198results about "Manganese oxides/hydroxides" patented technology

The invention discloses a positive electrode material formed by compounding polyanionic sodium ferric sulfate and a layered transition metal oxide, and a preparation method and application thereof, and the preparation method comprises the following steps: preparing a sodium ferric sulfate positive electrode material, preparing a layered transition metal oxide positive electrode material, and mechanically mixing the sodium ferric sulfate and the layered transition metal oxide material, the composite material is obtained. The production process of the two materials is easy for large-scale production, has high similarity with the existing battery industrial equipment, is simple in method for compounding the two materials, and has large-scale industrial application value. The composite material has the stability of a polyanionic material and the high energy density of a layered oxide material, and has more excellent comprehensive electrochemical performance.

The invention provides a graphene-based hydrogen sulfide gas sensor and a preparation method thereof, and relates to the technical field of gas sensors. The preparation method of the graphene-based hydrogen sulfide gas sensor comprises the following steps: soaking the wood substrate in a mixed metal salt solution containing a water-soluble silver salt and a water-soluble transition metal salt; irradiating the soaked wood substrate by using a laser beam at room temperature under the condition of no shielding gas, so that lignin and cellulose in the wood substrate are cracked and reconstructed to form graphene; meanwhile, the mixed metal salt immersed in the wood substrate is decomposed to form bimetallic oxide nanoparticles including silver oxide nanoparticles and transition metal oxide nanoparticles, and the bimetallic oxide nanoparticles are dispersed on the surface of each layer of graphene to obtain a sensitive layer; and coating conductive materials on the wooden substrate and on the two sides of the sensitive layer to form a connecting electrode in contact with the sensitive layer, thereby obtaining the graphene-based hydrogen sulfide gas sensor.

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 application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

The invention provides a deep eutectic solvent and a method for recovering metal elements in a decommissioned lithium battery. The deep eutectic solvent is obtained by mixing a hydrogen bond donor and a hydrogen bond acceptor and reacting; the temperature in the reaction process is 70-100 DEG C, and the molar ratio of the hydrogen bond donor to the hydrogen bond acceptor is 1: (2-10); wherein. The hydrogen bond donor comprises at least one of imidazole, 1, 2, 4-triazole and 1-ethyl-3-methylimidazole, and the hydrogen bond receptor comprises at least one of propylene glycol, glycerol, n-butyl alcohol and triethylene glycol. The deep eutectic solvent has high safety, and when the deep eutectic solvent is used for recycling the positive electrode material of the decommissioned lithium battery, the leaching rate of the lithium element and the recycling rate of the cobalt element or the manganese element can be effectively increased, and the deep eutectic solvent has high recycling purity.

The present invention discloses a potassium-sodium co-doped manganese dioxide nanomaterial and its preparation and application. The present invention comprises the steps of dissolving silicate and manganese salt and mixing them to prepare a precursor; and treating the precursor by alkali etching. The potassium ions and sodium ions pre-embedded between the manganese dioxide layers stabilize the layered structure of the crystal, widen the interlayer spacing, and make the embedding and extraction of zinc ions and hydrogen ions smoother through electrostatic shielding. At the same time, the prepared potassium-sodium co-doped manganese dioxide nanomaterial has a unique nano-flower sheet structure, which increases the contact area of ​​the reaction. The electrochemical test results show that the potassium-sodium co-doped manganese dioxide nanomaterial has a good reversible specific capacity as a positive electrode material for zinc ion batteries. At a current density of 0.5 A / g, the high specific capacity can reach up to 239.1 mAh / g after 600 cycles.

This invention belongs to the field of biochemical detection and discloses a portable hepatitis biomarker detection kit. The kit contains a hydrogel; the hydrogel is obtained by dispersing hollow manganese dioxide in water to obtain an H-MnO2 dispersion, mixing the H-MnO2 dispersion with sodium alginate solution to obtain a mixed solution, and then adding a calcium salt solution to obtain the hydrogel. The hollow manganese dioxide is obtained by etching manganese Prussian blue analog nanoparticles with sodium hydroxide. The manganese Prussian blue analog nanoparticles are prepared from potassium ferricyanide, polyvinylpyrrolidone, and manganese salts. This invention utilizes the color change of hollow manganese dioxide in relation to TMB to construct a method for detecting hepatitis biomarkers using a smartphone to capture signals. This kit reduces the detection cost of hepatitis biomarkers, does not require large instruments, and is highly portable and widely applicable, possessing great potential as a novel point-of-care testing device.

The invention relates to a preparation method of a porous cauliflower-shaped MnO (at) C aqueous zinc ion battery positive electrode material. According to the method, low-cost and environment-friendly tartrate is adopted as a coordination agent and is coordinated with Mn < 2 + > to obtain manganese tartrate serving as a precursor, NaCl is adopted as a template and a reaction medium, the precursor and NaCl are fully mixed by a ball milling technology, and by regulating and controlling the calcination temperature, the manganese tartrate is prepared. The porous cauliflower-shaped MnO (at) C aqueous zinc ion battery positive electrode material assembled by the carbon-coated MnO nanoparticles is obtained. The preparation method successfully solves the problems that a coordination agent is toxic and harmful, MnO agglomerates at high temperature and carbon distribution is uneven, the maximum capacity of the obtained composite material is 561 mAh g <-1 > under the current density of 0.2 A g <-1 >, and the capacity still reaches 507 mAh g <-1 > after 100 cycles.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

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.

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include reacting a feed material comprising at least two metals selected from the group consisting of iron, magnesium, and calcium with a weak acid to produce a first leachate comprising ions of the at least two metals and an insoluble product; reacting the first leachate with a base to produce a first solid product comprising a first metal and a second leachate comprising ions of a second metal different from the first metal; and reacting the second leachate with the base to produce a second solid product comprising the second metal and a third leachate.

A method for preparing a two-dimensional porous oxide belongs to the technical field of porous oxide preparation. The method includes the following steps: (1) using a metal salt as a precursor, an ion-intercalated two-dimensional oxide is prepared by a molten salt method; (2) the ion-intercalated two-dimensional oxide is mixed with a lithium initiator, reacted for a predetermined time, and then the unreacted lithium initiator is removed, filtered, and washed to obtain the two-dimensional porous oxide. The two-dimensional porous oxide prepared by this method forms uniform pores with a pore size range of 2-10 nm and a specific surface area of ​​200-300 m². 2 / g.

The invention relates to a process for the preparation of overlithiated transition metal oxides, for example Li2NiO2, from a mixture consisting of lithium peroxide and at least one transition metal oxide or a manganese-containing spinel compound in a two-stage calcination process with respect to temperature and atmospheric composition.

The application discloses a kind of potassium-doped chain-like trimanganese tetroxide positive electrode materials and its preparation method and application, belong to the field of aqueous zinc-ion battery, preparation method includes: configuration isopropanol and deionized water mixed solution with a portion of.In magnetic stirring, manganese acetate, potassium chloride and nitrilotriacetic acid are dissolved into mixed solution, K-Mn-NTA, i.e.K-Mn-NCs precursor is prepared by hydrothermal method;Afterwards, K-Mn3O4-NCs is prepared by annealing method;Finally, polyaniline is in-situ polymerized on K-Mn3O4-NCs to obtain K-Mn3O4-NCs@PANI;The positive electrode material of the application is applied to zinc-ion battery, can improve the cycle performance and rate capability of zinc-ion battery, improve the conductivity of positive electrode material while inhibiting the dissolution of Mn, improve the electrochemical performance of zinc-ion battery.

A system for the synthesis of zinc oxide, iron oxide and manganese oxide nanoparticles by means of green synthesis using pea shell biomass extract as a reducing agent, wherein the nanoparticles have sizes in the range of 40-120 nm, which were confirmed by UV-Vis absorption, FTIR and FESEM.

The invention provides a regeneration method and application of a nickel-cobalt-manganese ternary material precursor based on raw material recycling. The regeneration method comprises the following steps: crushing a nickel cobalt lithium manganate positive plate disassembled from a waste battery, and screening to obtain positive powder; calcining the positive electrode powder in a hydrogen atmosphere, and dissolving a calcined solid product in water to obtain a leachate and a solid mixture; mixing the solid mixture with dilute sulphuric acid, and reacting at a certain temperature to obtain leachate and hydrogen; adding ammonia water into the leachate to obtain a chelate, adjusting the pH value through sodium hydroxide to precipitate the chelate, and performing solid-liquid separation to obtain a precursor and a waste liquid; distilling the waste liquid to collect ammonia gas and water vapor; and (5) electrolyzing the residual liquid in the distillation in the step (5), collecting sodium hydroxide in a cathode chamber after electrolysis, and collecting dilute sulfuric acid in an anode chamber. The regeneration method not only has a high regeneration rate, but also can ensure the cyclic utilization of the raw materials, so that no medicine waste or waste water tail treatment process exists.

The present invention belongs to the field of antibacterial materials, and in particular relates to a piezoelectric photocatalytic antibacterial material and its preparation method and application. The method comprises: x Zn 1‑x A manganese source and a zinc source are separately mixed with an alkaline sodium compound solution and bentonite, and then subjected to low-speed ball milling and autothermal ball milling, respectively, to obtain the piezoelectric photocatalytic antibacterial material; wherein: 0<x<1. The piezoelectric photocatalytic antibacterial material prepared by the present invention has strong piezoelectricity and, while having high adsorption capacity, its positive charge interferes with bacterial activity, thereby achieving effective antibacterial and odor-removing effects. The preparation process is characterized by simple operation, low energy consumption, economical practicality, and a short production cycle.

An electrochemical device includes a positive electrode plate. The positive electrode plate includes a positive active material layer. The positive active material layer includes a positive active material. After the electrochemical device is discharged, a molar fraction of an M1 element in the positive active material included in the positive electrode plate in a fully discharged state is a. The M1 element includes Ni, Co, and Mn. A molar fraction of Ni in the positive active material is b. A molar fraction of Mn in the positive active material is c. A molar fraction of an M2 element in the positive active material is d. The M2 element includes at least one of Na, K, or Mg. The value of b / a is 0.4 to 0.6, the value of c / a is 0.4 to 0.6, and the value of d / a is 0.04 to 0.06.

The application discloses a method for preparing spherical battery-grade Mn3O4, and the Mn3O4 is directly obtained through a one-step method. According to the growth characteristics of the Mn3O4 crystal particles, the on-line changes of the parameters of different growth stages of the Mn3O4 crystal are controlled and changed, and then the growth process of the Mn3O4 crystal is regulated, so that the particle size of the product is controlled and the shape of the product is optimized. Finally, the Mn3O4 product with uniform and controllable particle size and good morphology characteristics is obtained. In addition, according to the particle size of the target product, a corresponding scheme can be formulated to obtain the product meeting the requirements, and the fine control of the preparation process of the Mn3O4 is realized. The method has the advantages of short process, simple operation and low energy consumption.

Provided is a method for producing a lithium adsorbent precursor after roasting, the precursor comprising a large amount of tetravalent manganese with low solubility in water.　The method for producing a lithium adsorbent precursor after roasting includes an oxidative roasting step for subjecting a powdery lithium adsorbent precursor containing manganese to oxidative roasting at a temperature of 300 °C to 600 °C to obtain a powdery lithium adsorbent precursor after roasting. By subjecting the powdery lithium adsorbent precursor containing manganese to oxidative roasting at a predetermined temperature, divalent manganese can be converted into tetravalent manganese. Since tetravalent manganese has low solubility in water, it is possible to suppress the lithium adsorbent from dissolving in water at the time of use of the lithium adsorbent.

Provided is a producing method of granulated body for lithium adsorption that allows sufficiently suppressing a manganese elution in an eluting step when producing lithium on a commercial basis. A producing method of granulated body for lithium adsorption includes a kneading step of kneading a powder of a lithium adsorbent precursor and a binder to obtain a kneaded product, a granulating step of granulating the kneaded product to obtain a 1st granulated body, and a sintering step of sintering the 1st granulated body to obtain a 2nd granulated body. The configuration allows a manganese valence contained in the lithium adsorbent precursor to change from 2 to 4, and thus allowing the suppressed manganese elution in the eluting step. Further, in production on a commercial basis, the lithium adsorbent can be used repeatedly. In addition, a manganese concentration in an eluent obtained in the eluting step can be suppressed, thus allowing loads in steps after the eluting step to be reduced.

The invention provides a method for recycling metal from a waste ternary lithium battery positive electrode material. The method comprises the following steps: mixing the waste ternary lithium battery positive electrode material, a binder, a conductive agent and an organic solvent to prepare mixed slurry; coating a current collector with the mixed slurry to obtain an electrode plate; taking the electrode plate as an anode, taking an inert electrode as a cathode, dividing the electrolytic tank into an anode chamber and a cathode chamber by adopting a lithium ion selective permeable membrane, and carrying out oxidation-reduction reaction, so that transition metal ions are dissolved out from electrolyte of the anode chamber, and lithium phosphate precipitates are formed in the cathode chamber; and carrying out post-treatment on the electrolyte in the anode chamber to obtain the nickel-cobalt mixed metal salt. According to the method, the problems of low lithium purity, incomplete transition metal separation, complex process and the like in the traditional recovery technology are solved, and an efficient, environment-friendly and controllable process path is provided for high-valued recovery of valuable metals of the waste ternary lithium batteries.

The invention relates to a method for treating a residue obtained from the chloride process, wherein the residue comprises the components titanium dioxide, coke, an inert metal oxide, and an iron-containing component. Further, the invention refers to the use of this method to separate the components contained in said residue, and to the use of the separated components in the chloride process for obtaining titanium dioxide.

To provide a method for recovering metallic zinc from solid metallurgical waste containing zinc and manganese.SOLUTION: A. contacting the solid metallurgical waste with an aqueous leaching solution comprising chloride ions and ammonium ions to produce one or more leachates comprising zinc ions and manganese ions and one or more insoluble solid residues; b. cementing the leachate by adding metallic zinc as a precipitating agent to remove one or more metals other than zinc and manganese present in ionic form in the leachate; B. producing a purified leachate; and c. subjecting the purified leachate to electrolysis in an electrolytic cell comprising one or more cathodes and one or more anodes to deposit metallic zinc on the cathodes and produce one or more effluent leachates. The method comprises, prior to the electrolysis, the step of precipitating manganese ions by oxidation with permanganate ions and subsequently separating the sediment containing MnO2.SELECTED DRAWING: Figure 1

The application relates to an activation method of a high-loading manganese dioxide electrode material, in particular to in-situ growth of a high-loading manganese dioxide electrode material with a loading of greater than or equal to 15 mg cm ‑2 on a flexible carbon cloth surface, taking the high-loading manganese dioxide electrode material as a working electrode, taking a metal Pt sheet as a counter electrode, adopting a two-electrode system, activating the high-loading manganese dioxide in a zinc nitrate solution through cyclic voltammetry scanning, and the activated high-loading manganese dioxide exhibits excellent electrochemical properties. The application adopts an electric activation method to improve the electrochemical activity of the high-loading manganese dioxide, has the advantages of simple process, convenient operation and the like, and the activated high-loading manganese dioxide electrode material can be used for electrochemical energy storage.

The present disclosure relates to a kind of nano-enzyme and its preparation, detection, test method and device and application, it relates to nano-enzyme technical field.The preparation method of the present disclosure includes: respectively obtaining Mn (NO3) 2 stirring solution and aminoethanol stirring solution, the Mn (NO3) 2 stirring solution and the aminoethanol stirring solution are mixed, to obtain mixed solution;Under inert atmosphere, according to the set rate and third set time, the mixed solution is stirred, to obtain stirring mixed solution;According to the fourth set time, the stirring mixed solution is aged, to obtain corresponding suspension;The suspension is filtered, washed and dried, to obtain Mn3O4 oxidase.The present disclosure embodiment can realize the preparation, detection, test and application of nano-enzyme.

A process for preparing metal oxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum. The process comprising:reacting a metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum with lithium hydroxide and optionally a chelating agent to obtain a solid comprising a metal hydroxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum, and a liquid comprising lithium sulfate, the metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum;separating the liquid and the solid from one another to obtain the metal hydroxide;submitting the liquid comprising lithium sulfate to an electromembrane process for converting the lithium sulfate into lithium hydroxide; andreusing at least a first portion of said lithium hydroxide obtained by the electromembrane process for reacting with the metal sulfate;reacting at least a second portion of said lithium hydroxide obtained by the electromembrane process with the obtained metal hydroxide to obtain a mixture of metal hydroxides; androasting said mixture of metal hydroxides to obtain the metal oxide.

The present invention discloses a magnetic manganese dioxide tunable electromagnetic wave absorption material and a preparation method thereof, and relates to the technical field of new material synthesis and preparation. KMnO4, a reducing agent and a potassium salt are weighed in sequence and added to a beaker filled with deionized water, and stirred thoroughly until mixed; a carbon material is weighed and added, and stirred thoroughly to mix evenly; manganese oxide nanowires are grown in situ using microwave-assisted hydrothermal method, and after the reaction is completed, washing and filtering are performed, and a composite material precursor is obtained by drying; the material is flash-heated and oxidized using a microwave tube furnace, and the material whose surface is not completely converted into manganese oxide is deeply oxidized to obtain a cage-shaped manganese dioxide nanowire / multilayer expanded graphite carbon-based composite material. By microwave hydrothermal irradiation oxidation method, the expanded graphite is morphologically modified during the preparation process to simultaneously tune the phase of magnetic manganese dioxide, so as to realize in-situ synthesis of magnetic manganese dioxide nanowires and efficient electromagnetic wave absorption and shielding, and the preparation process is simple and efficient.

The present invention discloses a method for controlling the exposed crystal faces of manganese dioxide using a phase transformation strategy. This method involves reacting manganese dioxide with a phase transformation agent, urea, to transform the manganese dioxide into a manganese dioxide with highly exposed crystal faces. By selecting different manganese dioxide single crystal nanowires as precursors and calcining them with the phase transformation agent, urea, under an inert atmosphere, the manganese dioxide can be transformed into manganese dioxide with different exposed crystal faces, such as {101}, {112}, and {103}. The manganese dioxide with highly exposed crystal faces prepared by the present invention can be used as a catalyst to decompose organic gaseous pollutants in the air, with the manganese dioxide with {103} exposed faces exhibiting the best catalytic decomposition performance.

The invention discloses a method for removing trimethylamine through catalysis of a manganous-manganic oxide catalyst, and belongs to the technical field of atmospheric pollution control in environmental chemical engineering. The preparation method comprises the following steps: dissolving manganese acetate tetrahydrate in a mixed solution of ethylene glycol and water, heating, then adding a Na2CO3 solution in a nitrogen atmosphere, stirring for reaction, and then washing, drying and calcining to obtain a spherical manganous-manganic oxide catalyst; and finally, in a nitrogen atmosphere containing trimethylamine and oxygen, realizing catalytic removal of the trimethylamine by the spherical manganous-manganic oxide catalyst at 50-250 DEG C. By controlling the morphology of the manganous-manganic oxide catalyst, the obtained spherical manganous-manganic oxide catalyst can completely catalyze and decompose trimethylamine at a relatively low temperature (175 DEG C), and the spherical manganous-manganic oxide catalyst does not have an obvious inactivation phenomenon when the degradation reaction of the spherical manganous-manganic oxide catalyst on the trimethylamine is performed for 45 hours. When the trimethylamine is catalytically removed by the manganous-manganic oxide catalyst, the spherical manganous-manganic oxide catalyst has excellent nitrogen and carbon dioxide selectivity.