30 results about "Potassium ferrate" patented technology

The utility model relates to the technical field of water treatment equipment, and particularly discloses a potassium ferrate powder uniform feeding device which comprises a chemical feeding hopper, a detachable upper cover is arranged at the upper end of the chemical feeding hopper, a chemical feeding port and a first motor are arranged at the top of the upper cover, a first sealing cover is arranged on the chemical feeding port, and a second sealing cover is arranged on the first sealing cover. A stirring shaft located in the dosing hopper is connected to an output shaft of the first motor, a stirring rod is arranged on the side wall of the stirring shaft, a screen fixed to the dosing hopper is arranged below the stirring rod, a mounting cavity and a discharging channel communicated with the interior of the dosing hopper are arranged at the bottom of the dosing hopper, and a second motor and a vibration motor are arranged in the mounting cavity. A chemical feeding wheel is arranged in the discharging channel, an output shaft of the second motor is connected with the chemical feeding wheel, and a plurality of chemical grooves for containing potassium ferrate powder are evenly formed in the side wall of the chemical feeding wheel; according to the potassium ferrate powder adding device, quantitative and uniform adding of potassium ferrate powder is achieved, and the situation that all the potassium ferrate powder is directly scattered into sewage at a time, and consequently chemical waste is caused is avoided.

The invention discloses a potassium ferrate bottom-oriented enrichment slow-release agent and a preparation method and application thereof, and belongs to the technical field of bottom-oriented enrichment slow-release agents, and the preparation method comprises the following steps: S1, adding polyethylene glycol into water glass, dissolving, adding lithium hydroxide, acidifying, aging, washing, drying, grinding and calcining to obtain a modified carrier; s2, adding a potassium hydroxide solid into the hypochlorous acid solution, adding ferric hydroxide, continuously adding the potassium hydroxide solid, stirring at constant temperature, reacting to obtain a black purple solution, cooling, filtering and drying to obtain a potassium ferrate crude product; s3, adding the potassium ferrate crude product in the S2 into a 3M potassium hydroxide solution for dissolving, adding the modified carrier in the S1, stirring under an ultrasonic condition, then adding a potassium hydroxide solid to be saturated, keeping the temperature, standing, carrying out suction filtration, cleaning a filter cake, and drying to obtain a composite material; s4, grinding and sieving the composite material obtained in S3, mixing with a bottom enrichment agent, and tabletting to obtain a potassium ferrate bottom enrichment slow-release agent; the pond substrate can be improved.

The invention provides a method for removing total DNA (Deoxyribose Nucleic Acid) in wastewater with halide ion tolerance, which is used for removing DNA in wastewater containing halide ions based on a potassium ferrate and calcium sulfite coupling system, and belongs to the technical field of sewage purification treatment. The method provided by the invention utilizes Fe (IV) / Fe (V) / Fe (VI) and flocculent precipitate which are not interfered by halide ions in the reaction of potassium ferrate and slightly soluble calcium sulfite to realize efficient removal of DNA in wastewater. According to the method, the oxidation stability under halide ion interference is remarkably improved, better environmental adaptability and more stable removal efficiency are shown, and a new technical scheme is provided for treatment of actual wastewater containing resistance genes.

The invention belongs to the technical field of water treatment and disinfection, and particularly relates to a chlorine dioxide releasing agent with low corrosivity and a flocculation function and a preparation method of the chlorine dioxide releasing agent. The chlorine dioxide releasing agent is prepared from the following raw materials in percentage by mass: 8 to 12 percent of potassium ferrate, 16 to 22 percent of sodium chlorite, 15 to 23 percent of organic acid, 12 to 14 percent of ferric salt, 10 to 20 percent of peroxide donor, 6 to 12 percent of succinic acid and the balance of drying agent. The pH value of a solution activated by the chlorine dioxide releasing agent is close to neutral, and the problems that an existing chlorine dioxide releasing tablet is too low in pH and too strong in corrosion are solved; and moreover, the conversion rate of sodium chlorite and the purity of chlorine dioxide are effectively improved. In addition, the releasing agent also has dual effects of disinfection and flocculation of clear water, not only improves the disinfection efficiency, but also greatly reduces the production cost.

The invention discloses a method for removing COD (Chemical Oxygen Demand) in wastewater and application of the method. The method comprises the steps that a composite oxidizing agent A is added into the wastewater, a first stirring reaction is carried out, and effective components of the composite oxidizing agent A comprise sodium percarbonate and manganese dioxide; a composite oxidizing agent B is added into the reacted wastewater, a second stirring reaction is carried out, and effective components of the composite oxidizing agent B comprise potassium ferrate and hydrogen peroxide. The method realizes efficient treatment of high-concentration organic wastewater, and has both economical efficiency and operability.

The invention discloses an oilfield produced water treatment process which comprises the following steps: alternately adding an iron ion transforming agent component A and a powerful component B into oilfield sewage subjected to oil removal and desulfurization treatment; then, adding a universal component C; wherein the iron ion transforming agent component A is one or any combination of potassium permanganate, hydrogen peroxide, bleaching powder, ClO2, chlorine, potassium ferrate, sodium hypochlorite and MnO2; the powerful component B is one or any combination of amino carboxylic acid salts and amino / hydroxyl phosphonic acid salts; and the general component C is one or any combination of hydroxycarboxylic acid or poly (phenol, enol) hydroxyl salts. The invention further discloses the combined reagent for treating the oilfield produced water and application of the combined reagent. The method provided by the invention has an obvious iron ion removal effect.

The application discloses a method for removing trace thallium in wastewater by using a high ferrate system reinforced by iron-modified graphene nanobiocarbon, and belongs to the technical field of wastewater treatment. The method comprises the following steps: modifying biocarbon with iron to obtain iron-modified nanobiocarbon, loading graphene on the iron-modified nanobiocarbon, confining and doping iron particles in graphene nanometer, and obtaining iron-modified graphene nanobiocarbon. The application firstly confines and dopes iron particles in graphene nanometer, constructs a multifunctional material with high adsorption capacity and multiple active sites, and couples a potassium ferrate process to construct an adsorption-oxidation synergistic thallium removal system.

This invention belongs to the field of water treatment and disinfection technology, specifically relating to a chlorine dioxide releasing agent with both low corrosivity and flocculation functions, and its preparation method. The chlorine dioxide releasing agent is composed of the following raw materials in the indicated mass percentages: potassium ferrate 8-12%, sodium chlorite 16-22%, organic acid 15-23%, iron salt 12-14%, peroxide donor 10-20%, succinic acid 6-12%, with the balance being a desiccant. The activated solution of the chlorine dioxide releasing agent obtained by this invention has a near-neutral pH value, solving the problem of excessively low pH and strong corrosion in existing chlorine dioxide releasing tablets; it also effectively improves the conversion rate of sodium chlorite and the purity of chlorine dioxide. Furthermore, this releasing agent has dual functions of disinfection and flocculation of clean water, not only improving disinfection efficiency but also significantly reducing production costs.

The invention provides a culture method and device of anaerobic ammonia oxidation sludge particles and application, and belongs to the technical field of anaerobic ammonia oxidation. Iron-rich activated carbon is used as a carrier, sludge is inoculated, and a nutrient solution is added for sludge granulation culture; the preparation method of the iron-rich activated carbon comprises the following steps: impregnating biochar with a potassium ferrate solution, and drying to obtain potassium ferrate modified biochar; calcining the potassium ferrate modified charcoal in an anaerobic environment to obtain iron-rich activated carbon; the sludge contains microbial flora of Bacteroidota, Planctomycin and Chloroflexi, and the microbial flora of Bacteroidota, Planctomycin and Chloroflexi is used as a raw material. According to the present invention, iron-rich active carbon is adopted as a carrier, AL-2 and c-di-GMP bi-component quorum sensing signal molecules secreted by flora and other EPS with high protein content ratio are adopted, and Chloroflexi filamentous structure and gliding movement ability are adopted to promote the copolymerization of the three bacteria, such that the granulation of the anaerobic ammonium oxidation bacteria important family member Planctomycin is promoted.

The present application relates to a kind of oil-removing denitrification phosphorus-removing agent for treating domestic sewage and its preparation, method for using, phosphorus-removing agent is prepared from the following weight parts of raw materials: 15-29 parts of dodecyl imidazoline, 18-35 parts of sodium alginate, 10-30 parts of coconut shell powder, 20-40 parts of potassium ferrate, 15-45 parts of microcrystalline cellulose.The composite phosphorus-removing agent can not only remove oil, denitrification and phosphorus, but also the consumption of reagent is only 1 / 4 of conventional phosphorus-removing agent, when using, a certain amount of iron-containing aluminate waste water is introduced into domestic sewage and mixed according to proportion, and the sedimentation tank process is changed into flotation process, then the composite phosphorus-removing agent is added, and the suspended substance in water is used to collect iron-aluminum phosphorus compound, after such modification, various harmful substances in water quality are removed, and the consumption of phosphorus-removing agent is also greatly reduced.

The invention relates to the technical field of surface functional coatings, in particular to plasma electrolytic oxidation liquid and a preparation method thereof, and a titanium alloy fastener surface oxide ceramic coating and a preparation method thereof. The invention provides plasma electrolytic oxidation liquid. The plasma electrolytic oxidation liquid comprises a film-forming agent, a coloring agent, a bath solution stabilizer, a coloring auxiliary agent and water, the film-forming agent comprises one or more of sodium pyrophosphate, sodium polyphosphate and sodium perphosphate; the coloring agent comprises one or more of dicobalt oxalate tetraacetate, copper tetramine sulfate, titanium potassium oxalate and potassium ferrate; the bath solution stabilizer comprises one or more of disodium ethylenediaminetetraacetate, sodium tetraborate, sodium potassium tartrate tetrahydrate and sodium citrate; the coloring auxiliary agent comprises one or more of sodium silicate, sodium tungstate and sodium molybdate. The plasma electrolytic oxidation liquid can ensure that a surface coating with good blackness is obtained on the surface of a titanium alloy fastener within a short time.

This invention discloses an iron-based multimetallic catalytic material, its preparation method, and its application, belonging to the field of catalyst preparation technology. The preparation method includes: dissolving two or more water-soluble metal salts with different hydroxide solubility products in water to obtain a mixed solution A; dissolving potassium ferrate in cold water to obtain solution B; pouring solution B into mixed solution A under stirring to obtain mixed solution C; allowing the solution to settle at low temperature until the supernatant changes color from dark purple to light purple and reaches neutral pH, then filtering, washing, and drying to obtain a precursor; calcining the precursor in a mixed atmosphere of hydrogen and argon to obtain the iron-based multimetallic catalytic material. This material has a multi-layered enclosed microstructure, with metal oxides of high hydroxide solubility products located on the periphery and those of low solubility products located inside, achieving a gradient arrangement and synergistic effect of metal components. The process of this invention is simple and the conditions are mild. The obtained catalyst exhibits high catalytic activity, high selectivity, and excellent stability in the countercurrent water-gas reaction.

The invention provides a carrier for enriching anaerobic ammonium oxidation bacteria as well as a preparation method and application of the carrier, and belongs to the technical field of anaerobic ammonium oxidation materials. The invention provides a preparation method of a carrier for anaerobic ammonium oxidation bacteria enrichment, which comprises the following steps: impregnating biochar with a potassium ferrate solution, and drying to obtain potassium ferrate modified biochar; calcining the potassium ferrate modified charcoal in an anaerobic environment to obtain an anaerobic ammonium oxidation bacterium enrichment carrier; the dipping comprises soaking, intermittent stirring and continuous stirring which are performed in sequence. The preparation method comprises the following steps: loading various forms of iron generated by potassium ferrate in water on a biochar material to obtain a composite material, and calcining the composite material at high temperature to obtain a carrier product. The carrier is long in service life, can realize continuous release of iron, promotes formation of anaerobic ammonium oxidation bacteria biological membranes, not only contributes to rapid enrichment culture of anaerobic ammonium oxidation bacteria, but also can be continued to anaerobic ammonium oxidation bacteria engineering application.

The invention discloses an iron-based multi-metal catalytic material as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: dissolving more than two metal water-soluble salts with different hydroxide solubility products in water to obtain a mixed solution A; dissolving potassium ferrate in cold water to obtain a solution B; pouring the solution B into the mixed solution A while stirring to obtain a mixed solution C; after the color of the supernate becomes light purple from dark purple and the pH is neutral, suction filtration, washing and drying are performed, and a precursor is obtained; and calcining in a mixed atmosphere of hydrogen and argon to obtain the iron-based multi-metal catalytic material. The material is of a multi-layer surrounding type microstructure, metal oxides with high hydroxide solubility products are located on the periphery, metal oxides with low hydroxide solubility products are located inside, and gradient arrangement and synergistic effect of metal components are achieved. The method is simple in process and mild in condition, and the obtained catalyst shows high catalytic activity, high selectivity and excellent stability in the reverse water gas reaction.

The application discloses a kind of photovoltaic industry high concentration slice wastewater pretreatment method, comprising the following working steps: step S1, in slice wastewater, add alkaline substance, react 30min;The alkaline substance is selected from one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and alkaline substance dosing concentration is 1000~5000mg / L;Step S2, the slice wastewater after processing in step S1 is heated to 38~45 ℃, so that polyether compound is converted from dissolved state to insoluble state and precipitates;Step S3, in the slice wastewater after processing in step S2, add high ferric acid salt, react 30min;The high ferric acid salt is sodium ferrite or potassium ferrite, and the high ferric acid salt dosing concentration is 50~400mg / L.The application can reduce the temperature required for polyether compound thermal destabilization in slice wastewater, save wastewater treatment operation energy consumption, also can avoid when slice wastewater temperature reduces again dissolved state polyether compound, increase the actual removal rate of polyether compound.

The application discloses a preparation method of microporous high-graphitization odor-removing powder carbon, and belongs to the technical field of activated carbon materials. The method uses anthracite as raw material, carries out desalination through hydrochloric acid and hydrofluoric acid, carries out pretreatment through modification of trimethyl orthophenyl phosphate and titanium acid tetraisobutyl ester, soaks in a potassium ferrate solution, and finally obtains activated carbon with high micropore volume and high graphitization degree through carbonization and steam activation under nitrogen protection. Potassium ferrate acts as a catalyst, and simultaneously promotes the potassium hydroxide activation reaction and the iron-based graphitization process. The method is simple and low in cost, the obtained material has excellent adsorption and stability, significantly improves the adsorption capacity of 2-methyl isoborneol and geosmin, and is suitable for efficient removal of odor substances in drinking water sources.

The invention discloses magnetic mushroom dreg biochar as well as a preparation method and application thereof, and belongs to the technical field of water treatment. Mushroom residue biochar BC is prepared from shiitake mushroom residues, then the mushroom residue biochar and potassium ferrate K2FeO4 are subjected to ball milling, sufficient stirring, porphyrizing and mixing and then subjected to high-temperature firing, the magnetic mushroom residue biochar MBC composite material is obtained and used for removing diazepam in aquaculture water, and experimental results show that the magnetic mushroom residue biochar MBC composite material can be used for removing diazepam in aquaculture water at the temperature of 20-40 DEG C, so that the magnetic mushroom residue biochar MBC composite material can be used for removing diazepam in aquaculture water. When the pH value is 6-8, the adsorption capacity of the magnetic mushroom dreg biochar MBC on diazepam in water is 32.00 mg / g or above, and the magnetic mushroom dreg biochar MBC shows a good removal effect. The biochar material prepared by the invention is easy to recover under the action of an external magnetic field, is a novel diazepam water pollution purification material which is green, environment-friendly and energy-saving, and meets the requirements of quickly and powerfully guaranteeing the quality safety of aquatic products.

The application relates to the technical field of water and soil pollution control, and discloses an iron-nitrogen co-doped biochar for Cd-As composite pollution remediation, a preparation method and application, which comprises the following raw materials: biomass material, potassium ferrate and melamine. The iron-nitrogen co-doped biochar can realize the synergistic and efficient removal of Cd(II) and As(III), and the adsorption capacity of the biochar for As(III) in a Cd-As composite pollution system reaches 28.96 mg / g, which is 5.18 times higher than that in a single As(III) pollution system.

This invention belongs to the field of inorganic nanomaterial synthesis technology, and discloses a Fe-doped δ-MnO2 nanoparticle and its preparation method. The method involves uniformly mixing potassium ferrate and manganese salt, calcining at 200–600°C for a high-temperature solid-state reaction, and after the reaction is complete, washing and drying the resulting product to obtain Fe-doped δ-MnO2. This invention utilizes FeO4 in potassium ferrate. 2‑ The strong oxidizing properties of manganese salts will cause Mn to form in the manganese salt. 2+ Potassium ferrate is oxidized to MnO2, and the potassium in it... + Sufficient counter cations can be provided to the interlayer of δ-MnO2 to stabilize its layered structure. Furthermore, FeO4... 2‑ Mn 2+ Reduced to Fe 3+ Afterwards, some Fe 3+ Fe-doped δ-MnO2 nanoparticles are obtained by entering the δ-MnO2 lattice through a solid-state reaction. This preparation method is simple, controllable, and reproducible, and the raw materials are all solid powders, making it easy to achieve large-scale industrial production.

The application discloses a method for removing aspergillus niger spores by synergistically strengthening ultraviolet auxiliary micro-current catalysis potassium ferrate and ozone water, and relates to a method for removing aspergillus niger spores. The application is a technology for enhancing the sterilization effect by combining micro-current catalysis activation of potassium ferrate with ozone water and utilizing ultraviolet irradiation. The method aims to solve the problems of insufficient killing efficiency of existing sterilization technologies on high-resistance spores and high risk of sterilization by-products. The specific steps include: adding potassium ferrate into water containing aspergillus niger spores; micro-current catalysis, and disconnecting the current after the catalysis is completed; introducing ozone into the catalyzed water, and then performing ultraviolet irradiation to enhance the sterilization activity and effectively improve the killing rate of aspergillus niger spores. The application can realize a killing rate of aspergillus niger spores of more than 98.3%, significantly reduce the generation of sterilization by-products, and has the advantages of simple operation, environmental protection and safety.

The application discloses a carbon quantum dot reinforced high-valence metal oxidation water treatment method, and belongs to the technical field of water treatment. The method comprises the following steps: adding carbon quantum dot solution and potassium permanganate or potassium ferrate into polluted water to be treated in sequence, and treating under stirring for 10-60 minutes, so as to complete the treatment. The application has excellent oxidation efficiency and fast reaction rate, and has excellent pollutant removal effect in the pH 4-8 range. The application also has good efficiency under complex water quality, and is beneficial to application in actual engineering. In the potassium ferrate / carbon quantum dot system, the removal effect of organic pollutants is improved by 10-40%, and the oxidation reaction rate is improved by 1.1-22.8 times. In the potassium permanganate / carbon quantum dot system, the removal effect of organic pollutants is improved by 0.1-6.4 times, the electron transfer efficiency is improved, the utilization efficiency of the oxidant is improved, and the pollutant degradation effect is improved. The application is suitable for water treatment.

The invention belongs to the technical field of semiconductor material polishing, and provides a two-component polishing solution and a preparation method thereof.The preparation method comprises the steps that silica sol is pretreated through an initiator, pretreated silica sol is obtained, then a poly (acrylic acid-acrylamide) copolymer is grafted to the surface of the pretreated silica sol, and a modified abrasive is obtained; the preparation method comprises the following steps: modifying a polyacrylic acid dispersing agent by using a phosphate monomer to obtain a first dispersing agent, and reacting an amino monomer with the phosphate monomer to obtain a second dispersing agent; the modified abrasive, the first dispersing agent and water are mixed to obtain a component A, and the oxidizing agent, the pH adjusting agent, the second dispersing agent and water are mixed to obtain a component B. The bi-component polishing solution prepared by the method can effectively avoid the influence of ferric ions generated in the potassium ferrate oxidation process on the polishing solution, and the polishing quality is improved.

The application discloses a magnesium alloy surface coloring treatment agent and a preparation method thereof, and belongs to the technical field of magnesium alloy surface treatment, wherein the coloring treatment agent comprises the following raw materials in parts by weight: zirconium citrate 30-50 parts, potassium titanium oxalate 20-30 parts, potassium ferrate 10-30 parts, citric acid 10-20 parts, oxalic acid 10-20 parts, nano sol 5-15 parts, disodium ethylenediaminetetraacetate 3-8 parts, antimony nitrate 2-20 parts, cobalt nitrate 1-10 parts, coloring salt 1-10 parts, composite corrosion inhibitor 1-5 parts, dispersing agent 1-5 parts, and water 1000 parts. The coating formed on the surface of the magnesium alloy by the coloring treatment agent prepared by the application has the advantage of controllable color, meets the color requirements of customers in different scenes, and meanwhile, the coloring treatment agent has excellent corrosion resistance, wear resistance, bonding force and other performances.

The invention relates to the technical field of gas purification materials, and discloses a preparation method of potassium permanganate ethylene absorption particles, which comprises the following steps: mixing clinoptilolite powder, calcium bentonite and other silicon-aluminum raw materials to obtain mixed powder; preparing a composite activator-oxidant precursor solution containing potassium hydroxide, potassium silicate, potassium permanganate and potassium ferrate; kneading the precursor solution and the mixed powder, and performing extrusion granulation; and carrying out moist heat curing on the obtained wet particles under the conditions that the temperature is 60-80 DEG C and the relative humidity is 85-95%, and finally drying. According to the invention, a three-dimensional network skeleton for chemically bonding the components is constructed in the particles through an in-situ inorganic polymerization reaction, and stable solid solution of double oxidants is realized. The particles prepared by the method have high mechanical strength, long service life and high ethylene absorption capacity.

The invention relates to a modified lepidolite slag roadbed filler and a preparation method thereof, and belongs to the technical field of roadbed engineering. The modified lepidolite slag roadbed filler comprises the following components in parts by weight: 74-80 parts of lepidolite slag, 0.8-1.2 parts of potassium ferrate powder, 1.5-2 parts of lime, 1.2-1.8 parts of a composite modified adsorption material, 1.5-3 parts of blast furnace slag powder and 14-18 parts of water. According to the modification principle, the utilization requirement of harmless engineering is met by utilizing the complementary chemical characteristic of materials such as the lepidolite slag and the inorganic modifier, so that the lepidolite slag is used for roadbed filling engineering, and the preparation process can effectively solve the problems that heat is rapidly released due to the lime hydration reaction and the volcanic ash reaction, the temperature is sharply increased and the construction cost is reduced. Therefore, the condition that the curing effect of the lepidolite slag roadbed filler is reduced is avoided. Through a unique material formula and a preparation process, the lepidolite slag is converted into a green and harmless roadbed material with stable pavement performance, and the roadbed material is used for road engineering construction.

This invention provides a method for improving the enzymatic hydrolysis efficiency of corn straw using a potassium ferrate composite solution, comprising the following steps: providing a potassium ferrate composite solution, wherein Fe... 6+ The molar concentration was 40.2 mmol / L, ClO ‑ The molar concentration was 704.5 mmol / L, OH ‑ The molar concentration was 2500.1 mmol / L. Corn stalk powder was selected, and its solid-liquid ratio with the potassium ferrate composite solution was 10%. After mixing, the mixture was subjected to isothermal shaking treatment at a temperature of 4-85℃ for 3-48 hours. This invention provides a method for improving the enzymatic hydrolysis efficiency of corn stalks using a potassium ferrate composite solution. This method not only reuses the potassium ferrate composite solution but also disrupts the surface structure of the stalks, removing lignin and some hemicellulose, thus exposing more cellulose and improving the enzymatic hydrolysis efficiency.

Disclosed is an impurity removal and modification method for pyrolysis carbon black of waste tires, the method comprising: dispersing pyrolysis carbon black of waste tires in an alkali solution of potassium ferrate; adding hypohalite; leaving to stand for layering; and performing centrifugation and washing on a lower-layer slurry to obtain a stably dispersed pyrolysis carbon black / water suspension. This modification method can be operated simply and easily; and by means of the method, ash in pyrolysis carbon black of waste tires can be effectively removed, and the pyrolysis carbon black is then stably dispersed in water. In addition, the modification method is low in production cost, and is green and environmentally friendly, and a waste liquid thereof can be recycled.

The invention discloses a method for repairing soil polluted by imidacloprid pesticide based on mechanochemistry, which is characterized in that potassium ferrate and calcium oxide are used as ball milling reagents to carry out ball milling on the soil polluted by the imidacloprid pesticide. According to the method for repairing the soil polluted by the imidacloprid pesticide based on mechanochemistry, potassium ferrate serves as a main grinding agent, calcium oxide serves as a grinding aid, the calcium oxide is induced to generate oxygen vacancies and free electrons through the mechanical force effect of a ball mill, the potassium ferrate is activated through the generated free electrons, more high-activity species are released by the potassium ferrate, and the soil polluted by the imidacloprid pesticide is restored. Under the synergistic effect of active species and free electrons, imidacloprid molecules can be attacked together, so that the imidacloprid molecular structure is destroyed and decomposed, effective remediation of the soil polluted by the imidacloprid pesticide can be achieved, the remediation effect on the soil polluted by the imidacloprid pesticide reaches up to 96%, and the method has the advantages of being low in cost, good in remediation effect, green, environmentally friendly and the like and has broad application prospects. And meanwhile, under the same repairing effect, the energy consumption is lower, the use value is high, and the application prospect is good.

Provided are a preparation method of a magnetic adsorption material and a method for treating heavy metal wastewater, comprising: adding an alkaline alcohol solution of potassium ferrate into nickel-containing electroplating wastewater, mixing, then adding acid or alkali to adjust the pH of the mixed solution to 10-12, reacting to form a precipitate, aging, filtering, washing, drying, and calcining to obtain the magnetic adsorption material. The magnetic adsorption material has a high separation and recovery rate for metal adsorption and separation in heavy metal wastewater. The present application effectively controls the hydrolysis degree of potassium ferrate in water by controlling the solution ratio and concentration of the alkaline alcohol solution of potassium ferrate, successfully destroys the complex state of nickel in nickel plating wastewater, and is beneficial to the recovery of nickel. The nickel in the nickel-containing electroplating wastewater is used as a raw material, the nickel ions in the wastewater are reused, the recovery rate of nickel is high, the cost of wastewater treatment is saved, and the heavy metals in the wastewater have a good adsorption effect.

The invention discloses a potassium ferrate preparation process, and belongs to the field of potassium ferrate synthesis, the potassium ferrate preparation process comprises the following steps: S1, slowly dropwise adding sulfuric acid into hydrogen peroxide and a hydrogen peroxide stabilizer at-5-5 DEG C, stirring while dropwise adding, and reacting for a period of time to obtain an oxidation solution; and S2, at 0-10 DEG C, dropwise adding a ferrous sulfate solution and potassium hydroxide into the oxidation liquid obtained in the step S1 while stirring, stirring for a certain time, adding a potassium hydroxide solid to adjust the pH value, continuing to react, and carrying out suction filtration, recrystallization, washing and drying to obtain the potassium ferrate. Hydrogen peroxide and sulfuric acid can be used as raw materials, so that direct use of chlorine, pypocholoride and other dangerous reagents which are easy to introduce chlorine impurities is avoided.