272 results about "Potassium persulfate" patented technology

A fireproof magnesium oxide board is prepared by mixing the following raw materials, the raw material names and weight parts are as follows: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of glass magnesium board crushed powder; 1.5-5 parts of non-woven fabric; 10-20 parts of water; wherein the modified expanded vermiculite is prepared by the following steps: (1) Vermiculite is incompletely expanded and calcined; (2) acrylic acid monomer, sodium hydroxide, acrylamide monomer, initiator potassium persulfate, crosslinking aid pentaerythritol polyglycidyl ether, incompletely expanded vermiculite, and water are taken, stirred evenly and ultrasonically dispersed to obtain a first reaction solution, which is placed in a reactor for reaction to obtain a gel material; (3) the gel material is preliminarily crushed and dried, and then further crushed in a ball mill to obtain a fire-resistant expanded vermiculite with water absorption performance.

The invention discloses a biomass-inorganic-organic ternary composite flocculant and a preparation method and application thereof, and belongs to the field of coking wastewater treatment.The preparation method comprises the steps that chitosan serves as a substrate material, glutaraldehyde serves as a cross-linking agent, and polyferric sulfate (PFS) and chitosan are subjected to chemical cross-linking to generate an intermediate product PFS and chitosan composite particles; then potassium persulfate is used as an initiator, graft copolymerization of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride is initiated through hydroxyl on the surface of PFS-chitosan, a cationic branched chain is introduced, and a final product is obtained. Through multi-component cooperation and structural design, the defects that a traditional flocculating agent is not thorough in demulsification, large in sludge amount, unstable in floc combination and the like in coking wastewater treatment are overcome, and the flocculating agent is particularly suitable for treating oil pollutants in coking wastewater.

The invention discloses a super absorbent material and side leakage prevention paper diapers, and belongs to the field of hygienic product materials. Comprising the following steps: cooling acrylic acid in an ice-water bath, and partially neutralizing the acrylic acid by using a sodium hydroxide solution; mixing potato starch with deionized water, and gelatinizing at high temperature to obtain gelatinized starch; mixing gelatinized starch, neutralized acrylic acid, potassium persulfate and deionized water; uniformly stirring under the protection of nitrogen, heating and carrying out graft copolymerization reaction to obtain a copolymer; adding modified silicon dioxide into the copolymer, and uniformly dispersing; then adding an oxetane compound, and carrying out a cross-linking reaction at a high temperature to obtain a super absorbent material; wherein the modified silicon dioxide has a porous structure, and nano-silver particles are loaded in pore walls. The super absorbent material disclosed by the invention effectively breaks through the gel blocking effect of the traditional high-molecular water-absorbent resin, has ultrahigh liquid absorption capacity and water locking capacity, and realizes slow-release long-acting bacteriostasis at the same time.

The invention discloses a core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule, the microstructure is of a spherical structure, the core-shell structure is adopted, the core structure is hexadecane, the shell structure is a methyl methacrylate (MMA) and N, N-methylene bisacrylamide (MBA) copolymer, the emulsifier is lauryl sodium sulfate (SDS), the initiator is potassium persulfate, and the pH value of the core-shell structure P (MMA-MBA) copolymer heat-storage phase-change microcapsule is 7-8. And the coating efficiency is 70-75%. The preparation method comprises the following steps: 1, preparing an oil phase and a water phase; and 2, polymerization reaction of the microcapsule. A phase change cement material based on a core-shell structure P (MMA-MBA) copolymer heat storage phase change microcapsule is prepared by compounding the P (MMA-MBA) copolymer heat storage phase change microcapsule and a cement matrix, and has hydrophobicity; obvious weightlessness exists in two times.

The invention relates to high-strength degradable self-healing hydrogel and a preparation method thereof, and belongs to the technical field of high polymer materials. The hydrogel is prepared from the following components in percentage by mass: 15 to 20 percent of carboxymethyl cellulose, 10 to 14 percent of acrylic acid, 15 to 20 percent of N-isopropylacrylamide, 4 to 8 percent of tannic acid, 2 to 4 percent of borax, 0.06 to 0.1 percent of laccase, 0.5 to 1 percent of N, N-methylene bisacrylamide, 0.4 to 0.6 percent of potassium persulfate and the balance of phosphate buffer solution. According to the hydrogel disclosed by the invention, through dual-network structure design, dynamic covalent bond crosslinking and enzyme catalysis green synthesis, collaborative optimization of high strength, high self-healing property, degradability and multi-responsiveness is realized, and the problems of poor mechanical property, low repairing efficiency, environmental unfriendliness and the like of traditional hydrogel are solved; the method has wide application potential in the fields of biomedicine, flexible electronics, intelligent packaging and the like.

The application discloses a preparation method of urolithin A. The method uses urolithin B as a raw material, adopts potassium persulfate to perform Elbs oxidation under alkaline conditions, and obtains urolithin A. A reaction route is as follows: wherein, formula I is a chemical structural formula of urolithin B, and formula II is a chemical structural formula of urolithin A. The preparation method of urolithin A provided by the application effectively reduces a synthesis cost, avoids use of dangerous and toxic reagents, effectively reduces generation of industrial three wastes, and is simple in process, convenient in operation, low in raw material cost, high in yield, and beneficial to large-scale industrial production.

The invention discloses a silicon carbide substrate rough polishing composition and a preparation method and application thereof, and belongs to the technical field of semiconductor device processing. The rough polishing composition for the silicon carbide substrate is a polishing composition obtained by adjusting the pH value of a basic system to 3-4 by using a pH regulator; the basic system comprises the following components in percentage by mass: 2-10% of an abrasive, 2-6% of a first oxidant, 2-10% of a second oxidant and 0.5-2% of a dispersing agent besides water; the first oxidant is potassium permanganate; the second oxidizing agent is potassium persulfate or ferric persulfate. According to the method, the combination of potassium permanganate and persulfate is used as an oxidizing agent, and the rough polishing efficiency and uniformity of silicon carbide are remarkably improved through oxidation potential complementation, acidic environment synergy, free radical catalysis chain reaction and surface wettability optimization.

The invention relates to the field of industrial waste gas treatment, and discloses a technology for removing NOx and SOs in industrial flue gas through an ultrasonic atomization wet method. The technology comprises the steps that S1, the industrial flue gas is cooled and dedusted; s2, performing oxidation washing on NO by using a first washing solution and a second washing solution respectively; s3, absorbing NOx and SOs generated by oxidation of the industrial flue gas by using an absorption liquid subjected to ultrasonic atomization; s4, carrying out demisting treatment on the industrial flue gas; a first washing solution in the step S2 is a 0.5-1.5 wt% potassium persulfate aqueous solution, and a second washing solution is composed of 1-2wt% of ferrous sulfate, 0.5-1wt% of EDTA and the balance of water; the absorption liquid in the step S3 is prepared from basic hydroxide, carbonate, an interface modifier and water. According to the ultrasonic atomization wet process, the solid precipitation amount of the absorption liquid is small, the NOx and SOabsorptivity is high, and equipment cannot be corroded after long-term use.

The invention discloses a regenerated carbon aggregation medium as well as a preparation method and application thereof, and belongs to the technical field of organic matter recovery. The preparation method comprises the following steps: by taking a carbon aggregation medium enriched with organic matters as a matrix and hydrochloric acid or a hydroxide modifier, carrying out hydrothermal reaction in a stirring state, filtering, drying and grinding to obtain hydrothermal regenerated carbon; and adding water into the hydrothermal regenerated carbon, adjusting the pH value to 2-7, heating to 50-70 DEG C, adding potassium persulfate and a methacryloyloxyethyl trimethyl ammonium chloride solution in a protective atmosphere, and carrying out graft copolymerization reaction on the hydrothermal regenerated carbon and methacryloyloxyethyl trimethyl ammonium chloride under the initiation action of potassium persulfate to obtain the regenerated carbon aggregation medium. The grafting rate, grafting efficiency and charge density of the prepared regenerated carbon aggregation medium can reach 7.76%, 7.96% and 1.132 mmol / g respectively, and the removal rates of COD (Chemical Oxygen Demand) and turbidity are 62.81% and 88.87% respectively.

The application relates to a sensor for synchronously detecting enniatin and roquefortine based on a double-potential electrochemiluminescence immunoassay technology as well as a preparation method and a detection method thereof. The sensor comprises a base electrode, a sensing interface composed of a nanocomposite is modified on the surface of the base electrode, mixed coated antigens including ENNs-BSA and AOH-BSA fixed on the sensing interface, mixed probes including a cathode probe and an anode probe, the cathode probe is Zr-Por-MOF-ENNs Ab which is obtained by marking ENNs antibodies with a porphyrin zirconium metal organic framework, the anode probe is Ce-In-MOF@ABEI-AOH Ab which is obtained by marking AOH antibodies with ABEI loaded on a cerium-doped indium metal organic framework, and a detection solution containing a single co-reactant potassium persulfate. The application can realize one-time sample adding, double-potential scanning and synchronous quantification for two kinds of mycotoxins of enniatin and roquefortine.

The application discloses an ECL biosensor for detecting microcystin. Under the excitation of a photomultiplier tube, AuNC and a co-reactant, potassium persulfate (K2S2O8), directly react to generate AuNC •+ and SO4 •‑ , SO4 •‑ is reduced to SO4 •+ by AuNC 2‑ , and AuNC * is generated simultaneously, wherein AuNC * is an excited state of AuNC, and the excited state is transitioned to a ground state to release light intensity, which is captured by an ECL instrument to generate an ECL signal. With the increase of the content of MC-LR, the ECL signal is stronger, so that quantitative detection of the content of MC-LR is realized. The biosensor platform has a wide detection range from 0.1 pM to 1 nM, and the detection limit is as low as 62.3 fM. The application can realize rapid detection of low-concentration target microcystin MC-LR, and can be applied to detection in various samples, such as food, medicine, milk, beverage, water and the like.

This invention relates to a method for preparing a broadband absorption hydrogel. The method comprises the following steps: S1, mixing solvent A (N,N-dimethylformamide or acetonitrile) with deionized water to obtain a mixed solvent; S2, adding polyethylene glycol methyl ether acrylate-480 and acryloylmorpholine to the solvent in S1 and dissolving them to obtain a mixed solution; S3, removing dissolved oxygen from the mixed solution in S2, sealing the container, and stirring under ice bath conditions; S4, adding potassium persulfate and N,N,N',N'-tetramethylethylenediamine to the mixed solution after stirring in S3, and sealing the container again; S5, completing the polymerization reaction in the container at 60 °C to obtain the hydrogel. Compared with the prior art, the hydrogel material provided by this invention has improved reflection loss intensity and effective absorption bandwidth performance, thus providing a new perspective for developing highly flexible and efficient electromagnetic wave absorbers.

The invention belongs to the technical field of packaging materials. The invention relates to an adhesive, in particular to a PVA adhesive tape adhesive and a preparation method thereof. The preparation method comprises the following specific preparation steps: mixing guar gum and water according to a mass ratio of 1: (15-20) for swelling, adding endo-beta-glucanase accounting for 0.3-0.5% of the mass of the guar gum, carrying out ultrasonic enzymolysis reaction for 30-45 minutes under the conditions that the pH is 5.0-5.2, the temperature is 48-52 DEG C and the ultrasonic frequency is 50-60 kHz, heating for enzyme deactivation, and cooling to obtain an activated vegetable gum solution; uniformly stirring and mixing a PVA (Polyvinyl Alcohol) solution and the activated vegetable glue solution, adding a thickening agent solution, continuously stirring and mixing uniformly, adding a composite modifier and potassium persulfate, carrying out heat preservation curing reaction for 2-4 hours at the temperature of 40-45 DEG C, aging for 24-36 hours, and discharging to obtain a mixed glue solution; and coating the mixed adhesive solution, and drying to obtain the PVA adhesive tape adhesive.

Embodiments herein relate to recycling of used lithium battery materials. In some aspects, a method may include suspending a lithium source in a solvent containing an oxidizing agent to extract lithium, forming an extracted lithium solution, separating the extracted lithium solution from residual solids of the lithium source, purifying the extracted lithium solution by precipitating and filtering impurities, and precipitating lithium in the purified lithium solution to produce lithium carbonate (Li2CO3). In some embodiments, the method may also include pre-treating the lithium source to improve the kinetics of the lithium extraction. In some embodiments, the pretreatment may include a cutting or comminution step to reduce the size of the lithium source. In some embodiments, the lithium source may include lithium ion battery waste. In some embodiments, the oxidizing agent may include sodium persulfate (Na2S2O8), potassium persulfate ((NH4) 2S2O8), ammonium persulfate (NH4) 2S2O8, hydrogen peroxide (H2O2), ozone (O3), and / or nitrous oxide (N2O).

The invention discloses a self-repairing gel foam system and a preparation method thereof. The self-repairing gel foam system is composed of 0.3% of lauryl sodium sulfate, 3% of alpha-starch, 3% of acrylamide monomer, 0.1% of N, N '-methylene bisacrylamide cross-linking agent, 0.2% of potassium persulfate initiator and 0.002% of 30nm nano SiO2 particles modified by 0.05 wt% of fatty alcohol-polyoxyethylene ether. The preparation method comprises the following steps: enabling modified starch, acrylamide and the like to react to form starch gel, adding lauryl sodium sulfate and modified nano SiO2, and stirring to obtain the modified starch gel. Gel macromolecular aggregates in the system form a three-dimensional network structure, nanoparticles are uniformly dispersed on the surface of a liquid film to form a gas-liquid-solid three-phase skeleton, and a self-repairing function is realized through a hydrogen bond dynamic effect, so that bubble coalescence can be inhibited, and the capabilities of resisting hypersalinity, high temperature, gas condensate and methanol are enhanced; the problems that traditional foam is poor in stability and free of self-repairing capacity are solved, and the drainage gas recovery requirements of complex working conditions of western gas fields are met.

The invention belongs to the technical field of polyacrylamide synthesis, and particularly relates to a synthesis method of polyacrylamide for oil displacement. The synthesis method of the polyacrylamide for oil displacement, disclosed by the invention, comprises the following steps: (1) pre-emulsifying 1H, 1H, 2H, 2H-perfluorooctyl acrylate; (2) preparing a water phase; (3) preparing an organic phase solution; (4) polymerization reaction; and (5) post-treatment. According to the synthesis method of polyacrylamide for oil displacement, acrylamide is used as a main monomer, 3-allyloxy-2-hydroxy-1-propanesulfonic acid sodium salt, 1H, 1H, 2H, 2H-octyl perfluoroacrylate and 1-methacryloyloxy adamantane are used as functional monomers, a potassium persulfate solution-sodium hydrogen sulfite solution is used as an initiator system, and the polyacrylamide for oil displacement is synthesized through a one-step method. The polyacrylamide for oil displacement, which is prepared by adopting a water-phase micelle polymerization method, has temperature resistance, salt resistance and shear resistance.

This invention discloses a biodegradable polymeric flocculant and its application, specifically comprising the following steps: dissolving sulfonated starch in deionized water, adding chitosan composite powder, heating and stirring until dissolved, ultrasonically dispersing, adding acrylamide, then adding N,N'-methylenebisacrylamide and potassium persulfate, stirring until a gel is formed, cutting the gel into small pieces and immersing them in distilled water for washing, drying, pulverizing and sieving the washed gel to obtain the biodegradable polymeric flocculant; this invention improves flocculation and biodegradability by combining synthetic organic polymers and natural polymeric materials, and enhances antibacterial ability and degradation performance by combining silver oxide, titanium oxide and graphene oxide, exhibiting good flocculation and sedimentation ability, excellent biodegradability, and good antibacterial ability.

The application relates to the technical field of waste drilling fluid treatment, and discloses a modifier for treating water-based drilling waste and a preparation method thereof; according to weight parts, the raw materials of the modifier include 30-40 parts of potassium persulfate, 10-25 parts of ferric chloride, 20-40 parts of quaternary ammonium cation polymer and 10-20 parts of magnetized modified attapulgite clay. The modifier for treating water-based drilling waste provided in the application solves the problem of incomplete gel breaking in the water-based drilling waste treatment process through synergistic action of various components, forms an oxidation-catalysis-flocculation-magnetic separation four-stage synergistic treatment process, reduces the metal ion content in the liquid phase after solid-liquid separation, makes the liquid phase meet the drilling fluid water preparation requirement without further treatment, simplifies the treatment process and reduces the cost.

The invention discloses a method for enhancing compost humification synergistic gas emission reduction and tetracycline degradation through thermal activation peroxide, and relates to the technical field of compost. The method comprises the following steps: mixing livestock and poultry manure and 1-3cm crop straws according to a dry weight ratio of (1-3): 1, and adjusting the carbon-nitrogen ratio to (20-30): 1 to complete raw material pretreatment; when the temperature of the pile body is 25-35 DEG C, peroxide (hydrogen peroxide, peracetic acid or potassium persulfate) is sprayed and mixed uniformly in the form of an aqueous solution, the addition amount is 0.125-1.25% of the dry weight of the raw materials, the moisture content of the pile body is controlled to be 55-75%, and continuous or intermittent ventilation composting is carried out at the speed of 0.2-1.0 m < 3 > h <-1 >. According to the method, the peroxide is activated by utilizing self-produced heat of compost, external energy sources and chemical activators are not needed, triple effects of compost humification improvement, ammonia gas and greenhouse gas emission reduction and tetracycline degradation are realized, and the method is green, environment-friendly, low in cost and suitable for organic solid waste treatment.

The application relates to preparation of indoor potted solid water and belongs to the field of solid water preparation. A preparation method is as follows: nitrogen is introduced into a four-necked flask for 10 min to remove air, wheat bran and wheat B starch wastewater are added, heating and stirring are carried out, sodium alginate and gellan gum are added to prepare A liquid; acrylic acid is neutralized by adding 25% NaOH solution under the condition of an ice water bath, after the neutralized liquid is cooled to room temperature, 2-acrylamide-2-methylpropanesulfonic acid, bentonite, methylene bisacrylamide and potassium persulfate are added to prepare B liquid; B liquid is slowly added into A liquid, heating and stirring are carried out to perform polymerization reaction, after the reaction is completed, filtration is carried out, anhydrous ethanol and distilled water are used for washing, and indoor potted special solid water is obtained. The indoor potted solid water provided by the application can provide convenience for office workers to maintain potted plants, can improve soil permeability and water absorption and water retention capacity, has a long use period, and is prepared by using natural degradable materials and has low cost.

This invention belongs to the field of complex pollutant removal technology in water bodies, and specifically relates to a microbial composite hydrogel, its preparation method, and its application. The microbial composite hydrogel, by weight, comprises: 1-3 parts polyvinyl alcohol, 3-8 parts polyethylene glycol, 2-6 parts sodium alginate, 0.05-0.08 parts nano-titanium dioxide, 10-25 parts CaCl2, 10-25 parts boric acid, 5-15 parts potassium persulfate, and *Bacillus velezensis*, wherein the concentration of *Bacillus velezensis* is 0.35 × 10⁻⁶. 8 -0.6*10 8 Cells / mL. The microbial composite hydrogel of this invention can effectively treat multiple pollutants in wastewater simultaneously, has a more efficient pollutant degradation capacity and a wider range of applications, and realizes comprehensive integrated treatment of food wastewater.

This invention discloses a high-density composite for long-lasting water bottom improvement and disinfection, and its preparation method, relating to the field of aquaculture technology. The high-density composite is prepared from the following raw materials: a premixed additive, potassium persulfate, sodium chloride, gelatinized starch, bentonite powder, attapulgite, cement, calcium carbonate, titanate coupling agent, purified water, and molasses. This invention also discloses a method for preparing the high-density composite. The high-density composite for long-lasting water bottom improvement and disinfection of this invention has advantages such as long duration of slow-release bottom improvement, good stability, simple preparation method, low production cost, and ease of large-scale production. It fills the gap in slow-release bottom improvement products and solves the problems of current slow-release bottom improvement technologies, such as difficulty in controlling the slow-release rate, complex preparation methods, high production costs, and difficulty in large-scale production.

The application discloses a preparation method of organic garbage carbon source by composite enzyme combined with nitrogen precipitation. Firstly, enzyme pretreatment is performed on organic garbage materials, starch enzyme, cellulase and hemicellulase are used in cooperation to make macromolecular structure of organic matter be broken, so that preliminary release and partial dissolution of carbon source substances are realized; subsequently, sodium tetraphenylborate is added in the pretreatment system to selectively precipitate nitrogen substances in the solution, and centrifugal separation is performed to reduce nitrogen content of the system; on the basis, potassium persulfate and iron substances are added into the obtained suspension liquid to build a Fenton-like reaction system, residual organic macromolecules are further oxidized and degraded, and the structure is optimized, so that availability and stability of the carbon source are improved. In the whole process, each link cooperates, so that the organic garbage can be efficiently converted into high-quality carbon source with high C / N ratio and COD value, and can be used in a sewage treatment system as stable external carbon source.

The invention discloses a method for preparing a fluorinated ethylene-propylene emulsion, and relates to a polymer emulsion polymerization technology. Comprising the following steps: adding water into a reaction kettle, heating, and replacing with nitrogen to control oxygen; adding perfluoropolyether ammonium carboxylate, heating, adding an initial TFE / HFP mixed monomer, stirring, and adding a potassium persulfate solution to initiate polymerization; supplementing the mixed monomer in the reaction to maintain the pressure, and adding diethyl malonate and a copolymerization composition regulator at the same time; and stopping the reaction after the designed feeding amount is reached. According to the invention, the proportion of copolymerization units can be optimized, high monomer conversion is realized, and the emulsion with high solid content and uniform particle size is obtained.

The invention discloses a hydrophobic monomer copolymer oil-displacing agent with a demulsification function and a preparation method, and relates to the technical field of oilfield chemistry. The preparation method comprises the following steps: stirring a linear block polyether demulsifier and sodium hydroxide for reaction under a high-temperature condition; the preparation method comprises the following steps: preparing a linear block polyether demulsifier, stirring the linear block polyether demulsifier with p-chloromethyl styrene which is equal to the linear block polyether demulsifier in mole to react to obtain a hydrophobic monomer A with a demulsification function, dissolving the hydrophobic monomer A, acrylamide, potassium persulfate and VA-044 in a deionized water solution to obtain a reaction solution, introducing nitrogen to remove oxygen, adding sodium hydrogen sulfite, and carrying out adiabatic reaction until the temperature of the system is not increased any more; and crushing a polymer rubber block obtained after the reaction is completed, hydrolyzing in a sodium hydroxide solution, drying, and crushing. The oil-displacing agent contains a block polyether demulsifier structural unit, has better temperature resistance compared with linear high-molecular-weight hydrolyzed polyacrylamide and common hydrophobic modified polyacrylamide, and has no negative influence on demulsification and dehydration of crude oil emulsion.

The application relates to the technical field of soil chemical analysis, and discloses a multi-component grading detection method and a detection system for phosphorus in soil, which comprises the following steps: placing a soil sample in a centrifugal tube, and sequentially completing continuous extraction of at least two levels of different extractants without sample transfer in the whole process; after extraction, using a quantitative nondestructive transfer kit to transfer soil residues to a digestion container; adopting a two-step digestion procedure of low-temperature pre-digestion and high-temperature complete digestion to digest the soil residues; and using potassium persulfate solution to rapidly digest part of the extractant containing organic phosphorus; the application also provides a detection system for realizing the method, which comprises an extraction module, an organic phosphorus processing module, a residue phosphorus processing module and a detection module. The application completes multi-step extraction in a single container and optimizes key digestion steps, effectively solves the inaccuracy problem caused by sample transfer loss in the prior art, and significantly improves operation safety and analysis efficiency.

The invention relates to a hydrogel with both strength and electromagnetic wave absorption and a preparation method thereof. The preparation method of the hydrogel material comprises the following steps: S1, carrying out amination treatment on Fe3O4; s2, adding Fe3O4-NH2 and GO in the step S1 into deionized water, and carrying out ultrasonic dispersion; s3, adding polyethylene glycol methyl ether acrylate-480 and acryloyl morpholine into the dispersion liquid in the S2, and dissolving the polyethylene glycol methyl ether acrylate-480 and the acryloyl morpholine to obtain a mixed liquid; s4, removing dissolved oxygen in the mixed solution in S3, sealing the container, and stirring under an ice bath condition; s5, adding potassium persulfate and N, N, N ', N'-tetramethylethylenediamine into the mixed solution stirred in the step S4, and closing the container again; s6, the container is subjected to a polymerization reaction at the temperature of 60 DEG C, and hydrogel is obtained. Compared with the prior art, when the thickness of the hydrogel material is 2.07 mm, strong broadband microwave absorption is achieved, RLmin is-57.0 dB, EABmax is 6.4 GHz, meanwhile, excellent flexibility is kept, and the work provides a new view angle for developing a high-flexibility and efficient electromagnetic wave absorber.

The present application relates to the field of water treatment membrane separation technology, in particular to a corrosion-resistant and anti-blocking nanofiltration membrane for coal mine wastewater reverse osmosis treatment and a preparation method thereof, which is used to solve the problem that the existing nanofiltration membrane is prone to chemical corrosion and physical blockage, affecting the service life and treatment efficiency of the membrane; polyether sulfone is used as the base material, which has excellent film-forming property, anti-pollution property, chemical stability and corrosion resistance; amino-MXene, manganese-nickel nanowire and ZIF-8 nanoparticles are added, the amino-MXene enhances the Donnan exclusion effect on heavy metal ions, the manganese-nickel nanowire provides a catalytic site for potassium persulfate, the ZIF-8 nanoparticles provide an additional fast transport channel for water molecules, and the permeability and heavy metal removal rate are improved; polyvinyl alcohol and piperazine form hydrogen bonds to form Turing structures, increase the effective membrane area, and improve the water permeability; the zwitterionic polymer is grafted on the surface of the membrane to form a hydration layer with water molecules, prevent the adsorption of pollutants and prevent blockage.

The invention discloses a preparation method and application of a modified quartz sand adsorption material, and relates to the technical field of quartz sand adsorption materials.The preparation method comprises the following working steps that S1, alkali activation treatment is conducted; step S2, silanization modification; step S3, potassium persulfate activation; quartz sand is subjected to surface modification through three-step modification treatment, wherein a sodium hydroxide solution is adopted to activate the surface of the quartz sand, and hydroxyl groups are introduced; then, gamma-aminopropyltriethoxysilane (KH550) is used for carrying out silanization modification, and an amino functional group is grafted; finally, after amino is activated through potassium persulfate (K2S2O8), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is grafted, a sulfonic functional group is introduced, and a new group is introduced to modify the quartz sand, so that the adsorption capacity of the quartz sand as a seed crystal to calcium fluoride in a crystallization-induced coupled fluidized bed system is improved, and the effluent turbidity in the fluidized bed system is reduced. Compared with other seed crystals, the calcium fluoride adsorption capacity is higher, and the effluent turbidity is lower.

The invention discloses a preparation method of a Ca (OH) 2 activated fish scale-based adsorbent, and relates to the technical field of functional materials. Comprising the following steps: 1, pretreating fish scales: carrying out acid treatment on the cleaned and dried fish scales to obtain fish scales without surface protein, carrying out alkali treatment on the fish scales to obtain fish scale slurry, drying the fish scale slurry to obtain fish scale powder, and 2, dissolving the fish scale powder and Ca (OH) 2 in water according to a mass ratio of the fish scale powder to Ca (OH) 2 of 1: 3-3: 1, adding pyrrole, fully mixing, and carrying out drying to obtain the fish scale powder. The mass volume ratio of the fish scale powder to pyrrole is (1: 8)-(1: 2), and the volume ratio of pyrrole to the potassium persulfate aqueous solution is (3: 20)-(3: 5), and step 3, carrying out suction filtration and solid-liquid separation on the composite product, repeatedly washing to be neutral, and drying to obtain the polypyrrole composite Ca (OH) 2 activated fish scale-based adsorbent.