34results about How to "Catalytic time is short" patented technology

The invention discloses a preparation method of a WO3 / C3N4 mixed photocatalyst. The preparation method comprises the following steps: taking sodium tungstate and sodium chloride as the raw materials, preparing WO3 through a hydrothermal method, subjecting the WO3 to an ultrasonic dispersion treatment to obtain processed WO3; taking urea as the raw material, burning urea to obtain C3N4 in one step, subjecting C3N4 to an ultrasonic dispersion treatment to obtain processed C3N4; mixing the processed WO3 nano powder and processed C3N4 by a mechanical means and ultrasonic waves in sequence, washing the mixture, subjecting the mixture to a centrifugal treatment, and finally drying the mixture at a temperature of 70 to 80 DEG C to obtain the WO3 / C3N4 composite photocatalyst. Under the same conditions, the catalytic degradation rate of rhodamine B of the provided photocatalyst is increased by 8%, compared with that of a conventional WO3 / C3N4 composite photocatalyst, which is prepared through a grinding method; moreover, the catalytic time is shorter, and one hour after the starting of the catalytic reactions, the catalytic degradation rate of rhodamine B can reach 99%.

The invention discloses a trehalose synthetase as well as encoding genes and application thereof. The trehalose synthetase is a protein comprising one of the following amino acid residue sequences: 1) an SEQ ID No. 1 amino acid residue sequence in a sequence table; and 2) a protein which is derived from the SEQ ID No. 1, has trehalose synthetase related functions, and is obtained by replacing and / or deleting and / or adding the SEQ ID No. 1 amino acid residue sequence in the sequence table. Trehalose can be obtained by using maltose as a substrate and performing catalysis with the application of the protein of the trehalose synthetase; besides, the catalytic reaction has the advantages that the catalysis time is short, the concentration of the required substrate is low, a 90mM maltose is used as the substrate, the catalysis time is 8 hours, and the conversion rate reaches 69 percent.

The invention discloses a ferrous-base metal organic framework material, a normal-pressure synthesis method thereof and a method of catalytically activating persulfate to treat organic pollutants. Themethod includes: successfully synthesizing a heterogeneous catalyst high-proportion ferrous-base metal organic framework material (Fe(II)-MOFs); utilizing the characteristic that the metal organic framework is high in active site and catalytic activity to catalytically activate sulfate at normal temperature to generate sulfate radical to degrade persistent organic pollutants. The catalyst is easyto be recycled, still has good activating effect after being reutilized for several times and is an environment-friendly material. The method is suitable for various persistent organic pollutants, high in durability, short in catalysis time, convenient in operation, capable of having good degradation effect within a wide pH value range and great in application prospect of degrading the persistentorganic pollutants.

The invention provides a jeans garment shaping liquid as well as a preparation method and an application thereof in an ultraviolet light photocatalytic shaping and finishing method and relates to a jeans garment shaping liquid. The jeans garment shaping liquid comprises the following components in percentage by weight: 5.0-15.0 percent of polycarboxylic acid, 3.0-9.0 percent of sodium hypophosphite, 0.1-2.0 percent of Fe<3+>doped nanometer titanium dioxide, 1.0-5.0 percent of penetrating agents, 2.0-5.0 percent of formaldehyde-free environmentally-friendly stiffening agents, 3.0-5.0 percent of smooth brighteners and 59.0-85.9 percent of water. The invention also relates to the jeans garment ultraviolet light photocatalytic shaping and finishing method by adopting the shaping liquid, which comprises the following steps of: carrying out plasma radiation treatment on a part of a jeans garment required to be shaped, spraying the shaping liquid onto the treated part of the jeans garment, pre-drying on a drying tunnel-type drying oven and crinkling the treated part of the jeans garment; then carrying out photocatalytic shaping on the treated parts; and finally washing and drying. The method is high in catalytic efficiency, is environmental-friendly and energy-saving and is high in production efficiency. The finished jeans garment is durable, is good in shaping effect and good in handfeel and gloss, is environmental-friendly and generates no formaldehyde emission.

The invention discloses a photo-anode for slowing down corrosion in a photoelectrocatalysis wastewater treatment process by using amorphous cobalt phosphate Co-Pi, a preparation method and applicationthereof. The method comprises the following steps: depositing a Bi metal film on the surface of a fluorine-doped tin oxide substrate under a dark condition; and dropwise adding a solution of vanadylacetylacetonate, annealing, converting the Bi metal film into a BiVO4 substrate film, soaking the BiVO4 substrate film in an electrolyte solution containing a chelating agent, applying a constant potential to obtain an electrode film, and electrodepositing cobalt phosphate to obtain the photo-anode. According to the method, an electrode film material is synthesized through simple photo-assisted electro-deposition, rapid capture and release of holes are completed in the process of photoelectrocatalytic degradation of organic micro-pollutants in water by utilizing the cyclic process of the valence state of a cobalt element in CoPi, and self-oxidation corrosion of an internal BiVO4 / Cu2O photoelectrode is inhibited. The electrode film is easy to recycle, the crystal structure of the material is not changed after degradation experiments, and the electrode film is an environment-friendly material.

The invention discloses a cobalt sulfide loaded biochar catalyst, a preparation method and application thereof, and belongs to the field of environmental pollution treatment. The preparation method of the catalyst comprises the following steps: firstly adding a biomass material and cobalt nitrate hexahydrate into a mixed aqueous solution of hydrochloric acid and ethanol, then adding thiourea, after the reaction is finished, carrying out hydrothermal reaction to obtain pre-pyrolyzed cobalt sulfide-doped biomass powder, and pyrolyzing to obtain the cobalt sulfide-loaded charcoal catalyst. According to the invention, the catalyst and peroxymonopotassium sulfate salt are added into a water body containing organic pollutants, so that the degradation of the organic pollutants in the water body can be realized; and the catalyst is wide in applicable pH range, high in organic matter removal efficiency, simple in preparation method, high in operability, good in durability, short in catalysis time and wide in application prospect.

The invention discloses an electric-enhanced zero-valent-iron anaerobic water treatment device. The device comprises an up-flow anaerobic bioreactor, wherein an electric enhanced zero-valent-iron system is arranged in the middle of a barrel of the up-flow anaerobic bioreactor; the electric enhanced zero-valent-iron system comprises 2N electrodes formed by anodes and cathodes which are periodicallyarranged at intervals in the axial direction, wherein N is a positive integer; the anodes and the cathodes are connected with a direct-current power source outside the barrel through wires; and the space between every two adjacent electrodes are filled with a zero-valent-iron layer. According to the invention, on the basis of a zero-valent-iron coupling anaerobic reactor, a plurality of series orparallel electrodes are added, so that the over potential of a reaction is reduced, the electron obtaining rate of cathode microorganisms is accelerated, and the reduction reaction is promoted to berapidly carried out. An electric field is added, so that activity of the microorganisms can be stimulated, electron transfer between the electrodes and the microorganisms on the surface of the electrodes is facilitated, and the reaction rate of anaerobic zero-valent iron is enhanced to a greater extent.

The invention relates to a Bi / beta-Bi2O3 heterojunction material as well as a sodium gluconate-assisted synthesis method and application thereof, wherein the method comprises the steps: firstly, dissolving sodium gluconate in water, then adding a PEG4000 aqueous solution, adding a Bi(NO3)3 aqueous solution, mixing with formamide, and preparing a precursor material through a hydrothermal method; and further carrying out heat treatment in a nitrogen atmosphere to obtain the Bi / beta-Bi2O3 photocatalyst material. The Bi / beta-Bi2O3 heterojunction prepared by the preparation method disclosed by the invention is of a nest-shaped graded micro-nano structure and has excellent photocatalytic performance; and the Bi / beta-Bi2O3 heterojunction material has high photocatalytic degradation activity on rhodamine B and levofloxacin hydrochloride, and still has a high degradation rate after a cyclic photocatalytic reaction.

The invention discloses an engineering bacterium for efficiently synthesizing pyruvic acid and D-alanine and a construction method and application of the engineering bacterium. On the basis of a genetic engineering strain BLK07 (pET20b-pm1), a strain with improved enzyme activity of pm1 is screened out through site-saturation mutagenesis, and an N-terminal encoding sequence (NCS) is inserted intoan N terminal of a gene sequence of the pm1, so that the protein expression quantity of the pm1 is improved, the yield of the pyruvic acid is increased, the catalytic time is significantly shortened and the catalytic efficiency is improved. When the concentration of substrates D-alanine and L-alanine is 110 g / L, the cell concentration is 4 g / L and a catalyst system only carries out catalysis at 37DEG C and 220 rpm in a shake flask for 8 h, the yield of the pyruvic acid can reach a maximum value 46.5 g / L, the conversion rate of the L-alanine is 84.5% and the resolution rate of the D / L-alaninereaches 84.5%.

The invention discloses a preparation method of alkyl polyglycoside by using sulphonating graphene as a catalyst, and mainly aims to solve the technical problems of incomplete transformation and highproduction cost existing in a conventional synthesis method. The preparation method comprises the following steps of performing diazotization modification on sulfanilic acid, enabling the sulfanilic acid after the diazotization modification to react with active hydroxyls and epoxy groups on the surface of oxidized graphene to obtain an oxidized graphene loaded benzene sulfonic acid catalyst, enabling glucose and fatty alcohol to be mixed and dissolve, and by using the sulphonating graphene as the catalyst, performing one-step glycosidation so as to obtain the alkyl polyglycoside.

A method of preparing xylitol by utilization of winter bamboo shoot shells is disclosed. The method includes: hydrolyzing the raw material winter bamboo shoot shells with sulfuric acid, neutralizing the obtained hydrolysate with CaCO3 emulsion to obtain a sugar solution, concentrating the sugar solution, decolorizing the sugar solution with activated carbon, purifying the sugar solution further by ion exchange, performing a hydrogenation reaction, concentrating the obtained hydrogenated sugar solution, crystallizing, separating to obtain a product that is the xylitol, and recovering the mother liquor. The method adopts the winter bamboo shoot shells as the raw material to prepare the xylitol and is simple in process, efficient and low in cost.

The invention discloses a plant superoxide dismutase oxygen enrichment catalysis large scale producing method. It includes the following steps: selecting plant seed; removing impurity; sterilizing; oxygen enrichment pre-catalyzing; catalyzing; homogenization treatment and control pH at 7-8; dehydrating and collecting feed liquid; filtering and drying. Its advantages are that it can improve superoxide dismutase yield, increase its recovery by 30-50% compared with the existing method; it has simple technology, low cost, and wide material adaptability; it can used in large scale production.

The objective of the invention is to provide a novel synthetic method for Cilengitide by using thioesterase (TE); i.e., a TE-mediated chemoenzymic method is utilized for catalyzed synthesis of the antineoplastic compound Cilengitide, and the method enables efficiency to be improved and synthesis cost to be reduced. Compared with a traditional chemical synthetic method, the synthetic method provided by the invention has the following advantages: catalysis time is decreased by 48 times, a decrease from original 32 h (need by the chemical synthetic method) to 40 min, and yield is increased to 79.3% compared with original 27.2%; thus, the synthetic method enables synthesis efficiency of Cilengitide to be greatly increased and synthesis cost to be greatly reduced.

The invention discloses a method for preparing ginsenoside Rg3 through irradiation, belonging to the technical field of medicine preparation. The method comprises the following steps: with panaxadiolsaponins as a raw material, pretreating the panaxadiol saponins with an ethanol aqueous solution of an inorganic acid, then adding an irradiation auxiliary agent, and irradiating the panaxadiol saponins with energy of 1-15 kGy at normal temperature by virtue of a <60>Co-gamma ray irradiation technology; and carrying out purifying with an adsorption column to obtain the target product ginsenoside Rg3. According to the method, high-energy rays are adopted for strengthening acid selective hydrolysis, and the yield of ginsenoside Rg3 prepared through irradiation is greatly increased compared withthe yield of ginsenoside Rg3 obtained through common acid hydrolysis; catalytic time is shorter; the usage amount of acid is obviously reduced; and the output and yield of the target ginsenoside Rg3 are effectively increased. It is guaranteed that the preparation method is easy to operate, low in cost and high in efficiency.

The invention provides a preparation method of a perfume 6-methyl-3-heptene-2-one. The method mainly comprises the following steps: dissolving a major catalyst and a cocatalyst, adding a solvent, adding acetone, and adding isovaleraldehyde in a dropwise manner. The overall yield of the above product is high, and the total yield of two compounds 6-methyl-3-heptene-2-one and 6-methyl-4-heptanol-2-one is 95.4-96.41%; the content of 6-methyl-3-heptene-2-one is 94.27-96.41%; the content of 6-methyl-4-heptanol-2-one is 1.00-3.00%; the content of 6-methyl-3-heptene-2-one obtained after rectification reaches 99.10% or above; the raw material conversion rate is high, and the isovaleraldehyde conversion rate is 99.10-99.40%; the catalysis time is short and is 3.5-4.5h; and the solvent adopts cyclohexane, n-hexane and other alkane solvents, so the solvent can be easily obtained by factories, so environmental protection is facilitated, and the cost is reduced.

The invention discloses a preparation method of energy-saving anti-ultraviolet polytrimethylene terephthalate. The preparation method is characterized by comprising the following steps: a first-stageesterification reaction: adding purified terephthalic acid, propylene glycol, an auxiliary agent containing a stabilizer and a titanium catalyst loaded with metal ions, and a titanium compound selected from at least one of nano titanium nitride, nano titanium oxide and nano zinc titanate into a polymerization kettle; replacing air in the polymerization kettle with inert gas, controlling the pressure in the polymerization kettle to be 0.1-0.4 MPa, controlling the rotating speed of the stirrer to be 50-120 r / min, controlling the temperature in the polymerization kettle to be 120-230 DEG C, calculating the esterification efficiency according to the water yield, and ending the esterification reaction when the conversion rate of terephthalic acid reaches 90-100%. The polytrimethylene terephthalate prepared by the method has excellent energy-saving and anti-ultraviolet properties, and also has the advantages of being not easy to degrade and good in color and luster.

The invention provides a jeans garment shaping liquid as well as a preparation method and an application thereof in an ultraviolet light photocatalytic shaping and finishing method and relates to a jeans garment shaping liquid. The jeans garment shaping liquid comprises the following components in percentage by weight: 5.0-15.0 percent of polycarboxylic acid, 3.0-9.0 percent of sodium hypophosphite, 0.1-2.0 percent of Fe<3+>doped nanometer titanium dioxide, 1.0-5.0 percent of penetrating agents, 2.0-5.0 percent of formaldehyde-free environmentally-friendly stiffening agents, 3.0-5.0 percent of smooth brighteners and 59.0-85.9 percent of water. The invention also relates to the jeans garment ultraviolet light photocatalytic shaping and finishing method by adopting the shaping liquid, which comprises the following steps of: carrying out plasma radiation treatment on a part of a jeans garment required to be shaped, spraying the shaping liquid onto the treated part of the jeans garment, pre-drying on a drying tunnel-type drying oven and crinkling the treated part of the jeans garment; then carrying out photocatalytic shaping on the treated parts; and finally washing and drying. The method is high in catalytic efficiency, is environmental-friendly and energy-saving and is high in production efficiency. The finished jeans garment is durable, is good in shaping effect and good in handfeel and gloss, is environmental-friendly and generates no formaldehyde emission.

The invention relates to a temperature-sensitive hairy polymer microsphere immobilized with L-proline. According to the preparation method, a P(EGDMA-co-HEMA) polymer microsphere is used as a core, atrithioester-based RAFT reagent is grafted, a polymer chain formed by copolymerizing NIPAM, N-boc-L-PolyA and MMA as monomers through a surface-initiated RAFT polymerization method to serve as a hairpart, and tert-butyloxycarboryl protection on the N-boc-L-PolyA is removed to obtain the polymer microsphere. According to the present invention, the L-proline immobilization amount on the temperature-sensitive polymer microsphere is large, the good catalysis effect is provided in direct catalysis of an asymmetric Aldol reaction in an aqueous phase environment, the catalysis reaction time is short, and the polymer microsphere can be separated from the catalysis system through simple centrifugal separation.

The present invention discloses a 7-aminocephalosporanic acid preparation method, and in particular relates to a one-step enzymatic method 7-aminocephalosporanic acid preparation method by use of immobilized cephalosporin C acylase to catalyze cephalosporin C. The method is as follows: the immobilized cephalosporin C acylase and the cephalosporin C are mixed in a liquid, and in a reaction cycle reaction system temperature is continuously or discontinuously raised from initial reaction temperature to 16-37 DEG C. The method has the advantages of stable catalytic rate, shorter reaction time and multiple batches of use of the immobilized cephalosporin C acylase.

The invention relates to a preparation method of an ultraviolet wideband photocatalyst and belongs to the field of preparation of photocatalysts. Aiming at the problems of a TiO2 photocatalyst, which is prepared at present, that the forbidden band width is relatively large, only an ultraviolet light part occupying 3%-5% of a solar light spectrum can be responded, the utilization rate of solar energy is not high and the photocatalytic effect cannot be sufficiently expressed, the invention provides the preparation method which comprises the following steps: mixing styrene and salicylic acid to prepare salicylate resin; and dispersing and mixing nano titanium dioxide and salicylate to prepare the photocatalyst. Ultraviolet light is absorbed through the salicylate and molecular rearrangement is carried out under the illumination of the ultraviolet light, so that the ultraviolet light absorption effect is realized. The ultraviolet absorption wavelength of the prepared ultraviolet wideband photocatalyst can reach 350nm-380nm, the catalysis efficiency is high, the catalysis time is reduced by 30%-45%, and the de-coloring rate reaches more than 93%; and the ultraviolet wideband photocatalyst is prepared from the salicylic acid and tetrabutyl titanate, is simple to operate and is green and environment-friendly.

The invention provides a preparation method of a perfume 6-methyl-3-heptene-2-one. The method mainly comprises the following steps: dissolving a major catalyst and a cocatalyst, adding a solvent, adding acetone, and adding isovaleraldehyde in a dropwise manner. The overall yield of the above product is high, and the total yield of two compounds 6-methyl-3-heptene-2-one and 6-methyl-4-heptanol-2-one is 95.4-96.41%; the content of 6-methyl-3-heptene-2-one is 94.27-96.41%; the content of 6-methyl-4-heptanol-2-one is 1.00-3.00%; the content of 6-methyl-3-heptene-2-one obtained after rectification reaches 99.10% or above; the raw material conversion rate is high, and the isovaleraldehyde conversion rate is 99.10-99.40%; the catalysis time is short and is 3.5-4.5h; and the solvent adopts cyclohexane, n-hexane and other alkane solvents, so the solvent can be easily obtained by factories, so environmental protection is facilitated, and the cost is reduced.

The invention discloses a molecularly imprinted polymer for targeted degradation of emerging pollutants based on an advanced oxidation system as well as a preparation method and application of the molecularly imprinted polymer. The preparation method comprises the following steps: adding emerging pollutants and acrylic acid into a pore-forming agent, pre-assembling, adding MOFs, divinyl benzene and azodiisobutyronitrile under a protective atmosphere, and carrying out a water bath reaction; and centrifugally separating, washing and drying the reacted mixture to obtain the molecularly imprinted polymer. The molecularly imprinted polymer disclosed by the invention can be continuously used, still has good adsorption and activation effects after being used for multiple times, and is an environment-friendly material. The method is suitable for various emerging pollutants, is good in durability, short in catalysis time and convenient to operate, has a relatively high degradation effect on the pollutants, reduces the pollutant degradation cost, and has a great application prospect in the aspect of degrading the emerging pollutants.

The invention relates to a method of preparing levulinic acid via hemicellulose. The method comprises the steps of screening hemicellulose which is 200-400 mesh, preparing hemicellulose liquid havinga concentration of 15-25% with a dual-water-phase solvent, adding the prepared hemicellulose liquid into a reactor, adding 5-10% of a mixed solution of formic acid, acetic acid and iron chloride, 1-5%of a tin porous carbon-based solid acid catalyst, 0.5-1.0% of Raney nickel-alumina-ZSM5 catalyst, and 0.3-0.8% of Au-ZrO2-SBA15 catalyst, stirring while temperatures are controlled in different periods of time, introducing hydrogen for a period of time, holding the set temperature for a period of time, and preparing to obtain levulinic acid solution. few byproducts occur to the preparation of levulinic acid; subsequent separation and purification are simple; the yield of levulinic acid is increased; one-step preparation of levulinic acid by hemicellulose is achieved.

The invention relates to the technical field of catalysts, in particular to a heteropolyacid salt solid catalyst and its preparation method and application. The invention discloses a heteropolyacid solid catalyst, comprising: a heteropolyacid and M supported on the heteropolyacid 1 , the preparation method of the catalyst is simple, the catalyst has good catalytic performance, the yield of the prepared methyl lactate is high, the catalytic reaction conditions are mild, easy to recycle, high in reutilization rate and good in stability, the catalytic time is short, and it has a good industrial application prospect , to solve the problem that when the existing catalysts catalyze the production of methyl lactate from biomass resources, the biomass resources are relatively simple monosaccharides or oligosaccharides, and the catalytic performance is poor. No catalyst can better catalyze polysaccharides such as cellulose Technical problems related to catalysts for the production of lactate methyl esters.

The invention discloses a copper-manganese-doped iron metal organic framework material, a preparation method thereof, and a method for catalyzing and activating persulfate for treating organic wastewater, belonging to the technical field of water pollution control. In the present invention, diaminoterephthalic acid, iron salt, copper salt and manganese salt are added to N-dimethylformamide to obtain a mixed solution, then methanol and hydrofluoric acid are added for heating reaction; after the obtained reacted mixture is cooled, Centrifugal separation, washing and drying, the obtained powder is the copper-manganese-doped iron metal organic framework material. The catalyst of the invention has high catalytic activity, short catalytic time, good durability, convenient operation, and can have high degradation effect in a wide pH value range, and the activation effect is still very good after repeated utilization. Iron-copper bimetallic organic framework materials have higher catalytic efficiency and higher stability, and are more environmentally friendly materials, which have great application prospects in the degradation of organic pollutants in water.

The invention relates to a metal / titanic dioxide catalyst used for catalytic oxidation and a preparation method thereof. The method is mainly characterized in that: the salt of metal source is dissolved in glycol and added with a stabilizer and a structural directing molecule after being mixed with the solution of titanium source, thus acquiring a mixed solution; the solution is radiated to be evenly distributed by ultrasound and certain energy is used for radiating the solution; in the conditions of radiation and refluence, the mixed solution is stirred and added with an alkali liquor and continuously to be stirred after the adding of the alkali liquor is finished; the solution is taken out, cooled, filtered, washed and dried, thus obtaining the catalyst which consists of metal and titanic dioxide; and a molar ratio of the metal and the titanic dioxide is 0.05: 1-10: 1. The catalyst has the advantages of simple preparation and convenient operation, active components which are not easily lost, wide applicable pH range, and high catalytic activation, etc., thus being a good catalyst in certain advanced catalytic oxidation processes and has good performance by the test of samples.