682 results about "Potassium permanganate" patented technology

The invention discloses a dosing system for pre-oxidation enhanced coagulation in a water plant and an intelligent regulation and control method, and relates to the technical field of pre-oxidation enhanced coagulation water treatment. The system comprises a raw water pump, a mixing tank, a tubular static mixer, a flocculation tank, a sedimentation tank, an industrial personal computer and multiple online detection instruments which are sequentially connected in series, so as to monitor the flow, conductivity, pH value, temperature, turbidity, ultraviolet absorbance and organic matter concentration of raw water. Key water quality indexes are monitored in real time through data collection and a pre-oxidation enhanced coagulation regulation and control system based on machine learning of an industrial personal computer, and intelligent and accurate prediction of the dosage of oxidants (potassium permanganate, permanganate composite agents and potassium ferrate) and coagulants is achieved; the effluent turbidity, the effluent ultraviolet absorbance and the effluent organic matter concentration of the sedimentation tank are fed back in real time, the adding amount of the oxidizing agent and the coagulant is dynamically adjusted through a regulation and control algorithm, the effluent quality is guaranteed, and medicine consumption is reduced.

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 relates to a nanometer aluminum oxide polishing solution for a silicon carbide substrate slice as well as a preparation method and application of the nanometer aluminum oxide polishing solution. The nano aluminum oxide polishing solution is prepared from the following components in percentage by weight: 0.5 to 6.0 percent of alpha-Al2O3 abrasive, 0.5 to 5.0 percent of oxidant, 0.1 to 1.0 percent of pro-oxidant, 0.05 to 0.50 percent of pH (Potential of Hydrogen) regulator, 0.10 to 0.50 percent of dispersing agent and the balance of water, the D10 of the alpha-Al2O3 grinding material ranges from 0.100 to 0.140 [mu] m, the D50 of the alpha-Al2O3 grinding material ranges from 0.180 to 0.230 [mu] m, the D90 of the alpha-Al2O3 grinding material ranges from 0.240 to 0.300 [mu] m, the D100 of the alpha-Al2O3 grinding material ranges from 0.340 to 0.420 [mu] m, and The preparation method of the alpha-Al2O3 abrasive material comprises the following steps: preparing alpha-Al2O3 powder into alpha-Al2O3 slurry, adding potassium citrate, grinding, and carrying out particle classification on the alpha-Al2O3 slurry after grinding, so as to obtain the alpha-Al2O3 abrasive material. Compared with the prior art, graded alpha-Al2O3 is selected as abrasive particles for silicon carbide polishing, potassium permanganate with higher oxidability is selected as an oxidizing agent, and the prepared nanometer aluminum oxide polishing solution is applied to chemical mechanical polishing of a silicon carbide substrate slice; the surface roughness of the silicon carbide substrate slice is reduced while the removal rate of the silicon surface material of the silicon carbide substrate slice is improved, and the atomic-scale smooth surface quality is obtained.

The invention discloses a preparation method and application for preparing a cobalt-doped manganese dioxide material by taking Co3 [Co (CN) 6] 2 as a hard template, and belongs to the technical field of electrode material preparation. The preparation method comprises the following steps: firstly, preparing a Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material through a liquid phase coprecipitation reaction method; and then preparing the cobalt-doped manganese dioxide material with a loose porous structure by taking the Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material as a hard template and potassium permanganate as a reaction raw material and adopting a hydrothermal synthesis method, specifically, forming a submicron cube with the size of 200-700nm by combining nanosheets with the thickness of about 10-20nm, and preparing the cobalt-doped manganese dioxide material with the loose porous structure by adopting a hydrothermal synthesis method. And an optimization strategy of Co atom doping of manganese dioxide and nanosheet morphology control is synchronously completed. When the material is used as an electrode material, the conductivity of the manganese dioxide electrode material is greatly improved, the capacity of an aqueous zinc ion battery is improved, and the material has excellent charge-discharge cycle stability.

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 preparation method and application of oxide coated multifunctional resin, and belongs to the technical field of new material preparation and advanced oxidation. The preparation method comprises the following steps: firstly preparing a coupling agent alcohol-water solution swelling resin, then mixing the resin with a potassium permanganate solution, then dropwise adding a mixed solution containing low-valence metal and Mn < 2 + >, forming an oxide layer on the surface of the resin after an oxidation-reduction reaction, and finally regulating and controlling the loading capacity of the oxide layer by adopting hydrothermal synthesis. According to the method, the amphiphilic characteristic of the coupling agent is utilized, so that the combination of the oxide and the resin is firmer, the active components are not easy to wear and fall off, the material performance is improved, and the service life is prolonged. The material has excellent VOCs adsorption capacity under high humidity, the outer-layer oxide has Fenton-like catalytic performance, VOCs are catalytically decomposed at normal temperature, and secondary pollutants such as nitric oxide and dioxin are prevented from being generated. And after the VOCs are adsorbed and saturated, the material can be recycled and regenerated through an advanced oxidation technology and is repeatedly used, so that the treatment cost of the VOCs is reduced.

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 present invention belongs to the technical field of lithium-ion batteries and relates to a method for preparing a surface-coated manganese dioxide negative electrode material. The present invention discloses a method for preparing a surface-coated manganese dioxide negative electrode material, wherein manganese sulfate and potassium permanganate are dissolved in deionized water, and then the entire solution is transferred into a polytetrafluoroethylene-lined autoclave, and subjected to a high-temperature hydrothermal reaction. The precipitate after the reaction is washed and dried to obtain a product MnO 2 , the prepared MnO 2 Re-disperse in deionized water and add copper acetate, (NH 4 ) 6 Mo 7 O 24 •4H 2 O; add folic acid ethanol solution to the above dispersion, stir at room temperature for several hours, separate and wash the precipitate, dry the precipitate and calcine it in an argon atmosphere in a tube furnace to obtain a coated manganese dioxide negative electrode material. The surface coating layer of the manganese dioxide negative electrode material of the present invention is molybdenum oxide, copper and nitrogen-doped carbon, and the three components in the coating layer enhance the electrochemical properties of the composite material through a synergistic effect.

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 discloses a filtrate reducer based on modified humic acid and a preparation method of the filtrate reducer, and relates to the technical field of oilfield chemistry. The preparation method of the filtrate reducer comprises the following steps: taking modified humic acid, N, N-dimethylacrylamide, N-vinyl imidazole, long-chain acrylate and hydroxyethyl acrylate, dissolving in a solvent, then adding an initiator, and reacting to obtain the filtrate reducer, wherein during preparation of the modified humic acid, firstly, the modified humic acid is activated by low-concentration potassium permanganate, and then the activated modified humic acid reacts with methyl chlorosilane. The filtrate reducer prepared by the preparation method disclosed by the invention has relatively good temperature-resistant and salt-resistant performance and relatively good filtrate reduction performance. The preparation method is simple, the raw materials are simple and easy to obtain, the cost is low, and popularization is easy.

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 discloses a treatment method for improving germination and saline-alkaline tolerance of gordon euryale seeds, and belongs to the field of aquatic plant breeding and planting, the gordon euryale seeds subjected to disinfection treatment are mixed with fine sand, then the sand-buried seeds are put into a breathable woven bag to be stored, and the storage temperature is 4 + / -2 DEG C. According to the storage method for improving germination and saline-alkaline tolerance of the gordon euryale seeds, provided by the invention, the maturity of the seeds can be ensured by controlling the collection time and color; a water separation method is adopted to ensure the quality of mature seeds; potassium permanganate is adopted for disinfection to ensure that the seeds do not mildew; low-temperature sand storage is adopted to ensure seed quality and break dormancy; and the germination rate and the germination potential are further improved by a variable-temperature germination promoting technology after storage. The method provided by the invention is simple to operate, and can be flexibly implemented according to design parameters in combination with actual facility conditions so as to improve the germination and saline-alkaline tolerance of the gordon euryale seeds.

The invention relates to the technical field of waste gas treatment, in particular to potassium permanganate production waste gas treatment equipment with an aggregate purification function, the waste gas treatment equipment comprises a base, a spray tower and a fan, the spray tower is arranged on the base, and the fan is arranged on the outer side of the base; compared with an existing waste gas treatment device, the waste gas treatment device is provided with the material collecting assembly, the material collecting assembly can conduct centralized treatment on particulate matter intercepted on the filter screen on the basis of guaranteeing waste gas flowing, and meanwhile the situation that the particulate matter intercepted on the filter screen is blocked in the moving process of the filter screen can be avoided; the waste gas purification device is further provided with a filler assembly, the height of the filler assembly can be adjusted in time according to the flow speed of the waste gas and the flow of the alkaline solution, and therefore it is guaranteed that the time of the alkaline solution staying in the filler layer is long enough on the basis that it is guaranteed that the alkaline solution smoothly passes through the filler assembly.

The invention discloses a synthesis method of methyl 4-formylbutyrate, and belongs to the technical field of chemical synthesis, methyl acrylate and nitromethane are subjected to a Michael addition reaction under the action of a catalyst to prepare methyl 4-nitrobutyrate, and the excessive undissolved catalyst can be recycled after being filtered; the method comprises the following steps: under the action of sodium tert-butoxide and potassium permanganate, carrying out hydrolytic oxidation reaction on methyl 4-nitrobutyrate, adding a sodium hydrogen sulfite aqueous solution and a sulfuric acid solution after the reaction is completed, consuming excessive potassium permanganate oxidant, reducing by-products, and carrying out purification treatment to obtain high-purity methyl 4-formyl butyrate. The synthesis method provided by the invention has the advantages of cheap and easily available raw materials, simple operation, easily controllable conditions, high total yield and easy realization of industrial production.

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 invention belongs to the technical field of biological plasticization, and provides a bleaching method for a specimen with hydroxyheme deposition caused by formaldehyde oxidation. The method comprises the following steps: soaking a specimen in a potassium permanganate solution for reaction to obtain a specimen with dark brown deep muscles; soaking the obtained specimen with dark brown deep muscles in an oxalic acid solution for reaction to obtain a specimen with reddish deep muscles; the obtained specimen with the deep muscle being reddish is soaked in hydrogen peroxide for a reaction, the deep muscle of the specimen is close to white, and bleaching of the specimen is completed; the specimen is a specimen of hydroxyheme deposition caused by formaldehyde oxidation. According to the method, the dark red color of the hydroxyheme deposition specimen caused by formaldehyde oxidation can be effectively removed, the specimen color is closer to white, meanwhile, the integrity of the specimen can be guaranteed, and teaching, exhibition and biological plasticization are better facilitated.

The invention relates to the technical field of graphite materials, and provides a method for preparing expanded graphite with high expansion volume through activation or pretreatment. Natural crystalline flake graphite, potassium permanganate, concentrated sulfuric acid and an activating agent are mixed for an oxidation intercalation reaction, and then high-temperature expansion is performed to obtain high-expansion-volume graphite; or, the natural flake graphite is pretreated by adopting the pretreating agent, and then the oxidation intercalation reaction and high-temperature expansion are performed to obtain the high-expansion-volume graphite. Through activation or pretreatment, the expansion volume of the expanded graphite can be increased, especially when the pretreatment method is adopted, the expanded graphite with the expansion volume obviously increased can be prepared on the basis of reducing the usage amount of the oxidizing agent and the intercalator, and the expansion effect is more remarkable.

The invention discloses preparation and application of amorphous manganese dioxide nanoparticles and a supercapacitor. The preparation method comprises the following steps: cooling a potassium permanganate aqueous solution to not more than 4 DEG C; adding ethanol into the cooled potassium permanganate aqueous solution, and stirring and reacting at the temperature of not more than 4 DEG C to obtain a first product; and centrifuging the first product to obtain a precipitate, and drying to obtain the amorphous manganese dioxide nano-particles. The amorphous manganese dioxide nanoparticles can be applied to an electrode active material, and the electrode active material can be further applied to a supercapacitor. The high-capacity asymmetric supercapacitor assembled by the amorphous MnO2 (12.6 mg.cm <-2 >) and the activated porous carbon (APC, 22.4 mg.cm <-2 >) has the ultrahigh surface energy density of 780.3 mu Wh.cm <-2 >. In addition, after 8000 times of circulation, the excellent circulation stability of 98% of initial capacitance retention rate is realized, and the requirements of commercial energy storage equipment are met.

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 provides a preparation method of a material for selective adsorption of iodine-131 nuclide, and belongs to the technical field of nuclear medicine radioactive wastewater purification treatment.The preparation method comprises the steps that graphite powder, concentrated sulfuric acid, phosphoric acid, potassium permanganate and hydrogen peroxide serve as raw materials to synthesize graphene oxide in a membrane uniform distribution type microreactor; taking the graphene suspension and Zn (NO3). 6H2O as raw materials to synthesize nanoporous graphene in a membrane uniform distribution type microreactor; and sequentially filtering the graphene oxide solution, the nanoporous graphene solution and the graphene oxide solution on a basement membrane to obtain the graphene oxide / nanoporous graphene / graphene oxide two-dimensional separation membrane. According to the preparation method of the material for selective adsorption of the iodine-131 nuclide, provided by the invention, the prepared material for selective adsorption of the iodine-131 nuclide is good in selectivity, high in adsorption capacity and strong in stability.

The utility model discloses a low-temperature evaporation treatment zero-discharge device for potassium permanganate wastewater treatment, which comprises a wastewater collecting device, a PH adjusting device is arranged on one side of the wastewater collecting device, an oxalic acid dosing device is connected onto the PH adjusting device, a diaphragm filter press is connected onto the PH adjusting device, and the diaphragm filter press is connected onto the other side of the wastewater collecting device. A squeezing water tank is arranged on one side of the diaphragm filter press, a diaphragm pump is connected to the diaphragm filter press, the diaphragm pump connected with the diaphragm filter press is connected with a PH adjusting device, a liquid filtering device is arranged on one side of the PH adjusting device, and a low-temperature evaporator is arranged on one side of the liquid filtering device. The potassium permanganate wastewater low-temperature evaporation treatment zero-discharge device has the beneficial effects that the wastewater treatment effect is effectively improved, the wastewater treatment cost is effectively reduced, and in addition, the technical scheme is short in treatment process flow, simple in operation flow, relatively high in treatment efficiency, good in purification effect, good in impurity filtration effect and good in color removal effect.