100 results about "Sodium bromide" patented technology

The invention relates to the technical field of sewage treatment, and discloses a photocatalytic material and a preparation method and application thereof.The method comprises the following steps that bismuth nitrate pentahydrate and sodium bromide are added into a mannitol solution according to the molar ratio of 1: 1.5, and ultrasonic dispersion is conducted to form turbid liquid; adding arginine into the turbid liquid, wherein the molar ratio of the arginine to the bismuth nitrate pentahydrate is (0-2.5): 1; adjusting the pH value of the turbid liquid and stirring to obtain a precipitate; the precipitate is filtered, washed and dried, and the photocatalytic material nVBi-(110) BiOBr is obtained.By means of the photocatalytic material, the removal rate of hexavalent chromium in alkaline wastewater with the pH being 7-10 can still exceed 90% within a short time, the photocatalytic material shows excellent stability and reaction activity, the technical problem that hexavalent chromium is difficult to remove efficiently in the alkaline environment is successfully solved, and the photocatalytic material has good application prospects. The method has important environmental application value and popularization potential.

This invention provides a method for synthesizing a sulfonylpyrazole intermediate, belonging to the field of herbicide intermediate preparation technology. The method includes a condensation reaction of glyoxylic acid and hydroxylamine to generate 2-(hydroxyimino)acetic acid, followed by a chlorobromination reaction of the 2-(hydroxyimino)acetic acid to generate a chlorobromination intermediate. The chlorobromination intermediate then reacts with isobutylene to generate a sulfonylpyrazole intermediate. The key feature is that the chlorobromination reaction is carried out in the presence of sodium bromide and chlorine. This invention can maintain a stable reaction environment while improving the yield and purity of the intermediate product.

The application relates to the technical field of crystallization, in particular to a sodium bromide production device and a production method thereof. The device comprises a base, the upper end surface of the base is fixedly connected with a shell, a crystallization mechanism comprises a crystallization box fixedly connected with the upper half portion in the shell, a cross partition plate is fixedly connected in the crystallization box, the cross partition plate divides the crystallization box into multiple crystallization zones with the same volume, one vibration guiding assembly, two resonance assemblies and one liquid level detector are arranged in each crystallization zone, and a flip cover is hingedly connected with the upper end surface of the crystallization box. Through the cross partition plate, the vibration guiding assembly and the resonance assembly in the crystallization mechanism, the sodium bromide waiting for crystallization in the crystallization box can be subjected to partitioned and uniform crystallization, the vibration wave can be transmitted to the detector by the vibration guiding assembly to master the crystallization condition, the uniformity and the quality of the sodium bromide crystallization can be improved, and the uniformity and the efficiency of the crystallization process can be effectively improved.

This invention relates to a method for treating sodium bromide wastewater during the production of photoinitiators. The method includes vacuum distilling the sodium bromide wastewater in the presence of an adsorbent until sodium bromide precipitates, adding sulfuric acid and mixing, filtering, and adding hydrogen peroxide to the filtrate to react and obtain bromine. The bromine is then collected by distillation and separation. The method described in this invention can recover bromine from the wastewater during the preparation of photoinitiators and convert it into bromine, thereby achieving the recycling of bromine, reducing process costs and the pressure of treating waste gas, wastewater, and solid waste.

The invention belongs to the technical field of dibromohydantoin production, and particularly provides a dibromohydantoin synthesis method which comprises the following steps: S1, preparing a raw material aqueous solution, namely respectively mixing dimethyl hydantoin, sodium bromide and liquid caustic soda NaOH with deionized water to form a dimethyl hydantoin aqueous solution, a sodium bromide aqueous solution and a liquid caustic soda NaOH aqueous solution; s2, premixing the raw material aqueous solution, namely mixing the aqueous solution of dimethyl hydantoin, sodium bromide and caustic soda liquid NaOH prepared in S1 to obtain a premix; s3, electrochemical in-situ bromination reaction: introducing the premix into a micro-channel reactor provided with an electrolysis electrode, and applying current to the premix to obtain a dibromohydantoin initial solution; and S4, crystallizing, separating and drying the product, carrying out cooling crystallization through a three-stage stepped cooling method to obtain a dibromohydantoin crystal, carrying out centrifugal separation to obtain a dibromohydantoin wet product, and then drying to obtain a dibromohydantoin finished product. The method can improve the generation stability and the product quality of the dibromohydantoin.

The application provides a composite iron phosphate and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing nanocellulose, glacial acetic acid, acetic anhydride, perchloric acid and an organic solvent to obtain acetylated nanocellulose through reaction; (2) mixing nanocellulose, TEMPO and sodium bromide with water, adding sodium hypochlorite solution to obtain oxidized nanocellulose through reaction; (3) mixing the oxidized nanocellulose and the acetylated nanocellulose with an acidic aqueous solution, then mixing with an oily solvent to obtain a water-in-oil emulsion; (4) mixing an iron source, a phosphorus source and the water-in-oil emulsion, and then obtaining the composite iron phosphate through sintering treatment after reaction. The application utilizes the different hydrophilic / hydrophobic difference of acetylated and oxidized nanocellulose to induce the generation of a spherical shell-shaped iron phosphate filled with rod-shaped structures, the nanocellulose forms carbon in situ after high-temperature calcination, and the uniform distribution of the carbon layer is realized, and the conductivity is further improved.

The invention discloses a gradient digestion, extraction and detection method for microplastics in plant tissues, and belongs to the technical field of plant pollutant detection. The core of the method is that a hydrogen peroxide-based primary digestion solution, a cellulase and pectinase compounded tissue digestion solution and a residual digestion solution composed of a Fenton reagent and sodium bromide are sequentially adopted to perform three-stage digestion on a plant sample under a mild acidic condition so as to thoroughly remove organic matters and completely retain micro-plastics. After digestion, micro-plastics are extracted through filtration, ultrasonic enrichment and concentration, and finally accurate qualitation and quantification are carried out through thermal cracking-gas chromatography / mass spectrometry. The invention synchronously protects the special digestion solution composition and the kit for realizing the method. According to the scheme, the contradiction between incomplete removal of organic matters and damage of a micro-plastic structure in a traditional digestion technology is effectively solved, the unification of efficient impurity removal (gt, 90%) and high recovery rate (greater than or equal to 85%) is realized, and the accuracy and reliability of detection are remarkably improved.

The utility model discloses a kind of sodium bromide solution decoloring filter devices, belong to sodium bromide solution production technical field, its technical key points include preparation assembly, jacking assembly, filtering assembly, lifting assembly and deflection component.The utility model, when preparing sodium bromide solution, under normal circumstances, can directly inject solution into funnel, and input activated carbon powder, to complete the decoloring treatment of solution, solution can then be filtered by filtering assembly below funnel, to complete preparation, and in special circumstances, when there is precipitate in solution, decoloring treatment can be carried out only after filtering precipitate, filtering assembly can be moved to the upper side of preparation barrel by moving deflection component and lifting assembly at this time, so that the precipitate can be filtered by filtering assembly, and the above operation is repeated, i.e., the preparation of sodium bromide solution can be completed.

The invention discloses a method for preparing a nanoscale cellulose material from soybean shells, and relates to the technical field of nano modification. The method comprises the following steps: crushing degreased and impurity-removed soybean shells, and extracting with a 70-90wt% ethanol aqueous solution at 60 + / -5 DEG C for 2-4 hours to obtain a mixed solution; stirring with 2-6wt% of sodium hydroxide or potassium carbonate solution at the speed of 60-80rpm and the temperature of 80-95 DEG C for 1-4 hours to obtain coarse cellulose slurry; treating with a 1-3wt% sodium hypochlorite solution at the temperature of 60-80 DEG C for 0.5-2 hours to obtain a treatment solution; the preparation method comprises the following steps: preparing a slurry, drying at a low temperature of 30-40 DEG C for 12-24 hours, re-suspending until the slurry is 5-10 wt%, adding 0.1-0.3 time of TEMPO, 0.2-0.4 time of sodium bromide and 0.05-0.1 time of 2-4 wt% amino trimethylene phosphonic acid, reacting for 2-6 hours at a pH value of 9-11 and a temperature of 60-80 DEG C, performing ultrasonic-assisted treatment, centrifuging, and homogenizing to obtain modified cellulose; and performing membrane dialysis and freeze-drying to obtain powder. The method is low in raw material cost and green in process, the nano cellulose with the diameter of 20-50 nm, the high crystallinity of 60-80% and the thermal stability of 300-350 DEG C is obtained, and the method is suitable for the fields of composite material reinforcement and the like.

The invention relates to a preparation method of a nano silver halide emulsion, which comprises the following steps: S1, fully dissolving deionized water, sodium bromide, a nucleating aid, a stabilizer and gelatin in a container with disc type stirring, and uniformly mixing to prepare a primary glue solution; uniformly mixing silver nitrate with deionized water to prepare a silver nitrate solution; uniformly mixing sodium bromide, potassium iodide and deionized water to prepare a halogen solution; s2, at a certain temperature, injecting a prepared silver nitrate solution and a halogen solution into the primary glue solution at the same time to obtain a mother solution containing nano silver halide; and S3, desalting the mother liquor containing the nano silver halide, supplementing glue, and sensitizing to obtain the nano silver halide emulsion. The nucleating aid and the stabilizer are added into the gelatin aqueous solution, the prepared nano silver halide particles are uniform, stable in storage and free of aggregation, and the emulsion can be desalted at normal temperature, is low in energy consumption and high in production efficiency, and is beneficial to continuous production.

This invention relates to the field of terephthalic acid oxidation residue treatment technology, specifically a method for treating terephthalic acid oxidation residue. A method for treating terephthalic acid oxidation residue includes the following steps: S1. Pretreatment; S2. Separation; S3. Evaporation and concentration; S4. Incineration; S5. Ash dissolution; S6. Filtration; S7. Recovery of sodium carbonate and sodium bromide; S8. Recovery of cobalt-manganese catalyst; S9. Solid waste treatment; S10. Recycling of cobalt-manganese catalyst; S11. Recovery and reuse of sodium carbonate. This application achieves the recovery of sodium carbonate, sodium bromide, and cobalt-manganese compounds from the residue, as well as the recycling of sodium carbonate and cobalt-manganese compounds. The evaporation condensate is recycled during the treatment process, resulting in no waste discharge. The process is water-saving, energy-saving, and environmentally friendly.

The invention relates to the technical field of preparation of tert-butyl carbamate, in particular to a preparation method of (R)-(1-([1, 1 '-biphenyl]-4-yl)-3-oxopropane-2-yl) tert-butyl carbamate. Comprising the following steps: S1, taking a four-mouth bottle, adding 1780 g of dichloromethane, 165 g of (R)-tert-butyl (1-([1, 1 '-biphenyl]-4-yl)-3-hydroxypropane-2-yl) carbamate, 1.6 g of TEMPO and 2 g of tetrabutylammonium bromide into the four-mouth bottle, and stirring the four-mouth bottle, the dichloromethane, the (R)-tert-butyl (1-([1, 1'-biphenyl]-4-yl)-3-hydroxypropane-2-yl) carbamate, the TEMPO and the tetrabutylammonium bromide; s2, 33.5 g of a sodium bromide solution and 146 g of clear water of a phosphoric acid mixed salt solution are added into the four-opening bottle after stirring in the step S1, and liquid in the four-opening bottle is cooled to a specified temperature; s3, sodium hypochlorite with the available chlorine content being 9-10% is dropwise added into the four-opening bottle cooled in the S2; and S4, after dripping in the step S3 is completed, preserving the heat of the liquid in the four-mouth bottle, and adding 385 g of a sodium thiosulfate solution into the bottle for quenching reaction. And S5, sampling and detecting. The pH value buffering agent of a phosphate system, namely a sodium dihydrogen phosphate-disodium hydrogen phosphate composite salt system, is used, and the yield is 90-96%.

The invention provides a method for synchronously extracting and quantifying micro-plastics and tire abrasives in sludge and application of the method, and belongs to the technical field of residual sludge pollution monitoring. The method comprises the following steps: firstly, freeze-drying and grinding the excess sludge, pre-oxidizing by using a hydrogen peroxide solution to destroy aggregates formed among MPs and TWP, clay, sand and other substances, and then heating to remove the hydrogen peroxide solution; and the residual hydrogen peroxide solution in the pre-oxidation process is prevented from being continuously decomposed in the subsequent density separation process to generate bubbles for jacking impurities to float upwards. A saturated sodium bromide solution and a saturated sodium iodide solution are adopted as flotation reagents for primary density separation and secondary density separation correspondingly, it is guaranteed that MPs and TWP with different densities are separated, impurities are removed through Fenton oxidation digestion, and interference on recognition of specific thermal cracking products of MPs and TWP is reduced. The method provided by the invention can quickly and accurately evaluate the mass concentration pollution status of MPs and TWP in the excess sludge.

The application discloses a process method for preparing high-quality sodium bromide from bromine-containing brine without chlorine, and belongs to the technical field of chemical production. The process method uses ozone as an oxidant to oxidize bromine-containing brine, and simultaneously uses a gaseous membrane method to prepare sodium bromide. The process method is green, safe and efficient, and can greatly improve the safety of the production process without using chlorine as an oxidant. The bromine extraction mother liquor is environmentally friendly and does not contain residual chlorine. The obtained industrial sodium bromide product does not contain chlorine ions, the main content of sodium bromide is greater than 99%, and the quality is better than the indexes specified in the industry standard HG / T 3809-2006.

The invention relates to the technical field of crystallization, in particular to a sodium bromide production device and method. The sodium bromide production device comprises a base, and the upper end face of the base is fixedly connected with a shell; the crystallization mechanism comprises a crystallization box fixedly connected to the upper half part in the shell, a cross-shaped partition plate is fixedly connected to the interior of the crystallization box, and the interior of the crystallization box is divided into a plurality of crystallization areas with the same volume by the cross-shaped partition plate; a vibration guide assembly, two resonance assemblies and a liquid level detector are arranged in each crystallization area, and the upper end face of the crystallization box is connected with a turning cover through a hinge; through a cross-shaped partition plate, a vibration guide assembly and a resonance assembly in the crystallization mechanism, sodium bromide to be crystallized in the crystallization box can be subjected to partition crystallization and uniform crystallization, and the vibration guide assembly can transmit vibration waves to a detector to master the crystallization condition, so that the crystallization uniformity and quality of the sodium bromide can be improved, and the crystallization efficiency is improved. And the uniformity and efficiency of the crystallization process are effectively improved.

Adding acid to a solution containing bleach and soluble bromide salt accelerates the reaction producing sodium hypobromite which has a pronounced yellow color. The amount of acid needed to provide complete reaction can be controlled by measuring light absorbed by the solution. Add acid until Absorbance stops increasing, indicating complete conversion of NaBr to NaOBr. The amount of acid added can also be controlled by measuring pH before and after adding NaBr to diluted bleach. When enough acid has been added to fully neutralize sodium hydroxide in the bleach and provide nearly 100% conversion, the difference between the two pH values becomes positive and continuous to increase, whereby acid feed can be controlled to make pH change equal to or greater than a predetermined positive value.

The invention relates to a strong coordination type electrolyte with simple components, and belongs to the technical field of zinc-iodine battery electrolyte additives, and the electrolyte only contains zinc sulfate, an additive and water; the additive comprises any one of tetramethyl guanidine hydrochloride, betaine hydrochloride, sodium bromide, trimethyl ammonium bromide and trimethyl sulfoxide bromide. According to the electrolyte, hydrolysis failure of the electrolyte is inhibited by means of a strong coordination mode and efficient complexing I < + >, only a low-concentration single additive component is needed, and the electrolyte also keeps the advantage of high ionic conductivity of a water-based electrolyte and can accelerate substance transmission in a thick electrode, so that relatively high coulombic efficiency and cycling stability are realized under high iodine surface loading capacity; the invention also provides an ampere-hour level four-electron zinc-iodine soft package battery with high surface capacity, which can break through the performance bottleneck of the existing zinc-iodine battery in the aspect of practical application.

The invention belongs to the technical field of terahertz (THz) wave absorbing materials, and particularly provides a transparent flexible terahertz absorbing material based on ionic conduction loss and a preparation method thereof, which are used for meeting electromagnetic interference suppression requirements in high-transmittance scenes such as aviation optical windows, radomes and sensors. The transparent flexible terahertz absorbing material is composed of an upper anti-reflection layer, a lower anti-reflection layer and polymer-based hydrogel sealed between the upper anti-reflection layer and the lower anti-reflection layer, and the polymer-based hydrogel takes polyacrylamide (PAM) as a framework and water as a filling medium; the filling medium contains salt ions, and the salt ions are one or more of lithium chloride, sodium chloride, potassium chloride, cesium chloride, sodium fluoride, sodium bromide and sodium iodide; the transparent flexible terahertz absorber has the advantages of high wave absorbing performance, excellent flexibility and high transparency.

This invention provides a method for preparing tetrabutylphosphine acetate and simultaneously producing sodium bromide, belonging to the field of organophosphine salt preparation and electrodialysis separation technology. The method provided by this invention uses sodium acetate and tetrabutylphosphine bromide as raw materials, and prepares tetrabutylphosphine acetate and simultaneously produces sodium bromide via displacement electrodialysis. This achieves efficient ion exchange between tetrabutylphosphine bromide and sodium acetate, and simultaneous recovery of sodium bromide. The preparation method is simple, avoids the use of large amounts of chemical reagents, and reduces environmental pollution.

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 belongs to the technical field of sewage treatment, and particularly relates to a medical sewage treatment method for synergistically removing new pollutants and pathogenic microorganisms, which comprises the following steps: S1, pretreatment: putting an inorganic flocculant into medical sewage to promote the aggregation and precipitation of suspended particles and colloids in the medical sewage; s2, oxidation treatment: a composite agent is put into the pretreated medical sewage, a direct-current electric field is applied at the same time, the composite agent comprises potassium monopersulfate composite salt, sulfamic acid, sodium chloride, sodium bromide, a surfactant, a pH buffer agent, a composite corrosion inhibitor, an anti-blocking agent and anhydrous sodium sulfate, strong-oxidizing components are generated after the composite agent is dissolved, and the strong-oxidizing components are added into the pretreated medical sewage; organic matters are mineralized and decomposed, and pathogens are killed; s3, biochemical treatment: carrying out biochemical treatment on the medical sewage subjected to oxidation treatment to remove ammonia nitrogen and small molecular organic matters. According to the invention, various new pollutants can be effectively decomposed, pathogenic microorganisms are inactivated, and the treatment effect is improved.

The application discloses a graphene dispersion liquid and a preparation method and application thereof, and belongs to the technical field of PCBs.The graphene dispersion liquid provided by the application comprises modified graphene and a dispersing agent; the pH of the graphene dispersion liquid is 2-6; the modified graphene is TSiPD modified graphene; and the dispersing agent is a mixed aqueous solution of sodium bromide and sodium hypochlorite.The graphene dispersion liquid provided by the application can be used for hole metallization of PCBs, and can significantly improve the uniformity of the conductivity in the holes and the adhesion strength between the graphene and the hole walls.The application further provides a preparation method and application of the graphene dispersion liquid.

This invention discloses a high-efficiency sodium bromide recovery process for PTA wastewater, belonging to the technical field of wastewater treatment and bromine resource recovery and utilization in the production of purified terephthalic acid. The process includes the following steps: Pretreatment softening: A stream of bromine-containing wastewater generated during the production of purified terephthalic acid is provided. The bromine-containing wastewater is introduced into a chelating resin unit at a volume hourly space velocity (VHSV) to remove calcium and magnesium ions from the bromine-containing wastewater, resulting in softened water. Through a re-filtration enhanced salt separation step, the physical washing effect of the dialysis water is utilized to effectively wash the retained bromide ions into the product water side, overcoming the Donnan effect at high concentrations. Through an acidification and decarbonation step, the wastewater is transformed from a complex ternary system of carbonates, bromides, and sulfates into a simple binary system of sulfates and bromides, eliminating the interference of carbonate ions on the membrane system.

The application provides a bromine-based leaching reagent system and a method for recycling precious metals from waste circuit boards, and belongs to the technical field of hydrometallurgy. The application takes stable bromine-based strong oxidant, sodium bromide and sodium iodide as the leaching reagent system, controls the bromine volatilization loss to be below 5% through the slow-release bromine mechanism, reduces the bromine consumption by more than 15% compared with the traditional liquid bromine leaching process, simultaneously introduces sodium iodide as a catalytic additive, and significantly reduces the sodium bromide consumption. The weak acid leaching environment is adopted, the leaching efficiency is ensured, and the equipment corrosion problem is effectively reduced. The developed "distillation-precipitation" coupling process realizes efficient recovery of silver and synchronous regeneration of bromine reagent, so that the bromine recycling rate is more than 80%. Through the construction of a gold selective reduction-silver distillation precipitation-palladium solvent extraction hierarchical separation system, efficient recovery of precious metals is realized. The application greatly reduces the processing cost through the recycling of bromine reagent, has significant industrial application value and broad market prospect.

The application is suitable for the technical field of inorganic substance preparation method, and provides a preparation method of bromine, which comprises the following steps: step one: a certain amount of sodium bromide and hydrobromic acid are added into a mother liquor pool and stirred to obtain a mother liquor; step two: a predetermined amount of stearic acid and polyvinylpyrrolidone are added; step three: preheating is carried out, and then the preheating is fed into an absorption tower; step four: the liquid at the bottom of the absorption tower flows into the upper part of a bromine evaporation tower, and is heated by steam in the bromine evaporation tower; water vapor and chlorine gas are introduced from the bottom of the bromine evaporation tower, and bromine steam enters the absorption tower; step five: the distillation acid liquid generated by the bromine evaporation tower flows into a preheater to be preheated; bromine steam flows out from the upper part of the bromine evaporation tower to obtain a bromine and water mixture; step six: the bromine and water mixture flows into a bromine water separation bottle to be separated, and bromine products are obtained, thereby, the bromine source is hydrogen bromide and sodium bromide; the stearic acid can effectively reduce the surface tension, so that the reaction is more uniform, and the system is stable.

This invention discloses a sodium bromide feeding system and method for ton bags, relating to the field of bromine production technology. The system and method include a sodium bromide silo equipped with an electric hoist and a screw conveyor assembly fixedly connected to its lower end. It also includes a fixed feed cylinder located inside the sodium bromide silo near its lower end to limit the size of the ton bag's outlet and reduce dust generation. This invention uses multiple cutting blades forming a conical structure at the upper end of the fixed feed cylinder to cut open the bottom of the ton bag, creating an outlet. The cutting blades continue until all the blades are inside the ton bag. At this point, the fixed feed cylinder is positioned at the outlet, fixing the outlet size and allowing the sodium bromide to fall evenly, reducing dust generation. Simultaneously, the first and second cutting blades reciprocate to chop and break up any clumps of deliquescent sodium bromide and disrupt the arched support structure formed by the sodium bromide, reducing bridging and blockage.

The utility model relates to the technical field of gas field water treatment and bromine extraction devices, and particularly discloses a gas field water bromine extraction device which comprises an electrooxidation unit, a bromine storage tank, a blow-off tower, a chlorine washing tower, an absorption unit with an injection port, an evaporation centrifugal unit and a demisting tower connected with the absorption unit and the blow-off tower respectively, the electrooxidation unit is externally connected with a raw water tank; the demisting tower and the electrooxidation unit are respectively connected with the raw water tank. According to the device disclosed by the utility model, chlorine oxidation is replaced by electrooxidation, so that a hazardous chemical substance C l2 is prevented from being used in the oxidation process, and meanwhile, the product can be a derivative such as sodium bromide.

The invention discloses a continuous detection method for the content of copper, lead and zinc in gold mud, and belongs to the technical field of chemical analysis and detection. The method comprises the following steps: dissolving a gold mud sample in aqua regia at low temperature, forming an AgCl precipitate in a certain acidic environment to remove silver ions, reducing gold with sodium sulfite, adding sodium bromide and tartaric acid to mask interference, dispersing colloid, performing hot filtration separation, recovering gold and silver, and determining the content of copper, lead and zinc in a constant volume of filtrate. Tartaric acid and NaBr have a good synergistic effect, form double complexation, are suitable for high-content lead samples, mask metal ion interference, disperse colloid and reduce physical adsorption of precipitates, are high in applicability and low in consumption for gold mud samples with complex matrixes, and can ensure that the contents of copper, lead and zinc can be rapidly and accurately measured in metallurgical production.

This invention relates to the field of compound synthesis technology, specifically disclosing a method for synthesizing 2-bromophenanthrene. The method includes the following steps: adding phenanthrene to a solvent, then adding sodium hydroxide and sodium bromide to the solvent, followed by dropwise addition of an aqueous solution of sodium hypobromite, stirring the reaction mixture to obtain the product 2-bromophenanthrene. The synthesis method provided by this invention is low-cost and has a high yield.

The application discloses a preparation method of a bismuth sulfide nanorod / bismuth oxybromide composite photocatalytic material. The method adopts a hydrothermal method, first prepares a bismuth sulfide precursor, and then grows the bismuth sulfide nanorod / bismuth oxybromide composite material through hydrothermal growth after the bismuth sulfide precursor is uniformly stirred with bismuth nitrate pentahydrate and sodium bromide. The composite material has a unique nano structure and good photocatalytic performance by adjusting the mass of the bismuth sulfide precursor in the composite material. When 2 mmol of bismuth oxybromide and 0.05 g of the bismuth sulfide precursor are used to hydrothermally synthesize the bismuth sulfide nanorod / bismuth oxybromide composite material, the composite material has the optimal rhodamine B removal performance, and the removal rate can reach 99.2% after 30 min of dark adsorption and 15 min of photocatalytic reaction; meanwhile, the bismuth sulfide nanorod / bismuth oxybromide composite photocatalytic material also has good removal effects on tetracycline, methyl orange and other organic pollutants.