176 results about "Potassium manganate" patented technology

The invention relates to a preparation method of a ZIF-67 derived cobalt-manganese catalyst and application of the ZIF-67 derived cobalt-manganese catalyst in catalytic oxidation of benzene, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: preparing a ZIF-67 precursor; dispersing ZIF-67 in water to form a turbid liquid, and adding a potassium permanganate aqueous solution to carry out an etching reaction to obtain a mixed system; transferring the mixed system into a reaction kettle for hydrothermal reaction to obtain a black precipitate; and washing the black precipitate, drying, roasting, and grinding to obtain the ZIF-67 derived cobalt-manganese catalyst. According to the preparation method, the problem that residues are usually easy to remain in the conventional preparation method of the ZIF-67 catalyst is solved, and the Co-Mn8-T140 catalyst prepared by the preparation method disclosed by the invention can realize 90% of benzene conversion rate at the reaction temperature of about 210 DEG C under the reaction conditions that the air speed is up to 60000mL / (g.h), the benzene concentration is 1000ppm and the oxygen content is 20%.

The present invention discloses a titanium dioxide / manganese dioxide / carbon composite catalyst supported on a macroscopic carrier, a preparation method thereof and an application. The preparation process is as follows: titanium dioxide is added to deionized water, stirred, potassium permanganate is added, and stirring is continued; a carbon source is added, after stirring evenly, a macroscopic carrier is added, ultrasonic mixing is carried out, and reaction is carried out under water bath conditions. After the reaction is completed, it is cooled and dried to obtain the product. Compared with the existing formaldehyde removal materials, through the mutual synergistic effect among the components of the composite catalyst in the present invention, that is, the photo-thermal synergistic catalytic oxidation under light conditions and the adsorption / catalytic oxidation under dark conditions act together to mineralize formaldehyde into environmentally harmless water and carbon dioxide. In addition, the preparation method of the present invention has a simple operation process and low raw material prices. Combining the support on a macroscopic carrier and the synergistic effect among the composite catalysts, it has the characteristics of a wide range of applicable scenarios, convenient subsequent recovery, and all-weather formaldehyde removal, and has broad application prospects.

The invention belongs to the technical field of lithium ion battery electrode materials, and particularly discloses a diameter-controllable one-dimensional lithium manganate nanorod as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing manganese sulfate, potassium permanganate, a structure-directing agent and a surfactant into a solvent, and carrying out hydrothermal reaction to obtain a black precipitate; sintering the black precipitate to obtain a manganese dioxide nanorod; and mixing the manganese dioxide nanorod with lithium hydroxide, and carrying out two-stage sintering to obtain the one-dimensional lithium manganate nanorod. The prepared lithium ion battery anode material is uniform in thickness and very small in surface energy, can effectively shorten the transmission path of lithium ions when being used as an anode material, is not easy to agglomerate, has good flexibility, can maintain the structural integrity in a large-current long-time service process, and is beneficial to improving the rate and cycle performance of an electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of manganese dioxide can be accurately adjusted, and controllable preparation of one-dimensional lithium manganate is realized.

The invention relates to the technical field of catalysts, and provides a catalyst and a preparation method thereof, and an application of the catalyst in carbon dioxide-based degradable plastics, the catalyst is a supported catalyst, and comprises a carrier and an active component; the carrier comprises ternary hydrotalcite, and the active component comprises double metal cyanide and a rare earth yttrium complex; the raw material of the double metal cyanide comprises a cyano coordination compound; the cyano coordination compound comprises potassium hexacyanomanganate and / or potassium hexacyanocobaltate. According to the technical scheme, the problems of low yield and more byproducts when the catalyst is used for catalyzing and preparing the carbon dioxide-based degradable plastic in the related technology are solved.

The invention discloses a preparation method of a low-iridium-content catalyst for PEM electrolyzed water anode oxygen evolution, and belongs to the field of PEM electrolyzed water. The method comprises the following steps: (1) dissolving a manganese salt, potassium permanganate and a cerium salt in water, adding an acid, adjusting the pH value to 3-7, uniformly stirring, and aging to form a uniform suspension; then transferring into a reaction kettle, and carrying out hydrothermal reaction; roasting by using a muffle furnace to obtain a cerium-manganese-based metal oxide carrier; (2) adding iridium salt into deionized water, stirring, and carrying out ultrasonic dispersion to obtain an iridium-containing precursor solution; and adding the iridium-containing precursor solution into the cerium-manganese-based metal oxide carrier suspension, stirring and mixing, then carrying out ball milling treatment, washing and drying to obtain the supported low-iridium-content catalyst, namely the low-iridium-content catalyst for PEM electrolytic water anode oxygen evolution. The use amount of Ir is reduced, more active sites of Ir are exposed, and the performance of the catalyst is improved.

The invention discloses a preparation method of a metal-doped manganese dioxide aqueous zinc ion battery positive electrode material, which comprises the following steps of: preparing a solution from any one of potassium permanganate, potassium manganate, sodium permanganate and sodium manganate, and recording the solution as a solution A; preparing a solution from any one of oxalic acid, citric acid, formic acid, acetic acid, sodium hydrogen sulfite and phosphorous acid, and recording the solution as a solution B; 2-10 ml of the solution B and aluminum salt are weighed and added into the solution A, ultrasonic dispersion is carried out, stirring is carried out for 20-120 min, and a mixed solution is obtained; and transferring the mixed solution into a polytetrafluoroethylene high-pressure reaction kettle, putting the polytetrafluoroethylene high-pressure reaction kettle into a drying oven at 120-180 DEG C, carrying out heating reaction for 10-24 hours, naturally cooling to room temperature, washing the reactant with water and ethanol, centrifuging, and carrying out vacuum drying to obtain the aluminum-doped delta-MnO2 positive electrode material. The positive electrode material is applied to the field of aqueous zinc ion batteries, the specific capacity of the battery positive electrode is extremely high, the battery positive electrode has very excellent cycling stability and high-rate charge-discharge characteristics, and raw materials used for synthesis are non-toxic and low in price.

The invention discloses a polydopamine-tea polyphenol coated copper manganese oxide composite nano-enzyme as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. According to the invention, a DA-Cu (II)-EGCG (epigallocatechin gallate) complex is formed by virtue of chelation of main components of dopamine and tea polyphenol, namely epigallocatechin gallate, and copper ions; potassium permanganate is introduced for oxidative polymerization to obtain the polydopamine-tea polyphenol / copper manganese oxide organic-inorganic hybrid nano composite material, the nano composite material is monodisperse nano particles, the average particle size is about 80 nm, the nano composite material shows excellent nano enzyme catalytic activity, active oxygen free radicals can be effectively removed, and the nano composite material can be used for preparing nano-enzyme. The material has good photo-thermal conversion performance under near-infrared light, and shows excellent photo-thermal and photodynamic synergistic antibacterial effects. The preparation method disclosed by the invention is simple, mild, environment-friendly, low in cost and convenient for batch production.

The invention provides a CMP polishing solution failure evaluation and compensation method, and relates to the technical field of silicon carbide processing. The failure evaluation method comprises the steps that after the polishing solution is recycled for a period of time, the oxidability, the average grain diameter of abrasive particles and the pH value of the polishing solution are measured, and if the oxidability, the average grain diameter of the abrasive particles and the pH value are all larger than preset values, the polishing solution continues to be used for polishing the next batch of workpieces; and if the oxidability and / or the average grain size of the abrasive grains and / or the pH value are / is smaller than the preset value, the polishing solution is affirmed to be invalid and cannot be continuously used for polishing, and the invalid polishing solution is compensated. The compensation method comprises the following steps: if the measured oxidability and / or average grain diameter of abrasive grains and / or pH value are / is smaller than a preset value, correspondingly adding a potassium permanganate solution, an aluminum oxide suspension and a pH regulator into the polishing solution respectively to enable the three indexes to return to be higher than the preset value, so as to finish the compensation of the invalid polishing solution. The economic cost of frequently replacing the polishing solution can be reduced, and pollution to the environment during waste liquid treatment is reduced.

The invention belongs to the technical field of electromagnetic wave absorbing materials, and particularly relates to a wave absorbing material and a preparation method and application thereof. Multi-walled carbon nanotubes (MWCNT), potassium permanganate (KMnO4) and a divalent manganese source are used as raw materials, in-situ uniform loading of MnO2 nanoparticles on the surface of the MWCNT can be realized through simple stirring in a room-temperature liquid-phase environment based on an oxidation-reduction reaction between Mn < 2 + > and MnO4 <->, and the wave-absorbing property of the MnO2-loaded MWCNT wave-absorbing material is superior to that of most similar wave-absorbing materials. Compared with a preparation method of a traditional wave-absorbing material, the technical route has the remarkable advantages that the preparation process is easy and convenient to operate, no pollutant is discharged, the process is energy-saving and environment-friendly, the material structure is adjustable and controllable, the wave-absorbing performance is excellent, and large-scale application can be achieved. According to the method, the technical limitation in the preparation process of the wave-absorbing material is effectively broken through, and a brand new scalable normal form is provided for green and large-scale production of the high-performance wave-absorbing material.

The invention relates to the technical field of nicotinic acid synthesis, and particularly discloses an efficient nicotinic acid synthesis method based on step-by-step feeding dynamic control, which comprises the following specific steps: step 1, uniformly dividing potassium permanganate into 3 parts, adding the potassium permanganate into an aqueous solution containing 3-methylpyridine every 15 + / -5 minutes, and supplementing 5-8mL of water after each addition; 2, reacting at 70-90 DEG C for 2-4 hours, and filtering while the solution is hot; 3, adding sodium dithionite into the filtrate, wherein the mass of the sodium dithionite is 0.4-0.6 time that of the potassium permanganate; and 4, concentrating the filtrate to 30-50% of the original volume, adjusting the pH value to 3.0-3.5 with acid, and crystallizing to obtain the nicotinic acid. The method has the following effects: the yield is up to 89.52% at most; the cost is reduced: the consumption of hydrochloric acid is reduced by 77%, and the consumption of potassium permanganate is optimized by 16.7%; the efficiency is improved; the reaction time is shortened by 50%; the large fluctuation of the reaction temperature is controlled through step-by-step feeding, the problem that the reaction liquid which is not completely reacted is too alkaline is solved by filtering and adding sodium dithionite, and the false yield is eliminated through the purification and concentration step while the yield is further improved.

The application discloses a method for degrading organic pollutants in water by using molybdenum disulfide activated potassium permanganate, which comprises sequentially adding molybdenum disulfide powder and potassium permanganate into water containing trace organic pollutants, treating for 10-90 minutes, and then removing unreacted potassium permanganate and molybdenum disulfide powder through coagulation, sedimentation and filtration in sequence; when the concentration of the trace organic pollutants in the water is 0.1-5 muM, the adding amount of the potassium permanganate is 50-300 mu mol / L, and the adding amount of the molybdenum disulfide is 25-150 mg / L; when the concentration of the trace organic pollutants in the water is greater than 5 muM, the adding amount of the potassium permanganate is 150-500 mol / L, the adding amount of the molybdenum disulfide is 50-200 mg / L, and the adding ratio of the molybdenum disulfide to the potassium permanganate is 1:(0.4-0.8). The method can enhance the degradation capacity of the potassium permanganate by adding the molybdenum disulfide, improve the removal rate of the organic pollutants, reduce the adding amount of the potassium permanganate agent, finally reduce the cost of water treatment, and effectively alleviate the chroma problem caused by a high adding amount of the potassium permanganate.

The invention belongs to the field of catalysts, and particularly relates to a supported foam nickel catalyst for catalytic combustion of low-carbon alkane and aromatic hydrocarbon and a preparation method of the supported foam nickel catalyst. According to the invention, the strong oxidizing property of the acidic potassium permanganate is utilized to etch the foamed nickel, the capacity of the carrier for supporting the active component is improved, the non-noble metal active component is introduced through a simple impregnation method, the method has the advantages of simple operation, low preparation cost, high universality and the like, and the problems of low introduction amount of the active component, poor catalytic activity and the like of the foamed nickel catalyst are solved. The catalyst disclosed by the invention not only can be used for catalytic combustion of low-carbon alkane such as ethane and propane, but also can be used for catalytic combustion of other non-low-carbon alkane VOCs (Volatile Organic Compounds), and has a good application prospect.

The invention relates to the field of silkworm breeding, in particular to a composite disinfection method suitable for a silkworm house and a silkworm rearing instrument. The composite disinfection method comprises the following steps: S1, carrying out physical and chemical combined preliminary disinfection; S11, cleaning and airing a movable instrument, and cleaning and disinfecting the silkworm house by using ultraviolet rays; s12, disinfecting the movable appliance and the silkworm house by using a chemical agent; s2, deep disinfection is conducted, specifically, a cinnamyl aldehyde and potassium permanganate mixed solution is taken to disinfect a silkworm house, then sulfur powder is used for fumigation disinfection, exhaust is conducted till no pungent smell is left, and the cinnamyl aldehyde and potassium permanganate mixed solution is prepared from cinnamyl aldehyde, water and potassium permanganate according to the volume ratio of 3-4: 5: 1-2; s3, disinfection before the silkworm period. Compared with the prior art, the disinfection method has the advantages that after the silkworm room and the silkworm rearing instrument are disinfected, few sedimentation bacteria are detected on the silkworm room and the silkworm rearing instrument, nuclear polyhedrosis viruses are not detected in silkworm bodies, the silkworm death rate is reduced to 0.3-1.1% and is far lower than that of other disinfection methods when the silkworm room or the silkworm rearing instrument is used for trial breeding of silkworm eggs, and the effect is extremely good.

The application belongs to the technical field of lithium ion battery electrode materials, and specifically discloses a one-dimensional lithium manganate nanorod with controllable diameter and a preparation method and application thereof. The application disperses manganese sulfate, potassium permanganate, a structure directing agent and a surfactant into a solvent, carries out a hydrothermal reaction, and obtains black precipitate; then the black precipitate is sintered to obtain manganese dioxide nanorods; the manganese dioxide nanorods are mixed with lithium hydroxide, and two-stage sintering is carried out to obtain one-dimensional lithium manganate nanorods. The one-dimensional lithium manganate nanorods are uniform in thickness and have very small surface energy, when used as a positive electrode material, can effectively shorten the transmission path of lithium ions, are not prone to agglomeration and have good flexibility, can maintain the integrity of the structure during long-time service under a large current, and are beneficial to improving the rate and cycle performance of the electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of the manganese dioxide can be accurately adjusted, and the controllable preparation of the one-dimensional lithium manganate can be realized.

The invention discloses a potassium permanganate solution batching system, a use method thereof and a system controller, and belongs to the technical field of jeans production equipment. The batching system comprises a stock solution preparation module, a formula batching module and a monkey wash module. The stock solution preparation module comprises a stock solution preparation tank and a stock solution tank; the stock solution preparation tank is used for preparing a potassium permanganate solution with a preset concentration and discharging and storing the potassium permanganate solution into the stock solution tank; the formula batching module comprises a formula premixing tank and a liquid outlet pipeline, the formula premixing tank is connected with the stock solution tank and the liquid outlet pipeline, and the formula premixing tank is used for diluting the solution and discharging the diluted solution through the liquid outlet pipeline. And the monkey wash module comprises a monkey wash premixing tank and a monkey wash liquid storage tank which are connected in sequence. And the monkey wash premixing tank is used for diluting the potassium permanganate solution in the stock solution tank and conveying the diluted potassium permanganate solution to the monkey wash solution storage tank. According to the potassium permanganate solution batching system disclosed by the invention, a stock solution with stable concentration and uniform property is prepared by accurately controlling the proportion of raw materials, so that the accuracy of a subsequent diluent and a gradient concentration solution is ensured from the source.

The invention discloses a high-efficiency purification method of a single-walled carbon nanotube, which belongs to the technical field of nano material preparation and treatment, and comprises the following steps: pre-oxidizing an original single-walled carbon nanotube in an acidic potassium permanganate solution, and carrying out microwave liquid-phase selective heating treatment to promote a carbon shell wrapping a metal catalyst to break, so as to obtain the high-efficiency purification method of the single-walled carbon nanotube. Then, the exposed metal core is effectively dissolved through mixed acid pickling, and finally, the high-purity single-walled carbon nanotube is obtained through washing and drying. According to the method, through the synergistic effect of pre-oxidation and microwave heating, carbon-coated iron and other stubborn impurities are efficiently and deeply removed, meanwhile, the structural integrity of the carbon tubes is protected to the maximum extent, the problems that impurities are difficult to remove and the carbon tubes are prone to being damaged in a traditional acid pickling method are solved, and the method is suitable for industrial production. And the defects of harsh conditions and poor controllability of a high-temperature oxidation method are overcome, so that the final product has high purity, low structural defects and good dispersity, and the application requirements of the fields of high-end electronics, composite materials, energy storage and the like on high-performance carbon nanotube materials are met.

This disclosure relates to a manganese-containing graphene composite material, its preparation method, and its uses. The method includes: mixing graphite, potassium permanganate, and concentrated acid, heating and reacting them, then adding water and stirring to obtain a mixed solution; mixing the mixed solution with optional hydrogen peroxide, and refluxing it under intermittent ultrasonic stirring, so that the resulting material is separated into solid and liquid phases to obtain a solid product; calcining the solid product under an inert atmosphere; the intermittent ultrasonic stirring step includes: (1) ultrasonic stirring for 5-30 min and then stopping for 10-60 min; (2) repeating step (1). The manganese-containing graphene composite material provided by this invention contains elements such as manganese, potassium, and sulfur. By refluxing under intermittent ultrasonic stirring, this invention enables the manganese-containing graphene composite material to have a large specific surface area, exhibiting excellent performance in reactions such as the removal of sulfur-containing compounds. On the other hand, the content of manganese ions and other substances in the wastewater is significantly reduced during the preparation process, effectively solving the problem of wastewater discharge pollution.

The application discloses a method for preparing submicron and micron alkylated graphene oxide by using coal, and comprises the following steps: 1, graphitizing coal powder to rearrange carbon atoms and grow submicron crystal regions; 2, oxidizing and peeling the graphitized coal under the action of sulfuric acid, phosphoric acid and potassium permanganate; 3, adding hydrogen peroxide to react with potassium permanganate and high-valence manganese salt in the solution until the solution turns yellow; 4, screening the solution to remove unreacted black impurities; 5, centrifuging the solution to reserve the precipitate, and then washing and centrifuging the precipitate with dilute hydrochloric acid and ethanol; 6, dispersing the precipitate with diethyl ether, and then obtaining graphene oxide powder through suction filtration. The prepared graphene oxide has an average size of 800 nm, an average layer number of 1-2 layers, and a yield of 107%. The method has simple steps, low cost and high yield, and is easy to realize industrial production, and has a very broad prospect in the present situation of urgently realizing high-value utilization of coal.

The application discloses an anti-wear and friction-reducing agent for a humanoid robot lubricating grease and a preparation method thereof, and particularly relates to the technical field of lubricant materials, and the anti-wear and friction-reducing agent is a composite material formed by in-situ growth of amorphous manganese oxide two-dimensional sheets on the surface of carbon nanotubes; the XRD pattern of the amorphous manganese oxide presents characteristic diffraction peaks of the carbon nanotubes and amorphous packages, and does not present characteristic diffraction peaks of crystalline manganese oxide; the selected area electron diffraction presents a diffuse halo ring, and is chemically bonded with the carbon nanotubes through Mn-O-C. The preparation method comprises the following steps: dispersing the carbon nanotubes in deionized water, adding a potassium permanganate solution, stirring and reacting at room temperature for 2-5 min, not adding an additional reducing agent, only using the carbon nanotubes as a reducing agent, and then performing centrifugation, washing and drying. The anti-wear and friction-reducing agent has excellent shear stability, significantly improves the anti-wear and friction-reducing performance of the lubricating grease, and has the advantages of simple process, rapidness, low cost and suitability for applications such as humanoid robot joints.

The application provides a hydrogen bond driven high signal-to-noise ratio dual-response signal ratio fluorescence self-assembly system and a potassium permanganate detection method thereof. The inherent local acid microenvironment of the system enhances the oxidation reaction activity of potassium permanganate. Based on the etching effect of potassium permanganate on the zinc-sulfur bond of quantum dots, the fluorescence of the quantum dots is quenched. The oxidation and hydrolysis effect of the acrylate bond in the probe 6-aldehyde-naphthyl acrylate brightens the fluorescence. The dual-response signal ratio fluorescence detection of potassium permanganate is realized by combining the torsional intramolecular charge transfer and the photoinduced electron transfer mechanism. With the increase of the concentration of potassium permanganate, the fluorescence emission peak of the system at 639 nm gradually decreases, the fluorescence emission peak at 521 nm gradually increases, and the fluorescence color changes from red to green. The response time is less than 1 second, and the solution state detection limit is as low as 4.80 nM. The solid-state sensing material prepared by loading the system on a polyacrylamide gel can realize the on-site visual detection of picogram-level potassium permanganate solid particles, and the detection limit is as low as 128 picograms. Moreover, the system has high specificity and high signal-to-noise ratio.

The invention provides a cobalt-free lithium-rich manganese-based positive electrode material and a preparation method thereof, an electrode plate and a lithium ion battery. According to the invention, oxidation rearrangement of transition metal ions in a strong oxidizing property induction layer of potassium permanganate is utilized to realize uniform dispersion and structural reconstruction of a superstructure unit in a Li2MnO3-like domain in a bulk phase, so that a lattice frame is effectively buffered and oxygen oxidation reduction reversibility is enhanced; meanwhile, a nanoscale spinel-like coating layer is generated on the surface of the material in situ through controlled secondary sintering, and the coating layer is highly compatible with a bulk phase structure, so that the interface side reaction is inhibited, and the cycle stability of the material is improved.

The invention belongs to the technical field of chemicals, and discloses a synthesis method of dithioerythritol, which comprises the following steps: S1, mixing cis-1, 4-dichloro-2-butene, acetone and water, cooling to below zero, adding potassium permanganate, keeping the temperature to react for a certain time after the potassium permanganate is added, filtering and collecting filtrate, then extracting, collecting extract liquor, evaporating, cooling and crystallizing to obtain dithioerythritol; filtering and collecting solids, and drying to obtain 1, 4-dichloro-2, 3-butanediol; and S2, mixing 1, 4-dichloro-2, 3-butanediol, sodium hydrosulfide and methanol, carrying out a reflux reaction, filtering, evaporating methanol, adding dichloromethane, adding magnesium sulfate, dehydrating, freezing, crystallizing, filtering, collecting a solid, and drying to obtain the dithioerythritol. The method has the beneficial effects that substances such as cis-1, 4-dichloro-2-butene, sodium hydrosulfide and potassium permanganate are adopted as raw materials, the price is low, the raw materials are easy to obtain, the process is simple, the yield is high, and compared with an existing method, the scheme has the advantages that the raw material cost is greatly reduced, the product yield is increased, and the method is suitable for enterprise production.

The present invention provides a water-soluble demulsifier and a preparation method thereof, which belongs to the field of oilfield chemical technology, comprising the following steps: step S1, under ice bath conditions, dissolving PEO-PPO in a dilute sulfuric acid solution, adding a potassium permanganate solution, heating and stirring to obtain carboxylated PEO-PPO; step S2, dissolving the carboxylated PEO-PPO in N,N-dimethylformamide, adding EDC and NHS, stirring the reaction, and obtaining an activated NHS ester solution; step S3, dissolving isoleucine in PBS buffer, slowly adding the activated NHS ester solution, stirring at room temperature, controlling the pH, and purifying to obtain isoleucine-grafted PEO-PPO, i.e., a water-soluble demulsifier. The present invention can achieve the purpose of efficient demulsification of the demulsifier.

The invention belongs to the technical field of magnesium-aluminum magnesium alloy surface treatment, and particularly relates to a magnesium-aluminum alloy surface yellow ceramic film layer and a color control method thereof, and the method comprises the following steps: immersing a pretreated magnesium alloy into an electrolyte containing a coloring agent, and carrying out micro-arc oxidation to generate different yellow ceramic film layers on the surface of the magnesium-aluminum magnesium alloy; the coloring agent is one or two of potassium dichromate, potassium permanganate and anhydrous cupric sulfate; by adopting the method disclosed by the invention, uniform, smooth and compact ceramic film layers with different yellow colors can be generated on the surface of the magnesium-aluminum alloy. Six ceramic film layers with different yellow colors are prepared, the cost is low, the protection function and the decoration function can be achieved, and the requirements of different application scenes are met.

The utility model discloses a zinc sulfate solution detinning device which comprises a wet precipitation tank, a solution adding opening is formed in the top of the wet precipitation tank, a liquid inlet pipe is arranged on one side of the solution adding opening, a metering barrel is installed on one side of the liquid inlet pipe, a connecting pipe is connected between the metering barrel and the upper end of the liquid inlet pipe, and the connecting pipe is connected with the lower end of the liquid inlet pipe. The lower end of the liquid inlet pipe is connected with an extension pipe, and a liquid storage pipe is installed below the metering barrel. A solution adding opening is formed in the upper portion of the wet precipitation tank, a flocculating agent is added into the wet precipitation tank through the solution adding opening, meanwhile, a liquid inlet pipe is arranged on one side of the solution adding opening, potassium permanganate is added into the wet precipitation tank through the liquid inlet pipe, and potassium permanganate and the flocculating agent are added. Potassium permanganate is used as a strong oxidant to help the valence state of tin in a zinc sulfate solution to change, and tin metal is hydrolyzed and precipitated into leaching residues by changing the valence state of tin, so that the tin content of liquid is controlled within a normal value range.

The invention discloses a dual-modified filler for deep denitrification of a micro-polluted water body and a preparation method and application thereof. The preparation method of the dual-modified filler comprises the following steps: S1, an oxidation / reduction protein grafting step: soaking a filler in an acidic potassium permanganate solution for oxidation treatment, and flushing the surface of the filler with an acidic solution; or soaking the filler in an L-cysteine solution for reduction treatment; washing the oxidized / reduced filler to be neutral, respectively soaking the filler in a glutaraldehyde solution and a protein solution, fully washing the filler with water after soaking is completed, and airing the filler for later use; s2, cation loading: soaking the filler subjected to the step S1 in an inorganic cation solution, then taking out the filler, and heating to dry the filler, so that inorganic cations are loaded on the surface of the filler. The filler is subjected to dual modification through oxidized / reduced protein grafting and cation loading, so that the biocompatibility and specific surface area of the filler are remarkably improved, the biofilm culturing time is shortened, and the denitrification effect is improved.

The invention belongs to the technical field of battery waste recovery, and particularly discloses a method for recovering valuable metals from a positive electrode material of a waste lithium ion battery. The method provided by the invention comprises the following steps: mixing the positive electrode material of the waste lithium battery with potassium permanganate, potassium hydroxide and water, carrying out a leaching reaction, carrying out solid-liquid separation after the reaction is completed, adding potassium carbonate into filtrate to carry out a precipitation reaction, carrying out solid-liquid separation to obtain filtrate and lithium carbonate precipitate, adjusting the pH value of the filtrate to 6.5-7.5, and carrying out solid-liquid separation to obtain a potassium manganate solution. According to the method, the valuable metals in the positive electrode material of the waste lithium battery can be selectively recycled under the normal-pressure mild condition, and the chemical reagent is recycled by utilizing the disproportionation reaction, so that the production cost is reduced.

The invention provides a biochar loaded iron and manganese oxide composite material, a preparation method and application thereof and a solid waste treatment method, and relates to the field of solid waste treatment. The preparation method of the biochar loaded iron and manganese oxide composite material comprises the following steps: performing first pyrolysis on a biomass raw material in an anoxic state to obtain biochar; mixing ferric salt and ferrite to prepare a mixed iron solution, and mixing potassium permanganate and sodium hydroxide to obtain a stable manganese oxidation precursor solution; dropwise adding the stable manganese oxidation precursor solution into the mixed iron solution, and carrying out a first reaction under an acidic condition to obtain an iron-manganese mixed solution; and mixing the iron-manganese mixed solution with the biochar, stirring under a neutral or alkaline condition, carrying out ultrasonic dispersion, standing and aging, carrying out solid-liquid separation, drying the solid, and carrying out secondary pyrolysis to obtain the biochar loaded iron-manganese oxide composite material. The biochar loaded iron and manganese oxide composite material provided by the invention can efficiently and synchronously stabilize Pb, As and Cd, and has excellent long-acting stability.

The invention discloses a carbon-coated sulfur-modified hollow tubular manganese dioxide catalyst and a preparation method and application thereof.The preparation method comprises the steps that hollow tubular manganese dioxide and a tris (hydroxymethyl) aminomethane solution are mixed, dopamine hydrochloride is added, polydopamine-coated hollow tubular manganese dioxide is prepared, the polydopamine-coated hollow tubular manganese dioxide and sublimed sulfur are mixed for pyrolysis, and the carbon-coated sulfur-modified hollow tubular manganese dioxide catalyst is obtained. The carbon-coated sulfur modified hollow tubular manganese dioxide catalyst is obtained. The prepared catalyst has the advantages of high catalytic activity, good stability, environmental friendliness and the like, is an environmental functional catalyst with excellent performance, can be used as a heterogeneous catalyst for efficiently activating potassium permanganate, can realize efficient degradation of organic pollutants (such as sulfamethazine) in a water body, and is good in reusability, low in use cost and suitable for industrial production. The method has high use value and good application prospect. The preparation method also has the advantages of simple process, environmental protection, low cost and the like, is suitable for large-scale preparation, and is beneficial to industrial application.

Provided is a polishing composition that can exhibit an excellent polishing removal rate and has a suitably suppressed combustion promoting property. A polishing composition disclosed herein comprises: sodium permanganate and potassium permanganate as an oxidizing agent; abrasive grains composed of a material having a Mohs hardness of 6 or more; and water. The ratio (CK / CS) of the concentration CK [mM] of the potassium permanganate to the concentration CS [mM] of the sodium permanganate is 0.33 or more. The content of the sodium permanganate is less than 22.5 wt%.