716 results about "Aqueous ethanol" patented technology

The invention discloses a preparation method of a V-shaped porous starch-grease inclusion compound. According to the method, V-type porous starch is used as a raw material and is blended with grease to prepare the starch-grease inclusion compound. The method specifically comprises the following steps: dispersing grease in a 60% ethanol aqueous solution, adding V-shaped porous starch, magnetically stirring for 2 hours at 25-30 DEG C, centrifuging the solution, washing the obtained precipitate twice by absolute ethyl alcohol, freeze-drying the washed precipitate, grinding, and sieving by a 100-mesh sieve, thereby obtaining the V-shaped starch-grease inclusion compound. According to the method, 60% ethanol is adopted as a solvent, efficient embedding of the grease is achieved under the normal temperature condition, and the adverse effect of a traditional heat treatment method on the oxidation stability of the grease is avoided. According to the method, on the basis of a spiral cavity structure and a honeycomb-shaped pore structure of V-shaped porous starch, grease is efficiently embedded in an inner cavity of the starch by utilizing a blending adsorption method, the content of free grease on the surface is reduced through the synergistic effect of physical adsorption and intermolecular acting force, and the stability of grease embedding is improved.

The invention belongs to the technical field of rare earth materials, and discloses a preparation method of high-purity sphere-like nano yttrium oxide powder. The method comprises the following preparation steps: (1) adding Y2O3 powder into concentrated hydrochloric acid, heating, stirring and dissolving, and then diluting with an ethanol water solution to obtain a YCl3 solution; (2) mixing ammonia water, a quaternary ammonium base aqueous solution and ethanol to prepare a precipitant solution, and dropwise adding the precipitant solution into the YCl3 solution in the step (1) for precipitation reaction to precipitate Y < 3 + >; and (3) separating and drying the precipitate obtained in the step (2), and then carrying out high-temperature calcination to obtain the high-purity spheroidal nano yttrium oxide powder. According to the preparation method, the ethanol water solution of YCl3 is used as a reaction solution, ammonia water is used as a main precipitator, quaternary ammonium base is used as an auxiliary precipitator and a surface active structure regulating agent, and yttrium oxide powder with the purity not lower than 5N and the particle size smaller than 100nm can be obtained.

The invention belongs to the field of natural product extraction, and relates to a method for extracting and separating flavonoid compounds from Artemisia chrysantha, which comprises the following steps: carrying out reflux extraction on the dry overground part of Artemisia chrysantha by using 70% ethanol, loading to a balanced D101 macroporous adsorption resin column, sequentially eluting by using water, a 20% ethanol aqueous solution, a 50% ethanol aqueous solution and a 70% ethanol aqueous solution, and collecting the eluent. Four fractions from Fr. I to Fr. IV are obtained; respectively carrying out polyamide column chromatography separation on Fr.II to Fr.IV, and sequentially eluting with a 20% ethanol aqueous solution, a 50% ethanol aqueous solution and a 70% ethanol aqueous solution to respectively obtain three fractions; and further purifying the Fr.II-1, the Fr.II-2, the Fr.III-1, the Fr.III-2, the Fr.III-1 and the Fr.III-3 by virtue of a Sephadex LH-20 column, so as to finally obtain seven flavonoid compounds. According to the method, only the ethanol water low-toxicity solvent is used for extraction and preparation, organic solvents with high toxicity are not used, the method is green and environment-friendly, the extraction efficiency is high, the number of extracted compounds is large, chemical components of the artemisia europaea medicinal material are enriched, the resource source of active components is widened, and a foundation is laid for follow-up research.

The invention belongs to the technical field of ceramic materials, and particularly relates to a high-strength building ceramic material and a preparation method thereof. The high-strength building ceramic material is prepared from the following raw materials in parts by weight: 20 to 30 parts of potassium feldspar, 15 to 23 parts of kaolin, 37 to 45 parts of solid waste-based silicon carbide, 1 to 4 parts of talc, 3 to 8 parts of modified mullite whisker and 2 to 5 parts of filler, a preparation process of the modified mullite crystal whiskers comprises the following steps: (1) adding mullite crystal whiskers into an ethanol water solution containing a silane coupling agent, and heating for reaction to obtain pretreated mullite crystal whiskers; and (2) adding the mullite whiskers pretreated in the step (1) into a nickel sulfate aqueous solution, then adding triethylamine and sodium thiosulfate, and carrying out a heating reaction to obtain the modified mullite whiskers. After the raw material components are combined, preparation of a high-strength ceramic material is facilitated, the heat conductivity coefficient can be increased, the heat conduction effect can be enhanced, and the ceramic material is suitable for common home decoration and high-heat-conductivity floor heating ceramic tiles.

The invention discloses an ethanol-regulated layered metal oxide, a preparation method thereof and an application of the ethanol-regulated layered metal oxide in preparation of a single-walled carbon nanotube by catalytic cracking of methane, alkali liquor and soluble metal salt containing Fe, Mo, Mg and Al are dropwise added into an alkaline ethanol aqueous solution to form a precipitate, and the ethanol-regulated Fe-Mo / MgAl-LDOs catalyst is obtained after aging, drying and calcining. The catalyst is applied to methane catalytic cracking to prepare the single-walled carbon nanotube. According to the technical scheme, the dispersity of active components in the layered metal oxide is effectively improved, the layered metal oxide has larger specific surface area and pore diameter, but the pore volume is reduced, and the situation that growth of SWCNTs stops due to wall collision in the growth process is effectively avoided.

The invention discloses a wood-based composite phase-change material and a preparation method thereof, and belongs to the technical field of phase-change materials.The preparation method of the wood-based composite phase-change material comprises the following steps that wood is cut and then added into delignification liquid to be heated, the wood is taken out and washed with water, and delignified wood is obtained; the delignification wood is added into the modification liquid to be heated, and after being taken out, the delignification wood is washed and dried to obtain pretreated wood; mixing polyethylene glycol, citric acid and boric acid, heating and stirring to obtain a phase change material; dipping the pretreated wood into the phase change material for vacuum dipping, taking out and drying to obtain the phase change material. The modified liquid is prepared from an ethanol water solution, a modified filler, 2-(3, 4-cyclohexene oxide) ethyltrimethoxysilane and triethylamine. The delignification liquid and the modification liquid are adopted for pretreating the wood, so that the wood can be better firmly combined with the phase change material, leakage is prevented, and the finally prepared wood-based composite phase change material has excellent heat management capacity and stability.

The invention relates to the technical field of separation and purification, in particular to a purification method of eugenol, which comprises the following steps: (a) dissolving crude eugenol in an ethanol aqueous solution to prepare a solution with eugenol mass concentration of 20-30%; (b) adding a composite protective agent into the solution, uniformly stirring and standing to obtain a mixed solution, the composite protective agent comprising modified chitosan, sodium ascorbate and nano-silica; (c) carrying out reduced pressure evaporation on the mixed solution, and recovering the solvent to obtain a concentrated solution; (d) adding the concentrated solution into a glycine aqueous solution with the mass concentration of 1-2%, uniformly stirring and standing; and (e) carrying out segmented temperature control rectification on the concentrated solution treated in the step (d), and collecting a target fraction to obtain the high-purity eugenol. By introducing a novel protective agent system and a staged temperature control rectification technology, the occurrence rate of thermal decomposition and oxidation reaction is remarkably reduced, and the product purity and the production efficiency are improved.

The invention discloses a high-performance malachite green adsorbent as well as a preparation method and application thereof, and belongs to the technical field of preparation of malachite green adsorbents. The method comprises the following steps: with a carbon-based adsorbent as a raw material and an ethanol aqueous solution and a sodium hydroxide solution as modifiers, heating and stirring on a magnetic stirrer to form a turbid liquid; and further carrying out solid-liquid separation on the turbid liquid, washing a solid product with deionized water until the solid product is neutral, and drying. The prepared high-performance malachite green adsorbent is used for treating malachite green printing and dyeing wastewater, and compared with a carbon-based adsorbent raw material, the adsorption performance is effectively improved. The preparation method of the high-performance malachite green adsorbent is simple, rapid, low in energy consumption and good in environmental protection property.

The invention provides a preparation method and application of low-bath-ratio and high-viscosity hydroxypropyl carboxymethyl composite starch ether, and relates to the technical field of starch deep processing. The method comprises the following steps: S1, premixing corn starch with a compound base catalyst and magnesium stearate, and spraying an ethanol water solution for alkalization; s2, adding epoxypropane to carry out first-stage etherification, and then adding sodium chloroacetate to carry out second-stage etherification; and S3, after the reaction is finished, performing vacuum drying, crushing and sieving to obtain the high-viscosity hydroxypropyl carboxymethyl composite starch ether. Wherein the composite alkali catalyst comprises sodium hydroxide, sodium carbonate and calcium oxide. The starch ether obtained by the method has the advantages of high substitution degree, high viscosity, low solvent consumption and low energy consumption, and overcomes the defects of the traditional semi-dry method.

The invention discloses a preparation method of non-denatured II-type collagen for promoting bone and cartilage growth, and belongs to the technical field of II-type collagen extraction.The preparation method comprises the following steps that 1, pretreatment is conducted; (2) soaking in a salt solution: adding the salt solution into the cartilage particles for soaking treatment to obtain a precipitate; (3) soaking in an organic solvent; and (4) drying and crushing the solid matter to obtain the traditional Chinese medicine composition. The salt solution is prepared from the following components in percentage by mass: 1 to 5 percent of sodium chloride, 0.2 to 0.8 percent of lecithin, 0.3 to 1 percent of plant extract and the balance of water; the plant extract is a water extract of rhizoma kaempferiae, chicory and houttuynia cordata; the organic solvent is an ethanol water solution and pullulan polysaccharide. According to the method disclosed by the invention, the saline solution is improved, so that the structural stability of the collagen is improved while the dissolution of non-collagen components is promoted, the denaturation of the type II collagen is avoided, and the extraction efficiency of the non-denatured type II collagen is improved.

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.

This invention belongs to the field of membrane material preparation and modification technology, and relates to a method for pre-wetting the surface of a hydrophobic ceramic membrane. The ceramic membrane is immersed in a cyclohexane solution of perfluorooctyltrimethoxysilane for 3-4 hours. After immersion, the ceramic membrane is dried in an oven. An ethanol solution is forced to circulate through the ceramic membrane to pre-wet the separation layer. The pre-wetting process proposed in this invention is simple, highly controllable, and easily scaled up to pre-wet multi-channel hydrophobic ceramic membranes. This invention achieves coarse adjustment of the wetting degree by controlling the concentration of the ethanol-water solution, and further fine adjustment by combining the circulation time of the ethanol-water solution, thus achieving more precise control of the wetting degree and optimal improvement of the uniformity of the hydrophilic coating.

The present invention provides a VD furnace cover castable lining and a preparation method thereof, which belongs to the technical field of high-temperature refractory materials, comprising the steps of: mixing an emulsion of hydrogenated silicone oil, aminopropyltriethoxysilane, and pearl sand, heating and soaking, and drying to obtain modified pearl sand; mixing graphite, acetic acid, tetrabutyl titanate, and nano silicon powder, dropping an ethanol aqueous solution, adjusting the pH value to acidic, aging, drying, heating at a high temperature under an inert gas environment, and cooling to obtain TiC-Ti3SiC2 composite coating graphite; mixing brown corundum, silicon carbide, α-Al2O3 powder, calcium aluminate cement, TiC-Ti3SiC2 composite coating graphite, and modified pearl sand, drying, adding distilled water, stirring, putting into a mold, casting and molding, standing, taking out, drying, spraying silicon powder on the surface, and performing heat treatment under a nitrogen atmosphere to obtain a VD furnace cover castable lining. The present invention can improve the thermal insulation performance of the VD furnace cover while improving the thermal shock stability of the VD furnace cover castable lining.

The invention provides resistant dextrin as well as a preparation method and application thereof, and belongs to the technical field of preparation of resistant dextrin. The preparation method of the cassava starch resistant dextrin comprises the following steps: gelatinizing cassava starch, mixing the gelatinized cassava starch with pullulanase, carrying out debranching enzymolysis, mixing supernate with an ethanol water solution, washing precipitates with absolute ethyl alcohol, mixing the precipitates with water, recrystallizing at 45-55 DEG C, and collecting crystal substances, so as to obtain the cassava starch resistant dextrin. The cassava starch resistant dextrin with high purity and high resistant starch content can be prepared by taking cassava starch as a raw material and pullulanase as debranching enzyme and adopting a green preparation process of debranching, alcohol precipitation and recrystallization, and the resistant starch content in the prepared resistant dextrin is 50-70%. The preparation method is energy-saving and environment-friendly, and can be commercially applied. Theoretical guidance is provided for preparing the resistant dextrin based on a green process, and a basis is provided for improving the application of the resistant dextrin in the food industry.

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 traditional Chinese medicines, and particularly relates to double-orange granules and a preparation method thereof. The double-orange granules comprise the following raw materials: a volatile oil inclusion compound, dry paste powder, low-viscosity dextrin, powdered sugar and amber powder. The volatile oil clathrate compound is prepared by the following steps: adding water into beta-cyclodextrin, uniformly mixing, and then adding volatile oil for clathration, thereby obtaining the volatile oil clathrate compound. The mass ratio of the beta-cyclodextrin to the water is 1: (4-6), the mass ratio of the volatile oil to the beta-cyclodextrin is 1: (9-12), and the dry paste powder is prepared by adding the double-orange particle extract into low-viscosity dextrin and carrying out spray drying. The preparation method of the double-orange granules comprises the following steps: mixing all the raw materials, granulating by taking a 55-65% ethanol water solution as an adhesive, finishing the granules, drying, and finishing the granules again. According to the invention, by optimizing the variety and dosage of the auxiliary materials, the tower sticking phenomenon in spray drying can be obviously improved, and the yield of spray drying and the particle yield of wet granulation are improved.

The invention discloses a gradient alcohol extraction preparation method of compound honeysuckle flower drops for improving T cell activity, and relates to the technical field of traditional Chinese medicine compound preparations, honeysuckle flower and radix astragali are selected for pretreatment, an ethanol aqueous solution and an interaction regulating agent are added for infiltration, an online traditional Chinese medicine compound preparation HPLC is adopted for dynamic alcohol concentration adjustment and temperature extraction under monitoring of the traditional Chinese medicine compound preparation, the method disclosed by the invention has the advantages that the interaction regulating agent is added in the raw material infiltration stage to block bad interaction among active components, and the online monitoring system is utilized to dynamically adapt the ethanol concentration and the extraction temperature to realize step-by-step efficient dissolution of the multi-polar components; the antioxidant is matched to inhibit oxidation of thermosensitive components, and the solubilizer assists dissolution of insoluble components, so that the core defect that synergistic extraction of multi-polar active components, degradation of the thermosensitive components and interaction inhibition of the components in the compound honeysuckle flowers cannot be considered in the prior art is overcome, and loss or antagonism of the active components is effectively avoided.

The invention belongs to the technical field of colored glazed glass, and particularly relates to colored glazed glass and a preparation method thereof. The preparation method of the colored glazed glass comprises the following steps: (1) selecting a glass sheet, cleaning, cutting and edging for later use; (2) printing glaze on the outer surface of the glass treated in the step (1) by adopting a silk-screen printing process, and drying; (3) carrying out toughening treatment on the glass treated in the step (2); (4) soaking the glass treated in the step (3) in an ethanol water solution containing a silane coupling agent, washing and drying for later use; and (5) taking two pieces of glass treated in the step (4), coating the inner surfaces of the two pieces of glass with a sizing material, and curing to obtain the colored glaze glass. The adhesive film of the colored glazed glass has good adhesive property and mechanical property, prevents the glass from being broken and splashed, and can resist the erosion of the external environment, maintain the adhesive property and mechanical strength of the adhesive film and prolong the service life of the colored glazed glass.

The invention discloses a lipoic acid pharmaceutical composition and a preparation method thereof, the form of the pharmaceutical composition is wet particles, and the pharmaceutical composition comprises lipoic acid, hydroxy propyl cellulose and an ethanol aqueous solution; the preparation method comprises the following steps: adding an ethanol aqueous solution of hydroxy propyl cellulose into a lipoic acid-containing mixed material, carrying out wet granulation, and controlling the concentration of the ethanol aqueous solution to be 20-60%, the problems of sticking and cracking in the tabletting process are avoided, and process feasibility is achieved; moreover, the dosage of the ethanol aqueous solution of the hydroxy propyl cellulose is only 15-30% of the mass of the lipoic acid, so that the problem of difficult particle drying caused by excessive wetting is avoided, and industrial production is facilitated.

The invention relates to a preparation method of a brown glass bottle for glue storage, which is characterized by comprising the following steps: (1) carrying out acid treatment on the inner surface of the glass bottle, adding a Tris-HCl solution with the pH value of 8-9 and 50-100g of dopamine into the bottle, stirring, mixing, washing and drying to obtain the glass bottle with the inner surface grafted with black polydopamine; (2) activating the surfaces of the nano inorganic particles, adding 20-30 drops of a silane coupling agent into an ethanol water solution to carry out hydrolysis reaction, then adding 50-100g of the surface-activated nano inorganic particles, stirring, washing and drying to obtain the nano inorganic particles grafted with the silane coupling agent; and (3) preparing an acid / alkali solution of which the pH value is greater than 4 in the glass bottle of which the inner surface is grafted with the black polydopamine, adding 10-50g of the nano inorganic particles grafted with the silane coupling agent, stirring for reaction, washing, and drying to obtain the black glass bottle of which the surface is deposited with the nano inorganic particles. The preparation method has the advantages that the preparation method is simple and convenient to operate; the glue storage bottle capable of keeping away from light and controlling metal ion precipitation can be manufactured.

The invention relates to the technical field of skin care product raw materials, and particularly discloses a soothing anti-inflammatory composition as well as a preparation method and application thereof. The preparation method of the soothing anti-inflammatory composition comprises the following steps: step 1) mixing saffron crocus, radix sophorae flavescentis, houttuynia cordata, moringa seeds and astragalus membranaceus to obtain a composite raw material; the invention discloses a soothing and anti-inflammatory composition and a preparation method thereof.The soothing and anti-inflammatory composition and the preparation method thereof.The soothing and anti-inflammatory composition has the advantages that soothing, anti-inflammatory and skin barrier repairing effects are further improved.

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 belongs to the technical field of catalyst preparation, and particularly relates to a method for synthesizing a fly ash-based hierarchical porous ZnY / Si-Beta catalyst by adopting a solvent-free method and application of the fly ash-based hierarchical porous ZnY / Si-Beta catalyst. According to the invention, fly ash is taken as a raw material, the ZnY / Si-Beta catalyst is synthesized by adopting a solvent-free method to catalyze direct conversion of an ethanol aqueous solution to prepare butadiene, so that resource utilization of fly ash can be realized, the influence of water on the active center of the catalyst can be inhibited, and efficient conversion of the ethanol aqueous solution to prepare butadiene is realized.

This invention discloses a flavoring microcapsule for heated tobacco products, its preparation method, and its application, belonging to the field of heated tobacco technology. The preparation method includes the following steps: dissolving zein in an aqueous ethanol solution to obtain a zein solution; dissolving chitosan in an aqueous acetic acid solution to obtain a chitosan solution; then adding heterocyclic flavorings, polyvinyl alcohol, and antioxidants to the chitosan solution and mixing to obtain a flavoring solution; mixing and stirring the zein solution and flavoring solution evenly; then emulsifying under cold conditions and freeze-drying to obtain the flavoring microcapsule for heated tobacco products. The preparation method of this invention can obtain heterocyclic flavoring microcapsules with good morphology, high heterocyclic flavoring encapsulation rate, and high flavor loading capacity. When used in heated tobacco products, these microcapsules exhibit a suitable sustained-release rate, long-lasting aroma, and good consistency in each puff; moreover, the preparation method is simple, safe, and environmentally friendly.

The invention discloses a humulus lupulus extract with anti-inflammatory, bacteriostatic, soothing and skin barrier repairing effects and a preparation process thereof, and relates to the technical field of cosmetic raw materials. The preparation process of the humulus lupulus extract comprises the following steps: mixing humulus lupulus and an ethanol water solution, performing hot reflux extraction for 1-3 times, performing vacuum concentration on an extracting solution, and drying to obtain a crude humulus lupulus extract; and dissolving the crude humulus lupulus extract with water to obtain a solution, performing column chromatography separation with AB-8 resin, performing elution with water and an ethanol aqueous solution, collecting an eluent, performing vacuum concentration on the eluent, and drying to obtain the humulus lupulus extract. In the preparation process, the effect of high content of total flavonoids can be achieved by only adopting one-time column chromatography separation. Under the optimal preparation process conditions, the anti-inflammatory, bacteriostatic, soothing and skin barrier repairing effects of the humulus lupulus extract are verified, and it is indicated that the humulus lupulus extract has the bacteriostatic, anti-inflammatory, soothing and repairing effects and can be applied to skin care products.

The invention discloses a method for increasing caffeine content and crude fat content in coffee extract liquor through combination of subcritical water extraction and ethanol. The method comprises the following steps: mixing coffee bean powder with an ethanol water solution, sequentially carrying out programmed heating, staged pressure and temperature control subcritical water extraction, cooling, carrying out solid-liquid separation, and carrying out reduced pressure distillation on filtrate to recover ethanol, thereby finally obtaining the coffee extract. Through ethanol concentration regulation and control in combination with staged temperature control, the content of crude fat is increased to be greater than or equal to 12mg / g while the content of caffeine is greater than or equal to 18mg / g. According to the method, the defect of low crude fat content in traditional subcritical extraction is overcome through the synergistic effect of polarity adjustment of ethanol and subcritical water, and efficient enrichment of two components is realized.

The invention discloses an iron-cobalt spinel oxide, which is prepared by the following steps: with ferric salt and cobalt salt as raw materials, dissolving the ferric salt, the cobalt salt and sodium acetate in an ethanol aqueous solution to obtain a precursor solution, carrying out hydrothermal treatment on the precursor solution, and washing and drying a reaction product to obtain the iron-cobalt spinel oxide. The iron-cobalt spinel type oxide is stable in crystal structure, the leaching rate of metal ions is remarkably reduced due to existence of metal-oxygen bonds, the recycling rate is increased, and meanwhile the risk of secondary pollution of water is reduced. In the process of degrading nitrogen-containing organic wastewater by an advanced oxidation technology for generating sulfate free radicals based on peroxymonosulfate, the iron-cobalt spinel type oxide has good catalytic performance, and can basically complete degradation of multi-nitrogen organic pollutants in water; and the method has relatively strong capability of resisting interference of inorganic ions and organic matters, and has relatively great application potential in actual wastewater treatment. The invention also discloses a method for degrading the multi-nitrogen explosive wastewater by using the ferrocobalt spinel type oxide.

The invention provides a process for purifying silicon carbide ultrafine powder for semiconductors, which belongs to the technical field of semiconductor materials and comprises the following steps: carbonizing treated wood in flowing argon to form a carbon template; heating and stirring tetraethoxysilane, an ethanol water solution and oxalic acid, infiltrating the carbon template into the mixture, calcining under argon protection, carrying out vacuum heat treatment, and carrying out ball milling to obtain silicon carbide powder; the preparation method comprises the following steps: adding silicon carbide powder into water, mixing and stirring, adding polyethyleneimine and edible fatty acid base oil, stirring, separating, drying, putting into a NaOH solution, reacting at 50-80 DEG C, washing, drying, exposing in steam of a hydrofluoric acid-hydrochloric acid-nitric acid mixture, reacting, washing and drying to obtain the silicon carbide superfine powder. The method can reduce the production cost of silicon carbide and improve the purity of silicon carbide.

The invention discloses a mulberry leaf fermentation extract as well as a preparation method and application thereof, and belongs to the technical field of fermentation extract preparation. The preparation method of the mulberry leaf fermentation extract comprises the following steps: S1, mincing dry mulberry leaves, putting the minced mulberry leaves into an ethanol water solution, carrying out ultrasonic extraction, and distilling; adding distilled water to a constant volume, adjusting pH, and sterilizing at high temperature to obtain mulberry leaf feed liquid; s2, firstly inoculating fungi into the mulberry leaf feed liquid, performing liquid fermentation treatment for 2-3 days, then inoculating lactobacillus plantarum and pediococcus pentosaceus, performing liquid fermentation treatment for 4-5 days to obtain a fermentation product, centrifuging the fermentation product, taking supernatant filtrate, and drying to obtain the mulberry leaf fermentation extract. Comprising the following active components: 1-deoxynojirimycin (DNJ) and flavone, the content of 1-deoxynojirimycin is greater than 1.2%, and the content of flavone is greater than 1%; the bitter taste is greatly reduced, and the product can be applied to hypoglycemic food.

The invention relates to the technical field of extraction of effective active ingredients of plants, and provides a method for extracting and purifying high-content tea pigment, which comprises the following steps: weighing a tea leaf raw material, extracting by adopting a hot reflux extraction mode, adding an ethanol water solution with the volume fraction of 0-50%, and extracting at the temperature of 60-100 DEG C; filtering the extracting solution, adjusting the pH value of the extracting solution to 9-11, concentrating under reduced pressure, adding ethanol into the concentrated solution until the alcohol content is 40% v / v-70% v / v, carrying out alcohol precipitation, dissolving and crystallizing the precipitate after the alcohol precipitation, and collecting the supernate; and adsorbing and eluting the obtained supernatant by using a resin filler, collecting the eluent, concentrating and drying to obtain a tea pigment product with the tea pigment content of more than or equal to 80%. The prepared tea is high in pigment content and yield, good in quality, simple in step and suitable for large-scale production.