87 results about "Hexadecyltrimethylammonium bromide" patented technology

The invention relates to the technical field of photocatalysts, in particular to a bismuth-defect bismuth oxybromide-sulfur-defect bismuth sulfide bromide heterojunction and a preparation method and application thereof in photocatalytic CO2 reduction, Bi (NO3) 3.5 H2O, thiourea, cetyltrimethylammonium bromide (CTAB) and the like are used as raw materials, and the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction is prepared through a two-step hydrothermal method. According to the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction, bismuth vacancies and sulfur vacancies are introduced, the visible light absorption range of the material is expanded through a proper amount of double vacancies, more electron capture centers are provided, and the separation efficiency of photo-induced electrons and the vacancies is improved, so that the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction has excellent performance of photocatalytic reduction of CO2, and the preparation method of the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction is suitable for large-scale production and application of the VBi-Bi4O5Br2 / VS-Bi19Br3S27 heterojunction. CO2 can be reduced into a single product CO, and the photoreduction efficiency of the carbon dioxide can be improved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to an adsorption particle electrode for wastewater and waste liquid treatment and a preparation method thereof. The preparation method comprises the following steps: adding a zinc salt, a vanadium salt, a scandium salt and cetyltrimethylammonium bromide into water, stirring, adjusting the pH value at 70-80 DEG C, continuously stirring, filtering, drying and calcining to obtain modified mesoporous zinc oxide; and dispersing the modified mesoporous zinc oxide in water, adding the composite aerogel, soaking, filtering, washing, drying and grinding to obtain the adsorption particle electrode. The adsorption particle electrode prepared by the invention can be used for degrading printing and dyeing wastewater, and has the excellent performances of high degradation rate, high degradation speed, reusability and the like.

The invention discloses a zinc oxide composite sunscreen material based on mesoporous silica, and preparation and application thereof, and belongs to the technical field of sunscreen of cosmetics. In order to solve the technical problem that the sunscreen efficiency is reduced due to the fact that nano-zinc oxide synthesized by an existing method is easy to aggregate and poor in dispersion stability, the technical scheme is characterized in that triethanolamine, sodium salicylate, tetraethoxysilane and cetyltrimethylammonium bromide are used as raw materials to prepare a carrier mesoporous silica microsphere; mSN (NH2) is obtained through amination treatment of mesoporous silica microspheres, zinc acetate dihydrate and anhydrous sodium carbonate are adopted as raw materials, nano-zinc oxide is successfully loaded on the surface of the MSN (NH2) through secondary deposition, and the sunscreen material MSN (NH2) (at) ZnO which is high in sunscreen performance, good in dispersion stability, high in oil absorption value and good in carrier function is prepared.

This invention provides a photocatalytic composite nanoenzyme self-cleaning coating, its preparation method, and its application. Specifically, it includes: preparing solution A with Ca(NO3)2·4H2O and nano-cerium oxide; preparing solution B with (NH4)2HPO4 and hexadecyltrimethylammonium bromide; mixing solutions A and B, and reacting at high temperature to obtain cerium oxide nanoenzyme / hydroxyapatite microspheres; and using (NH4)6Mo7O... 24 Solution M is prepared by dissolving Fe(NO3)3·9H2O in deionized water; solution N is prepared by dissolving Fe(NO3)3·9H2O in deionized water; solutions M and N are mixed to obtain a precursor; the precursor is reacted with cobalt oxide at high temperature to obtain Co / Fe2(MoO4)3; tetraethyl orthosilicate, anhydrous ethanol, deionized water, and ammonia are mixed and sealed for aging; after adding a modifier, it is mixed with cerium oxide nanoenzyme / hydroxyapatite microspheres and Co / Fe2(MoO4)3, sprayed onto the obtained composite coating, and cured at high temperature to obtain a self-cleaning coating. This invention, by loading a photocatalyst and nanoenzyme / hydroxyapatite microspheres onto the surface of a modified SiO2 gel, effectively improves the photocatalytic activity and self-cleaning performance of the coating while maintaining good optical transmittance.

This invention discloses a crack-resistant rheologically modified functional material for steel-concrete composite cable towers, its preparation method, and its application. The crack-resistant rheologically modified functional material of this invention comprises 1-10 μm ultrafine light-burned magnesia expandable material, 15-30 μm medium-fine light-burned magnesia expandable material, 30-100 μm medium-coarse calcareous expandable material, 0.1-2 μm fly ash microspheres, 0.02-0.05 μm nano-silica, and an anti-agglomeration regulating material. The anti-agglomeration regulating material is composed of a zirconium aluminate coupling agent and hexadecyltrimethylammonium bromide. This crack-resistant rheologically modified functional material is applied to the concrete of ultra-high strength steel-concrete composite cable tower structures. Concrete prepared using the crack-resistant rheologically modified functional material of this invention exhibits low viscosity, good anti-segregation properties, and volume stability, achieving a synergistic unity of rheological modification and crack-resistant expansion in the concrete of ultra-high strength steel-concrete composite cable tower structures.

This invention discloses a method for preparing a highly coordinated sulfur-doped single-atom catalyst and its application, comprising the following steps: S1, mixing and stirring zinc nitrate hexahydrate, dimethylimidazole, hexadecyltrimethylammonium bromide, a metal source, and deionized water to obtain metal-doped ZIF-8; S2, heating the metal-doped ZIF-8 under an argon atmosphere to obtain an undoped metal single-atom catalyst; S3, preparing the undoped metal single-atom catalyst into a highly coordinated sulfur-doped metal single-atom catalyst; S4, adding the highly coordinated sulfur-doped single-atom catalyst to antibiotic wastewater for treatment; This invention avoids coordination in the first shell of the metal atom by mixing the single-atom catalyst and thiourea and performing a second pyrolysis, thereby forming a sulfur-doped highly coordinated single-atom catalyst.

This invention belongs to the interdisciplinary field of biomedical engineering, materials science, and tissue engineering, and discloses a multifunctional hydrogel with switchable mechanical and adhesive properties based on temperature triggering, its preparation method, and applications. The invention consists of acrylic acid, gelatin, hexadecyltrimethylammonium bromide, polydopamine nanoparticles loaded with silver nanoparticles, and water. This invention not only exhibits excellent adhesion and mechanical properties to skin tissue but also possesses switchable mechanical and adhesive properties, achieving durable and repeatable adhesion. The temperature-triggered hydrogel prepared by this invention is simple to process, low in cost, and introduces no toxic chemicals. It can achieve a close fit at body temperature and natural detachment at low temperatures, driven by temperature, and maintains excellent adhesion properties even in complex environments, thus promoting the development of intelligent medical multifunctional wound dressings.

This invention provides a nitrogen-doped carbon composite cobalt-nickel diselenide nanocubic material, its preparation method, and its application in batteries. The invention involves dispersing cobalt salt, nickel salt, and hexadecyltrimethylammonium bromide in a solvent and mixing to obtain solution A; dispersing an organic ligand in the solvent and mixing to obtain solution B; pouring solution A into solution B and aging at room temperature to obtain a nanocubic precursor; then mixing with selenium powder and calcining under a protective atmosphere to obtain the CoNiSe2 / NC composite material. Compared with existing technologies, the synergistic effect of Co and Ni in this invention provides more active sites for the reaction and improves conductivity, resulting in a significant improvement in sodium-ion battery performance. Furthermore, the synthesis in this invention is performed at room temperature, simplifying the process; the porous structure design greatly improves the battery's cycle stability, extends its lifespan, and increases and stabilizes its capacity.

The invention discloses a Fe-modified TiO2 hollow microsphere photo-Fenton catalyst as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation, and the preparation method comprises the following steps: preparing TiO2 microspheres with hollow structures from hexadecyl trimethyl ammonium bromide, absolute methanol, deionized water and tetrabutyl titanate; the method comprises the following steps: mixing ferrocene and 0.25 C-TiO2 powder, putting the mixture into a quartz tube, putting the quartz tube into a muffle furnace, heating and pyrolyzing according to a two-stage program, alternately washing black powder with absolute ethyl alcohol and deionized water after the pyrolysis is finished, and drying to obtain a sample CT-5Fe; the preparation method comprises the following steps: dispersing CT-5Fe in an H2O2 solution, carrying out a water bath reaction, collecting a gray product, carrying out centrifugal operation, washing, and drying to obtain the Fe-modified TiO2 hollow microsphere photo-Fenton catalyst, namely CT-5Fe-HO. According to the invention, a photocatalysis-Fenton-like coupling system for phenol degradation is constructed, the PMS adsorption and activation capability is enhanced, high activity and good cycle stability are maintained in a wide pH range and in a complex water body, and a solution is provided for water body pollution treatment.

This invention discloses a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid, its preparation method, and its application. The preparation method includes: S1, pretreating nickel foam (NF); S2, dissolving disodium hydrogen phosphate dodecahydrate and hexadecyltrimethylammonium bromide in a mixture of water and ethylene glycol, adding cobalt nitrate and stirring to obtain a precursor; S3, immersing the nickel foam in the precursor solution and refrigerating it overnight at low temperature; S4, transferring it to a reaction vessel and hydrothermally heating it at 160 °C for 10 hours to obtain cobalt phosphate (CoPO / NF); S5, using CoPO / NF as the working electrode, electrochemically depositing platinum in an H2PtCl6 and KOH electrolyte using cyclic voltammetry; S6, washing and vacuum drying to obtain the final product. This invention is the first to prepare a platinum-cobalt phosphate catalyst for the selective electrooxidation of ethylene glycol to glycolic acid at 100 mA cm⁻¹. ‑2 With a working potential of only 0.67 V at current density (relative to RHE) and a Faraday efficiency of 100% for glycolic acid, it has significant advantages and application potential in the highly selective production of glycolic acid in the electro-oxidation reaction of ethylene glycol.

The invention discloses a coating type catalytic electrode and a preparation method and application thereof.The preparation method comprises the steps that copper chloride dihydrate, cobalt nitrate, hexadecyl trimethyl ammonium bromide and foamy copper serve as raw materials, and three catalysts of CuOx, CoOx and CoOx / CuOx are firstly prepared through a hydrothermal method and an annealing calcination method; and preparing the catalyst into slurry, and coating the slurry on a foamy copper substrate subjected to acid treatment and roasting independently or uniformly mixed to obtain a coating type CoOx electrode, a CoOx / CuOx electrode and a CoOx + CuOx electrode. The coating type catalytic electrode is applied to a reaction for electro-catalytic synthesis of 6-aminocapronitrile, a three-electrode system is adopted, 0.1 M cyclohexanone and 500 ppm ammonium chloride are used as electrolyte, and the reaction is carried out within the RHE potential range of-0.6 V vs to-1.1 V vs. The preparation process is simple and easy to control, green and environment-friendly, the raw materials are cheap and rich in resources, the problems of high energy consumption, low selectivity and dependence on precious metal catalysts in the traditional 6-aminocapronitrile synthesis are effectively solved, and the industrial production requirements are met.

This invention provides a kit for the detection of interleukin-23, its method of use, and its application, relating to the field of in vitro detection. The kit for interleukin-23 detection provided by this invention comprises a pre-activation solution and an activation solution; the pre-activation solution comprises 0.03-0.15 mol / L hydrogen peroxide and 0.01-0.05 mol / L benzoic acid; the activation solution comprises 0.5-1.5 mol / L sodium hydroxide and 3-8 g / L hexadecyltrimethylammonium bromide; this kit can be used to determine interleukin-23 in serum, exhibiting high accuracy, high signal-to-noise ratio, and strong stability.

The invention belongs to the technical field of intelligent wearable electronics, and particularly relates to a preparation method of an MXene / CNTs / TPU fiber membrane flame-retardant flexible strain sensor with a bimodal fold structure. The preparation method comprises the following steps: washing and drying a TPU fiber membrane, soaking the TPU fiber membrane in chloroform (CHCl3) for swelling, and fixing and drying the TPU fiber membrane by using a mold; the pretreated fiber membrane is soaked in a cetyl trimethyl ammonium bromide (CTAB) solution to be subjected to modification treatment; then the TPU fiber is put into an MXene / CNTs mixed solution for ultrasonic treatment, so that MXene / CNTs are evenly attached to the surface of the TPU fiber, demolding is conducted after deswelling, and a fiber membrane retracts; and repeating the steps of CTAB (Cetyltrimethyl Ammonium Bromide) modification and MXene / CNTs attachment, so as to prepare the MXene / CNTs bimodal folded conductive fiber membrane with different buckling. Phytic acid (PA) is attached to the surface of the fiber through a repeated impregnation method, then a copper electrode is assembled and packaged with PDMS, and the flame-retardant flexible strain sensor with the bimodal folded conductive structure is obtained.

This invention discloses a heat- and impact-resistant protective conduit for MPP cables and its preparation method, relating to the field of polymer materials technology. The components, by weight, include: 20-22 parts of a toughening dispersion made from anhydrous ethanol and terminally epoxy-terminated hyperbranched polysiloxane; 33-35 parts of a boron-nitrogen co-doped carbon dot made from citric acid, boric acid, and urea, first compounded with phytic acid and piperazine, then compounded with modified zirconium phosphate prepared by hexadecyltrimethylammonium bromide intercalation, and then modified with silane coupling agent KH-560 to form a flame retardant synergist; 12-14 parts of polyolefin elastomer; 2-2.5 parts of magnesium aluminum hydrotalcite; 0.2-0.24 parts of antioxidant; 0.2-0.3 parts of calcium stearate; 0.2-0.3 parts of polyethylene wax; and 100-120 parts of polypropylene. The introduction of the flame retardant synergist and other raw materials in this invention effectively improves flame retardancy, aging resistance, impact resistance, low-temperature resistance, and heat resistance.

The invention relates to double transition metal doped manganese sulfide-cyclodextrin (MnM1M2S3-CD) as well as a preparation method and an application of the double transition metal doped manganese sulfide-cyclodextrin (MnM1M2S3-CD). The preparation method comprises the following steps: suspending cyclodextrin in an ethanol solution containing Mn < 2 + >, transition metal M < 12 + > and transition metal M < 2 + >, and stirring and reacting for 2.0-24.0 hours at 0-60 DEG C in an N2 atmosphere; after stirring is completed, a reaction mixture is subjected to suction filtration and ethyl alcohol washing, and cyclodextrin solids adsorbing Mn < 2 + >, transition metal M < 12 + > and transition metal M < 2 + > are obtained. The method comprises the following steps: putting a cyclodextrin solid adsorbed with metal ions, thiourea and hexadecyl trimethyl ammonium bromide into a hydrothermal kettle, and carrying out hydrothermal reaction at 100-200 DEG C for 8.0-48.0 hours; and washing the obtained solid with ethanol and deionized water, and carrying out vacuum drying at 80 DEG C to obtain the double transition metal doped manganese sulfide-cyclodextrin (MnM1M2S3-CD). The invention discloses a method for preparing ethanol by reducing CO2 under driving of visible light. The method is carried out at room temperature, uses visible light as an energy source and water as a solvent and a hydrogen source, and has the characteristics of environmental protection, energy conservation and emission reduction.

This invention discloses a method for preparing EBSD analysis samples of nickel-based resistance alloy foil, comprising: using stainless steel as the cathode and nickel-based resistance alloy foil as the anode, connected to the negative and positive terminals of a constant current and voltage regulated power supply, respectively; immersing the anode and cathode in an electrolytic polishing solution for electrolytic polishing; the raw materials of the electrolytic polishing solution include phosphoric acid, sulfuric acid, hydrochloric acid, hexadecyltrimethylammonium bromide, and water; after completion, removing the nickel-based resistance alloy foil, washing, and drying. The electrolytic polishing solution used in this invention can effectively remove the stress layer on the surface of the foil, resulting in a smooth and clean surface without continuous corrosion pits. It has advantages such as wide availability of materials, simple preparation, low price, and high calibration rate. The electrolytic polishing method of this invention is easy to operate, requires short sample preparation time, has low cost, and stable results, effectively reducing the hardware requirements for foil EBSD sample preparation and facilitating widespread application.

The invention provides a novel urchin-shaped ordered carbon-iron composite material as well as a preparation method and application thereof, and belongs to the technical field of carbon nanomaterials. The preparation method comprises the following steps: by taking triethanolamine, cetyltrimethylammonium bromide, sodium salicylate and tetraethyl silicate as raw materials, mixing and stirring, carrying out hydrothermal reaction, washing and centrifuging, drying and calcining in an air atmosphere to obtain an urchin-shaped silicon template; then compounding the silicon template and dopamine in a Tris solution, and carrying out stirring ultrasonic treatment, standing in a dark place and centrifugal drying to obtain mesoporous silicon filled with polydopamine; and mixing the product with ferrocene in acetone, adding a hydrogen peroxide solution, carrying out oil bath stirring until the solvent is volatilized, drying, calcining in an inert atmosphere, and finally, carrying out alkaline solution reflux and centrifugal drying treatment to obtain the novel urchin-shaped ordered carbon-iron composite material. The obtained novel urchin-shaped ordered carbon-iron composite material has excellent catalytic activity, and has a good application prospect in the fields of electro-catalysis, engineering materials, energy storage and conversion and the like.

This invention discloses a preparation process for a composite defluorinating agent, belonging to the field of water treatment technology. The process involves dissolving polyethylene glycol in water, adding nano-hydroxyapatite, and stirring to obtain polyethylene glycol-modified nano-hydroxyapatite; hydrolyzing a silane coupling agent in an ethanol-water solution, adding the polyethylene glycol-modified nano-hydroxyapatite, and reacting to obtain silane coupling agent-polyethylene glycol-modified nano-hydroxyapatite; adding the silane coupling agent-polyethylene glycol-modified nano-hydroxyapatite to a hexadecyltrimethylammonium bromide solution and stirring to obtain composite-modified nano-hydroxyapatite; adding the composite-modified nano-hydroxyapatite and β-cyclodextrin to a sodium hydroxide solution, adding a crosslinking agent and an emulsifier, and reacting to obtain composite sustained-release microspheres; adding Fe3O4 powder to an ethanol-water solution, adding the composite sustained-release microspheres, and adding NaOH solution dropwise in a constant-temperature water bath until the pH reaches 9; aging the resulting precipitate, washing with water, and drying to obtain the composite defluorinating agent.

The invention discloses a PdRu polygonal nanosheet and an application of the PdRu polygonal nanosheet in an electroreduction reaction of nitrite. The PdRu polygonal nanosheet is prepared by reacting palladium acetylacetonate and ruthenium acetylacetonate through a one-step solvothermal method by taking benzyl alcohol as a reaction medium and a reducing agent, polyvinylpyrrolidone and hexadecyl trimethyl ammonium bromide as surfactants and CO gas as a limiting agent and a structure-directing agent. The preparation method is simple, conditions are mild, and the PdRu nanosheet which is regular in structure and has a unique polygonal two-dimensional structure can be formed without subsequent heat treatment. The PdRu polygonal nanosheet has abundant exposed atomic sites and a relatively large electrochemical active area, and shows excellent nitrite electroreduction catalytic activity and stability in an alkaline potassium hydroxide solution.

This invention discloses a gas-liquid dual-channel microporous layer, its preparation method, and its application, comprising the following steps: Step S1, zinc acetate is dissolved in methanol solution and dispersed to obtain solution A, 2-methylimidazole, hexadecyltrimethylammonium bromide, and sodium laurate are sequentially dissolved in methanol solution and dispersed to obtain solution B; Step S2, solution A is added to solution B, and after stirring, the solvent is removed to obtain a precipitate. The precipitate is vacuum dried to obtain a precursor p-ZIF-8, and the precursor p-ZIF-8 is subjected to high-temperature heat treatment to obtain porous carbon material p-ZIF-8-C; Step S3, the porous carbon material p-ZIF-8-C, a hydrophobic agent, and a solvent are mixed, dispersed, and prepared into a slurry. The slurry is coated onto a carbon fiber substrate in multiple applications. After coating, the solvent is removed by drying, and after calcination, a gas-liquid dual-channel microporous layer with a cracked surface is obtained. This invention improves the water management and gas transport capabilities inside the membrane electrode by precisely controlling the pore size of the carbon material and achieving adjustable microporous layer cracks, thereby enhancing the performance of the fuel cell.

A Br-W dual-defect high-efficiency photocatalytic material V Br+W -BiOBr / Bi2WO6, its preparation method, and applications: Method 1: Bismuth nitrate pentahydrate is dispersed in ethylene glycol, and hexadecyltrimethylammonium bromide is dispersed in anhydrous ethanol. After mixing and stirring, a mixture 1 is obtained. Mixture 1 is transferred to a Teflon liner and heated at 160℃ for 12 hours. After cooling, it is washed successively with anhydrous ethanol and deionized water to obtain BiOBr. 2: Bismuth nitrate pentahydrate is dissolved in nitric acid solution, and sodium tungstate dihydrate is dissolved in deionized water. After mixing and stirring, a mixture 2 is obtained. BiOBr is sonicated for 15 minutes and dispersed in deionized water to obtain solution F. Mixture 2 and solution F are mixed and sonicated for 15 minutes, then stirred for 2 hours to obtain mixture 3. Mixture 3 is transferred to a Teflon-lined reactor and heated at 160℃ for 20 hours. A white precipitate is obtained, filtered, and washed successively with anhydrous ethanol and deionized water to obtain BiOBr / Bi2WO6. 3: BiOBr / Bi2WO6 is dispersed in sodium hydroxide solution, stirred, filtered, and dried to obtain V. Br+W -BiOBr / Bi2WO6. This invention has good effect on degrading antibiotics in water, and is simple to operate and easy to industrialize.

The invention relates to the field of polyolefin fibers, and discloses a reinforced polyolefin resin composite fiber and a preparation method thereof.The composite fiber is prepared from high-density polyethylene, ultra-high molecular weight polyethylene powder, modified nano silicon dioxide, modified multi-walled carbon nanotubes, a polyethylene grafted maleic anhydride compatilizer, an antioxidant phosphorous acid tri (2, 2, 6-trimethyl-1, 3-pentanediol-2-yl)-2, 3, 6-trimethyl-1, 3-pentanediol-2-yl)-2, 3, 6- the antioxidant is prepared from 2, 4-di-tert-butylbenzene) ester and an antioxidant tetra [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester; the modified multi-walled carbon nanotube is prepared from a multi-walled carbon nanotube, a concentrated nitric acid solution and a cetyl trimethyl ammonium bromide aqueous solution; the modified nano silicon dioxide is prepared from nano silicon dioxide, gamma-(methacryloyloxy) propyl trimethoxy silane, acetic acid and an ethanol water solution. The composite fiber provided by the invention has good wear resistance, antistatic property and mechanical property.

The application discloses a preparation method and application of a nitrite electrochemical sensor based on a polydopamine nanosphere composite material, and belongs to the fields of functional nanocomposite materials and sensing technologies. The prepared polydopamine nanospheres are ultrasonically treated in a hexadecyltrimethylammonium bromide solution, a polydopamine nanosphere / hexadecyltrimethylammonium bromide composite is obtained through electrostatic action, and the composite is drop-coated on a clean electrode surface, and is dried at room temperature to obtain an electrochemical sensor, which can be applied to the detection of nitrite in cured meat. The nanomaterial composite material is simple to prepare and low in cost, and the prepared nitrite electrochemical sensor has high sensitivity, a low detection limit, a wide detection range, a fast detection speed and good reproducibility.

This invention discloses a wasp venom peptide-M nanocomposite, its preparation method, and its applications, belonging to the field of medicinal chemistry. Using indocyanine green as a morphology mediator, this invention prepares an ultra-small particle size dendritic tetrasulfide by reacting it with triethylamine, hexadecyltrimethylammonium bromide, tetraethyl orthosilicate, and bis[3-(triethoxysilyl)propyl]tetrasulfide in water. Wasp venom peptide-M is then loaded onto this nanocomposite to obtain the wasp venom peptide-M nanocomposite. In vitro experiments have confirmed that this composite can significantly kill 4T1 breast cancer cells. Furthermore, thanks to its ultra-small particle size, it also exhibits good targeting and enrichment, significant anti-tumor efficacy, and excellent safety in a breast cancer brain metastasis model, providing a novel and efficient nanomedicine delivery system for brain tumor treatment and the development of related therapeutic drugs.

The invention relates to the technical field of sewage treatment, in particular to a preparation method of a three-electron oxygen reduction ferrocolumbate electrocatalyst and a product and application of the three-electron oxygen reduction ferrocolumbate electrocatalyst. The method comprises the following steps: S1, removing Al from an Nb2AlC raw material by using a chemical etching method to obtain Nb2C particles; s2, a Fe source, a Zn source and hexadecyl ammonium bromide are evenly attached to the surfaces of Nb2C particles through the adsorption effect, after adsorption is completed, 2-methylimidazole, Fe ions and Zn ions are subjected to a coordination reaction to form a stable coordination compound, the Nb2C particles are wrapped with the stable coordination compound, a product is washed with methyl alcohol, then solids are separated out through centrifugation, drying is conducted, and a precursor is obtained; and S3, calcining the precursor at a high temperature to obtain the ferrocolumbate electrocatalyst. According to the catalyst, an interface hydrogen bond network is reconstructed through interlayer confinement-coupling hydrogen terminal engineering to regulate and control a three-step coordinated proton coupling electron transfer step, so that three-electron oxygen is reduced to efficiently generate hydroxyl radicals, and efficient treatment of refractory wastewater is realized.

The invention discloses an additive for increasing the crystal size of calcium hydrophosphate and application of the additive, and belongs to the technical field of inorganic chemical industry. According to the additive for increasing the crystal granularity of the calcium hydrophosphate, the additive is at least one of cetylpyridinium bromide, cetyltrimethylammonium bromide and dodecyl benzyl dimethyl ammonium bromide. In addition, the invention also provides an application of the additive in increasing the crystal particle size of calcium hydrophosphate. The additive for increasing the crystal granularity of the calcium hydrophosphate, provided by the invention, can increase the granularity of the calcium hydrophosphate by more than 50%.

The invention discloses a DFNS C / graphene composite material, an anode material and a preparation method and application of the DFNS C / graphene composite material and the anode material, and relates to the technical field of electrode materials. The method comprises the following steps: taking triethanolamine, cetyltrimethylammonium bromide, sodium salicylate and tetraethyl orthosilicate as raw materials, and taking deionized water as a solvent to obtain DFNS microspheres; uniformly dispersing the DFNS microspheres and dopamine hydrochloride in a buffer solution to obtain DFNS (at) C microspheres; and adding the DFNS (at) C microspheres and the graphene oxide dispersion liquid into a water solvent, uniformly mixing, and reacting at 170-200 DEG C for 20-25 hours to obtain the DFNS (at) C / graphene composite material. The DFNS C / graphene composite material is prepared mainly on the basis of DFNS, dopamine hydrochloride and graphene oxide (GO), so that the problem of volume expansion effect of a silicon-based material can be effectively solved, an excellent Li < + > transmission channel is constructed, the long-term cycling stability under high current is improved, and the comprehensive performance of an anode electrode is further improved.

This invention proposes a coated manganese-based lithium adsorbent and its preparation method, relating to the field of manganese-based lithium adsorbents. The preparation method includes the following steps: dispersing silica in ethanol, water, and ethylenediamine; adding hexadecyltrimethylammonium bromide and tetraethyl orthosilicate; reacting under stirring to obtain a silica-based core; dispersing the silica in anhydrous ethanol; adding tetrabutyl titanate and anhydrous ethanol; adding water and ethanol again; reacting the titanium-silicon composite core with an aqueous glucose solution hydrothermally; cooling and centrifuging; mixing with solid potassium hydroxide; calcining; cooling and washing to obtain a porous core; mixing lithium carbonate, electrolytic manganese dioxide, and the porous core with an appropriate amount of anhydrous ethanol; ball milling; drying; calcining; cooling; grinding; adding to a hydrochloric acid solution; shaking; centrifuging; and obtaining the coated manganese-based lithium adsorbent. Through the synergistic coating of TiO2-SiO2-C three layers, this adsorbent exhibits high adsorption capacity and high stability.

This invention discloses a method for isolating neutral polysaccharides with SARS-CoV-2 S protein binding activity from ephedra polysaccharides, belonging to the field of natural product separation and purification technology. Targeting a mixed system of acidic and neutral polysaccharides in ephedra, this method utilizes the characteristic of hexadecyltrimethylammonium bromide forming an insoluble complex with acidic polysaccharides. Through steps such as complexation precipitation, salt dissociation, dialysis, and lyophilization, efficient separation of acidic and neutral ephedra polysaccharides is achieved. Biomembrane interference experiments verify that the neutral ephedra polysaccharides obtained after removing the acidic polysaccharides by this method have specific binding activity with the SARS-CoV-2 S protein, while the acidic polysaccharides do not exhibit this binding activity. This method is simple, highly efficient, and effectively obtains well-defined neutral and acidic polysaccharide components from ephedra, with the neutral polysaccharides being the core active component binding to the SARS-CoV-2 S protein.

This invention discloses a gold nanowire catalyst, its preparation method, and its applications, belonging to the field of nanomaterials technology. The method involves adding a gold perchlorate solution to a hexadecyltrimethylammonium bromide solution, mixing them at a specific volume ratio, and then adding a freshly prepared ascorbic acid solution to the mixture. The mixture is then shaken to obtain extremely fine, elongated gold nanowires with an aspect ratio of (100-200):1. This invention provides a novel preparation method for addressing the morphology issues in the synthesis of gold nanowires, and the prepared gold nanowires can be applied in the field of electrocatalytic CO2 reduction, significantly improving the selectivity for CO2 reduction to CO.