94 results about "Potassium bicarbonate" patented technology

The invention relates to the technical field of explosion suppression, in particular to a composite powder explosion suppressant and a design method and a preparation method thereof. The composite powder explosion suppressant is prepared from the following components in parts by mass: 20 to 25 parts of aluminum oxide, 10 to 20 parts of magnesium oxide, 20 to 30 parts of silicon dioxide, 1 to 3 parts of cerium oxide, 10 to 15 parts of potassium bicarbonate, 10 to 15 parts of sodium bicarbonate, 3 to 8 parts of gas-phase hydrophobic white carbon black and 2 to 6 parts of talcum powder. The composite powder explosion suppressant disclosed by the invention is high in explosion suppression efficiency; the metal oxide component screened through quantum chemistry calculation has good explosion suppression performance, and all the components in the composite powder explosion suppressant have a synergistic effect, so that hydrogen explosion can be effectively inhibited.

The invention relates to a composite powder explosion suppressant for suppressing aluminum hydride explosion and a preparation method of the composite powder explosion suppressant, belongs to the technical field of explosion suppressants, and solves the problems of single action mechanism, high required explosion suppression concentration, low efficiency and the like of a traditional explosion suppressant. According to the solution, the composite powder explosion suppressant for suppressing aluminum hydride explosion is prepared through raw material pretreatment, powder mixing and drying in sequence, and the composite powder explosion suppressant is prepared from the following components in parts by mass: 10.2 to 30.2 parts of melamine cyanurate, 20.4 to 40.6 parts of monopotassium phosphate, 15.2 to 25.2 parts of potassium bicarbonate, 8.4 to 13.2 parts of aluminum hydroxide, 6.8 to 11.1 parts of zinc borate, 5.0 to 9.0 parts of fumed silica and 2.0 to 5.3 parts of calcium silicate. The explosion suppressant can act on different combustion areas and combustion stages in the aluminum hydride explosion process, the physical and chemical explosion suppression effects of all the components of the explosion suppressant are fully exerted, and meanwhile, efficient explosion suppression of aluminum hydride explosion can be achieved through the synergistic effect of all the components.

The invention relates to a preparation method and application of carbon nanosphere modified biomass monolithic composite porous carbon, and belongs to the field of energy and chemical industry, and the preparation method comprises the following steps: S1, cutting pine into pine chips, drying, and carbonizing at high temperature to obtain a carbonized product; s2, dipping the carbonized product in a hydrochloric acid solution, then washing the carbonized product to be neutral, dehydrating the carbonized product, and polishing the dehydrated carbonized product; s3, putting the composite porous carbon into a glucose solution, carrying out vacuum-assisted impregnation, transferring into a hydrothermal reaction kettle, carrying out hydrothermal carbonization, drying, and carrying out constant-temperature chemical conversion; and S4, placing the composite porous carbon in a potassium bicarbonate solution for vacuum impregnation, drying and dehydrating, placing in a tubular furnace for constant-temperature chemical conversion to obtain a converted and carbonized product, impregnating in hydrochloric acid, washing, and drying. The specific surface area of the integral composite porous carbon is effectively increased, the electrode / electrolyte interface contact characteristic is remarkably optimized, and the pore channel space utilization rate and the energy storage performance are synchronously improved.

The invention provides a membrane-method carbon capture and solidification method. The membrane-method carbon capture and solidification method comprises a multivalent separation electrodialysis system, a cationic resin column, a bipolar membrane electrodialysis system, a carbon dioxide membrane enrichment device, an absorption tower, a pregnant solution pump, a desorption tower and four-compartment replacement electrodialysis. Alkali produced by bipolar membrane electrodialysis is used as absorption liquid, and acid produced by bipolar membrane electrodialysis is used as desorption liquid. According to the invention, the use cost of the adsorbent and the desorption agent is reduced, the internal balance of the agent system is realized, and meanwhile, the preparation of high-purity potassium bicarbonate can be realized by combining with four-compartment replacement electrodialysis. The system can be used for capturing and purifying carbon dioxide in atmosphere or industrial production and refining a potassium bicarbonate product, and compared with traditional carbon capture, absorption liquid and desorption liquid in the system can achieve circulation in the system, and zero emission is achieved.

The utility model discloses a technology for immobilizing carbon dioxide by microorganisms, and particularly relates to a technology for treating and purifying carbon dioxide in hazardous waste incineration waste gas by utilizing a photobioreactor, and the concentration of finally discharged carbon dioxide is close to that of carbon dioxide in the atmosphere. The flue gas treatment amount of the process system is 100m < 3 > / h, and the main process flow of the treatment is as follows: flue gas passes through a condensing heat exchanger, a spray tower, a chemical regulating tank, a photobioreactor and discharge (gas) / recovery (biomass); wherein a spraying agent in the spraying tower is potassium carbonate which reacts with carbon dioxide in the flue gas to generate a potassium bicarbonate solution, and the potassium bicarbonate solution is collected into the chemical adjusting tank and finally flows into the photobioreactor to serve as a supplementary carbon source; algae liquid discharged by the photobioreactor is collected and then subjected to filter pressing treatment, filtrate is circulated to a spray tower water collecting tank and used for preparing spray liquid, and water circulation of the whole system is achieved.

The present disclosure includes a multi-fluid kit for three-dimensional printing. The multi-fluid kit can include a fusing agent comprising water and a radiation absorber that absorbs radiation energy and converts the radiation energy to heat, an acidic agent having a pH from about pH 1 to about pH 6.9 that includes water and an acidic component, and a pore-promoting agent including water and a pore-promoting compound. The pore-promoting compound can chemically react with the acidic component to generate a gas, and can be selected from sodium bicarbonate, potassium bicarbonate, or a combination thereof.

The invention provides a preparation method and application of biomass derived carbon / konjac glucomannan composite flexible aerogel, and relates to the technical field of aerogel. The preparation method comprises the following steps: co-activating potassium bicarbonate and melamine, and pyrolyzing biomass at high temperature to prepare rice husk biochar, dispersing the biochar in an aqueous solution, adding KGM to form composite sol, filling a mold with the composite sol, putting the mold into a refrigerator, pre-freezing overnight, and carrying out vacuum freeze drying to form the biomass derived carbon / konjac glucomannan composite flexible aerogel. The composite flexible aerogel has a high specific surface area and a rich microporous structure, provides a large number of adsorption sites for VOCs molecules, significantly improves the adsorption capacity of the composite flexible aerogel to VOCs, has good compression resilience and excellent flexibility, is slightly influenced by environmental factors in the adsorption process, and has good application prospects. The three-dimensional porous structure is stable, collapse is not prone to occurring, high adsorption performance can still be kept after repeated use, the service life is long, and recycling is convenient.

The application discloses a method and system for recycling dust removal ash of blast furnace manganese iron smelting, and first proposes a technical route for recycling carbon powder, fluorite, manganese fluoride, manganese sulfate, potassium bicarbonate, potassium sulfate, sodium chloride and other valuable resources by water washing of the dust removal ash of blast furnace manganese iron smelting. The water washing slag and washing wastewater of the dust removal ash of blast furnace manganese iron smelting are simultaneously treated in a cooperative manner, the process can be designed according to the characteristics of the washing wastewater and the water washing slag, the multistage recovery of the valuable resources is realized, new impurities are not introduced, and the added value of the recovered resources is improved. In addition, the whole process does not discharge wastewater and waste gas, has high economic value and meets the green and environment-friendly production requirements.

The invention discloses a preparation method of a carbon dioxide slow-release phase change cold storage agent for fruit and vegetable preservation, which comprises the following steps: 1) synthesizing poly (N-isopropylacrylamide) hydrogel, and soaking the poly (N-isopropylacrylamide) hydrogel in a mixed solution to obtain PNIPAM hydrogel loaded with citric acid; (2) synthesizing Sponge hydrogel, and soaking the Sponge hydrogel in a potassium bicarbonate solution to obtain Sponge hydrogel loaded with potassium bicarbonate; and (3) the Sponge hydrogel and the PNIPAM hydrogel are assembled, and the carbon dioxide slow-release phase change cold storage agent is obtained. The two hydrogels are assembled, so that the PNIPAM gel network shrinks when the temperature rises to be higher than LCST in the transportation process, the loaded citric acid solution is diffused into Sponge gel and reacts with KHCO3 to generate CO2, and after the temperature falls back, the reaction is slowed down or stopped, so that the controlled release of CO2 is realized.

The invention provides a preparation method of a copper nano-catalyst, a three-electrode system is adopted and placed in an electroplating solution for electrochemical deposition to prepare the copper nano-catalyst, and the electroplating solution contains bivalent copper salt, potassium bicarbonate, potassium sodium tartrate and villiaumite. The preparation method of the copper nano-catalyst is simple, the preparation period is short, and the selectivity of reducing CO2 to produce ethanol is high.

This invention relates to a novel honeycomb activated carbon for adsorption-desorption catalytic combustion processes, belonging to the field of activated carbon technology. The novel honeycomb activated carbon comprises the following raw materials: a composite matrix, a composite activator, cobalt nitrate hexahydrate, zirconium oxynitrate hydrate, platinum nitrate, polyvinylpyrrolidone, and hexadecylamine. This invention uses beet pulp, enoki mushroom residue, and king oyster mushroom residue as the composite matrix to provide a large number of hydroxyl groups. Potassium bicarbonate and triammonium phosphate are used as the composite activator to dehydrate, condense, and interconnect the numerous hydroxyl groups on the composite matrix, effectively increasing the pore structure of the system and providing a large number of adsorption sites, facilitating the adsorption and mass transfer of VOCs. Simultaneously, the introduction of cobalt, zirconium, and platinum metal elements significantly improves the catalytic combustion performance of the system for VOCs. The addition of polyvinylpyrrolidone and hexadecylamine further enhances the catalytic combustion performance of the system.

The application designs a method for preparing optically active methyl fluoropropionate by using diethylamine sulfur trifluoride, comprising the following steps: fluorination reaction: under the protection of nitrogen, methyl S-lactate is added to a dry reaction kettle as raw material, the kettle temperature is cooled to a first reaction temperature, diethylamine sulfur trifluoride is added dropwise into the reaction kettle, after dropping, the reaction kettle is heated to a second reaction temperature, after the reaction is completed, the reaction mixture is added dropwise into saturated sodium / potassium bicarbonate aqueous solution to obtain R-2-fluoropropionic acid methyl ester; the molar ratio of diethylamine sulfur trifluoride to methyl S-lactate is 1-1.5:1, the method is high in efficiency, low in three-waste amount, short in reaction path, suitable for industrial production, and has economic value.

The invention belongs to the field of inorganic chemical industry, and particularly relates to a potassium carbonate production technology, in particular to a method for purifying a copper ion-containing pesticide synthesis byproduct potassium chloride and directly using the copper ion-containing pesticide synthesis byproduct potassium chloride to produce potassium carbonate. The method comprises the following steps: purifying a byproduct potassium chloride to obtain a refined byproduct potassium chloride solution V; conveying the refined byproduct potassium chloride solution V into a cation exchange resin bed, and carrying out ion exchange to respectively obtain a potassium bicarbonate solution and an ammonium chloride solution; the potassium bicarbonate solution and the ammonium chloride solution are subjected to evaporation, concentration, crystallization and centrifugal separation respectively, so that a potassium bicarbonate wet product and an ammonium chloride wet product are correspondingly obtained respectively; and calcining the potassium bicarbonate wet product at high temperature to obtain potassium carbonate. The method has the technical advantages of being low in energy consumption, free of waste water, free of newly-added pollutants and impurities and the like.

The present invention relates to pharmaceutical compositions comprising a therapeutically effective dose of a salt of lenvatinib and a potassium carbonate, in particular potassium bicarbonate, wherein the weight ratio of the salt of lenvatinib to the potassium carbonate is selected from the range of 1:0.3 to 1:3.0.

The present disclosure provides a method for extracting potassium bicarbonate from a mineral mixture. The method includes combining potassium chloride, sodium bicarbonate, and magnesium carbonate trihydrate in an aqueous solution. The aqueous solution is cooled to form Engel's salt comprising potassium bicarbonate magnesium carbonate tetrahydrate. Engel's salt is separated from the aqueous solution and leached with water to produce an aqueous potassium bicarbonate solution and magnesium carbonate trihydrate. The method may further include recycling at least a portion of the magnesium carbonate trihydrate produced from leaching Engel's salt back into the aqueous solution. The aqueous potassium bicarbonate solution can be processed to produce various potassium bicarbonate products.

The invention provides an efficient BC type superfine dry powder extinguishing agent. The efficient BC type superfine dry powder extinguishing agent comprises the following components: 87-92 parts by weight of a base material; 5-8 parts by weight of nano hydrophobic white carbon black; 3-5 parts by weight of modified zeolite; the base material comprises sodium bicarbonate and / or potassium bicarbonate; the modified zeolite is ZSM-5 type zeolite loaded with iron ions. Compared with the prior art, the efficient BC type superfine dry powder extinguishing agent provided by the invention adopts components with specific contents, and realizes relatively good overall interaction: zeolite and an acid solution are mixed, acidizing treatment is performed, and then iron ions are loaded through an ion exchange method, so that the efficient BC type superfine dry powder extinguishing agent is obtained. And finally, the mixture is mixed with bicarbonate and nano hydrophobic white carbon black, and the efficient BC superfine dry powder extinguishing agent is prepared. The ratio of effective fire extinguishing components of the fire extinguishing agent is 87% or above, and the fire extinguishing agent has excellent fire extinguishing performance and is particularly suitable for filling of superfine dry powder fire extinguishing equipment; according to the technical scheme, the efficiency and the application range of the fire extinguishing agent are remarkably improved.

This invention relates to compositions, particularly aqueous compositions, comprising: (a) guanidine and / or at least one unsubstituted guanidine salt, and (b) one or more carbonate compounds selected from sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, ammonium bicarbonate, and ammonium carbonate. The compositions are characterized in that the weight ratio of component (a) to component (b) is in the range of 1:14 to 54:1, and in each case, the weight ratio is determined based on the content of guanidine and carbonate ions in the entire composition. The invention further relates to industrial products comprising the compositions of the invention, and the use of the compositions for stabilizing aqueous industrial products against microbial invasion.

The utility model discloses a sodium-potassium separation system for a potassium-containing sodium carbonate solution. The sodium-potassium separation system comprises an MVR (mechanical vapor recompression) evaporator, a first centrifugal machine, a refrigerator, a second centrifugal machine, a carbonizer and a third centrifugal machine, the method has the advantages that the carbonic acid type sodium sylvite does not need to be transformed into strong acid type sodium sylvite, sodium salt can be separated out through evaporation and concentration, then potassium bicarbonate can be obtained through freezing and carbonization, the separated sodium carbonate and potassium bicarbonate do not need to be crystallized repeatedly, and the separation cost is higher; the obtained sodium carbonate and potassium bicarbonate reach the industrial grade, and have obvious economic value.

The invention discloses an expanding agent, an expanding adhesive, a heating removable protective film and a preparation method, and relates to the technical field of adhesives. The expanding agent provided by the invention comprises the following components in parts by weight: 18-22 parts of methyl acrylate; 22 to 27 parts of butyl acrylate; 53 to 56 parts of acrylonitrile; 0.5 to 1 part of an initiator; 1-3 parts of a dispersant; and 20-30 parts of potassium bicarbonate. In the formula, methyl acrylate and butyl acrylate are used as flexible monomers to endow a polymer chain with good ductility, and the rigid structure of acrylonitrile enhances the mechanical strength and thermal stability of the polymer. The three components are copolymerized under the action of an initiator to form an acrylic polymer shell which uniformly coats potassium bicarbonate particles, so that high dispersity and interfacial compatibility of the expanding agent in the adhesive are ensured, and performance degradation or appearance defects caused by traditional turbid liquid are avoided. Through scientific proportioning and synergistic effect, the compatibility and thermal response performance of an adhesive system are remarkably optimized, and the performance of an expansion adhesive and a heating removable protective film is improved.

A method to produce alkali formate includes introducing a catholyte solution to an electrochemical reaction chamber having a cathode, the catholyte solution comprising a mixture of alkali formate and alkali bicarbonate, introducing carbon dioxide into the electrochemical reaction chamber with a cathode, and applying electricity to the membrane to cause formation and output of alkali formate. A method to produce potassium formate, comprising introducing a catholyte solution to electrochemical reaction chamber, the catholyte solution comprising a mixture of potassium formate and potassium bicarbonate, introducing carbon dioxide into the electrochemical reaction chamber, and applying electricity to the membrane to cause formation and output of potassium formate.

The invention discloses a method for producing hydrogen peroxide by two-electron electrocatalytic water oxidation of calcium carbonate-based natural substances, which comprises the following steps: (1) preparation of an anode material: loading the calcium carbonate-based natural substances such as egg shell powder, calcite powder, clam shell powder, coral powder and the like on a substrate through a naphthol binder to serve as the anode material; and (2) carrying out a reaction for synthesizing hydrogen peroxide by electro-catalysis water oxidation: constructing an electro-catalysis environment and electrochemical double cells, separating a cathode and an anode by a nafion membrane only allowing protons to pass through, taking a graphite sheet as the cathode, and taking a mixed solution of potassium carbonate and potassium bicarbonate as an electrolyte. And carrying out electro-catalysis water oxidation reaction to obtain a high-concentration hydrogen peroxide solution. The method simultaneously meets the requirements of resource utilization of the calcium carbonate waste and production of high-concentration hydrogen peroxide, and has the advantages of environmental friendliness and certain economic value.

This invention discloses a method for preparing a GLP-1R receptor agonist and a method for preparing its intermediates. The method for preparing the GLP-1R receptor agonist and its intermediates comprises a method for preparing a compound of formula I-1, which includes the following steps: in the presence of an inorganic base, a compound of formula I-1-6 and a compound of formula I-1-7 are subjected to a substitution reaction in a solvent to obtain a compound of formula I-1; wherein the inorganic base includes one or more of potassium carbonate, potassium bicarbonate, sodium carbonate, and sodium bicarbonate. This method has the advantages of high yield and low cost in the preparation of GLP-1R receptor agonists and their intermediates, and shows good application prospects.

The present invention discloses a graphene quantum dot-supported CuO catalyst for electrocatalytic production of ethylene from high-current carbon dioxide, and its preparation method and application. In the present invention, two high-purity graphite carbon rods are inserted into a potassium bicarbonate solution, electrode clips are clamped, and electricity is passed to electrolytically strip the carbon material on the surface of the graphite rods to obtain graphene quantum dots. The supernatant is taken by centrifugal filtration, filled into a dialysis bag and dialyzed to remove potassium bicarbonate salt to obtain an aqueous solution of graphene quantum dots; the aqueous solution of graphene quantum dots is mixed with solid powder of CuO nanosheets, ethanol is added, stirred, the precipitate is taken by centrifugal filtration, and dried to obtain a graphene quantum dot-supported CuO catalyst. The graphene quantum dot-supported CuO catalyst prepared by the present invention effectively solves the problem of too rapid evolution of the catalyst structure due to electroreduction during the reaction process, and has a high yield and is easy to produce on a large scale, and shows good activity and stability in the electrochemical conversion of carbon dioxide to ethylene.

According to the method, polyethyleneimine is used as a modifier, corncob is used as a biomass carbon source, potassium bicarbonate is used as an opening agent, water is used as a solvent, and the nitrogen-doped biomass charcoal material is obtained through calcination under inert gas and used for acetylene hydrochlorination reaction. The catalyst has high activity and chloroethylene selectivity in a reaction for preparing chloroethylene through acetylene hydrochlorination in a fixed bed, and has great industrial application value. Under the conditions that the reaction mass space velocity is 2.0 ml / g.min, V (C2H2) / V (HCl) is 1: 1.05 and the reaction temperature is 220 DEG C, the acetylene conversion rate can reach 84.7%, and the vinyl chloride selectivity is greater than 99%. Meanwhile, compared with the activity of a non-nitrogen-doped biomass charcoal material and the activity of nitrogen-doped commercial activated carbon, the activity of the nitrogen-doped biomass charcoal material is improved by 38.2% and 30%, and a novel preparation method of the nitrogen-doped biomass charcoal material is provided for acetylene hydrochlorination reaction.

The present application relates to the technical field of carbon material preparation, in particular to a coal-tar pitch-based heteroatom-doped porous carbon, a preparation method and application thereof, a three-dimensional network boron-nitrogen-phosphorus-doped porous carbon is prepared by taking coal-tar pitch as a precursor, boric acid as a boron source, melamine phosphate as a phosphorus-nitrogen source and potassium bicarbonate as an activating agent. By changing the types of raw materials, the pore structure and morphology of the porous carbon material can be regulated, and a unique three-dimensional porous network structure is constructed. The specific surface area of the obtained porous carbon material is between 522 and 1245 m 2 / g, the addition of boric acid and melamine phosphate realizes the doping of boron, nitrogen and phosphorus elements. The obtained porous carbon material has good rate performance and cycle performance as a zinc ion hybrid capacitor electrode material.

A shelf-stable, indulgent, soft-baked snack product (e.g., a soft-baked snack bar) having reduced saturated fat, sodium, and / or sugar levels (“reduced SFSS”) compared to prior art soft-baked snack products but that is indulgent and flavorful to the consumer. The snack product has a relatively high moisture content, preferably about 5 wt % to about 20 wt %. A dough composition for making reduced SFSS, shelf-stable, indulgent, soft-baked snack products includes a flour component, a fat component consisting of sunflower oil (e.g., high oleic sunflower oil), a plurality of crispy protein inclusions, and a sucrose-free sugar component including isolated fructose. Sodium-containing leaveners are partially or completely replaced, e.g., by potassium bicarbonate. If present, cocoa powder is used in reduced amounts compared to prior art soft-baked snack products. A method of making the reduced SFSS, shelf-stable, indulgent, soft-baked snack product with the crispy protein inclusions includes a step of baking the dough composition.

The invention provides a water-based fire extinguishing agent and a preparation method thereof, and belongs to the technical field of fire extinguishing agents. The water-based fire extinguishing agent comprises a component A and a component B, the component A comprises potassium bicarbonate, potassium carbonate, potassium chloride and sodium acetate, and the component B comprises glycerin and water; the water-based fire extinguishing agent disclosed by the invention is clean in components, safe and pollution-free, can exert a remarkable fire extinguishing effect on general fire disasters, oil fire disasters, edible oil fire disasters and other fire disasters occurring in a home environment, and has very good practicability.

The application provides a self-igniting fire extinguishing agent and application thereof, and has the characteristics that the self-igniting fire extinguishing agent comprises the following raw material components in parts by weight: 50-60 parts of potassium nitrate, 5-10 parts of strontium nitrate, 5-10 parts of 5-amino tetrazole, 5-10 parts of azodicarbonamide, 5-10 parts of dicyandiamide, 5-10 parts of melamine, 5-10 parts of phenolic resin, 5-10 parts of shellac resin, 5-10 parts of potassium bicarbonate, 1-5 parts of nitrocellulose and 1-10 parts of vermiculite powder. The self-igniting fire extinguishing agent is applied to fire extinguishing products such as fire extinguishing ropes and fire extinguishing sheets, and has the characteristics of large fire extinguishing range, fast ignition, low-temperature ignition (about 180 DEG C), complete reaction, low turbidity of fire extinguishing gas, low cost, passive temperature-sensing multiple fire extinguishing and the like.

The invention provides a potassium-based carbon capture adsorbent, a preparation method and application, the preparation method comprises the following steps: mixing potassium bicarbonate as a potassium source precursor with deionized water to prepare an impregnation liquid, adding a carrier into the impregnation liquid according to a preset loading capacity, and stirring to obtain a carrier mixture; placing the carrier mixture in a drying oven for heating and drying; extruding, rolling and granulating the dried carrier mixture to obtain adsorbent precursor particles with uniform particle size; the adsorbent precursor particles are subjected to high-temperature calcination, so that potassium bicarbonate is decomposed and converted into potassium carbonate, and the potassium-based carbon capture adsorbent is formed. Potassium bicarbonate is adopted as a potassium source precursor, so that the technical problems of poor forming effect and low mechanical strength caused by deliquescence of potassium carbonate are fundamentally solved, and meanwhile, high mechanical strength and excellent CO2 adsorption performance are achieved.

The invention discloses a method for promoting the performance of producing hydrogen peroxide (H2O2) by electrocatalytic water oxidation reaction through interface regulation and control, which comprises the following steps: (1) carrying out interface modification on a two-dimensional material MXene (V2CTx, Ti3C2Tx, Nb2CTx and Mo2CTx) with negative charges on the surface, loading a cationic polymer poly (diallyldimethylammonium chloride) (PDDA) on the surface through long-time magnetic stirring, and carrying out magnetic stirring on the surface of the two-dimensional material MXene (V2CTx, Ti3C2Tx, Nb2CTx and Mo2CTx) for a long time; regulating and controlling the types of charges on the surface to obtain the MXene / PDDA modified material with positive charges on the surface; and (2) loading the modified material on carbon paper as an anode, taking a graphite flake as a cathode, taking a mixed solution of potassium carbonate and potassium bicarbonate as an electrolyte, and carrying out electro-catalysis two-electron water oxidation reaction under the conditions of normal temperature, normal pressure and constant input voltage to obtain a high-concentration H2O2 product.