79 results about "Perfluorooctanoic acid" patented technology

The invention relates to the technical field of liquid-liquid homogeneous microextraction, in particular to a method for microextraction analysis of perfluorooctanoic acid by using a switchable eutectic solvent. Comprising the following steps: step 1, mixing a hydrogen bond acceptor and a hydrogen bond donor according to a set proportion value, and stirring and mixing at a set temperature value to obtain a eutectic solvent; step 2, filtering the water sample through a water-based filter membrane, then adding a set amount of deep eutectic solvent, dropwise adding an alkaline solution, carrying out full vortex mixing through a mixer, and then adding an acidic solution to form an emulsion; according to the method, the high selectivity of the green solvent with a specific structure on perfluorooctanoic acid and the characteristic that the solvent is switched between hydrophilic and hydrophobic forms are utilized, so that the microextraction time is shortened, and the impurity removal and enrichment effects are enhanced. The method is simple and convenient to operate, green, environment-friendly, low in cost and good in effect, has the advantage of efficiently and rapidly pretreating the batch small-size complex matrix sample, and has a relatively good application prospect.

This invention discloses a method for preparing an air-based hydrophilic-oleophobic coating, comprising the following steps: a) adding a silane coupling agent to ethanol to obtain solution A; b) first adding perfluorooctanoic acid and sodium hydroxide to ethanol to obtain a sodium perfluorooctanoate ethanol solution, then adding at least two types of hydrophilic nanoparticles of the same particle size to the sodium perfluorooctanoate ethanol solution to obtain solution B; c) adding a fluorinated surfactant and at least two types of hydrophilic nanoparticles of the same particle size to ethanol to obtain solution C; d) first mixing solution B and solution C uniformly to obtain solution D, then slowly adding solution A dropwise to solution D to obtain suspension E; e) spraying suspension E onto the surface of a substrate and drying at 55-65°C for 1-3 hours to obtain an air-based hydrophilic-oleophobic coating. The preparation method of this invention is simple, and the resulting coating exhibits excellent hydrophilicity and oleophobicity, acid and alkali resistance, salt resistance, and oil stain resistance.

The invention belongs to the technical field of degradation of persistent fluorine-containing pollutants, and particularly relates to an electrostatic self-assembly 3D nano flower-shaped Z-type heterojunction photocatalyst and a preparation method thereof. The problem that perfluorooctanoic acid formed by a common technology is difficult to degrade is solved. Comprising the following steps: dissolving an iron source and PVP (Polyvinyl Pyrrolidone) into a mixed solvent to form a solution A, dissolving an organic ligand into the mixed solvent to form a solution B, mixing the two solutions, putting the mixed solution into a polytetrafluoroethylene lining container, carrying out hydrothermal reaction, cooling to room temperature, centrifuging, washing and drying to obtain the Fe-BTC catalyst, respectively dissolving a bismuth source and a chlorine source into ethylene glycol, and carrying out hydrothermal reaction to obtain the Fe-BTC catalyst. And then mixing the two solutions, carrying out stirring ultrasonic treatment, adding a Fe-BTC catalyst, carrying out ultrasonic stirring, transferring the mixture into a polytetrafluoroethylene lining container, carrying out hydrothermal reaction, and after the temperature is reduced to room temperature, centrifugally collecting solids, washing and drying to obtain the composite photocatalyst. The composite catalyst prepared by the invention can efficiently degrade perfluorooctanoic acid under illumination.

The present invention relates to a process for enhancing the photocatalytic degradation of perfluorooctanoic acid by a foam-supported nanocatalyst, which comprises the following steps: the first step is the collection and detection of industrial wastewater containing perfluorooctanoic acid; the second step is the pH adjustment of the industrial wastewater; and the third step is the process for photocatalytically degrading perfluorooctanoic acid. By effectively inhibiting the aggregation of the nanocatalyst during the reaction, the present invention can achieve the effective degradation of perfluorooctanoic acid (the degradation rate is 73.2-99.9%) and the recycling and reuse of the nanocatalyst.

The application discloses a method for photocatalytic degradation of perfluorooctanoic acid in water by using boron hydroxide, and belongs to the field of wastewater treatment. The method comprises the following steps: adding boron hydroxide as a photocatalyst into water containing perfluorooctanoic acid, mixing thoroughly, and then performing a photocatalytic degradation reaction under a light source; the light source is ultraviolet light, yellow light or red light; and the pH of the water containing perfluorooctanoic acid ranges from 3 to 7. The method uses boron hydroxide (Al(OH)3, Ga(OH)3 and In(OH)3) which is low in cost and simple in preparation process to perform photocatalytic degradation of perfluorooctanoic acid, can improve the degradation efficiency of perfluorooctanoic acid in water, and can perform photocatalytic degradation under different light sources and in a wide pH range, so that the application range of photocatalysis is expanded, and the method is conducive to the treatment of PFOA contaminated water in actual production.

The invention discloses a tetrapyridine pyrene-based metal organic cage as well as a preparation method and application thereof, and belongs to the technical field of supramolecular chemistry. The metal organic cage is prepared from a tetrapyridine pyrene ligand, a tetradentate sodium carboxylate ligand and a cis-platinum metal ligand, and the metal organic cage is endowed with photocatalytic performance by introducing a photosensitive group into the ligands, so that the metal organic cage can effectively degrade perfluorooctanoic acid through a photo-induced electron transfer mechanism, thereby realizing an adsorption-degradation integrated function. The metal organic cages can release effective reactive oxygen species under the irradiation of a 365 nm ultraviolet lamp and can degrade the perfluorooctanoic acid, the defluorination rate can reach 80%, the perfluorooctanoic acid is degraded into a short-chain compound, and a photodegradation system is artificially prepared.

The invention belongs to the technical field of electrochemical luminescence analysis and detection, and relates to an electrochemical luminescence sensor of a defective iron metal organic framework enhanced pyrenyl self-assembled hydrogen bond organic framework, and a preparation method and application thereof. Comprising the following steps: dispensing a PSA-HOF / Pca-MIL-88B (Fe) dispersion liquid on a GCE electrode, drying, dropwise adding a perfluorooctanoic acid aptamer, reacting at room temperature to finally obtain an aptamer modified PSA-HOF / Pca-MIL-88B (Fe) electrode as a working electrode, Ag / AgCl as a reference electrode and a Pt electrode as a counter electrode, and introducing the aptamer modified PSA-HOF / Pca-MIL-88B (Fe) electrode, Ag / AgCl as a reference electrode and a Pt electrode as a counter electrode into a PBS phosphate buffer solution containing potassium persulfate for detecting perfluorooctanoic acid. The prepared PSA-HOF / Pca-MIL-88B (Fe) system electrochemical luminescence sensor has the characteristics of simplicity, convenience and flexibility in operation, wide detection range, low detection limit, low detection cost and the like.

The invention provides a preparation method and application of an electrochemical luminescence aptamer sensor for detecting perfluorooctanoic acid (PFOA) in a water environment by adopting an apt / CHIT / Zn TCPP (at) MOF / GCE modified electrode based on an electrochemical luminescence method. The preparation method comprises the following steps: electrically depositing a zinc tetraphenylporphyrin functionalized metal organic framework (Zn TCPP-coated MOF / GCE) on a glassy carbon electrode (GCE), and further modifying an aptamer (apt) of chitosan (CHIT) and PFOA to prepare an apt / CHIT / Zn TCPP-coated MOF / GCE modified electrode. The modified electrode apt / CHIT / Zn TCPP (at) MOF / GCE prepared on the basis of an electrodeposition technology is low in detection limit and good in reproducibility, pretreatment of concentration and enrichment on a water environment sample is not needed due to high sensitivity, and analysis operation on PFOA is simple and easy to implement.

The invention discloses a constructed wetland microbial fuel cell coupled photocatalytic system for treating fluorine-containing caprylic acid wastewater, and relates to a constructed wetland microbial fuel cell coupled photocatalytic system. The invention aims to solve the problem that CW-MFC and photocatalysis are not combined to improve the removal rate of PFOA at present. The device comprises a reactor shell, a bottom filler layer, an anode region, a middle filler layer, a cathode region, wetland plants and an outer resistor, the bottom packing layer, the anode region, the middle packing layer and the cathode region are sequentially overlapped in the reactor shell from bottom to top, the cathode region loaded with a photocatalyst is connected with the anode region through an external resistor to form a circuit, a water inlet is formed in the lower part of the reactor shell, and a water outlet is formed in the upper part of the reactor shell. And the roots of the wetland plants penetrate through the cathode region and are planted in the middle filler layer. The invention belongs to the technical field of perfluorinated compound pollution remediation.

The present application relates to a kind of supramolecular surfactants based on fluorine-fluorine interaction, belong to supramolecular coordination chemistry, surface modification engineering and hydrophobic coating technical field.The esterification reaction of perfluorooctanoic acid and high molecular weight polypropylene glycol is carried out in the present application to prepare flexible ligand PFOA-PPG-PFOA, the ligand can be bent, form supramolecular micelles by fluorine-fluorine interaction with the help of zinc ion in solvent, and self-assemble into a kind of supramolecular surfactants based on fluorine-fluorine interaction.The active agent can be applied in the field of hydrophobic coating, coating has the characteristics of imitating lotus leaf structure and hydrophobic wax, and has good hydrophobic performance.

The present application provides a method for preparing modified magnetic particles and a method for continuous demulsification of the modified magnetic particles, including: adding vinyltrimethoxysilane to absolute ethanol and stirring to obtain solution A; adding perfluorooctanoic acid and sodium hydroxide to absolute ethanol and stirring to obtain solution B; adding magnetic particles to the mixed solution of solution A and solution B, transferring it to a reaction kettle, placing it at 80-90 °C and keeping warm for 0.5-2 h, cooling, and drying to obtain modified magnetic particles; applying the modified magnetic particles to the method of turbulent dispersion continuous demulsification, pumping the emulsion into a stirring tank through a peristaltic pump to mix with M-MMPs, and the hydraulic retention time in the stirring tank is greater than or equal to 30 s; controlling the surface magnetic field intensity of the electromagnet above 400 Gs, the height of the separation chamber is less than 5 cm, the hydraulic retention time of the emulsion in the separation chamber is greater than 30 s, and collecting the separated oil and water; preventing the modified magnetic particles from gradually adhering to the wall surface of the separation chamber to achieve the optimal separation effect.

The invention discloses a heterojunction material, a preparation method thereof and application of the heterojunction material in photocatalytic degradation of perfluorooctanoic acid. The preparation method of the heterojunction material comprises the following steps: dissolving a bismuth salt in a solvent, adding an iodized salt and a transition metal oxide MOx, mixing to obtain a mixed solution, and carrying out a constant-temperature hydrothermal reaction to obtain the heterojunction material. According to the invention, two inorganic semiconductors bismuth oxyiodate and transition metal oxide MOx are compounded to obtain the heterojunction material. In the material, bismuth oxyiodate and MOx form a heterojunction, carrier recombination is inhibited, the photocatalytic performance is improved, the material can be used as a photocatalyst, and the perfluorooctanoic acid is efficiently degraded through two different paths while the solar energy utilization rate is improved. The bottleneck problem that perfluoro caprylic acid residues cannot be thoroughly cleaned, degraded and degraded in the field is solved, perfluoro caprylic acid is converted into volatile perfluoroalkane, and wide application prospects are achieved.

The invention belongs to the technical field of photoelectrochemical analysis, and particularly relates to a photoelectrochemical sensor based on a Bi2S3 / WO3 composite material as well as a preparation method and application thereof. According to the invention, a Bi2S3 nanostructure is grown in situ on the surface of a WO3 substrate based on a hydrothermal method, and the Bi2S3 / WO3 composite material is successfully constructed. Bi2S3 / WO3 is used as a photoelectric active substrate, an aptamer of a perfluoroalkyl compound is fixed on the surface of a photoelectrode by adopting a cross-linking coupling method, and a PEC biosensing platform capable of singly or simultaneously detecting perfluorooctanoic acid (PFOA), perfluoroheptanoic acid (PFHpA) and perfluorohexyl sulfonic acid (PFHxS) is constructed. And a simple and rapid photoelectrochemical method with excellent analysis performance is provided for synchronous detection of single or multi-component PFCs pollutants in the environment.

The invention discloses a preparation method and application of alkali-acid synergistic modified biomass activated carbon, and belongs to the technical field of treatment of water environment polluted by refractory organic pollutants by using adsorbents. Waste biomass is used as a raw material to prepare biochar, and the biomass raw material is firstly subjected to alkali high-temperature activation and then subjected to acid hydrothermal activation to prepare the alkali-acid synergistic modified biomass activated carbon. The alkali-acid synergistic modified biomass activated carbon prepared by the method is used for pollution treatment of wastewater polluted by refractory organic matters, can greatly reduce pollution of the refractory organic matters to the natural environment, and can be applied to adsorption treatment of wastewater containing methylene blue and perfluorooctanoic acid; and the actual adsorption capacities of methylene blue and perfluorooctanoic acid respectively reach 747 mg / g and 515 mg / g.

The present invention discloses a modified vermiculite-loaded cubic cobalt-manganese spinel material and a preparation method thereof, belonging to the technical field of environmental remediation functional materials. The present invention first synthesizes cubic cobalt-manganese spinel by in-situ coprecipitation on the surface and interlayers of vermiculite. The vermiculite-loaded cubic cobalt-manganese spinel material is then modified using hexadecyltrimethylammonium bromide to prepare the modified vermiculite-loaded cubic cobalt-manganese spinel material. The reaction conditions are mild, and no toxic or hazardous raw materials are involved. The prepared catalyst is stable, efficient, and environmentally friendly, effectively reducing the activation energy of oxidants such as peroxymonosulfate, thereby achieving efficient removal of perfluorooctanoic acid.

This invention discloses a fluoride-modified liquid metal thermite and its preparation method, belonging to the field of thermite preparation technology. It utilizes Galinstan eutectic to prepare liquid metal; aluminum powder and liquid metal are synthesized using physical mixing and ultrasonic treatment to obtain liquid metal-modified aluminum; FeCl3·6H2O is added to a perfluorooctanoic acid aqueous solution and stirred, followed by a hydrothermal reaction; the resulting product is washed to obtain Fe(PFO)3; the liquid metal-modified aluminum is mixed with iron perfluorooctanoate and ultrasonically treated to obtain Fe(PFO)3@LM-Al; Fe(PFO)3@LM-Al and iron oxide are added to anhydrous ethanol and ultrasonically stirred to obtain Fe(PFO)3@LM-Al@Fe2O3. This invention, using the above method, raises the high-temperature thermal oxidation reaction temperature of aluminum powder to before the melting point of 660℃, achieving a breakthrough in the thermal mass transfer process of aluminum powder.

The invention discloses a compression garbage truck metal plate coating with fireproof performance and a preparation method thereof, and belongs to the technical field of fireproof coatings. The compression garbage truck metal plate coating with the fireproof performance comprises the following raw material components in parts by mass: 33-48 parts of epoxy resin, 15-20 parts of a flame retardant, 3-9 parts of a corrosion-resistant filler, 14-16 parts of a diluent, 32-50 parts of a curing agent and 39-61 parts of a fluorocarbon toughening agent. Wherein the flame retardant is obtained by reacting a hydrogenated rosin-based silane coupling agent with ammonium polyphosphate; the hydrogenated rosin-based silane coupling agent is obtained by reacting hydrogenated rosin with an epoxy silane coupling agent; the corrosion-resistant filler is obtained by modifying basalt flakes with an amphiphilic silane coupling agent; the curing agent is an amine curing agent; the fluorocarbon toughening agent comprises perfluorooctanoic acid; the prepared compression garbage truck metal plate coating with the fireproof performance is good in corrosion resistance, fireproof and flame-retardant performance, impact toughness and abrasion resistance.

The invention relates to the technical field of environmental engineering and adsorption materials, in particular to a preparation method of a fluorinated polyaniline nanofiber membrane and application of the fluorinated polyaniline nanofiber membrane in removal of PFASs in water. The preparation method comprises the following steps: performing electrostatic spinning on a polyacrylonitrile solution to obtain a polyacrylonitrile nanofiber membrane; mixing aniline, m-fluoroaniline, an acid solution and an oxidant solution to obtain a fluorinated polyaniline precursor solution; the polyacrylonitrile nanofiber membrane is soaked in the fluorinated polyaniline precursor solution for a reaction, and a fluorinated polyaniline polyacrylonitrile nanofiber membrane is obtained; the adsorption capacity of the fluorinated polyaniline polyacrylonitrile nanofiber membrane to perfluorooctanoic acid in water reaches an unprecedented level, and meanwhile, the fluorinated polyaniline polyacrylonitrile nanofiber membrane has rapid adsorption kinetics and anti-interference performance. Moreover, the method can almost completely remove long-chain and short-chain PFASs in a plurality of real water bodies at an ultra-low concentration. In addition, excellent removal efficiency is still maintained after 10 times of regeneration cycles in a plurality of actual water bodies.

The present invention relates to systems and methods for catalytic removal of oxidized contaminants (for example, nitrite, chromate, chlorate, trichloroethene, CFC-11, 4-nonylphenol, RDX, and perfluorooctanoate) from water and wastewater. In some aspects, the catalytic method of removing oxidized contaminants comprises using precious metal nanoparticles as catalysts to reduce the oxidized contaminants.

Devices, apparatus, and methods to treat Per-and polyfluoroalkyl substances (PFAS) and related telomeres including perfluorooctanoic acid (PFOA) and Perfluorooctanesulfonic (PFOS), and other recalcitrant highly stable organic compounds, substances, organic matter, infectious fluids, bacteria, viruses and other pathogens, endocrine disruptors, pharmaceutical, and otherwise oxidizable material contaminants in water, aqueous fluids, condensates, concentrates, brines, and spent solid adsorbent media. The system can include hydrodynamic cavitation; acoustic sonication; electrochemical oxidation; in-line static mixing; and supplemental reagent precursors to create powerful oxidizing conditions within the equipment, and oxidants by the system that destroy said contaminants.

The present invention discloses a kind of red fluorescent carbon dots, a preparation method thereof and an application in detecting perfluorooctanoic acid. Oxalic acid, meso-tetra(4-carboxyphenyl) porphine and ethanolamine are heated in water to 140-220 °C for hydrothermal reaction for 4-20 h, and then the reaction product is filtered. The filtrate obtained by filtration is dialyzed and dried to obtain red fluorescent carbon dots. The red fluorescent carbon dots can be used as a fluorescent probe to detect perfluorooctanoic acid in environmental samples. The present invention uses oxalic acid, meso-tetra(4-carboxyphenyl) porphine and ethanolamine as carbon sources, and synthesizes red fluorescent carbon dots by a hydrothermal method. The preparation method is simple and easy to implement. The red fluorescent carbon dots of the present invention have high monodispersity, good stability, good water solubility and high fluorescence stability. The simple, rapid, highly sensitive and highly selective detection of perfluorooctanoic acid is realized by the static quenching between the red fluorescent carbon dots and perfluorooctanoic acid.

The invention relates to a PPAR gamma polypeptide and application thereof in monitoring marine perfluorooctanoic acid pollution, and belongs to the technical field of biology, the amino acid sequence of the polypeptide is shown as SEQ ID NO.1, the invention further provides application of the PPAR gamma polypeptide in monitoring marine perfluorooctanoic acid pollution, and a high-sensitivity PFOA immunofluorescence detection technology is established based on the polypeptide. The lowest detection limit is 1.5 ng / L, the linear range interval is 5-80 ng / L, and an innovative method is provided for high-sensitivity monitoring of PFOA in environmental and biological samples.

The invention discloses a photoelectrochemical self-energized sensor and application thereof in detection of perfluorooctanoic acid (PFOA), and belongs to the technical field of photoelectrochemical detection. The preparation method comprises the following steps: modifying a compound of a hydrogen bond organic framework material (PSA-HOF) and dWO3.H2O on FTO to serve as a photo-anode, and then modifying an aptamer capable of specifically recognizing PFOA to obtain a modified electrode apta / PSA-HOF / dWO3.H2O / FTO; the modified electrode is used as a photo-anode to be assembled with a cathode platinum sheet and a single-chamber quartz electrolytic tank, a sodium sulfate solution containing PMS is used as electrolyte, and the photoelectric self-energized sensor is constructed and used for detecting and analyzing the concentration of PFOA in a sample. The photoelectric self-powered sensor provided by the invention has the characteristics of low detection limit, rapid detection, high sensitivity and specific detection.

The invention discloses a method for reducing perfluorooctanoic acid in crops by applying nitrate nitrogen fertilizer to competitively inhibit nitrate transporter protein, and relates to the technical field of agricultural pollutant control. Calcium nitrate Ca (NO3) 2 is used for providing 4-16 mmol / L or mmol / kg nitrate (NO3 <->) nitrogen fertilizer for lettuce planting under the water culture or soil culture condition; the transmembrane transport of nitrate transporter protein to perfluorooctanoic acid (PFOA) is competitively inhibited, and the accumulation amount of the edible part PFOA of the lettuce is reduced. By applying the nitrate nitrogen fertilizer, transmembrane absorption of NRT2.7 transport protein on PFOA is competitively inhibited, accumulation of PFOA in the lettuce is remarkably reduced, the food safety is improved, crop growth is synchronously promoted, and double benefits of pollution reduction and yield increase are achieved. The method is easy and convenient to operate, high in adaptability and suitable for water culture and soil culture conditions, and has the good popularization prospect and the cost advantage. The mechanism has universality in various crops and has wide extension application value.

The invention belongs to the technical field of sewage treatment, and particularly relates to preparation of an iron-carbon material-persulfate composition and application of the iron-carbon material-persulfate composition to degradation of perfluorooctanoic acid in a water body. The iron-carbon material-persulfate composition provided by the invention comprises an iron-carbon material and peroxymonosulfate, the iron-carbon material comprises a carbon material and vulcanized nano zero-valent iron loaded on the carbon material; the mass ratio of the iron-carbon material to the peroxymonosulfate is (0.1-2): (0.1-2). The method for degrading the perfluorooctanoic acid in the water body, provided by the invention, comprises the following steps: putting an iron-carbon material-persulfate composition into the water body containing the perfluorooctanoic acid, and degrading the perfluorooctanoic acid in the water body. According to the degradation method provided by the invention, the iron-carbon material and the peroxymonosulfate are utilized to generate a synergistic effect, the degradation effect on the PFOA in the water body under the environment concentration is good, the method has practical application value, secondary pollution is not caused in the degradation process, and the method is an effective method for removing the PFOA.

The invention discloses a preparation method and application of a p-n type NiO / Bi5O7I heterojunction photocatalyst, and belongs to the technical field of photocatalysis. The invention aims to solve the problems of limited visible light utilization depth and photon-generated carrier separation efficiency and lower specific surface area restriction performance of the existing Bi5O7I and overcome the defects of low light utilization efficiency and insufficient photocatalytic activity under visible light caused by wide band gap and low Ni < 3 + > concentration of the existing NiO photocatalyst. The preparation method comprises the following steps: 1, dissolving bismuth nitrate and nickel acetate in ethanol; 2, dissolving potassium iodide in water; 3, mixing reaction; 4, carrying out hydrothermal reaction; and 5, high-temperature calcination. According to the application, the strain is used for degrading perfluorooctanoic acid in a water environment The preparation method is used for preparation and application of the p-n type NiO / Bi5O7I heterojunction photocatalyst.

The application discloses a novel fluorocarbon betaine surfactant and a preparation method thereof, and belongs to the field of surfactant synthesis and application. The preparation method comprises the following steps: (1) adding perfluorohexyl ethyl alcohol and tetrahydrofuran into a reaction container, adding sodium hydride, and then adding chloroacetic acid methyl ester drop by drop; after reaction at a high temperature, an intermediate 1 is obtained; (2) adding N,N-dimethyl-1,3-propanediamine into the intermediate 1, and then performing reaction at a high temperature to obtain an intermediate 2; (3) adding a solvent and a sodium salt into the intermediate 2, and then performing reaction at a high temperature of 70-90 DEG C to obtain the novel fluorocarbon betaine surfactant. The novel fluorocarbon betaine surfactant does not contain perfluorooctanoic acid (PFOA) and perfluorohexane sulfonic acid (PFHxS) substances, is green and environment-friendly, has a small influence on the environment, does not have influences on human reproduction, development and immune system, can effectively stabilize foam, is resistant to high temperature, and can improve the fire extinguishing performance of a foam fire extinguishing agent. In the aspect of oil displacement agents, the novel fluorocarbon betaine surfactant can reduce oil-water interfacial tension, stabilize emulsions and improve the recovery efficiency of crude oil.

The invention relates to the technical field of composite molded boards, in particular to a nanofiber-reinforced super-thick PTFE composite molded board which comprises the following components in percentage by weight: a matrix material: 70-85% of PTFE resin; nanofiber reinforcement: 5%-15% of PI nanofibers and 2%-8% of modified carbon nanotubes; functional additives: 3%-10% of fluorinated graphene and 1%-5% of nano SiO2; and a processing aid: 0.5%-2% of hydroxypropyl methyl cellulose ether and 1%-3% of ammonium perfluorooctanoate. The invention relates to a lamination forming process of a nanofiber-reinforced super-thick PTFE (Polytetrafluoroethylene) composite molded board. The lamination forming process comprises the following steps: step 1, pretreating nanofibers; step 2, mixing and pre-pressing; and step 3, designing a laminated structure. The gradient lamination design is combined with surface layer-core layer function differentiation, and the problem that the interlayer peeling strength of a traditional PTFE plate is low is solved.

The invention discloses an electrochemical sensor for detecting perfluorooctanoic acid based on molecular imprinting as well as a preparation method and application of the electrochemical sensor. The electrochemical sensor is used for analyzing and detecting an acid mist inhibitor perfluorooctanoic acid (PFOA) in a pickling solution. The electrochemical sensor comprises a carbon quantum dot and a composite membrane modified glassy carbon electrode of polypyrrole and N-trifluoromethyl pyrrolidine-3-amine, wherein the composite membrane is imprinted with a PFOA structure, and the modified electrode CDs / PPy (PFPy)-MIP (PFOA) / GCE capable of selectively recognizing PFOA is prepared. The modified electrode is used as a working electrode, the PFOA in the pickling solution is detected by adopting an electrochemical alternating-current impedance technology, and the lowest detection limit reaches 0.064 mg / L. The electrochemical sensor provided by the invention does not need to carry out pretreatment such as separation on a sample, can carry out analysis and detection only by diluting the sample, and has the advantages of high selectivity, simplicity in operation and the like.

The invention discloses a quaternary ammonium surfactant with a fluorocarbon-silicon-carbon double hydrophobic chain and a preparation method thereof, wherein the preparation method is by N-((dimethylamino) methyl)-4,4,5,5,6,6,6-heptafluoro-3,3-bis(trifluoromethyl) hexanoamide, 3-chloropropylmethyldimethoxysilane, potassium iodide and solvent in a reaction vessel, heating and stirring are completely dissolved to raw material, temperature reaction is continued afterwards, solvent and water are removed by decompression distillation after the reaction terminates, and washed with ethanol until washings do not change color, to obtain a quaternary ammonium surfactant with a fluorocarbon-silicon-carbon double hydrophobic chain;The surfactant is free of perfluorooctanoic acid (PFOA) and perfluorohexanesulfonic acid (PFHxS) substances, possesses environmentally friendly characteristics, will not have an impact on human nervous system, immune system, endocrine system and genetic information etc., can effectively produce foam, with good heat stability, it is possible to improve the foaming performance and the burning resistance of foam fire extinguishing agent. Wetting agent aspect can reduce aqueous solution surface tension, wets low-energy surface.