278 results about "Aqueous ethanol" patented technology

The invention discloses a preparation method and application of a bimetallic sulfide / three-dimensional porous carbon catalyst, and relates to the technical field of electrolyzed water catalysts.The preparation method comprises the following steps that melamine sponge is cleaned, and the clean melamine sponge is obtained; the preparation method comprises the following steps: dissolving metal salt 1 and metal salt 2 in an ethanol aqueous solution, and adding alkali and an aniline monomer to obtain a precursor solution; completely soaking the clean melamine sponge in a precursor solution, carrying out constant-temperature hydrothermal reaction, and sequentially washing and drying to obtain the melamine sponge anchored with bimetal ions; introducing inert gas for protection, and performing high-temperature vulcanization treatment to obtain the three-dimensional porous carbon catalyst embedded with the bimetallic sulfide heterostructure. The catalyst comprises uniformly dispersed bimetallic sulfide nanoparticles and a spongy three-dimensional porous carbon carrier, shows excellent bifunctional catalytic activity and stability when being applied to an electro-catalytic water decomposition reaction, and has a wide application prospect.

The invention relates to a medicine for skin regeneration and repair and a preparation method thereof, and belongs to the technical field of biological medicine, the medicine comprises cyperus esculentus extract peptide, brooklet anemone root tremella extract, rhodomyrtus tomentosa root-suberect spatholobus stem-radix cyathulae composite extract, pomegranate peel polyphenol and the like. The cyperus esculentus extracted peptide is a product which is more than 1kDa and is obtained by performing enzymolysis on cyperus esculentus through cellulase, alpha-chymotrypsin and ficin protease in sequence and then performing purification through a G-50 sephadex column; the tremellodon gelatinosum tremella extract is a product which is less than 3kDa and is obtained by performing common enzymolysis on tremellodon gelatinosum tremella sporocarp through cellulase and bromelain; the rhodomyrtus tomentosa root-suberect spatholobus stem-radix cyathulae composite extract is a product obtained by performing gradient extraction on rhodomyrtus tomentosa root, suberect spatholobus stem and radix cyathulae through an ethanol water solution to obtain an extract, and performing polyamide resin column adsorption and LH-60 sephadex column purification in sequence. A good repairing system is constructed by multiple components, and wound repairing and healing are accelerated.

The invention belongs to the technical field of agricultural and sideline food processing, and discloses sweet potato pectin with high intestinal fermentation characteristic based on a magnetic induction electric field, and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing starch-removed sweet potato residues with an acid solution, performing magnetic induction electric field treatment, and centrifugally collecting supernate; s2, mixing and stirring the supernate obtained in the step S1 and an ethanol water solution, then carrying out alcohol precipitation standing treatment, and centrifugally collecting a precipitate; mixing the precipitate with water, and performing dialysis and concentration treatment to obtain a concentrate; and carrying out freeze drying treatment on the concentrate to obtain the sweet potato pectin. According to the method, a magnetic induction electric field technology is combined with traditional acid solution extraction, so that the intestinal fermentation characteristic of the sweet potato pectin is effectively enhanced.

The invention provides a drilling fluid and a preparation method thereof. The drilling fluid comprises the following raw materials: water, bentonite, sodium hydroxide, a filtrate reducer, an inhibitor, potassium chloride, a tackifier, a lubricant, a plugging agent, a film-forming agent and barite. Wherein the film-forming agent is prepared from the following raw materials in parts by weight: 50 to 60 parts of organic silicon solvent, 80 to 100 parts of ethanol water solution, 10 to 15 parts of polyurethane particles and 10 to 15 parts of nano silicon dioxide. The drilling fluid provided by the invention can prevent the drilling fluid or filtrate thereof from entering fine and micro-nano cracks of a shale well section, so that the influence of hydration or capillary force on a shale stratum is reduced, and the well wall stability problem in shale drilling can be fundamentally solved.

This invention discloses a method for preparing sodium houttuynia cordata, comprising the following steps: adding sodium methoxide and toluene to a reaction vessel, heating, then slowly adding nonanone and ethyl formate, and after the addition is complete, reacting with a gradient cooling process, and post-processing to obtain an aqueous phase containing intermediate I; adding the aqueous phase containing intermediate I and toluene to the reaction vessel, stirring, cooling, and rapidly introducing liquid sulfur dioxide, continuously stirring and reacting at 0-10°C for 5-15 minutes, cooling, and filtering to obtain crude sodium houttuynia cordata. The preparation method of this invention directly introduces liquid sulfur dioxide during the sulfonation reaction, greatly shortening the process time, while achieving high product yield and purity, and requiring less sulfur dioxide. Furthermore, in the post-processing of sodium houttuynia cordata, adding toluene to the reaction solution beforehand can effectively transfer the generated impurities to the toluene; recrystallization using a 50 v / v% ethanol aqueous solution removes water-soluble and oil-soluble impurities while further reducing the risk of fire and explosion during centrifuge operation.

This invention discloses a Jacaranda flower extract, its preparation method, and its applications, belonging to the field of pharmaceutical technology. The preparation method includes: drying and pulverizing Jacaranda flowers, extracting them by heating and reflux with an ethanol-water solution, concentrating the extract under reduced pressure to obtain a first crude extract; mixing the first crude extract with an aqueous two-phase mixture for extraction, concentrating the upper phase under reduced pressure to obtain a second crude extract; purifying and eluting the second crude extract using a macroporous resin, decolorizing the eluent, and drying to obtain the Jacaranda flower extract. The Jacaranda flower extract obtained by this method has clearly defined active ingredients, exhibits significant photoprotective effects against UVB, and demonstrates significant repair effects after UVB photodamage. It is highly safe and can be used as an active ingredient in skincare products for sun protection.

A high specific surface area mesoporous alumina material with a surface rich in hydroxyl groups is produced by dissolving an aluminum source in an anhydrous organic alcohol solvent containing organic carboxylic acids, slowly and uniformly adding an aqueous ethanol solution to form an alumina sol, drying to obtain an alumina gel, and then treating with high-temperature steam at 400–650°C to obtain a material with... c Mesoporous alumina materials with Al2O3 crystal phase structure, well-developed mesoporous channel structure, high specific surface area and pore volume, and containing 5.0-10.0 mmol / g aluminum hydroxyl groups on the surface of mesoporous pore walls are suitable as catalyst supports for dehydrogenation reactions. The highly uniform loading of metal Pt active components significantly improves the low-temperature reaction activity, selectivity and stability of the catalyst for efficient dehydrogenation of liquid organic hydrogen supports.

This invention belongs to the field of curing agent technology, specifically relating to a composite curing agent, its preparation method, and its application. The composite curing agent comprises the following raw materials in parts by weight: 40-50 parts crushed stone, 20-30 parts cement, 5-10 parts quicklime, 4-10 parts activator, 3-8 parts modified bentonite, and 0.3-0.5 parts crack-resistant agent. The preparation process of the modified bentonite is as follows: (1) Pretreated bentonite is added to an ethanol aqueous solution, then KH570 is added, and the mixture is stirred under heating conditions to obtain pre-modified bentonite; (2) The pre-modified bentonite is added to N,N-dimethylformamide, then diallyl malate and an initiator are added, and the mixture is heated to obtain the modified bentonite. This composite curing agent can significantly improve the mechanical properties and crack resistance of the cured soil.

The invention belongs to the technical field of catalysts, and discloses a mesoporous high-entropy sulfide (CoMnNiZnFe) S2 catalyst, a preparation method and application in preparation of formic acid through electrooxidation of PET hydrolysate, oleic acid is used as a stabilizer, nitrate and urea are mixed in an ethanol aqueous solution, the urea is gradually decomposed in the hydrothermal reaction process to form isocyanic acid and ammonia for controlling the pH value of the solution, and the pH value of the solution is controlled; the method comprises the following steps: reacting metal salt with isocyanic acid to form an M (OH) 2CO3 nano-plate, reacting the metal salt with CO2 released by the isocyanic acid to form the M (OH) 2CO3 nano-plate, calcining the M (OH) 2CO3 nano-plate in air to form a mesoporous high-entropy oxide, and vulcanizing the mesoporous high-entropy oxide to obtain the mesoporous high-entropy sulfide. The electro-catalysis result shows that excellent formic acid selectivity and cycling stability are shown, waste utilization of PET and efficient production of formic acid are achieved, and the application and development requirements of related fields are met.

The invention provides a basil seed total polyphenol extraction method and a basil seed total polyphenol extract.The extraction method comprises the following steps that a basil seed raw material is subjected to degreasing treatment through a degreasing solvent, and a degreased raw material is prepared; carrying out ultrasonic extraction on the degreased raw material by adopting an ethanol water solution to obtain basil seed total polyphenol; wherein the degreasing solvent comprises petroleum ether; the volume ratio of ethanol in the ethanol aqueous solution is 40-80%; based on g / mL, the material-liquid ratio of the degreased raw material to the ethanol water solution is 1: (20-70); the ultrasonic extraction time is 20 to 70 minutes. According to the extraction method, the extraction efficiency of the basil seed total polyphenol can be improved, and damage to polyphenol activity is reduced.

The application discloses a method for separating and purifying ginsenoside F2 from fermentation liquor, and belongs to the technical field of separation and purification. The method comprises the following steps: taking the fermentation liquor from a tank, centrifuging, taking the lower precipitate, adding ethanol to stir and extract, filtering after extraction, and spin-drying the filtrate to obtain a crude product; then dissolving the crude product in an ethanol aqueous solution with a volume fraction of 10-40% to form a sample solution; then performing sample loading on YLT810 resin, and after sample loading is completed, washing impurities with an ethanol aqueous solution with a volume fraction of 45-50%, and when the liquid-phase purity of the target product reaches 70-75%, eluting with an ethanol aqueous solution with a volume fraction of 60-65%, collecting the eluate, and spin-drying to collect the solid, so that ginsenoside F2 is obtained. The method can obtain ginsenoside F2 with a purity of more than 85%, and the yield can reach more than 80%, and is suitable for industrial production.

The application provides an extraction and purification method for synthesizing phytosphingosine through whole-cell fermentation, which comprises the following steps: performing enzymolysis, ceramic membrane permeation and concentration on a fermentation liquor to obtain a bacteria slurry liquor; adding a strong base to the bacteria slurry liquor and performing primary hydrolysis under heating to obtain a hydrolysis liquor; adjusting the pH value of the hydrolysis liquor to 7-8, and then performing extraction, centrifugation, concentration, purification, purification, filtration and drying to obtain high-purity N-acetyl phytosphingosine; adding the high-purity N-acetyl phytosphingosine into an ethanol aqueous solution, adding a strong base into the ethanol aqueous solution, and performing secondary hydrolysis under heating to obtain a phytosphingosine reaction liquor; and performing crystallization, recrystallization, centrifugation and drying on the phytosphingosine reaction liquor to obtain the phytosphingosine. The extraction and purification method releases the cell contents by using lysozyme, removes water-soluble impurities through a ceramic membrane, and retains tetraacetyl phytosphingosine phytosphingosine, and is efficient and fast.

The application discloses a method for producing ethanol by poplar enzymolysis fermentation, and adopts metal chloride and ethanol aqueous solution to pretreat poplar firstly, and then carries out simultaneous saccharification and fermentation to produce ethanol; the metal chloride is aluminum chloride and / or chromium chloride. After the poplar is pretreated by the method, the simultaneous saccharification and fermentation is carried out, when the substrate concentration of the poplar is 30%, the yield of glucose produced by poplar enzymolysis can reach 62.28 g / L; when the substrate concentration of the poplar is 32%, the yield of glucose produced by poplar enzymolysis can reach 64.85 g / L. The method can effectively remove lignin, improve the reaction activity of cellulase, effectively improve the efficiency of poplar enzymolysis fermentation, and improve the yield of ethanol.

The invention relates to the field of inductance magnetic materials, and discloses a nanocrystalline alloy magnetic powder core and a preparation method and application thereof. The nanocrystalline alloy magnetic powder core is prepared from the following raw materials in parts by weight: 100 parts of insulated iron-based nanocrystalline alloy magnetic powder, 1.5-2.5 parts of a binder, 0.5-1.5 parts of a coupling agent and 0.2-0.6 part of a lubricant, the insulation treated iron-based nanocrystalline alloy magnetic powder is prepared by treating iron-based nanocrystalline alloy magnetic powder, aluminum oxide micro powder, isopropyl distearoyloxy aluminate, tribenzyl aluminate, an ethanol water solution and a pH regulator. The nanocrystalline alloy magnetic powder core prepared by the invention is applied to radio frequency inductors and power supply inductors, is used under long-term high-frequency and high-temperature conditions, has better magnetic performance stability, and is not easy to generate magnetic loss and not easy to crack.

The invention discloses a method for analyzing the average hydrogen bond association strength of an ethanol water solution, which is characterized in that the average hydrogen bond association strength of the ethanol-water solution is defined as the product of the average hydrogen bond life and the average hydrogen bond number, so that the average hydrogen bond association strength of the ethanol-water solution is obtained. NMR experimental data of ethanol-water solutions with different concentrations are obtained through existing data; s2, establishing molecular dynamics initialization models of the ethanol-water solutions with different concentrations by using Packmol; s3, acquiring parameters for calculating the hydrogen bond association strength of the model by using Gromacs software, and calculating the hydrogen bond association strength; s4, drawing a comparison graph of the experimental data and the calculation data through Origin; s5, changing concentration and temperature parameters, and verifying the reasonability of the model; and S6, verifying the universality of a theoretical calculation result through an interface phase model. The average hydrogen bond strength is calculated through simulation, the evaluation time is shortened, the evaluation efficiency is improved, and the evaluation cost is reduced.

The invention belongs to the field of functional substance research, and particularly relates to a corn extract for promoting GLP-1 secretion and a preparation method and application thereof. The corn extract provided by the invention is a dry product obtained by soaking dry powder of fresh corn kernels in ethanol or an ethanol water solution at room temperature and then performing ultrasonic extraction; the fresh corn comprises yellow and sweet corn; the temperature of the ultrasonic extraction is 30-60 DEG C; the power of the ultrasonic extraction is 50 to 150W; the ultrasonic extraction time is 30 to 90 minutes. The preparation method of the corn extract provided by the invention is simple and easy to implement, and the production cost of functional components can be effectively reduced. The corn extract provided by the invention can effectively promote intestinal L cells to secrete GLP-1 in a healthy state and an insulin-resistant state, and synchronously improve the cell viability.

The invention belongs to the technical field of functional food and active substance delivery, and relates to EGCG (epigallocatechin gallate) loaded protein-polysaccharide ternary composite nanoparticles and a preparation method thereof. Zein is used as carrier protein, Arabic gum is used as stable polysaccharide, and an anti-solvent precipitation method is combined with ultrasonic treatment to prepare the composite nanoparticles. The preparation method specifically comprises the following steps: dissolving zein in an ethanol water solution to form an organic phase, dissolving Arabic gum in a water phase, adding the water phase into the organic phase under a stirring condition, removing ethanol to obtain a zein-Arabic gum binary composite nanoparticle dispersion liquid, introducing EGCG, and carrying out ultrasonic-assisted loading and drying to obtain a target product. The encapsulation efficiency of the active substance is improved through the ultrasonic-anti-solvent synergistic effect, the thermal stability and storage stability of the system are improved, and the method is simple, good in repeatability and suitable for delivery of food-grade active ingredients.

A method for resolving a phenylalanine derivative of formula (I), and an intermediate. The method comprises: a resolving step comprising using a resolving reagent to react with the phenylalanine derivative represented by formula (I) in a reaction solvent to obtain a resolved intermediate, wherein the resolving reagent is selected from N-acetyl-D-phenylalanine and / or (2R,3R)-(−)-dibenzoyl-L-tartaric acid, and the reaction solvent is selected from 90-99% aqueous ethanol, absolute ethyl alcohol, or acetone. The method uses a chiral reagent to perform salt formation and racemate resolution, and has the advantages of being easy to operate, requiring no special production devices, and being easy to scale up production.

The invention discloses a preparation process of an ovateleaf holly bark total saponin bulk drug, and particularly relates to the field of traditional Chinese medicine extraction and purification, the preparation process comprises the following steps: S1, extraction: crushing an ovateleaf holly bark medicinal material, and carrying out reflux extraction by using an ethanol aqueous solution as a solvent to obtain an ovateleaf holly bark crude extract; and S2, purification: carrying out solid-liquid separation on the crude ovateleaf holly bark extract, and purifying the filtrate through a recrystallization process and a macroporous resin adsorption process in sequence to obtain the ovateleaf holly bark total saponin bulk drug. According to the invention, an effective component group of ovateleaf holly bark for treating ulcerative colitis is taken as a target, the effective component group comprises syringin, pedunculoside and ziyuglycoside II, and a complete extraction-purification integrated process is constructed; through an orthogonal test, a comprehensive weighted scoring method is combined, and extraction parameters are scientifically optimized, so that the transfer rate of the three functional components is maximized, the extraction efficiency is high, and the pertinence is extremely high.

The invention discloses a magnetic nano-material and application thereof in extraction of fluoroquinolone compounds, and the magnetic nano-material is prepared by mixing an aqueous solution of Fe3O4 (at) SiO2 microspheres with NH2 modified surfaces and an ethanol aqueous solution of fluorinated graphene according to a volume ratio of (2-4): (1-3) and then stirring. The magnetic nano material is used as a magnetic solid-phase extraction adsorbent and can be used for extracting fluoroquinolone compounds in a sample. The magnetic nano material disclosed by the invention not only can efficiently extract various fluoroquinolone compounds in simple matrixes such as water, milk and the like, but also can directly enrich and extract various fluoroquinolone compounds in complex matrixes such as cosmetics and the like without tedious and time-consuming purification steps; and high-throughput detection of various trace fluoroquinolone compounds in a sample can be realized.

The present application relates to the technical field of polyester degradable plastics, and particularly relates to a bio-degradable bubble film bag puncture resistance reinforcement process. The bio-degradable bubble film bag puncture resistance reinforcement process comprises the following steps: dust and oil removal on the surface of a formed bubble film bag, heat treatment to obtain a pretreated bubble film bag; soaking the pretreated bubble film bag in a Tris-HCl buffer solution, adding dopamine hydrochloride into the Tris-HCl buffer solution, air bubbling and ultrasonic treatment, vacuum drying to obtain a surface-activated bubble film bag; adding a silane coupling agent into an ethanol aqueous solution, stirring, adding nano calcium carbonate and graphene oxide into the ethanol aqueous solution, stirring, filtering, washing, vacuum drying to obtain an activated filler; adding polylactic acid and polylactic acid grafted maleic anhydride into dichloromethane, stirring until uniform, adding the activated filler into the dichloromethane, stirring, adding a leveling agent, continuing to stir, standing and defoaming, low-temperature spraying onto the surface of the surface-activated bubble film bag, roller compounding, heat preservation and natural cooling.

The invention relates to the field of biological medicine manufacturing, in particular to a trollius chinensis bunge anti-inflammatory active component extraction and purification process which comprises the following steps: step (1), weighing trollius chinensis bunge powder and ferroferric oxide powder according to a mass ratio of 100: (1-10) for later use; (2) carrying out ball milling on the trollflower powder and the ferroferric oxide powder to obtain slurry; (3) carrying out microwave extraction on the obtained slurry; (4) carrying out solid-liquid separation to obtain an extracting solution containing flavone; and (5) adsorbing the extracting solution obtained in the step (4) through a macroporous adsorption resin column, then eluting with an ethanol water solution, collecting the eluent, concentrating and drying to obtain a high-purity trollflower flavone product. On the basis of a microwave extraction method, ferroferric oxide powder is introduced, efficient recovery of trollflower flavone is achieved, the product yield reaches 17.5%, and the purity exceeds 57%.

This application relates to the field of food processing technology, specifically to a zein-based oleogloss with a polyphenol self-assembled coating, its preparation method, and its application. The preparation method includes the following steps: dissolving zein in an ethanol-water solution, adjusting the pH to 10-12 for pretreatment, and removing the ethanol by heating and stirring at 30-50°C to obtain a zein dispersion; first adding epigallocatechin gallate, then adding Ca... 2+ A composite particle dispersion was prepared; the composite particle dispersion was mixed with liquid oil to prepare a Pickering emulsion, which was then dried in the dark with cold air to obtain a solid fat; the solid fat was dispersed to prepare a zein-based oleogel based on a polyphenol self-assembled coating; zein, Ca... 2+ The ratio of epigallocatechin gallate to ethyl gallate is 2g:0.05mmol:0.05mmol. The preparation method described in this application is simple and environmentally friendly, suitable for mass production. The prepared zein-based oleogel exhibits good stability, strength, and resistance to deformation, and is not easily oxidized.

The application relates to a two-way stretched polypropylene-based capacitor film and a preparation method thereof, and raw materials include polypropylene resin, fillers, a compatilizer, a nucleating agent and an antioxidant; the compatilizer is obtained by melt extrusion granulation of maleic anhydride grafted polypropylene and BN@SiO2-NH2; BN@SiO2-NH2 is obtained by the following steps: mixing boron nitride and urea in a ball mill, mechanically exfoliating, ultrasonic dispersing in an ethanol aqueous solution, adding tetraethyl orthosilicate and ammonia water, stirring and hydrolyzing to obtain BN@SiO2, and finally reflux grafting with gamma-aminopropyl triethoxysilane to obtain BN@SiO2-NH2. The compatilizer formed by premixing MAH-g-PP and BN@SiO2-NH2 can be uniformly dispersed and avoid agglomeration, and contains BN and SiO2 as fillers, plays a role in strengthening the interface and improving the breakdown strength, and promotes the dispersion of inorganic particles, effectively improving the dielectric constant.

This invention provides a method for preparing camellia oil rich in oleanolic acid, comprising the following steps: (1) washing and draining fresh camellia fruit shells and / or tea leaves, then pulverizing them after vacuum freeze-drying to obtain freeze-dried powder A, and pulverizing dried camellia seed kernels to obtain seed kernel powder B. (2) mixing freeze-dried powder A and seed kernel powder B at a mass ratio of 1:(15-20). (3) adding a 25%-35% ethanol aqueous solution as an extraction solvent to the mixed raw materials, wherein the mass-volume ratio (g:mL) of the mixed raw materials to the extraction solvent is 1:(3-4); using a high-speed shearing device to vigorously stir and crush the mixed system for 3-10 minutes to achieve full cell wall disruption of the plant cells. (4) heating and reflux extraction; (5) three-phase separation and solvent reuse. This method has a high efficiency in transferring oleanolic acid from the raw materials to the oil phase.

The application discloses a kind of synthesis methods of solid phase single-atom catalyst, it is related to catalyst synthesis technical field.The application is after mixing cerium nitrate and manganese nitrate, dissolved in ethanol aqueous solution, obtain solution A;Glycerol and citric acid monohydrate are mixed and dissolved in ethanol aqueous solution, obtain solution B;Solution A and solution B are mixed to form transparent sol;After drying, solid powder is obtained;Solid powder is ball milled and then reduced calcination treatment, then ball milled and then second reduction calcination treatment;Finally, high-temperature calcination and low-temperature calcination treatment are carried out, and solid phase single-atom catalyst is obtained.The solid phase single-atom catalyst prepared by the application has excellent catalytic activity and can improve the denitration efficiency.

The present application belongs to the technical field of extract preparation, and particularly relates to a preparation method of a microalgae extract. The preparation method of the microalgae extract comprises the following steps: (1) adding sterile water to microalgae in a logarithmic growth phase to obtain a microalgae mixture; (2) spraying the microalgae mixture of step (1) on the surface of a culture carrier, and then adding the culture carrier to a microalgae culture medium added with ammonium niobate for culture, and collecting a product; (3) adding the product of step (2) to an ethanol aqueous solution, heating and refluxing for extraction to obtain an extract, and concentrating and drying the extract to obtain the microalgae extract. By using a culture carrier in the culture process of microalgae and adding an ammonium niobate component to the microalgae culture medium, the content of protein and polysaccharide in the prepared microalgae extract is obviously increased.

This invention relates to a method for extracting plant salts from halophytes, belonging to the field of biomass resource recycling technology. The method includes five main steps: raw material pretreatment, salt extraction, ultrasonic-pressing combined desalination, filtration purification, and vacuum freeze-drying. Specifically, the salt extraction step employs a composite extraction system composed of a weakly alkaline ethanol aqueous solution, a choline-based eutectic solvent, and a combination of cellulase / pectinase / xylanase. Under gentle shaking conditions, the halophyte powder is synergistically extracted, significantly improving the dissolution rate of salts and flavor compounds. The ultrasonic-pressing combined treatment further breaks down plant tissues, enhancing the desalination effect. This invention features a simple process flow and high extraction efficiency. The resulting plant salt extract is a white or pale yellow loose porous solid, rich in minerals such as sodium and potassium, as well as various small-molecule amino acids, possessing good nutritional and flavor value, and is suitable as a natural seasoning or nutritional supplement.

The application discloses a method for preparing an electrochemical catalyst from solid humin, and first, solid humin is obtained, then pretreated humin powder, mixed metal salt and thiourea are added into a zirconium oxide or agate ball mill jar, then ethanol solution is added until the powder is just wet; subsequently, grinding balls are added, the jar cover is tightly covered, and the jar is placed in a planetary ball mill for ball milling; after the ball milling is completed, ethanol aqueous solution is used to wash out the slurry in the jar, the mixed solution is thinly spread in a container and transferred to an oven for drying; after drying, flaky particles are formed, which are ground into powder using a mortar and transferred to a porcelain boat and placed in a tube furnace for precalcination under a nitrogen flow; after the calcination is completed, the solid powder is collected, which is the humin derivative carbon supported transition metal sulfide electrocatalyst to be prepared; compared with a traditional carbon supported metal catalyst, the application has multiple advantages of high intrinsic activity, strong structural stability and excellent electronic adjustability in HMF oxidation, and provides an ideal material platform for efficient electrocatalytic conversion of high-purity biomass platform molecules.

The invention relates to the field of automobile films, and discloses an anti-fogging surface TPU film for an automobile film and a preparation method of the anti-fogging surface TPU film, the TPU film is prepared from a thermoplastic polyurethane elastomer, an anti-fogging agent, silane modified nano silicon dioxide, a tetra [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester antioxidant and an N, N '-ethylene bis stearamide lubricant; the silane modified nano silicon dioxide is prepared from an ethanol water solution, acetic acid, gamma-aminopropyltriethoxysilane and nano silicon dioxide; the antifogging agent is prepared from deionized water, polyvinyl alcohol, urea, a phosphoric acid aqueous solution, a sodium hydroxide aqueous solution, epoxy chloropropane and an L-threonine aqueous solution. The TPU film provided by the invention has good antifogging performance, transparency and mechanical properties.