9 results about "Perfluorooctane" patented technology

This invention provides a set of metabolic biomarkers for assessing perfluorooctane sulfonate (PFOS) exposure levels and their applications, belonging to the field of organic pollutant poisoning detection technology. Utilizing plasma sample metabolomics data and machine learning algorithms, this invention successfully constructs a discriminant model capable of accurately distinguishing between high PFOS exposure (above 20 ng / mL) and low exposure (not exceeding 20 ng / mL). This method is simple to operate, non-invasive, and the sample collection process is quick and easy, making it particularly suitable for large-scale PFOS high exposure risk screening in populations. It eliminates the need for PFOS standards, avoiding potential contamination risks.

This invention provides a high-temperature stable fluorinated carbon oil displacement surfactant and its preparation method, belonging to the field of surfactant technology. This application constructs a triazine fluorinated surfactant: First, 1H,1H,2H,2H-perfluorooctane-1-ol is used in the presence of anhydrous potassium carbonate to generate a fluorinated alkoxy anion, which forms a C-O bond with cyanuric chloride, introducing a fluorinated hydrophobic arm; then, sodium N-methyltaurate is introduced to N-substitute the unsubstituted chlorine position, introducing a sulfonate hydrophilic head group, obtaining an intermediate of a fluorinated hydrophobic arm and a taurine hydrophilic arm; then, oleylamine is used to replace the remaining chlorine position, introducing a long-chain hydrocarbon hydrophobic arm, forming a surfactant mixture with an O-N-N triazine structure consisting of a "fluorinated alkoxy arm-taurine hydrophilic arm-oleylamine hydrocarbon arm"; after solvent removal and addition to an ethylene glycol monobutyl ether / water co-solvent system, a stable oil displacement surfactant that is easy to prepare and use on-site is obtained.

The invention discloses a white peroxidase simulant manganese-based metal organic framework (Mn-MOF) as well as a preparation method and application thereof, and belongs to the technical field of nano materials and detection. The Mn-MOF is prepared by reacting manganese acetate tetrahydrate with 1, 3, 5-benzene tricarboxylic acid in an ethanol-water mixed system, is of a white three-dimensional microsphere structure, and has excellent simulated peroxidase activity. The perfluorooctane sulfonate can catalyze H2O2-mediated TMB chromogenic reaction, and perfluorooctane sulfonate (PFOS) can inhibit the catalytic activity of the perfluorooctane sulfonate (PFOS) through multiple interactions, so that the blue color of the solution becomes light. The change of absorbance is detected by using an ultraviolet spectrophotometer, or a color developing image is converted into an RGB value through a smart phone and an R / B ratio is calculated, so that high-selectivity, visual and rapid detection of the PFOS can be realized. The method does not need complex pretreatment, is simple and convenient to operate and low in cost, has the detection limit as low as 53.3 nM, and is suitable for quantitative analysis of PFOS in a field environment water sample.

The invention relates to the technical field of environmental monitoring, and discloses a method and a system for detecting perfluorooctane sulfonic acid in water. The method comprises the following steps: exciting a fluorocarbon bond vibration mode of perfluorooctane sulfonate molecules in a water sample to be detected by using laser with a specific wavelength, inducing nonlinear transition of instantaneous refractive indexes of the molecules, and obtaining a preliminary optical response signal sequence; extracting a matrix scattering background light intensity fluctuation range and a peak-valley contrast ratio of the signal sequence, and determining a transition amplitude enhancement threshold; when the threshold value exceeds the background range, capturing an instantaneous transition image and processing the instantaneous transition image to obtain a multi-frame difference signal sequence; extracting sequence characteristic parameters, matching the sequence characteristic parameters with a preset response mode, and determining molecular aggregation state configuration characteristics; and through multi-wavelength spectrum fusion verification, ecological threat assessment and signal enhancement processing, a trace concentration quantitative result is obtained. According to the invention, through laser targeting excitation and multi-dimensional feature fusion, the problems of weak trace detection signal, large interference and poor specificity in a complex matrix are solved, and the detection sensitivity and accuracy are improved.

The application provides a high-temperature stable fluorocarbon oil displacement surfactant and a preparation method thereof, and belongs to the technical field of surfactants. A triazine fluorine-containing surfactant is constructed. First, 1H, 1H, 2H, 2H-perfluorooctane-1-alcohol is used to generate a fluorine-containing alkoxy anion under the action of anhydrous potassium carbonate, and a C-O bond is formed with cyanuric chloride to introduce a fluorine-containing hydrophobic arm. Then, N-methyl taurine sodium is introduced to perform N-substitution on the unsubstituted chlorine site, and a sulfonate hydrophilic head group is introduced to obtain a fluorine-containing hydrophobic arm and taurine sulfonate hydrophilic arm intermediate. Then, the remaining chlorine site is substituted with oleylamine to introduce a long-chain carbon and hydrogen hydrophobic arm, forming a surfactant mixture with an O-N-N triazine structure composed of a fluorine-containing alkoxy arm-taurine sulfonate hydrophilic arm-oleylamine carbon and hydrogen arm. After solvent removal and the addition of ethylene glycol monobutyl ether / water auxiliary solubilization system, an oil displacement surfactant with stable morphology and convenient on-site preparation and use is prepared.

The invention relates to the technical field of separation membranes, and discloses a cationic nano titanium dioxide modified nanofiltration membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: blending polyether sulfone, polyethylene glycol, nano titanium dioxide and N, N-dimethylformamide to form a membrane casting solution, forming an ultrafiltration base membrane through a water coagulating bath, and then sequentially carrying out full infiltration and heat treatment in a piperazine-containing water phase and a TMC-containing organic phase to obtain the modified nanofiltration membrane. And finally, soaking in a water solution of Na < + >, Mg < 2 + > and Fe < 3 + > cations, and drying to obtain the target nanofiltration membrane. The nanofiltration membrane prepared by the invention is wide in application scene, and is suitable for efficiently removing typical PFOS (perfluorooctane sulfonate) in a concentration range (10-1000 mu g / L) from a near-neutral actual water source; non-toxic and cheap cations (Na < + > / Mg < 2 + > / Fe < 3 + >) are used, so that secondary pollution is avoided, and meanwhile, the membrane has high rejection rate and high flux; long-chain PFAS resistance specificity: a membrane structure (MWCO matching + high negative electricity + bridging) is customized aiming at molecular size, charge and hydrophobicity of PFOS (C8), and is superior to most studies focusing short-chain PFAS.

The application provides an anti-icing coating and a preparation method and application thereof, and belongs to the technical field of anti-icing coatings. The anti-icing coating is optimized, the synergistic effect of (4-perfluorooctylphenyl) triethoxysilane, hexafluorobutyl methacrylate and hexamethylene diisocyanate is utilized, the water contact angle of the anti-icing coating can be greatly improved, the hydrophobic property is improved, and good anti-icing effect is achieved; the micron-nanometer concave-convex structure is formed on the surface of the coating layer formed by the anti-icing coating by adding nanoscale hydrophobic particles, the self-cleaning effect of imitation lotus leaf is realized, the adhesion of water droplets, water mist and dirt on the surface is effectively prevented, and the occurrence of icing phenomenon is further prevented.

The invention discloses reinforced universal type degreased powder and a preparation process thereof, the reinforced universal type degreased powder comprises a basic carrier material and a functional component material, the basic carrier material comprises anhydrous sodium sulfate and sodium bicarbonate, and the functional component material comprises a surface active material, an enzymolysis degreasing material, an alkaline slow-release material, an oxidation carbon deposition treatment material and an auxiliary additive, the surface active material is prepared from rhamnolipid, APG (alkyl polyglucoside), PFBS (perfluorooctane sulfonate), polyether modified trisiloxane, cocamidopropyl betaine and polyoxyethylene lauryl ether. The whole degreasing powder can achieve targeted cracking of the pain point that stubborn oil stains are difficult to decompose, raw materials for sensitive characteristics of aluminum alloy / titanium alloy are optimized, and the degreasing powder which is thorough in stubborn oil stain degreasing, free of damage to sensitive materials, stable in long-term storage, environmentally friendly and compliant is achieved; through the preparation process of double-enzyme coating, silicon-based cooperation and double-cavity isolation, an efficient, safe and stable brand-new solution is provided for degreasing of the metal precision component.

The invention belongs to the technical field of detection and analysis, and particularly relates to a colloidal gold test strip and kit for quantitatively detecting perfluorooctane sulfonic acid (FPOS) in water and a use method of the colloidal gold test strip and kit. The colloidal gold test strip and the kit based on the special monoclonal antibody are innovatively researched and developed, the monoclonal antibody has a unique gene sequence, and the detection sensitivity of PFOS is remarkably improved. When the test strip is used, a sample to be detected only needs to be dropwise added on the sample pad of the test strip, the sample moves towards the water absorption pad under the capillary action, and the sample interacts with a colloidal gold marker when flowing through the colloidal gold pad. Compared with traditional instrument detection, the colloidal gold immunochromatography technology does not need professional operation and complex equipment, the detection process is simple, convenient and rapid, high sensitivity is kept, the content detection of PFOS in water can be rapidly completed on site, and the method is suitable for large-scale popularization and application. And an efficient and practical new scheme is provided for public health emergency event monitoring, pollutant environment risk assessment and management, food safety supervision and enterprise self-inspection.