28 results about "Acid oxidation" patented technology

The invention discloses a microbial soil conditioner and a preparation method thereof, and relates to the technical field of soil improvement. The method comprises the following steps: culturing heavy metal-resistant chlorella and aspergillus niger to obtain a mixed bacterial suspension, combining the mixed bacterial suspension with a composite chelating modifier prepared by reacting chitosan quaternary ammonium salt, ethylenediamine tetraacetic acid and epichlorohydrin, carrying out crosslinking by using genipin to obtain a functional microbial agent, and carrying out pyrolysis and acid oxidation on corn straws as a raw material to obtain the heavy metal-resistant chlorella modified functional microbial agent. The preparation method comprises the following steps: preparing a nano zero-valent iron-biochar composite material, reducing and loading ferrous ions through sodium borohydride, preparing the nano zero-valent iron-biochar composite material, mixing the nano zero-valent iron-biochar composite material with zeolite, bentonite and a silane coupling agent, carrying out spray drying to prepare a porous carrier substance, and finally stirring and mixing an organic fertilizer complex microbial inoculant, the functional microbial inoculant and the carrier substance, and aging to prepare the soil conditioner. The prepared conditioner has a good remediation effect on soil heavy metal pollution.

The application discloses an automatic control method for oxidation flocculation parameters in mancozeb wastewater treatment, and belongs to the technical field of industrial wastewater treatment and automatic control. In view of the problem that the existing process relies on manual experience and the oxidation and flocculation stages are improperly connected, the multifunctional modified material containing dithiocarbamate salt groups, quinone groups and pre-complexed manganese and zinc ions is prepared first; the material and hydrogen peroxide are synchronously added in the acid oxidation stage, and the control system monitors the redox potential change rate in real time; when the redox potential reaches the preset threshold value and the characteristic change point with the first derivative of zero or the change from positive to negative appears and is maintained for the preset maintenance time, the system is automatically adjusted to be alkaline, the modified material triggers the net capture and chelation crosslinking reaction, and finally solid-liquid separation is carried out; the polymer skeleton is protected from indiscriminate attack of free radicals, the problem of drug antagonism is overcome, and the stable and up-to-standard effluent quality is realized.

The invention discloses application of bismuth vanadium tetraoxide as a photocatalyst in preparation of allantoin. According to the method, a decahedral single crystal micron material bismuth vanadium tetroxide is used as a photocatalyst, uric acid is used as a substrate, a photocatalytic reaction is performed under the irradiation of visible light, and uric acid is oxidized, hydrolyzed, decarboxylated and converted into allantoin; compared with a traditional chemical synthesis method, the method has the advantages that the bismuth vanadium tetraoxide serves as a photocatalyst, uric acid is converted into allantoin through photocatalytic reaction, selective activation of chemical bonds is achieved through directional regulation and control of photo-induced electron-hole pairs, and the method is mild in reaction condition, low in energy consumption and the like.

The present application relates to the technical field of electrochemical analysis detection, and particularly relates to a treatment method of a graphite electrode. The present application utilizes plasma to treat the graphite electrode, so as to realize that the oxidation peak potential of uric acid is obviously reduced, the uric acid can be oxidized on the surface of the graphite electrode at a lower potential, the oxidation of other reducing substances in blood is avoided, and the anti-interference ability during the uric acid test is improved.

The invention provides a method for comprehensively recovering selenium, tellurium, mercury, silver and lead from lead smelting acid mud, and belongs to the technical field of hazardous solid waste harmlessness and comprehensive resource recovery, and the method comprises the following steps: mixing the lead smelting acid mud, an activating agent and water, ball-milling and activating to obtain activated acid mud; carrying out low-acid oxidation leaching on the activated acid mud to obtain low-acid leaching liquid and low-acid leaching residues; carrying out high-acid oxidation leaching on the low-acid leaching residues to obtain high-acid leaching liquid; bismuth powder is added into the low-acid leaching liquid for tellurium enrichment reaction, and tellurium concentrate and tellurium enriched liquid are obtained; adding chlorine salt into the tellurium-enriched liquid, and reacting under a certain pH value to obtain bismuth oxychloride and bismuth-removed liquid; carrying out mercury enrichment on the bismuth removal liquid to obtain mercury-rich slag and mercury removal liquid; and adding a reducing agent into the mercury removal liquid to react to obtain crude selenium and reduced liquid. The method for comprehensively recovering selenium, tellurium, mercury, silver and lead from lead smelting acid mud provided by the invention is economical, efficient and environment-friendly, and can solve the problems that the acid mud containing elements such as selenium, tellurium, mercury, silver and lead is stockpiled, all valuable elements cannot be recovered, and the like.

The application belongs to the field of industrial catalysis, and particularly relates to a method for synthesizing 2-keto acid by alternation magnetic field assisted Fe3N catalytic oxidation of 2-hydroxy acid, wherein 2-hydroxy acid of formula 1 ( ), an oxidizing agent and Fe3N are mixed and catalytic oxidation is carried out under the assistance of an alternation magnetic field to obtain 2-keto acid of formula 2 ( ). The application innovatively finds that the alternation magnetic field assisted Fe3N catalytic oxidation of 2-hydroxy acid can cyclically synthesize 2-keto acid with high selectivity and high stability under mild conditions; thus, the industrial amplification production of 2-keto acid can be facilitated.

The invention relates to a method for synthesizing 5-methylpyrazine-2-formic acid-4-oxide through microchannel continuous flow, and belongs to the technical field of pharmaceutical chemistry and chemical process strengthening. According to the method, 5-methylpyrazine-2-carboxylic acid and hydrogen peroxide are used as raw materials, phosphoric acid, an inorganic salt catalyst and a small amount of hydrogen peroxide stabilizer are used as a catalytic system, water is used as a solvent, a phosphoric acid-inorganic salt catalyst synergistic catalytic system is constructed, and a pH differential feeding method is adopted, so that the reaction rate, selectivity and safety are synchronously improved; the invention relates to a process technology for preparing 5-methylpyrazine-2-formic acid-4-oxide in a continuous flow microchannel reactor. The method has the advantages of mild reaction conditions, short reaction time and high raw material utilization rate, can realize effective control in the reaction process, and provides a new method for safe production of 5-methylpyrazine-2-formic acid-4-oxide.

The application discloses a kind of waste acid oxidation-reduction potential detection guarantee method and device, waste acid from sulfidation reactor is respectively transported to cyclone and desorption tower by waste acid delivery pump through pipeline;Waste acid transported to cyclone enters cyclone along tangent direction, then by the outlet at the top of cyclone spirally rises into ORP flow cell;Low solid content waste acid contacts detection probe, and rotating scouring detection probe slows down solid aggregation on probe coating, then from the third waste acid outlet of side wall flows into desorption tower;Waste acid from cyclone and ORP flow cell converges after waste acid in desorption tower, and is transported to thickener processing by waste acid supply pump.The application process is simple, can effectively improve process operating environment, has good environmental protection benefit, ensures enterprise safety production, solves the detection precision problem of waste acid oxidation-reduction potential detection probe.

The invention belongs to the technical field of nano powder materials, and particularly relates to zirconium carbide powder and a preparation process thereof. The preparation method comprises the following steps: preparing carbon quantum dots by taking waste activated carbon as a carbon source through the steps of acid oxidation, alkali treatment, high-temperature hydrothermal passivation and the like, preparing zirconium quantum dots by taking sodium borohydride and zirconium oxychloride as raw materials through a water-phase chemical reduction method, mixing the carbon quantum dots and the zirconium quantum dots with nano sizes, and then performing Joule heating high-temperature treatment. Zirconium carbide powder is obtained within an extremely short time, it is guaranteed that the zirconium carbide powder has high purity, the particle size of the powder is reduced, and the specific surface area is increased.

The application belongs to the field of antimicrobial materials, and discloses an antibacterial bioactive coating and a preparation method thereof. The application converts β-cyclodextrin into a dialdehyde derivative through periodic acid oxidation, and copolymerizes the dialdehyde derivative with acrylated chitosan under the initiation of ultraviolet light free radicals to prepare an intelligent copolymer which can be specifically cut by β-cyclodextrinase. Natural plant polyphenols are loaded in the copolymer to realize enzyme-triggered precise release and maintain long-acting antibacterial activity. After coating, the solvent is removed, the micropores are closed, and the molecular-level secondary crosslinking is completed in one step under the treatment of supercritical CO2 environment at 35 MPa and 40 DEG C for 2 hours. Traditional high-temperature drying is not needed, internal stress and crack generation are significantly reduced, and the stability of the pores is improved. The final coating has self-repairing, high adhesion and scrub resistance, and the preparation process is environmentally friendly and efficient, and is suitable for the surface long-acting antibacterial protection of medical devices, food packaging and public facilities.

The application discloses a kind of molybdenum bis (dibutyl dithiocarbamate) oxide and preparation method thereof, comprising the following steps: molybdenum trioxide, phase transfer catalyst and water are uniformly mixed, are sent into first-stage mixing reactor, sodium hydrosulfide, sodium thiosulfate and water are uniformly mixed, also are sent into first-stage mixing reactor, and first reaction solution is obtained by reaction;Di-n-butylamine and water are uniformly mixed, are sent into second-stage mixing reactor, carbon disulfide is simultaneously sent, and second reaction solution is obtained by reaction;First reaction solution, second reaction solution are respectively sent into third-stage mixing reactor and are reacted, obtain molybdenum bis (dibutyl dithiocarbamate) oxide solution, solid-liquid separation, drying, obtained immediately.The yield of product obtained by the application is high, the purity is high, the quality is stable, the whole reaction process is continuously carried out in airtight container, there is no gas volatilization, which is conducive to environmental protection, reaction solvent is water, resource consumption is less, can be recycled, clean and environmentally friendly.

This invention discloses a continuous production method for preparing high-purity fulvic acid from coal gangue, comprising the following steps: coal gangue pretreatment, weak acid oxidation reaction, continuous screw conveying reaction, pre-membrane chelation, ultrafiltration purification, and concentration and collection. The method utilizes crushing, magnetic separation, and flotation to pre-remove impurities from the raw materials. A weak acid oxidation system with a molar ratio of HClO and CA of 1:0.2-0.5 is employed for mild pyrolysis and heavy metal pre-chelation. Continuous conveying and mixing are achieved using a co-rotating twin-screw extruder with an aspect ratio of 40-50. The final product is obtained through vacuum concentration after pre-membrane chelation with 0.05-0.5 wt% EDTA and purification via 800 Da ultrafiltration. High-purity fulvic acid is then obtained. This invention achieves continuous production throughout the entire process; heavy metal removal rate ≥99.7%; zero chlorinated byproduct generation; 89% reduction in hazardous waste generation; and closed-loop utilization of water resources. It solves the problems of low efficiency, poor product quality, and high environmental pressure associated with existing intermittent production technologies, enabling high-value utilization of coal gangue solid waste and is suitable for large-scale production.

The invention discloses a method for precipitating iron from wet-process zinc smelting leachate and application of the method, and relates to the technical field of wet-process metallurgy. The invention specifically discloses a method comprising the following steps: carrying out a semi-acid oxidation neutralization iron precipitation reaction on a leaching solution containing zinc sulfate and ferrous sulfate produced by wet-process zinc smelting, an oxidizing agent and a first neutralizer in a reactor; the mass ratio of zinc in the first neutralizer to iron in the hematite slag obtained by iron precipitation is (0.4-0.6): 1; the iron precipitation reaction contains at least five stages of sub-reactions; the dosage of the neutralizer in the first-stage sub-reaction, the dosage of the neutralizer in the second-stage sub-reaction, the third-stage sub-reaction, the fourth-stage sub-reaction and the fifth-stage sub-reaction is 20wt%-35wt%, 55wt%-70wt% and 5wt%-10wt% of the dosage of all the neutralizers respectively. By means of the method, reduction control over sulfur in the iron slag produced in the iron precipitation process can be effectively achieved.

The utility model provides a double-seal structure for a large flange of nitric acid oxidation furnace equipment, which comprises an upper cylinder and a lower cylinder, an upper flange is arranged at one end of the upper cylinder facing the lower cylinder, and a lower flange matched with the upper flange is arranged on the lower cylinder; the end, facing the lower flange, of the upper flange is provided with an upper bushing ring, the lower flange is provided with a lower bushing ring matched with the upper bushing ring, the upper bushing ring is provided with a first protruding part and a second protruding part at intervals, the first protruding part and the second protruding part are each of an annular structure, and the first protruding part and the second protruding part are coaxial with the upper bushing ring; an isolation gap exists between the two; sealing grooves are formed in the positions, corresponding to the first protruding part and the second protruding part, of the lower lining ring, and sealing gaskets matched with the first protruding part and the second protruding part are arranged in the sealing grooves. The double-sealing structure for the large flange of the nitric acid oxidation furnace equipment has the advantages of being good in sealing effect, easy to assemble and use and high in safety and reliability.

The present application relates to the technical field of water treatment, in particular to a DSD acid oxidation wastewater treatment method, comprising wastewater extraction, macroporous resin adsorption, iron-carbon microelectrolysis, MVR evaporation concentration; DNS in water is extracted by extractant to prepare DSD acid in DNS reduction section, improve product yield; the remaining DNS is enriched by macroporous resin adsorption, and after elution, DNS can be directly used for reduction to prepare DSD acid, the comprehensive removal rate of CODCr in the first two steps is 90-95%; iron-carbon microelectrolysis is used for advanced treatment, the color of effluent is colorless and transparent, and CODCr is below 100 mg / L; high-quality salt is obtained by MVR concentration, and the evaporated water is used for S2 resin desorption or DSD preparation process; the problem of DSD acid oxidation wastewater treatment is effectively solved.

The household split type slightly acidic electrolyzed water oxidation device comprises a main machine, a liquid spraying container, an electrolytic bath, a liquid outlet pipe and a butt joint assembly, when electrolyzed oxidizing water needs to be injected into the liquid spraying container, only the bottom of the liquid spraying container needs to be inserted into the liquid outlet pipe, so that the liquid outlet pipe is communicated with the interior of the liquid spraying container; compared with a container receiving mode in the prior art, the problem of oxidation potential water pollution caused by direct contact between oxidation potential water and the outside is avoided; and the process that the watering can cover needs to be tightened after receiving is also avoided, the situation that the oxidation potential water in the container is spilled out is prevented, meanwhile, nozzle pollution caused by the process of tightening the nozzle is also avoided, and therefore it is guaranteed that the private part is safely and hygienically cleaned.

The present invention provides a method and apparatus (2a) for producing at least one of calcium oxide, magnesium oxide and an iron oxide from an ore comprising a carbonate mineral of at least one of calcium, magnesium and iron, such as limestone and siderite ores. The method comprises producing liquid sodium and chlorine gas by electrolysis. The liquid sodium is oxidised to sodium oxide and the chlorine is used to make hydrochloric acid. The sodium oxide may be produced in a redox reaction with an oxide of another metal to produce the other metal in elemental form as well. The ore is added to the hydrochloric acid to dissolve the carbonate mineral therein, which produces gaseous carbon dioxide and an aqueous solution respectively comprising at least one of calcium chloride, magnesium chloride and ferrous chloride. The carbonate mineral is dissolved in the hydrochloric acid closed off from their surrounding environment and the carbon dioxide is captured. The aqueous solution is reacted with at least some of the sodium oxide, or sodium hydroxide derived therefrom, to produce an aqueous solution of sodium chloride and a precipitate respectively comprising at least one of calcium hydroxide, magnesium hydroxide and ferrous hydroxide. The precipitate is then phase separated from the aqueous solution of sodium chloride and the hydroxide(s) in the separated precipitate are thermally decomposed to produce water vapour and a solid end-product comprising the desired oxide(s). Sufficient heat for this thermal decomposition is transferred to the separated precipitate from at least one of the electrolysis products, the exothermic processes by which the precipitate is produced, their respective products and the products of the thermal decomposition itself. Thus the invention consumes no carbonaceous fuel, including any fossil fuel, and has electricity as its only energy requirement. If the electricity is produced from a source of renewable energy, it produces no greenhouse gas emissions. The apparatus (2a) comprises an electrolytic subassembly (10), a sodium oxide or hydroxide-producing subassembly (13), a hydrochloric acid-producing subassembly (12), a reaction subassembly (14), a solid-aqueous phase separator (16), a kiln (20), and a heat transfer pathway (23) for transferring enough heat to the precipitate in the kiln (20) to cause the thermal decomposition from at least one of: a product of the electrolytic subassembly (10), the other subassemblies (12, 13, 14) and their respective products, and a product of the thermal decomposition. The invention is intended to replace the traditional calcination process, including for the production of cement clinker, and can also be used to convert siderite ores into one or more iron oxides suitable for ironmaking. The captured carbon dioxide may be reacted with a second portion of the sodium oxide, or with sodium hydroxide derived therefrom, to produce sodium carbonate, thereby also providing a replacement for the Solvay process. In some embodiments, the method can even have a negative carbon footprint overall.

The application discloses a synthesis method of a dipyridamole key intermediate. The synthesis method of the dipyridamole key intermediate comprises the following steps: condensing ethyl 2-nitroacetate with ethyl oxalate, then condensing with urea, reducing the nitro group, condensing with urea again, chlorinating, and finally condensing with piperidine, so as to obtain the dipyridamole key intermediate 2,6-di-chloro-4,8-dipiperidyl-pyrimido[5,4-d]pyrimidine. The method avoids traditional nitrification and nitric acid oxidation processes, and the whole process is free of dangerous process, the reaction condition is mild, and the product yield is high.

This invention discloses a method for removing impurities from a palladium extraction pre-liquid, relating to the field of precious metal hydrometallurgy. The method includes: Step 1, Oxidation Pretreatment: The palladium extraction pre-liquid is heated and concentrated, then water is added, followed by the addition of a mixed acid oxidant, chlorine gas is passed through, and the liquid is boiled to remove the chlorine, then filtered to obtain pretreated solution 1; Step 2, Purification and Impurity Removal 1: Basic lead acetate solution is mixed with pretreated solution 1, and after solid-liquid separation, a purified palladium extraction pre-liquid 2 is obtained; Step 3, Purification and Impurity Removal 2: Thiourea reagent, ammonium oxalate reagent, and liquid alkali are added to palladium extraction pre-liquid 2, mixed, filtered, and the filtrate is used as purified palladium extraction pre-liquid 3; Step 4, High-Efficiency Extraction: Diisopentyl sulfide is washed with a washing solution, and the washed diisopentyl sulfide is used to extract palladium solution 3 to obtain a palladium solution. This method removes selenium and base metal impurities from the palladium extraction pre-liquid, achieving purification and impurity removal, ensuring the extraction efficiency of the solvent extraction process, and reducing reagent consumption and precious metal dispersion loss.

The invention discloses a lignocellulose component separation method which comprises the following steps: step 1, nano-enzymolysis: using immobilized laccase coated FeO nano-particles with the particle size of 30-70nm to treat a raw material for 1-3h under the conditions that the pH is 4.0-5.0 and the temperature is 40-50 DEG C, and the enzyme load is 15-35U / g of the raw material; step 2, plasma activation: treating for 3-8 minutes in a dielectric barrier discharge plasma reactor under the conditions that the power is 200-400W and the volume ratio of inert gas to oxygen is (3: 1)-(5: 1); step 3, oxidation of peroxydiacid: adopting peroxydiacid with the concentration of 0.2-0.5 mol / L to react for 1-2 hours under the conditions that the temperature is 50-70 DEG C and the pH value is 2.5-3.5; and 4, mechanical separation is conducted, specifically, treatment is conducted for 5-15 min through a high-speed shearing machine at the speed of 8000-12000 rpm, and screening is conducted with assistance of 30-50 kHz ultrasonic waves. According to the method disclosed by the invention, the cellulose yield is gt under the scale of annual output of 10,000 tons through nano-enzymolysis targeted breakage of LCC bonds, enhancement of reaction activity through plasma activation, selective oxidation of lignin through peroxydiacid and mechanical low-damage separation of the three components; the purity is 96% and the purity is gt; the COD (Chemical Oxygen Demand) of the wastewater is less than or equal to 120mg / L, and the problems of high pollution, high energy consumption and large component damage in the traditional method are solved.

This invention discloses a method for synthesizing 2-Cl-3-nitrobenzoic acid by nitric acid oxidation, belonging to the field of chemical synthesis technology. 2-Cl-3-nitrotoluene, an oxidant, and a catalyst are added to a pressure-resistant reaction flask and reacted at 120–140°C to obtain a 2-Cl-3-nitrobenzoic acid solution. Water and ethyl acetate are added to the obtained 2-Cl-3-nitrobenzoic acid mixed solution for extraction and separation, separating the organic phase. An alkaline solution is added to the organic phase to convert 2-Cl-3-nitrobenzoic acid to sodium 2-Cl-3-nitrobenzoate, separating the aqueous phase. An acidic solution is added to the aqueous phase to convert sodium 2-Cl-3-nitrobenzoate to 2-Cl-3-nitrobenzoic acid, followed by extraction and separation with ethyl acetate to separate the organic phase. The organic phase is concentrated under reduced pressure to obtain solid 2-Cl-3-nitrobenzoic acid. This invention uses inexpensive and readily available raw materials, the reaction process is easy to control, the product has high purity and yield, generates little wastewater, and is easy to treat, thus possessing high economic and environmental benefits.

The utility model discloses a tower type iron-containing waste acid oxidation reaction device. Comprising a tower body and a circulating pump, a dosing opening is formed in the tower body; a feeding hole and a first circulating hole are formed in the top end of the tower body; a baffling assembly is arranged in the tower body; the baffle assembly comprises a plurality of baffle plates, and the baffle plates form a baffle reaction channel in the tower body; the bottom end of the tower body is provided with an aeration assembly, a discharge port and a second circulation port; an inlet of the circulating pump is communicated with the second circulating port, and an outlet of the circulating pump is communicated with the first circulating port. According to the waste acid oxidation device, the flow path of waste acid liquid is effectively prolonged through the baffle plates, the gas-liquid contact reaction time is prolonged, the reaction effect is improved, and compared with a waste acid oxidation device in the prior art, the production efficiency is greatly improved; the modular design is adopted, and production, transportation and installation of the device are facilitated.

The invention belongs to the field of industrial catalysis, and particularly relates to a method for synthesizing 2-ketonic acid by catalyzing 2-hydroxy acid oxidation through Fe3N under the assistance of an alternating magnetic field, 2-hydroxy acid shown in a formula 1, an oxidizing agent and Fe3N are mixed and subjected to catalytic oxidation under the assistance of the alternating magnetic field, and 2-ketonic acid shown in a formula 2 is prepared. The invention innovatively discovers that the 2-ketonic acid can be circularly synthesized in a high-selectivity and high-stability manner under a mild condition by using the alternating magnetic field to assist Fe3N in catalyzing 2-hydroxy acid oxidation; therefore, the industrial large-scale production of the 2-ketonic acid can be facilitated.

The invention relates to a method for obtaining carbon dioxide, having the following steps: a) carrying out an anodic oxidation of hydrogen gas, an acid oxidation product being obtained; b) reacting the acid oxidation product with an alkaline carbonate-containing aqueous solution which has a pH value of >7 to 9 in particular, an aqueous acid solution being obtained; c) removing carbon dioxide from the aqueous acid solution, carbon dioxide gas and a degassed aqueous acid solution being obtained; and d) cathodically reducing acid components of the degassed aqueous acid solution in order to obtain cathodically generated hydrogen gas, wherein an aqueous alkaline solution is additionally obtained which has a pH value of 9.4 to ≥8.

The application discloses a method for synthesizing 2-F-3-nitrobenzoic acid by nitric acid oxidation, and relates to the technical field of chemical synthesis. First, a catalyst is prepared by dissolving ammonium molybdate and adding iron nitrate, the pH is adjusted to be acidic, and after reaction for 3 hours, a purified solid catalyst is obtained. Then, 2-F-3-nitrotoluene, an oxidizing agent and the catalyst are reacted at 130-150 DEG C to generate a 2-F-3-nitrobenzoic acid solution. Finally, high-purity 2-F-3-nitrobenzoic acid solid is obtained through ethyl acetate extraction, acid-base conversion, extraction and reduced-pressure concentration. The method has the advantages of easy acquisition of raw materials, easy control of reaction, high purity and yield of products, less generation of waste water, simple treatment, and economic and environmental protection benefits.

An object of the present invention is to provide a treatment liquid which, in a case of being applied to an object to be treated containing a silicon-germanium-containing substance and a silicon-containing substance, selectively dissolves the silicon-germanium-containing substance and suppresses a variation in a dissolution rate between a central portion and an end portion in the silicon-germanium-containing substance. The treatment liquid of the present invention is a treatment liquid used for an object to be treated, which contains a silicon-germanium-containing substance and a silicon-containing substance, to remove at least a part of the silicon-germanium-containing substance, the treatment liquid containing a fluoride ion source, an organic acid, an oxidant, a solvent having a relative permittivity of 10 or less, and water, in which a content of the water is more than 0% by mass and less than 30% by mass with respect to the total mass of the treatment liquid.

The application relates to the technical field of material science, in particular to RuO x -NiCo2O4 nanofiber materials and a preparation method and application thereof. The RuO x -NiCo2O4 (2.05<=x<=2.25) nanofiber material has a diameter of 100 nm to 250 nm and a length of 10 microns to 40 microns. The nanofiber material can be prepared by using an electrostatic spinning process, the preparation method is simple and easy to popularize in industry; the nanofiber material has uniform morphology, low overpotential and high catalytic activity under an acid oxidation potential condition, can exist stably for a long time, greatly reduces the cost of PEM electrolysis technology, and enables the PEM electrolysis technology to realize large-scale application.

The invention relates to the technical field of fine chemical engineering, in particular to a method for preparing a DSD acid oxidation intermediate by using a composite catalyst. The preparation method comprises the following steps: dissolving NTS in deionized water, adding a composite catalyst, introducing air, dropwise adding a sodium hydroxide solution, heating and preserving heat, introducing oxygen, heating, determining an end point by TLC, filtering, cooling, dropwise adding concentrated sulfuric acid for neutralization, filtering, washing and drying to obtain a product. Wherein the composite catalyst is prepared by doping copper nitrate and manganous nitrate, performing primary sintering with tetraethoxysilane, and modifying with a silane coupling agent. According to the method, the catalytic activity and stability are improved through the defect-type spinel structure and the hydrophobic microstructure of the catalyst, side reactions are inhibited, the product yield is high, the purity is high, and the process is simple, convenient and efficient.