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211 results about "Pentachlorophenol" patented technology

Pentachlorophenol (PCP) is an organochlorine compound used as a pesticide and a disinfectant. First produced in the 1930s, it is marketed under many trade names. It can be found as pure PCP, or as the sodium salt of PCP, the latter which dissolves easily in water. It can be biodegraded by some bacteria, including Sphingobium chlorophenolicum.

Preparation method and application of sodium alginate microspheres

The invention discloses a preparation method and application of sodium alginate microspheres. After reeds are washed, dried in air and crushed, reed powder is placed in a 600 DEG C muffle furnace (the environment is full of N2) to be subjected to pyrolysis for 2 h, after being cooled, the reed power is sieved through a 100-mesh sieve, and reed biochar is obtained after the reed powder is subjected to chlorohydric acid pickling. Meanwhile, sodium alginate is dissolved in deionized water to be prepared into a 4% sodium alginate solution. A 20g/L reed biochar aqueous solution and the sodium alginate solution are evenly mixed according to the volume ratio of 1:1, a mixed solution is dropped into a CaCl2 solution through a peristaltic pump, and reed biochar-sodium alginate microsphere adsorption materials are made. The sodium alginate microspheres are environment-friendly materials and low in cost, the preparation method is simple and easy to implement, specifications are uniform, the sodium alginate microspheres have a good adsorption effect on pentachlorophenol (PCP) and phenanthrene (Phe) and are easy to recycle and high in acid and alkali resistance. The preparation method can be used for waste water treatment and can also be used as growing carriers of microorganisms, algae and the like.
Owner:OCEAN UNIV OF CHINA

Preparation method and application of polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode

The invention relates to a preparation method and an application of a polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode and belongs to the technical field of electrochemical water treatment. The method comprises the following steps of: firstly ultrasonically dispersing carbon nanotubes after being pretreated into a volatile organic solvent to form carbon nanotube suspension liquid, soaking and lifting a Ti (titanium) net in the suspension liquid, and naturally drying the Ti net to ensure that the carbon nanotubes are dispersed on the surface of the Ti net; carrying out the electrochemical oxidization polymerization in a Py (polypyrrole) sulfuric acid solution to form polypyrrole, so as to obtain a polypyrrole-multiwalled nanotube modified membrane; finally electrically depositing Pd (palladium) in a PdCl2 solution to obtain the polypyrrole-multiwalled carbon nanotube-modified Pd-carried composite electrode. The electrode is used for electrically catalyzing and reducing chloride of chlorophenol in the water. Compared with a Pd/Ti electrode with no modified layer, the research shows that the electrode can rapidly and high-efficiently remove 2, 4-dichlorophen and pentachlorophenol and has universality. The prepared electrode is high in catalytic activity, good in stability, rapid and high-efficient for electrically catalyzing the chlorophenol in the water and promising in application prospect.
Owner:BEIJING UNIV OF TECH

Bismuth iron niobium-based composite magnetic particle photocatalyst with core-shell structure, preparation and application of bismuth iron niobium-based composite magnetic particle photocatalyst

The invention discloses a catalytic material with a core-shell structure, gamma-Fe2O3-Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1), SiO2-Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1), MnO-Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1); the particle size of gamma-Fe2O3, SiO2 and MnO is 0.06 to 2 microns, the particle size of core-coated Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1) is 0.08 to 1.2 microns; the application of the catalytic material with the core-shell structure includes that: a reaction system consisting of a magnetic field device and photocatalytic material with a core-shell structure is used for degrading pentachlorophenol, Atrazine, diuron, crystal violet and other organic pollutants in water, and the magnetic-field intensity is chosen to be from 0.5 to 5T, and a xenom lamp or a high voltage mercury lamp is used as a light source; the volume percents of the three magnetic composite photocatalytic materials are all 1/3 of volume ratio so that the magnetic composite photocatalytic materials can be distributed in aqueous solution uniformly, and oxygenation and aeration are simultaneously adopted; the entire photoreaction is implemented under airtight and light-tight environment. Novel catalyst is loaded on a magnetic particle core through a multi-target magnetron sputtering deposition method, a pulse laser sputtering deposition method or a metal organic substance chemical vapor deposition method.
Owner:NANJING UNIV

Niobium bismuth yttrium-based composite magnetic particle photocatalysts with core-shell structures as well as preparation methods and applications thereof

The invention discloses catalytic materials with core-shell structures, i.e., gamma-Fe2O3-Y3-xBixNbO7 (0.5<=x<=1), SiO2-Y3-xBixNbO7 (0.5<=x<=1), and MnO-Y3-xBixNbO7 (0.5<=x<=1), wherein the particle size of gamma-Fe2O3, SiO2 and MnO is 0.06-2 microns, and the particle size of core-coated Y3-xBixNbO7 (0.5<=x<=1) is 0.08-1.2 microns; the applications of the catalytic materials with core-shell structures are as follows: a reaction system consisting of a magnetic field device and photocatalytic materials with core-shell structures is used for degrading pentachlorophenol, Atrazine, diuron, crystal violet and other organic pollutants, and the magnetic-field intensity is chosen to be from 0.5T to 5T, and a xenom lamp or a high voltage mercury lamp is used as a light source; the volume percents of the three magnetic composite photocatalytic materials are all 1 / 3 in volume ratio so that the magnetic composite photocatalytic materials can be distributed in an aqueous solution uniformly, an edge filter ((lambda) 420nm) is adopted and oxygenation and aeration are simultaneously adopted. A novel catalyst is loaded on a magnetic particle core through a multi-target magnetron sputtering deposition method or metal organic substance chemical vapor deposition method. Y3-xBixNbO7 (0.5<=x<=1) powder is used as a catalyst or Pt, NiO and RuO2 catalysts are loaded respectively.
Owner:NANJING UNIV

Method for determination of residual quantity of pentachlorophenol in eggs and egg products

InactiveCN107632080AOvercoming the problem of low extraction recoveryOvercome PurificationComponent separationPentachlorophenolHuman health
A method for determination of the residual quantity of pentachlorophenol in eggs and egg products is characterized by comprising the steps: taking 1.0-5.0 g of a homogeneous sample in a 10 mL polypropylene centrifugal tube, adding 5-15 mL of an acetonitrile-water solution containing 5.0%-10.0% (V/V) of triethylamine, carrying out ultrasonic extraction and centrifugal separation, purifying the supernatant via a small mixed anion exchange column (6 mL), leaching with a methanol/water solution (50/50, V/V) containing 1.0%-5.0% (V/V) of formic acid, carrying out graded elution with a methanol solution containing 6.0%-15.0% (V/V) of formic acid, blowing the elution solution with nitrogen with the temperature of 40 DEG C to nearly dry, and redissolving with methanol for liquid chromatography tandem mass spectrometric determination. The method has the advantages of simple process, convenient and fast operation, good enrichment efficiency, high extraction recovery rate, low price, and good detection sensitivity and precision, is suitable for analysis of the residual quantity of pentachlorophenol in the eggs and the egg products, and has great significance on control of the residual quantity of pentachlorophenol in the eggs and the egg products and ensuring of food safety and human health.
Owner:NINGBO MUNICIPAL CENT FOR DISEASE CONTROL & PREVENTION

Measurement method for residual amount of pentachlorophenol in cigarette paper

A measurement method for the residual amount of pentachlorophenol in cigarette paper is characterized by comprising the following steps: cutting cigarette paper into pieces, adding extract liquor into the pieces, conducting ultrasonic extraction and measuring the residual amount of pentachlorophenol in the cigarette paper with liquid chromatography-tandem mass spectrometry (LC-MS / MS) directly after centrifugation of the extract liquor. The method comprises the following steps: a. cutting a cigarette paper sample according to relevant regulations; b. extracting a sample; c. purifying the sample; d. preparing a standard operating solution; e. carrying out liquid chromatography-tandem mass spectrometry (LC-MS / MS) measurement; f. calculating the measured result of the residual amount of pentachlorophenol. In comparison with the prior art, the measurement method has the following advantages: 1. adopting a pre-treatment of cutting the sample to make a solvent contact the sample better. The experiment result shows that such treatment can help to increase the extraction efficiency of pentachlorophenol. 2. measuring the content of pentachlorophenol in the paper with LC-MS / MS without derivatization operation, and the pre-treatment method is simple. 3. The method is accurate in operations, high in sensitivity and good in repeatability.
Owner:CHINA NAT TOBACCO QUALITY SUPERVISION & TEST CENT
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