51 results about "Tetrabutylammonium hydroxide" patented technology

The invention discloses a topological chemical polymerization method based on discotic liquid crystals, and relates to the technical field of liquid crystal polymers. The method comprises the following steps: dissolving 3, 4, 5-tri (hexyloxy) phenylacetonitrile and 1, 3, 5-benzenetricarboxaldehyde in ethanol, adding tetrabutyl ammonium hydroxide, and reacting at 50-60 DEG C for 1-3 hours to obtain a discotic liquid crystal monomer; placing the discotic liquid crystal monomer on a substrate, heating the discotic liquid crystal monomer until the temperature is greater than or equal to 200 DEG C to enable the discotic liquid crystal monomer to be in a molten state, then pressing the discotic liquid crystal monomer to form a thin film, then cooling the discotic liquid crystal monomer to 70-80 DEG C, and then irradiating the thin film sample for 12-48 hours by using ultraviolet light to obtain the one-dimensional polymer material based on the topological chemical polymerization of the discotic liquid crystal. According to the method, the application range of topological chemical polymerization is widened, more adjustability is given to the topological chemical polymerization process, and new possibility is provided for the field of topological chemistry.

The invention belongs to the technical field of cables, and particularly relates to a weather-proof new energy automobile charging cable which is composed of a cable core, a shielding layer wrapping the cable core and a sheath layer wrapping the shielding layer. Each cable core is composed of a conductor and an insulating layer. The invention discloses a preparation method of a traditional Chinese medicine. A sheath layer of the weather-resistant new energy automobile charging cable is prepared from 70 to 90 parts of thermoplastic elastomer (TPE), 20 to 30 parts of lignin, 25 to 30 parts of propylene oxide, 20 to 25 parts of furfuryl alcohol, 2 to 5 parts of 4-chloromethyl styrene, 1.5 to 3 parts of tetrabutyl ammonium hydroxide, 5 to 6 parts of methylbenzene, 10 to 25 parts of methyl tert-butyl ether, 45 to 7 parts of anhydrous MgSO4, 0.5 to 2.5 parts of initiator, 2 to 3 parts of cross-linking agent, 5 to 8 parts of metal salt additive and 1 to 3 parts of lubricant. 0.3 to 0.6 part of antioxidant and 3 to 4 parts of color master batch.

The invention provides a method for preparing high-purity flaky alumina based on a hydrolysis method, and belongs to the field of high-purity flaky alumina powder. The method comprises the steps that metal aluminum scraps are pretreated; the method comprises the following steps: putting metal aluminum scraps, an alkaline organic matter catalyst and a morphology control agent into water, and carrying out a hydrolysis reaction at a set temperature for a set time to obtain a reaction mixed solution; carrying out solid-liquid separation, washing and drying on the reaction mixed solution to obtain flaky aluminum hydroxide; and roasting the flaky aluminum hydroxide to remove crystal water so as to obtain high-purity flaky aluminum oxide, wherein the alkaline organic matter catalyst comprises at least one of the following components: tetraethylammonium hydroxide, tetramethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide; the morphology control agent comprises at least one of ammonium bifluoride and ammonium fluoride. The preparation method disclosed by the invention is simple in process flow, free of an impurity removal process, mild in reaction condition, short in reaction time and free of environmental pollution, and the product is regular in shape and high in purity.

The invention provides a chemical composition for removing etching residues, which comprises organic ammonium, a corrosion inhibitor, an organic solvent, an inhibitor, hydroxylamine and deionized water, the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide, and the organic ammonium is selected from one or more of choline hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutyl ammonium hydroxide, tributyl methylammonium hydroxide, benzyl trimethyl ammonium hydroxide, ethyl trimethyl ammonium hydroxide, diethyl dimethyl ammonium hydroxide and tris (2-ethoxyl) methylammonium hydroxide; the inhibitor is selected from one or more of fructose, galactose, lactose, maltose, glucose, ascorbic acid, hydroxylamine sulfate and ethanol hydrazine. Compared with the prior art, the chemical composition for removing the etching residues can effectively remove the residues after plasma etching, meanwhile, etching of AlCu, TiN / Ti and silicon oxide is avoided, an operation window is large, and the chemical composition has good application prospects in the semiconductor etching process.

The invention discloses a water-repellent and oil-repellent fabric and a preparation method thereof, and belongs to the technical field of fabric finishing. The preparation method of the water-repellent and oil-repellent fabric comprises the following steps: taking fabric gray cloth, carrying out dipping pretreatment, washing with hot water, washing with warm water, washing with cold water, and airing; soaking the pre-treated gray fabric in the finishing liquid, soaking twice and rolling twice, pre-drying, baking, washing and drying to obtain the water-repellent and oil-repellent fabric, the finishing liquid comprises a finishing agent and a solvent, wherein the finishing agent is a short-chain fluorine-based acrylate polymer mainly prepared from double-side symmetric fluorine-based acrylate monomers, octadecyl acrylate, butyl acrylate, methyl methacrylate, acrylic acid-2-hydroxyethyl ester and 5-hydroxyl amyl acrylate as raw materials; the finishing aid comprises a mixed solution of starch grafted carbon nanotubes, tetrabutyl ammonium hydroxide, deionized water, glycerol, calcium chloride, a hydrochloric acid solution and epichlorohydrin; the surface of the fabric is treated by preparing the finishing liquid, so that the water-repellent and oil-repellent effects of the fabric are enhanced.

The present invention belongs to the technical field of molecular sieve synthesis, and specifically discloses a method for synthesizing a multi-level hole ZSM-5 molecular sieve nanosheet with controllable b-axis thickness. Including: first, preparing seed crystals with tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, the crystallization temperature is 50-70 ° C; second, after mixing tetrapropylammonium hydroxide solution with tetrabutylammonium hydroxide solution, mixing with water, tetraethyl orthosilicate and the seed crystals, stirring, then adding aluminum source solution, stirring at room temperature overnight, and obtaining mixed solution II; after ammonium fluoride is dissolved in water, it is added to mixed solution II, stirred vigorously, and then loaded into a hydrothermal crystallization kettle, crystallized at 170 ° C for 60h, centrifuged after water cooling, washed with water to neutral multiple times, dried and roasted, and prepared multi-level hole ZSM-5 molecular sieve nanosheets. The present invention uses tetrabutylammonium hydroxide, which is more affordable, as the main template, to synthesize multi-level hole ZSM-5 nanosheets with micropores and intercrystalline mesopores in situ, thereby improving the structural stability of the molecular sieve.

The invention relates to a nucleoside triphosphate tetrabutylammonium salt and a preparation method thereof. The nucleoside triphosphate tetrabutylammonium salt is prepared by reaction with nucleoside triphosphate and tetrabutylammonium hydroxide as raw materials. The invention prepares the nucleoside triphosphate tetrabutylammonium salt by using simple and readily available raw materials, has low requirements on process equipment, and can prepare milligram-level products.

The invention belongs to the technical field of eutectic gels, and particularly discloses a severe environment-resistant eutectic gel as well as a preparation method and application thereof. The preparation method comprises the following steps: etching Ti3AlC2 with hydrofluoric acid to prepare MXene, and modifying MXene with a tetrabutylammonium hydroxide intercalation to obtain a tetrabutylammonium hydroxide intercalated MXene nanosheet; the preparation method comprises the following steps: by taking tetrabutylammonium chloride and thymol as raw materials, mixing, heating and stirring to obtain a deep eutectic solvent, sequentially adding isobornyl methacrylate, acrylic acid-2-phenoxyethyl ester, ethylene glycol dimethacrylate, diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide and tetrabutylammonium intercalated MXene nanosheets into the deep eutectic solvent, stirring in a dark place, and carrying out vacuum drying, so as to obtain a finished product. And performing photo-crosslinking curing under ultraviolet irradiation to obtain the eutectic gel. The eutecticevaporate gel prepared by the invention not only has good mechanical properties, but also has good toughness, self-adhesion, freezing resistance, high temperature resistance, moisture resistance, drying resistance and excellent strain sensitivity, and overcomes the defect that the traditional hydrogel and hydrophilic eutecticevaporate gel are not moisture-resistant; the method has wide application prospects in the fields of flexible strain sensors, intelligent wearable devices, bionic electronic skins, medical health monitoring or intelligent soft robots and the like.

The invention relates to the field of medicine detection, in particular to a method for detecting the content of gluconate radicals in a liquid preparation. The detection method comprises the following steps: detecting the gluconate radical-containing liquid preparation dissolved by a sodium hydroxide solution through a high performance liquid chromatography, and the chromatographic conditions are as follows: a chromatographic column takes octadecyl bonded silica gel as a filler; the mobile phase comprises a mobile phase A and a mobile phase B; the mobile phase A is a mixed solution of a tetrabutylammonium hydroxide solution and acetonitrile in a volume ratio of (85-95): (5-15), the mobile phase B is a mixed solution of a tetrabutylammonium hydroxide solution and acetonitrile in a volume ratio of (30-50): (50-70), and the pH value of the tetrabutylammonium hydroxide solution is adjusted to 6.0-8.0 by adopting phosphoric acid; and gradient elution is carried out. According to the detection method, interference of impurities and other related substances in the liquid preparation can be avoided, the detection method is high in operability, easy and convenient to operate, high in sensitivity, good in repeatability and high in accuracy, the content of gluconate radicals in the liquid preparation medicine can be more accurately detected, and medicine quality control is facilitated.

The invention discloses a preparation method and application of an X-type oxygen production molecular sieve, and belongs to the technical field of oxygen production molecular sieves. The preparation method comprises the following steps: by taking metakaolin, aluminum oxide and silicon dioxide as raw materials, adding a template agent formed by mixing tetrabutylammonium hydroxide and modified graphene into a sodium hydroxide solution, crystallizing to prepare an X-type molecular sieve, and preparing the X-type oxygen generation molecular sieve from lithium chloride and calcium chloride, a gas diffusion path is shortened, phosphoryl of the didecyl phenyl phosphite improves the thermal stability of the graphene oxide, and the compression strength of the molecular sieve is improved in the modified graphene doped molecular sieve; the lithium chloride and calcium chloride modified molecular sieve improves the nitrogen-oxygen separation coefficient; the prepared X-type oxygen generation molecular sieve has excellent nitrogen-oxygen separation performance and mechanical strength.

A method for quantifying the magnesium ion amount in a soil sample, the method including: extracting calcium ions from a soil sample to produce a soil sample substantially free of calcium: mixing the substantially free calcium soil sample with ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid tetrasodium salt (EGTA) to produce a first sample; mixing the first sample with an indicator reagent to produce a second sample; and determining the magnesium ion amount of the second sample; wherein the indicator reagent comprises o-cresolphthalein complexone (OCPC) and tetrabutyl ammonium hydroxide (TBAH). Also, a system and a kit using the method.

The application discloses a water-repellent and oil-repellent fabric and a preparation method thereof, and belongs to the technical field of fabric finishing. The preparation method of the water-repellent and oil-repellent fabric comprises the following steps: taking fabric grey cloth for immersion pretreatment, washing with hot water, washing with warm water, washing with cold water, and airing; immersing the pretreated fabric grey cloth in a finishing liquid, twice immersion and twice pressing, pre-drying, baking, washing, and drying, so that the water-repellent and oil-repellent fabric is obtained; the finishing liquid comprises: a finishing agent, which is mainly prepared from a short-chain fluorine-containing acrylate polymer with raw materials of a double-side symmetrical fluorine-containing acrylate monomer, octadecyl acrylate, butyl acrylate, methyl methacrylate, 2-hydroxyethyl acrylate and 5-hydroxyamyl acrylate; and a finishing auxiliary agent, which comprises a starch grafted carbon nanotube, tetrabutylammonium hydroxide, deionized water, glycerol, calcium chloride, a hydrochloric acid solution and a mixed solution of epichlorohydrin; the surface of the fabric is treated by preparing the finishing liquid, so that the water-repellent and oil-repellent effect of the fabric is enhanced.

The invention belongs to the technical field of chemical catalysis, and provides a preparation method and application of a modified MCM-22 molecular sieve catalyst. Unroasted MCM-22 (P) is used as a raw material, organic alkali (such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide or tetrabutylammonium hydroxide) is adopted for modification treatment, and then ion exchange and roasting are performed to obtain the hydrogen type modified molecular sieve. Organic alkali has the synergistic effect of alkali treatment and structure guiding, and the crystal phase purity and framework integrity are maintained while controllable desilicication is achieved. The catalyst is used for alkylation removal reaction of thiophenic sulfur in styrene, the selectivity of mono-substituted alkylation products is remarkably improved, and side reaction of styrene polymerization is effectively inhibited. The preparation method is simple, the catalytic performance is excellent, and the catalyst has a good industrial application prospect.

The invention belongs to the technical field of zeolite molecular sieve preparation, and particularly discloses a preparation method and application of a Ni-EMT zeolite molecular sieve.The Ni-EMT zeolite molecular sieve is prepared by using a complex of nickel nitrate hexahydrate and ethylenediamine as a nickel source and a template agent and using relatively cheap tetrabutyl ammonium hydroxide and tetraethylammonium hydroxide as synergistic template agents. According to the present invention, the Ni-EMT zeolite molecular sieve is directly prepared by using the one-pot method, the prepared Ni-EMT zeolite molecular sieve has characteristics of high crystallinity, stable molecular sieve structure, large specific surface area and large pore, and compared with the traditional method, the use of the expensive and high-toxicity 18-crown ether-6 template agent is avoided, and the metal nickel is coated in the EMT molecular sieve in situ so as to achieve the purpose of the in-situ preparation of the Ni-EMT zeolite molecular sieve. According to the present invention, the nickel loading amount of the Ni-EMT zeolite molecular sieve prepared by the method can be adjusted, such that the Ni-EMT zeolite molecular sieve can be used for the catalytic reactions such as the preparation of cyclohexylbenzene through the hydroalkylation of benzene, and can be widely used in the actual industrial application.

The present disclosure relates to a kind of UZM-8 molecular sieve and its preparation method, catalyst and application containing UZM-8 molecular sieve, the method includes: the raw material mixture containing silicon aluminum source, first template agent, second template agent and water is carried out hydrothermal crystallization reaction and recovers product;Wherein, the first template agent is at least one selected from tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide, the second template agent is dimethyl diethyl ammonium hydroxide.Compared with the UZM-8 molecular sieve synthesized by traditional hydrothermal method, the UZM-8 molecular sieve with high crystallinity, high specific surface area and pore volume can be synthesized in the present disclosure, while the synthesis cost of molecular sieve is significantly reduced.

The present invention discloses an in-situ ring-opening polymerization reinforcement method for bone and dentin cultural relics, which comprises the following steps: (1) After washing the bone and dentin cultural relics, they are soaked in an aqueous solution of 0.5% tetrabutylammonium hydroxide or tetramethylammonium hydroxide, with a solid-liquid ratio of 1:(4-10). After treatment, they are soaked in deionized water to wash away the unreacted reagents; (2) The pretreated bone and dentin cultural relics are soaked in a 3-7 wt% N-carboxy cyclic anhydride solution for 0.5-2 hours. After treatment, the reinforcement is completed after the solvent volatilizes. The present invention solves the disadvantages of high solution viscosity and poor permeability existing in the direct use of polymer materials. Moreover, polyamino acids have a chemical structure similar to collagen, are well compatible with bone and dentin cultural relics, effectively make up for the loss of collagen in bone and dentin cultural relics, and improve the mechanical strength of cultural relics.

The invention relates to the field of medicine detection, in particular to a method for detecting sodium calcium edetate in infantile faropenem sodium granules, which comprises the following steps: detecting an infantile faropenem sodium granule test solution complexed by a ferric trichloride solution through high performance liquid chromatography, chromatographic conditions comprise that a chromatographic column adopts a C18 column; the mobile phase comprises a mobile phase A containing a tetrabutyl ammonium hydroxide solution and a mobile phase B containing acetonitrile, and the mobile phase A adopts phosphoric acid or acetic acid to adjust the pH value to 6.0-8.0; the gradient elution procedure comprises a first elution stage, a second elution stage and a third elution stage which are continuously carried out. According to the detection method provided by the invention, interference of auxiliary materials and other related substances in the preparation can be avoided, the detection method is high in specificity, the content of sodium calcium edetate in the infantile faropenem sodium granules can be more accurately detected, and quality control of medicines is facilitated.

The application discloses application of phosphorus nickel in a hydrogen production process by electrolysis of water, and the phosphorus nickel is prepared by the following method: dissolving a nickel metal salt in water to prepare a nickel metal salt aqueous solution; heating tetrabutylammonium hydroxide to melting to obtain a tetrabutylammonium hydroxide melt; adding the nickel metal salt aqueous solution into the tetrabutylammonium hydroxide melt, and reacting under heating to generate a flaky nickel-containing precursor; under the protection of a protective atmosphere, phosphorizing the flaky nickel-containing precursor with a phosphorus source to generate the phosphorus nickel in a flaky structure, which has low crystallinity and excellent hydrogen evolution catalytic activity, and can be applied in the field of hydrogen production by electrolysis of water, and has excellent hydrogen evolution effect.

The present invention proposes a cobalt single-atom catalyst loaded on Mo2TiC2Tx and its preparation method and application, which belongs to the field of catalyst technology. The method comprises the following steps: adding Mo2TiAlC2 powder to HF solution, stirring for reaction; washing and collecting the supernatant, washing with ethanol, washing with aerated deionized water, centrifuging, freeze-drying, and obtaining a black powder for use; taking the above black powder and adding it to tetrabutylammonium hydroxide solution, stirring at room temperature, washing the obtained suspension with aerated deionized water, adding deionized water for use; taking the above suspension in a beaker, adding Co(NO3)2·6H2O, stirring at room temperature until completely mixed, adding NaBH4 solution, stirring at room temperature, washing with aerated deionized water for several times, and freeze-drying to obtain a black powder. The catalyst of the present invention improves the catalytic activity and can increase the pollutant removal rate to 100% within 10 minutes, which is of great significance for actual sewage treatment.

The application discloses a preparation method of a fullerol-silver modified PVDF ultrafiltration membrane and belongs to the technical field of PVDF ultrafiltration membrane modification. 60 The C 60 (OH) n is oxidized into a hydrophilic C 60 (OH) n by using a tetrabutylammonium hydroxide (TBAH) base type catalysis method, Ag atoms are grown in-situ on the C 60 (OH) n by using an in-situ growth method, and a C 60 (OH) n -Ag compound is obtained. 60 (OH) n The prepared C 60 (OH) n -Ag modified PVDF ultrafiltration membrane has high water permeability, high interception, high porosity and uniform pore size distribution, is a novel C 60 (OH) n -Ag modified PVDF ultrafiltration membrane which integrates good hydrophilic performance, strong tensile capacity, good acid and alkali corrosion resistance, strong antibacterial effect and excellent anti-pollution performance, and has good effects on wastewater treatment containing organic pollutants and is expected to be applied to the field of wastewater treatment.

The invention provides a method for recovering and reusing a solvent in a production process of a regenerated cellulose material, which comprises the following steps: carrying out coarse filtration treatment on waste liquid generated in the production process of the regenerated cellulose material to obtain coarse filtrate; treating the coarse filtrate by using anion exchange resin to obtain an eluent; enabling the eluent to pass through a multi-stage series membrane filtration platform so as to remove micro-nano impurities in the eluent, and separating tetrabutylammonium hydroxide, dimethyl sulfoxide and water at the same time, so as to obtain recycled tetrabutylammonium hydroxide, recycled dimethyl sulfoxide and recycled pure water; mixing the recycled tetrabutylammonium hydroxide and the recycled dimethyl sulfoxide according to a ratio, and then, applying the mixture to the production of regenerated cellulose fibers. The method is simple to operate, low in energy consumption, green and environment-friendly, and realizes high-efficiency and low-cost recovery and reutilization of the tetrabutyl ammonium hydroxide solvent and the dimethyl sulfoxide solvent.

The application discloses a preparation method and application of X-type oxygen production molecular sieve and belongs to the technical field of oxygen production molecular sieve.The present application uses metakaolin, alumina and silicon dioxide as raw materials, adds a template agent mixed by tetrabutylammonium hydroxide and modified graphene into a sodium hydroxide solution, crystallizes to obtain X-type molecular sieve, and then obtains X-type oxygen production molecular sieve through lithium chloride and calcium chloride.The template agent can induce the growth of the molecular sieve in a two-dimensional direction, shortens the gas diffusion path, the phosphoryl of didecylphenyl phosphite improves the thermal stability of the graphene oxide, and the modified graphene improves the pressure strength of the molecular sieve in the molecular sieve;the modified molecular sieve through lithium chloride and calcium chloride improves the nitrogen-oxygen separation coefficient;and the X-type oxygen production molecular sieve prepared by the present application has excellent nitrogen-oxygen separation performance and mechanical strength.

The present invention is intended to provide a cerium-oxide chemical mechanical polishing solution. Adding a quaternary ammonium compound to a cerium-oxide polishing solution can increase the polishing rate of SiN to 1.5 times or more, and the polishing rate of TEOS is virtually unaffected. By taking tetrabutylammonium hydroxide and benzyltriethylammonium chloride as an example, the content of which is 200-1,000 ppm, a pH of the polishing solution in the range of 4.0-6.0 can improve the polishing rate of the polishing solution for SiN.

The application provides a method for recycling and reusing solvents in a regenerated cellulose material production process, comprising: performing rough filtration on waste liquid generated in the regenerated cellulose material production process to obtain a rough filtrate; treating the rough filtrate with an anion ion exchange resin to obtain an eluate; passing the eluate through a multi-stage series membrane filtration platform to remove micro-nano impurities in the eluate, while separating tetrabutylammonium hydroxide, dimethyl sulfoxide and water, to obtain recovered tetrabutylammonium hydroxide, recovered dimethyl sulfoxide and recovered pure water; and mixing the recovered tetrabutylammonium hydroxide and the recovered dimethyl sulfoxide in a certain proportion and then using them for the production of regenerated cellulose fibers. The method is simple in operation, low in energy consumption and green in environment protection, and realizes efficient and low-cost recycling and reuse of tetrabutylammonium hydroxide solvent and dimethyl sulfoxide solvent.

The invention relates to a nucleoside triphosphate tetrabutyl ammonium salt and a preparation method thereof, nucleoside triphosphate and tetrabutyl ammonium hydroxide are used as raw materials to react to prepare the nucleoside triphosphate tetrabutyl ammonium salt, the nucleoside triphosphate tetrabutyl ammonium salt is prepared from the simple and easily available raw materials, the process equipment requirement is low, and a milligram-scale product can be prepared.

The invention discloses a method for analyzing edetate disodium in heparin sodium, and belongs to the technical field of medicine analys.The method comprises the steps that a 0.3% tetrabutylammonium hydroxide buffer solution (the pH value is adjusted to 4.0 through phosphoric acid)-water-acetonitrile (20: 45: 35) is used as a mobile phase; the flow rate is 1.0 ml per minute; the detection wavelength is 254 nm; the column temperature is 40 DEG C; the sample injection volume is 20 microliters. According to the method disclosed by the invention, the edetate disodium in the heparin sodium can be effectively separated, so that separation and determination of the heparin sodium and the edetate disodium are realized, and quality control of raw materials and preparations of the heparin sodium and the edetate disodium is realized.

The application discloses a method for characterizing lignin in environmental samples, and belongs to the technical field of lignin detection. The method comprises the following steps: oxidizing a sample by using a CuO / NaOH system; acidifying supernatant; extracting the supernatant by using diethyl ether; further purifying the diethyl ether extract by using a pretreated silica gel column; performing a methylation reaction on the sample by using tetrabutylammonium hydroxide / iodomethane in dichloromethane; diluting the methylation product mixture after neutralization by using diethyl ether; and purifying the reaction mixture by using a silica gel column. The combination of diethyl ether extraction and silica gel column chromatography removes most of the impurities in the sample, and the solvent can be quickly removed under reduced pressure, so that the operation complexity is greatly reduced. The time consumed for gas chromatography maintenance is greatly reduced. The main operation is performed under the protection of gas, so that the operation complexity is greatly reduced. The methylated lignin phenol is stable to air and water, and no obvious change is found after being stored in a refrigeration chamber for one week. The method has no limitation on the number of simultaneous analysis, and is suitable for the conventional lignin characterization of geochemical samples with high lignin content.

The present application relates to the technical field of analytical detection, and in particular to a method and kit for detecting folate and 5-methyltetrahydrofolate in human whole blood. The kit comprises a protective agent Vc solution, folate calibrators and / or quality control products, 5-methyltetrahydrofolate calibrators and / or quality control products, rabbit whole blood diluent, sample extraction solution A containing saturated zinc sulfate solution, sample extraction solution B containing a mixture of methanol, acetonitrile and isopropyl alcohol, tetrabutylammonium hydroxide phosphate buffer and acetonitrile. The kit not only meets the performance indicators, but also has good stability. The detection method and the matching kit have the advantages of low detection cost, simple detection steps and important role in evaluating the content of folate and its metabolites in human whole blood samples.

The invention discloses a ruthenium-based catalyst and a preparation method and application thereof, and relates to the technical field of oxygen evolution reaction catalysis, the preparation method of the ruthenium-based catalyst comprises the following steps: S1, mixing sodium carbonate, ruthenium powder and ruthenium dioxide according to a preset molar ratio, and carrying out a solid-phase reaction in an inert atmosphere to obtain a mixture; s2, soaking the mixture in a sodium persulfate solution; s3, washing the mixture treated in the step S2, and performing soaking exchange on the washed mixture and a hydrochloric acid solution for multiple times; s4, mixing the mixture treated in S3 with a tetrabutyl ammonium hydroxide solution, and carrying out a hydrothermal reaction; s5, dispersing the mixture subjected to the hydrothermal reaction into water, and performing freeze drying treatment; and S6, calcining the mixture subjected to freeze drying treatment to prepare the ruthenium-based catalyst. The metastable-phase two-dimensional 1T-phase ruthenium oxide catalyst is prepared through ion intercalation assisted phase change, and the electro-catalysis oxygen evolution reaction activity and the structural stability are remarkably improved.

The application provides a Mo2TiC2 loaded platinum catalyst and a preparation method and application thereof, and belongs to the technical field of nanometer catalysts.The preparation method comprises the following steps: sequentially performing hydrofluoric acid etching, tetrabutylammonium hydroxide stripping and centrifugal washing on Mo2TiAlC2 to obtain few-layer or / and single-layer Mo2TiC2;mixing and stirring the Mo2TiC2 with a platinum precursor solution, performing hydrothermal treatment, and performing centrifugal washing to obtain Mo2TiC2 two-dimensional material loaded with platinum particles with a size of 0.2-4.5 nanometers.The Mo2TiC2 loaded platinum catalyst obtained by the application has low platinum content, the platinum particles are uniformly dispersed, and the platinum particles are stably arranged on the surface of the Mo2TiC2, and the Mo2TiC2 loaded platinum catalyst exhibits excellent performance and stability in water electrolysis for hydrogen production, thereby providing an effective way for realizing high-efficiency industrial electrolysis for hydrogen production.