12 results about "Sodium selenide" patented technology

The invention discloses an electrolyte interference resistant solid heavy metal cation electrode and a preparation and use method thereof, and belongs to the technical field of electrode preparation. The electrode sequentially comprises a heavy metal wire, a nano heavy metal coating, a heavy metal / selenide sensitive film or a heavy metal / sulfide sensitive film and a nano microporous polyvinyl chloride film from inside to outside. Firstly, a nanometer heavy metal coating is formed on the surface of a to-be-plated heavy metal wire through an electroplating method; placing in a sodium selenide solution or a sodium sulfide solution for chemical deposition reaction to generate a heavy metal / selenide sensitive film or a heavy metal / sulfide sensitive film to obtain a heavy metal ion selective electrode blank; vertically dipping in a film-forming agent, and standing vertically with the detection end facing upwards, so that a nano-microporous polyvinyl chloride film is generated on the surface; and finally, washing to remove the residual film-forming agent, and drying to obtain the electrolyte interference resistant solid heavy metal ion electrode. The electrode is firm in structure and small in size, is matched with a reference electrode for use, and is sensitive in response to metal ions in a solution to be detected.

This invention belongs to the technical field of sodium-ion battery electrode materials, specifically relating to a preparation method and application of an air-stable molten asphalt-coated sodium selenide composite cathode sodium replenisher. The invention first prepares pure-phase sodium selenide nanoparticles in a glove box by room temperature stirring. Then, asphalt is grown in situ on the surface of the sodium selenide through ball milling and high-temperature calcination, thereby forming a core-shell structured sodium selenide composite sodium replenisher material coated with molten asphalt. The resulting composite sodium replenisher is stable in air for extended periods without deterioration, while simultaneously reducing the decomposition potential of sodium selenide and improving its decomposition efficiency. Coupled with a layered oxide cathode, it can achieve cathode sodium replenishment, compensating for the loss of active sodium caused by the growth of the SEI film on the surface of the hard carbon anode. Furthermore, its decomposition product, selenium, can inhibit the lattice oxygen evolution of the layered oxide cathode, improving the structural stability of the cathode and thus effectively enhancing the battery's initial efficiency and cycle performance, demonstrating promising commercial application prospects.

The invention discloses a solid mercury ion electrode resistant to electrolyte interference, a preparation method and a use method, and belongs to the technical field of electrode preparation. The electrode sequentially comprises a gold wire serving as a base material, a gold amalgam transition conducting layer, a mercury / mercury selenide sensitive film or a mercury / mercuric sulfide sensitive film and a nano microporous polyvinyl chloride film from inside to outside. Firstly, a gold amalgam transition conducting layer is formed on the surface of a gold wire through an electroplating method or a soaking method; immersing in a sodium selenide or sodium sulfide solution to form a mercury / mercury selenide sensitive film or a mercury / mercury sulfide sensitive film on the surface to obtain a mercury ion electrode blank; vertically dipping the mercury ion electrode blank into the film-forming agent, and standing vertically with the detection end facing upwards, so that a nano-microporous polyvinyl chloride film is generated on the surface of the mercury ion electrode blank; and finally, washing to remove the residual film-forming agent, and drying to obtain the electrolyte interference resistant solid mercury ion electrode. The electrode is firm in structure and small in size, is matched with a reference electrode for use, and is sensitive in response to mercury ions in a solution to be detected.

The invention discloses an oxidative stress response nano preparation as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing sodium cocoyl glutamate and 2-amino-2-methyl-1-propanol with water, slowly dropwise adding isopropyl triisopropoxy silane, adding a mixed solution of N-(3-trimethoxysilylpropyl) urea, sodium selenide and isopropyl triisopropoxy silane, and stirring to form nanoparticles; (2) dispersing the nano-particles in a buffer solution containing lysozyme and esterase, and oscillating and incubating to obtain organic silicon nano-particles with hollow structures; and (3) dispersing the organic silicon nanoparticles in a dihydroquercetin solution, filtering, washing uncombined substances, and carrying out vacuum drying to obtain the oxidative stress response nano preparation. The preparation disclosed by the invention can trigger drug release through ROS in an oxidative stress environment, so that the targeting property of the drug in pathological tissues such as tumors and the treatment effect of the drug are improved, the influence on normal tissues is reduced, and the treatment safety of the drug is enhanced.

Disclosed is a method for forming selenoneine or analogs thereof. The method may include phosphorylating sodium selenide to a selenophosphate, using adenosine triphosphate (ATP) and at least a first protein, generating a selenosugar by converting the selenophosphate using at least a second protein in the presence of a common sugar donor, and forming selenoneine or an analog thereof by combining the selenosugar with N,N,N-trimethyl-L-histidine or analogs thereof using at least a third protein. The method may include combining SenA, SenB, and SenC in an aqueous buffer at neutral pH and ambient temperature, and allowing SenA, SenB, and SenC to form selenoneine or an analog thereof in the presence of ATP, a common sugar donor, and sodium selenide.

The invention discloses a selenized biomass carbon material and a preparation method thereof in the field of biomass carbon materials, and the method comprises the following steps: by taking tree fallen leaves as a biomass carbon source, after wall breaking and crushing, soaking the tree leaves in a sodium selenide / sodium selenite mixed solution at room temperature, so that selenium and a carbon skeleton form a C-Se bond, and selenylation is completed; and calcining in a nitrogen atmosphere to obtain the selenium-carbon material. And finally, adding the prepared selenium-carbon material into a mixed solution of organic acid and long-chain amine, soaking and activating to obtain the selenized biomass carbon material. The material has broad-spectrum antibacterial activity and excellent antioxidant activity at the same time. The raw materials are cheap and renewable, the whole process is environment-friendly, low in energy consumption and free of secondary pollution, the carbon neutralization strategy is met, the materials can be further processed into medical dressings, food fresh-keeping coatings, water purification filter elements or antioxidant packaging films, multiple purposes are achieved through one agent, and the industrialization prospect is clear.

The invention provides a preparation method and application of a high-activity nano-selenium solution, and the method comprises the following steps: dissolving sodium selenide powder in water under the protection of nitrogen to obtain a sodium selenide aqueous solution; adding gray black selenium powder into the sodium selenide aqueous solution, and fully reacting to obtain a sodium polyselenide aqueous solution; adding an emulsifier and chloroform into the sodium polyselenide aqueous solution, and fully dispersing to obtain a sodium polyselenide mixed solution; after a demulsifier is added into the sodium polyselenide mixed solution, the sodium polyselenide mixed solution is layered, upper-layer liquid and lower-layer liquid are included, and the upper-layer liquid and the lower-layer liquid are separated; and adding water into the subnatant to fully disperse, and distilling to obtain a red nano-selenium solution after the distillation is finished. The operation for preparing the nano-selenium solution is simple, the preparation yield of the nano-selenium is high, and the sodium selenide solution used in the nano-selenium preparation process can be reused.

The invention discloses a simple preparation and separation method of high-valence selenium and low-valence selenium in the technical field of feeds and fertilizers, which comprises the following steps: by taking elemental selenium and sodium hydroxide or potassium hydroxide as raw materials, generating a mixed solution of sodium selenide and sodium selenite in one step through disproportionation reaction, and then connecting-2-valence selenium to starch molecules through nucleophilic addition reaction to obtain the high-valence selenium and low-valence selenium. The method comprises the following steps: by taking selenium as a raw material, generating a high-stability selenized starch material, and carrying out solid-liquid separation to respectively obtain the selenized starch material and a selenite-containing mother solution, thereby realizing the separation of high-valence selenium and low-valence selenium. The selenized starch material can be used for producing selenium-rich feed, and tetravalent selenium in the solution can be used for producing selenium-rich compound fertilizer. The method has the advantages of short process flow, simple operation, no need of introduction of complex reagents or expensive equipment and low cost, and avoids the regeneration of selenium elementary substance by the neutralization reaction through the separation technology. The method provides a new technical path for realizing high-valued utilization of selenium.

The invention discloses a method for synthesizing 2-mercaptobenzothiazole derivatives, and belongs to the technical field of synthesizing 2-mercaptobenzothiazole derivatives. The method comprises: using o-amino aromatic disulfide and carbon disulfide as raw materials, dissolving in a solvent, under the action of sodium selenide, the o-amino aromatic disulfide breaks the S-S bond, and the carbon disulfide is activated, and a cyclization reaction is performed to obtain 2-mercaptobenzothiazole derivatives. The present invention utilizes sodium selenide activator to develop a method for synthesizing 2-mercaptobenzothiazole derivatives based on Se-S dynamic chemistry, achieving the advantages of low activator dosage, good substituent tolerance, and high yield.

The invention discloses a tubular polyaniline-loaded copper-selenium catalyst in the field of aldoxime dehydration reaction catalysts and its preparation method and use. The catalyst is prepared by photocatalytic oxidation polymerization of aniline in the presence of copper salts and polymeric carbon nitride, and then impregnated in a sodium selenide solution. The method is simple to operate and raw materials are easily available. The obtained catalyst can be used for the dehydration reaction of adipaldehyde-1,6-dioxime. Polyaniline is used to form a unique tubular structure so that its internal selenium-copper material will not be over-oxidized, thereby being able to selectively catalyze the dehydration reaction of adipaldehyde-1,6-dioxime to generate adiponitrile, without deoximation to generate adipaldehyde or further oxidation to generate adipic acid due to an oxidation reaction. The reaction can be controlled to proceed under mild conditions.

The invention discloses a method for preparing a self-supporting copper selenide nanosheet electrocatalyst, comprising the following steps: (1) immersing copper foam in a mixed solution of alkali and persulfate, so that metal stripping and oxidation reactions occur in the solution to obtain a self-supporting copper hydroxide nanobelt; (2) mixing and dissolving selenium powder and sodium borohydride powder to obtain a sodium hydrogen selenide precursor; (3) mixing the self-supporting copper hydroxide nanobelt with the sodium hydrogen selenide precursor, and performing a hydrothermal reaction, and the obtained product is a self-supporting copper selenide nanosheet electrocatalyst. The catalyst exhibits excellent electrochemical performance. At a voltage of ‑1.2V vs. RHE, the Faraday efficiency of electrocatalytic carbon dioxide conversion to carbon monoxide is as high as 85.6%, and the carbon monoxide partial current density is as high as 12.0mA cm ‑2 , a H2 / CO ratio was achieved over a wide potential, i.e., 0.8 to 6.0, achieving an excellent conversion frequency TOF.

The invention provides a synthesis method of a dialkyl selenide compound, which comprises the following step: by taking olefin and sodium selenide as raw materials and acid as an additive, reacting in an organic solvent under the protection of inert gas to obtain the dialkyl selenide compound. Compared with a traditional process, the method has the advantages of cheap and easily available raw materials, mild conditions, simple operation, high atom economy, excellent chemical selectivity, good functional group compatibility, wide substrate universality and the like, and is suitable for industrial production of the dialkyl selenide compounds, especially complex organic selenium compounds containing multiple functional groups.