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5 results about "Perfluorooctanoic acid" patented technology
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Perfluorooctanoic acid (PFOA) (conjugate base perfluorooctanoate)—also known as C8—is a perfluorinated carboxylic acid produced and used worldwide as an industrial surfactant in chemical processes and as a material feedstock, and is a health concern and subject to regulatory action and voluntary industrial phase-outs. PFOA is considered a surfactant, or fluorosurfactant, due to its chemical structure consisting of a perfluorinated, n-octyl "tail group" and a carboxylate "head group". The head group can be described as hydrophilic while the fluorocarbon tail is both hydrophobic and lipophobic; The tail group is inert and does not interact strongly with polar or non-polar chemical moieties; the head group is reactive and interacts strongly with polar groups, specifically water. The "tail" is hydrophobic due to being non-polar and lipophobic because fluorocarbons are less susceptible to the London dispersion force than hydrocarbons.
Systems for catalytically removing oxidized contaminants from a fluid and related methods
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.
Owner:THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA
A microwave absorbing material based on electrostatic self-assembly of δ-MnO2@Bi5O7I, its preparation method, and its application in the catalytic defluorination of perfluorooctanoic acid.
PendingCN122441462AEnvironment waterPerfluorooctanoic acid
The application belongs to the field of preparation of heterojunction wave-absorbing materials and treatment of environmental pollutants, and relates to a kind of δ-MnO2@Bi5O7I wave-absorbing material based on electrostatic self-assembly and its preparation method and application in catalytic perfluorooctanoic acid defluorination. In the δ-MnO2@Bi5O7I wave-absorbing material, δ-MnO2 accounts for 7% to 15% of the total mass of the wave-absorbing material. Under the cooperation of MW driving, the material shows ultra-high catalytic degradation activity to PFOA, and has potential application prospect in the purification of perfluoroalkyl compound contaminated environmental water.
Owner:LIAONING UNIVERSITY
A method for detecting perfluorooctanoic acid in water
PendingCN122306994ASpike recoveryUv detector
This invention relates to the field of detection and analysis technology, and discloses a method for detecting perfluorooctanoic acid (PFOA) in water. The method includes the following steps: filtering a water sample through a filter membrane and collecting the filtrate; using a C18 reversed-phase chromatographic column, with an aqueous solution containing tetrabutylammonium bisulfate as mobile phase A and acetonitrile as mobile phase B, isocratic elution is performed at a detection wavelength of 208-215 nm, and detection is performed using a UV detector or a diode array detector; qualitative analysis is performed based on chromatographic retention time, and quantitative analysis is performed using the external standard method based on chromatographic peak area. This invention, by optimizing the detection wavelength and introducing tetrabutylammonium bisulfate as an ion-pairing reagent, effectively improves the chromatographic peak shape and resolution of PFOA, achieving a correlation coefficient R0 within a wide linear range of 0.5-200 mg / L. 2 The detection limit is >0.999, which meets the detection requirements of most water bodies; the method has good repeatability, with a spiked recovery rate of up to 98.30%-108.35% in complex matrices; it has strong anti-interference ability, and the detection results are stable in the pH range of 4-10, making it suitable for actual water samples under different acid and alkaline conditions.
Owner:SOUTH CHINA NORMAL UNIV