80 results about "Perfluorocaprylic acid" patented technology

The invention discloses a method and system for identifying perfluorooctanoic acid pollutants in tap water, and relates to the field of water environment new pollutant detection, and the method comprises the steps of SERS spectral signal collection, signal preprocessing, bimodal learning device construction and training verification, and concentration prediction result generation based on numerical value and image bimodal. The to-be-predicted data is put into the trained bimodal learning device for prediction and identification, and the concentration of the detection sample is output, so that batch rapid detection based on surface enhanced Raman spectroscopy and bimodal deep learning is realized, and high-precision identification and prediction based on small sample data are realized; the accurate detection result of the perfluorooctanoic acid pollutants in the tap water is obtained.

The invention discloses a perfluorinated compound adsorption material and a preparation method thereof. Comprising the following steps: 1) placing moso bamboo in a high-temperature carbonization furnace for carbonization treatment, after carbonization is completed, taking out bamboo charcoal, carrying out acid treatment to remove surface impurities and part of ash, then repeatedly washing the bamboo charcoal with deionized water until the bamboo charcoal is neutral, and finally drying the bamboo charcoal to obtain pretreated bamboo charcoal; and 2) putting the pretreated bamboo charcoal into a chitosan acetic acid solution to load chitosan on the surface of the bamboo charcoal, repeatedly washing the bamboo charcoal with deionized water to remove unloaded chitosan, and then drying to obtain the perfluorinated compound adsorption material. The prepared adsorption material has high adsorption capacity and selectivity on perfluorinated compounds, the adsorption performance of the adsorption material on the perfluorinated compounds is improved by modifying the bamboo charcoal, and the adsorption capacities of the adsorption material on perfluorooctanoic acid and perfluorooctane sulfonic acid can reach 400 mg / g and 450 mg / g respectively.

The invention discloses a hydrophobic porous adsorption material for removing perfluorooctanoic acid in water and application of the hydrophobic porous adsorption material. The hydrophobic porous adsorption material is prepared by carrying out free radical polymerization reaction on an imidazolyl ionic liquid monomer and divinyl benzene. The hydrophobic porous adsorbent combines the advantages of good pore channel diffusion, electrostatic adsorption, hydrophobic interaction and the like, and shows excellent adsorption performance and extremely high adsorption rate under different initial concentrations of perfluorooctanoic acid. The adsorption material provided by the invention is simple in preparation method and low in cost, the adsorption performance of the adsorption material on the perfluorooctanoic acid is remarkably improved through the synergistic effect of multiple mechanisms, and the adsorption material is an effective scheme for efficiently removing the perfluorooctanoic acid.

The invention discloses a lateral flow chromatography test strip for detecting perfluorooctanoic acid by combining gold nanoparticles, a nucleic acid aptamer and an antibody. According to the test strip, a nucleic acid aptamer marked by gold nanoparticles is combined with PFOA molecules to form a nucleic acid aptamer with a G-quadruplex structure, and then the nucleic acid aptamer with the G-quadruplex structure is specifically recognized and captured by an anti-BG4 antibody, so that specific visual detection of perfluorooctanoic acid is realized. After a sample is injected, a G-quadruplex structure formed by the PFOA and the nucleic acid aptamer acts with the anti-BG4 antibody coated on the test strip, so that the gold nanoparticles are agglomerated to generate a chromogenic reaction, the signal intensity can be detected by naked eyes or reading equipment, the visual detection limit is 10 mu M, and the equipment detection limit is 304 nM. The test strip has the advantages of high detection speed, high specificity and high sensitivity, and is suitable for field detection and rapid screening. Compared with a traditional method, the method realizes simple, convenient and economical detection of PFOA, and has a wide application prospect.

The present invention relates to a preparation method and application of a supramolecular aggregate surfactant, and belongs to the field of supramolecular coordination chemistry, surface modification engineering and hydrophobic coating technology. In the present invention, 4-hydroxypyridine-2,6-dicarboxylic acid and malonic acid prepare an adhesive ligand, and with the help of the coordination of the carboxyl structure and lanthanum ions on 4-hydroxypyridine-2,6-dicarboxylic acid and perfluorooctanoic acid, a supramolecular aggregate in a nano-aggregated state is obtained, which is self-assembled into a supramolecular aggregate surfactant. The active agent can solubilize fluoride and can also be applied in the field of hydrophobic coatings. The coating has the characteristics of imitating lotus leaf structure and hydrophobic wax, and has good hydrophobic properties.

The invention discloses a Fe-GL-Fe < 0 > catalyst and a preparation method and application thereof, and belongs to the technical field of water treatment. The preparation method is simple, the requirement for equipment is low, the prepared Fe-GL-Fe < 0 > catalyst can effectively remove perfluorinated compounds such as perfluorooctanoic acid, perfluorooctane sulfonic acid, perfluorononanoic acid and perfluorooctane sulfonic acid in water under the environment atmosphere condition without external energy input, and the removal rate and the defluorination rate are both larger than 95%; the catalyst belongs to a solid catalyst, is convenient to separate from water, is recycled, keeps a high removal effect, and is low in metal ion dissolution rate.

To provide a means effective in suppressing oxidative deterioration of fats and oils containing polyunsaturated fatty acid containing DHA and to provide a method capable of determining near olfactory sense of human being by specifying a component that becomes an index of oxidative deterioration of fat and acid containing DHA.SOLUTION: A lipid composition containing lipids composed of polyunsaturated fatty acids as constituent fatty acids, wherein a composition ratio of polyunsaturated fatty acids among all constituent fatty acids of the lipids is 15% or more, the moisture content is 600 ppm or less, perfluorooctanesulfonic acid is 0.1 ppb or less, and perfluorooctanoic acid is 0.1 ppb or less. It is preferable that the composition contains 2-(2-pentenyl)furan at less than 0.0095 ppm, and 2,4-heptadienal at less than 2.600 ppm.SELECTED DRAWING: None

The application relates to a synthesis method of a positive electric three-component covalent organic polymer and application thereof, and belongs to the technical field of sewage treatment. The method is as follows: 1,3,5-benzene triformylhydrazine is dissolved in an organic solvent dimethyl sulfoxide to obtain a solution A; 1,3-diamino guanidine hydrochloride is dissolved in the solution A to obtain a solution B; 2,3,5,6-tetrafluoro-p-xylene dicarboxaldehyde is dissolved in the solution B to obtain a solution C, and the preparation of the solutions is carried out in a constant-temperature oil bath; then, the orange wet gel is obtained by heating at 100 DEG C for 30s; the orange wet gel is placed in a dialysis bag for dialysis, the mixture is taken out for freezing, and then the freezing drying is carried out under vacuum to obtain the positive electric three-component covalent organic polymer. The synthesis method is simple, high in yield and fast in speed, the specific surface area of the positive electric three-component covalent organic polymer is large, the positive electric three-component covalent organic polymer has a hierarchical porous structure and rich reaction active sites, and can be used as a high-efficiency adsorbent to remove perfluorooctanoic acid in water.

The invention relates to the field of persistent pollutant detection and repair, in particular to a cationic polythiophene derivative for detecting and removing perfluorinated compounds and a method thereof, the provided cationic polythiophene derivative has good water solubility, shows obvious specificity in detection, can sensitively detect the perfluorinated compounds, and can be used for detecting and removing the perfluorinated compounds. Conformations and aggregation states of the compounds with the structures as shown in the formula (I) and the formula (II) in a solution show different states to external stimulation, so that the optical characteristics of the compounds are changed. The types of the detected and removed perfluorinated compounds comprise short-chain perfluoroalkyl carboxylic acid (perfluorobutyric acid PFBA and perfluorohexanoic acid PFHxA), long-chain perfluoroalkyl carboxylic acid (perfluorocaprylic acid PFOA and perfluorododecanoic acid PFDoA), short-chain perfluoroalkyl sulfonic acid (trifluoromethanesulfonic acid TFMS, perfluorobutyl sulfonic acid PFBS and perfluorohexyl sulfonic acid PFHxS) and long-chain perfluoroalkyl sulfonic acid (perfluorooctyl sulfonic acid PFOS).

This invention discloses a defect-state indium oxide photothermal catalyst, its preparation method, and its application. The catalyst is indium oxide (In₂O) containing oxygen vacancies. 3‑x The catalyst exhibits a co-doped cubic and hexagonal crystal structure. The oxygen defects include oxygen vacancies and unsaturated In(III) sites associated with these vacancies. The preparation method involves a solvothermal reaction of indium nitrate and urea in a 50-95 v / v% ethanol aqueous solution to obtain the precursor c / h-InOOH. The precursor is then calcined to obtain c / h-In2O3. Finally, c / h-In2O3 is heat-treated with a reducing agent to construct oxygen defects. This invention, through crystal doping and the synergistic structure of oxygen defects in In2O3, enables the catalyst to possess full-spectrum absorption capabilities, more efficient carrier separation capabilities, and photothermal synergistic capabilities, thereby improving the efficiency of photothermal catalytic degradation of PFOA.

The invention discloses a preparation method of a light regeneration iron-based ceramic membrane and application of the light regeneration iron-based ceramic membrane in removal of perfluorinated compounds, and the preparation method of the FCM comprises the following steps: fully grinding kaolinite and an iron-loaded zeolite molecular sieve (Fe-zeolite) by using a mortar, then adding a polyvinyl alcohol solution as a binder, and continuously grinding; pressing and molding the dried powder of the mixture by using a hydraulic machine, and sintering in a muffle furnace to obtain the iron-based ceramic membrane. The obtained iron-based ceramic membrane can efficiently filter and remove low-concentration perfluorinated compounds in a water body, the iron-based ceramic membrane enriched with the perfluorinated compounds can efficiently degrade, defluorinate and regenerate the perfluorinated compounds through ultraviolet irradiation under a non-aqueous phase condition, and the iron-based ceramic membrane has a good application prospect.

The invention provides a safe lead for fireworks and crackers. The lead wire is composed of a lead wire body and a protection structure, and the lead wire body is various conventional lead wires. The protection structure is divided into four layers, namely a flame-retardant layer, a heat insulation layer, a water repellent layer and an anti-static coating. The flame-retardant layer is composed of one or more of alumina fiber, magnesium hydroxide, aluminum hydroxide, zinc borate, ammonium polyphosphate, tricresyl phosphate and phenolic resin; the water repellent layer is composed of one or more of organic silicon resin, perfluorooctanoic acid or ammonium salt thereof, fluorocarbon and paraffin; the anti-static coating is composed of one or more materials of polyvinyl chloride, nylon and silica gel. According to the safe lead for the fireworks and the crackers, through single-layer or multi-layer protection and special materials, the safety performance of the fireworks and the crackers is remarkably improved, the accident risk is reduced, and meanwhile good environmental adaptability and operation convenience are achieved.

The invention belongs to the technical field of photoelectrochemical detection, and particularly relates to a preparation method of a photoelectric self-energized electrochemical sensor and application of the photoelectric self-energized electrochemical sensor in detection of perfluorooctanoic acid (PFOA). The electrochemical aptamer sensor based on the ultrathin Bi2WO6 nanosheet / Ti3C2 quantum dot composite material is constructed by coating the ultrathin Bi2WO6 nanosheet / Ti3C2 quantum dot composite material on FTO (Fluorine-doped Tin Oxide) and then coating the surface of the composite material with a PFOA (Perfluorooctanoic Acid) aptamer. When being used for PFOA detection, the fluorescent probe shows high stability, high sensitivity and wide linear range, has good reproducibility, and can realize simple, rapid, efficient and specific detection.

The invention relates to the technical field of phase change materials, and discloses an MXene / MWCNT reinforced charcoal-based composite phase change material and a preparation method thereof, the preparation method comprises the following steps: S1, preparing MWCNT and a metal salt to obtain a suspension; adding biomass into the suspension, and drying to obtain a precursor; s2, performing heat treatment on the precursor to obtain biochar; blending and drying the biochar and a perfluorooctanoic acid ethanol solution to obtain a support material; s3, blending and drying the support material and an MXene solution to obtain an enhanced support material; s4, the enhanced support material is subjected to a vacuum impregnation method, and the bio-based composite phase change material is obtained. Compared with paraffin and unreinforced composite PCM, the heat conductivity of the composite PCM prepared by the invention is respectively improved by 313.77% and 26.3%. And by adopting the biochar-based support material, the paraffin encapsulation efficiency is improved again and reaches 85.18%.

This invention discloses a supported boron-doped palladium oxide cluster catalyst, its preparation method, and its application. The preparation method includes optimizing the geometry and electronic structure of the Pd clusters through Pd precursor regulation and B atom doping. The B-doped Pd oxide cluster material substrate is carbon nitride, the Pd cluster loading is 0.5-2%, and B atoms are distributed in the Pd clusters. The molar ratio of B to Pd atoms is 0.01-0.2:1, and the average valence of Pd atoms is Pd₂. 1+ -Pd 4+ This catalyst can efficiently mineralize perfluorooctanoic acid and other carboxylic acid perfluorinated compounds in water through a chain reaction of decarboxylation coupled with hydroxylation and defluorination under normal temperature and pressure. The defluorination rate exceeds 95%, and its activity is not affected by environmental factors such as ions, dissolved organic matter, and pH in the water. The catalyst is suitable for the removal of perfluorocarboxylic acids from surface water, groundwater, or industrial wastewater, and has the advantages of simple operation, high efficiency, and good stability.

Provided are covalent organic frameworks (COFs). The COFs may be used to bind or capture perfluorinated compounds, such as, for example, perfluorooctanoic acid (PFOA). The COFs may assemble and form nanoparticles suitable in methods of the present disclosure. Additionally, COFs may be used as fluorescent indicators to detect perfluorinated compounds, or temperature and / or humidity. COFs of the present disclosure may have the following structure: (I) wherein each R is independently (II) or (III) and each R' is independently (IV) or (V) wherein at least one R is (VI) or (VII) wherein each R is independently (VIII) or (IX) each R' is independently (X) or (XI) wherein at least one R is (XII).

The present application belongs to the field of biological remediation of perfluorooctanoic acid and its salt and related compounds, and particularly relates to a facultative anaerobic iron-reducing bacteria and its application in treating new pollutants (perfluorooctanoic acid and its salt and related compound pollution) in contaminated soil and water. The facultative anaerobic iron-reducing bacteria (Clostridium diolis) FLP22 has been preserved in China Center for Type Culture Collection on November 21, 2023, and the preservation registration number is CCTCC NO: M 20232292. The strain is suitable for metabolic degradation of PFOA in soil and water under aerobic conditions and anaerobic conditions. Therefore, the strain has the ability to completely mineralize and degrade PFOA in soil and water and reduce the toxicity of the environmental medium.

The utility model discloses integrated equipment for deeply treating perfluorooctanoic acid wastewater, and relates to the technical field of wastewater treatment. Ultraviolet light catalysis, electric flocculation and adsorption technologies are integrated, so that three-stage synergistic purification of the perfluorooctanoic acid wastewater is realized, and organic fluorine and generated inorganic fluorine ions can be synchronously removed and degraded. The equipment comprises an ultraviolet light catalytic reaction device, an electric flocculation device and an adsorption device, an inlet of the electric flocculation device is communicated with an outlet of the ultraviolet light catalytic reaction device, and an outlet of the electric flocculation device is communicated with an inlet of the adsorption device. The method is used for improving the performance of the perfluorooctanoic acid wastewater equipment.

The invention discloses a < 19 > F magnetic resonance imaging probe based on a water-dispersible perfluorinated compound as well as a preparation method and application of the < 19 > F magnetic resonance imaging probe, and the preparation method comprises the following steps: dissolving the perfluorinated compound, 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide in dichloromethane to react to obtain a mixture solution; dissolving amino polyethylene glycol monomethyl ether in dichloromethane, dropwise adding the solution into the mixture solution for continuous reaction, removing the solvent under reduced pressure after the reaction is finished, dialyzing a crude product in deionized water, and freeze-drying to obtain a white solid, namely the amino polyethylene glycol monomethyl ether. The < 19 > F magnetic resonance imaging probe based on the water-dispersible perfluorinated compound is obtained by dissolving the water-dispersible perfluorinated compound in deionized water and performing ultrasonic treatment; wherein the perfluorinated compound comprises one or more of perfluoro caprylic acid, perfluoro hexanoic acid and perfluoro tetradecanoic acid. Excellent in-vivo application prospects are realized.

The invention discloses a method for removing perfluorinated compounds by using magnetic rotor enhanced ultrasound. After a magnetic rotor is added into a perfluorooctanoic acid solution, ultrasound is started to complete removal of perfluorooctanoic acid. According to the method, the magnetic rotor in a laboratory environment is used as a contact electrocatalyst, and the method shows good potential for efficiently removing perfluorides in a water body under the action of high-frequency ultrasonic enhancement. Compared with a conventional degradation method, the method does not need to additionally add a catalyst and an oxidizing agent which are complex in preparation. The method provided by the invention is simple to operate, low in energy consumption, low in cost, obvious in pollutant removal effect, green and environment-friendly.

The invention discloses a method and device for synergistically treating new pollutants through multi-source catalysis coupling adsorption, and the method comprises the following steps: dispersing graphene oxide in an aqueous solution, then adding ferric salt, copper salt and cerium salt, and dissolving the ferric salt, the copper salt and the cerium salt to obtain a mixed solution; the preparation method comprises the following steps: dipping pretreated granular active carbon in a mixed solution, stirring, filtering, drying, calcining, and finally cooling and washing to obtain the modified active carbon adsorption filler, placing the modified activated carbon adsorption filler in a reactor comprising an anode and a cathode; the method comprises the following steps: adding electrolyte into a reactor, introducing wastewater containing new pollutants into the reactor, electrifying and controlling the current density to be a preset value to complete pollutant treatment; wherein the new pollutants comprise perfluorooctanoic acid, tributyl phosphate and tris (2-chloroethyl) phosphate. The method can achieve the synergistic treatment effect on various new pollutants, is easy to operate and low in operation cost, and has a good application prospect.

The invention relates to a fluorine-functionalized covalent organic polymer as well as a preparation method and application thereof, and the preparation method comprises the following steps: adding hexafluorobisphenol A and tert-butyldimethylsilyl chloride into a first organic solvent, and carrying out substitution reaction under the action of a first catalyst to obtain a phosphorus-fluorine exchange monomer BPSF-OTBS; and mixing a phosphorus-fluorine exchange monomer BPSF-OTBS, hexafluorocyclotriphosphazene and a second organic solvent, and carrying out polymerization reaction under the action of a second catalyst to obtain the fluorine functionalized covalent organic polymer. The fluorine functionalized covalent organic polymer is prepared by taking hexafluorobisphenol A as a main raw material through a substitution reaction and a polymerization reaction, F atoms are introduced into the covalent organic polymer through hexafluorobisphenol A, and perfluorooctanoic acid is adsorbed through fluorine and fluorine interaction, so that the fluorine functionalized covalent organic polymer has an adsorption effect on perfluorooctanoic acid, can be used for removing perfluorooctanoic acid in waste water, and can be used for removing the perfluorooctanoic acid in waste water. The adsorption capacity and the adsorption efficiency are high.

Disclosed herein are aspects of a composition for detecting environmental toxicants such as, but not limited to, perfluorinated-alkyl substance, perfluorooctanoic acid, and the like. The composition allows for the rapid, sensitive detection of perfluorinated-alkyl substances (PFAS) by utilizing the competitive interactions during capillary action. The composition comprising one or more cellulose fibers; and one or more biomolecules associated with the one or more cellulose fibers, wherein the composition is configured so that when the composition contacts the liquid sample, the one or more biomolecules disassociate from the one or more cellulose fibers by interacting with the one or more environmental toxicants thereby decreasing the flow of the liquid sample comprising one or more environmental toxicants. A system for using the composition is also disclosed along with a method of using the paper microfluidic chips and a method making the paper microfluidic chip.

The invention relates to the technical field of photocatalysis of water treatment, and discloses a BiOCl / CeO2 heterojunction photocatalyst with a double-electric-field coupling effect as well as a preparation method and application of the BiOCl / CeO2 heterojunction photocatalyst. The preparation method comprises the following steps: firstly, synthesizing a BiOCl nanosheet with an exposed (001) crystal face through a hydrothermal method; then loading CeO2 nanoparticles on BiOCl by adopting a chemical deposition method to form a heterojunction; and introducing surface oxygen vacancies through illumination treatment to obtain the catalyst. By regulating and controlling the exposed crystal face of BiOCl, a bulk phase self-generated electric field (SIEF) of BiOCl is mutually coupled with a heterojunction interface electric field (IIEF), the SIEF drives bulk phase photo-generated electrons to directionally migrate to an interface, and the IIEF promotes interface charge separation, so that bulk phase and interface compounding of photo-generated carriers is synergistically inhibited; the catalyst shows excellent photocatalytic degradation performance on perfluorooctanoic acid (PFOA) in water, the defluorination rate can reach 30.59%, the activity is kept above 90% after the catalyst is recycled for 4 times, and an efficient and stable solution is provided for deep removal of persistent organic pollutants.

The invention belongs to the field of preparation of wave-absorbing materials, and relates to a high-activity 0D / 2D crystal face co-exposed Bi0 / Bi4NbO8Cl microwave (MW) absorbing material as well as a preparation method and application thereof. The crystal face co-exposed flaky Bi0 / Bi4NbO8Cl wave-absorbing material is a 0D / 2D Bi0 / Bi4NbO8Cl Schottky junction wave-absorbing material with high-activity crystal faces {001} and {110} which are co-exposed. According to the invention, Bi4NbO8Cl is modified through a crystal face engineering technology, and a 2D sheet structure with exposed {001} and {110} high-activity crystal faces is generated. And carrying out hydrothermal treatment to enable 0D semimetal Bi0 to grow on the surface in situ, so as to obtain the 2D flaky Bi0 / Bi4NbO8Cl binary composite MW absorbing material with high-activity {001} and {110} crystal faces co-exposed. Under MW driving, the material shows ultrahigh catalytic degradation activity on PFOA, and has potential application prospects in the aspect of purification of environmental water bodies polluted by PFAS.

The invention relates to the technical field of environment detection and pollution treatment, in particular to a magnetic nano-enzyme composite material capable of detecting and removing perfluorooctanoic acid (PFOA) and a preparation method of the magnetic nano-enzyme composite material capable of detecting and removing the perfluorooctanoic acid (PFOA). Different signal transduction is caused by a masking effect on a nano-enzyme catalysis site in an adsorption process, so that high-sensitivity multi-mode detection of PFOA is realized; meanwhile, the composite material adsorbed with the PFOA is rapidly separated and the PFOA is effectively degraded by virtue of a magnetic separation technology and the catalytic property of the nano-enzyme, so that the synchronous detection and removal of the PFOA in the water body are realized. The composite material is environment-friendly in preparation process, simple to operate, high in yield, wide in detection linear range (0-300 mu M), good in selectivity and high in removal efficiency, solves the technical problems that PFOA detection operation is complicated, equipment is expensive and detection and removal cannot be synchronously realized in the prior art, and has important practical application value.

The invention discloses nano-modified solder mask ink for an SLP (selective laser bonding) carrier plate and a preparation method of the nano-modified solder mask ink, and belongs to the technical field of new materials. Aiming at the problems of insufficient adhesive force, poor heat resistance, poor chemical resistance, low development resolution and the like of the existing solder mask ink in the manufacturing of SLP (selective laser bonding) type support plates, a composite nano filler is formed by silane coupling agent modified nano silicon dioxide, a copper-containing MOF (metal organic framework) seed crystal and a two-dimensional transition metal carbide lamella; in combination with a photoinitiator compound, trimethylolpropane triacrylate, perfluorooctanoic acid and other functional aids, an ultrasonic dispersion and magnetic field assisted directional curing process is adopted to form a multistage pore structure and an anisotropic cross-linked network. The adhesive force of the obtained printing ink reaches 5B, the printing ink is free of cracks after being subjected to thermal shock at 260 DEG C, the adhesive force of a sulfuric acid solution with the pH value of 3.5 is not reduced, the developing line width reaches 45-50 microns, and the requirements for high precision and high reliability of SLP type carrier plates are met. The preparation method is simple in process, compatible with the existing process, environment-friendly and economic, and suitable for the field of high-end electronic manufacturing.

This invention discloses a field-effect transistor sensor based on titanium carbide MXene / MIP, its fabrication method, and its application, belonging to the field of chemical sensor technology. The sensor includes a substrate, a transistor, and a sensing electrode. The sensing electrode is connected to the transistor gate via a wire, and its surface is sequentially modified with a titanium carbide MXene layer and a molecularly imprinted polymer layer targeting perfluorooctanoic acid (PFOA). The fabrication method includes: preparing an MXene dispersion by etching using a LiF / HCl system, drop-coating it onto a conductive substrate, electropolymerizing it using PFOA as a template to form a MIP layer, and finally assembling it with the transistor. This invention utilizes the high conductivity of MXene and the specific recognition capability of MIP to convert the interfacial potential change caused by PFOA binding into a significant drain current change through a solution gate control mechanism. This sensor is simple to fabricate, low in cost, and has good stability, enabling highly sensitive and specific detection of trace amounts of PFOA in aqueous solutions, and is suitable for on-site environmental monitoring.

The present invention provides a sludge-based organic matter coupled with perfluorooctanoic acid coated nano-aluminum powder and a preparation method and application thereof, belonging to the technical field of material modification. The present invention first utilizes sludge-based organic matter rich in protein and polysaccharide to coat nano-aluminum powder in an aqueous solution to obtain nano-aluminum powder particles coated with a sludge-based organic interface layer, and then mixes the nano-aluminum powder particles coated with the sludge-based organic interface layer with a perfluorooctanoic acid solution and coats them during a heating and ultrasonic treatment process to obtain sludge-based organic matter coupled with perfluorooctanoic acid coated nano-aluminum powder. The sludge-based organic matter coupled with perfluorooctanoic acid coated nano-aluminum powder effectively coats the sludge-based organic matter interface layer in an aqueous solution and is successfully doped with fluorine element, which can theoretically effectively improve the combustion performance of the nano-aluminum powder. The method is simple and easy to operate and is more convenient for industrial application.

The present invention provides a water-repellent woven or knitted article that overcomes the problems of the related art and exhibits water-repellent properties and is excellent in abrasion resistance and durability. The water-repellent woven or knitted article of the present invention is a woven or knitted article subjected to a water repellent treatment using a water repellent having a perfluorooctanoic acid (PFOA) concentration of 5 ng / g or less, wherein the woven or knitted article includes, as constituent fibers, fibers having a transverse cross-sectional shape, each fiber has a plurality of grooves at an outer circumference of the transverse cross section, each groove has a wide part, and a size of the grooves in the fibers satisfies the following Formulae (Formula 1) and (Formula 2):w2 / w1≥1.3  (Formula 1)0.15≤h / d≤0.25  (Formula 2)where w1 represents a groove entrance width, w2 represents a groove wide part width, h represents a groove depth, and d represents a diameter of the fiber,a droplet contact angle between the woven or knitted article and water is 135° or more after 20 times of washing in accordance with a method of JIS L 0217 103 and a water repellency is grade 4 or more in accordance with a spray method of JIS L 1092.