced bivalent iron precipitation for arsenic removal; and S7, magnetic separation of bacteria-iron-arsenic mixture. The method realizes the fixation and separation of arsenic in water, retains the advantages of low cost and environmental friendliness of the biological mineralization for repairing contaminated water, and overcomes the disadvantages of low repair efficiency and potential pollution caused by the inability to recycle.

The application provides a phosphorus-free corrosion inhibition pre-film agent and a preparation method thereof, and belongs to the technical field of phosphorus-free corrosion inhibition pre-film agents, and comprises the following steps: step S1, a carrier loaded with tannic acid-zinc gluconate is prepared, and is subjected to APTES amination and PTMS hole sealing treatment to obtain an acid-sensitive film supplement carrier; step S2, tannic acid, sodium tungstate dihydrate, zinc gluconate, sodium lauroyl sarcosinate, 2-undecyl imidazoline, polyvinyl alcohol, a water-based dispersant, ethylene-vinyl acetate copolymer and the acid-sensitive film supplement carrier are dispersed in deionized water to obtain component A; ammonium iron citrate is dissolved in deionized water to obtain component B; step S3, when used, component A and component B are uniformly mixed to obtain the phosphorus-free corrosion inhibition pre-film agent. The application can achieve the purposes of phosphorus-free rapid film formation, dense and wash-resistant film layer and stable component storage.

The invention discloses a modification method of a layered transition metal oxide positive electrode material, which comprises the following steps: (1) preparing nickel acetate tetrahydrate, ferric citrate, manganese acetate tetrahydrate, anhydrous citric acid and sodium acetate trihydrate into a mixed solution, and uniformly stirring in a water bath of 60 DEG C; (2) drying the solution obtained in the step (1) by using a spray dryer to obtain precursor powder, and drying the precursor powder in a 60 DEG C blast oven for one night to obtain powder 1; (3) putting the powder 1 obtained in the step (2) into a tabletting mold, and compacting the powder 1 for 1 minute under different pressures (0MPa, 10MPa, 15MPa and 20MPa) by a tabletting machine to obtain compacted powder 2; and (4) performing heat treatment on the powder 2 in the step (3) to finally obtain materials under different pressures (0MPa, 10MPa, 15MPa and 20MPa). The modification method of the layered transition metal oxide positive electrode material is simple, low in cost and environment-friendly, and meanwhile, the obtained referable modification method is applied to a sodium ion battery positive electrode and can provide excellent cycle stability.