84 results about "Hexadecyltrimethylammonium bromide" patented technology

The present invention is a preparation method of gold nanorods whose length-to-diameter ratio can be adjusted in a large range. The strong reducing agent sodium borohydride reduces tetrachloroauric acid to obtain gold seed solution; the preparation of growth solution: prepare the mixed solution of hexadecyltrimethylammonium bromide, tetrachloroauric acid and silver nitrate, and the mol ratio of the three is 20:1:0.1~20:1:5, add crotonic acid solution to obtain a growth solution; growth of gold nanorods: inject gold seed solution into the growth solution, react for 6-12 hours, and obtain gold nanorods. The invention adopts crotonic acid as growth solution modifier, and solves the biological toxicity and biological modification problems caused by CTAB. The yield of the short-length-diameter ratio gold nanorods prepared can be as high as about 90%, the size distribution is narrow, and the length-diameter ratio is about 1.92. The aspect ratio of the prepared gold nanorods can be adjusted in a wide range from 1.9 to 7.5.

The invention discloses a modified zeolite organic matter composite agent for synchronous nitrogen and phosphorus removal of sewage, and a preparation method, application and an application method of the modified zeolite organic matter composite agent, belonging to the field of waste water treatment. According to the invention, a mixed solution of hexadecyltrimethylammonium bromide and lanthanum chloride is used as a modifying solution to be used for modifying zeolite, and then the modified zeolite is mixed with polyaluminum ferric chloride (PAFC) in different ratios to prepare the modified zeolite organic matter composite agent. The modified zeolite organic matter composite agent is applied to biochemistry tail water in a sewage treatment plant, the ammonia nitrogen treatment effect is relatively good, and nitrate nitrogen and total phosphorus treatment effects are improved greatly. The composite agent has the advantages of being easy to operate, better than a coagulant in settling property, good in treatment effect, wide in application range and capable of removing nitrate nitrogen and ammonia nitrogen simultaneously; in the practical engineering operation, the use amount of the composite agent can be changed flexibly to realize an ideal treatment effect, nitrogen and phosphorus contaminants in water can be removed synchronously, and particularly a very good purifying effect on low-concentration nitrogen and phosphorus in the biochemistry tail water is realized.

The invention relates to a preparation method of a composite gel material which has excellent adsorption capacity of heavy metal ions, such as lead, cadmium, nickel, chromium, and molybdenum, and a phenolic compound, such as phenol, methylphenol, and xylenol, at the same time, is high in adsorption quantity and efficiency, and can be reused after washing, and relates to a product of the composite gel material. Attapulgite is subjected to water washing and acid washing, and is modified through a sodium chloride solution, hexadecyltrimethylammonium bromide, and a humic acid to prepare humic-acid-modified attapulgite. The humic-acid-modified attapulgite and acrylamide hydrogel are compounded to prepare the product of the composite gel material. The preparation method of adsorption macromolecule hydrogel is simple in process and low in cost, does not require any special equipment, and is easy for industrial application. The strength of the prepared gel is greatly improved.

The invention provides a composite nano-material with nano-particles wrapped by meso-porous silica, and a preparation method and an application thereof. The preparation method comprises the followingsteps: firstly, dispersing nano-particles into an ethanol-water solution, adding ammonium hydroxide to adjust the pH value, dropwise adding an ethanol-water solution of hexadecyltrimethylammonium bromide under the ultrasonic action, continuing ultrasonic treatment, dropwise adding tetraethoxysilane, and purifying to obtain the composite nano material which takes meso-porous silica as a shell and nano-particles as a core and is uniform, stable and controllable in size. Binuclear or trinuclear nanoparticles of different types / functions can be embedded into the same meso-porous silica shell to realize multi-core wrapping, the method is universal, can be expanded to wrapping of more different nano-particles, is green and efficient in preparation process, can be carried out at room temperature,and is hydrophilic in used solvent, low in cost and simple in process, the particle size of the obtained composite nano-material is as low as 50 nm, and the composite nano-material with different sizes can be obtained by adjusting the proportion of used reagents.

The invention discloses a method for preparing hydrophobic white carbon black. The method comprises the steps of drying precipitated white carbon black to constant weight, then mixing with a modifier solution, adjusting a pH value to 8; and at a temperature of 30-90 DEG C, stirring for a reaction for 20-100 min with a stirring speed of 250-450 rpm, then filtering, and drying to obtain the hydrophobic white carbon black. The modifier is selected from one or more of cetyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, and dodecyltrimethylammonium bromide. The activation degree of the modified white carbon black is obviously improved and can reach 95% or more, and the modified white carbon black is the hydrophobic white carbon black. The method of the invention is simple in process, has the solvent with cleanliness and no pollution; and the modified white carbon black has the hydrophobic property improved significantly, and thereby being beneficial to improving compatibility when adding into rubber and plastics.

The invention relates to a method for preparing diantimony trioxide nano-particles by a mechanochemical modification technology. The method comprises the following steps: (1) mixing and ball-milling micrometer diantimony trioxide, small hard alloy steel balls and distilled water to obtain nano-Sb2O3 particles; (2) washing, drying and sieving the nano-Sb2O3 particles to obtain a nano-Sb2O3 sample;(3) mixing the nano-Sb2O3 sample, small hard alloy steel balls and distilled water, adjusting the pH value, adding hexadecyltrimethylammonium bromide, carrying out ball milling, and cleaning, filtering and drying the obtained mixture to obtain cationic surfactant CTAB modified nano-Sb2O3 particles; (4) adding the cationic surfactant CTAB modified nano-Sb2O3 particles into an ethanol-water solution, and carrying out ultrasonic dispersion so as to obtain cationic surfactant CTAB modified nano-Sb2O3 particles; and (5) mixing and ball-milling the cationic surfactant CTAB modified nano-Sb2O3 particles, a silane coupling agent KH580, small hard alloy steel balls and anhydrous ethanol, and cleaning, filtering and drying the obtained mixture to obtain CTAB and KH580 compounded modified nano-Sb2O3.The method has the advantages of simple process, high yield, high operability, and easiness in realization of industrial production.

The invention discloses a preparation method of a Sn-doped ZnO nanocrystalline, which is used for solving the technical problem that the preparation temperature is high in the traditional preparation method for preparing the metal-Sn-doped ZnO. In a technical scheme, the preparation method comprises the following steps: mixing and grinding Zn(NO3)2.6H2O, SnCl4.5H2O and NaOH, adding a cationic surfactant, namely, hexadecyltrimethylammonium bromide, continuing grinding, and washing ground materials with deionized water and absolute alcohol before drying until no impurity ions exist; and drying and grinding obtained white powder, calcining in a muffle furnace to obtain the metal-Sn-doped ZnO. In the preparation method disclosed by the invention, the preparation temperature of the metal-Sn-doped ZnO is decreased to 500-600 DEG C from 1280 DEG C in the prior art.

The present invention provides a method of producing ternary metal-based nanowire networks. The method comprises combining an aqueous mixture of a platinum hydrate, a ruthenium hydrate, and an iron hydrate with a solution of hexadecyltrimethylammonium bromide in chloroform to form an inverse micellar network; adding a reducing agent to reduce metal ions within the inverse micellar network; and isolating the nanowires. The relative amounts of the platinum, ruthenium and iron in the mixture correlate to the atomic ratio of the platinum, ruthenium and iron in the ternary nanowires. The diameters of the ternary nanowires are from about 0.5 nm to about 5 nm.

The invention discloses a preparation method of a lithium-sulfur battery electrode material, which comprises the following steps: adding hexadecyltrimethylammonium bromide into absolute methanol, carrying out ultrasonic treatment, adding carbon nanotubes and cobalt nitrate hexahydrate, and carrying out ultrasonic treatment to obtain a solution A; adding 2-methylimidazole into an absolute methanolsolution, carrying out ultrasonic treatment to obtain a transparent solution B, adding the solution A into the solution B, conducting stirring, centrifuging, filtering, and drying to obtain a productI; adding the product I into an absolute ethyl alcohol solution, carrying out ultrasonic stirring, then adding nickel nitrate hexahydrate, carrying out ultrasonic treatment, and then conducting stirring, filtering and drying to obtain a product II; putting the product II into a tubular furnace, and conducting calcining for 2.5-3 hours in a nitrogen atmosphere to obtain a product NiCo(O) / CNTs; andadding NiCo(O) / CNTs into a high-pressure reaction kettle with a polytetrafluoroethylene lining, then adding sublimed sulfur, carrying out high-temperature reaction, and conducting cooling to obtain the material Ni-Co(O) / CNTs / S. The electrode material Ni-Co(O) / CNTs / S provided by the invention has excellent rate capability, and has small discharge capacity loss after 200 cycles.

The invention discloses a method for preparing a polyaluminum sulfatochloride water treatment agent, which comprises the following steps: reacting 10-15 parts by weight of aluminum hydroxide and 15-20parts by weight of hydrochloric acid at high temperature and high pressure for 2-4 hours; adding 10-15 parts of aluminum sulfate liquid and 15-20 parts of water into aluminum chloride liquid, conducting reaction for 1-2 h, then adding 0.01-0.05 part of polyethylene glycol and 0.01-0.05 part of hexadecyltrimethylammonium bromide, and conducting reaction for 1-2 h, so as to obtain an aluminum sulfate and aluminum chloride mixed solution; and adding 0.05-0.10 part of chitosan, conducting heating and stirring for 30-60 minutes, and carrying out filter pressing, drying and packaging to obtain thepolyaluminium sulfatochloride water treatment agent. The polyaluminium sulfatochloride water treatment agent prepared by the invention has a large specific surface area and good adsorption performance, improves the flocculation performance and flocculation effect, has good stability, can quickly remove pollutants such as turbidity, chroma, heavy metal ions, COD and the like, and has a wide application prospect in sewage or drinking water treatment.