50results about How to "Regulation content" patented technology

The invention discloses a photonic crystal hydrogel membrane with pH value and ionic strength response, a preparation method and an application thereof. The photonic crystal hydrogel membrane comprises Fe3O4 nano particles and polyacrylamide-methacrylate acetic acid hydrogel, wherein the Fe3O4 nano particles are uniformly dispersed in the hydrogel and are arranged in a one-dimensional chain shape, and the concentration of the nano particles in the membrane is 1 to 50 mg / mL. The preparation method of the photonic crystal hydrogel membrane comprises the steps of uniformly mixing the Fe3O4 nano particles and hydrogel monomers, so as to generate curing reaction through ultraviolet light, and soaking in a soluble carbonate aqueous solution at last, so as to obtain the required membrane. The preparation method has the advantages of simplicity in operation, strong repeatability and convenience in large-scale preparation, the carboxyl quantity of the obtained membrane is controllable, the membrane is monochromatic, obvious color change occurs under the stimulation of pH value or ionic strength, and naked-eye detection is facilitated.

The invention discloses quasi-TC4 titanium alloy for laser additive manufacturing application. The quasi-TC4 titanium alloy for laser additive manufacturing application comprises, by mass percentage,1%-2% of Mo, 5.5%-6.8% of Al, 3.5%-4.5% of V and the balance Ti and inevitable impurities. The quasi-TC4 titanium alloy is obtained in the mode that dried pre-alloyed powder or dried element mixed powder of the quasi-TC4 titanium alloy are manufactured according to a laser additive manufacturing method. The Mo is added to the quasi-TC4 titanium alloy, the synergistic effects that intracrystallinealpha battens are thinned, and the alpha-phase volume fraction is increased are effectively achieved under the action of the heat cycle of laser additive manufacturing, and the strength and the plasticity of the quasi-TC4 titanium alloy are improved. According to the quasi-TC4 titanium alloy for laser additive manufacturing application, the manufacturing technology is simple, the operation response is fast, machining is easy, crucibles or other electrode materials are not required in the manufacturing process, and alloy elements are prevented from being contaminated.

The invention discloses a regulation and preparation method of a LPSO phase in an Mg-Gd-Er-Zn-Zr alloy, and belongs to the technical field of heat treatment. The Mg-Gd-Er-Zn-Zr alloy is heated up to the medium temperature of 300-350 DEG C in a heat treatment furnace; the temperature is kept for 15-60 minutes; the quenching is performed by hot water of 70 DEG C; then, the Mg-Gd-Er-Zn-Zr alloy is heated up to the high temperature of 480-520 DEG C; the temperature is kept for 3-8 hours; the quenching is performed by the hot water of 70 DEG C; and finally, the Mg-Gd-Er-Zn-Zr alloy is heated up to the secondary-high temperature of 400-460 DEG C; the temperature is kept for 12-50 hours; and the quenching is performed by the hot water of 70 DEG C. The method not only can control the volume fraction and one-dimensional dimension of the LPSO phase in the alloy, but also can effectively eliminate the component segregation of the casting alloy. Through the control process, the volume fraction of the LPSO phase is 3.2-45.67%, the range of the one-dimensional dimension is 25-120 microns, the component segregation and thick primary tissues of the casting alloy can be obviously eliminated, and the mechanical performance of the alloy is obviously improved.

The invention relates to a preparation method of a linear-chain C5 / C6 alkane catalyst prepared by sorbitol aqueous phase hydrogenation. The method comprises the following steps: (1) selecting activated carbon as a catalyst carrier, and drying at the temperature of 100-200 DEG C; (2) adding the dried activated carbon into an ammonium paramolybdate aqueous solution, and drying to obtain a catalyst carrier precursor containing molybdenum; (3) calcining the catalyst carrier precursor containing molybdenum in a muffle furnace to obtain a catalyst carrier containing molybdenum; (4) adding a ruthenium trichloride solution into the catalyst carrier for soaking, and drying to obtain a catalyst carrier precursor containing ruthenium and molybdenum; (5) calcining the catalyst carrier precursor containing ruthenium and molybdenum to obtain an initial catalyst; and (6) performing hydrogen gas reduction on the initial catalyst at the temperature of 250-400 DEG C for 4-8h to obtain the sorbitol aqueous phase hydrogenation catalyst. According to the method, a step soaking method is adopted to inhibit carbon-carbon bond breakage and selectively break carbon-oxygen bonds, so that the selectivity and the excitation capacity of sorbitol hydrodeoxygenation reaction can be improved.

The invention belongs to the technical field of nano composite preparation and relates to a nano iron-carbon composite powder preparation method. The nano iron-carbon composite powder preparation method is characterized by including the steps: taking ferric nitrate as an iron source, taking water-soluble organics as a carbon source, and preparing the ferric nitrate, the carbon source and a reducing agent into homogeneous aqueous solution; heating the solution to enable volatilization, concentration and decomposition of the solution to obtain a precursor; calcining in a reducing atmosphere to obtain nano iron-carbon composite powder, wherein metal iron particles of the nano iron-carbon composite powder are uniform and adjustable in size distribution, iron / carbon phases of the nano iron-carbon composite powder are uniform in distribution and adjustable in content, and iron particles of the prepared nano iron-carbon composite powder are smaller than 20nm. The nano iron-carbon composite powder preparation method has the advantages of easiness in material acquisition, equipment simplicity, short process, high efficiency, low cost and applicability to industrial production.

The invention relates to a preparation method of a nitrogen sulfur co-doped carbon nanosheet material. The method includes the steps of: 1) dissolving sodium carboxymethylcellulose in water, and stirring the substances evenly to obtain a sodium carboxymethylcellulose solution; 2) adding a molten salt into the sodium carboxymethylcellulose solution obtained in step 1), and stirring the substances evenly to obtain a mixed solution, with the molten salt being any one or a mixture of several of sodium chloride, potassium chloride, sodium nitrate and potassium nitrate; 3) subjecting the mixed solution obtained in step 2) to freeze drying to obtain a dried sample; 4) conducting carbonization treatment on the dried sample obtained in step 3) at 700-900DEG C to obtain a carbon nanosheet material crude product; and 5) conducting washing and drying on the carbon nanosheet material crude product obtained in step 4), thus obtaining a carbon nanosheet material finished product. The process adoptedby the invention is simple and environment-friendly, and can achieve large-scale industrial production of carbon nanosheet material.

The invention relates to the technical field of planting, in particular to an efficient planting method for mulberry. The method comprises the following steps of seedling growing, transplanting, pest control and field management. By adopting the planting method, planted mulberry is high in disease resistance and insect resistance, high in yield and strong in pesticide effect, compared with the acre yield of mulberry planted through a traditional method, the yield of folium mori can be increased by 28% or above, the yield of mulberry fruits can be increased by 13.2% or above, and due to the planting method, the acre yield of mulberry trees is effectively improved; the survival rate of seedlings is increased by 9.4% compared with a traditional method; on the basis of the scientific planting method, effective components of mulberry trees can be effectively improved, the pesticide effect is improved, and the requirement of the current market for a large number of mulberry trees is met.

The invention relates to laser cladding powder for 30CrMnSiNi2A steel and a preparation method. The laser cladding powder is prepared from the following components in weight percent: 0.8% to 1.0% of Cr, 0.75% to 1.10% of Mn, 0.65% to 1.10% of Si, 2.0% to 3.2% of Ni, 0.16% to 0.22% of C, 0.15% to 0.20% of Cu, 0.015% to 0.020% of P, 0.01% to 0.015% of S, 0.001% to 0.015% of rare earth and the balance of Fe. The invention further provides the preparation method of the laser cladding powder, the laser cladding powder is exclusively used in a laser cladding technique of the 30CrMnSiNi2A steel, excellent bonding strength and low metallurgical defects and dilution rate of a cladding interface are guaranteed, the toughness of a cladding layer is increased, the wettability of the cladding powder is improved, the cracking of the cladding layer is inhibited, and the crack growth rate is reduced.

The present invention relates to a copper-iron-carbon aerogel electrode preparation method. According to the method, resorcinol, formaldehyde, water, sodium carbonate, iron acetylacetonate and copper acetate monohydrate are uniformly mixed in a reaction container according to a certain ratio, a polymerization reaction is performed for a certain time at a certain temperature to prepare a wet gel, the wet gel is dried, programming heating and cooling is performed to prepare the copper-iron-carbon aerogel electrode, and the prepared copper-iron-carbon aerogel electrode is activated sequentially through CO2 and N2 so as to be used as the cathode in the degradation pool to degrade organic pollutants such as dimethyl phthalate and the like. Compared to the method in the prior art, the method of the present invention has advantages of simple preparation process, high activity, low treatment cost for degradation of organic pollutants such as DMP and the like, simple treatment process, flexible degradation, and the like.

The invention belongs to the technical field of seedling cultivation, and particularly relates to a seedling method of five-pointed star loquat. The method comprises the following steps of female parent processing, substance cuttage, cuttage and daily management; according to the seedling method, a scientific and reasonable seedling management mode is formed, rooting of cutting slips can be effectively promoted, the method is beneficial for the growth and development of the root system, and the growth of fibrous roots of the cutting slips is promoted; the cutting slips absorb nutrients in the rooting process, the content of endogenous hormones of plants and the activity of important enzymes are adjusted, the metabolism intensity of the plants is adjusted, the survival rate is high, the diseases and insect pests are few, and the growth condition of the root system is good.

The invention provides a VC / a-C:H nano-composite coating, which is prepared from hard-phase nanocrystal VC and lubricating-phase amorphous a-C:H, wherein the a-C:H is taken as a matrix and the nanocrystal VC is dispersed into the matrix, so that the characteristics of high hardness and low abrasion of a traditional VC hard coating are kept, meanwhile, the VC / a-C:H nano-composite coating has excellent self-lubricating characteristics of the a-C:H material, can play a good protecting role on a substrate operating in high-abrasion and high-friction environments and has good application value. The invention further provides a preparation method. A multi-arc ion plating technology is adopted, a metal V is taken as a target material, C2H2 is taken as a reaction gas, the content of a V element and a C element in the coating can be regulated and controlled through controlling the gas flow of V target current and / or a carbon source C2H2, so that the contents of a VC phase and an a-C:H phase in the coating are regulated and controlled.

The invention provides a solid lubrication composite coating on the surface of a base body. The composite coating is composed of hard phase nanocrystalline CrC and a lubricating phase a-C, a CrC / a-C composite coating is formed, the characteristics that the CrC hard coating is high in hardness and low in abrasion are kept, and meanwhile the excellent self-lubricating property of the a-C material is achieved. The multi-arc ion plating technology is adopted, metal Cr serves as a target material, high-purity Ar serves as working gas, C2H2 serves as reaction gas, the CrC / a-C composite coating is deposited on the surface of the base body, and the content of the CrC phase and the a-C phase in the composite coating can be regulated and controlled by controlling the flow of the Cr target current and the reaction gas C2H2. The hardness of the composite coating reaches up to 31 GPa, the abrasion rate reaches the magnitude of 10<-16> m<3> / N.m, the friction coefficient in the atmospheric environment is lower than 0.2, the base body working in the high-abrasion and high-friction environment can be well protected, and very high application value is achieved.

The invention provides a method for preparing sulfur vacancies by partially reducing bismuth sulfide through ascorbic acid, and a reduced bismuth sulfide nanowire has the width of 50-300 nanometers and the length of 100-200 microns. The material can be used as an active material for electrocatalytic carbon dioxide reduction, and shows excellent formic acid product selectivity by utilizing specificadsorption of the sulfur vacancies to a carbon dioxide reduction active intermediate. The method has the characteristics of simple process, mild reaction conditions, excellent electrochemical performance of the material and the like.

The invention discloses a plant recombination expression vector, belongs to the technical field of genetic engineering, and is characterized in that the provided plant recombination expression vector comprises a fusion sequence of a transcription factor, a promoter and a key enzyme gene; the promoter comprises an element specifically responding to the transcription factor; and the promoter can be constitutive, inducible or tissue specificity expression promoter, preferably a promoter with jere element, most preferably tdc promoter. The invention also provides a transformant of the plant recombination expression vector, wherein the preparation method of the transformant comprises the following steps: preparing the plant recombination expression vector; transforming a plant material; and screening a transgenic plant material.

The invention relates to cadmium sulfide with adjustable hexagonal phase and cubic phase content, and a preparation method and applications thereof. The microtopography of the cadmium sulfide is of a sheet structure; the length of the cadmium sulfide nanometer sheets ranges from 25 to 50nm, and the width ranges from 8 to 15nm. According to the preparation method, cadmium chloride hemipentahydrate and sublimed sulfur are taken as raw materials, deionized water and diethylenetriamine are taken as solvents, solvothermal method is adopted to prepare cadmium sulfide, and the hexagonal phase and cubic phase content of cadmium sulfide is adjusted and controlled via adjusting and controlling the molar ratio of cadmium chloride hemipentahydrate to sublimed sulfur, so that optimization of the capability of the prepared cadmium sulfide in hydrogen production via photocatalytic decomposition of water with visible light is realized.

The invention provides a preparation method of metalloporphyrin / carbon nano-tube paper flexible gas sensor. The method comprises the following steps: firstly preparing metal tetra(4-sodium sulfate phenyl) porphyrin, and then uniformly mixing with the carbon nano-tube to prepare a metalloporphyrin / carbon nano-tube dispersion solution; and then uniformly mixing paper pulp obtained after shearing anddispersing paper fiber at high speed with the metalloporphyrin / carbon nano-tube dispersion solution; rolling an acquired filter cake at a certain temperature and pressure by adopting a vacuum suctionfiltration method, thereby preparing the metalloporphyrin / carbon nano-tube paper flexible gas sensor. The preparation method provided by the invention has the advantages that the preparation method is simple, the cost is low, the sensor can be regulated and controlled by controlling the metal variety in the porphyrin, thereby acquiring a flexible gas sensor with specific response for different gases.

The invention discloses a feed additive capable of improving flavor of rabbit meat. The feed additive consists of the following components in parts by weight of 15-25 parts of buckwheat flour, 3-5 parts of eggshell powder, 2-5 parts of phytosterol, 0.2-0.6 part of selenium yeast, 1-2.5 parts of probiotic powder, 2-5 parts of conjugated linoleic acid, 3-8 parts of saccharicterpenin and the balanceof a plant carrier substrate. The feed additive is applied to basic ratio of rabbits, and is added to feeds according to the addition proportion of the feed additive to the feeds being 1%. TraditionalChinese medicine materials are added, so that according to the feed additive, the attack rate and the mortality rate of the raised rabbits are notably reduced, the immunity of the raised rabbits canbe improved, and growth and development of the raised rabbits are promoted. Normal growth and development of the rabbits are guaranteed, the utilization efficiency of the feeds is improved, the lean meat percentage is increased, the content of intramuscular fat is adjusted and controlled, the fleshy tenderness and the juice degree of the raised rabbits are increased, and the quality of the rabbitmeat is improved.

The invention discloses a method for preparing an aluminum-nitrogen co-doped diamond-like composite film. Two dual-excitation energy source cathode arc coating devices with different characteristics are configured by adopting an ion source-assisted cathode arc deposition technology, one dual-excitation energy source cathode arc coating device adopts a direct-current arc evaporation cathode sourceand is used for installing an aluminum target, and the other dual-excitation energy source cathode arc coating device adopts a pulsed arc evaporation cathode source and is used for installing a graphite target; nitrogen gas is taken as reaction gas in the deposition process, nitrogen gas (N2) is ionized into ionic nitrogen (N<+>) through an ion source, the aluminum target installed on the direct-current arc evaporation cathode source and the graphite target installed on the pulsed arc evaporation cathode source achieve sputtering deposition on the surface of a workpiece by rotating the workpiece, and the component-controllable aluminum-nitrogen co-doped diamond-like composite film is obtained. According to the method for preparing the aluminum-nitrogen co-doped diamond-like composite film,the film is doped with N in an ion mode, and hard aluminum nitride (AlN) and metal Al nanocrystalline particles are promoted to be formed in the diamond-like composite film; and the diamond-like composite film has the advantages of being smooth in surface, high in hardness and toughness and low in stress.

The invention discloses an in-suit loaded type foam microporous precious metal catalyst, and a preparation method thereof. According to the preparation method, an amorphous alloy wire with a cross section area of S0 (or a woven product of the amorphous alloy wire) is taken as a precursor, and is immersed in an acid solution for corrosion of the amorphous alloy at certain depth of the external surface of the amorphous alloy wire through dealloying reaction so as to obtain a nanometer porous precious metal catalytic layer, and at the same time, a amorphous wire core with a cross section area ofS(S<S0) is maintained as a structure support, so that the in-suit loaded type foam microporous precious metal catalyst with a foam microporous precious metal annular external shell catalytic layer andan internal amorphous wire core composite structure. The preparation method is low in cost, is simple in operation, and is controllable, and is capable of producing the precious metal catalyst material with an excellent structure and excellent performance.

The invention discloses a catalyst for preparing low-carbon alcohol through carbon dioxide conversion and a preparation method and application thereof, and belongs to the technical field of carbon dioxide resource utilization. The preparation method comprises the following steps: carrying out mechanical ball milling on a cobalt simple substance, a cobalt compound and / or a catalyst carrier which are uniformly mixed, and then carrying out heat treatment to obtain a catalyst product after the heat treatment is completed. According to the preparation method of the catalyst for preparing the low-carbon alcohol by converting the carbon dioxide, provided by the invention, the cobalt elementary substance and the oxide or hydroxide of the cobalt are used as raw materials, the interaction between the elementary substance cobalt and a cobalt compound is enhanced under the action of mechanical ball milling, Co0-Cox + double sites are created, and the double sites can catalyze the generation of the alcohol and the growth of a carbon chain; the selectivity of the low-carbon alcohol is greatly promoted, and the selectivity of the low-carbon alcohol is higher than 90%; the preparation method has the characteristics of less waste liquid, low cost, simple process and the like, and has a good application prospect.

The invention relates to a preparation method of copper-doped Li4Ti5O12-TiO2 regulation and control composite material. The method comprises the steps of feeding tetrabutyl titanate into ethyl alcohol to prepare a solution A; feeding lithium hydroxide into distilled water to prepare a solution B; slowly feeding the solution B into the solution A, stirring for half an hour, and then feeding copper acetate into the mixed solution; continuing to stir for an hour to obtain a mixed solution; putting the mixed solution into a high-pressure reaction kettle, and carrying out a reaction for 12-24 hours at the temperature of 160-180 DEG C to obtain a precursor; calcining the precursor for 2-6 hours at the temperature of 600 DEG C to obtain a target product. The preparation method has the advantages that the copper element with different contents is fed into the material, so that the crystal form and the content of TiO2 in a Li4Ti5O12-TiO2 system are effectively regulated and controlled; the prepared composite material is an anode material which is long in cycle life, and high in safety, energy and power density; the preparation method is simple in technology, easy in operation and high in practicality.

The invention discloses a doped CaFe2O4@alpha-Fe2O3 heterojunction composite photocatalyst, and a preparation method and applications thereof. According to the preparation method, converter sludge is subjected to hydrochloric acid acidolysis so as to transfer metal ions such as Fe, Ca, Al, Mg, and Mn in converter sludge into an obtained acidolysis liquid, insoluble substances are removed via filtering so as to obtain an acidolysis solution, a certain amount of sodium oxalate is added so as to obtain a mixed solution, and the mixed solution is subjected to hydrothermal reaction, room temperature secondary precipitation, and short time heat treatment so as to obtain a finished product. The component elements of the doped CaFe2O4@alpha-Fe2O3 heterojunction composite photocatalyst all come from converter sludge, no chemical reagent raw material is added, a problem in the prior art that raw materials all come from a plurality of chemical reagents is solved, preparation cost is reduced, a novel method used for high additional value utilization of iron containing metallurgical dust is provided, the obtained doped CaFe2O4@alpha-Fe2O3 heterojunction composite photocatalyst possesses excellent photocatalytic activity and recycling performance, and can be used for photocatalytic degradation of organic dye pollutants in waste water.

The invention relates to a method for reinforcing the surface of a zirconium-based amorphous alloy through laser irradiation of silicon carbide particles, and belongs to the technical field of amorphous alloy surface modification. A silicon carbide particle medium is irradiated by laser, a silicon carbide particle phase is introduced into a parent phase on the surface of the zirconium-based amorphous alloy, and the surface hardness and the plastic deformation capacity of the zirconium-based amorphous alloy are improved. The method effectively solves the problems that the mechanical property is difficult to regulate and control, the manufacturing process is complicated and the like in the existing amorphous alloy particle reinforcing method. By changing laser irradiation parameters and types and parameters of the silicon carbide particle medium, the content of the silicon carbide phase on the surface of the zirconium-based amorphous alloy can be effectively regulated and controlled. The method is simple in implementation process, high in efficiency, clean, free of pollution and high in practicability, and can be applied to regulation and control of the surface hardness of the zirconium-based amorphous alloy and enhancement of functional application of the zirconium-based amorphous alloy.

The invention relates to a laser cladding powder for 30CrMnSiNi2A steel and a preparation method. The amount of each component in the laser cladding powder is Cr 0.8%-1.0%, Mn 0.75%-1.10%, Si 0.65% by weight percentage ‑1.10%, Ni2.0%‑3.2%, C0.16%‑0.22%, Cu0.15%‑0.20%, P0.015%‑0.020%, S0.01%‑0.015%, Rare earth 0.001%‑0.015% , the remainder is iron. The present invention further proposes a preparation method of the cladding powder. The laser cladding powder is specially used in the laser cladding technology of 30CrMnSiNi2A steel, so as to ensure the excellent bonding strength of the cladding interface, lower metallurgical defects and reduced dilution rate, and improve the fusion rate. The toughness of the cladding layer improves the wettability of the cladding powder, inhibits the cracking of the cladding layer and delays the crack growth rate.

The present invention provides banana transcription factors MaARF12 and MaARF24, which are proteins encoded by genes whose nucleotide sequences are shown in SEQ ID NO: 1 and SEQ ID NO: 2, respectively. The present invention also provides the encoding gene and application of the above transcription factor. Both the banana transcription factors MaARF12 and MaARF24 of the present invention can be combined with the promoter region of the banana fruit starch branching enzyme gene MaSBE2.3, can interact with the MaSBE2.3 gene, and inhibit its expression, which is beneficial to regulating the content of amylopectin and improving starch It is of great significance to cultivate new banana varieties with high quality and provide candidate transcription factor resources for improving the quality of amylopectin in bananas or other fruits.

The invention provides a solid lubrication composite coating on the surface of a base body. The composite coating is composed of hard phase nanocrystalline CrC and a lubricating phase a-C, a CrC / a-C composite coating is formed, the characteristics that the CrC hard coating is high in hardness and low in abrasion are kept, and meanwhile the excellent self-lubricating property of the a-C material is achieved. The multi-arc ion plating technology is adopted, metal Cr serves as a target material, high-purity Ar serves as working gas, C2H2 serves as reaction gas, the CrC / a-C composite coating is deposited on the surface of the base body, and the content of the CrC phase and the a-C phase in the composite coating can be regulated and controlled by controlling the flow of the Cr target current and the reaction gas C2H2. The hardness of the composite coating reaches up to 31 GPa, the abrasion rate reaches the magnitude of 10<-16> m<3> / N.m, the friction coefficient in the atmospheric environment is lower than 0.2, the base body working in the high-abrasion and high-friction environment can be well protected, and very high application value is achieved.

The invention provides a nickel-modified molybdenum carbide catalyst and its preparation method and its application in the reaction of carbon dioxide hydrogenation to prepare ethanol. The good hydrogenation ability of nickel and the good ability of molybdenum carbide to activate carbon dioxide make nickel carbide composite bimetallic Compared with non-precious metal catalysts, the catalyst exhibits high selectivity and high activity. Compared with noble metal catalysts, the nickel-molybdenum carbide catalyst has the characteristics of low price and simple preparation.

The invention belongs to the technical field of nano composite preparation and relates to a nano iron-carbon composite powder preparation method. The nano iron-carbon composite powder preparation method is characterized by including the steps: taking ferric nitrate as an iron source, taking water-soluble organics as a carbon source, and preparing the ferric nitrate, the carbon source and a reducing agent into homogeneous aqueous solution; heating the solution to enable volatilization, concentration and decomposition of the solution to obtain a precursor; calcining in a reducing atmosphere to obtain nano iron-carbon composite powder, wherein metal iron particles of the nano iron-carbon composite powder are uniform and adjustable in size distribution, iron / carbon phases of the nano iron-carbon composite powder are uniform in distribution and adjustable in content, and iron particles of the prepared nano iron-carbon composite powder are smaller than 20nm. The nano iron-carbon composite powder preparation method has the advantages of easiness in material acquisition, equipment simplicity, short process, high efficiency, low cost and applicability to industrial production.

The invention discloses a preparation method of a composite fiber film. According to the preparation method, an electrostatic spinning method is used, by taking silk fibroin, gelatin and other naturalpolymers as fiber carriers and silver nitrate as a silver source or chloroauric acid as a gold source, the precious metal-silk fibroin / gelatin composite fiber film with good water vapor permeabilityand antibacterial performance under conventional conditions is prepared. The prepared composite fiber film has unique biological properties such as biocompatibility and biodegradability, has high mechanical properties, material processing and spinnability, and has a good inhibition effect on gram-positive bacteria and gram-negative bacteria. The composite fiber film material prepared by the invention can be used as a novel antibacterial textile raw material which is good in stability, degradable and simple and safe in preparation method, and has a wide application prospect.