491 results about "Potassium permanganate" patented technology

The invention relates to an aluminum oxide CMP polishing solution for rough polishing of silicon carbide wafers and a polishing method of the aluminum oxide CMP polishing solution, and the aluminum oxide CMP polishing solution comprises the following components in percentage by weight: 2-10wt% of nano aluminum oxide abrasive; 0.2 to 2 wt.% of a dispersant; 0.001 to 0.01 wt% of a pH regulator; the concentration of the oxidizing agent is 1-5wt.%. By adopting the compound oxidant, potassium permanganate is utilized to oxidize a reduction product manganese dioxide on the surface of the silicon carbide wafer to activate potassium persulfate, so that a large amount of sulfate free radicals are generated in the polishing solution, the oxidability of the sulfate free radicals is extremely high, the polishing solution can be promoted to generate chain oxidation reaction, and the surface of the silicon carbide wafer is further oxidized; and an oxide layer with low hardness is formed on the surface of the silicon carbide and is finally removed under the mechanical action of the aluminum oxide abrasive, so that the ultra-smooth and damage-free surface of the silicon carbide wafer is formed. The surface roughness of the obtained optimal silicon carbide wafer is 0.125 nm, and the material removal rate is 3.5 [mu] m / h. Compared with an existing aluminum oxide polishing solution, the polishing solution has the advantage that the surface quality and the polishing efficiency of the silicon carbide wafer are remarkably improved.

The invention belongs to the technical field of denitration catalyst preparation, and discloses a meerscham-TiO2 composite carrier loaded manganese cerium medium and low temperature denitration catalyst and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing meerschaum and nitric acid, then heating and stirring for reaction, then carrying out suction filtration and washing, and drying to obtain a meerschaum-TiO2 composite carrier loaded manganese cerium medium and low temperature denitration catalyst; after the treated sepiolite is drained, drying and screening are conducted, and nitric acid acidified sepiolite is obtained; and (2) mixing the meerschaum acidified by nitric acid and TiO2, then adding the manganese source precursor solution into the acidified meerscham-TiO2, then dipping and stirring, dropwise adding a potassium permanganate solution into the solution, then adding a cerium nitrate solution, stirring and then carrying out suction filtration, drying, grinding and screening the obtained filter cake, and then calcining to obtain the catalyst. According to the invention, the acidified sepiolite and TiO2 are compounded, so that complementary advantages of the two carrier materials are realized, and the obtained catalyst not only has good denitration efficiency, but also can significantly reduce the production cost.

The invention belongs to the technical field of radioactive wastewater treatment, and particularly relates to composite aerogel for adsorbing Cs < + > and Sr < 2 + > in radioactive wastewater under an acidic condition and a preparation method of the composite aerogel. The preparation method of the composite aerogel comprises the following steps: (1) synthesizing ammonium phosphomolybdate / sodium alginate aerogel; (2) growing ZIF-8 on the surface of the ammonium phosphomolybdate / sodium alginate aerogel; and (3) modifying the surface of the material obtained in the step (2) by using potassium permanganate to generate MnO2, thereby obtaining the composite aerogel. The composite aerogel can efficiently adsorb Cs < + > and Sr < 2 + > in wastewater to realize efficient co-adsorption of double ions, and has the advantages of low energy consumption, high selective separation efficiency, capability of carrying out one-step curing separation, no secondary pollution and capability of effectively avoiding the defects of redundant separation operation and large waste liquid amount in a traditional method, and a high-capacity and easily-recycled adsorbent scheme is provided for radioactive wastewater treatment.

The invention discloses a method for purifying acetonitrile, and belongs to the technical field of organic solvent purification. The acetonitrile purification method comprises the following steps: dehydrating an acetonitrile solution through a membrane dehydration device, enabling the dehydrated acetonitrile to pass through an adsorption column filled with a magnetic iron oxide / graphene composite adsorbent, and collecting effluent; and carrying out normal pressure rectification on the effluent, controlling the reflux ratio to be 10: 1-8, the heating temperature of the rectification kettle to be 110-150 DEG C, the temperature of the acetonitrile liquid in the kettle to be 80-90 DEG C and the temperature of the distilled liquid to be 75-85 DEG C, and collecting to obtain purified acetonitrile. The method effectively solves the problems that a traditional potassium permanganate oxidant is adopted for purification at present, impurities generated by reaction are insoluble in water and difficult to remove, the environment is polluted to a certain extent, the impurities need to be filtered and removed, the operation is tedious and the like, is green and safe, and does not generate waste residues; and the final acetonitrile yield is greater than 90%, and the purity reaches 99.99%.

The invention discloses a process for preparing flame-retardant polyethylene plastic by recycling waste polyethylene plastic, and relates to the technical field of high polymer materials. When the flame-retardant polyethylene plastic is prepared, the waste polyethylene is extruded and granulated to prepare the polyethylene master batch; carrying out catalytic pyrolysis on the polyethylene master batch, and then reacting with potassium permanganate to prepare a hydroxylated carbon nanotube; the preparation method comprises the following steps: reacting a hydroxylated carbon nanotube with 1-(chloro-methylphosphoryl) ethylene, and then reacting with (mercaptomethyl) triethoxysilane to prepare a modified carbon nanotube; the preparation method comprises the following steps: carrying out irradiation grafting on a polyethylene master batch, 2-hydroxy-4-propenyl benzophenone and N, N-diethyl allylamine, and then reacting with chloromethyl triethoxy silane to prepare modified polyethylene; and carrying out melt extrusion on the modified carbon nanotubes and the modified polyethylene, carrying out injection molding, and carrying out water treatment to obtain the flame-retardant polyethylene plastic. The flame-retardant polyethylene plastic prepared by the invention has good flame retardant property, antibacterial property, tensile strength and anti-aging property.

The invention constructs a universal visual virus molecularly imprinted sensor modified with an anti-protein coating, the sensor uses magnetic Fe3O4 as an imprinting carrier, HBV as a template and dopamine as a functional monomer for imprinting to obtain a molecularly imprinted polymer with a polydopamine coating (PDA), and before the template is removed, the molecular imprinting polymer with the polydopamine coating (PDA) is separated from the template, so that the molecular imprinting polymer with the polydopamine coating (PDA) is obtained. The surface of the PDA layer is covered with a slightly cross-linked PMEO2MA layer through a water precipitation polymerization method, and the polymer can effectively reduce non-specific protein adsorption; and finally, exposing an imprinting cavity of the PDA layer by eluting the template molecules. On the other hand, potassium permanganate (KMnO4) is used as a signal output molecule, and when no target object exists, the strong reducibility of PDA can enable KMnO4 entering the imprinting cavity to be subjected to a color fading reaction. Based on the principle, high-specificity colorimetric visual detection on the HBV is realized. The sensor can be combined with a smart phone through naked eyes to carry out visual semi-quantitative analysis and carry out quantitative detection through ultraviolet rays, and the universality of the sensor can be confirmed through a template replacement experiment. And meanwhile, the sensor shows an excellent cost advantage. The diagnosis which is high in sensitivity, low in cost and capable of achieving rapid visualization shows huge potential in practical application, and particularly has important application value in infectious disease screening and monitoring work in areas with limited resources.

The invention discloses a metal element doped MnO2 and MnFe oxide composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of flue gas desulfurization and denitrification. The preparation method comprises the following steps: dissolving potassium permanganate, divalent manganese salt and doped metal salt in water for reaction to prepare metal element doped MnO2; and mixing and reacting with a template agent, ferric salt and sodium salt, drying and roasting to obtain the final catalyst. The MnO2 electronic structure is modulated by doping metal elements, and the three-dimensional porous structure of the MnFe oxide is constructed by using the template agent, so that the catalyst has efficient adsorption and strong catalytic oxidation capacity, NO and SO2 can be synergistically removed at the same time, and the catalyst has desulfurization and denitrification activity in a wide temperature range of 30-300 DEG C, and is suitable for industrial production. And liquid ammonia does not need to be used in the purification process, so that the purification agent is high in safety and is particularly suitable for purification treatment under complex flue gas conditions in the non-electric industry.

The invention relates to the technical field of water treatment, in particular to an MOF derived carbon composite material formed based on an impregnation method and application of the MOF derived carbon composite material. When a conventional activated carbon electrode material is used as a CDI electrode, the desalination efficiency is poor. In order to solve the technical problems, the MOF derived carbon composite material formed based on the impregnation method is provided, compared with a conventional metal oxide and MOF compounding process, the preparation process of the obtained MOF derived carbon composite material is different from the conventional metal oxide and MOF compounding process, the high-temperature carbonization opportunity and frequency of the composite material and the dosage ratio of MOF derived carbon to a potassium permanganate aqueous solution are different, and the preparation process is simple. The MOF-derived carbon and the potassium permanganate aqueous solution have obvious influence on the CDI desalination performance of the obtained MOF-derived carbon composite negative electrode plate, and experiments prove that when the dosage ratio of the MOF-derived carbon to the 0.005 mol / L potassium permanganate aqueous solution is 1: 10, and high-temperature carbonization is performed after dipping and compounding, the CDI desalination performance of the obtained MOF-derived carbon composite negative electrode plate is more excellent.

The utility model discloses an efficient HEPA potassium permanganate composite filter material preparation particle self-suction type feeding device, which comprises a feeding bin, a negative pressure mechanism and a feeding mechanism, the top of the feeding bin is provided with a main feeding port, the main feeding port is provided with a main feeding pipeline, the main feeding pipeline is provided with an upper layer electric valve and a lower layer electric valve, and the upper layer electric valve and the lower layer electric valve are connected with the negative pressure mechanism. A Y-shaped feeding pipe is mounted at the top of the main feeding pipeline, the Y-shaped feeding pipe is provided with two input pipelines and an output pipeline, the output pipeline is connected with the top of the main feeding pipeline, a negative pressure port is formed in the top of each input pipeline, a filter screen is mounted at the position, close to the negative pressure port, in each input pipeline, and branch feeding ports are formed in the positions, below the filter screens, of the input pipelines; the utility model further comprises. According to the automatic feeding device, automatic feeding and supplementing of particle materials can be achieved, manual time-consuming and labor-consuming feeding and frequent feeding are not needed, the input pipeline is switched to be communicated with the negative pressure source in the feeding process, the filter screen is prevented from being blocked, and the feeding efficiency of the particle materials is improved.

The invention relates to the technical field of modified biochar, in particular to wood vinegar modified biochar, a saline-alkali soil modifier containing the wood vinegar modified biochar and a preparation method of the wood vinegar modified biochar. The invention provides a preparation method of wood vinegar modified biochar, which comprises the following steps: cleaning and drying biochar, adding the biochar into wood vinegar, stirring at room temperature for 0.5-1 hour, adding a potassium permanganate solution, continuously stirring for 2.5-4 hours, carrying out solid-liquid separation, and collecting solids to obtain the wood vinegar modified biochar. The invention further provides the wood vinegar modified biochar, a saline-alkali soil modifier containing the wood vinegar modified biochar and a preparation method of the wood vinegar modified biochar. The saline-alkali soil improver has excellent sodium ion adsorption capacity and plant growth promoting capacity, inorganic acid, organic acid or various microbial strains do not need to be used in the preparation process, the preparation method is simple and feasible, and the saline-alkali soil improver can be widely applied to development and utilization of saline-alkali soil.

The application discloses a preparation method of a manganese residue-based catalyst and application thereof, and belongs to the technical field of solid waste treatment. The application comprises the following steps: manganese residue is added into water and uniformly mixed to obtain a manganese residue turbid liquid; a soluble manganese salt solution and a potassium permanganate solution are mixed, and then added into the manganese residue turbid liquid to perform a hydrothermal reaction; and after washing and drying, a manganese residue-based catalyst is obtained. The catalyst prepared by using the manganese residue as a main raw material can efficiently degrade common organic wastewater, and the purpose of "waste treatment by waste" is achieved. In addition, the raw material manganese residue and the modifier are cheap and easy to obtain, the preparation method is simple, the production cost is low, and the application is beneficial to industrial popularization and use.

The invention discloses a plasma catalyst, a preparation method thereof and application of the plasma catalyst in degradation of dimethyl sulfide by plasmas. The plasma catalyst comprises a manganese oxide carrier and Ag monoatoms loaded on the manganese oxide carrier; the manganese oxide carrier comprises rod-like crystalline manganese dioxide and amorphous manganese oxide wrapping the outer layer of the crystalline manganese dioxide. The preparation method comprises the following steps: 1) uniformly dispersing rod-like crystalline manganese dioxide in a mixed solution B of potassium permanganate and manganese sulfate, stirring for reaction, then carrying out solid-liquid separation, taking a solid, washing and drying to obtain a manganese oxide carrier; and 2) dispersing the manganese oxide carrier in deionized water, then adding a silver nitrate solution into the deionized water, uniformly mixing, then dropwise adding a hydrogen peroxide solution, stirring for reaction, then carrying out solid-liquid separation, taking a solid, washing, drying and calcining in a non-oxidizing atmosphere to obtain the plasma catalyst.

The invention provides a preparation method of an acoustic / photosensitizer-manganese dioxide nanoparticle and a product thereof. According to the method, firstly, a potassium permanganate reduction method is adopted to precisely synthesize the high-purity MnO2 nano-substrate, and according to the method, the size uniformity and dispersion stability of nano-particles can be precisely controlled by regulating and controlling the pH value and temperature of a reaction system and the concentration of a reducing agent. On the basis, amphiphilic high-molecular polyethylene glycol-polycaprolactone (PEG-PCL) is modified on the surface of the MnO2 nanometre. The whole preparation process is green and mild, and complex equipment is not needed; the reaction conditions are mild, nanoparticles are uniform, and the acoustic / photosensitizer can be combined and applied to an imaging technology to realize real-time monitoring.

The present invention relates to the technical field of antibacterial materials, and in particular to an antibacterial material comprising black talc and manganese oxide, and a preparation method thereof. The antibacterial material comprising black talc and manganese oxide loaded on its surface, wherein the manganese oxide comprises Mn3O4 and MnOOH. The antibacterial material is obtained by loading manganese oxide on the surface of the black talc using potassium permanganate, urea, and hexadecyltrimethylammonium bromide as raw materials and employing a hydrothermal reaction in-situ synthesis method. The present invention utilizes the unique layered structure of black talc and synthesizes manganese oxide on the surface of the black talc using a liquid phase in-situ synthesis method. The crystal phase and morphology of the manganese oxide are controlled by adding black talc and regulating the synthesis temperature. This material not only improves the stability of the manganese oxide, reduces aggregation, and exhibits high antibacterial properties, but also enhances its biocompatibility, exhibits low cytotoxicity and low hemolytic properties, and is suitable for various biomedical applications.

The invention discloses a preparation method of gardenia blue pigment. The preparation method comprises the following steps: (1) precipitating and removing impurities by copper sulfate: precipitating and removing impurities from column liquid after gardenia yellow is extracted by copper sulfate to obtain supernate; (2) oxidizing and decoloring by potassium permanganate and removing excessive copper ions: performing neutral oxidation on the supernate by potassium permanganate to obtain decolored supernate; (3) nanofiltration concentration and spray drying: carrying out alkaline nanofiltration concentration and spray drying on the decolorized supernatant to obtain a geniposide solid crude product; (4) extracting geniposide with propyl alcohol and recrystallizing: extracting the crude product with ethyl acetate and recrystallizing to obtain a fine geniposide product; (5) ethyl acetate two-phase acid hydrolysis: carrying out ethyl acetate two-phase acid hydrolysis and recrystallization on the refined product to obtain a genipin pure product; and (6) preparing a gardenia blue pigment pure product: reacting the genipin pure product with sodium isoleucine to obtain the gardenia blue pigment. The method is simple and easy to implement, convenient to operate, outstanding in product characteristics, easy in equipment type selection and matching, low in equipment investment, high in product additional value, good in economic benefit and capable of being mechanized.

The invention relates to the technical field of metallurgy, discloses a composite bentonite core material for metallurgical pellets as well as preparation and application of the composite bentonite core material, and aims to solve the technical bottlenecks that the TFe grade is low and the SiO2 content is high due to a large amount of bentonite in existing pellet production, and titanium-containing and high-sulfur fine iron powder pellets are easy to burst and insufficient in strength. The core material is formed by compounding 60% of corn gelatinized starch, 20% of sodium humate, 10% of lignosulfonate and 10% of macromolecular copolymer, and 2%-3% of borax or 2%-3% of polyacrylamide is added for titanium-containing iron fine powder for optimization; 3%-4% of potassium permanganate is added for optimization aiming at the high-sulfur iron fine powder. According to the composite bentonite, the compressive strength of finished product balls can be improved by 20%-30%, the ball cracking rate is reduced by 90% or above, the TFe grade is improved by 0.3%-1.3%, the multiple purposes of reducing the dosage, improving the grade and adapting to special fine powder are creatively achieved, and the composite bentonite has remarkable technical and economic values.

The invention discloses a preparation method and application of doped hierarchical porous manganese dioxide, and belongs to the field of catalyst preparation and air purification. According to the invention, potassium permanganate is used as a manganese source and an oxidizing agent, a modified reducing agent is added, mixing and stirring reaction are carried out at room temperature, and the doped hierarchical porous manganese dioxide catalyst is synthesized after washing, drying and high-temperature treatment. The preparation method is simple in preparation process and high in repeatability; the prepared manganese dioxide realizes doping of potassium ions and formation of oxygen vacancies, and the catalytic activity of the manganese dioxide is improved; the doped manganese dioxide catalyst has a multi-stage structure of micropores, mesopores and macropores, the multi-stage pore structure endows the doped manganese dioxide catalyst with a relatively large specific surface area, the physical adsorption capacity of the doped manganese dioxide catalyst can be improved, and meanwhile, more active sites are exposed, so that the doped manganese dioxide catalyst shows relatively high activity and stability in a reaction for catalytically oxidizing gaseous pollutant formaldehyde at room temperature.

The invention discloses MnO2 (at) ZIF-67 composite nanoparticles with high oxidase activity as well as a preparation method and application of the MnO2 (at) ZIF-67 composite nanoparticles. The preparation method comprises the following steps: uniformly mixing a potassium permanganate aqueous solution and a cerous nitrate aqueous solution to obtain a mixed solution I; and adding nitric acid into the mixed solution I, carrying out hydrothermal reaction to obtain a substance MnO2, uniformly mixing the obtained MnO2 and a methanol solution of PVP, adding cobalt nitrate hexahydrate and 2-methylimidazole, and standing to obtain the MnO2 ZIF-67 composite nanoparticles. The nano-particles with high enzymatic activity are prepared through a simple hydrothermal synthesis method, have good oxidase mimetic activity, catalyze O2 and TMB to rapidly develop color and become dark blue, and can specifically, sensitively and rapidly detect the total antioxidant capacity of cells, so that the nano-particles have good practical application value.

The invention discloses a sludge anaerobic acidogenesis strengthening method based on pyrohydrolysis and potassium permanganate synergistic degradation of melanoids. The method comprises the following steps: (1) screening sludge to remove impurities, and then carrying out gravity settling concentration; (2) pyrohydrolysis treatment: high-temperature and high-pressure treatment, pressure relief and cooling; (3) adding potassium permanganate for oxidation, and performing ultrasonic dispersion; (4) anaerobic fermentation: inoculating activated sludge, and controlling fermentation conditions; and (5) separating and extracting the short-chain fatty acid. Through the synergistic effect of pyrohydrolysis and potassium permanganate, melanoids generated in the pyrohydrolysis process are degraded in a targeted mode, the inhibition effect of melanoids on anaerobic microorganisms is eliminated, and meanwhile efficient dissolution of organic matter in sludge is promoted. Nano-manganese dioxide generated by oxidizing potassium permanganate serves as an electron transfer medium, the metabolic activity of acid-producing bacteria is further enhanced, and the acid pickling recovery rate is larger than or equal to 90%. According to the method, the yield of short-chain fatty acid is increased by 65% (as high as 456mg / g VS), high efficiency and environmental friendliness are achieved, and an innovative solution is provided for sludge resourceful treatment.

The invention provides an MXene synergistic composite phase change heat storage material and a preparation method thereof, and belongs to the technical field of phase change heat storage materials. Comprising the following steps: reacting graphite with mixed acid and potassium permanganate through an improved Hummers method, and carrying out centrifugal washing, dialysis and drying to obtain graphene oxide GO powder, dispersing MXene and the graphene oxide GO powder in deionized water, performing ultrasonic treatment, stirring and mixing, adding nanocellulose CNF and citric acid CA, continuing stirring, and performing directional freezing and freeze drying to obtain three-dimensional aerogel; the three-dimensional aerogel and molten paraffin are compounded through vacuum impregnation, and the MXene-based composite phase change heat storage material is obtained. The MXene-based composite phase change material prepared by the invention has high mechanical strength, can effectively prevent leakage during phase change of the organic PCMs, still keeps higher load rate and stable structure and shape after multiple cycles, and can be applied to the fields of microminiature thermal management and the like.

The invention provides a high-survival-rate forestry seedling raising method, and relates to the technical field of seedling raising. The method specifically comprises the following steps: S1, selecting seeds: selecting full and undamaged seeds with excellent genetic quality, soaking the seeds in a 0.3% potassium permanganate solution for 20 minutes, washing the seeds with clear water for three times, refrigerating the seeds for 15 days at 4 DEG C by adopting a variable-temperature stratification method, and sowing the seeds in a warm and humid environment of 15-20 DEG C for 5 days when the whitening rate reaches 80%; the method comprises the following steps: for hard-shell seeds, etching a micro-channel (the aperture is less than or equal to 10 microns) in a seed shell by adopting low-power pulse laser; coating the outer layers of the treated seeds with natural probiotics, burying the treated seeds into a simulated forest ant nest surface layer structure, and recovering the seeds with white buds after three weeks at constant temperature and humidity (22 + / -2 DEG C and humidity of 80%); s2, seedling culture on a seedling culture foundation bed. According to the method, in the whole process from the seeds to the nursery stocks, natural simulation, micro-ecology and reasonable regulation measures are adopted, the stress resistance and the survival rate of the nursery stocks are effectively improved, and the risk of nursery stock survival and subsequent management is reduced.

The invention discloses road and bridge anti-heavy load concrete and a preparation method thereof, relates to the technical field of concrete technology, and belongs to the patent classification number C04B28 / 00. The preparation method of the concrete comprises the following steps: firstly, impregnating and activating polypropylene fibers with a potassium permanganate acid solution, then treating with aminopropyltriethoxysilane to obtain interface modified fibers, preparing a suspension from the interface modified fibers, mixing with a premixed solution of nano silicon dioxide containing a water-borne epoxy resin emulsion, and reacting to obtain a fiber reinforced composite material; the preparation method comprises the following steps: mixing metakaolin and silica fume, adding waterborne polyurethane and carboxylated multi-walled carbon nanotubes, carrying out high-speed shearing, carrying out spray drying to obtain interface reinforced microspheres, carrying out dry mixing on cement, machine-made sand, granite gravel, mineral powder and a fiber reinforced material, adding a polycarboxylic acid water reducer solution, carrying out high-speed stirring, adding the microspheres, and carrying out medium-speed stirring to obtain the concrete. The concrete prepared by the invention has excellent mechanical strength, so that the heavy load resistance is realized.

The invention discloses a silicon carbide substrate rough polishing composition and a preparation method and application thereof, and belongs to the technical field of semiconductor device processing. The rough polishing composition for the silicon carbide substrate is a polishing composition obtained by adjusting the pH value of a basic system to 3-4 by using a pH regulator; the basic system comprises the following components in percentage by mass: 2-10% of an abrasive, 2-6% of a first oxidant, 2-10% of a second oxidant and 0.5-2% of a dispersing agent besides water; the first oxidant is potassium permanganate; the second oxidizing agent is potassium persulfate or ferric persulfate. According to the method, the combination of potassium permanganate and persulfate is used as an oxidizing agent, and the rough polishing efficiency and uniformity of silicon carbide are remarkably improved through oxidation potential complementation, acidic environment synergy, free radical catalysis chain reaction and surface wettability optimization.

This invention provides a temperature-resistant shape memory polymer plugging agent, its preparation method, and its application, belonging to the field of oil and gas drilling technology. The preparation method of this plugging agent includes the following steps: mixing acetic acid and perchloric acid to obtain a mixed acid, then adding bromate, potassium permanganate, and natural flake graphite, and stirring to obtain low-temperature expanded graphite; mixing cyanate ester, linear aliphatic epoxy resin, and an active diluent, then adding low-temperature expanded graphite, organotin compounds, and amine catalysts, and carrying out a curing reaction to obtain a temperature-resistant shape memory polymer material; testing the glass transition temperature (Tg) of the synthesized temperature-resistant shape memory polymer material, compressing it at (Tg+5)~(Tg+10)℃, and then cooling, pulverizing, and granulating to obtain the final product. The plugging agent of this invention can rapidly recover its original shape at high temperatures, accumulate and seal leakage channels, and form a high-strength sealing layer in fractures, meeting the requirements of safe and efficient drilling.

The invention discloses a purple phosphorus-manganese dioxide nano-composite enzyme as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The purple phosphorus-manganese dioxide nano-composite enzyme is formed by compounding a purple phosphorus nanosheet and nano-manganese dioxide through in-situ mineralization, and the surface of the purple phosphorus-manganese dioxide nano-composite enzyme is modified with methoxy polyethylene glycol amine. The preparation method comprises the following steps: preparing a purple phosphorus nanosheet material through ultrasonic liquid phase stripping; and at room temperature, dropwise adding a potassium permanganate aqueous solution into the purple phosphorus nanosheet material aqueous solution, then adding a methoxy polyethylene glycol amine aqueous solution, stirring overnight, and centrifugally collecting precipitate to obtain the purple phosphorus-manganese dioxide nano compound enzyme. The purple phosphorus-manganese dioxide nano-composite enzyme provided by the invention is composed of a manganese dioxide nano-material with self-enhanced chemical kinetic catalytic performance and a purple phosphorus nanosheet with near-infrared photothermal conversion performance, and the effect of killing tumor cells under NIR-II synergistic chemical kinetic catalysis can be realized.

The invention belongs to the field of nano materials, and particularly relates to a C and N co-doped three-dimensional manganese oxide nano material as well as a preparation method and application thereof. The invention relates to a preparation method of a C and N co-doped three-dimensional manganese oxide nano material, which comprises the following steps: (1) mixing urea and potassium chloride, adding water, grinding into paste, freeze-drying the mixture, calcining, and naturally cooling to room temperature to obtain a C and N co-doped precursor; (2) adding the precursor into a potassium permanganate solution, and carrying out heating and stirring reaction; and (3) after the reaction is finished, centrifuging by using water and absolute ethyl alcohol, cleaning, separating, collecting a product, and drying to obtain the C and N co-doped three-dimensional manganese oxide nano material. The C and N co-doped three-dimensional manganese oxide nano material is of a unique micron flower spherical structure assembled by three-dimensional nanosheets, and is uniform in size, good in dispersity and large in specific surface area. According to the nano material, the charge transfer performance and the PMS activation capability are improved, so that the nano material has more excellent catalytic activity.

The present application belongs to the technical field of waste oil recycling, and particularly relates to a method for recycling and processing by-products of edible vegetable oil processing, comprising the following steps: S1, mixing raw materials with deionized water and potassium permanganate, wherein the raw materials comprise soapstock, oil foot and deodorized distillate; S2, performing gradient separation treatment on the mixed liquid obtained in step S1, wherein the gradient separation treatment comprises centrifugal separation, mixed solvent extraction and ultrasonic-assisted separation; and S3, recycling oil and fat products and solid products obtained in step S2. The present application realizes the collaborative treatment of multiple types of by-products, the comprehensive recovery rate of oil and fat reaches more than 85%, the energy consumption is reduced by 35%, the use of strong acid and strong base is avoided, it is green and environmentally friendly, the operation is simple, and it is suitable for industrial application.

The present invention provides a doped manganese-molybdenum oxide catalyst, a preparation method, and a method for catalytically removing VOCs using the same, and relates to the technical field of inorganic materials and air pollution control. The preparation method provided by the present invention uses potassium permanganate, manganese sulfate, and molybdate as raw materials, and distilled water as a solvent, and is prepared by a hydrothermal reaction. The preparation method provided by the present invention is simple and easy to operate, has a large output, and is environmentally friendly. The reaction temperature required for the catalytic removal of VOCs by the prepared catalyst is low, and it can remove more than 90% of benzene at 230°C. It has strong adaptability and still has high catalytic activity in complex atmospheres such as high moisture, particulate matter, and SO2. The catalyst also has strong durability and recyclability, can be used for long-term work in industry, and can work efficiently in industrial environments that require alternating hot and cold temperatures.

The invention discloses a preparation method of manganese dioxide nano-enzyme and application of the manganese dioxide nano-enzyme in a disease detection kit.The preparation method of the manganese dioxide nano-enzyme comprises the following steps that a fish peptone solution containing fish peptone powder and a potassium permanganate aqueous solution are mixed to be uniform, a mixed solution is obtained, the mixed solution is stirred to be brown, and a manganese dioxide nano-enzyme solution is obtained; the manganese dioxide nano-enzyme has an ultra-small particle size of 2-5nm, overcomes the problem that the traditional nano-enzyme is small in particle size and easy to agglomerate, and has excellent dispersity and stability; in addition, the manganese dioxide nano-enzyme prepared from the fish peptone powder has high peroxidase-like activity and stability, and the enzyme activity of the manganese dioxide nano-enzyme is 2.36 times higher than that of HRP in a brucellosis detection ELISA kit.

The invention discloses a method for removing diatom through combination of pre-oxidation of sodium hypochlorite and potassium permanganate and coagulative precipitation enhancement, and belongs to the technical field of water treatment. The method comprises the following steps: adding sodium hypochlorite and potassium permanganate into diatom-containing water step by step, and carrying out a combined pre-oxidation reaction for 30-60 minutes; and then adding a coagulant to react, and standing and precipitating for about 60 minutes, so that the diatom cells in the water can be efficiently removed. Aiming at the problems of low diatom oxidation removal rate, poor coagulation effect, filter tank blockage and the like in a conventional water treatment process, straight-chain diatom cell membrane structures are primarily destroyed through sodium hypochlorite, negative electricity groups on cell surfaces are exposed, and a favorable reaction interface is provided for potassium permanganate; in-situ manganese dioxide generated by further adding potassium permanganate can coat cells and neutralize surface charges, and an ideal condition is created for the coagulant to form an adsorption bridge, so that a coagulation interface is remarkably improved, and the removal efficiency of diatom cells is improved.