95 results about "Potassium bromide" patented technology

The invention provides MAB-phase ceramic powder as well as a preparation method and application thereof, and belongs to the technical field of ceramic materials. Firstly, elementary substance M powder and boron powder serve as raw materials, and MB powder is prepared through ball milling treatment, tabletting, heat treatment and grinding; the simple substance M powder is selected from transition metal powder; the preparation method comprises the following steps: by taking MB powder and aluminum powder as raw materials, carrying out wet ball-milling treatment, compression molding, packaging and sintering treatment to prepare MAB-phase ceramic powder; the packaging is carried out by adopting potassium bromide powder. According to the invention, an MS3-fused salt shielding synthesis / sintering method is adopted, salt is used as a reaction medium and a salt bed, the exterior of a sample is packaged with salt, so that a synthetic product is prevented from being oxidized during high-temperature synthesis in the air, and the preparation method has the characteristics of rapidness, high efficiency, energy conservation, environmental protection, low cost and the like, and is simple, convenient and feasible in the aspect of promotion of large-scale production.

The present invention discloses a method for synthesizing 9-bromoanthracene. Anthracene and potassium bromide are used as raw materials. The final product, 9-bromoanthracene, is obtained by reacting anthracene and potassium bromide in the presence of ferric chloride and 1-acetoxy-1,2-benzidoxyl-3-(1H)-ketone. The method has the advantages of being inexpensive and readily available, easy to produce, and readily purifiable, and can be developed into an industrialized production method.

The invention belongs to the technical field of unsaturated polyester resin materials, and particularly relates to an unsaturated polyester resin material containing a potassium bromide composite accelerant and a preparation method of the unsaturated polyester resin material. The unsaturated polyester resin material containing the potassium bromide composite accelerant comprises the following raw materials: unsaturated polyester resin, the composite accelerant and an initiator, the unsaturated polyester resin is prepared from the following raw materials: dihydric alcohol, saturated dibasic acid, unsaturated dibasic acid, a polymerization inhibitor, an antioxidant and styrene. According to the unsaturated polyester resin material containing the potassium bromide composite accelerator, the composite accelerator is adopted to catalyze isomerization crosslinking of the unsaturated polyester resin, so that the curing speed of the unsaturated polyester resin is increased, the production efficiency is ensured, and the production cost is reduced; the bending strength and the bending modulus of the product prepared by adopting the composite accelerant are improved, and the impact resistance of the product is enhanced; the invention further provides a preparation method, and the preparation process is simple.

The invention relates to an absorbable bone hemostasis and repair stent. The absorbable bone hemostasis and repair stent comprises the following raw materials in parts by weight: 15-60 parts of an excipient, 15-60 parts of a softening agent and 5-70 parts of a bone repair promoting component, the excipient is prepared from a polyoxyethylene-polyoxypropylene copolymer; the softening agent comprises a semi-solid mobile phase polymer; the bone repair promoting component comprises a coating and a core, the coating comprises a polylactic acid-glycolic acid copolymer, zinc stearate and potassium bromide, the core comprises calcium phosphate particles, and the coating wraps the surface of the core. The preparation method comprises the following steps: preparing the bone repair promoting component; and preparing the absorbable bone hemostasis repair stent. The absorbable bone hemostasis and repair stent is high in hemostasis and collapse resistance and has good inflammation regulation and bone repair promoting effects. The absorbable bone hemostasis and repair stent can be used for bone hemostasis and bone repair promotion of any bone injury wound.

The invention belongs to the technical field of electrochemical energy storage, and discloses an electrolyte for a zinc-bromine flow battery, a preparation method of the electrolyte and the zinc-bromine flow battery, raw materials of the electrolyte comprise the following components: zinc salt, potassium salt, an additive and a solvent; the potassium salt is a compound mixture of potassium bromide and potassium bromate; the additive comprises an organic complexing agent and an inorganic corrosion inhibitor; wherein the organic complexing agent comprises an organic zinc complexing agent and an organic bromine complexing agent; the organic zinc complexing agent is crown ether; the organic bromine complexing agent is imidazole bromine salt or pyridine bromine salt; the inorganic corrosion inhibitor is a compound of sodium molybdate, zinc sulfate, sodium dihydrogen phosphate and deionized water; growth of zinc dendrites can be remarkably inhibited, the energy density of the battery is improved, and escape of hydrogen bromide is effectively prevented, so that the performance and the stability of the zinc-bromine flow battery are comprehensively improved, the service life of the battery is prolonged, and the use cost and the safety risk of the battery are reduced.

The invention relates to a preparation method and application of an ultra-efficient nitrate-based free radical activation catalyst, and the preparation method comprises the following steps: S1, dissolving bismuth nitrate Bi (NO3) 3.5 H2O and polyvinylpyrrolidone (PVP) in a mannitol solution; s2, adding potassium bromide into the solution in the step S1, and performing ultrasonic treatment to form a white suspension; s3, transferring the suspension into a high-pressure reaction kettle for hydrothermal reaction; and S4, after the reaction is completed, cooling, centrifugally collecting precipitates, washing, and carrying out vacuum freeze drying to obtain the bismuth oxybromide BixOBr nanosheet catalyst. According to the application of the super-efficient nitrate-based free radical activation catalyst in degradation of organic pollutants, the bismuth oxybromide BixOBr nanosheet catalyst is added into a water body containing nitrate, the nitrate is activated to generate free radicals by utilizing the piezoelectric effect induced by photoinduced deformation of the photocatalyst under the condition that an external electric field and an oxidizing agent are not needed, and the degradation efficiency of the nitrate-based free radical activation catalyst is improved. Therefore, organic pollutants are degraded.

This invention discloses a method for preparing a Bi3O4Br catalyst for the efficient degradation of tetracycline, comprising the following steps: S1, mixing bismuth nitrate and potassium bromide in an aqueous solution at room temperature, stirring, and filtering after the reaction to obtain a precipitate; S2, washing and drying the obtained precipitate to obtain a BiOBr precursor; S3, placing the obtained BiOBr precursor in a sodium hydroxide solution of a certain concentration and reacting at a certain temperature to obtain the Bi3O4Br catalyst. Experimental results show that the Bi3O4Br catalyst has a larger specific surface area and more photocatalytic active sites than pure Bi3O4Br, and has a higher oxygen vacancy (OV) concentration, exhibiting high catalytic activity in the photocatalytic degradation of tetracycline. This photocatalyst has broad practical value and application prospects.

The invention relates to the technical field of instrument analysis, and particularly discloses a biconvex lens type diffuse reflection accessory which comprises a shell, a sample table, a biconvex lens dome and two sets of reflector assemblies, light beam channel holes are symmetrically formed in the two sides of the shell, the sample table is fixed in the shell through a positioning pin, and the biconvex lens dome and the sample table form a closed cavity. Convex lens window sheets made of zinc selenide / potassium bromide are symmetrically arranged on the two sides of the substrate; the reflector assembly is composed of an irregular trapezoid base and a wedge-shaped base which are installed on the bottom face and the top face of the shell, the irregular trapezoid base and the wedge-shaped base bear gold-plated plane reflectors respectively, two times of total reflection and focusing of incident light beams are achieved, and diffuse reflection light on the surface of a sample is recycled. Compared with the prior art, the device has the advantages of low cost, small size, simplicity and convenience in operation and maintenance and the like.

The invention discloses a preparation method and application of high-fluorescence quantum yield perovskite fluorescent powder based on amino acid, and belongs to the technical field of luminescent materials and display, the preparation method is used for preparing the perovskite fluorescent powder, and the preparation method comprises the following steps: dissolving potassium bromide in deionized water, then adding lead bromide, and carrying out ultrasonic dissolution to obtain a first solution; dissolving cesium bromide in another deionized water to obtain a second solution; mixing the first solution and the second solution, and standing to obtain a mixed solution; dropwise adding the mixed solution into absolute ethyl alcohol, and stirring to obtain a precursor solution; adding amino acid into the precursor solution, and stirring to obtain a precursor reaction suspension; and centrifuging the suspension, collecting the precipitate, centrifugally washing the precipitate with absolute ethyl alcohol, and drying the washed precipitate to obtain the perovskite fluorescent powder. The invention provides a green synthesis method of a water-ethanol system, which is combined with an amino acid synergistic passivation effect to realize low-cost preparation and improvement of luminous efficiency.

The application is suitable for the technical field of nanometer material synthesis and application, and provides a preparation method of crystalline PdCN@amorphous PdP core-shell nanoparticles, which comprises the following steps: polyvinylpyrrolidone, L-ascorbic acid and potassium bromide are added into deionized water to form a mixed solution, after preheating of an oil bath, sodium chloropalladate solution is injected, and then transferred to the oil bath for reaction, and after centrifugation and cleaning, cubic Pd nanoparticles are obtained; the cubic Pd nanoparticles are dissolved in dimethyl sulfoxide solution, transferred to a reaction kettle for reaction, and after centrifugation and cleaning, cubic PdCN nanoparticles are obtained; the cubic PdCN nanoparticles are mixed with oleylamine solution, and after adding trioctylphosphine solution and heating, centrifugation and cleaning, the crystalline PdCN@amorphous PdP core-shell nanoparticles are successfully obtained. The reagents used in the application can be purchased on the market and do not need further treatment, the preparation method is simple, and the required equipment is all basic laboratory equipment, without expensive equipment and instruments.

The present invention discloses a Ru-Cu amorphous nano-alloy for a lithium carbon dioxide battery cathode catalyst and a preparation method thereof, wherein the morphology is a lamellar nanostructure with a thickness of 5 to 100 nm. The preparation method is as follows: ruthenium acetylacetonate, copper acetylacetonate and potassium bromide are dissolved in a mixed solution of ethanol and water to obtain a light red liquid after complete dissolution; the liquid is dried at 80 to 100 ° C for 8 to 16 hours to obtain a solid powder; in an air atmosphere, calcined at 260 to 280 ° C for 60 to 120 minutes, followed by natural cooling; finally, it is obtained by grinding, washing and drying. The Ru-Cu amorphous nano-alloy obtained by the present invention can be used to prepare a lithium carbon dioxide battery cathode, which can greatly increase the decomposition rate of lithium carbonate, solve the key problems such as high charging voltage and low energy efficiency of lithium carbon dioxide batteries, and achieve the purpose of improving the charge and discharge performance of lithium carbon dioxide batteries.

The present invention belongs to the technical field of unsaturated polyester resin materials, and specifically relates to an unsaturated polyester resin material containing a potassium bromide composite accelerator and a preparation method thereof. The unsaturated polyester resin material containing a potassium bromide composite accelerator comprises the following raw materials: an unsaturated polyester resin, a composite accelerator, and an initiator; the unsaturated polyester resin is composed of the following raw materials: a diol, a saturated dibasic acid, an unsaturated dibasic acid, an inhibitor, an antioxidant, and styrene. The unsaturated polyester resin material containing a potassium bromide composite accelerator of the present invention uses a composite accelerator to catalyze the isomerization and cross-linking of the unsaturated polyester resin, thereby increasing the curing speed of the unsaturated polyester resin, ensuring production efficiency, and reducing production costs; the product prepared using the composite accelerator has improved flexural strength and flexural modulus, and the impact resistance of the product is enhanced; the present invention also provides a preparation method thereof, and the preparation process is simple.

The invention relates to the technical field of electrocatalysis, in particular to a defect-rich cobaltosic oxide electrocatalyst and a preparation method and application thereof.The preparation method includes the steps that cobalt nitrate and di-methylimidazole are dissolved and centrifuged through solvation to obtain a precursor, then the precursor and potassium bromide are annealed together, finally, washing is conducted, and the defect-rich cobaltosic oxide electrocatalyst is obtained; the defect-rich cobaltosic oxide electrocatalyst can be obtained through vacuum drying, and the defect-rich cobaltosic oxide electrocatalyst has excellent water desorption oxygen desorption reaction electrocatalytic activity and stability and has the potential of large-scale industrial application.

The invention discloses a palladium-platinum-copper ternary alloy nano hollow frame, a preparation method thereof and application of the palladium-platinum-copper ternary alloy nano hollow frame in uric acid degradation catalysis. The preparation method comprises the following steps: synthesizing palladium nano solid cubic particles; depositing platinum atoms on the surface of the palladium-platinum nano cubic particle to form a palladium-platinum nano cubic particle with a core-shell structure; selectively etching a palladium core through an aqueous solution system of ferric chloride, potassium bromide and hydrochloric acid to obtain a palladium-platinum nano hollow frame; the palladium-platinum-copper ternary alloy nano hollow frame is obtained through co-deposition of platinum atoms and copper atoms in different proportions on the palladium-platinum nano hollow frame. The palladium-platinum-copper ternary alloy nano hollow frame material with different element proportions and a complex fine structure is prepared through adjustable and controllable simple preparation steps, and the palladium-platinum-copper ternary alloy nano hollow frame material has an appropriate size and high uric acid degradation catalysis activity and becomes a nano functional mimic enzyme material capable of being applied to biological uric acid degradation.

This invention discloses a photoelectrocatalyst and its preparation method, wherein the photoelectrocatalyst comprises Zn 2+ Ce 4+ Au; Zn 2+ Including ammonium acetate, zinc nitrate, and hexamethylenetetramine; Ce 4+ Including cerium nitrate, ammonium chloride, and potassium chloride; Au includes PVP, sodium citrate, potassium bromide, and chloroauric acid; Zn 2+ Ce 4+ The molar ratio of Au to Zn is... 2+ Ce 4+ Au = 1:0.5 ~ 1:2.5 * 10 ‑7 ~7.5*10 ‑7 This method uses electrodeposition to prepare ZnO as a substrate. Its vertically aligned one-dimensional (1D) nanostructures exhibit quantum size-dependent effects, effectively shortening the carrier diffusion distance. CeO2 coats the ZnO, forming a stable, acid- and alkali-resistant substrate material. CeO2 traps electrons from Ce... 4+ Restored to Ce 3+ This forms oxygen voids and Ce 3+ / Ce 4+ Electron pairs produce high catalytic activity.

The present application relates to a kind of for CO2 reduction CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst and its preparation method, the preparation method has the following steps: with bismuth oxychloride and lead nitrate is added to aqueous solution, freeze-drying after ultrasonic, by muffle furnace calcination, obtain precursor material;CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst is obtained by two-step calcination method again by adding cesium bromide and potassium bromide, dissolving, ultrasonic, freeze-drying, by muffle furnace calcination its feature is.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared has excellent performance and good cycle stability.The drug used in preparation is easily obtained and low in price, and preparation is simple and short in time.CsPbBr3 quantum dot / BiOCl heterojunction photocatalyst prepared can be successfully applied in the field of photocatalytic CO2 reduction.

The invention belongs to the technical field of air pollution prevention and control of photocatalytic materials, and particularly relates to a nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) respectively dissolving ammonium sulfate, bismuth nitrate and potassium bromide in water, mixing and transferring into polytetrafluoroethylene, and obtaining nitrogen-doped bismuth oxybromide by utilizing a hydrothermal method; 2) adopting a hydrothermal-assisted thermal polymerization method, obtaining a precursor through a melamine hydrothermal reaction, and performing nitrogen calcination to obtain tubular graphite-phase carbon nitride; 3) adding the mixed sample into methanol, and adopting a mechanical stirring method to obtain the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride heterojunction photocatalyst. Due to the formation of the heterojunction, the activity of the nitrogen-doped bismuth oxybromide-graphite phase carbon nitride in photocatalytic reduction of carbon dioxide can be greatly improved.

The invention relates to a qualitative and quantitative method for liensinine perchlorate. The qualitative method comprises the following steps: weighing 1mg of liensinine perchlorate and 1mg of liensinine, uniformly grinding and tabletting the liensinine perchlorate and the liensinine with 100mg of potassium bromide respectively, acquiring an infrared spectrum of 4000-400cm <-1 > by adopting an infrared spectrometer, and comparing spectrograms to find that the peak shapes of the liensinine perchlorate and the liensinine are similar, the peak shapes of the liensinine perchlorate and the liensinine perchlorate are common characteristic peaks and the peak shapes of the liensinine perchlorate are unique characteristic peaks of the liensinine perchlorate and the liensinine are common characteristic peaks and the peak shapes of the The quantitative method comprises the following steps: weighing a series of liensinine perchlorate reference substances with different masses, uniformly grinding and tabletting the liensinine perchlorate reference substances and 100mg of potassium bromide respectively, collecting an infrared spectrum, carrying out integration on a 625cm <-1 > characteristic peak to obtain a peak area, and drawing a standard curve by taking the peak area as a vertical coordinate and taking the sampling mass of the reference substances as a horizontal coordinate; the method comprises the following steps: weighing a sample to be detected, collecting an infrared spectrum, integrating a 625cm <-1 > characteristic peak to obtain a peak area, substituting the peak area into the standard curve equation, calculating the mass of the liensinine perchlorate in the sample, and substituting the mass into the content calculation formula to obtain the content of the liensinine perchlorate in the sample. The method is good in precision, repeatability and stability, wide in linear range, high in linear correlation coefficient and high in recovery rate, the problem that liensinine interference cannot be avoided in an existing content determination method is effectively solved, whether liensinine perchlorate is generated or not can be qualitatively judged, and the quantity of liensinine perchlorate generated can be quantitatively detected; and a feasible new method is provided for production process optimization and quality evaluation of liensinine perchlorate.

The invention discloses a method for measuring main components of a calcined nacre mother medicinal material before and after irradiation, which comprises the following steps: (1) preparation of a test sample: weighing the irradiated calcined nacre mother, adding potassium bromide, putting into an agate mortar, uniformly grinding under an infrared lamp to obtain mixed powder, transferring the mixed powder into a mold, transferring the mold to a tablet press, vacuumizing, pressurizing, and drying to obtain the test sample; a test sample is obtained; (2) preparation of a reference substance: weighing calcined mother-of-pearl before irradiation, adding potassium bromide, placing in an agate mortar, uniformly grinding under an infrared lamp to obtain mixed powder, transferring the mixed powder into a mold, transferring the mold to a tablet press, vacuumizing and pressurizing to obtain the reference substance; and (3) determining the fingerprints of the test sample and the reference substance by using an infrared spectrometer method, and carrying out fingerprint change analysis. The method is of great significance to quality research before and after irradiation of the calcined mother-of-pearl and guarantee of the curative effect of the product.

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 field of catalysis technology, specifically relating to a method for preparing cyclopentane derivatives from furan compounds. The method includes the following steps: mixing a furan compound, a copper-based catalyst, a halogen modifier, and a first solvent, and reacting them under a hydrogen atmosphere; the halogen modifier is at least one selected from sodium chloride, sodium bromide, potassium chloride, potassium bromide, chlorobenzene, and bromobenzene. This invention, by adding a halogen modifier to the catalytic system, introduces halogen components onto the surface of the copper-based catalyst to construct Cu-halogen active centers, achieving highly selective rearrangement of furan compounds into cyclopentane derivatives under relatively mild conditions, while significantly suppressing condensation side reactions, improving carbon utilization efficiency, and reducing dependence on the type of support.

The invention relates to the technical field of pesticide production, in particular to a method for purifying byproduct salt in pesticide production, which comprises the following steps of: dissolving the synthesized pesticide byproduct potassium bromide solid salt with pure water according to the content of 20-50%; hydrobromic acid is added in the dissolving process to adjust the pH value to 3.5-5, and carbonate radicals and bicarbonate radicals in water are removed; after the reaction is completed, stopping aeration and standing, skimming floating glue by adopting an air flotation machine, performing coarse filtration by using a filter bag, and then passing through a ceramic membrane; carrying out coagulative precipitation on the ceramic membrane concentrated water, and carrying out electrochemical experiment to remove COD (Chemical Oxygen Demand) on the supernatant after the coagulative precipitation; electro-catalytic oxidation effluent is returned to the ceramic membrane part for continuous treatment; the pH value of the ceramic membrane clear liquid is adjusted to 7-8 with potassium hydroxide, and then evaporative crystallization is carried out, so that the technical problems that in the prior art, in the process of generating difenoconazole through condensation, the byproduct potassium bromide is difficult to separate, the resource waste is serious, the purity is low, the separation and purification cost is relatively high, and meanwhile, a large amount of wastewater is generated and is difficult to treat are solved.

The present application relates to a kind of absorbable bone hemostasis repair bracket, the absorbable bone hemostasis repair bracket includes the following weight parts of raw materials: excipient 15~60 parts, softening agent 15~60 parts and promote bone repair component 5~70 parts;The excipient includes polyoxyethylene-polyoxypropylene copolymer;The softening agent includes semi-solid mobile phase polymer;The promote bone repair component includes coating and core, the coating includes polylactic acid-glycolic acid copolymer, zinc stearate and potassium bromide, the core includes calcium phosphate salt particle, and the coating is wrapped in the surface of core.The preparation method includes the following steps: the preparation of promote bone repair component;The preparation of absorbable bone hemostasis repair bracket.The present application absorbable bone hemostasis repair bracket hemostasis anti-ability of scattering is strong, and has good inflammation regulation and promote bone repair effect.The present application absorbable bone hemostasis repair bracket can be used for any bone injury wound surface bone hemostasis and promote bone repair.

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 method comprises the following steps: firstly, preparing ferric vanadate through a hydrothermal reaction and calcination, then reacting the ferric vanadate with bismuth nitrate and potassium bromide to synthesize ferric vanadate bismuth oxybromide composite particles, finally adding the composite particles into a solvent, mixing the composite particles with polyvinylidene fluoride and the like to prepare a membrane casting solution, and finally, preparing the membrane casting solution into the photocatalytic membrane. And standing, degassing, forming a film and curing to obtain the photocatalytic film. According to the method, the photocatalytic efficiency and the visible light utilization capability are improved by utilizing the bismuth oxybromide iron vanadate heterojunction, the bismuth oxybromide iron vanadate heterojunction is compounded into the polyvinylidene fluoride matrix, the problems of catalyst recovery and falling are solved, and the membrane is endowed with anti-pollution and self-cleaning capabilities. And the preparation process ensures sufficient construction of heterojunctions, good interfacial compatibility and complete membrane structure, so that interfacial charges are smoothly transferred, the structural defects are reduced, efficient synergy of photocatalysis and membrane separation technologies is realized, the antibiotic wastewater treatment effect is improved, and the method has a good application prospect.

The present invention discloses a preparation method of substituted naphthalene derivatives. The method comprises the following steps: in the presence of methyl trifluoromethanesulfonate and potassium bromide, in a solvent, reacting a compound shown by formula II with a compound shown by formula III to obtain a substituted naphthalene derivative shown by formula I. The present invention relates to a preparation method for efficiently preparing substituted naphthalene derivatives by the synergistic catalysis of an organic reagent methyl trifluoromethanesulfonate (MeOTf) and potassium bromide (KBr). The whole process does not involve metals, the substrates are convenient to obtain, the reaction conditions are mild, and the operation is simple.

The application discloses a green preparation method of 4,4'-difluorobenzophenone. The method uses 4,4'-difluorobenzene as raw material, potassium bromide as catalyst, acetic acid as solvent, and oxygen as oxidant, and 4,4'-difluorobenzophenone is generated in high selectivity through one-step oxidation under mild conditions. The application surprisingly finds that in the presence of potassium bromide, a new non-metallic catalytic oxidation system of potassium bromide / acetic acid / oxygen is used to realize high-efficiency and high-selectivity conversion of the C-H bond at the benzyl position. Compared with the traditional method, the application does not need to use a transition metal catalyst, does not need to use carbon tetrachloride and other materials damaging the ozone layer, and does not need to involve a dangerous intermediate such as a diazonium salt, the process route is short, the atomic economy is high, the product yield is high, the product purity is high, the catalyst is cheap and easy to obtain, and the application has excellent industrial application prospect and green chemistry characteristics.

The invention discloses a method for determining the content of phenol in an iron-dextran injection / solution through combination of iron-sodium dihydrogen phosphate precipitation impurity removal and back titration, and relates to the field of analytical chemistry. According to the method, pretreatment is realized through precipitation reaction of iron and sodium dihydrogen phosphate, and interference of iron ions in iron dextran on detection is eliminated. Phenol and bromine are subjected to a bromo-phenol reaction through a potassium bromate-potassium bromide system, excessive bromine and potassium iodide are subjected to a reaction to generate iodine, a sodium thiosulfate titration solution is used for titration by means of an iodometric method, and the content of phenol is calculated. The method does not need a precise instrument, is simple and convenient to operate, can simply, quickly and accurately measure the phenol content in the iron-dextran injection / solution, effectively solves the problem of the existing detection technology in the detection of the sample, fills the technical gap in the detection of the phenol content of the iron-dextran preparation in China, and has a good application prospect. And a brand new solution is provided for veterinary drug production quality control and related detection work.

The invention provides a trace element formula suitable for industrial recirculating aquaculture of penaeus vannamei under an artificial seawater condition and a use method of the trace element formula, and relates to the field of industrial recirculating aquaculture. The trace element formula comprises potassium bromide, boric acid, strontium chloride, sodium silicate, zinc sulfate, ferrous sulfate, copper sulfate, manganese chloride, sodium selenite, ammonium molybdate, calcium gluconate and lysine, and the trace elements are added into a common feed to feed penaeus vannamei boone. The defects in the prior art are overcome, the growth efficiency of the penaeus vannamei boone is effectively improved by supplementing related trace elements in the feed, and the economic benefits of culture are increased.

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.