49 results about "Silver preparation" patented technology

The invention relates to a water-soluble nano silver preparation method based on waste keratin degradation products. The waste keratin degradation products are preprocessed, the waste keratin degradation products and distilled water are then put into a reaction kettle, and after thermal degradation is conducted on the waste keratin degradation products and the distilled water, a keratin solution is obtained; keratin polypeptide powder prepared after the keratin solution is purified and concentrated is used for preparing a keratin polypeptide aqueous solution, and the keratin polypeptide aqueous solution is mixed with a silver compound solution to prepare the water-soluble nano silver of different particle sizes under different temperature and pH value conditions. When the preparation method is compared with the prior art, the method that polypeptide chain sections obtained from the situation that the waste keratin materials are degraded through overheated water serve as a biological template to prepare nano materials is put forward for the first time. Water-soluble nano silver particles prepared through the method have good dispersity and good stability, and the particle sizes of the water-soluble nano silver particles can be controlled through changing of parameters; meanwhile, the whole process of the water-soluble nano silver particles is simple and easy to operate and capable of being directly applied to fields such as biological medicine because any chemical reagent and other hazardous substances do not participate in the preparation process.

The invention provides a method for recycling silver and copper in silver and copper alloy scrap, relating to a method for the wet recycling of the silver and copper in the silver and copper alloy scrap. The method is characterized in that the recycling process comprises the steps that the silver and copper alloy is firstly dissolved by using nitric acid, the solution is heated, evaporated and condensed to obtain silver nitrate and copper nitrate crystal; heating is continued to obtain a copper oxide mixture with decomposed silver nitrate and copper nitrate, water is slowly added into the mixture to cause the silver nitrate in the mixture to be dissolved, solid copper oxide and silver nitrate solution are separated out by filtration, and finally, a silver nitrate solution electro-deposition tank is added to directly carry out electro-deposition to prepare electro-deposited silver. Compared with the traditional method, the method of the invention eliminates the processes of chloridized silver deposition and copper separation, and hydrazine hydrate reduction silver-preparation, thus effectively reducing the reagent consumption and the silver-recycling cost. Acid-containing solution generated in the electro-deposition process can be circularly used for silver and copper alloy dissolving without emission. The method of the invention can separate and recycle silver and copper, with high efficiency, low cost and simplicity, and has high electro-deposited silver quality.

The invention provides a nano silver preparation process, which is characterized by comprising the following steps: A. dissolving silver salt and a protective agent into a water soluble solvent or an alcohol solvent; B. adjusting the pH value into a needed range; C. adding a reducer to the obtained mixed solution, and heating and stirring for reacting for 20-30 minutes; and D. finally obtaining golden yellow nano silver solution. Compared with the prior art, the nano silver obtained by the preparation process of the invention is degradable, nontoxic and harmless to people and livestock, environmental friendly and soluble in water and most of organic matters totally, wherein, the particle size of the obtained nano silver product is less than 10nm and the complete reaction rate of silver ions is more than 99.99%. The nano silver preparation process has the advantages of simplicity, simple manufacturing equipment, low cost, food-grade raw materials and no any emissions and environmental pollution in the whole preparation course.

Cleaning and/or conditioning electrode surfaces can provide significant performance and operational benefits in EHD devices. In particular, conditioning of emitter electrode surfaces with silver (Ag), silver compositions or silver preparations applied in situ at successive times throughout the operating lifetime of an EHD air mover has been found to significantly reduce ozone production. Structures and techniques are described for in situ conditioning electrode surfaces and, in particular, emitter electrode surfaces of an EHD device such as an air mover or precipitator, with a conditioning material that includes silver.

The invention discloses a chitosan oligosaccharide derivative and a nano-silver preparation method. The nano-silver preparation method comprises the following steps of: (1) synthesizing chitosan oligosaccharide Schiff base S-COS; (2) synthesizing chitosan oligosaccharide phosphonate S-COS-P; and (3) preparing the nano-silver by reducing the chitosan oligosaccharide derivative. A method for synthesizing the chitosan oligosaccharide derivative by taking chitosan oligosaccharide as a raw material under the condition of microwave radiation is explored, and the structure of the chitosan oligosaccharide derivative is characterized, the optimum reaction conditions of the chitosan oligosaccharide derivative are explored, and simultaneously, the nano-silver is prepared by reducing the synthesized chitosan oligosaccharide derivative; and the nano-silver preparation method is preliminarily explored, and the structure of the nano-silver is characterized; and the preliminary conclusion of nano-silver preparation is obtained.

The invention discloses a simple method for preparing nano silver from a bacterial fermentation solution. The method comprises the steps of inoculating staphylococcus aureus or enterococcus faecalis to a Mueller-Hinton culture medium, implementing shake cultivation for 12-72 hours at 25-37 DEG C, separating the thallus from bacterium suspension, reserving the bacterium suspension, adding a silver nitrate solution to the bacterium suspension so that silver ion concentration is 0.5-10mM, implementing shake cultivation for 5-72 hours at 25-37 DEG C, carrying out ultrasonic treatment, filtering the solution after the ultrasonic treatment, and reserving filtrate to obtain a nano silver solution. The method, which is used for preparing nano silver particles through the bacterial fermentation solution, is simple and easy, strong in operability and low in cost, and is free from toxic and harmful substances to the environment, thus being a simple and environment-friendly nano silver preparation technology.

The invention discloses a method for preparing nano-silver from nanocellulose hydrogel, and belongs to the field of nano-silver preparation. The method comprises the steps that nano-hydrogel is prepared from nano-bamboo fiber, the hydrogel is soaked in a silver salt solution, silver ions are adsorbed through the internal network structure of the hydrogel and rich groups contained in the hydrogel, the hydrogel adsorbing the silver ions is put into a reducing agent to be soaked to generate nano-silver, and then impurity removing through separation and spray drying are performed to obtain nano-silver powder. The nano-silver prepared through the method is uniform in particle size, high in purity and good in dispersity, the prepared hydrogel is good in polymerization degree, and therefore the nano-silver powder of the small size can be obtained; in addition, the preparation conditions are easy to control, the cost is low, no surfactant needs to be added, and pollution to the environment is reduced.

The invention discloses a method for preparing an antibacterial plant tissue culture medium. According to the invention, a green pollution-free and low-cost nano-silver preparation method is adopted, which comprises the following steps of reducing a silver nitrate solution with D-glucose or galactose as a reducing agent in an aqueous solution by virtue of a liquid-phase chemical reduction method at 15-25 DEG C, and adding the obtained nano-silver sol into a culture medium, adding sucrose as a carbon source and an energy material and testing the resistance to bacteria in air of the nano-silver sol. The green pollution-free and low-cost nano-silver preparation method disclosed by the invention is simple and easily operated, the prepared nano-silver sol has the characteristics of uniform and moderate particle size and uniform dispersion. The nano-silver sol disclosed by the invention has good compatibility with the culture medium system. The culture medium in which the nano-silver sol is added has a good antibacterial effect.

The invention belongs to the technical field of nanometer material preparation, and particularly relates to a flower-like silver preparation method adopting gallic acid as a structure-directing agent.Under an ice-water bath, a silver nitrate water solution and a protective agent polyvinylpyrrolidone solution are added into ultra-pure water, magnetic stirring is performed, a structure-directing agent gallic acid solution is added into the system, continuous stirring is performed, a reducing agent ascorbic acid solution is rapidly injected into the system, a reaction is performed, after the reaction is finished, a reaction solution is taken out, and ultra-pure water is used for centrifugal cleaning to obtain flower-like silver particles. The prepared flower-like silver is of the complete and clear multi-level structure, the specific area is large, and the performance and the application field of silver nanoparticles are greatly enlarged.

The present disclosure relates to a liquid nano silver preparation method. The method comprises the following steps of 1, adding a stabilizer to a silver nitrate solution at room temperature and magnetic stirring; 2, stirring the mixture and adding an ascorbic acid solution, specifically, the molar ratio of silver nitrate to ascorbic acid is controlled to range from 1:4 to 1:7; 3, adding a sodiumhydroxide solution to control the pH value of a system to range from 7.6 to 8.0; and 4, stirring the mixture to obtain a liquid nano silver product. The liquid nano silver prepared by the method has an excellent antibacterial effect, and especially has an antibacterial effect against bacillus subtilis, and the antibacterial rate is almost 100%; the liquid nano silver can also inhibit the growth ofaspergillus niger, the inhibition rate is 90%, and the effective antibacterial time can be up to 30 days; the preparation method is simple and easy to implement, and conforms to the green chemistry concept.

The invention discloses a simple method for preparing nano-silver based on a plumeria rubra extracting solution. A plumeria rubra ethanol extracting solution is mixed with a silver ion solution to react to generate the nano-silver. The plumeria rubra extracting solution is used for reducing silver ions to prepare the elementary substance nano-silver. The method can prepare nano-silver particles with the particle size of 1-57nm. According to the method, the plumeria rubra extracting solution is used for preparing the nano-silver particles, and the preparation method is simple, easy to implement, high in operability and low in cost. The plumeria rubra extracting solution serves as a reducing agent and a stabilizing agent at the same time, other chemical components do not need to be added in the reaction process, and a large number of nano-silver particles are prepared within a short time. The method is a simple and environmental-friendly nano-silver preparation method.

A preparation method of a nano-silver particle coated by a novel macromolecule protective agent belongs to the technical field of manufacture of printing electronic materials. The steps comprise that a) a solution of the macromolecule protective agent with a certain temperature, a certain concentration and a certain pH value is prepared; b) a silver ammonia solution and a reductant solution are added into the macromolecule protective agent solution; c) the mixed solution is stirred, the pH value of the mixed solution is monitored in a real time, and the pH value of the mixed solution is kept to exceed 7 by adding a pH modifier; and the nano-silver particle can be prepared through a chemical reaction. In comparison with the prior art, the preparation method of the nano-silver particle coated by the novel macromolecule protective agent provided by the invention has the beneficial effect that acrylic-based resin with a multi-carbonyl structure is taken as the protective agent for the nano-silver preparation in an alkaline environment, wherein no research report has been proposed domestically; and because of outstanding aging resistance (such as the resistance to corrosion of acids, weak alkalis and salts) and adhesive force of the acrylic-based resin, the prepared nano-silver particle can guarantee requirements in applications for the adhesive force and the aging resistance without addition of other types of resin.

The invention provides a nanometer porous silver preparation method, which comprises: immersing a solid material at least containing silver on the surface into a liquid electrolytic solution containing transition metal ion and a metal chloride, wherein the solid material is used as precursor; promoting the silver surface to spontaneously form silver chloride by using the transition metal cation through a micro battery reaction; and carrying out electrical reduction to form nanometer porous silver. The invention further provides a preparation method of a self-supporting nanometer porous silverelectrode, wherein the self-supporting nanometer porous silver electrode is prepared by using a silver electrode as a precursor through the method. Compared with the nanometer porous silver in the prior art, the nanometer porous silver of the present invention has the following characteristics that the silver surface spontaneously form the silver chloride by using the transition metal cation through the micro battery reaction, and the electrical reduction is performed to form the nanometer porous silver, such that the oxygen reduction activity is significantly improved compared with the original silver electrode. Compared with the method in the prior art, the method of the present invention eliminates the energy consumption process for applying voltage to the silver electrode to form AgClso as to reduce the energy consumption, and further has advantages of simpleness, strong controllability and the like.

The invention discloses a method for preparing nano-silver based on a red spinach extracting solution. The method is characterized by mixing the red spinach ethanol extracting solution with the silver ion solution, and reacting to generate the nano-silver. According to the method, the red spinach extracting solution is used for reducing silver ions to prepare the simple substance nano-silver. The nano-silver particles with the particle size of 1-30 nm can be prepared according to the method provided by the invention. The nano-silver particles are prepared from the red spinach extracting solution, the preparation method is simple and easy to implement, high in operability and low in cost, the red spinach extracting solution serves as a reducing agent and a stabilizing agent at the same time, other chemical components do not need to be added in the reaction process, a large number of nano-silver particles are prepared within a short time, the method is a simple and environment-friendly nano-silver preparation method, and the prepared nano-silver solution has a high antibacterial effect.

The invention discloses an acrylic fiber conductive filament and a chemical silvering preparation method. The method takes acrylic fiber filament as a matrix, and fully uses an acrylic fiber filamentbark-like surface structure and -CN electronegativity, the acrylic fiber filament is subjected to degreasing, coarsening and activation, and is subjected to pressurization, heating and dipping in an enclosed alkaline silver ammonium solution for chemical plating, and a white silver simple substance is formed at the surface of acrylic fiber, so that the filament conductive processing is carried out. The prepared acrylic fiber conductive filament has the advantages of easy control, good conductivity, strong fiber affinity capability, lasting conductive characteristic, excellent sterilization deodorizing shielding property, and good acid and alkali resistance.

The invention discloses an externally-applied nano silver preparation and a preparation method thereof. The preparation comprises lanonol, cetanol, lecithin, sorbitan, Tween-80, dimethyl p-aminobenzene methyl caprylin and mineral oil which form an oil phase, glycerol and deionized water which form a water phase, as well as nano sliver particle, cerous nitrate, acetic acid, chitosan and sodium polyacrylate. According to the method disclosed by the invention, the water-phase material and the oil-phase material flow into an emulsification neutralization tank for emulsification after being heated, and nano silver master rubber, cerium preliminary liquor and chitosan are added, and finally, the externally-applied nano sliver preparation is prepared. The preparation disclosed by the invention has a bacteriostatic effect and a sterilization effect, and particularly has very obvious effects for intractable pseudomonas aeruginosa and staphylococcus aureus. Besides, the externally-applied nano silver preparation has good permeability so as to be applied to a deep wound part, has good astringency to accelerate healing of a wound surface, is free from irritability and has an effect of promoting epithelial cells to grow.

The invention belongs to the technical field of nano-silver preparation, and discloses a preparation method of a kelp-shaped nano-silver structure. The preparation method comprises the following stepsthat S1, a mixed solution of hydrofluoric acid, silver nitrate and SDS is prepared; S2, a cleaned silicon wafer is soaked in the mixed solution prepared in the S1 to react for a period of time; and S3, after the reaction, the silicon wafer is cleaned up, and blow-drying is carried out to obtain the kelp-shaped nano-silver structure, wherein in the S1, the concentration of the hydrofluoric acid inthe mixed solution is 10<-6> M-10 M, the concentration of the silver nitrate in the mixed solution is 10<-6> M-1 M, and the concentration of the SDS in the mixed solution is 10<-6> M-1 M. The methodis simple to operate, low in cost and simple and convenient in process, and facilitates the preparation of a novel kelp-shaped nano-silver structure.