12 results about "Dodecyltrimethylammonium bromide" patented technology

The application belongs to the technical field of contaminated soil remediation, and particularly relates to modified montmorillonite for synergistically remediating heavy metals and organic pollutants in soil as well as a preparation method and application thereof. Hexadecyl trimethyl ammonium bromide (CTAB) and dodecyl trimethyl ammonium bromide (DTAB) are used as modifiers to prepare organic modified montmorillonite, and mercury ions (Hg 2+ ) and acetochlor (ACR) are used as representative substances of heavy metals and organic pollutants to study the effects of the two kinds of organic modified montmorillonite on remediation of Hg 2+ and ACR compound contaminated soil. The results show that the two kinds of organic modified montmorillonite have good removal effects on Hg 2+ and ACR in real soil samples, and can simultaneously remove Hg 2+ and ACR in soil. The removal rates of CTAB modified montmorillonite and DTAB modified montmorillonite can both reach more than 90%. The organic modified montmorillonite prepared by using CTAB and DTAB as modifiers can simultaneously remove Hg 2+ and ACR in soil, and can synergistically remediate Hg 2+ and ACR compound contaminated soil.

The invention discloses a preparation method of a superfine PtIr nanowire catalyst for ammoxidation. The preparation method comprises the following steps: firstly, fully dissolving platinum acetylacetonate, iridium acetylacetonate, tungsten hexacarbonyl and dodecyl trimethyl ammonium bromide in oleylamine to obtain a light yellow solution; carrying out ultrasonic treatment on the obtained light yellow solution until the solution is fully dissolved; and heating the obtained uniform light yellow solution to 190 DEG C in an oil bath, keeping the temperature for 5 hours, centrifuging, washing and drying to obtain the superfine PtIr nanowire catalyst. The nanowire structure has a high specific surface area and abundant active sites, and is beneficial to effective quality and electron transmission. Through alloying of Ir and Pt, the electronic structure on the surface of the catalyst is changed, and the poisoning probability is effectively reduced. Meanwhile, the adsorption and activation process of ammonia molecules is optimized through the synergistic effect between Pt and Ir, the reaction activation energy is reduced, and the reaction rate is remarkably increased. The catalyst not only has remarkable ammonia oxidation catalytic performance, but also is good in stability and simple in preparation process.

The invention relates to the technical field of mineral separation, in particular to a method for synchronously removing silicon and magnesium impurities by reverse flotation of collophanite, which comprises the following steps of: grinding raw ore, and synchronously removing the silicon and magnesium impurities in the collophanite by adopting a closed-loop process comprising primary roughing, primary scavenging, secondary concentration, middling regrinding-concentration and primary fine scavenging; wherein a compound of amino trimethylene phosphonic acid and sodium ardronate is used as an inhibitor of collophanite; a compound of 11-aminoundecanoic acid, dodecyl trimethyl ammonium bromide and sodium oleate is adopted as a synchronous reverse flotation collecting agent of the magnesium-silicon gangue minerals; flotation is carried out in a weakly alkaline ore pulp system, and the pH value of ore pulp is 8-10. According to the method, silicon-calcium gangue minerals are subjected to synchronous reverse flotation by selectively inhibiting apatite-multi-component collecting agent under weak base.

The invention relates to the technical field of methane-hydrogen sulfide reforming, in particular to a preparation method and application of a molybdenum-based catalytic material for methane-hydrogen sulfide reforming. The preparation method comprises the following steps: S1, calcining nano gamma aluminum oxide; s2, treating the calcined nano gamma aluminum oxide with a sodium citrate solution; s3, the polystyrene microspheres are treated through dodecyl trimethyl ammonium bromide; s4, combining the nano gamma aluminum oxide treated in the step S2 with the polystyrene microspheres treated in the step S3; s5, adding ammonium molybdate tetrahydrate, metal salt and the nano gamma aluminum oxide assembled in the step S3 into deionized water to obtain a precursor; s6, calcining and grinding the precursor obtained in the step S5 to obtain a primary catalytic material; and S7, vulcanizing the primary catalytic material obtained in the step S6 to obtain the catalytic material. The catalytic material prepared in the invention has high activity and high methane conversion efficiency.

This invention provides a method for preparing composite whiskers of calcium sulfate and basic magnesium salt, belonging to the field of whisker preparation. The method includes: treating gypsum dihydrate, magnesium sulfate, and magnesium hydroxide into micron-sized powders; weighing gypsum powder, magnesium sulfate powder, magnesium hydroxide powder, water, a crystal form control agent, and an ion regulator; adding these to a high-temperature, high-pressure reactor for hydrothermal reaction to obtain crude composite whiskers; centrifuging, dehydration, washing, and drying to obtain composite whiskers of calcium sulfate and basic magnesium salt; the crystal form control agent is at least one of aluminum salt, dodecyltrimethylammonium bromide, and sodium dodecyl sulfonate; the ion regulator includes calcium ion regulating aids and magnesium ion regulating aids. This invention, through specific conditions and aids, enables calcium sulfate and basic magnesium salt to grow into composite whiskers under the same conditions. Their two different crystal states form a special "bridging" structure, thus exhibiting superior mechanical properties when used in polymer materials.

The invention discloses a cardiac troponin T calibrator diluent composition, a diluent, a calibrator as well as a preparation method and application of the calibrator. The composition comprises a basic diluent component, a potassium salt, a casein hydrolysate and dodecyl trimethyl ammonium bromide, and the mass ratio of the potassium salt to the casein hydrolysate to the dodecyl trimethyl ammonium bromide is (5-39): (1-20): (0.5-3). According to the provided cardiac troponin T calibrator diluent composition and diluent, by optimizing the variety and concentration in the formula, the stability of cardiac troponin T in a liquid state and a freeze-drying state is remarkably improved, adsorption and degradation of cardiac troponin T in a glass container are effectively inhibited, the cardiac troponin T can be stabilized in a room-temperature glass bottle, and the application range of the cardiac troponin T calibrator diluent composition is widened. And after redissolution, good concentration consistency is still maintained, and reliable stability guarantee is provided for preparation, freeze-drying and clinical detection of the cardiac troponin T calibrator.

The invention discloses a modified electrode for detecting perfluorooctane sulfonic acid in an electrogalvanizing solution and a preparation method thereof.The modified electrode comprises a working electrode, and the surface of the working electrode is modified with dodecyl trimethyl ammonium bromide-zirconium-based metal organic framework / praseodymium-based dynamic metal organic gel; the praseodymium-based dynamic metal organic gel forms a stable film layer on the surface of the electrode, the zirconium-based metal organic framework is combined with the praseodymium-based dynamic metal organic gel and is bridged with dodecyl trimethyl ammonium bromide, and the dodecyl trimethyl ammonium bromide is specifically combined with perfluorooctane sulfonic acid. According to the application, the dodecyltrimethylammonium bromide and the perfluorooctane sulfonic acid are specifically combined, the praseodymium-based dynamic metal organic gel is combined to enhance an initial electrochemical luminescence signal of a system, and the zirconium-based metal organic framework is used for improving the stability of an interface, so that the interference of coexisting ions in an electrogalvanizing solution is avoided; the accuracy and the reliability of perfluorooctane sulfonic acid detection are improved.

The application discloses a dodecyltrimethylammonium bromide doped manganese dioxide composite material and a preparation method and application thereof in a zinc ion battery. Dodecyltrimethylammonium bromide and manganese dioxide are added into isopropyl alcohol, stirred, the obtained mixed solution is moved into a reaction kettle, and a hydrothermal reaction is carried out, after the reaction is completed, the obtained product is vacuum dried, and the dodecyltrimethylammonium bromide doped manganese dioxide composite material is obtained. The dodecyltrimethylammonium bromide doped manganese dioxide composite material is applied to the zinc ion battery as a positive electrode material, and it can be concluded from electrochemical test that the dodecyltrimethylammonium bromide doped manganese dioxide positive electrode material has a higher specific capacity compared with original manganese dioxide. The synthesis process is simple, environment-friendly and low in price, and the dodecyltrimethylammonium bromide doped manganese dioxide composite material is expected to become a new type of energy storage device.

The application relates to the field of flame-retardant silicone rubber, and particularly discloses high-flame-retardant ceramifiable silicone rubber and a preparation method thereof. The high-flame-retardant ceramifiable silicone rubber comprises the following raw materials in parts by weight: 100 parts of silicone rubber, 10-20 parts of hydroxyl silicone oil, 5-10 parts of a vulcanizing agent, 20-40 parts of low-melting-point glass powder, 3-5 parts of a plasticizer, 2-7 parts of a coupling agent, 10-20 parts of a ceramifiable aid, 15-25 parts of white carbon black, 10-30 parts of modified expandable graphite, and 10-20 parts of hydrophobic modified silica aerogel; the silicone rubber comprises methyl vinyl silicone rubber and liquid silicone rubber at a mass ratio of 1:0.5; and the modified expandable graphite comprises expandable graphite, halloysite, dodecyltrimethylammonium bromide and cetyltrimethylammonium bromide at a mass ratio of 10:1-2:0.1-0.2:0.1-0.2. The ceramifiable silicone rubber disclosed by the application has good high-temperature resistance, strong flame-retardant capacity and high ceramic strength.

This invention discloses an amphiphilic phenolic network nanosphere, its preparation method, and its applications. The nanospheres possess an intrinsically amphiphilic topology of a hydrophobic aromatic network core and a hydrophilic hydroxyl-rich shell, and are monodisperse spherical particles with dodecyltrimethylammonium bromide anchored on their surface. This invention also provides a one-step aqueous synthesis method, achieving precise size control through the introduction of phase separation and interface modifiers. The synergistic dispersion system formed by the nanospheres and sodium fatty alcohol polyoxyethylene ether sulfate is stably dispersed in a high-salt environment (>10,000 mg / L), with an oil-water interfacial tension as low as 1.03 mN / m, capable of reversing oil-wetted core surfaces to water-wetted surfaces (contact angle ≤70°). The nanospheres of this invention can spontaneously adsorb at the oil-water interface and self-assemble under the Marangoni effect to form a high-strength particle-reinforced interfacial film. This invention provides new materials and methods for efficient oil recovery in complex reservoirs.

The invention discloses a nano-modified fracturing fluid thickening agent as well as a preparation method and application thereof, and belongs to the technical field of oil and gas field fracturing fluid additives. According to the thickening agent, a hydrophobic monomer is grafted on the basis of conventional polyacrylamide, hydrophobic associated polyacrylamide is synthesized from acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N-12-(2-buteneyloxy) n-dodecyl-N, N, N-trimethyl ammonium bromide and 4-(3-butene-1-yl) benzoic acid, and the hydrophobic associated polyacrylamide is added into the thickening agent. And the modified nano silicon dioxide is introduced to further enhance the mechanical property of the hydrophobic associated polyacrylamide. The nano-modified fracturing fluid thickening agent prepared by the preparation method disclosed by the invention is high in solubility and good in temperature resistance, shear resistance, viscoelasticity and thixotropy, and the nano-modified fracturing fluid thickening agent disclosed by the invention is used for being added into a fracturing fluid in proportion and is suitable for being used as an additive to improve the performance of the fracturing fluid.

This invention discloses a surfactant-based composite leaching agent for weathered crust leached rare earth ores. It is a composite solution formed primarily from a composite cationic surfactant and an inorganic leaching agent solution. The composite cationic surfactant is composed of hexadecyltrimethylammonium bromide and dodecyltrimethylammonium bromide. This surfactant-based composite leaching agent effectively increases the penetration rate of the leaching agent solution into the ore body, increases the leaching rate of rare earth elements, inhibits the leaching of aluminum impurities, and suppresses the expansion of the ore body, thus maximizing the leaching process of rare earth elements. Furthermore, the application method is simple, efficient, and suitable for widespread application.