1059 results about "Sequestering Agent" patented technology

The invention relates to a composite reverse osmosis membrane acidic cleaning agent, a preparation method and a cleaning process thereof, and belongs to the technical field of environment-friendly water treatment. The cleaning agent comprises the following components in percentage by mass: 4-8% of inorganic acid, 20-40% of organic acid, 1-3% of a surfactant, 0.5-1% of a chelating agent, 0.5-1% of a compound corrosion inhibitor and the balance of deionized water. The composite corrosion inhibitor is formed by compounding 2-mercaptobenzothiazole and the like according to a specific mass ratio, the molecular weight of polyaspartic acid is 5000, and the molar ratio of Zn to Mo in the zinc-molybdate compound is 2: 1. The preparation method comprises the following four steps: firstly preparing a compound corrosion inhibitor premix, then preparing an acidic base solution, and then sequentially adding the components to finally obtain the cleaning solution. According to the cleaning process, a cleaning agent and deionized water are mixed, the membrane flux recovery rate is larger than or equal to 85% through cleaning of a specific process, the reverse osmosis membrane can be effectively cleaned, and the performance of the reverse osmosis membrane can be recovered.

The invention discloses a method for enriching light metal ions in a pore channel based on carbon nanofiber / carbon fiber nano confinement, and belongs to the technical field of sample pretreatment, and the method comprises the following steps: S1, preparing a carbon nanofiber / carbon fiber confinement material; and S2, putting the carbon nanofiber / carbon fiber confinement material obtained in S1 into a light metal ion solution, and stirring. According to the method for enriching the light metal ions in the pore channel based on the carbon nanofiber / carbon fiber nano confinement, the carbon nanofiber / carbon fiber is used as a confinement fluid carrier, ultrapure water, methanol or n-hexane is used as an extracting agent, a chelating agent does not need to be introduced, the method is green and environmentally friendly, the mass transfer rate is increased, and the method is suitable for large-scale industrial production. Therefore, high enrichment of light metal ions in water is realized.

The invention discloses a tooth repair composition containing mesoporous hydroxyapatite, a tooth repair product and a preparation method and application of the tooth repair composition and the tooth repair product. The tooth repair composition comprises nano-hydroxyapatite, fluoride and a chelating agent, the logarithm value logK of the stability constant K of the chelating agent to calcium ions is 1 < = logK < = 5, and K is measured in an aqueous solution with the temperature of 25 DEG C, the pH value of 7.0 and the ionic strength of 0.1 M; the nano-hydroxyapatite is prepared from nano-scale mesoporous hydroxyapatite, and the nano-hydroxyapatite contains nano-scale mesoporous hydroxyapatite. By adding the specific chelating agent, dynamic balance is formed in the tooth repairing composition, slow release protection can be formed on free calcium ions, the double inactivation effect possibly occurring when hydroxyapatite and fluoride exist at the same time is effectively avoided, the synergistic repairing effect of hydroxyapatite and fluoride is fully exerted, and the tooth repairing effect is improved. The use of fluorides can be greatly reduced, and safety and reliability are achieved.

The invention discloses an amino acid-amide-saccharide composite leaching agent and application thereof, and belongs to the technical field of industrial solid waste recycling and carbon dioxide capture and utilization, the composite leaching agent is formed by compounding a main leaching agent amino acid, an auxiliary leaching agent amide compound and an auxiliary chelating agent saccharide or a derivative thereof. According to the method, through the synergistic effect of the amino acid, the amide and the saccharide chelating agent, the calcium ions in the calcium-containing solid waste can be efficiently and highly selectively leached under the mild condition without additional acid. According to the composite system, through multiple coordination and spatial screening effects, the leaching selectivity of calcium ions can reach 99.5% or above, and dissolution of impurities is effectively inhibited; the zwitterionic characteristics of amino acid and the coordination of amide are utilized to realize proton self-sufficiency in the system and simplify the process; all the components have good biocompatibility and are green and environment-friendly; the composite system can also be used as a crystal modifier to induce high-purity calcium carbonate.

The invention belongs to the technical field of catalytic materials and hydrocarbon reforming, and particularly relates to a high-entropy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a metal salt solution containing lanthanum, chromium, copper, zinc, manganese, nickel, iron and cobalt ions with a chelating agent and a dispersing agent for reaction, carrying out ultrasonic cavitation treatment to obtain sol, adjusting the pH value, gelatinizing under an oil bath heating condition to obtain a colloidal precursor, drying, and calcining in an air atmosphere to obtain a perovskite type high-entropy oxide precursor; and then treating in a reducing atmosphere to obtain the FeZnCuNiCo perovskite type high-entropy alloy catalyst which contains metal components of La, Cr, Ni, Mn, Fe, Zn, Cu and Co and takes a multi-metal alloy active center of Fe-Zn-Cu-Ni-Co as a main component. The high-entropy catalyst can meet the harsh requirements of high temperature, strong carbon deposition driving force and long-period operation in a propane dry reforming reaction, and is suitable for industrial application scenarios of continuous production of high-temperature synthesis gas.

The invention relates to the technical field of glass cleaning agents, in particular to an environment-friendly cover plate glass cleaning agent and a preparation method thereof. The environment-friendly cover plate glass cleaning agent comprises the following raw materials in percentage by weight: 12-20% of inorganic base, 8-12% of a surfactant, 5-8% of a chelating agent, 3-5% of a humectant, 1-3% of an adsorbent, 1-3% of a dispersing agent, 0.3-1% of a buffering agent and the balance of deionized water, the surfactant is dodecyl glucoside and dodecyl ethyoxyl sulphobetaine, and the weight range ratio of the dodecyl glucoside to the dodecyl ethyoxyl sulphobetaine is (3-1): 1; the chelating agent is one or more of sodium gluconate, sodium polyaspartate and sodium polyepoxysuccinate. According to the present invention, the degradable surfactant and the degradable chelating agent are adopted, and the dispersant is added to modify the nanometer titanium dioxide, such that the low pollution property is achieved while the high decontamination efficiency and the anti-fingerprint ability are considered.

The application discloses a thickened oil viscosity reducer for a main viscosity contribution component of colloid and a preparation method thereof. The thickened oil viscosity reducer comprises the following components in percentage by weight: diethylene glycol methyl ether 25-35%, propylene glycol formate 15-25%, dispersant 5-8%, chelating agent 2-4%, anti-coking agent 0.5-1%, anti-swelling agent 1-2% and corrosion inhibitor 1-2%; and the balance is water. The application is a polar + non-aromatic hydrocarbon solvent system; completely avoids high-risk substances such as nonylphenol polyoxyethylene ether, petroleum sulfonate sodium and organic chlorine; is designed in pertinence and can effectively inhibit metal-induced asphaltene bridging; can withstand working conditions from normal temperature to 250 DEG C and up to 300 DEG C; thermal stability is significantly enhanced, and residual carbon after aging is lower than 8%; viscosity reduction efficiency is higher; the system is more stable, flexible in compounding and suitable for field construction.

The invention relates to the technical field of cleaning agents, and discloses a biodegradable environment-friendly cleaning agent, which comprises: a composite surfactant system comprising at least one nonionic surfactant, an ampholytic surfactant and a chelating functional surfactant; the plant extract oil system comprises limonene and a eucalyptus oil mixture; the functional particle system comprises nanoscale enzyme microcapsules and slow-release type oxidized particles; the natural polysaccharide stable network system comprises at least two polysaccharide thickeners and a bio-based cross-linking agent, and the assistant system comprises a metal ion chelating agent, a buffer acid system and water. By introducing sodium polyaspartate as a green chelating surfactant, efficient chelating of calcium and magnesium ions under a hard water condition is realized, the cleaning power is remarkably improved, water stain residues are reduced, and the cleaning performance with wider adaptability is obtained.

The invention relates to the technical field of OLED (Organic Light Emitting Diode) manufacturing process etching processes, in particular to a silver etching solution for an OLED manufacturing process as well as a preparation method and application of the silver etching solution. The silver etching liquid comprises nitric acid, phosphoric acid, a buffer agent, a metal ion chelating agent and an ionic liquid inhibitor, the ionic liquid inhibitor comprises 1-butyl-3-methylimidazole phosphate, the metal ion chelating agent is selected from at least one of pyromellitic acid, diethylenetriamine pentaacetic acid and ethylenediamine tetramethylene phosphoric acid, and the buffer agent is selected from at least one of sodium chloride, sodium chloride and sodium chloride. The buffering agent comprises acetic acid, and all the components are prepared according to a specific mass ratio. The etching solution can balance the etching rate of silver and indium tin oxide, avoid silver residues and black spot defects, prolong the service life of the solution, reduce the use of a volatile buffer agent, adapt to the OLED fine manufacturing process, improve the product yield and reduce the production cost, and is suitable for etching of a metal substrate in the OLED manufacturing process.

The invention relates to the technical field of collagen extraction, and provides a collagen extraction process for increasing hydroxyproline content, which sequentially comprises the steps of raw material pretreatment, deliming and degreasing, directional enzymolysis, gradient pressure-temperature synergistic extraction, purification, concentration and drying, a composite pretreatment agent containing a proline hydroxylase activator, EDTA-2Na and neutral protease is adopted in the raw material pretreatment; deashing and degreasing are combined with a chelating agent solution and ultrasonic treatment; a compound enzyme solution composed of trypsin, papain and proline hydroxylase is used for directional enzymolysis; a two-stage gradient pressure-temperature cooperation mode is adopted for extraction; purification is realized through combination of gel filtration chromatography and ion exchange chromatography; and finally carrying out freeze concentration and vacuum freeze drying to obtain the product. According to the process, through a multi-step synergistic effect, the content of hydroxyproline in collagen is remarkably increased, the product purity is high, natural functional characteristics are reserved, and the process is suitable for the fields of food, cosmetics, biological medicine and the like.

The invention discloses a cleaning composition, a preparation method and a cleaning sheet, and belongs to the field of cleaning products. The cleaning composition is prepared from the following raw materials in parts by mass: 10-30 parts of an amino acid surfactant; 1 to 20 parts of an anionic surfactant; 15 to 45 parts of plant polysaccharide; 5 to 15 parts of a shape promoting agent; 1 to 10 parts of a nonionic surfactant; 0.5 to 5 parts of an ampholytic surfactant; 0.5 to 5 parts of a plant extract; 0.5 to 5 parts of a humectant; 0.1 to 5 parts of a chelating agent; 0-5 parts of essence; an enzyme preparation; 0 to 5 parts; and 20 to 105 parts of water. The washing and protecting sheet has the characteristics of low sensitivity and mildness, can be in direct contact with skin, is moderate in dissolving speed and cleaning power, and can be applied to the fields of hair washing, bathing, face cleaning, hand washing, underwear cleaning, maternal and infant fabric cleaning, toy cleaning and the like.

The invention discloses a preparation process of a rare earth precipitation resistant electrophoretic coating for an automobile body. The preparation process comprises the following steps: S1, preparing a stable solution; s2, preparing a rare earth chelating solution; adding lanthanum lactate into the stable solution for multiple times, and adding ammonium ceric sulfate for multiple times after the lanthanum lactate is completely dissolved; s3, preparing a resin base solution; s4, preparing mixed slurry; s5, adding a solvent and an auxiliary agent; a five-membered ring chelate with thermodynamic stability is formed by carboxyl, hydroxyl and rare earth elements in sodium citrate, rare earth ions can be tightly wrapped through strong coordination bonds, namely, empty orbits of the rare earth ions and lone pair electrons of a chelating agent form coordination bonds, so that the rare earth ions cannot be dissociated in a system, and the rare earth ions are prevented from being dissociated in the system. And a path of generating hydroxide precipitates by free rare earth ions is thoroughly blocked, so that rare earth elements are effectively ensured to be uniformly distributed in the electrophoretic paint, and the surface of a raw material treated by a subsequent electrophoresis process is more uniform.

The invention relates to a preparation method of a lithium difluoro bis (oxalate) phosphate concentrated solution, and belongs to the technical field of lithium battery electrolyte additives. Adding lithium oxalate into a solvent, stirring and dissolving to obtain a lithium oxalate solution; the method comprises the following steps: adding a modified fluorine ion chelating agent into a lithium oxalate solution, stirring, filtering, putting into a reactor, and slowly introducing phosphorus pentafluoride gas; after the introduction is finished, heating and stirring for reaction; after the reaction is finished, filtering reaction liquid to remove unreacted solid impurities, so as to obtain a lithium difluoro bis (oxalate) phosphate concentrated solution; the modified fluorine ion chelating agent is prepared from D301 ion exchange resin, dichloroethane, propylene-1-base boronic acid pinacol ester, mercaptoethyl guanidine dihydro bromide and sodium tert-butoxide. The lithium difluoro bis (oxalate) phosphate prepared by the method is high in purity and high in yield, and meets the use requirements of lithium ion battery electrolyte on lithium salt.

The invention provides a double-dosage-form copper acid etching solution as well as a preparation method and application thereof. The double-dosage-form copper acid etching solution comprises an agent A and an agent B, the agent A comprises the following components in parts by weight: 15-20 parts of an oxidizing agent, 4-7 parts of an organic acid chelating agent, 0.1-0.5 part of inorganic acid, 0.5-2 parts of alkali, 1-2 parts of a surfactant and 0.01-0.1 part of a metal corrosion inhibitor; the agent B is prepared from the following components in parts by weight: 25 to 30 parts of organic acid chelating agent, 0.2 to 0.5 part of inorganic acid, 15 to 20 parts of alkali, 1 to 2 parts of surfactant and 0.1 to 0.3 part of metal corrosion inhibitor. The double-agent copper acid etching solution provided by the invention can be compatible with etching of Cu / Mo and Cu / MTD film layers, can be compatible with etching of film layers with different thicknesses, and is long in service life, low in CD Bias, free of chamfer cracks, good in residue, small in taper variation and short in etching time.

The invention relates to an ultra-clean high-purity polyethylene purification process based on supercritical fluid extraction, which is characterized in that supercritical CO2 containing an entrainer is used as a medium to wash polyethylene powder, and the entrainer comprises the following components: an acid solution, an alcohol solvent and a chelating agent. Compared with the prior art, the method has the advantages that the polyethylene powder is purified on the basis of the supercritical CO2 containing the entrainer, residual organic impurities in polyethylene can be deeply removed, meanwhile, the acid solution, the alcohol solvent, the chelating agent and the like are used as the entrainer, metal and other impurities which are difficult to dissolve in the supercritical CO2 are converted into soluble components, and the purity of the polyethylene powder is improved. And the polyethylene is separated from the polyethylene powder, so that deep purification of the polyethylene is realized.

The invention discloses a hydrogenation device scale inhibitor for heavy high-sulfur raw oil and a preparation method of the hydrogenation device scale inhibitor, and relates to the technical field of scale inhibitors. The scale inhibitor is prepared from a polyisobutylene succinimide dispersing agent, a high-temperature-resistant scale inhibition dispersing agent, an anti-rust agent, an imidazoline corrosion inhibitor, an antioxidant, a sulfide chelating agent, a clearing agent, cup carbazole alkylbenzene sulfonate and a solvent in specific parts by weight. The preparation method comprises the following steps: heating the solvent to 80-100 DEG C, sequentially adding the other components, and stirring for 30-40 minutes. Aiming at the characteristics of heavy high-sulfur raw oil, the scale inhibitor realizes high scale inhibition rate, excellent high-temperature stability and strong sulfur corrosion resistance through a multi-component synergistic effect, effectively solves the problems of scaling and corrosion of a hydrogenation device, prolongs the operation cycle of the device, and is suitable for a hydrogenation process of high-sulfur and high-asphaltene raw oil.

The invention provides a preparation method of aquatic organism bottom modification particles, which comprises the following steps: adding bacillus subtilis liquid, an oxygen producer and an adhesive into a base material, stirring and granulating to obtain oxygen release core particles; stirring the oxygen release core particles in a roller coating machine, and intermittently spraying a chelating agent in the stirring process to obtain transition particles; and spraying the heavy metal adsorption sol on the transition particles, spraying the bonding solution after cross-linking and curing, then roll-coating the counterweight particles, and drying to obtain the aquatic organism bottom-changing particles. Reducing harmful gas and nitrogen and oxygen indexes are reduced, heavy metals and fine suspended solids are captured synchronously, and the oxidation-reduction buffer capacity of the bottom mud and the stability of a water body are recovered.

The invention discloses a potassium propionate continuous synthesis process, and relates to the technical field of potassium propionate synthesis, the process comprises the following steps: S1, raw material pretreatment: selecting fermentation waste liquid containing propionic acid and acetic acid and potassium ore leaching liquid containing potassium hydroxide and potassium carbonate as composite raw materials, adding a composite chelating agent into the potassium ore leaching liquid, and uniformly stirring; according to the method, the composite raw material system composed of the fermentation waste liquid and the potassium ore leaching liquid is adopted, and the composite chelating agent is added, so that resource utilization of industrial waste is achieved, the raw material cost is reduced, meanwhile, impurities are prevented from interfering with continuous reaction, and through gradient temperature control-pressure cooperative regulation and linkage regulation of the PLC system, the yield is increased. The problem of product deliquescence caused by local overheating is solved, volatilization loss of propionic acid is reduced, the adaptability of the technology to raw material batch fluctuation is improved through raw material concentration online detection and dynamic parameter adaptation, the continuous production stability is guaranteed, and finally synchronous improvement of the potassium propionate synthesis efficiency and the product quality is achieved.

The invention belongs to the technical field of contact lens care, and provides temperature-sensitive contact lens eye-moistening gel and a preparation method thereof. The temperature-sensitive contact lens eye-moistening gel is prepared from the following raw materials in parts by mass: a gel matrix, a surfactant, an osmotic pressure regulator, an active component, a chelating agent, a buffering agent and the balance of injection water, the composition of the gel matrix is defined. Chitosan, sodium hyaluronate and polyvinyl alcohol are compounded to serve as a gel matrix, a polyelectrolyte compound is formed, gelation time is shortened, gel strength and swelling resistance are improved, biocompatibility is improved, and drug-loaded delivery of active ingredients is achieved; the gel matrix and the surfactant are reasonably selected, the viscosity of the solution is increased, the gelation time is shortened, the excellent effect of relieving eye fatigue and dryness is achieved, the wearing comfort of the contact lens is remarkably improved, and the oxygen permeation effect of the contact lens is not obviously reduced after gel forming.

The application relates to the technical field of ink solvents, and particularly discloses an environmentally-friendly water-based ink solvent with high drying efficiency and a preparation method thereof, the environmentally-friendly water-based ink solvent with high drying efficiency comprises the following raw materials in parts by weight: 40-60 parts of water, 30-50 parts of a bio-based alcohol compound, 5-15 parts of n-propyl acetate, 0.3-1 part of tripropylene glycol n-butyl ether, 1-3 parts of nano-cellulose, 0.5-1 part of calcium chloride, 1-2 parts of a pH regulator and 0.2-0.4 parts of a chelating agent. The environmentally-friendly water-based ink solvent with high drying efficiency and the preparation method thereof can be used for ink printing, and have the advantages of high drying efficiency and good stability.

Laundry additive compositions that include a metal sequestration agent and that may be characterized by an acidic pH. Related methods of treating a fabric, for example with a wash liquor and a rinse liquor, with such compositions and / or agents. Uses of such laundry additive compositions.

The invention relates to the technical field of polishing compositions, and discloses a high-dispersity silicon oxide-based polishing solution for silicon wafers and a preparation method thereof, the high-dispersity silicon oxide-based polishing solution comprises the following raw materials by weight: 10-20 parts of modified nano silicon oxide, 0.3-0.8 part of a dispersant, 0.1-0.3 part of a chelating agent, 0.1-0.3 part of a surfactant, 0.01-0.05 part of an antifoaming agent, 0.05-0.15 part of a corrosion inhibitor, 0.5-1.2 parts of a pH regulator, 0.1-0.3 part of a brightener, and 80-100 parts of deionized water. The polishing solution has high dispersibility, is suitable for long-term storage, has stable performance and good polishing performance, is suitable for fine polishing among various fields, is simple and convenient in production process, is green and environment-friendly in production process, and has important industrial application value.

A high solids, sprayable, fast drying, ready-mixed setting-type joint compound comprising a blend of a joint compound mixture comprising: joint compound mixture ingredients comprising: calcium sulfate hemihydrate (e.g. US Gypsum's HYDROCAL C-Base), a chelating agent, and water; and an activator mixture, wherein the activator mixture comprises: activator mixture ingredients comprising: inert filler, set accelerator, and water, wherein a weight ratio of joint compound mixture:activator mixture is 1:1 to 100:1, wherein the activator mixture viscosity is the same as the joint compound mixture viscosity plus or minus 50 percent, and wherein the joint compound has about 55 to about 80 wt. % solids and a viscosity of 2,500-28,000 cps.

The invention relates to the technical field of collagen, in particular to a pig collagen chemical decellularization method based on a supercritical fluid technology, which comprises the following steps: taking fresh pigskin collagen, cleaning, cutting, and carrying out physical pretreatment; putting the pretreated collagen into a supercritical reaction kettle, introducing supercritical fluid, controlling the pressure to be 30-42 MPa and the temperature to be 40-50 DEG C, and maintaining for 10-20 minutes to establish a supercritical environment; injecting a mixed reagent containing ethanol, protease and a chelating agent into the supercritical reaction kettle, and stirring for 1.0-2.0 hours; after the treatment is finished, reducing the pressure of the reaction kettle in a stepped manner at the rate of 0.5-1MPa / min, introducing supercritical fluid or a mixed fluid of the supercritical fluid and ethanol for replacement during the period, and finally reducing the pressure to normal pressure; and taking out the collagen, carrying out enzymolysis treatment, and washing with a sterile solution to obtain the collagen. And the DNA residual quantity is greatly reduced through supercritical multiphase fluid cooperation and a nano-enzyme directional delivery technology.

The present disclosure pertains to an extracellular vesicle purification kit that contains a component that does not dissolve in pure water but dissolves in a chelating agent aqueous solution.

The invention provides a nano lipid carrier system with photo-thermal stability as well as a preparation method and application thereof, and relates to the technical field of nano preparations. The lipid carrier comprises the following components: an active substance, hydrogenated lecithin, simmondsia chinensis seed oil, SpectrastHCP, an emulsifier and a chelating agent, wherein the active substance is resveratrol. The lipid carrier has better stability, is stable under the conditions of dilution, centrifugation and the like, and can be stored for a long time in a severe environment. Indissolvable substances such as resveratrol are wrapped by the lipid carrier, so that the water solubility of the substances can be remarkably improved, and the problem of difficult dissolution is solved. In addition, the wrapping of the lipid carrier can effectively isolate the influence of oxygen, illumination and other environmental factors, the stability of the active matter can be improved, and meanwhile, the discoloration problem is effectively improved. When the nano-scale lipid carrier is applied to a preparation, the nano-scale lipid carrier can more easily penetrate through the skin barrier and deeply penetrate into the deep layer of the skin, and the effect of transferring active matters is more facilitated.

The invention discloses an ecological restoration matrix for a mining area as well as a preparation method and application of the ecological restoration matrix. The ecological restoration matrix for the mining area comprises the following components in parts by weight: 30-50 parts of modified coal gangue, 20-35 parts of decomposed straws, 10-20 parts of bentonite, 8-15 parts of zeolite powder, 5-12 parts of charcoal, 0.5-2.0 parts of a compound microbial agent, 1-3 parts of a water-retaining agent and 0.3-1.0 part of an organic acid chelating agent. The invention further discloses a preparation method and application of the ecological restoration matrix for the mining area. The ecological restoration matrix for the mining area realizes balance of heavy metal passivation and plant nutrient absorption, unification of physical structure stability and water retention and air permeability, and coordination of rapid soil formation and long-term sustainability. The method is simple in process, low in cost and suitable for industrial application.

The invention belongs to the technical field of biological materials, and particularly relates to a long-term stable silk fibroin solution and a preparation method thereof, and the preparation method comprises the following steps: (1) dissolving a composite stabilizer in water, and uniformly mixing to obtain a stable solution; wherein the compound stabilizer comprises a micromolecular hydrogen bond chelating agent and a macromolecular steric hindrance agent; (2) freeze-drying and dissolving silk fibroin in the stabilizing solution to obtain a silk fibroin solution; and (3) sterilizing the silk fibroin solution. By utilizing the synergistic effect of the micromolecular hydrogen bond chelating agent and the macromolecular steric hindrance agent, the stabilizing effect can be adjusted according to the storage environment, and the stable silk fibroin solution can be stored at 4-7 DEG C for a long time (more than or equal to 6 months) and can be stored at room temperature for more than or equal to 3 months.

The invention relates to the field of preparation of polymer materials, and discloses a polyolefin deliming method which comprises the following steps: S1, mixing a polyolefin raw material glue solution with an ionization reagent and a chelating agent for reaction to obtain a polyolefin material containing a complex; s2, the polyolefin material containing the complex and a diluent are subjected to first mixing, and the content of polyolefin in every 100 mL of first mixed material liquid is smaller than or equal to 1 g; and S3, carrying out second mixing on the first mixed material liquid and an extraction precipitant, and then separating a solid-phase material from the second mixed material. According to the method, the wrapping of the polyolefin on the metal compound can be reduced, the de-ashing effect is improved, and complex operation and too high material and equipment investment are avoided.

The invention relates to the technical field of photocatalytic materials, in particular to a metal single atom loaded defect carbon nitride catalyst and a preparation method and application thereof. The method comprises the following steps: by taking melamine as a nitrogen source, soluble metal salt as a metal source and ethylenediaminetetraacetic acid as a chelating agent, carrying out freeze drying in a solvent system, calcining in a protective atmosphere, and carrying out thermal polymerization, so as to obtain the metal single atom loaded defective carbon nitride catalyst. The metal in the soluble metal salt is copper, iron or manganese. Precise anchoring and high dispersion of metal ions are achieved through complexing of ethylenediamine tetraacetic acid, a stable metal-N coordination structure is formed, metal agglomeration is avoided, a defect structure is constructed synchronously, and the metal monatomic loading capacity is 1 wt.%-7 wt.%. The catalyst can efficiently catalyze and activate peroxymonosulfate and rapidly degrade antibiotic pollutants such as tetracycline, has the advantages of being low in preparation cost, environmentally friendly, high in catalytic activity and high in stability, and is suitable for the field of water pollution remediation.