20 results about "Silver bromide" patented technology

The invention belongs to the technical field of membrane separation, and particularly discloses a preparation method of a high-flux pollution-resistant silver bromide / polyamide composite reverse osmosis membrane, which comprises the following steps: firstly, depositing a layer of silver bromide nanoparticles on the surface of a polymer porous support layer; then, m-phenylenediamine and trimesoyl chloride are subjected to an interfacial polymerization reaction on the surface of the porous supporting layer deposited with the silver bromide nanoparticles, and a silver bromide / polyamide composite separation layer is formed on the surface of the porous supporting layer; and finally, inducing the nano silver bromide in the composite separation layer to photolyze by utilizing illumination, forming nano pore channels in the separation layer and releasing silver nanoparticles, and preparing to obtain the high-flux pollution-resistant silver bromide / polyamide composite reverse osmosis membrane. According to the reverse osmosis membrane prepared by the method, the water yield can be remarkably increased while the relatively high desalination rate is maintained, and the reverse osmosis membrane has relatively high microbial pollution resistance.

The invention discloses a nano-composite photocatalytic material and a preparation method and application thereof.The preparation method comprises the steps that porous carbon nitride is added into deionized water and stirred, then a silver nitrate solution is added and stirred continuously, then a potassium bromide solution is dropwise added and stirred for a period of time, and the nano-composite photocatalytic material is obtained through filtering, washing, roasting and grinding. The porous carbon nitride and silver bromide nanoparticle composite material is obtained; adding a composite material of porous carbon nitride and silver bromide nanoparticles into deionized water, stirring, then adding the rhenium disulfide quantum dot dispersion liquid, continuously stirring, and then freeze-drying and drying; in the prepared nano composite photocatalytic material, p-g-C3N4 provides stable substrate and basic catalytic activity, AgBr widens the spectral response range and strengthens pollutant adsorption and degradation, ReS2 QDs optimizes charge transfer and improves hydrogen evolution kinetic efficiency, and efficient conversion of solar energy-chemical energy and efficient degradation of organic pollutants are achieved through cooperation of p-g-C3N4, AgBr and ReS2 QDs.

This invention belongs to the technical field of composite nanomaterials and relates to a method for preparing a copper nanocluster-modified silver bromide nanoparticle / titanium dioxide photocatalyst. The method comprises: mixing a copper source and a silver source in deionized water to form a Cu ion-adsorbed AgCl (Cu / AgCl) turbid solution; dispersing TiO2, ascorbic acid, polyvinyl pyrrolidone, and potassium bromide in the deionized water by ultrasonication, transferring the solution to an oil bath, stirring and heating the solution, adding the Cu / AgCl turbid solution for reaction, and washing to remove impurities. The method is applied to the photocatalytic conversion of CO2 and H2O to produce C2H4 and H2O2. The Cu nanocluster-modified AgBr nanoparticles are directionally attached to a TiO2 substrate through an ion exchange process enhanced by electrostatic interactions. Utilizing the spatially confined structure, the Cu / AgBr / TiO2 ternary hybrid structure has a cascaded multi-step charge transfer mechanism, which provides a strong charge driving force for the catalyst. In addition, the adjacent heteronuclear sites of Cu and Ag provide an excellent synergistic catalytic effect for the entire reaction, realizing the light-driven conversion of CO2 and H2O to C2H4 and H2O2.

The application discloses a cesium copper bromide-silver bromide heterojunction photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalytic material for preventing and treating air pollution. The preparation method comprises the following steps: dissolving cesium bromide and copper bromide in dimethyl sulfoxide, and obtaining cesium copper bromide by using an anti-solvent recrystallization method; dispersing the cesium copper bromide into an isopropyl alcohol solution, adding a silver nitrate-isopropyl alcohol solution, sealing the obtained mixed solution, continuously stirring under light irradiation, and obtaining the cesium copper bromide-silver bromide heterojunction photocatalyst through centrifugation, washing and drying. The cesium copper bromide-silver bromide heterojunction photocatalyst provided by the application has stronger photocatalytic reduction capacity, and can greatly improve the activity of the cesium copper bromide-silver bromide in photocatalytic reduction of carbon dioxide.

The invention discloses a wear-resistant electromagnetic shielding fabric and a preparation method thereof, and relates to the technical field of fabrics. The preparation method comprises the following steps: quaternizing 2-bromomethyl methacrylate to obtain quaternary ammonium bromide, polymerizing the quaternary ammonium bromide with glycidyl methacrylate, combining silver bromide on a resin side chain by using an in-situ precipitation method, carrying out synergistic antibacterial action with quaternary ammonium salt, and carrying out electrostatic spinning to obtain the modified quaternary ammonium methyl methacrylate fiber. The fabric twisted by the modified quaternary ammonium methyl methacrylate fibers and the cotton fibers is soaked in the modification treatment liquid, citric acid in the modification treatment liquid excites carboxylation of the cotton fibers, deposition of carbon nanotubes in the modification treatment liquid is facilitated, chemical bonds among the fibers are combined, and therefore the fabric is endowed with better wear resistance and shielding performance. The prepared fabric has wear-resistant, electromagnetic shielding and antibacterial effects.

The present application provides a kind of high C 2+ The application discloses a preparation method, product and application of a selective carbon dioxide electro-reduction catalyst Ag / AgBr / Cu2O. The preparation method adopts a one-pot solvothermal reduction method, and by controlling the reaction conditions, silver species is synchronously generated in the form of metallic silver and silver bromide and firmly combined with a cuprous oxide substrate. The method route is simple, the reaction conditions are mild, and the product is controllable. When the obtained catalyst is applied to a carbon dioxide electro-reduction reaction, the introduction of Ag and the doping of Br in the catalyst produce a synergistic catalytic effect, effectively promote the C-C coupling path, and significantly improve the C 2+ product selectivity, the C 2+ product faraday efficiency reaches 82.7%, and the local current density reaches 121.7 mA·cm ‑2 -2. At the same time, the hydrogen evolution side reaction is effectively inhibited. The research provides a new idea for designing a high-performance CO2 conversion catalyst, and has important scientific value and industrial application potential.

The invention belongs to the technical field of phase-change materials, and particularly discloses a high-suspension double-shell phase-change nanocapsule and a preparation method and application thereof, and the preparation method comprises the following steps: S1, preparing a water phase; s2, preparing an oil phase; s3, emulsifying: adding the oil phase into the water phase, and performing ultrasonic treatment; s4, polymerization: magnetically stirring, raising the temperature, and adjusting the pH value; s5, depositing silver bromide particles: mixing with deionized water, adding cetyltrimethylammonium bromide and potassium bromide, uniformly stirring, then adding silver nitrate, and stirring; and S6, forming a silver shell: adding hydroquinone, performing primary stirring, continuing to add the citric acid buffer solution and silver nitrate, and performing secondary stirring to grow the silver shell. According to the high-suspension-property double-shell phase change nanocapsule and the preparation method and application thereof, the density of the inner shell is low, the density of the outer silver shell is thin, the density of the nanocapsule can be reduced, the suspension stability of the capsule in fluid can be enhanced, the thermal response speed of the capsule can be increased, and the thermal response time can be shortened.

The invention discloses a waterproof and antioxidant nuclear medicine dry printing film and a preparation method thereof, and relates to the technical field of printing films. The printing film adopts a three-layer structure of a bottom coating, a nuclear-sensitive imaging layer and a waterproof anti-oxidation layer. The preparation method comprises the following steps: pretreating a PET film, and coating and curing each coating. The bottom coating liquid contains hydroxyl acrylic resin, an isocyanate curing agent, nano silicon dioxide particles and ethyl acetate, and the core-sensitive imaging layer coating liquid takes gelatin and silver bromide as cores and is added with benzotriazole, sodium sulfite, polyethylene glycol diglycidyl ether and a fluorocarbon surfactant. The waterproof anti-oxidation coating liquid is prepared from polyvinylidene fluoride resin, an ethylene trifluorochloroethylene copolymer, nano titanium oxide particles and the like. The printing film has excellent surface performance, high image resolution and good long-term storage stability, and can meet the requirements of nuclear medicine clinical diagnosis and long-term archiving.

This invention belongs to the field of photocatalytic materials technology, specifically relating to a manganese ferrite / silver hexabromobismuthate dicesium heterojunction photocatalyst, its preparation method, and its application. The mass ratio of manganese ferrite to cesium hexabromobismuthate dicesium heterojunction photocatalyst is 1:3 to 1:7. The preparation method includes: dissolving manganese chloride and ferric chloride hydrate in deionized water, then adding sodium hydroxide, and obtaining manganese ferrite using a hydrothermal method; dissolving silver bromide and bismuth bromide in hydrobromic acid, heating in an oil bath, then adding cesium bromide, and obtaining cesium hexabromobismuthate dicesium using an acid precipitation method; and dissolving manganese ferrite and cesium hexabromobismuthate dicesium in an ethanol solution, and obtaining the manganese ferrite / silver hexabromobismuthate dicesium heterojunction photocatalyst using a mechanical stirring method. The formation of the heterojunction can significantly improve the photocatalytic reduction activity of carbon dioxide by manganese ferrite / silver hexabromobismuthate dicesium.

The invention discloses a method for extracting and converting bromine ions dissolved in a water body and detecting stable bromine isotopes, and belongs to the field of isotope detection methods. The method comprises the following steps: oxidizing bromide ions in a water body by using acidic sodium dichromate based on the oxidation-reduction characteristic of the bromide ions in the water body to obtain bromine gas, reacting the bromine gas with an alkaline solution to obtain sodium bromide, adding silver ions into the solution to generate silver bromide precipitates, drying the precipitates, quantitatively putting the precipitates into a jaw headspace bottle in a dark environment, and adding methyl iodide; reacting under optimized conditions to generate methyl bromide gas; a gas isotope mass spectrometer and a gas chromatograph which are provided with receiving cups with the mass numbers of 94 and 96 are used in a combined mode, interference of impurity gas is eliminated through modified Isolink II equipment, after bromomethane mixed gas is separated through a chromatographic column, the impurity gas is emptied, bromomethane enters the mass spectrometer, and the bromine isotope ratio is accurately measured. The method can be used for evaluating and researching sources, causes and formation hydrogeochemical and physical processes of oil field water, underground brine, salt water and the like.

The invention provides a silver-based metal halide microcrystal, a preparation method thereof and application of the microcrystal in a deep ultraviolet photoelectric detector, and belongs to the technical field of semiconductor nanomaterials. The preparation method comprises the following steps: dissolving cesium bromide and silver bromide by adopting dimethyl sulfoxide and N, N-dimethyl formamide to form a precursor saturated solution, coating the precursor saturated solution on the surface of a carrier, and in an anti-solvent evaporative crystallization process, influencing the supersaturation degree of the precursor saturated solution by utilizing methanol to drive the solute of the precursor saturated solution to separate out CsAgBr2 crystals, thereby obtaining the CsAgBr2 / CsAgBr2 / CsAgBr2 / CsAgBr2 / CsAgBr2 / CsAgBr2 composite material. Obtaining a carrier loaded with a precursor crystal; the carrier loaded with the precursor crystal is annealed, so that the internal stress of the precursor crystal can be released, the crystallinity of the precursor crystal is improved, and the crystallization quality of the silver-based metal halide microcrystal is improved. The method provided by the invention is simple and convenient to operate, does not need expensive equipment, ultrahigh vacuum and other harsh conditions, is easier to control and implement in the preparation process, and is beneficial to large-scale production.

The present application relates to the field of environmental protection, in particular to an indoor high-efficiency antibacterial odor-removing agent, a preparation method and application, the removing agent comprising a composite antibacterial agent, silver bromide-silver / nano silicon, a hydrogel, a wetting agent, a defoaming agent, and the balance water; the composite antibacterial agent is a wood moldin C4 ester derivative and / or a copper-loaded zinc oxide nano material; the silver bromide-silver / nano silicon is formed by loading silver-silver bromide on nano silicon sheets. The present application has excellent environmental adaptability, and has obvious antibacterial properties under the conditions of natural light, weak light or no light, has broad-spectrum, high-efficiency and rapid sterilization effect, the killing rate of bacteria and viruses is mostly above 99%, and fungi are inhibited and cannot grow; and under visible light, the present application can play an excellent role in decomposing formaldehyde and removing odor molecules, reducing the release of formaldehyde from the substrate itself, purifying and decomposing formaldehyde and odor molecules in the air, and can maintain effectiveness for a long time, continuously purifying indoor air; the raw materials are non-toxic and have no side effects, and are safe and environmentally friendly.

The present application relates to the technical field of variable color glass, and particularly relates to a preparation method of laminated glass with good comprehensive performance, comprising the following steps: S1: respectively grinding 3 parts by weight of silver bromide, 7 parts by weight of silver chloride, 9 parts by weight of inorganic photochromic powder and 2 parts by weight of aluminum oxide into 8-micron particles through a superfine dry grinding machine; S2: adding the ground silver bromide, silver chloride, inorganic photochromic powder and aluminum oxide into a mixture of 150 parts by weight of QIS-5705 elastic sealant and chloroprene glue, and stirring to form a transparent water paste mixture A; S3: wet grinding the mixture A, and grinding the mixture A into 0.1-micron paste; the preparation method is simple, integrates the advantages of light modulation, ultraviolet protection, heat insulation and energy saving, high weather resistance, decoration and the like, is an important glass material for assisting the high-end green development of the building, automobile and the like industries, is in line with the new mode under the background of "double carbon", and has good market prospect.

This invention provides a multifunctional seawater-resistant dressing and its preparation method. The dressing comprises, from bottom to top, a hemostatic and absorbent layer, an antibacterial layer, a waterproof self-adhesive layer, and a release layer. The hemostatic and absorbent layer is prepared from raw materials including a hemostatic agent, N-isopropylacrylamide, acrylic acid, and a crosslinking agent. The antibacterial layer is formed by electrospinning bismuth tungstate / silver bromide heterojunction nanoparticles and a polymer solution, with a material-to-liquid ratio of bismuth tungstate / silver bromide heterojunction nanoparticles to the polymer solution of 5:1 mg / mL. The dressing prepared by this invention effectively prevents seawater immersion and exhibits excellent hemostatic and antibacterial effects.

The invention discloses a cesium copper bromide-silver bromide heterojunction photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of air pollution prevention and control of photocatalytic materials. The preparation method comprises the following steps: dissolving cesium bromide and copper bromide in dimethyl sulfoxide, and obtaining cesium copper bromide by using an anti-solvent recrystallization method; the preparation method comprises the following steps: dispersing cesium, copper and bromine into an isopropanol solution, adding a silver nitrate-isopropanol solution, sealing the obtained mixed solution, continuously stirring under the condition of illumination, centrifuging, washing and drying to obtain the cesium, copper and bromine-silver bromide heterojunction photocatalyst. The cesium-copper-bromine-silver bromide heterojunction photocatalyst provided by the invention has stronger photocatalytic reduction capability, and the activity of the cesium-copper-bromine-silver bromide for photocatalytic reduction of carbon dioxide can be greatly improved.

The application belongs to the technical field of photocatalytic materials, and particularly relates to a hexabismuth bismuth silver acid dicyesium / metal organic framework MIL-53Fe heterojunction photocatalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving iron chloride hexahydrate and 1,4-benzenedicarboxylic acid in dimethylformamide, and obtaining a metal organic framework MIL-53Fe by using a hydrothermal method; dissolving silver bromide and bismuth bromide in preheated hydrobromic acid, then adding cesium bromide, and obtaining hexabismuth bismuth silver acid dicyesium by using an acid precipitation method; dissolving the metal organic framework MIL-53Fe and the hexabismuth bismuth silver acid dicyesium in anhydrous ethanol, and obtaining the hexabismuth bismuth silver acid dicyesium / metal organic framework MIL-53Fe heterojunction photocatalyst by using a mechanical stirring method. The formation of the heterojunction can greatly improve the photocatalytic reduction activity of the hexabismuth bismuth silver acid dicyesium / metal organic framework MIL-53Fe on carbon dioxide.

A coating composition containing silver ions and an isothiazolinone derivative as antimicrobial agents, wherein the silver ions and the isothiazolinone derivative are homogeneously dispersed in a liquid matrix and their total concentration is not more than 10% by weight of the matrix, and further the weight ratio of silver ions, calculated as elemental silver, to isothiazolinone derivative is 1:50 to 50:1, wherein the isothiazolinone derivative is selected from the group consisting of 2-n-octyl-4-isothiazolin-3-one and 2-octyl-2H-isothiazolin-3-one and / or salts thereof, and further wherein the silver ions are contained as a silver salt, wherein the silver salt is selected from silver carboxylates, silver fluoride, silver bromide, silver phosphate, silver phosphate glass, silver iodide, silver carbonate, and any combination of the aforementioned silver salts.

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a method for preparing a photocatalytic material by using a synthesis environment composed of a dihydrogen bond system. The preparation method comprises the following steps: firstly, uniformly mixing a deep eutectic solvent and nanocellulose to obtain a solution, then sequentially dropwise adding aqueous solutions of silver nitrate and potassium bromide into the mixed solution for reaction, and adjusting the pH value for reaction. And after the reaction is finished, washing with deionized water and ethanol to finally obtain the silver bromide photocatalytic material with rock-like morphology. The preparation method is simple, environment-friendly and economical; the prepared photocatalytic material has excellent photocatalytic performance, and the degradation rate of RhB reaches 90%-99% within 30 min.

The invention discloses intelligent dimming glass based on a photochromic effect and a preparation method thereof, and relates to the field of dimming glass, and the preparation method comprises the following steps: S1, preparing 0.8 g of silver bromide, 2 g of Arabic gum, 0.3 g of copper oxide, 600-mesh waterproof abrasive paper, 5 cm * 5 cm glass, distilled water not less than 100 ml, a hydrochloric acid solution and spraying equipment; according to the intelligent dimming glass based on the photochromic effect and the preparation method of the intelligent dimming glass, the transparency is reduced when sunlight is strong, excessive light is prevented from entering a room, glare and heat are reduced, the transparency is increased in cloudy days or when the indoor light is dark, sufficient lighting is guaranteed, a comfortable indoor illumination environment is created, and the visual experience of a user is improved; and discomfort caused by too strong or too dark light is reduced.

This invention belongs to the field of functional polymer nanocomposite materials technology, specifically relating to an antibacterial and biodegradable composite material, its preparation method, and its applications. This invention achieves synergistic antibacterial effects through a core-shell structure design, combining photocatalytic sterilization with controlled, sustained release of silver ions. The gold shell stabilizes the silver bromide core and promotes the separation of photogenerated carriers. The surface treatment agent system addresses the issues of nanoparticle aggregation and interfacial compatibility. The final product possesses advantages such as highly efficient, broad-spectrum, and long-lasting antibacterial properties, stable mechanical properties, and green biodegradability. The process is mild and controllable, easily scalable for industrial application, and can be widely used in the production of antibacterial and biodegradable plastic products such as food packaging films, medical dressings, and daily necessities.