144 results about "Phosphate ion" patented technology

The invention relates to a preparation method of iron phosphate, and discloses low-sulfur porous iron phosphate and a preparation method thereof. The preparation method of the low-sulfur porous iron phosphate comprises the following steps: providing a mixed solution which contains iron ions, phosphate ions and sulfuric acid; controlling the temperature of the mixed solution to be 60-80 DEG C, and preserving heat and aging for 10-20 hours to obtain slurry containing iron phosphate; extracting a solid from the slurry and washing for multiple times; the washed solid is subjected to microwave drying, the drying temperature is set to be 350-400 DEG C, and the frequency is set to be 2400-2500MHz. The preparation method is short in technological process and low in energy consumption, and the prepared iron phosphate is low in sulfur content, is of a porous structure, is applied to a battery, facilitates permeation of an electrolyte and intercalation and deintercalation of lithium ions, and can enable the battery to have high circularity.

The utility model relates to the technical field of organic wastewater treatment, and discloses a magnesium-carbon primary battery reaction tank which comprises a reaction tank, a water inlet pipe is arranged inside the left side of the reaction tank, a water outlet pipe is arranged inside the right side of the reaction tank, and a first slag discharge tank and a second slag discharge tank are arranged inside the upper side of the reaction tank. A negative plate magnesium plate and a positive plate carbon plate are arranged in the reaction tank, a sludge scraper is arranged in the reaction tank, and the bottom end of the water inlet pipe is fixedly connected with a sludge accumulation hopper. According to the utility model, magnesium ions react with ammonia nitrogen and phosphate in the wastewater to generate magnesium ammonium phosphate precipitates, so that multiple purposes are realized, the content of hydrogen ions in the wastewater is reduced, the acidity of the wastewater is relieved, the content of ammonia nitrogen and phosphate ions is directly reduced, and the production cost is reduced. The burden of nitrification, denitrification and biochemical phosphorus removal of a subsequent biochemical system is relieved, and meanwhile, the dosage of phosphorus removal in deep treatment is reduced.

The invention provides a method for preparing a MnCo2O4 catalyst from a phosphate radical modified precursor and application of the MnCo2O4 catalyst, uniform doping of phosphate radical ions in a MnCo2O4 crystal is realized through a synergistic effect of molecular modification and subsequent calcination of a phosphate radical functional group on a cobalt-manganese hydroxide precursor, so that the defects of surface modification are fundamentally overcome, and the application range of the MnCo2O4 catalyst is widened. The method has the advantages of simple preparation process, short reaction time, mild conditions, strong controllability and good repeatability, and is suitable for the fields of efficient water treatment and environmental restoration. Phosphate radical impregnation is carried out at the cobalt manganese hydroxide precursor stage, so that phosphate radicals enter an MnCo2O4 spinel bulk phase structure in the subsequent calcination process, stable bulk phase modification is realized, and the thermal stability and structural integrity of the material are remarkably improved; phosphate radicals have an adjusting effect on a metal cation coordination environment, valence optimization of Mn and Co can be induced in the calcination process, the proportion of Mn < 3 + > / Mn < 4 + > and balance of Co < 2 + > / Co < 3 + > are improved, and the material has more high-activity sites capable of participating in persulfate activation reaction.

The application discloses a PO4 3‑ and a preparation method of a flame-retardant epoxy acrylate coating layer of 8-OQ intercalated zinc-aluminum hydrotalcite, and the coating layer. Phosphate ions are intercalated between layers by using the ion-exchangeability between layers, and other intercalation agents are used to increase the intercalation rate of phosphate ions before the phosphate ions are embedded into the layers. 8-hydroxyquinoline as an intercalation agent can effectively expand the interlayer spacing of hydrotalcite, and provide more space for anion exchange. The Zn / Al-PO4 3‑ -LDHs intercalated with 8-hydroxyquinoline has the optimal flame-retardant and mechanical properties of the coating layer of the EA compound system. The hydrotalcite can make the carbon layer more uniform, more dense and more solid, and increase the carbon content of the coating layer, so as to improve the flame retardancy and thermal stability of the composite coating, and provide a new method for the research on the hydrotalcite modified EA fireproof coating.

The invention relates to a vertical flow biological induction dephosphorization system and a dephosphorization process. The system comprises a reactor body, an inner barrel and an outer barrel, wherein the inner barrel and the outer barrel form an inner reaction cavity and an outer reaction cavity; the flow guide device is communicated to the axial bottom end of the inner cylinder; the aeration device is arranged in the flow guide device and is used for aerating upwards; and the dephosphorization agent adding device is used for adding a dephosphorization agent while crushing particles below the flow guide device. By additionally arranging a dephosphorization agent adding device, large-particle-size anaerobic ammonia oxidation particles are crushed, a dephosphorization agent is added at the same time, an alkaline environment created by hydroxyl radicals generated by anaerobic ammonia oxidation reaction and microorganisms are used for synergistically promoting a dephosphorization path, a biological induced crystallization reaction is enhanced, and the dephosphorization effect is improved. According to the invention, calcium and magnesium ions are added into the phosphorus removal agent, the excessive calcium and magnesium ions and phosphate ions in the sewage are promoted to be subjected to a crystallization reaction, the free phosphate ions are converted into phosphorus-containing precipitates, the purposes of phosphorus removal and phosphorus resource recovery can be achieved, the dosage of alkaline agents in the phosphorus removal agent can be reduced, and considerable economic benefits are achieved.

The invention discloses a sustained and controlled release value-added fertilizer containing a bioactive carrier and a preparation method of the sustained and controlled release value-added fertilizer, and belongs to the technical field of sustained and controlled release fertilizers. The slow / controlled-release value-added fertilizer is prepared by compounding a bioactive carrier and an NPK compound fertilizer, wherein the bioactive carrier is prepared from three parts, namely a charcoal-layered double-metal hydroxide composite base material, interlayer intercalation phosphate radicals and surface-loaded humic acid. High-amount uniform loading of layered double hydroxides on the surface of biochar is achieved through a hydrothermal in-situ growth technology, phosphate radicals are stably embedded between layers in a subject-object composite mode, and a humic acid active component is combined to form a novel value-added fertilizer with multiple functions of nutrient slow release, soil improvement and growth stimulation. The fertilizer utilization rate is effectively improved, and the nutrient loss risk is reduced.

The application discloses a gold leaching method for pyrite-containing gold ore, and comprises the following steps: after the pyrite-containing gold ore is finely ground, water is added to obtain a slurry; a gold leaching reagent solution is added into the slurry to obtain a mixed leaching solution; the pH value of the mixed leaching solution is adjusted to alkaline, and leaching treatment is performed; and after filtration, a gold-containing leaching solution is obtained; the gold leaching reagent solution comprises polyphosphate, copper salt and thiosulfate; in the gold leaching reagent, polyphosphate is added; under alkaline conditions, polyphosphate ions can be selectively adsorbed or complexed on the surface active sites of pyrite to form a physical or chemical masking layer, thereby effectively blocking the direct contact of pyrite with dissolved oxygen and thiosulfate in the solution, inhibiting the catalytic decomposition of pyrite, significantly reducing the invalid consumption of thiosulfate, stabilizing the pH value and potential of the leaching system, and guaranteeing the efficient leaching of gold.

The invention provides a phosphorus-fixing lanthanum-based nano composite material as well as a preparation method and application thereof, and relates to the field of novel nano composite materials. According to the material, lysozyme protein fibers are taken as a structural template, a confinement space is constructed by utilizing the ultrahigh length-diameter ratio of the lysozyme protein fibers, and controllable synthesis of the sub-5nm high-dispersion lanthanum oxide nanoparticles is realized. Functional groups in a protein chain can be enriched and nucleation sites can be provided through electrostatic attraction and key coordination synergistic effect, so that the lanthanum-based protein fiber nano composite material is formed. When the material is used for treating phosphorus wastewater, efficient phosphorus removal and long-term phosphorus fixation are realized through an enrichment-conversion synergistic mechanism: phosphate ions are enriched through electrostatic adsorption, and thermodynamically stable lanthanum phosphate is generated in situ at lanthanum active sites. According to the method, gt is still kept in the presence of high-concentration equal competitive ions; the phosphorus removal rate is 90%, the generated lanthanum phosphate can be used as a slow-release phosphate fertilizer or an industrial phosphorus chemical raw material, and closed-loop conversion from pollution purification to resource utilization is realized.

The disclosure relates to a continuous process for obtaining phosphoric acid and calcium sulphate dihydrate from apatite, and sulphuric acid using hydrochloric acid as an intermediate attacking agent, comprising the steps: Leaching (101) apatite (11) with an aqueous solution of hydrochloric acid (12,13) to solubilize phosphorus compounds contained in the apatite, thereby obtaining a solution (15) containing phosphate (H3PO4) and calcium chloride (CaCl2); extracting (103) said solution (15) with organic solvent (16), yielding an organic extract (17) loaded with phosphate ions, and an aqueous raffinate (21) containing calcium chloride and residual impurities; re-extracting the phosphate ions from the organic extract (17) with water (18), thus yielding an aqueous extract (19) of phosphoric acid, and an unloaded organic phase substantially free of phosphoric acid, reacting (107) the raffinate (21) containing calcium chloride with sulphuric acid (26) to cause precipitation of calcium ions in the raffinate as calcium sulphate dihydrate and to recover chloride ions in the raffinate in the form of hydrochloric acid (12), wherein the reaction of the raffinate (21) containing calcium chloride with sulphuric acid (26) involves intermittent agitation of the raffinate, filtering off (108) precipitated calcium sulphate dihydrate (27) from the previous step (107) and washing it with water, recycling (112) the recovered hydrochloric acid (12) to the step (101) of the leaching apatite.

The application discloses an aluminum phosphate powder material with radiation refrigeration performance and a preparation method thereof. The method comprises the following steps: step 1, according to the molar ratio of aluminum ions, phosphate ions and ethylene glycol 2:(1-4):(10-20), aluminum hydroxide, ammonium phosphate and ethylene glycol are weighed, the aluminum hydroxide and the ammonium phosphate are mixed and then put into a mortar, the ethylene glycol is added into the mortar, and after being fully ground, the mixture A is obtained through filtration and washing; step 2, the mixture A is put into a crucible and placed in a muffle furnace, the temperature is first raised from room temperature to 200-280 DEG C at a temperature rising rate of 3-5 DEG C / min, and then raised to 1000-1200 DEG C at a temperature rising rate of 5-8 DEG C / min, and the temperature is kept for 2-4 h to obtain the product B; and step 3, the product B is ground in a mortar, sieved and the aluminum phosphate powder material is obtained. The aluminum phosphate powder material prepared by the method has excellent radiation refrigeration performance.

The invention belongs to the technical field of oral implant materials, and relates to a magnesium metal-guided bone regeneration membrane, a preparation method thereof and a product for preparing the magnesium metal-guided bone regeneration membrane. The magnesium metal-guided bone regeneration membrane comprises a bone repair combination product of the magnesium metal-guided bone regeneration membrane. The preparation method comprises the following steps: respectively providing an electrochemical deposition solution and a polysaccharide-containing solution; the electrochemical deposition liquid comprises a calcium ion donor, a phosphate ion donor and mussel mucin; the method comprises the following steps: placing a magnesium metal matrix in an electrochemical deposition solution, and carrying out first-stage electrochemical deposition under a first electrochemical deposition condition to prepare an intermediate 1; placing the intermediate 1 in an electrochemical deposition solution, performing second-stage electrochemical deposition under a second electrochemical deposition condition, cleaning, and drying to prepare an intermediate 2; placing the intermediate 2 in a solution containing polysaccharide, dip-coating the polysaccharide, and drying; the first electrochemical deposition condition and the second electrochemical deposition condition are respectively as follows: the voltage is 1-5V and 10-60V; the membrane has the biological functions of low corrosion rate, high bonding strength, inflammation resistance, bacteria resistance, osteogenesis promotion and the like.

The application provides a sewage treatment biochemical reaction tank, and relates to the technical field of sewage treatment, which comprises a biochemical tank, wherein the biochemical tank is communicated with a water distribution tank, a plurality of filter material oxidation units are arranged in the biochemical tank, adjacent filter material oxidation units are communicated, sewage enters from one end of the biochemical tank, sequentially passes through a plurality of adjacent filter material oxidation units, and finally enters a sedimentation tank, the filter material oxidation unit comprises a filter material bin and an oxidation tank, the filter material bin is filled with granular calcium carbonate dephosphorization filter material so as to remove phosphate ions in sewage, an aeration pipe is arranged below the oxidation tank, a plurality of aeration holes are formed in the aeration pipe, a curtain type filler is arranged above the aeration pipe, and the curtain type filler is attached with an aerobic microbial membrane; the filter material bin is arranged adjacent to the oxidation tank, and the oxidation tank is communicated with the filter material bin. The application has the advantages of high dephosphorization and denitrification efficiency and good sewage treatment effect.

The application provides a kind of anion and cation double-doped nickel cobalt manganese positive electrode precursor material and its preparation method and application.The nickel cobalt manganese positive electrode precursor material includes precursor matrix material and doping element doped in the precursor matrix material;The doping element includes phosphorus and lanthanum, and the phosphorus doping is phosphate doping.The nickel cobalt manganese positive electrode precursor material provided by the application realizes homogeneous doping of anion and cation through the synergistic doping of phosphate ions and lanthanum, effectively stabilizes lanthanum and phosphorus elements in nickel cobalt manganese, and improves the structural stability of the positive electrode material, thereby improving the electrochemical performance of the positive electrode material.

According to the preparation method, iron ions and phosphate ions are in a high-temperature and high-pressure environment, seed crystal generation and growth are controlled by presetting a specific crystal form, a large number of microcrystals are prevented from being instantly formed, the crystal size is controllable, the crystallinity is high, the consistency is good, and the conversion rate and the crystallization quality of the anhydrous iron phosphate are improved. Anhydrous iron phosphate is directly synthesized, sintering, dehydration and crystallization are not needed, washing water is greatly reduced, energy consumption and waste discharge are reduced, the influence of sintering on product quality fluctuation and poor consistency is avoided, and the production cost is reduced; the crystallinity and the particle size of the final iron phosphate crystal are adjusted by regulating and controlling the seed crystal type, the particle size and the dosage of the seed crystal, the dropwise adding speed and the stirring rotating speed of the iron source and the phosphorus source and the temperature and pressure during reaction, and on the premise that the high crystallinity and the stable and high iron-phosphorus ratio are kept, the specific surface area is adjustable within the range of 5-15 m < 2 > / g, the D50 is adjustable within the range of 0.8-12 microns, and the tap density is adjustable within the range of 0.6-1.55 g / cm < 3 >. And different application requirements are met.

[Problem] To provide a water electrolysis method and a water electrolysis system with which water electrolysis can be highly efficiently performed under non-extreme pH conditions. [Solution] Provided is a water electrolysis method in a buffer solution having a pH of 7 to 12, wherein the buffer solution is composed of an electrolyte solution containing at least one cation species selected from the group consisting of alkali metal cations and at least one anion species selected from the group consisting of borates and carbonates, and the electrolyte solution contains 0.1 to 6.0 mol / kg of phosphate ions.

This invention provides a method for efficiently recovering phosphorus using a Mg-Al layered double hydroxide. [Solution] According to one aspect of the present invention, a method for recovering phosphorus contained in wastewater is provided, comprising: a preparation step of preparing a Mg-Al layered double hydroxide having carbonate ions or hydroxide ions as interlayer anions; an exchange step of contacting the Mg-Al layered double hydroxide prepared in the preparation step with a gas containing hydrogen chloride to obtain a Mg-Al layered double hydroxide in which the interlayer anions have been replaced with chloride ions; and a recovery step of contacting the Mg-Al layered double hydroxide obtained in the exchange step with wastewater to replace the interlayer anions with phosphate ions contained in the wastewater and recover the phosphorus contained in the wastewater.

The present application relates to the technical field of biomedical materials, in particular to a composite gel containing core-shell structure calcium hydroxyapatite microspheres, a preparation method and application thereof. The composite gel comprises a gel carrier and microspheres dispersed in the gel carrier, the microspheres comprise a core and a shell layer coated on the outside of the core, the core is a biodegradable polymer, and the shell layer is calcium hydroxyapatite. After the core-shell structure calcium hydroxyapatite microsphere composite gel of the present application is implanted, calcium hydroxyapatite first contacts human tissues and is degraded into calcium ions and phosphate ions, stimulates collagen production and carries out tissue remodeling; then the biodegradable polymer is also metabolically degraded; and the degradation rate of calcium hydroxyapatite can control the exposure rate of the polymer microspheres, so that a long-term plumping filling effect is achieved; the gel has suitable viscoelasticity, can uniformly suspend the composite microspheres, and after injection into the human body, the microspheres are also uniformly dispersed in the gel.

The invention discloses a nano-iron composite coated slow-release fertilizer as well as a preparation method and application thereof, and belongs to the technical field of agricultural fertilizers. According to the coated slow-release fertilizer disclosed by the invention, the particles formed by granulating the compound fertilizer, the zeolite and the biochar are used as the fertilizer core, and the outer surface of the fertilizer core is coated with the composite coating layer consisting of the polyvinyl alcohol, the carboxymethyl cellulose and the green synthetic nano-iron, so that the prepared coated slow-release fertilizer can prolong the nutrient diffusion path, and phosphate ions are fixed by utilizing the surface effect of the nano-iron; the slow-release fertilizer has good biodegradability, can effectively promote the growth of tomatoes, and can improve the physical and chemical properties of soil; meanwhile, the raw materials used by the coated slow-release fertilizer are all natural degradable materials, the used charcoal-based powder is derived from agricultural wastes, and preparation and application of the coated slow-release fertilizer have important practical significance for promoting agricultural green sustainable development and realizing waste resource utilization.

The invention discloses a calcium-phosphorus implant and a preparation method thereof, and the preparation method comprises the following steps: carrying out sand blasting and double acid etching on metal processed into an implant shape to obtain metal with rough surface and micropores; the metal with the micropores is cleaned, subjected to ultrasonic treatment and dried, and a base body is obtained; under the vacuum condition, calcium ions and phosphate ions are injected into the surface layer of the preheated matrix; and annealing the matrix into which the calcium ions and the phosphate ions are injected to obtain the calcium-phosphorus implant, and sealing the calcium-phosphorus implant. According to the calcium-phosphorus implant and the preparation method thereof, the structure is more stable, and the problem that the calcium-phosphorus coating falls off is solved.

A composition for treating dentin hypersensitivity, comprising: a first component comprising: (i) a first rheology modifying polymer; (ii) a calcium ion source; (iii) a positively charged basic amino acid; and (iv) an acidifying agent, wherein the first component has a pH in the range of about 2.0 to about 7.0; a second component comprising: (i) a second rheology modifying polymer; (ii) a phosphate ion source; and (iii) an alkalizing agent, wherein the second component has a pH in the range of about 7.0 to about 14.0; wherein the first component and the second component are combined into a mixture such that a cationic amorphous calcium phosphate gel composition is created instantly when the pH of the mixture reaches a pH range of about 7.0 to about 9.5.

The present application relates to the field of tooth whitening, and particularly relates to a tooth whitening and enamel remineralization composition and a use method thereof, the tooth whitening and enamel remineralization composition comprising a CPIC gel and an HP gel; the CPIC gel comprising a composite CPIC, an HP activator and a first pH regulator; the composite CPIC comprising calcium ions, phosphate ions and weakly reducing metal ions; the HP activator comprising a transition metal complex for promoting HP decomposition; the first pH regulator being used for controlling the pH value of the CPIC gel in a weak alkaline range; the HP gel comprising HP, an HP stabilizer and a second pH regulator; the HP stabilizer being used for combining the weakly reducing metal ions in the HP gel to prevent HP decomposition; and the second pH regulator being used for controlling the pH value of the HP gel within 4-6. The composition in the present application comprises the CPIC gel and the HP gel, and can simultaneously realize tooth whitening and enamel remineralization.

To provide a magnetoviscous fluid that can achieve both high reliability and high excitation stress even when used at low or high temperatures, and a braking device equipped with such a magnetoviscous fluid. [Solution] A magnetorheological fluid comprising metal magnetic particles modified with an ionic liquid modification site containing a first cationic group and a first anionic group, and an ionic liquid dispersion medium containing a second cationic group and a second anionic group, wherein the first cationic group and the second cationic group are of the same type and are selected from the group consisting of quaternary ammonium ions, imidazolium ions, pyridinium ions and phosphonium ions, and the first anionic group and the second anionic group are selected from the group consisting of tetrafluoroborate ions, hexafluorophosphate ions, trispentafluoroethyltrifluorophosphate ions, bis(trifluoromethanesulfonyl)amide ions, hydrogen phthalate ions and bissulfurylimide ions.

The invention discloses a space-time responsive multifunctional 3D printing bone repair scaffold as well as a preparation method and application thereof. PDGF-BB is loaded on a quick-release carrier, MgP is loaded on a slow-release carrier, and the multifunctional 3D printing bone repair scaffold with MgP loaded on the inner layer and PDGF-BB loaded on the outer layer is prepared through 3D printing. Wherein the PDGF-BB is used as an immunomodulator, the MgP is used as a regeneration inducer, and after the carrier is implanted into a body, according to different carrier degradation rates, the PDGF-BB is degraded and released in a space-time responsive manner to realize early immunoregulation and endothelial cell recruitment, and then magnesium ions and phosphate ions are degraded and released to synergistically promote vascularization and osteogenesis in middle and later periods with the PDGF-BB. In-vitro and in-vivo experiments prove that the 3D printing bone repair scaffold provided by the invention has immunoregulation, angiogenesis promotion and osteogenesis properties, can be used for repairing inflammatory bone injury, and is particularly suitable for repairing inflammatory bone injury caused by diabetes.

The invention discloses a metal phosphate catalyst as well as a preparation method and application thereof in Friedel-Crafts reaction. The catalyst is composed of transition metal ions and phosphate ions, the molar ratio of phosphorus to the transition metal elements is 1: (0.5-7), the total acid amount of the catalyst is in positive correlation with the catalytic activity, and the higher the total acid amount is, the better the reaction effect is. The preparation method comprises the following steps: dissolving a transition metal soluble salt in deionized water, adding a phosphate aqueous solution, stirring to generate a precipitate, dropwise adding nitric acid to dissolve the precipitate, adding urea to obtain a mixed solution, and carrying out hydrothermal reaction, washing, suction filtration and drying to obtain a finished product. During application, the catalyst, phenol and alcohol are put into an intermittent reaction kettle, nitrogen is introduced to maintain stable pressure, heating and stirring reaction are performed, and an alkylphenol product is directly obtained. The catalyst is excellent in catalytic performance, mild in reaction condition and convenient to operate, the alcohol conversion rate and the selectivity of target alkylphenol can be effectively increased, meanwhile, the high conversion rate of acyl chloride is achieved in the acylation process, the process economy is improved, and an efficient and feasible technical scheme is provided for the Friedel-Crafts reaction.

A method for recovery of rare earth elements from apatite mineral comprises dissolving (S10) of apatite mineral of magmatic origin in an acid comprising hydrochloric acid. The dissolving results in a first liquid solution comprising phosphate, calcium and chloride ions, rare earth elements, arsenic and iron. The arsenic and any ferric iron are removed. The first liquid solution is treated (S20) into a second liquid solution by extracting (S22) of a major part of the phosphate ions with an organic solvent. The treating of the first liquid solution into the second liquid solution further comprises partially neutralizing (S75) a raffinate resulting from the extracting of a major part of the phosphate to a pH > 1.5, causing precipitation of phosphates of rare earth elements, and filtering (S76) the precipitated phosphates of rare earth elements from the raffinate.

The invention discloses a tooth whitening strip and a preparation method, and relates to the technical field of oral care. According to the invention, the two key components, namely the adhesive and the desensitization protective agent, of the tooth paste are respectively designed and the synergistic effect of the adhesive and the desensitization protective agent is fully exerted, so that on one hand, the adhesion of the gel layer of the wet tooth paste on the tooth surface and the toughness of the tooth paste are improved, and the gel layer is not easy to fall off or break or remain on the tooth surface; on the other hand, calcium ions, phosphate ions and fluorine ions released by the desensitization protective agent promote generation of acid-resistant fluorapatite and induce remineralization on the enamel surface, and microscopic damage is repaired; and a cross-linked network formed by the adhesive in a gel layer matrix is beneficial to enriching the ions and leading the ions to a to-be-repaired part quickly. The tooth whitening paste can better protect and repair the tooth surface while playing a whitening role, and better oral care experience is provided for a user.

The application discloses a preparation method of modified manganese sand based on phosphate bridging. Phosphate ions are used as a bridge to form stable covalent bonding with hydroxyl groups on the surface of manganese sand. Iron species are firmly fixed on the surface of the carrier in the form of chemical bonding through the action of phosphate bridging to construct stable Fe-Mn bimetallic active centers. The dissolution rate of iron ions is greatly reduced, the service life of the catalyst is prolonged, and secondary pollution caused by the loss of metal ions is avoided. The application scene of manganese sand is expanded from the traditional removal of iron and manganese in underground water to rainwater treatment, advanced treatment of tail water in sewage plants, treatment of refractory organic wastewater and other fields, and is especially suitable for advanced treatment of industrial wastewater with complex components. Through the Fe-Mn bimetallic active center, the decomposition path of sodium hypochlorite is changed, and high-valence iron oxygen species and singlet oxygen are preferentially generated.

The application belongs to the technical field of catalyst preparation, and particularly relates to an organic small molecule for improving hydrogen evolution performance of a molybdenum sulfide-based catalyst, a molybdenum sulfide-based catalyst, a preparation method and application. End groups at two ends of the organic small molecule respectively include a cation and an anion; the anion includes at least one of a carboxylate ion, a sulfonate ion and a phosphate ion; and the cation has a specific structural formula. The organic small molecule can improve the water electrolysis hydrogen evolution performance of an existing molybdenum sulfide catalyst, especially alkaline water electrolysis hydrogen production.