370 results about "Silver sulfide" patented technology

The invention discloses a visible-light-induced photocatalyst loaded with four vanadium tetrasulfide (VS4) active component and a preparation method and belongs to the technical field of photocatalytic techniques. Graphene, carbon nano tube and silver sulfide are used as template carriers to improve the photocatalytic activity. The photocatalyst takes VS4 as the active component and the carbon nano tube as a carrier, and is prepared through a solvothermal method. The result shows that the prepared composite photocatalyst has good response at the visible light area and can effectively carry out water photolysis reaction; the success of the preparation of the photocatalyst has a certain theoretical and practical significance on sewage photocatalytic decomposition and hydrogen preparation through water photodecomposition for solving energy crisis.

The invention discloses a comprehensive recycling process for polymetallic material containing gold and silver, belongs to the field of non-ferrous metal comprehensive recovery, and mainly comprises the following steps: ball-milling polymetallic material containing gold and silver, leaching bismuth, copper and tin from the polymetallic material by sulfuric acid leaching agent and ferric chloride, recovering the bismuth, copper and tin; retaining lead, gold and silver in the first leaching residue; and recovering the lead, gold and silver. According to the comprehensive recycling process provided by the invention, bismuth, copper and tin are leached from the polymetallic material by sulfuric acid leaching agent and ferric chloride, the oxidation of the ferric in the ferric chloride, and the chloride solution function of the chloride ion to bismuth and tin are creatively utilized, the addition of sulfuric acid and ferric chloride has the effect of changing silver oxide and silver sulfide into silver chloride, so as to reduce the chlorination step cost, and further reduce the dosage of sodium chlorate and hydrochloric acid, and the leaching rate of gold and silver is greatly improved accordingly. The comprehensive recycling process provided by the invention has the advantages that the technology is simple and practicable, the process is short, the device is simple, and the operation is convenient; and the adopted raw material is common, cheap and pollution free.

The invention relates to a preparation method and application of an unmarked immunosensor for rapidly detecting clenbuterol. Clenbuterol means a medicine of a beta-stimulant type instead of a specific medicine, and has the functions of prompting lean meat growth and suppressing fat meat growth as well as extremely serious side effects, and when a large amount of clenbuterol is taken, the cardiovascular system of people can be damaged and severe neurological symptoms can be caused. According to the invention, a gold-silver-sulfide nano composite material modified electrode with a core-shell structure which combines the excellent characteristics of nano gold and nano silver sulfide is adopted for preparing the unmarked immunosensor, and a clenbuterol antibody is well immobilized, so that the unmarked immunosensor is low in cost, high in sensitivity, good in specificity, rapid in detection and simple to prepare.

The invention discloses a method for preparing photonic crystal with an inverse opal structure through ultraviolet radiation. The method comprises: mixing mono-dispersed colloid microspheres with deionized water, and performing ultrasonic dispersion to form a uniform colloid microsphere dispersion liquid; pre-arranging a substrate in a plastic colorimetric ware, soaking the surface of the substrate with the colloid microsphere dispersion liquid for vertical deposition self-assembly, and obtaining a template of the photonic crystal with an opal structure; adding a refractive index material or a precursor material thereof, such as silica, zinc sulfide, zinc oxide, silver sulfide, titanium dioxide, antimony trisulfide, and alumina dropwise on the template, carrying out natural penetration, and performing drying at the room temperature; and removing the initial template of the photonic crystal with an opal structure in an ultraviolet radiation manner to obtain the photonic crystal with an inverse opal structure on the substrate. The method is simple and is low in cost and wide in material selection range.

The invention belongs to the technical field of functional nanometer materials, in particular to a water-phase preparation method of a near-infrared luminescent silver sulfide quantum dot. The preparation method is a normal-temperature and normal-pressure water-phase preparation method and comprises the following steps of: with silver nitrate, bovine serum albumin and sodium sulfide as raw materials, regulating and controlling the nucleation and growth of a nanometer material by using protein, and eliminating unreacted ions through dialysis via a semipermeable membrane to obtain an extra-small (smaller than 10 nanometers) silver sulfide quantum dot stably existing in a water solution. In the preparation process, water is used as a solvent, conditions are mild, operability is strong, an extra-small quantum dot with good luminescent window and better biocompatibility is obtained under extremely mild reaction conditions, and the quantum dot is hopeful to achieve broad application prospect in the aspect of living organism imaging.

The invention discloses a method for preparing monodisperse near-infrared quantum dots, comprising the following steps: using diethyl dithiocarbamate as a monophyletic reaction precursor; carrying out pyrolytic reaction in mixed solution of surface active agent with high boiling point and different coordination properties and selecting silver sulfide as the target product to be prepared to obtainquantum dots with excellent dispersibility, low toxicity and near-infrared emitted light property. The method of the invention features in mild reaction conditions, simple operation, safety and good repeatability, eliminates toxicity caused by using the traditional quantum dots and provides necessary and provides necessary preparations for studies of application of the quantum dots as a fluorescence label indicator to a near-infrared biomarker and to the image formation field.

The invention belongs to the technical field of a thermoelectric conversion material of novel energy, and in particular relates to a flexible semiconductor nanostructural material with high thermoelectric figure of merit based on electrostatic spun nanofiber and a preparation method of the material. The preparation method comprises the steps of taking high polymer and silver nitrate compound nanofiber as a substrate, depositing a silver shell on the surface of the fiber by an electroless method after reducing silver nitrate, and carrying oxidation reduction in situ and vulcanization to obtain a high polymer/silver sulfide nuclear shell nanofiber material. The nanofiber based thermoelectric material prepared by the method has ultrahigh Seebeck coefficient and thermoelectric figure of merit as well as good flexibility, which cannot be compared with conventional thermoelectric materials. For example, the Seebeck coefficient of polyacrylonitrile/silver sulfide nuclear shell nanofiber material reaches more than 103, the maximum thermoelectric figure of merit reaches 0.9 at temperature of 340K, and the original flexibility of the polyacrylonitrile nanofiber is maintained.

The invention provides a beneficiation method for complex multi-metal sulfide electrum comprehensive recovery. According to the technical scheme, an efficient re-separation technology of Knelson concentrators is adopted according to the property and the characteristic of multi-metal sulfide electrum, and coarse gold particles are recovered in the early stage; through composite reagents of sodium sulfite, zinc sulfate and sodium silicate, slurry is highly dispersed, sphalerite and pyrite are inhibited intensively, and a novel collecting agent BK301 is adopted for synchronous flotation enrichment of gold, lead and copper minerals; copper sulfate is adopted for activation, and a fine separation technology is performed many times under high alkalinity (the pH of ore pulp ranges from 11 to 12), influences of slurry are effectively eliminated, and active separation on the sphalerite is achieved; for high-viscosity micro-fine particle cyanidation slag, the composite reagents of lime and zinc sulfate are used for intensively inhibiting copper and sulfur, and optimized lead separation is performed; the adjusting agent sodium pyrophosphate is used for efficient activated separation of copper, and therefore lead separation and copper separation are separately performed.

The present invention provides a stainless steel being excellent in workability, corrosion resistance and antibacterial property. To be more specific, a stainless steel containing 10 wt % or more of Cr is rendered to contain 0.0001-1 wt % of Ag, or further one or more members selected from Sn: 0.0002-0.02 wt %, Zn: 0.0002-0.02 wt %, Pt: 0.0002-0.01 wt %, and, in addition, is rendered to dispersedly contain a total of 0.001 % or more in an area percentage of one or more members of a silver particle, a silver oxide and a silver sulphide each having a mean grain diameter of 500 mum or less. To disperse the silver particle, silver oxide and silver sulphide uniformly, the casting rate of continuous casting is preferably controlled to range from 0.8 to 1.6 m/min.

The invention provides a preparation method of silver sulfide quantum dots, belonging to the technical field of the preparation of semiconductor nanometer materials. The invention mainly provides a novel method for preparing the Ag2S quantum dots with the near infrared fluorescent property, comprising the following steps of: obtaining the quantum dots by a method of thermal injection in non-coordination agent under a relative low temperature due to an organic ligand which is provided with sulfydryl of a short chain, and precipitating in acetone or ethanol and dispersing into chloroform or hexane solvent. The quantum dots prepared by the invention have the fluorescent property at a near infrared region, has certain quantum efficiency and good monodispersity and stability, is uniform in particle size, and the size of the particle does not need selecting, so that the preparation method is simple to operate and low in cost.

A series of metal sulfide grain, its production and use are disclosed. The process is carried out by mixing soluble metal salt with soluble sulfide, adjusting reactive system acid-base content, adding into compound containing amino group as protective agent and preparing into homogeneous elliptical metal sulfide grains containing zinc sulfide, copper sulfide, cadmium sulfide, silver sulfide and platinum sulfide. The granular macro-axis range is between 0.2-10 mum, granular brachy-axis range is between 0.1-5 mum, and granular length diameter ratio is 1.0-10. It's simple and controllable, costs low and has excellent purity and dispersion. It can be used for high-platform products such as fluorescent materials, biological mark material, laser material, photo-crystal package material, electro-luminescent material and micro-nanometer devices.

The invention relates to a titanium dioxide nano-tube film loading a photocatalyst, its preparation method and application, solving the problem of hard immobilization of present indium-zinc-silver-sulfide solid solution. The product is obtained by the following steps: preparing a titanium dioxide nano-tube film by anodic oxidation, loading indium-zinc-silver-sulfide solid solution on the titaniumdioxide nano-tube film by solvothermal synthesis and doping sulfur in a titanium dioxide crystal lattice, used as a photocatalyst for photocatalytic hydrogen production by water decomposition. According to the invention, the immobilization of indium-zinc-silver-sulfide solid solution and the doping of sulfur in titanium dioxide are realized, so as to obtain a novel photocatalytic composite material with good performance of photocatalytic hydrogen production by water decomposition, and the preparation technology is easy to operate. When the photocatalytic time reaches 240min, the hydrogen producing capacity of the product is 1.5 times that of the titanium dioxide nano-tube film without loading the solid solution.

The invention provides a silver sulfide/titanium dioxide nanobelt photocatalyst and a preparation method thereof. During the silver sulfide/titanium dioxide nanobelt photocatalyst preparation, firstly, a silver nitrate solution and titanium dioxide are fully dissolved into deionized water to prepare first mixed liquid; then, a sodium sulfide solution is added into the first mixed liquid; the mixture is fully stirred to prepare second mixed liquid; next, the second mixed liquid is put into a hydrothermal reaction kettle for preparing third mixed liquid; next, the third mixed liquid is filtered to obtain precipitates; finally, the precipitates obtained through separation are washed and are subjected to vacuum heat preservation to prepare the silver sulfide/titanium dioxide nanobelt photocatalyst. The prepared silver sulfide/titanium dioxide nanobelt photocatalyst has the advantages that the specific surface area is great; good sunlight full-wave band photocatalytic activity is realized; the utilization rate of light-catalyzed reaction on sunlight is improved; the utilization range of the sunlight is expanded.

The invention discloses a comprehensive recovery process of low-grade matte slag metal resources. The process comprises the following steps: 1) matte slag performs the crushing and the wet ball milling to reach 100% of particle sizes less than 0.074 mm, and is magnetically separated by a permanent magnetic separator; and magnetically separated tailing is dehydrated for metal leaching and extraction; 2) the magnetically separated tailing performs the oxide leaching to comprehensively leach and extract valuable metal; leaching liquid is extracted to recover Cu; and strip liquor passes through electrodeposition cathode copper plate; 3) copper raffinate removes iron by using a goethite method; after Fe is removed, supernatant is extracted to recover Zn, and the strip liquor is concentrated and crystallized to prepare zinc sulfate; the obtained raffinate is extracted to recover manganese; and the strip liquor is concentrated and crystallized to prepare manganese sulfate; 4) after the raffinate is absorbed by activated carbon to reduce COD, heavy metal is treated by sulfide precipitation; and 5) after leaching slag performs the alkali washing, elemental sulfur and a lead-silver sulfide ore are recovered by flotation. The process solves the difficulty of incomplete recycling of low-grade matte slag, realizes comprehensive recovery of low-grade matte slag resources, and is higher in environmental benefit and economic benefit.

The invention relates to a method for preparing a narrow-bandgap In-rich type AgInS2 photocatalyst with a visible-light response. The method comprises the following steps of fully dissolving silver salt and indium salt in a certain proportion in an organic alcohol solution to form a metal salt precursor; carrying out reaction on the metal salt precursor and an excessive sulfide (a sulfur source) under certain temperature through continuous stirring; enabling the sulfide to react with silver ions at first to form taupe silver sulfide, enabling the silver sulfide to react with the indium salt to generate phase variation with the prolongation of reaction time, and finally obtaining a bronzing solid product; washing and drying the bronzing solid product to obtain the narrow-bandgap In-rich type AgInS2 photocatalyst with a controllable and adjustable spectral absorption range and the visible-light response. The method disclosed by the invention has the outstanding advantages that preparation conditions are gentle, the yield is high, and the spectral absorption range of narrow-bandgap In-rich type AgInS2 is controllable and adjustable; the product, namelyAgInS2, has very high visible light catalyzation and mineralization property and higher regeneration ability.

The invention relates to an antibacterial finishing agent and a preparation method and antibacterial application thereof. The antibacterial finishing agent is a hybrid material aqueous solution loaded with silver sulfide nano-particles and is composed of a hybrid material loaded with silver sulfide nano-particles and water, wherein the hybrid material is composed of carrier molecules A, stabilizer molecules B and silver sulfide nano-particles. The preparation method comprises the following steps: stirring and mixing an aqueous solution of A and an aqueous solution of B, regulating the pH value of the mixed solution, sequentially dropwise adding a silver ion salt solution and a metal sulfide sulfur source aqueous solution into the mixed solution, and stirring, thereby obtaining the hybrid material aqueous solution. The silver sulfide nano-particles in the hybrid material loaded with the silver sulfide nano-particles are stably and effectively connected to a molecular chain of the carrier molecules in forms of ionic bonds and coordinate bonds. The water soluble antibacterial finishing agent is very stable, is high in dispersity and has an excellent broad-spectrum antibacterial effect. Moreover, cotton textiles treated by the using method have extremely high inhibition rate on multiple bacteria after standard soaping of over 20 times.

A method of surface coating a metallic object, including removing substantially all of the existing silver sulfide tarnish if present, ultrasonically cleaning the object with immersion in a solvent, uniformly dispersing selected nanoparticles over the surface of the object by sonicating the object in an ultrasonic bath containing the selected nanoparticles. The invention further includes quickly rinsing the object with solvent upon removal from the ultrasonic bath to inhibit formation of large agglomerates, drying the object with a flow of gas, optically inspecting the object for the presence of agglomeration and applying a barrier layer conformal coating and a protective layer conformal coating.

The invention relates to a method for rapid preparation of a grapheme/silver sulfide quantum dot nanocomposite. The method includes the steps that graphene oxide and AgNO3 are scattered in a dimethyl sulfoxide solution, and the solution is stirred and then transferred into a high pressure reactor for a reaction at the temperature of 150 DEG C to 200 DEG C for 10-15 hours; a product generated from the reaction is rinsed with acetone many times and is cleaned through ethyl alcohol in an ultrasonic vibration mode, and the grapheme/silver sulfide quantum dot nanocomposite is obtained through centrifugal separation and vacuum drying, is of a good and stable single-layer structure and has the photoelectronic property. The method has the advantages that the preparation process is simple and power consumption is low, and both productivity and product performance are greatly promoted in production preparation.

The invention provides a one-step synthetic preparation method of CuInS2 nanowires, which comprises the following steps of: (1) adding a reaction precursor to a reaction vessel and then sequentially adding amine, mercaptan, and a surface ligand to the reaction vessel; (2) placing the reaction vessel in a constant temperature oil bath, reacting under magnetic stirring, and cooling to room temperature at the end of the reaction; and (2) taking an original solution out, diluting with hexane, carrying out ultrasonic oscillation, centrifugally separating at a rotating speed, CuInS2 sinking to the bottom of the vessel, and discarding a supernatant to obtain the CuInS2 nanowires. By utilizing the difference of activity of the precursor, the precursor silver thiocarbamate is firstly decomposed at high temperature to form silver sulfide as a catalyst, copper acetylacetone and indium dithiocarbamate are decomposed at high temperature to form a product dissolved in the silver sulfide catalyst, and CuInS2 is precipitated from silver sulfide particles after saturation is reached to form the CuInS2 semiconductor nanowires. According to the method, the shape and structure of the CuInS2 semiconductor nanowire are controlled at atmospheric pressure, and the yield is up to 90%.

The invention discloses a lotion for removing color spots on the surface of silverware. The lotion is mainly prepared from the following components in parts by weight: 65-89 parts of deionized water, 5-15 parts of glycerol or glycol and 1-5 parts of nano titanium dioxide. Nano titanium dioxide is used as an oxidation reduction catalyst in the lotion, a great number of photoelectrons with strong reducing property are formed in a solution through light energy absorption, and the photoelectrons can be used for reducing silver in color spots such as silver sulfide and the like into elemental silver; meanwhile, nano titanium dioxide is used for producing a great number of photoholes with strong oxidation property, and the photoholes can be reduced by alcohol, so that no secondary pollution is caused in the whole process. Alcohol in the lotion is used as a sacrifice agent to be oxidized, and excess alcohol is used as a wetting agent, so that the catalytic activity of nano titanium dioxide can be effectively promoted. The lotion is free of silver loss while removing the color spots on the surface of the silverware, capable of effectively treating silver plated or fine pattern silverware, convenient to operate, free of active metal or corrosive substances to participate in reaction, and free of potential safety hazards.