279 results about "Sodium thiosulfate" patented technology

The invention relates to the technical field of sewage treatment, and discloses a novel sulfur autotrophic denitrification filter material and a preparation method and application thereof.The particle size of the filter material is 3.0-4.0 mm, and the filter material is prepared from 40%-45% of a composite sulfur source, 70 + / -2% of sulfur and 30 + / -2% of sodium thiosulfate, 30%-35% of modified ceramsite, 50-100 [mu] m / 200-300 [mu] m of bimodal pore size and 8%-10% of a conducting medium. The ratio of graphene to biochar is 3: 1), a buffer medium (5%-7%, Fe2O3 (52% + / -2%), CaCO3 (31% + / -2%) and MgO (17% + / -2%), a binder and an inert filler. The preparation method comprises the steps of raw material pretreatment, mixing granulation, stepped calcination, gradient impregnation, buffer medium directional loading, post-treatment and the like. The filter material solves the problems of by-product accumulation, insufficient microbial adhesion, large pH fluctuation and blockage of a traditional filter material through gradient sulfur release, a three-dimensional electron transfer network, a multistage pore anti-blockage design and a composite pH buffer system, is suitable for sewage denitrification treatment, and is high in denitrification efficiency and good in stability.

The invention belongs to the technical field of ceramic materials, and particularly relates to a high-strength building ceramic material and a preparation method thereof. The high-strength building ceramic material is prepared from the following raw materials in parts by weight: 20 to 30 parts of potassium feldspar, 15 to 23 parts of kaolin, 37 to 45 parts of solid waste-based silicon carbide, 1 to 4 parts of talc, 3 to 8 parts of modified mullite whisker and 2 to 5 parts of filler, a preparation process of the modified mullite crystal whiskers comprises the following steps: (1) adding mullite crystal whiskers into an ethanol water solution containing a silane coupling agent, and heating for reaction to obtain pretreated mullite crystal whiskers; and (2) adding the mullite whiskers pretreated in the step (1) into a nickel sulfate aqueous solution, then adding triethylamine and sodium thiosulfate, and carrying out a heating reaction to obtain the modified mullite whiskers. After the raw material components are combined, preparation of a high-strength ceramic material is facilitated, the heat conductivity coefficient can be increased, the heat conduction effect can be enhanced, and the ceramic material is suitable for common home decoration and high-heat-conductivity floor heating ceramic tiles.

The invention discloses a high-temperature-resistant and salt-resistant fracturing fluid and a preparation method thereof, and relates to the technical field of oil field fracturing fluids. When the high-temperature-resistant and salt-resistant fracturing fluid is prepared, sodium 3-chloro-2-hydroxypropane sulfonate, N, N-dimethylacrylamide and ethylene glycol react to prepare a quaternized solid product, and then the quaternized solid product reacts with 1-bromooctadecane to prepare an amphoteric hydrophobic monomer; guar gum powder reacts with 3-(1-naphthyloxy)-1, 2-epoxypropane to prepare naphthyloxy functionalized guar gum, and then the naphthyloxy functionalized guar gum, acrylamide and an amphoteric hydrophobic monomer are subjected to initiated polymerization through ceric ammonium nitrate to prepare modified guar gum; enabling zirconium oxychloride octahydrate, titanium chloride, lactic acid, ethanediamine and glycerol to react to prepare an organic zirconium cross-linking agent; and finally, mixing the modified guar gum, an organic zirconium cross-linking agent, sodium thiosulfate, sodium bromate, a surfactant and water to prepare the high-temperature-resistant and salt-resistant fracturing fluid. The high-temperature-resistant and salt-resistant fracturing fluid prepared by the invention has excellent high-temperature resistance and salt resistance.

The invention discloses a method for preparing a sodium-rich boundary-rich iron-based prussian blue analogue (FePBA) through one-step hydrothermal synthesis assisted by sodium thiosulfate. The method specifically comprises the following steps: preparing a solution A and a Na4Fe (I I) (CN) 6 solution; the molar ratio of ferrocyanide to Fe ions in the solution B is 3: 4. And preparing a solution B to react with ferrocyanide to form FePBA. Adding sodium citrate to form a sodium and citrate-rich environment, then adding ferric iron salt, and fully stirring to chelate the added Fe < 3 + > with the citrate; and adding sodium thiosulfate after the step. Preparing a PVP (Polyvinyl Pyrrolidone) solution to play roles in dispersing FePBA and reducing agglomeration, and taking the PVP solution as a solution C; slowly dropwise adding the solution A and the solution B into the solution C at a constant speed by using a rubber head dropper to finally obtain a precursor solution, carrying out hydrothermal reaction for 6 hours at 110 DEG C, carrying out suction filtration on the obtained precipitate, and drying to obtain a FePBA sample. According to the invention, the time required for synthesis is greatly shortened, and the traditional coprecipitation of more than 24 hours is improved into rapid hydrothermal reaction of 6 hours.

The invention relates to the technical field of water-soluble fertilizer production, in particular to a slow-release polyglutamic acid water-soluble fertilizer and a preparation method thereof. The slow-release type polyglutamic acid water-soluble fertilizer is prepared from the following raw materials in parts by mass: 2 to 10 parts of polyglutamic acid master batch, 18 to 28 parts of nitrogen fertilizer, 12 to 22 parts of phosphorus fertilizer, 15 to 20 parts of potassium fertilizer, 4 to 16 parts of medium trace elements, 9 to 15 parts of polyglutamic acid fermentation liquor and 35 to 60 parts of slow-release coating agent, the slow-release coating agent comprises the following raw materials in parts by mass: 6-13 parts of lecithin, 2-4 parts of sodium thiosulfate, 8-18 parts of vegetable oil and 19-40 parts of a zinc oxide-loaded cellulose / chitosan-based composite material; according to the slow-release type polyglutamic acid water-soluble fertilizer and the preparation method thereof, the polyglutamic acid water-soluble fertilizer is subjected to coating treatment, so that nutrients in the fertilizer can be slowly and continuously released, the effective supply time of the nutrients is prolonged, and the utilization rate of the fertilizer is increased.

The invention relates to the technical field of papermaking, in particular to food waterproof and oilproof paper and a preparation method thereof.The food waterproof and oilproof paper is composed of base paper and a coating layer covering the surface of the base paper; the base paper is prepared from the following raw materials: sisal fibers, polylactic acid fibers, water glass, nano silicon dioxide, starch and polyacrylamide; preparing a coating layer: coating the surface of base paper with the coating liquid, and then drying and calendering to obtain the coating layer; the coating liquid is prepared from the following raw materials: modified fucoidin, poly (butylene succinate), modified nano cellulose, sorbitol, polysilicate aluminum sulfate, polyvinyl alcohol, sodium thiosulfate and water. Through matching and combination of the raw materials, the food waterproof and oil-proof paper has certain antibacterial property and strength while improving waterproof and oil-proof properties, and the food fresh-keeping effect is improved.

This invention provides a PAM staining method that enables staining suitable for magnified observation of various samples using a range of microscopes, from optical microscopes to electron microscopes. [Solution] A PAM staining method comprising the steps of: silvering a biological sample; coloring the biological sample; and fixing the color of the biological sample, wherein the biological sample is a biologically derived sample that has been oxidized; the silvering step involves immersing the biological sample in a methenamine silver aqueous solution at room temperature, raising the methenamine silver aqueous solution from room temperature to 62°C or higher and 68°C or lower, and carrying out the silvering reaction for 30 to 40 minutes from the start of the reaction at room temperature; the coloring step involves immersing the silvered biological sample in a 0.2% gold chloride aqueous solution at room temperature for 8 to 12 hours; and the fixing step involves immersing the sample in a hard film fixing solution containing 11% to 13% sodium thiosulfate and aluminum potassium sulfate dodecahydrate for 3 minutes or more at room temperature.

The invention relates to a water treatment agent for advanced treatment of thallium-containing wastewater in nonferrous metallurgy. The water treatment agent is prepared by fully mixing and uniformly stirring the following raw materials in parts by weight: 50-80 parts of a sodium diethyldithiocarbamate aqueous solution with the mass concentration of 5%-15%, 10-40 parts of sulfide or polysulfide and 10-40 parts of sodium thiosulfate. The water treatment agent provided by the invention can realize efficient removal of heavy metal ions, does not need a subsequent treatment process, not only simplifies the treatment process, but also reduces the treatment cost.

The invention discloses a thermal cracking carbon black iodine absorption value test detection method, and relates to the technical field of material detection. The method comprises the following steps: drying thermal cracking carbon black at 125 DEG C for 1 hour to remove water, weighing 0.5 g of a sample, stirring and adsorbing with 0.04730 mol / L iodine solution at the rotating speed of 10-30 r / min for 10-30 minutes, carrying out centrifugal separation at the rotating speed of 3000-5000 r / min, ensuring that no residual carbon black exists in supernate through light transmittance detection, titrating with 0.03940 mol / L sodium thiosulfate solution, and calculating an iodine absorption value by combining a blank test. The innovation point is an exclusive drying process, dynamic adsorption-centrifugation synergy and a quantitative quality control system. The method has the beneficial effects that the detection period is shortened to be within 1 hour, the measurement error is reduced to + / -1.5%, the problems of insufficient adsorption separation and the like of a conventional method are solved, and the method is suitable for carbon black quality control in the fields of waste tire recovery and the like.

The invention discloses a preparation method of tiamulin and tiamulin fumarate based on Bunte salt, which comprises the following steps: mixing the Bunte salt and pleuromutilin p-toluenesulfonate, reacting at 45-65 DEG C for 3-5 hours to synthesize tiamulin, preparing the Bunte salt through a reaction formula 1, and preparing the pleuromutilin p-toluenesulfonate through a reaction formula 2, the molar ratio of the 2-diethylaminoethanol to the sodium thiosulfate to the chlorination reagent in the reaction formula 1 is 1: (1-1.3): (1-1.5), and the molar ratio of the pleuromutilin to the paratoluensulfonyl chloride to the pyridine in the reaction formula 2 is 1: (1-1.2): (1-1.2); the prepared tiamulin and fumaric acid are used as raw materials for a salt forming reaction, the reaction temperature ranges from 55 DEG C to 65 DEG C, the reaction time ranges from 40 min to 80 min, and after the reaction is finished, the tiamulin fumarate is prepared through cooling, crystallization, centrifugation and drying; the tiamulin fumarate disclosed by the invention is high in content, low in total amount of impurities, few in variety and stable in quality under high-temperature and high-humidity conditions, and the preparation method is simple and easy to operate and good in product quality.

The invention discloses an underwater non-dispersible early strength grouting material and a preparation method thereof, and relates to the technical field of building materials, the underwater non-dispersible early strength grouting material comprises ordinary Portland cement, silica fume, quartz sand, underwater non-dispersible reinforcing powder, polyvinyl alcohol coated sodium thiosulfate and a polycarboxylic acid water reducer; the underwater non-dispersible reinforced powder is a mixture of polyoxyethylene, an acrylamide-acrylic acid-acrylamide propyl trimethyl ammonium chloride copolymer and methyl cellulose. The method disclosed by the invention is simple to operate, the prepared grouting material is good in stability, has good dispersion resistance and self-leveling property in water, and can keep stable in an underwater environment and effectively fill gaps, the hydration process of the grouting material is promoted through combined addition of polyvinyl alcohol coated sodium thiosulfate and underwater non-dispersible reinforced powder, and the grouting effect is improved. The early strength of the grouting material is improved.

The invention discloses a method for measuring the content of ferric ions in an iron-chromium flow battery electrolyte, which comprises the following steps: before the content of the ferric ions is measured, pretreating the electrolyte to be measured to remove the influence of Cr ions and other impurity ions in the electrolyte on an experimental result, and then titrating with a sodium thiosulfate standard solution; the method has the advantages that the method is suitable for directly measuring the content of the ferric ions under the coexistence condition of a large amount of ferrous ions, the problems that in the prior art, when a large amount of ferrous ions and a trace amount of ferric ions coexist, the error is large, and the accuracy is low are solved, and a technical guarantee is provided for capacity recovery and efficiency improvement of the electrolyte of the flow battery.

The invention relates to the technical field of disinfectant preparation, in particular to a composite phenol disinfectant and a preparation method thereof.The preparation method comprises the following steps that S1, a solution A is prepared; s2, dissolving butylated hydroxytoluene and sodium thiosulfate in an organic solvent to obtain a solution B; s3, mixing crude phenol, organic acid, cyclohexane and a surfactant with water, and uniformly stirring to obtain a solution C; s4, mixing the solution A, the solution B and the solution C, and adding carboxymethyl tallow-based poly (propylamine) sodium and a preservative to obtain a compound phenol disinfectant; and S5, adjusting the pH value of the mixed composite phenol disinfectant to finally obtain a finished product of the composite phenol disinfectant. By optimizing the formula and innovating the preparation process, the stability and durability of the disinfection effect are remarkably improved, the problems of effect fluctuation and poor stability of a disinfectant in the prior art are solved, and the requirements of the livestock and poultry breeding industry for an efficient and stable disinfectant are met.

The invention relates to a nano bismuth agent for preventing and / or treating gastritis infection as well as a preparation method and application thereof, the preparation method comprises the following steps: respectively dissolving soluble bismuth salt and a sulfur-containing compound, mixing, and reacting to obtain the nano bismuth agent after the reaction is finished, the sulfur-containing compound is any one or a combination of at least two of thioamino acid, vitamin B1, thioacetamide, sodium sulfide, sodium thiosulfate, bovine serum albumin, whey protein, ovalbumin or metallothionein. The prepared nano bismuth agent has efficient antibacterial performance, shows an excellent curative effect which is two orders of magnitude higher than that of an existing bismuth complex on clinically separated drug-resistant helicobacter pylori, and does not further induce increase of drug resistance of the helicobacter pylori.

The present application provides a kind of prevention and control method of green moss in water lily planting pool, specifically belongs to water quality control technical field.The prevention and control method of green moss in water lily planting pool described in the present application includes the following steps: before planting water lily, water injection, water level is controlled at 15~20cm, copper sulfate is applied to kill green moss and its spores, keep water body not to flow during disinfection;After disinfection, apply sodium thiosulfate, and plant water lily;After planting water lily, keep replenishing water, control water level to 40~50cm, when green moss first outbreak, apply mineral fulvic acid potassium and composite bacillus;Subsequent green moss outbreak, apply mineral fulvic acid potassium, or apply mineral fulvic acid potassium and composite bacillus.The prevention and control method described in the present application is safe and efficient, which can quickly and effectively remove green moss without inhibiting the growth of water lily, and also does not affect the harvest of water lily.

The invention relates to a formula of shampoo and shower gel with efficient chlorine removal and repair functions, and belongs to the technical field of daily chemical products. The shampoo and shower gel comprises a chlorine removing formula, a substrate cleaning formula, a hair repairing and damage resisting formula, a chlorine damage repairing formula and a system stabilizing formula. The ascorbic acid and the sodium thiosulfate form a synergistic chlorine removal network, the chlorine removal efficiency is improved by 40% +, the dual-mechanism chlorine removal efficiency reaches 100%, meanwhile, damage repair is achieved through the synergistic effect of the panthenol, the squalane, the schizophyllan and other components, the skin glossiness is improved by 30%, the good washing and care experience is achieved during use, and the skin care effect is good. Compared with the prior art, the method has obvious advantages.

The application provides a purification and impurity removal method of a crude nickel-cobalt-manganese sulfate solution, and comprises the following steps: (1) adding thiosulfate to the crude nickel-cobalt-manganese sulfate solution to remove copper; (2) adding phosphate and adjusting the pH value to remove titanium, iron and aluminum; (3) adding iron sulfate and adjusting the pH value to remove phosphorus and silicon; (4) adding a bismuth agent and adjusting the pH value to remove chlorine; (5) adding a fluorine agent to remove calcium and magnesium; and (6) adding an ice rock mineral adsorbent to remove fluorine. The method can efficiently remove iron, aluminum, copper, fluorine, phosphorus, titanium, calcium, magnesium, chlorine, silicon and other elements from the crude nickel-cobalt-manganese sulfate solution, and the loss of main metals is low; the high-purity nickel-cobalt-manganese sulfate solution prepared can directly meet the requirements of a battery preparation grade precursor solution, the process is simple, the operation difficulty is low, and the industrialized production can be easily realized, and the method overcomes the shortcomings of the current high-purity nickel-cobalt-manganese sulfate solution preparation method.

The invention discloses a collagen membrane as well as a preparation method and application thereof, and belongs to the field of cosmetics. The preparation method of the collagen membrane comprises the following steps: pickling cow leather with lime, washing the pickled cow leather with water, then acidifying the cow leather with hydrochloric acid, washing the acidified cow leather with water, and washing away interfibrous substances until the hardness of the cow leather is 1t; the mmol / g is 0.1 to 0.3 mmol / 100g; cutting the obtained cow leather into particles, rolling the particles by a defibrator to obtain collagenous fibers, then adding a gelatinized acetate starch solution and a gelatinized chitosan solution into the collagenous fibers, and uniformly mixing and kneading to obtain collagenous fiber slurry with the water content of 95-97%; and casting the obtained collagen fiber slurry into a membrane, drying at 50-55 DEG C for 2-4 hours, soaking the membrane in a mixed solution of baking soda and glutamine transaminase for 2-3 seconds, drying at 50-55 DEG C, flushing by adopting a sodium thiosulfate solution, and washing to remove salt, thereby obtaining the collagen membrane. According to the preparation method, crosslinking among collagenous fibers is enhanced, and the structural stability of the membrane is improved.

This invention discloses a method for preparing a carbon source for microbial culture medium based on enzymatic hydrolysis of bamboo powder and its application, belonging to the field of high-value utilization technology of biomass resources. Using bamboo powder as raw material, the invention involves mild alkali pretreatment to disrupt the dense structure of lignocellulose, followed by enzymatic hydrolysis using a specialized enzyme system of endoglucanase Cel7B and xylanase XynA expressed heterologously by *E. coli* in an optimized ratio. After solid-liquid separation, an enzymatic hydrolysate rich in reducing sugars is obtained. The hydrolysate is then nutritionally fortified with trace elements such as sodium thiosulfate and sodium silicate to produce a low-cost, high-efficiency liquid carbon source. This invention achieves high-value utilization of bamboo waste. The entire process is mild, environmentally friendly, and simple, easily scaled up industrially, and solves the industry bottleneck of high carbon source cost in industrial microbial culture, demonstrating good application prospects and market value.

The invention discloses a gas-phase white carbon black tail gas dechlorination process, which belongs to the technical field of tail gas treatment, and comprises tail gas pretreatment and particulate matter separation, germanium molecular sieve carrier preparation and modification, Fe-Cu bimetallic nano-cluster loading, dynamic pulsed electric field activation, dry-process dechlorination, wet-process reduction synergistic dechlorination and photo-thermal coupling regeneration. According to the method, the alkyl halide dehalogenase is introduced as a stabilizer, and the Fe3O4-CuO nano-cluster activated by the dynamic pulsed electric field is adopted, so that the reaction process is remarkably optimized, the alkyl halide dehalogenase and active components in the sodium thiosulfate solution form synergistic action sites, the selectivity and efficiency of sodium thiosulfate participating in the reaction are improved, and the reaction time is shortened. The consumption in a non-target reaction is avoided; according to the Fe3O4-CuO nano-cluster activated by the dynamic pulsed electric field, the chlorine removal efficiency is improved, and the usage amount of sodium thiosulfate is reduced, so that the consumption amount of sodium thiosulfate and the generation amount of waste liquid are synchronously reduced, and the high-cost investment of enterprises on waste liquid treatment and the risk of environmental protection compliance are reduced.

The invention relates to a synthesis method of low-cost environment-friendly dioscorea element I. The synthesis method comprises the following steps: by taking 3, 5-dimethoxybenzyl alcohol as a raw material, brominating, reacting with triethyl phosphite and 4-benzyloxy-3-methoxybenzaldehyde to generate 3, 4 ', 5-trimethoxy-3'-benzyloxy stilbene, carrying out ultraviolet cyclization reaction, reacting with palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon and debenzylating with hydrogen to obtain the Chinese yam element I. The potassium iodide is used as the catalyst in the ultraviolet lamp irradiation catalytic ring closing reaction, the pure water is used as the detergent, compared with the method adopting iodine as the catalyst and adopting a sodium thiosulfate aqueous solution as the detergent, the product yield of the compound 33-4 is 75%, the yield of the compound 33-5 is 16.6%, the purity is 98.7%, and the method has the advantages of low cost, high yield, few impurities and the like.

The invention discloses a chromium-containing wastewater treatment and recovery treatment line and a recovery treatment method thereof. The ion exchange system is used for carrying out ion exchange adsorption on the hexavalent wastewater; the alkali washing system is used for outputting alkali liquor to the ion exchange system; the washing system is used for outputting washing water to the ion exchange system; the pickling system is used for outputting acid liquor to the ion exchange system; the chromium recovery treatment branch line is used for receiving the hexavalent wastewater of the ion exchange system, mixing the hexavalent wastewater with sulfur powder and alkali liquor to prepare chromium hydroxide, then carrying out filter pressing on the chromium hydroxide, outputting a chromium hydroxide filter cake to the recovery calcination treatment line, and outputting a press filtrate to the press filtrate recovery branch line; the press filtrate recovery branch line is used for recovering sodium thiosulfate from the press filtrate; and the recycling and calcining treatment line is used for calcining the chromium hydroxide filter cake into Cr2O3. According to the scheme, the purposes of micro discharge and even zero discharge of the chromium-containing wastewater are achieved, and the problem that a large amount of chromium-containing hazardous waste sludge is generated by depending on a chemical reduction-precipitation method in traditional chromium-containing wastewater treatment is solved.

The invention belongs to the technical field of cosmetic preparation, and particularly relates to a washing and caring two-in-one product containing a lactic acid bacteria fermentation extract and a preparation method of the washing and caring two-in-one product. Comprising the following raw materials in parts by weight: a thickening agent A, a skin conditioner, an anionic surfactant, a mild surfactant, cocamidomethyl, a thickening agent B, a chelating agent, a preservative, a moisturizing aid, a pH adjusting aid, an active matter and a proper amount of water. By adding the lactobacillus extract, the sodium thiosulfate and efficient and safe chemical components for compounding, the mild performance of the child shampoo shower gel is guaranteed, the powerful dechlorination function of the child shampoo shower gel is achieved, and the child shampoo shower gel has the skin conditioning function, is smaller in irritation, has the moisturizing and repairing effects and has a good application prospect. The lactobacillus fermentation extract has good moisturizing performance, can form a layer of moisturizing film on the skin surface, prevents moisture loss, keeps the skin moist and smooth, and also can promote metabolism of skin cells and enhance the moisturizing capacity of the skin.

The utility model provides a carbon black iodine absorption value measuring device which comprises a rotating wheel disc, a magnetic stirrer, a transmission filtering device and a reaction tank, a plurality of sample cups can be placed on the rotating wheel disc, after a mixed liquid sample is stirred by the magnetic stirrer, an iodine solution and a sodium thiosulfate solution are extracted by a plunger pump, and the iodine absorption value of the carbon black is measured. In the extraction process, carbon black in the iodine solution is filtered through the filter pipe, filtrate is added into the reaction tank and chemically reacts with the sodium thiosulfate, and the iodine ion electrode in the reaction tank can judge the end point of the reaction by detecting the electron exchange capacity of the iodine solution and the sodium thiosulfate in the reaction tank when the iodine solution and the sodium thiosulfate are subjected to oxidation-reduction reaction. And meanwhile, the measured current data is transmitted to a microcomputer for automatic processing, so that accurate carbon black iodine absorption value data is obtained. The problems that manual operation is low in efficiency and the precision is greatly influenced by human factors are solved, and the advantages of high efficiency and high precision are achieved.

The present application belongs to the field of metallurgy, and relates to a method for producing antimony white by directly oxidizing crude antimony, comprising the following steps: S1, mixing crude antimony with crude antimony alloy, and reacting under an oxygen-containing atmosphere, to obtain oxidized slag and a melt after the reaction is completed; S2, adjusting the temperature of the melt, and then introducing compressed air to react, to produce antimony trioxide-containing flue gas, and to obtain antimony oxide slag after the reaction is completed. The present application makes full use of impurities such as sodium sulfide, sodium hydroxide and sodium thiosulfate contained in crude antimony, and innovatively uses these components for arsenic removal reaction, which not only avoids the cumbersome steps of adding various auxiliary materials in the traditional process, but also enables the original sodium sulfide, sodium hydroxide and sodium thiosulfate in the crude antimony to fully play a synergistic role, showing excellent performance in arsenic removal effect, thus simplifying the process flow, significantly reducing the production cost, and realizing the dual improvement of economic benefit and process efficiency.

The invention discloses preparation of a Co9S8 / Ni7S6 heterostructure electrode and preparation and application of a paper-based coplanar miniature supercapacitor, a nickel source, a cobalt source and sodium thiosulfate are uniformly mixed to obtain an electrolyte for deposition, a patterned nickel metal electrode is immersed in the electrolyte for deposition, electro-deposition is performed on one side of the patterned nickel metal electrode by adopting a three-electrode system, and the paper-based coplanar miniature supercapacitor is obtained. And the Co9S8 / Ni7S6 heterostructure positive electrode is obtained. According to the invention, the cobalt-nickel sulfide Co9S8 / Ni7S6 is directly deposited on the current collector through a one-step electrodeposition method, so that the influence of an organic adhesive on an electrode is eliminated, and the binding power is stronger. The paper-based coplanar miniature supercapacitor prepared by using the electrode shows excellent cycling stability and energy density. Even under the folding condition, the capacity of the coplanar miniature supercapacitor is almost kept unchanged, and the coplanar miniature supercapacitor has excellent mechanical stability and practicability.

The invention discloses a preparation method of N-methyl o-fluoroaniline, which is characterized in that o-fluoroaniline is used as a starting raw material, and a target product is efficiently synthesized through three steps of reaction: step 1, in the presence of a solvent and alkali, o-fluoroaniline and acetyl chloride are acetylated at low temperature to generate 2-fluoro-acetanilide, and the product is directly used for the next step after being roughly purified; 2, under the action of a solvent and alkali, carrying out controllable methylation on the 2-fluorine-acetanilide and dimethyl carbonate to obtain 2-fluorine-N-methylacetanilide; and 3, removing acetyl protection through acidic hydrolysis, and adding sodium thiosulfate to prevent oxidation to finally obtain a high-purity product. According to the method, excessive methylation is avoided through an acetyl protection strategy, the process does not need high-risk operations such as ultralow temperature and high pressure, the operation is simple and convenient, the energy consumption is low, and the product purity is gt; the total yield reaches 79.86%, and the method is green, safe and suitable for industrial production.

The present invention discloses a high-strength, frost-resistant, macroporous recycled concrete, and its preparation method and application. The raw materials of the macroporous concrete include the following components: 30-50 parts by weight of cement, 2-4.5 parts by weight of fly ash, 130-165 parts by weight of recycled concrete coarse aggregate, 10-16 parts by weight of antifreeze, 21-25 parts by weight of glass particles, 13-18 parts by weight of carbon black or iron black, 2-3.5 parts by weight of plastic fiber filaments, and 11-17 parts by weight of mixing water. The antifreeze is a particle formed by a solid phase change energy storage material core and an asphalt layer covering the surface thereof, and the asphalt layer is doped with a metal thermal conductor, rubber powder, and cement powder, and the phase change energy storage material is paraffin and / or sodium thiosulfate. The above-mentioned high-strength, frost-resistant, macroporous recycled concrete of the present invention effectively improves the strength and frost resistance of macroporous concrete prepared with recycled concrete aggregate, thereby increasing the service life of this type of solid waste macroporous concrete.

The invention relates to a chemical absorption liquid for removing methyl iodide and a preparation method thereof, and belongs to the technical field of underwriting. The chemical absorption liquid comprises the following raw materials in percentage by mass: 0.2-5% of sodium thiosulfate, 1-10% of long-chain alkyl trimethyl ammonium halide, 0-1% of sodium hydroxide, 0-10% of polyethylene polyamine and the balance of water. The number of long-chain carbon atoms in the long-chain alkyl trimethyl ammonium halide is greater than 8; the chemical absorption liquid is prepared by completely dissolving and uniformly mixing the components. According to the chemical absorption liquid, the long-chain alkyl trimethyl ammonium halide salt is introduced as a surfactant for the first time, has a solubilizing effect, and can greatly reduce the gas-liquid mass transfer resistance of methyl iodide, so that efficient absorption of radioactive and non-radioactive methyl iodide is realized; the chemical absorption liquid is not only suitable for normal temperature, but also suitable for high-temperature and high-humidity environments, and harmful gas can be purified in a solution washing or solution spraying mode.

To provide a unit dosage form containing a pharmaceutically acceptable sodium thiosulfate (for example, sodium thiosulfate pentahydrate).SOLUTION: There is provided a unit dosage form which contains 10 ppm or less of non-removable organic carbon, 0.05 ppm or less of mercury, 2 ppm or less of aluminum, 0.003 wt.% or less of selenium, and on an anhydrous basis measured by ion chromatography, 98 wt.% or more and 102 wt.% or less of sodium thiosulfate, 10 ppm or less of heavy metals, 200 ppm or less of chlorides, 0.001 wt.% or less of sulfides, 0.002 wt.% or less of iron, 0.01 wt.% or less of calcium, 0.005 wt.% or less of potassium, 0.1% or less of sulfites, 0.5% or less of sulfates and 3 ppm or less of arsenic, 0.001 wt.% or less of lead or the like, wherein a 10% aqueous solution at 25°C is colorless and has a pH of 6.0 to 8.0.SELECTED DRAWING: None