63 results about "Organic complexation" patented technology

The invention discloses a method for simulating reaction migration of metal in a xanthate-loaded porous medium. On the basis of a coupling reaction mechanism of metal and an organic complexing agent (xanthogenate) in a porous medium, a multi-surface morphology complexing model (MSM) containing soil native components and xanthogenate is constructed and is combined with a reactive migration numerical model (a coupling water flow and solute migration equation); according to the method, through model calibration and experimental verification, the dynamic migration process of each metal component and the competitive retention distribution of the metal component on different solid-phase components can be accurately simulated and quantitatively analyzed under the complex condition that metal and xanthate coexist.

The invention provides a modified charcoal-based slow-release rare earth lanthanum soil conditioner and a preparation method thereof, and relates to the technical field of soil conditioners, the saline-alkali soil conditioner is used for reducing soil salinity and alkalinity, fixing heavy metals in soil, improving soil structure and slowly releasing rare earth elements into soil; the preparation method comprises the following steps: 1, preparing a rare earth lanthanum compound; modifying the biochar; a phosphate; dewatering the river sludge; an organic complexing agent; step 2, dissolving a rare earth lanthanum compound and an organic complexing agent in deionized water, and reacting to generate a complex solution; step 3, preparing modified biological carbon; step 4, loading lanthanum; and step 5, mixing the matrix to obtain the saline-alkali soil conditioner. Lanthanum nitrate and sodium citrate are converted into a complex solution, the lanthanum citrate complex has good stability, lanthanum can be effectively fixed in the solution in the form of the complex, the lanthanum is prevented from precipitating or losing in the subsequent treatment process, and the slow release effect of lanthanum is achieved.

The invention relates to the technical field of concrete admixtures, and particularly discloses a waterproof dense setting accelerator and a preparation method and application thereof, the waterproof dense setting accelerator comprises the following components by weight: 5-10 parts of a suspending agent, 50-250 parts of modified silica sol, 100-250 parts of an organic complex waterproof agent, 400-600 parts of a setting accelerator, and water; wherein the modified silica sol is obtained by modifying acidic silica sol with a modifier, and the modifier is a silane coupling agent; wherein the organic complexing waterproofing agent is a higher fatty acid aluminum complex. After the waterproof dense setting accelerator is doped into concrete, a large amount of air entraining of the concrete cannot be caused, microcracks of sprayed concrete can be filled, the compactness of the concrete is further improved, meanwhile, a hydrophobic effect is formed in the sprayed concrete and on the surface of the sprayed concrete, and the addition of the organic complexing waterproof agent can promote the condensation of the concrete, so that the waterproof performance of the concrete is improved. And the concrete can be quickly coagulated by matching with a coagulant.

The invention relates to the technical field of p-fluorobenzaldehyde production, and particularly discloses a production process of high-purity p-fluorobenzaldehyde. The invention relates to a production process of high-purity p-fluorobenzaldehyde. The production process comprises the following steps: S1, carrying out a chlorination reaction by taking p-fluorotoluene and chlorine as raw materials to prepare a mixed chlorination solution of p-fluoromethyl benzyl monochloride, p-fluoromethyl benzyl dichloride and p-fluoromethyl benzyl trichloride; s2, adding an organic complexing agent, which is a water-soluble aprotic solvent, into the mixed chlorinated liquid prepared in the step S1, and then performing vacuum rectification to obtain distillate and residual liquid; rectifying by taking the residual liquid as a raw material to obtain kettle liquid and rectified liquid; and S3, carrying out hydrolysis reaction by taking the rectification liquid and water as raw materials, separating, and drying to obtain the product. The production process of the high-purity p-fluorobenzaldehyde has the advantages of high raw material conversion rate, high product purity and few three-waste products.

The invention discloses a method for preparing gamma aluminum oxide nanosheets based on precise regulation and control of complex precipitation, which comprises the following steps: introducing an organic complexing agent into a water phase system, constructing an organic-inorganic mixed solvent environment, and inducing an aluminum precursor to generate two-dimensional oriented growth under an alkaline condition to obtain a flaky boehmite precursor; then carrying out high-temperature calcination to prepare gamma aluminum oxide nanosheets; the preparation method is simple in process, mild in condition and easy for large-scale preparation, and the prepared gamma aluminum oxide nanosheet can still keep stable sheet-shaped morphology and gamma phase structure after being re-sintered for five times at 1000 DEG C, has a hierarchical pore structure and a specific surface area of more than 40 m < 2 > / g, and shows excellent high-temperature structural stability; the material can be widely applied to the fields of high-temperature catalyst carriers, adsorption separation materials, advanced ceramics and the like, and has a good application prospect.

The invention relates to the field of wastewater treatment, in particular to a water quality conditioner added with improved humic acid and a preparation method of the water quality conditioner. The water quality conditioner added with the improved humic acid is obtained by compounding the improved humic acid and interface functionalized hematite nanocrystals; the improved humic acid is methacrylic acid grafted phenol modified humic acid; the interface functionalized hematite nanocrystals are selected from one of caffeic acid interface functionalized hematite nanocrystals and benzimidazole interface functionalized hematite nanocrystals. No toxic reducing agent or precious metal is used; caffeic acid and benzimidazole are degradable or low-toxicity small molecules, and the residual quantity is low; the final product is Cr (III) hydroxide or organic complex, can be further precipitated or recycled, and accords with the concept of green water treatment. All reaction preparation conditions are mild, and equipment requirements are low. The raw materials are wide in source, low in cost and suitable for industrial production.

The application relates to the field of agricultural planting cultivation technology and discloses a high-temperature-resistant and stress-resistant millet cultivation regulation method, which comprises the following steps: adding deionized water, boric acid and 1,2-propylene glycol into a reaction kettle, adding potassium hydroxide aqueous solution dropwise after heating and constant temperature to adjust pH value and react; cooling water is introduced to cool, calcium lignosulfonate is added to form a fluid system through high-shear dispersion; gamma-aminobutyric acid is added and stirred to obtain a high-temperature-resistant and stress-resistant foliar spraying composition product; the relative water content of soil is maintained before millet seeding to the jointing stage, and the composition product is diluted and uniformly sprayed on the millet leaves before continuous high temperature and low humidity drought weather predicted by the weather forecast. The boric acid is converted into an organic complex state, the water solubility and leaf absorption rate of the effective component are improved, the stomata are adjusted through gamma-aminobutyric acid, the calcium lignosulfonate is used to form a film on the leaves, and the damages caused by high temperature and drought to the plants are synergistically relieved.

The invention relates to the technical field of mineral processing and environment-friendly chemical agents, in particular to a novel environment-friendly gold extraction agent and a preparation method thereof. The method aims at solving the problems that in existing gold hydrometallurgy, a traditional cyanide gold extraction agent is highly toxic and pollutes the environment, and the environment-friendly gold extraction agent is insufficient in the aspects of leaching efficiency, preparation and application convenience, energy consumption and universality. The method is characterized by comprising the following steps: mixing a bio-based organic complexing agent aqueous solution with the weight-average molecular weight of 500-2000 with an oxidizing agent, adjusting the pH value, adding an inorganic salt auxiliary agent, heating for reaction, and finally carrying out spray drying to obtain the powdery gold extraction agent. By the adoption of the technical scheme, the effects of being environmentally friendly, low in toxicity, high in leaching efficiency, high in universality to complex ore, low in preparation energy consumption, rapid in product dissolution, convenient and fast to apply and the like can be achieved.

This invention discloses a nitrogen-sulfur co-doped multi-chamber carbon-supported copper nanocluster composite material and its preparation method. By integrating polyether F127, 2,6-diaminopyridine, sodium dodecylbenzenesulfonate, fulvic acid, and copper acetate (II), a semi-open and surface-fully embedded copper cluster multi-chamber carbon was successfully constructed. The surface of this multi-chamber carbon is rich in -NH2 and -SO3. ‑ With abundant active groups, it not only boasts a large specific surface area and ample adsorption sites, but also exhibits excellent anti-interference and wide pH adaptability. As an environmentally friendly material, it can simultaneously and efficiently adsorb and remove Cu²⁺ from electroplating wastewater. + Ni² + Pb² + Cd² + It contains heavy metals and organic complexing agents such as ethylenediaminetetraacetic acid (EDTA) and hydroxyethylidene diphosphonic acid (HEDDI). After electroplating wastewater treatment, it achieves convenient solid-liquid separation and recovery through centrifugation and filtration. After acid washing and alcohol washing regeneration, it exhibits excellent cycle stability. With its superior purification efficiency and recycling advantages, it has shown promising development potential in the field of electroplating wastewater treatment.

The invention discloses a preparation method of a titanium-containing heteroatom molecular sieve, and belongs to the technical field of catalytic synthesis. In the preparation process of the titanium silicalite molecular sieve TS-1, solid organic acid complexed titanium is used as a titanium source, so that introduction of an organic complexing agent is avoided, the pressure of alcohol removal in the preparation process is reduced, and the energy consumption is reduced; as the selected titanium source is dissolved in water, has certain acidity and slows down the hydrolysis speed of the titanium source, the hydrolysis speed of the silicon source is further matched, so that the titanium source better enters a molecular sieve framework, the TS-1 molecular sieve with more uniform framework titanium distribution and higher content is obtained, the catalytic activity of the molecular sieve is improved, and the conversion rate and selectivity of a product are greatly improved; and the method has a very good application prospect.

The invention discloses a composite substrate for synergistically improving sandy-saline-alkali soil based on multi-source solid waste and a preparation method thereof. The composite substrate adopts a three-layer structure design: a bottom layer is formed by mixing industrial solid waste particles and a salt adsorption material to form a salt barrier layer; the middle layer is formed by compounding an organic waste fermentation product, a salt-tolerant microbial agent and organic complex acid, and is used for providing organic matters and activating biological salt elimination; the surface layer is formed by mixing sandy soil, a slow-release water-retaining agent and a spreader, and the water retaining capacity is enhanced. The preparation method comprises the steps of solid waste gradient activation, organic waste fungicide synergistic fermentation, layered salt control laying and the like. Compared with the prior art, through synergistic interaction of multi-source waste, the soil salt content is reduced by 50%-70%, the conductivity is reduced by 35%-20%, the water retention rate is larger than or equal to 80%, the seedling survival rate is increased by 30%-50%, the comprehensive cost is only 30%-45% of that of a traditional material, and the composite saline alkali soil remediation agent is suitable for composite saline alkali soil remediation of road slopes, desertification regions and the like.

The invention discloses an etching solution for displaying the three-dimensional shape of a nickel-based metal material and a display method, and relates to the technical field of etching solutions, the key points of the technical scheme are that the etching solution for displaying the three-dimensional shape of the nickel-based metal material is formed by compounding an alcohol solvent, inorganic strong acid and an organic complexing agent; wherein the organic complexing agent accounts for 1%-3% of the total weight of the etching liquid. The special etching solution formula designed by the invention has a good dissolution rate on a nickel-based superalloy matrix, has excellent protectiveness on various types of carbides by virtue of the synergistic effect of the organic complexing agent (tartaric acid), and is suitable for wide nickel-based superalloy systems.

The invention relates to the technical field of chemical nickel plating, and discloses a chemical nickel plating solution based on the synergistic effect of a multi-element complexing agent and a preparation method thereof.The chemical nickel plating solution comprises, by weight, 20-35 parts of nickel salt, 25-40 parts of sodium hypophosphite, 30-48 parts of the multi-element complexing agent, 0.1-5 parts of a stabilizer, 0.5-3 parts of a surfactant and the balance deionized water; wherein the multi-element complexing agent comprises an organic complexing agent and nanoparticles, the organic complexing agent comprises a weak complexing agent and a strong complexing agent, and the nanoparticles comprise silicon dioxide or carbon quantum dots. A weak complexing agent and a strong complexing agent are added step by step in a gradient mode, surface functionalized nano-particles are combined, the weak complexing agent is preferentially combined with nickel ions to promote rapid nucleation of a plating layer, the strong complexing agent later enhances complexing stability, the nano-particles provide heterogeneous nucleation sites and optimize the microstructure of the plating layer, and the surface functionalized nano-particles are formed. Therefore, densification, low porosity and high mechanical performance of the plating layer are realized.

The invention provides a metal-nitrogen-carbon material and a preparation method thereof, and relates to the technical field of functional composite material preparation. The preparation method comprises the following steps: providing a metal source, a nitrogen source, a carbon carrier and a polytetrafluoroethylene emulsion, dissolving the metal source and the nitrogen source in an alcohol solvent to obtain a metal-organic complex solution, adding the carbon carrier and the polytetrafluoroethylene emulsion into the metal-organic complex solution, and carrying out ball milling to obtain homogeneous composite slurry, the preparation method comprises the following steps: preparing a homogeneous-phase composite slurry, sequentially drying and grinding the homogeneous-phase composite slurry to obtain carbon-based composite precursor powder, and finally performing microwave pyrolysis on the carbon-based composite precursor powder under a vacuum condition at the temperature of 300-350 DEG C, the power of 500-700 W and the duration of 40-60 minutes to obtain the metal-nitrogen-carbon material. According to the method, the metal-nitrogen-carbon material can be prepared only through one-time medium-temperature microwave pyrolysis, and compared with the prior art, the technological process is greatly shortened, energy consumption is remarkably reduced, the single-batch yield is high, and the method is suitable for continuous large-scale production.

A multi-barrier coupled treatment process for organic complexed heavy metals in wastewater from battery cathode material production is disclosed, relating to the field of wastewater treatment. The method involves: 1. Adjusting the pH of the wastewater to 3.0-4.5; 2. Adding iron salt and peracetic acid to an oxidation reaction tank; 3. Achieving primary removal of heavy metals through neutralization and precipitation after oxidation; 4. Adjusting the pH of the wastewater back to 6.0-6.5; 5. Passing the wastewater sequentially through a primary adsorption unit and a secondary adsorption unit. This invention utilizes the low bond energy characteristics of PAA and the synergistic oxidation advantages of multiple free radicals to solve the bottleneck problems of incomplete complex breaking, large sludge production, and narrow pH application range in traditional methods. After treatment by this invention, the total nickel concentration in the effluent is less than 0.05 mg / L, and the total cobalt concentration is less than 0.02 mg / L, consistently exceeding the limits of the "Emission Standard of Pollutants for Battery Industry" (GB 30484-2013), demonstrating broad industrial application prospects.

The invention provides a charge self-assembly catalyst layer and a preparation method and application thereof. The charge self-assembly catalyst layer comprises a catalyst and an ionomer; the catalyst comprises a first catalyst and a second catalyst, the first catalyst comprises a first carrier, an active metal component and an organic complexing component, the active metal component and the organic complexing component are loaded on the first carrier, and the organic complexing component is a first ionic organic functional group; the second catalyst comprises a second carrier and an active metal component loaded on the second carrier; the ionomer contains a second ionic organic functional group, and the first ionic organic functional group and the second ionic organic functional group are electrically repellent and / or attract each other. According to the method, the poisoning condition of the catalyst is obviously relieved, coating of the ionomer on active metal components in the catalyst is reduced, more active sites are exposed, and the utilization rate of the catalyst is greatly increased.

The invention relates to the technical field of batteries, in particular to a battery monomer, a preparation method of a secondary battery, an electrolyte and an electric device. Each single battery comprises a positive pole piece, a negative pole piece and an electrolyte, at least partial structures of the positive pole piece and the negative pole piece are located in the electrolyte, the electrolyte comprises a metal ion complexing agent, and the metal ion complexing agent comprises an organic complexing agent and / or an inorganic complexing agent; the organic complexing agent comprises at least one of phenanthroline, a crown ether compound, oxalic acid, citric acid, tartaric acid, ethylenediamine tetraacetic acid and deferoxamine; and / or the inorganic complexing agent comprises at least one of sodium oxalate, sodium citrate, sodium tartrate and sodium ethylene diamine tetracetate. The metal ion complexing agent in the electrolyte can be combined with impurity metal ions in the electrolyte to form a stable complex, so that the risk that the impurity metal ions are separated out into dendritic metal foreign matters at an anode to pierce a diaphragm to cause self-discharge of the battery is reduced.

The present invention relates to an anti-microbial composition and preparation process and use thereof. The anti-microbial composition comprises at least one silver compound, at least one organic complexing agent and one or more bases, wherein the organic complexing agent has the structure of Formula (I), wherein R1 is independently hydrogen, a linear or branched C1-C5 alkyl, or an amino group optionally substituted with a C1-C5 alkyl, R2 is independently a linear C1-C5 alkylene, optionally substituted with a C1-C5 alkyl, and R3 is independently hydrogen, a linear or branched C1-C5 alkyl, or a linear or branched C2-C5 alkyl substituted with a carboxyl group. When formulated into an aqueous composition, the composition has good physical stability and even good color stability, particularly against heat and / or light, and pleasant aesthetics for consumers, and it is non-toxic and cost-effective, and particularly can be used in home care compositions, personal care compositions and industrial cleaning compositions.

This invention relates to a monodisperse spherical micro / nano silica, its preparation method, and its applications. First, an aqueous sodium silicate solution is added to a crown ether aqueous solution, followed by the dropwise addition of sulfuric acid solution and stirring to initiate the reaction. Then, an organic extractant is added to extract the aqueous and organic phases. The aqueous phase is then mixed with an aqueous sulfuric acid solution and an alcohol solvent, respectively, to obtain two different solutions. These two solutions are then mixed and stirred, followed by centrifugation, washing, and drying to obtain the target product. The organic phase is subjected to vacuum distillation, water dissolution, and adsorption with an ion exchange resin to obtain a regenerated crown ether aqueous solution, which is then recycled. This invention adjusts the ionic strength of the reaction system by adding an organic complexing agent, precisely controlling the particle size of SiO2 particles to 20-1300 nm. This results in particles with uniform size, high sphericity, and good dispersibility. The entire preparation process has advantages such as simple technology, low cost, high yield, and ease of large-scale industrial production, showing promising application prospects in aerospace, biomedicine, and electronic packaging fields.

A method for producing organic microelement complexes based on humic acid salts is characterized in that an aqueous solution of lignosulfonate is mixed with dry or aqueous solutions of copper, zinc, manganese, iron, cobalt, ammonium molybdate sulfates, boric acid or potassium metaborate to achieve a total mass concentration of microelement ions in the range of 0.5-4.0% of the absolutely dry matter. An alkaline agent is added. The resulting working solution undergoes intensive mixing with cavitation treatment. The solution is loaded into a reactor, sealed, pressurized to 22 bar, and heated to 150°C. The synthesis of microelement complexes based on humic acid salts occurs for 120-150 minutes at a pressure of 22-23 bar, temperature of +170-180°C with an air flow rate of 60-80 1 / h passing through the reactor. The synthesis process is stopped when the pH drops below 8.5 by turning off the heating and air supply. The finished product is unloaded after natural cooling below 70°C. The invention enhances the stability of organic complexes based on humic acids with high concentrations of retained biogenic microelements.

The invention discloses a method for treating heavy metal lead-organic complex wastewater. According to the method, wet carbon felt is used as a working electrode to carry out electrochemical reduction treatment on the heavy metal lead-organic complex wastewater. According to the method, the mass transfer efficiency of the carbon felt and the selectivity to the heavy metal lead can be effectively improved by adopting the wet carbon felt, so that when the wet carbon felt is used as a working electrode to carry out electrochemical reduction treatment on the heavy metal lead-organic complex wastewater, not only can the heavy metal lead in the wastewater be efficiently removed, but also high-quality elemental lead can be obtained; in addition, the method for treating the heavy metal lead-organic complex wastewater has the advantages of simple process, convenience in operation, low cost and the like, and is of great significance in efficiently treating the wastewater containing the heavy metal lead-organic complex and realizing high-value recovery of lead in the wastewater.

The present application belongs to the technical field of resource recycling, and discloses a method for resource utilization of pickling wastewater. First, the nitric acid and hydrofluoric acid pickling solution of titanium material is filtered to remove insoluble solids as raw water, and an organic complexing agent is added to complex fluoride ions. Then, CaO is added to the solution to adjust the pH, and after filtration, a filtrate and a titanium-rich precipitate are obtained. H2O2 / Fe is added to the filtrate to oxidize and break the complex, and then CaO is added to adjust the pH. After filtration, a filtrate and a fluorine-rich precipitate are obtained. A composite adsorbent is added to the filtrate for deep defluorination, and after filtration, the solution is concentrated by high-salt reverse osmosis to obtain a 15-18 wt.% calcium nitrate solution. Ammonium calcium nitrate is added to supplement nitric acid and ammonia water, and finally the solution is evaporated to obtain a solid ammonium calcium nitrate product. Concentrated liquid can also be obtained, which can be directly used for drip irrigation. The method can effectively utilize the titanium material pickling solution resources, and has great economic and environmental benefits.

The application discloses a gradient-loaded oil hydrogenation dearsenification catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing stable dispersion impregnation component A-1 by mixing organic complexing agent I, hole expansion aid II, active component IV containing group ⅥB metal and deionized water; preparing stable dispersion impregnation component A-2 by mixing organic complexing agent I, hole expansion aid III and deionized water; dissolving component X1 containing group Ⅷ metal in the stable dispersion impregnation component A-1 to form stable complex impregnation liquid B-1; dissolving component X2 containing group Ⅷ metal in the stable dispersion impregnation component A-2 to form stable complex impregnation liquid B-2; impregnating porous carrier Z with the stable complex impregnation liquid B-1 to obtain catalyst C1; impregnating the catalyst C1 with the stable complex impregnation liquid B-2 to obtain catalyst C2; dissolving organic aid V and hole expansion aid VI in deionized water, and then impregnating the catalyst C2 to obtain the hydrogenation dearsenification catalyst C3. The preparation method can increase arsenic poisoning sites of the catalyst.

The utility model provides an ozonation separation treatment device for iron-containing organic complex wastewater, which relates to the field of wastewater ozonation equipment, and comprises a catalytic ozonation assembly, the catalytic ozonation assembly comprises an oxidation reaction tower and an ozone generator, the ozone generator is used for generating ozone, and the oxidation reaction tower is used for generating ozone. The oxidation reaction tower is used for providing catalytic reaction, a separation assembly is mounted on one side of the ozone catalytic oxidation assembly, and the separation assembly comprises a tank body, a conical hopper, a filter plate, a blow-off pipe, a blow-off valve, an overflow pipe and a liquid inlet pipe; under the joint cooperation of the ozone catalytic oxidation assembly, the separation assembly and the stirring assembly, not only can the ozone catalytic oxidation reaction be effectively carried out, but also particulate matters in the wastewater can be efficiently separated and discharged, so that the problem of residual particulate matters in the wastewater subjected to ozone catalytic oxidation treatment is effectively solved; the overall treatment efficiency is improved, and the normal operation of subsequent treatment equipment is protected.

The invention discloses a method for upgrading and regenerating a specifically repaired waste lithium iron phosphate battery. The method comprises the following steps: (1) dissolving waste lithium iron phosphate powder in water to prepare a solution A; (2) dissolving a lithium source and a multifunctional targeting complexing agent in water to prepare a solution B, wherein the multifunctional targeting complexing agent is selected from one or more of an organic complexing agent or organic phosphonic acid; (3) gradually dropwise adding the solution B into the solution A, then adding a buffer carbon source, and heating until the solvent is evaporated to dryness to obtain a regenerated precursor; and (4) calcining the regenerated precursor to obtain the regenerated lithium iron phosphate material. According to the method, targeted adsorption of Li < + > to a lithium-poor phase can be accurately controlled, the regeneration steps are greatly shortened, the energy consumption in the regeneration process is reduced, and the electrochemical performance of a lithium iron phosphate product is improved.

This invention belongs to the field of soil conditioner technology, and relates to an organic-inorganic coupled conditioner for improving soda saline-alkali land and its preparation method. The inorganic particles are composed of a mixture of activated polyaluminum ferric sulfate, activated zeolite powder, transcrystalline gypsum, trace elements, and reinforcing agents. The organic slurry is homogenized from activated humic acid extract, modified lignin sulfonate, functional biochar complex, and polyglutamic acid concentrate, and then subjected to spray granulation and high-temperature, high-humidity aging to achieve chemical cross-linking at the organic-inorganic interface, forming a stable three-dimensional network structure. The resulting conditioner integrates chemical exchange, physical adsorption, organic complexation, and biostimulation, and can rapidly reduce soil pH and alkalinity, improve soil aggregate structure, enhance nutrient retention capacity, and has a long-lasting effect and is environmentally friendly, making it suitable for the comprehensive management of soda saline-alkali land.

Disclosed is an organic-inorganic composite thermal insulation medium, which is a nanoparticle having a structure of (Mx-Rn)WOy, where M represents a doped metal element, R represents an organic complex group, 0.3≤x≤0.7, 2<y<4, n represents a polymerization degree of the organic complex group, and n≥10; M is selected from the group consisting of an alkali metal, an alkaline earth metal, a transition metal, and a rare earth metal; and R is selected from the group consisting of pyrrole and a derivative thereof, aniline and a derivative thereof, and thiophene and a derivative thereof. In addition, also disclosed is a method for preparing the thermal insulation medium.

This invention discloses a graded purification method for wet-process phosphoric acid, relating to the field of phosphoric acid chemical industry. The method includes the following steps: S100, adding an inorganic precipitant to wet-process phosphoric acid to carry out a main precipitation reaction; S200, adding active seed crystals to the material obtained in step S100 to carry out a seed-induced interface activation reaction; S300, adding an organic complexing agent to the material obtained in step S200 to carry out a complexation reaction; S400, adding a flocculant to the material obtained in step S300, and obtaining purified phosphoric acid through solid-liquid separation; wherein the inorganic precipitant is a diatomaceous earth-based composite precipitant modified with phytic acid and ionic liquid; and the organic complexing agent is a mixture of dithiophosphate compounds and hydroxyquinoline compounds. This invention achieves a removal rate of over 85% for major impurities such as iron, aluminum, and magnesium, and a removal rate of over 95% for trace heavy metals such as arsenic, cadmium, and lead, with a phosphorus yield of over 96.5%, by constructing a four-stage synergistic system of main precipitation-seed activation-deep complexation-flocculation enhancement.

This invention discloses a method for preparing a catalyst for ultra-fast high-salt wastewater purification assisted by trace amounts of H2O2, belonging to the field of wastewater degradation catalyst preparation technology. The method includes the following steps: dispersing biomass silkworm excrement in deionized water, adding soluble copper salt, and stirring thoroughly to dissolve to obtain suspension A; adding tannic acid to suspension A, and stirring thoroughly to dissolve to obtain suspension B; adding urea to suspension B, stirring thoroughly to dissolve, evaporating the solvent, drying, and grinding to obtain an intermediate product; calcining the intermediate product in flowing nitrogen gas, and grinding again to obtain the final product. This invention uses a two-step synthesis method involving organic complexation reaction and calcination to prepare a catalyst with excellent catalytic degradation performance for organic pollutants in water, exhibiting high catalytic degradation capacity and extremely high salt tolerance.