241 results about "Bismuth sulfide" patented technology

The invention relates to a compound photocatalysis material with bismuth-sulfide nano particles/bismuth oxychloride and a preparation method thereof. The preparation method comprises the following steps of: firstly, dissolving bismuth nitrate and chlorinated 1-dodecyl-3-methyl glyoxaline into ethylene glycol monomethyl ether respectively, afterwards carrying out a thermal reaction by a solvent soas to prepare bismuth-oxychloride micron balls, then adding the bismuth-oxychloride micron balls into a water solution containing a sulfur source and exchanging parts of ions so as to prepare a compound photocatalysis material containing bismuth-sulfide nano particles and bismuth oxychloride. The method disclosed by the invention can be executed at room temperature and normal pressure, the cost is low, and equipment is simple and is easy to operate; and moreover, the compound photocatalysis material with the bismuth-sulfide nano particles/bismuth oxychloride can be produced at a large scale and has important potential application in the aspect of industrial production. The prepared compound photocatalysis material with the bismuth sulfide/bismuth oxychloride has favorable absorption of visible light, the separation of a photon-generated carrier is obviously improved, and the photocatalysis performance of the material is greatly enhanced.

The invention discloses a preparation method and application of a non-molybdenum sulfide mineral flotation and separation inhibitor. The preparation method for the flotation and separation inhibitor comprises the step of enabling phosphorus pentasulfide and alkaline compounds to react with water-soluble macromolecules, and thus the flotation and separation inhibitor can be obtained. According to the preparation method for the non-molybdenum sulfide mineral flotation and separation inhibitor, operation is easy, the process conditions are mild, the raw material cost is low, and the industrial production requirements are met; and moreover, the prepared product directly serves as the non-molybdenum sulfide mineral inhibitor applied to flotation and separation of molybdenum sulfide minerals and non-molybdenum sulfide minerals, the molybdenum sulfide minerals and the non-molybdenum sulfide minerals can be effectively separated, the grade of molybdenum concentrates is improved, and the flotation and separation inhibitor is particularly suitable for flotation and separation of molybdenite, copper sulfide ore, galena, pyrite, jamesonite, arsenopyrite, bismuth sulfide ore and the like.

The invention provides a preparation method of a hollow tree-like bismuth oxide-bismuth sulfide complex. The preparation method comprises the following steps: (1) taking bismuth nitrate pentahydrate, stirring and dissolving in dilute nitric acid, and then regulating the pH value of a bismuth nitrate solution to 9-14 with a fixed quantity of alkaline solution; then transferring the solution into a crystallization reaction kettle, reacting at the temperature of 80-200 DEG C for 0.5-12h, cooling, filtering, separating, washing with deionized water, washing with anhydrous ethanol, drying and calcining to obtain hollow tubular bismuth oxide; and (2) dispersing the prepared hollow tubular bismuth oxide in the deionized water, adding a water-soluble sulfide while stirring, controlling the molar ratio of the bismuth oxide to the sulfide to be 1: (1-8), then transferring the obtained solution into the crystallization reaction kettle, reacting at 40-180 DEG C for 0.5-36h, cooling, filtering, separating, washing with the deionized water for three times, washing with the anhydrous ethanol and drying to obtain the hollow tree-like bismuth oxide-bismuth sulfide complex. The invention further relates to an application of the hollow tree-like bismuth oxide-bismuth sulfide complex as a photocatalyst.

The invention relates to a preparation method of bismuth sulfide whisker, which applies hydrothermal synthesis method, and chooses Bi(NO3)3.5H2O, CS(NH2)2 and LiOH as raw materials and H2O as a hydrothermal reaction medium. The method applies LiOH of 1.0 to 1.5M as a mineralizing agent, and the bismuth sulfide whisker can be got by the hydrothermal reaction for 16 hours at a temperature of 200 DEG C. The preparation method provided by the invention can get the bismuth sulfide whisker with an average diameter of 200 to 300nm and the length equals to or above 20Mum, which has wide application prospect in the research fields of thermoelectricity, photoelectricity and infrared spectrum, etc.

The invention relates to a preparation method of a photoelectrochemical sensor for detecting dexamethasone based on in-situ generation of cadmium sulfide. The method specifically comprises the following steps: as carboxylated carbon nitride and bismuth sulfide are taken as substrate materials, and labeling a dexamethasone antibody by using titanium dioxide subjected to cadmium ion functionalization. Sodium sulfide is directly dropwise added to the electrode surface, a narrow band-gap cadmium sulfide semiconductor nanometer material with the high photoelectric conversion efficiency is generated in situ, and a photocurrent signal is generated under light source irradiation with visible wavelength. A porous titanium dioxide carrier and a cadmium sulfide energy band are well matched, so that the photoelectric conversion efficiency of the cadmium sulfide is improved, the high-sensitivity detection of dexamethasone is realized, and the detection limit is 2pg/mL.

The invention relates to a method for improving thermoelectric properties of bismuth sulfide polycrystal and belongs to the technical field of energy materials. The method is characterized by comprising the following steps of: mixing bismuth sulfide nano powder prepared by a mechanical alloying method with (001)-oriented monocrystal bismuth sulfide nanorod powder synthesized by a hydrothermal method, ultrasonically dispersing in absolute ethanol for 10-200 minutes, drying and then manually grinding in an agate mortar for 10-100 minutes; and placing ground powder in a graphite mold, sintering at 300-500 DEG C by adopting a spark plasma sintering process, and maintaining the temperature for 0-30 minutes to prepare a bismuth sulfide polycrystal block. Because the spark plasma sintering process has high heating rate, thus the growth and fusion of crystals are inhibited, the monocrystal nanorod structure is retained in the polycrystal block to form a fast channel for carrier migration, and the electric transmission performance and thermoelectric property of the bismuth sulfide polycrystal are greatly improved; and the method has the advantages of simplicity in required equipment, easiness in operation, low cost, significant effect and the like.

The invention relates to a preparation method of a bismuth sulfide/bismuth molybdenum oxide heterojunction photocatalytic composite material. The preparation method is characterized by comprising the steps of dispersing BiOBr micro-sphere particles in de-ionized water in a proportion of 7.7g/L, and uniformly stirring; adding a molybdenum source: sodium molybdate, sodium chloride, sodium thiocyanate and a surfactant to a solution (1) and stirring for 30-60min; regulating pH value of the solution to be acid through hydrochloric acid; pouring the mixed solution into a stainless steel reaction kettle, and reacting for 24-48 hours at 150-200 DEG C; after reaction, naturally cooling, centrifuging and washing a reaction product for times through de-ionized water and ethanol, and drying the product to obtain the Bi2S3/Bi2MoO6 heterojunction composite material. The preparation method is simple and convenient to operate and is low in reaction temperature, and the prepared composite material is excellent in photocatalytic performance.

The invention discloses a bismuth sulfide nanorod with a CT (computed tomography) angiography function, a nano-composite material and preparation thereof. The preparation method of the bismuth sulfide nanorod comprises the following steps of: (1) dissolving bismuth chloride in a solvent in an ultrasonic manner to get a solution A; (2) dissolving sulfur powder or thiacetamide in the solvent in the ultrasonic manner to get a solution B; and (3) increasing the temperature of the solvent to 80-180 DEG C under the protection of argon, sequentially adding the solution A and the solution B, stirring to realize complete reaction, cooling, and then adding ethanol for centrifugation so as to get the bismuth sulfide nanorod, wherein the solvent is selected from oleyl amine, ethylene glycol and glycerin. The oleyl amine and a metal salt type compound are added into a toluene solution of the bismuth sulfide nanorod, stirring is performed at room temperature, and the ethanol is added for centrifugation so as to get the nano-composite material. The method disclosed by the invention is fast, simple and convenient, and the prepared bismuth sulfide nanorod and the nano-composite material thereof have the advantages of controllable appearance, uniform size and low cost and have excellent CT signals.

A method for separating molybdenum and bismuth sulfide collective concentrate minerals relates to a mineral separation process, in particular to a method for separating the molybdenum and bismuth sulfide collective concentrate minerals to obtain molybdenum concentrate and bismuth concentrate. The invention is characterized in that the floatation separation process adopts bi-hydroxyethyl group amino sodium formate or bi-hydroxyethyl group amino potassium formate as the inhibitor of the bismuth sulfide mineral. The method of the invention efficiently overcomes the defects of large use amount ofcommon sodium sulfide, bad operation environment and heavy pollution, and has the characteristics of convenient adding, safe usage and the like. The invention provides an effective method featuring small medicament use amount, convenient usage and little environment pollution for the separation of molybdenum and bismuth sulfide minerals.

The invention discloses a rodlike bismuth sulfide hollow nanoscale balloon and a preparation method thereof. The preparation method of the rodlike bismuth sulfide hollow nanoscale balloon comprises dispersing monodispersed hierarchical porous structured ZnS nanoscale balloons and thiourea into alcohol solution, stirring and heat-preserving the mixture at 80-130 DEG C for 10 min, then rapidly filling in bismuth salt fully dissolved inside alcohol solution for exposed reaction for 10-30 min, naturally cooling down to room temperature, performing centrifugal washing to obtain the target product of the rodlike Bi2S3 hollow nanoscale balloon. The preparation method for the first time achieves synthesis of the rodlike Bi2S3 hollow nanoscale balloon in solution phase in an exposed system and accordingly is simple in synthesizing method and mild in reaction conditions; the prepared rodlike Bi2S3 hollow nanoscale balloon is uniform in morphology, low in product cost and applicable scaled industrial production.

The invention discloses a method for preparing a bismuth sulfide nano-rod crystalline material, wherein the method is suitable for preparing nano-crystalline materials of bismuth sulfide and other sulfides. The method is characterized in that molten compound nitrate solvent is utilized; the crystalline material is synthesized through chemical reaction under normal pressure and at a temperature of 100-300 DEG C; raw materials used in the method include soluble inorganic metal bismuth salt and sodium sulfide or sulfur powder; the cost during the synthesis is simple; various parameters in the reaction process are easy to monitor and control; little environment pollution is caused; a reaction system has good uniformity; the process is simple and the production can be easily expanded; obtained bismuth sulfide realizes good crystallization, clean surface and uniform size and is suitable for conducting researches on intrinsic properties thereof and bringing the functions of nano-crystalline materials into maximum play.

The invention discloses a highly sensitive paper-based photoelectrochemical sensor for detecting microRNA. A paper chip is prepared by means of a wax printing technology, gold nano-particles are grownin situ in a hydrophilic working area to achieve functionalization of the paper chip, a cuprous oxide/bismuth sulfide/bismuth vanadate tertiary sensitizer is modified subsequently, and microRNA is captured through a fixed hairpin DNA chain; by means of identification of specificity and digestion effect of duplex-specific nuclease, signal amplification on microRNA is achieved, and then by means ofa multibranched hybrid chain, platinum nanoparticles are embedded into a main part of the chain, branch parts form a chlorhematin/G-tetrad structure, and a DNA concatemer with catalase bological characteristics is formed; signal amplification is further achieved, thus preparation of the photoelectrochemical sensor is completed, and highly sensitive and accurate detection on microRNA is achieved.

The invention relates to a bismuth sulfide (Bi2S3) graded nanoflower supercapacitor electrode material and a preparation method. Bi2WO6 graded nanoflowers are dispersed into a thioacetamide solution; after the stirring, the materials are put into a hydrothermal reaction kettle to perform hydrothermal reaction; after the reaction is completed, the materials are naturally cooled to room temperature; precipitates are collected; water and ethyl alcohol are respectively used for alternate washing for three times; centrifugation and drying are performed. The Bi2S3 nanoflowers obtained through in situ topological synthesis by a hydrothermal method have regular appearance, uniform dimension and good dispersibility; compared with a conventional Bi2S3 nanometer material, a Bi2S3 graded structure has the advantages that a greater specific surface area is realized, so that the electric capacity can be effectively improved.

The invention discloses a sulfur group hetero-structure nano material, a preparation method and application thereof. The nano material is Bi2S3/CdS, and the molar ratio of a bismuth source to a cadmium source is 1:1. Compared with the prior art, bismuth sulfide nano wires can be mutually combined with cadmium sulfide nano granules by simple one-step solvent heat, the raw materials are easily obtained, the preparation method is simple, and the yield is 88 percent; and when the material prepared by the method is applied to photocatalytic degradation of organic pollutants such as methyl red dye, the organic pollutants can be basically completely degraded in 20 minutes.

The invention provides core-shell-structure bismuth sulfide@bismuth oxide composite microspheres and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving bismuth nitrate pentahydrate and lysine in a glycol solution, dissolving water-soluble sulfide and lysine in a glycol solution, dropwisely adding the glycol solution containing water-soluble sulfide and lysine into the glycol solution containing bismuth nitrate pentahydrate and lysine, transferring the prepared solution into a crystallization reaction kettle, reacting at 60-160 DEG C in a thermostatic oven for 1-12 hours, cooling, filtering, separating, washing with deionized water, washing with anhydrous ethanol, and drying to obtain bismuth sulfide; and (2) dispersing the prepared bismuth sulfide powder into an alkali solution, transferring the solution into a crystallization reaction kettle, reacting at 60-160 DEG C in a thermostatic oven for 1-24 hours, cooling, filtering, separating, washing with deionized water, washing with anhydrous ethanol, and drying to obtain the core-shell-structure bismuth sulfide@bismuth oxide composite. The invention also provides application of the core-shell-structure bismuth sulfide@bismuth oxide composite microspheres as a photocatalyst.

The invention discloses a preparation method of novel bismuth sulfide nanorods. The preparation method comprises the following steps of: taking bismuth nitrate and glutathione as starting reactants, adopting an alcohol with smaller molecular weight, such as methanol or ethanol as a reaction reagent, performing complete reaction under supercritical conditions of the solvent, then directly discharging the solvent and drying products, namely performing one-step synthesis to obtain bismuth sulfide semiconductor nanorods through a hydro-thermal synthesis method. The method has the advantages of high yield and low cost, the photocatalytic activity of the obtained products is high, and the method has great industrialized application prospects.

The invention relates to a self-lubricating wear-resistant ceramic for cutting tools, which is prepared from the following raw materials in parts by weight: 2-3 parts of bismuth sulfide, 2-3 parts of diethanolamine, 2-3 parts of ammonium sulfate, 2-3 parts of magnesium chloride, 2-3 parts of calcium carbide sludge, 2-3 parts of graphene oxide, 0.6-0.8 part of KOH, 0.2-0.3 part of polyoxyethylene castor oil, 3-4 parts of magnesium oxide, 36-40 parts of titanium boride, 4-5 parts of nano tungsten trioxide, 30-35 parts of titanium carbide, 3-5 parts of beryllium oxide, 1-2 parts of silver powder, a right amount of ethanol, a right amount of deionized water, 1-1.5 parts of polyacrylic acid, 1.2-1.6 parts of polyethyleneglycol and 4-5 parts of antiwear assistant. The added nano tungsten trioxide enhances the high temperature resistance of the ceramic. The ceramic has the characteristics of high temperature resistance, high carrying capacity, self lubrication, thermal shock resistance, high wear resistance and the like, and is suitable for manufacturing cutting tools. The antiwear assistant can enhance the wear resistance and heat resistance of the ceramic.

The invention belongs to the technical field of energy materials, in particular relates to a method for preparing polycrystalline textured thermoelectric materials from single-crystal bismuth sulfide precursor powder. Specifically, the method comprises the following steps of: selecting uniformly-orientated single-crystal bismuth sulfide [Bi2S(3-x), 0<=x<=0.5] powder (including nanoflakes, nanotubes and nanowires) as precursor powder; performing rapid sintering under increased pressure by using a spark plasma sintering technique so that the single-crystal powder trends to be arranged in the direction perpendicular to the pressure and freeze to form highly-textured dense polycrystalline bulk thermoelectric materials; and controlling the texture degree, the crystal grain degree and the density of the bulk materials by adjusting the applied pressure, the sintering temperature and the heat retention time. Owing to the texture, the polycrystalline materials show strong anisotropy, so that the power transmission performance is greatly improved.

The invention discloses a room-temperature water phase preparation method of bismuth sulfide nanospheres. A surfactant is dissolved in de-ionized water, then a chelating agent is added, next bismuth nitrate pentahydrate is added, the materials are stirred at room temperature, sulfur-containing solution is slowly dropwise added into bismuth iron solution, and the materials are uniformly mixed and then react for 2 h at room temperature to obtain the bismuth sulfide nanospheres. The bismuth sulfide nanometer material prepared by the method has good shape and uniform size, and has a potential application value in the fields such as thermoelectricity, electronics and photo-electronic devices; the method has the advantages of simple equipment, mild condition, low energy consumption, short preparation period and easiness in implementation and is an ideal method for preparing the bismuth sulfide nanometer material.

The invention belongs to the technical field of a material and particularly relates to a nanometer bismuth sulfide electrode material with specific morphologic structure, a preparation method thereof and application of nanometer bismuth sulfide electrode material in a lithium ion battery. The bismuth sulfide electrode material provided by the invention is under a spherical or similar spherical secondary particle state formed by clustering the first particles with bar-shaped structures, wherein a gap is arranged between the first particles; the bar lengths of the first particles are 300-500nm; the diameter is 40-80nm; the secondary particles have microcellular structures; the aperture is 1.8-2nm; the specific area is 20-21cm<3>/g. The bismuth sulfide electrode material provided by the invention has relatively small specific area, small impedance and certain rate discharge characteristic. When the bismuth sulfide electrode material is applied to the lithium ion battery, the specific capacity of the lithium ion battery is increased.