587 results about "Aspartic acid" patented technology

The invention discloses a potassium fulvate chelated macroelement water-soluble fertilizer with stress resistance and growth promotion functions, and relates to the technical field of water-soluble fertilizers, the potassium fulvate chelated macroelement water-soluble fertilizer comprises the following raw materials by weight: 167-210 parts of mineral source potassium fulvate, 450-460 parts of potassium nitrate, 300-310 parts of urea, 150-160 parts of potassium dihydrogen phosphate, 30-40 parts of potassium sulfate, 15-25 parts of EDTA-disodium, and 5-15 parts of citric acid. 0.5 to 1.5 parts of brassinolide and 4 to 6 parts of polyaspartic acid; according to the potassium fulvate chelated macroelement water-soluble fertilizer with the stress-resistant and growth-promoting functions, through chelation cooperation of potassium fulvate and nitrogen, phosphorus and potassium, the solubility of the chelated phosphorus element in water is increased, and the chelated phosphorus element can be more uniformly distributed in soil; by adopting an EDTA-disodium and citric acid composite chelating system, volatilization and loss of nitrogen elements are reduced, the problem of precipitation of calcium, magnesium and phosphorus is solved, and the soil conditioner is suitable for hard water areas and especially has outstanding performance in saline-alkali soil and arid areas.

The invention discloses a cyclic nonapeptide with repairing and anti-oxidation effects and application of the cyclic nonapeptide, the amino acid sequence of the cyclic nonapeptide is cyclic (arginine-glycine-aspartic acid-serine-arginine-lysine-valine-lysine-serine), the prepared cyclic nonapeptide has the repairing and anti-oxidation effects, and the cyclic nonapeptide has the repairing and anti-oxidation effects. The composition can be applied to preparation of cosmetics with repairing and / or anti-oxidation effects.

The invention belongs to the technical field of bioengineering, and relates to a transaminase mutant, a recombinant genetically engineered bacterium and application of the transaminase mutant in catalytic synthesis of (R)-1-Boc-3-aminopiperidine.The transaminase mutant is obtained by conducting single-point or combined mutation on the 131 site and / or the 197 site of an amino acid sequence shown in SEQ ID NO.2; the mutation sites comprise that the 131 phenylalanine is mutated into aspartic acid, threonine or tyrosine, and / or the 197 lysine is mutated into arginine or leucine. Experimental results show that compared with wild type transaminase, the catalytic activity, the thermal stability and the organic solvent tolerance of the obtained mutants, especially single-point mutants MyTA1-F131Y and MyTA1-K197R and a combined mutant MyTA1-F131Y-K197R, are all remarkably improved, and compared with the wild type transaminase, the catalytic activity, the thermal stability and the organic solvent tolerance of the obtained mutants are all remarkably improved. The mutant MyTA1-F131Y-K197R can be used for efficiently catalyzing asymmetric amination of N-Boc-3-piperidone to synthesize (R)-1-Boc-3-aminopiperidine, the conversion rate of the (R)-1-Boc-3-aminopiperidine after the (R)-1-Boc-3-aminopiperidine reacts for 24 hours under the condition that the substrate concentration is 100 g / L can reach 90% or above, and the mutant MyTA1-F131Y-K197R has a good industrial application prospect.

The invention provides a method for detecting free amino acids in camellia oleosa seed oil, and establishes a method for detecting the free amino acids in the camellia oleosa seed oil based on ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS / MS), which comprises the following steps: pre-treating various amino acids in the camellia oleosa seed oil by using a non-derivation method; the problems of complicated operation, impurity interference and the like caused by derivatization are avoided, the extraction solvent is environment-friendly and economical, the extraction efficiency is high, and the pretreatment time is greatly shortened; then selecting a proper chromatographic column and a mobile phase, separating a plurality of free amino acids under the condition of not introducing excessive derivatization agents and ion pair reagents, and controlling the collection time to be 12 minutes. The method for detecting the free amino acids in the camellia oleosa seed oil has the characteristics of no need of derivatization treatment, simplicity and convenience in operation, high detection efficiency and good sensitivity and accuracy, and can effectively separate and detect 14 free amino acids such as alanine, phenylalanine and aspartic acid in the camellia oleosa seed oil.

The invention relates to the technical field of adhesives, and particularly discloses a low-formaldehyde environment-friendly adhesive and a preparation method thereof. The invention relates to a low-formaldehyde environment-friendly adhesive which is prepared from the following raw materials in parts by mass: 30-50 parts of modified starch, 15-25 parts of vegetable protein, 5-10 parts of modified nano cellulose, 2-5 parts of a composite cross-linking agent and 80-150 parts of water, the composite cross-linking agent comprises amino silane and polyaspartic acid; the modified starch is prepared by performing graft copolymerization on starch subjected to enzymolysis by alpha-amylase and composite anhydride; the vegetable protein is subjected to alkalization and heat treatment before being used; the modified nano-crystalline cellulose is prepared by performing ring-opening etherification reaction on nano-crystalline cellulose, epoxypropane and ethylene oxide in sequence. The low-formaldehyde environment-friendly adhesive prepared by the invention has relatively good bonding strength and relatively low formaldehyde emission.

The invention relates to the technical field of sewage treatment, in particular to a preparation method of a degradable bactericide for an oil field. According to the invention, a hydroxypropyl guanidine gum-polycaprolactone-ethylenediamine fragment copolymer is taken as a carrier, a methylisothiazolinone quaternary ammonium salt (Q-MIT) bactericide is loaded, and the degradable bactericide for the oil field is obtained by cooperating with a dodecyl ethyl sulfide (TC-SE) bactericide and combining with sodium polyaspartate. A carrier forms a hydrogen bond with a polar group on the surface of a biological membrane through a hydroxypropyl guanidine gum main chain to realize targeted anchoring, a polycaprolactone branched chain encapsulates Q-MIT through a hydrophobic effect, primary amino groups of ethylenediamine are introduced to form a pH sensitive Schiff base bond with Q-MIT, and the primary amino groups and adipic dihydrazide form a thermal response hydrazide bond to construct a dual dynamic covalent bond, so that controlled release of Q-MIT is realized, and the biomembrane is prepared. And moreover, the components of the whole system are connected through degradable chemical bonds, so that the environmental protection property and sustainability of oil field operation are guaranteed.

The invention discloses an amino acid composition for treating alopecia and application of the amino acid composition in preparation of a medicine for treating alopecia, and belongs to the field of medicine configuration products, the amino acid composition is composed of a targeting core intervention component and an auxiliary strengthening synergistic component, the targeting core intervention component is prepared from 30-50 parts of arginine, 50-155 parts of lysine and 50-120 parts of glutamic acid, and the auxiliary strengthening synergistic component is prepared from an auxiliary strengthening synergistic component and an auxiliary strengthening synergistic component. 10 to 40 parts of cysteine and 20 to 60 parts of leucine; the auxiliary strengthening synergistic component is prepared from 15 to 45 parts of tyrosine, 15 to 40 parts of glycine, 10 to 40 parts of glutamine, 20 to 35 parts of serine, 5 to 25 parts of alanine, 2 to 20 parts of aspartic acid and 15 to 35 parts of phenylalanine; the composition can be used as an active ingredient to be prepared into different dosage forms such as a pigmentum, a spray, an ointment and a liniment, is applied to prevention of alopecia and promotion of hair growth, and has a remarkable treatment effect.

In order to improve aggregation property of a PPR protein, the A6 amino acid of the 1st PPR motif from the N-terminus (M1) is made more hydrophilic. Further, the A9 amino acid of M1 is made to be a hydrophilic amino acid or glycine. The A6 amino acid is preferably asparagine or aspartic acid, and the A9 amino acid is preferably glutamine, glutamic acid, lysine, or glycine. Proteins containing such a PPR motif as M1 motif may have not only improved aggregation property, but also high binding power to a target nucleic acid.

The invention discloses a fermentation process for shortening a fermentation period and efficiently synthesizing Ectoine. The fermentation process comprises the following steps: screening and activating high-yield strains, preparing a fermentation culture medium, performing fermentation culture, performing sectional dissolved oxygen regulation and control, performing double-stage pH dynamic regulation and control, performing carbon-nitrogen ratio dynamic regulation based on metabolic flow analysis, performing osmotic pressure gradient induction in the later stage of fermentation, and extracting and purifying a product. According to the fermentation process for shortening the fermentation period and efficiently synthesizing the Ectoin, the expression quantity of key enzymes for synthesizing the Ectoin is increased by 80% or above compared with that of an original strain through the Halomonassp.ECT-09 strain bred through ultraviolet-nitrosoguanidine compound mutation, the basic yield reaches 35 g / L, a foundation is laid for high yield, and the method is suitable for industrial production. A glucose-trehalose mixed carbon source and a yeast extract-ammonium nitrate mixed nitrogen source are adopted, and an L-aspartic acid-L-asparagine mixed precursor is added, so that the metabolic pathway is shortened, and the loss of an intermediate product is reduced.

The invention belongs to the technical field of petrochemical anticorrosion, and provides a multifunctional water-soluble corrosion inhibitor for an oil refining device and a preparation method of the multifunctional water-soluble corrosion inhibitor, and the corrosion inhibitor is a functionalized grafted copolymer obtained by a ring-opening reaction of a succinimide ring on a polysuccinimide intermediate and a plurality of amino-containing compounds; the amino-containing compound at least comprises gemini imidazoline quaternary ammonium salt with a corrosion inhibition function; a polyaspartic acid chain segment precursor with scale inhibition and dispersion functions; the organic amine compound has targeted chelating and pH buffering functions and contains sulfonic acid groups and carboxyl groups; according to the invention, double-anchored gemini imidazoline quaternary ammonium salt is taken as a corrosion inhibition core, and a polysuccinimide ring-opening grafting process is combined, so that chain segments with corrosion inhibition, scale inhibition, targeted buffering and temperature-sensitive self-repairing functions are covalently integrated into a same polymer main chain, and multi-functional efficient protection of a single agent in an oil refining device water phase system is realized.

The application discloses a bifunctional HMGR mutant, which is obtained by replacing aspartic acid at the 154th amino acid of the amino acid sequence of natural HMGR with other amino acids. The application also discloses a nucleotide sequence and an amino acid sequence. The application further discloses a preparation method and application of the bifunctional HMGR mutant. The HMGR mutant of the application has high activity to both NADP(H) and NAD(H) substrates, and has significantly improved catalytic activity in a certain pH range.

Disclosed is an isolated or purified T cell receptor (TCR), wherein the TCR has antigenic specificity for a mutated human RAS amino acid sequence with a substitution of (i) glycine at position 13 with aspartic acid or (ii) glutamine at position 61 with arginine. Related polypeptides and proteins, as well as related nucleic acids, recombinant expression vectors, host cells, populations of cells, and pharmaceutical compositions are also provided. Also disclosed are methods of detecting the presence of cancer in a mammal and methods of treating or preventing cancer in a mammal.

The present disclosure relates to a genetically modified microorganism satisfying some of predetermined conditions. The predetermined conditions include: (I) succinate dehydrogenase activity or fumarate reductase activity being reduced or inactivated relative to a wild-type microorganism; (II) lactate dehydrogenase activity being reduced or inactivated relative to the wild-type microorganism; (III) the genetically modified microorganism having modified phosphoenolpyruvate carboxylase activity showing resistance to feedback inhibition by aspartic acid in wild-type phosphoenolpyruvate carboxylase activity, or exogenous phosphoenolpyruvate carboxylase activity having higher resistance to feedback inhibition by aspartic acid than that of the wild-type phosphoenolpyruvate carboxylase activity shown by the wild-type microorganism; and (IV) pyruvate:quinone oxidoreductase being reduced or inactivated relative to the wild-type microorganism.

The invention discloses an application of a biomarker in evaluating the risk of progressing from autoimmune hepatitis to cirrhosis. The biomarker comprises immune globulin G, and / or an antinuclear antibody, and / or aspartate aminotransferase and alanine aminotransferase. Independent predictive factor indexes of the liver cirrhosis risk of an autoimmune hepatitis patient in the biomarker are as follows: an antinuclear antibody ANA index: log2ANA is greater than or equal to 1.62; the AAR index of the ratio of aspartate aminotransferase to alanine aminotransferase is as follows: AAR is greater than or equal to 1.62; the immune globulin G, namely the IgG index, is greater than or equal to 30.3 g / L. The problems that in the prior art, an AIH risk model does not take cirrhosis as the outcome, visual presentation is lacked, prediction efficiency is insufficient, and clinical early-stage accurate risk layering and diagnosis and treatment decision requirements are difficult to meet are solved.

The application relates to the technical field of beef cattle breeding, and particularly discloses a compound preparation for promoting the feed intake, daily weight gain and improving the meat quality of beef cattle and application thereof, which is prepared from the following components in percentage by volume: 40% of micro-ecological preparation, 30% of hawthorn, 10% of medicated leaven, 10% of malt, 5% of areca nut and 5% of dried tangerine or orange peel; the compound preparation is prepared from microorganisms and multiple natural Chinese herbal medicines in a specific and scientific matching ratio; experiments prove that the compound preparation can increase the feed intake of beef cattle by 11.33%, increase the daily weight gain by 16.16%, and significantly shorten the breeding cycle; meanwhile, the contents of aspartic acid, threonine, glutamic acid, alanine, valine, isoleucine, leucine, tyrosine, phenylalanine, lysine, arginine and proline in the muscle are significantly increased, the nutritional quality and flavor taste of beef are effectively improved, the preparation is natural, residue-free and side-effect-free, the preparation method is simple, the cost is low, and the preparation has extremely high practical value and popularization prospect.

The application discloses a compound fertilizer for promoting cotton high yield and a preparation method thereof, relates to the technical field of cotton fertilizer, and comprises first mother liquor A, second mother liquor B and third mother liquor C which are prepared, stored and packaged separately; the first mother liquor A contains urea phosphate, monoammonium phosphate, anhydrous citric acid, malic acid and manganese sulfate monohydrate; the second mother liquor B contains commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt type polyaspartic acid solution, purified fulvic acid clear liquid and tri-potassium citrate; and the third mother liquor C is a mixed system of polyol complex state boron clear pre-liquid and medium complex state zinc pre-liquid. The application can improve the effective state stability of phosphorus, zinc and boron, reduce the risks of precipitation fouling and dripping head blockage, alleviate the risks of local salt peak and root injury in the seedling stage, promote the uniform emergence and young root growth of cotton, and improve the yield.

The invention relates to the technical field of biological medicines, and discloses hyaluronic acid modified metal coordination albumin nanoparticles as well as a preparation method and application thereof. The hyaluronic acid modified metal coordination albumin nanoparticle comprises a core and a hyaluronic acid shell layer, wherein the core is formed by self-assembly of an albumin-drug compound, poly-L-aspartic acid and ferric ions through coordination, and the hyaluronic acid shell layer is connected to the surface of the core through coordination or adsorption. According to the hyaluronic acid modified metal coordination albumin nanoparticles as well as the preparation method and the application thereof, the preparation method is simple, convenient and rapid, does not need complex covalent modification, is mild in condition and is easy for large-scale production, and the prepared nanoparticles are uniform in particle size, good in stability and high in stability. In addition, due to the fact that the hyaluronic acid is modified on the surface, the active targeting capacity on CD44 receptor high-expression tumor cells is achieved, the enrichment and treatment effects of the medicine on the tumor site are remarkably improved, and the application prospect in preparation of the anti-tumor medicine is wide.

The invention discloses a phytase mutant AppA as well as a coding gene, a preparation method and application thereof. The phytase mutant AppA is obtained by mutating amino acids at the 137th site, the 185th site and the 255th site of wild type phytase AppA from asparagine, aspartic acid and tyrosine into valine, asparagine and aspartic acid respectively; the amino acid sequence and the nucleotide sequence of the gene are SEQ ID NO.1 and SEQ ID NO.2 respectively. The catalytic efficiency of the mutant enzyme AppA provided by the invention on sodium phytate is improved by 2.5 times compared with that of a wild enzyme AppA; under the condition of 70 DEG C, the half-life period of the mutant enzyme AppA is 3.4 times that of the wild enzyme AppA. The mutant enzyme AppA has the characteristic of high enzyme activity under a high-temperature condition, which indicates that the mutant enzyme AppA has an important application prospect in industrial production of a feed in which phytic acid needs to be degraded under the high-temperature condition.

The present disclosure provides a method of reducing, preventing or treating an intestinal infection, preventing or treating a disease associated with protozoan parasite of the genus Eimeria, inhibiting an oocyst sporulation of a protozoan parasite or preventing a sporozoite invasion or reproduction, preventing or treating coccidiosis, promoting growth performance, controlling, treating and / or preventing necrotic enteritis in a subject, comprising administering to the subject an effective amount of a composition comprising a Crassocephalum rabens (CR), a bioactive extract thereof (CRE), an active ingredient(s) contained in a CR (CR_API) or CRE (CRE_API), a combination of two or more of a CR, a CRE, a CR_API and a CRE_API, or one or more of a-linolenic acid, citric acid, lactic acid, mannitol, palmitic acid, aspartic acid and 1-monomyristin.

The application relates to the field of genetic engineering, and discloses an Aspergillus niger, a construction method and application of the Aspergillus niger, and a method for producing citric acid and / or succinic acid. Aspergillus niger The Aspergillus niger is obtained by simultaneously overexpressing alpha-amylase and aspartic protease in a starting strain. The Aspergillus niger provided by the application can realize efficient degradation and conversion of starch by synergistically overexpressing amyA genes and pepA genes, solve the technical bottleneck that the original strain is limited in growth in a starch-based fermentation system and has insufficient acid production capacity, can efficiently produce succinic acid and citric acid by taking low-cost starch as the only carbon source, significantly reduce the industrial production cost of organic acid, and promote the green and sustainable upgrading of the fermentation industry.

The present application provides: a variant polypeptide having an activity of aspartate 1-dicarboxylase; a microorganism including same; a composition for producing beta-alanine or beta-alanine-derived compounds, the composition comprising the microorganism; and a method for producing beta-alanine or beta-alanine-derived compounds, the method comprising a step for culturing the microorganism.

The invention relates to the technical field of crop planting, in particular to application of aspartic acid and asparagine in plant planting. The initiator comprises an aspartic acid solution and / or an asparagine solution; the concentration of the aspartic acid solution is 25 [mu] M; the concentration of the asparagine solution is 1000 [mu] M; the invention also discloses application of aspartic acid and asparagine in preparation of a seed initiator. According to the application of the aspartic acid and the asparagine in plant planting, the aspartic acid and the asparagine are used as initiators, the problems of existing initiators are solved, meanwhile, the aspartic acid and the asparagine are plant endogenous amino acids and are non-toxic, biodegradable and environmentally friendly, meanwhile, the initiators are easy to obtain, the using method is simple, and the application range is wide. The method is suitable for large-scale agricultural application.

The invention discloses a synthesis method of N-goose deoxycholyl-L-aspartic acid and application of the N-goose deoxycholyl-L-aspartic acid in preparation of a medicine for improving metabolism-related fatty liver diseases. According to the method provided by the invention, chenodeoxycholic acid and L-dimethyl aspartate hydrochloride are taken as raw materials, and a chenodeoxycholic acid-dimethyl aspartate intermediate is synthesized, so that a target compound-N-chenodeoxycholyl-L-aspartic acid with a brand new structure is efficiently prepared. The compound shows a treatment effect superior to that of obeticholic acid (OCA) in an animal model, and can effectively improve multiple indexes such as fatty degeneration, inflammation and fibrosis of the liver. The invention provides a brand new solution for major clinical challenges of insufficient curative effect, large side effect, drug withdrawal rebound and the like of the current MAFLD treatment drug, and provides a candidate compound with a wide prospect for developing a novel efficient MAFLD treatment drug.

The invention relates to the field of slow-release fertilizers, in particular to preparation of a hydrogel slow-release fertilizer. The invention discloses a preparation method of a slow release fertilizer of polyaspartic acid, carboxymethyl cellulose hydrogel, stearic acid and urea. Comprising the following steps: (1) preparing polysuccinimide, (2) preparing a polyaspartic acid gel solution by using the polysuccinimide, and then preparing a polyaspartic acid / carboxymethyl cellulose hydrogel solution by using the polyaspartic acid gel solution; the method further comprises the following steps: (3) preparing stearic acid / urea particles; 4, the polyaspartic acid / carboxymethyl cellulose hydrogel solution and the stearic acid / urea granules are used for preparing and obtaining the polyaspartic acid-carboxymethyl cellulose hydrogel-stearic acid-urea slow-release fertilizer.By means of the method, the slow-release fertilizer with the dual functions of water retention and slow release can be prepared and obtained.

The application belongs to the technical field of agricultural fertilizer, and particularly relates to a high-efficiency yield-increasing liquid fertilizer containing enzymatic nereid and a preparation method thereof, which comprises the following steps: washing and crushing nereid, and then performing freeze-thaw cycle pretreatment; under weak alkaline conditions, a complex protease preparation containing protease and chitinase is used for enzymolysis, and an enzymatic nereid liquid is obtained through solid-liquid separation; urea, phosphate-potassium fertilizer, trace elements, potassium fulvate and polyaspartic acid are mixed in a preparation tank, and then N-carbamoyl-L-glutamic acid-chitosan graft copolymer and seleno-cysteine-alginic acid nanometer microspheres are added to obtain a nutrient liquid; finally, the enzymatic nereid liquid, the nutrient liquid and a plant growth regulator are mixed to obtain a finished product. Through the biological enzymolysis technology, the active substances in the nereid are fully released, the prepared liquid fertilizer has the functions of nutrient supply, physiological regulation and soil improvement, can significantly promote crop growth and increase yield, and realizes high-value utilization of marine biological resources.

This invention discloses a nanoRNA delivery system and its application in the control of Sclerotinia sclerotinia disease, relating to the field of biotechnology. The preparation method of the nanoRNA delivery system includes the following steps: mixing chitosan, sucrose, and aspartic acid uniformly and then subjecting them to a hydrothermal reaction to obtain a quantum dot-chitosan degradation product complex; mixing the quantum dot-chitosan degradation product complex with double-stranded RNA to obtain the nanoRNA delivery system; the double-stranded RNA is used to silence Sclerotinia sclerotinia virulence-related transcription factor genes. The nanoRNA delivery system provided by this invention can effectively protect RNA and exhibits a very high inhibitory effect on Sclerotinia sclerotinia in plants, providing a novel technical solution for the green and precise control of Sclerotinia sclerotinia disease.

The invention discloses a sulfur-nitrogen co-doped carbon quantum dot modified polyaspartic acid derivative as well as a preparation method and application thereof. The derivative is prepared by taking citric acid and L-cysteine as precursors, synthesizing sulfur-nitrogen co-doped carbon quantum dots (SN-CDs) with rich functional groups on the surface by adopting a hydrothermal method, and introducing the sulfur-nitrogen co-doped carbon quantum dots into a side chain of polyaspartic acid (PASP) through graft copolymerization. The derivative not only retains the complexing ability of polyaspartic acid with metal ions such as calcium and magnesium, but also has excellent scale and corrosion inhibition performance; the optical characteristics of the carbon quantum dots are inherited, and stable fluorescence can be emitted under the excitation of specific wavelength, so that in-situ and real-time concentration monitoring in an industrial circulating cooling water system by utilizing a fluorescence spectrum technology is supported. The product does not contain phosphorus, is environment-friendly, conforms to the development trend of a green water treatment technology, and provides an innovative material solution for intelligent monitoring and fine management of a circulating water system while improving the comprehensive performance of scale and corrosion inhibition.

The application provides an imide secondary amine-based resin and a preparation method thereof, and relates to the technical field of amino resins. The structure of the imide secondary amine-based resin is wherein X is selected from a divalent organic structure with an average molecular weight of 50-5000 which is left after removing two primary amino groups from a diamine compound and is inert to an isocyanate group at 100 DEG C, R1 and R2 are independently selected from C5-C6 cycloalkyl, C6-C12 substituted cycloalkyl, C1-C20 alkyl or C2-C20 substituted alkyl, and the end groups of R1 and R2 are independently not -OH or -NH2. The imide secondary amine-based resin has better heat resistance, hydrolysis resistance and higher mechanical strength compared with aspartic ester resin.

The invention belongs to the technical field of nano materials, and particularly discloses a magnetic nano titanium dioxide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a Fe < 2 + > / Fe < 3 + > mixed solution with a titanium source to form a uniform mixed solution; (2) dropwise adding a dispersing agent into the mixed solution, and stirring and mixing to obtain a reaction system; (3) carrying out heating and ultrasonic treatment on the system, adding an alkali source to adjust the pH value of the reaction system, and continuing the reaction; (4) after the reaction is finished, separating magnetic particles by adopting an external magnetic field, washing, and carrying out vacuum drying to obtain a Fe3O4 / TiO2 composite material; and the dispersing agent is a cocamidopropyl betaine or polyaspartic acid aqueous solution. The particle size of the prepared particles can be as low as 130 nm, PDIlt; 0.3 part; the saturation magnetization is greater than or equal to 40 emu / g, and the magnetic recovery efficiency within 30 seconds is greater than or equal to 90%; the degradation rate of visible light to organic pollutants within 50 minutes is greater than or equal to 57.8%, and the particle size change 1t within 72 hours under the condition that the pH value is 7-11; 15%; the magnetic nano titanium dioxide composite material disclosed by the invention has important application potential in the fields of photocatalysis and industrial wastewater treatment.

The present application relates to a kind of preparation method of nitrogen-oxygen co-doped nanoporous carbon material and its application, with the following steps: resorcinol, polyaspartic acid potassium, polyvinyl alcohol, 4-dimethylaminopyridine are dissolved in distilled water stirring 10~60 minutes, then add sepiolite powder, ultrasonic oscillation at room temperature 30~60 minutes, finally add formaldehyde aqueous solution, seal, continue ultrasonic oscillation 1~3 hours, obtain gel product;The gel product obtained is dried to obtain intermediate;The intermediate obtained is carbonized to obtain black product;The black product obtained is pickled and washed with water, dried to obtain nitrogen-oxygen co-doped nanoporous carbon material.The porous carbon material obtained by the present application has large specific surface area and strong adsorption capacity, and the preparation method has high reaction yield.