272 results about "Nitrate ion" patented technology

The invention discloses a synthesis method and application of a Cu / Ni and Cu / Zn bimetallic conductive MOF-based catalyst for enhancing reduction of nitrate into ammonia, and relates to MOF catalyst preparation, and the synthesis method is characterized by comprising the following steps: S1, dissolving cupric acetate monohydrate and nickel acetate tetrahydrate or zinc acetate dihydrate in ultrapure water to prepare a solution A; s2, dissolving 2, 3, 6, 7, 10, 11-hexahydroxy tribenzene and ammonia water into N, N-dimethylformamide (DMF), so as to obtain a solution B; s3, mixing the solution A and the solution B, and performing ultrasonic treatment for 10-30 minutes to prepare a solution C; and S4, heating the solution C in an isothermal oven at 85 DEG C for 1-3 hours, naturally cooling to room temperature, respectively washing with deionized water and acetone for 6 times, and finally drying in a vacuum oven at 60 DEG C to obtain a dark blue crystal. The Cu / Zn and Cu / Ni bimetallic conductive MOF prepared by the method has high specific surface area, and the prepared electrode has high responsivity to nitrate ions, has a remarkable nitrate removal effect, has high removal efficiency and has high ammonia selectivity.

The invention relates to a photoelectrochemical system for synthesizing urea through co-reduction of carbon dioxide (CO2) and nitrate ions (NO3 <->). The system comprises a solar power supply system, a photoelectrocatalysis (PEC) reaction system, a raw material pretreatment system and a product recovery system. The PEC reaction system is communicated with the raw material pretreatment system and the product recovery system in series; and an integrated coupling reaction system is formed. According to the system, solar energy is used as a main energy source, and a co-reduction reaction of CO2 and NO3 <-> is realized through a novel PEC flow cell device, so that urea is directly synthesized. The reaction liquid is conveyed to a product recovery system through a pipeline, and a high-purity urea product is obtained through evaporative crystallization; unreacted CO2 and NO3 <-> can be circulated to the raw material pretreatment system through the reflux device and are further utilized. The method provided by the invention realizes efficient and green synthesis of urea, optimizes the whole process, reduces energy consumption and system complexity, has good economical efficiency and environmental friendliness, and is suitable for the fields of agricultural fertilizers, waste gas and wastewater resourceful treatment and the like.

The invention provides a positive electrode material, a positive electrode plate and a secondary battery. The positive electrode material contains an element M, the element M is selected from at least one metal element in IA group and IIA group in the periodic table of elements, the distribution of the element M in particles meets the condition that X2 / X1 is greater than or equal to 1.2 and less than or equal to 20, X1 is the concentration of the element M in the central region of the particles, X2 is the concentration of the element M in the surface region of the particles, and X3 is the concentration of the element M in the surface region of the particles. The surface of the positive electrode material contains nitrate ions, the content of the nitrate ions is N1, and N1 is more than or equal to 10ppm and less than or equal to 100ppm. The positive electrode material disclosed by the invention has relatively high structural stability and relatively small number of microcracks, a stable interface protection layer can be formed on the surface of the positive electrode material, and side reaction between an electrolyte and the surface of the positive electrode material is reduced, so that the capacity and the cycle performance of a battery prepared from the positive electrode material are comprehensively improved, and meanwhile, the gas production performance is improved.

The invention discloses a compatible molybdenum-aluminum mixed acid etching solution which comprises the following components in percentage by mass: 4%-7% of nitric acid, 55%-65% of phosphoric acid, 17%-28% of acetic acid, 0.5%-3% of an oxidizing additive, 0.05%-5% of a metal corrosion inhibitor and 10%-20% of deionized water, and the oxidizing additive is ceric nitrate and at least one selected from sodium nitrate, potassium nitrate and ammonium nitrate; the etching liquid does not contain other organic components except for organic carboxylic acid and organic carboxylate. According to the compatible molybdenum-aluminum mixed acid etching solution, on the basis that ceric nitrate is introduced, the content of nitric acid is reduced, the nitrate ion concentration is increased by adding nitrate, the overall oxidation performance of an etching solution system is improved, the etching rate ratio of different metals is adjusted, CD-Bias is reduced, the etching dip angles of a molybdenum single layer and a molybdenum-aluminum laminated layer are controlled to be kept at 20-50 degrees, and the problem of aluminum thorns is solved. The invention further discloses a molybdenum-aluminum etching method based on the compatible molybdenum-aluminum mixed acid etching solution.

Semisolid supplement compositions are disclosed comprising at least one non-ester nitrate compound and at least one isolated amino acid compound. The at least one isolated amino acid compound is a separate compound than the at least one non-ester nitrate compound. The composition contains at least about 0.05625 mg nitrate ion (NO3−).

The invention provides a novel D-A-D type fluorescent probe material as well as a preparation method and application thereof. The fluorescent probe material has good stability, the preparation process is simple, and the synthesis condition is mild. Moreover, the D-A-D type fluorescent probe material has good solubility and stability, and a complex of the D-A-D type fluorescent probe material and zinc ions can identify pyrophosphate ions with high selectivity and high sensitivity. The interference of phosphate ions, hydrogen phosphate ions, dihydrogen phosphate ions, fluorine ions, chloride ions, nitrate ions, acetate ions, sulfate ions and carbonate ions is avoided; after the zinc ion complex of the D-A-D type fluorescent probe material is combined with PPi, the fluorescence intensity is remarkably enhanced, the D-A-D type fluorescent probe material has a higher signal-to-noise ratio, in-situ imaging detection of a target object in living cells or tissues is realized, the defects of a traditional molecule and ion detection method are overcome, and the D-A-D type fluorescent probe material is suitable for being widely applied to the field of biological imaging. # imgabs0 #

The present application relates to a fast-infiltration agricultural and forestry non-point source interception device, which relates to the field of agricultural and forestry non-point source pollution control, including a flow ditch and two sedimentation tanks, the flow ditch and the two sedimentation tanks are connected by a three-way drainage pipe, a mechanical filter structure and an ecological filter structure are arranged in the flow ditch, a partition is installed in the middle of the sedimentation tank, and the sedimentation tank is divided into an anaerobic tank and an aerobic tank by the partition; a plurality of baffles are arranged in the anaerobic tank for retaining polluted water sources and performing anaerobic decomposition; a plurality of vertical biofilm decomposition tubes are arranged in the aerobic tank for degrading N and P pollutants in the polluted water sources. The present invention arranges an anaerobic tank and an aerobic tank in the sedimentation tank, nitrate ions and phosphorus ions can be preliminarily decomposed in the anaerobic tank, and aerobic bacteria are planted in the aerobic tank, which can promote the decomposition or sedimentation of N and P ions in the polluted water sources, thereby removing N and P ions in the polluted water sources.

The invention relates to a preparation method and application of a two-dimensional ultrathin porous nitrogen-doped carbon composite material. According to the invention, a metal salt nitrate ion mediation method is adopted, and the ultrathin porous carbon nanosheet loaded with metal single atoms and metal nanoparticles is successfully prepared through decomposition of a prepolymerized dopamine-metal salt precursor. By changing the type of metal salt ligand anions, accurate regulation and control between a non-porous structure and a porous structure can be realized. Endogenous multi-scale pore defects are introduced into the surface of the carbon nanosheet, so that the impedance matching of the prepared carbon nanosheet system is effectively improved, and meanwhile, high conductivity is kept. According to the prepared material, the dielectric constant is improved by introducing a porous structure, impedance matching is optimized, and the electromagnetic wave absorption capacity is improved.

Described herein are methods of treating and / or alleviating a cytokine-mediated inflammatory disorder, such as gum disease, in a subject in need thereof, comprising applying an oral care composition to an oral cavity of the subject, the oral care composition comprising a stannous ion source; a nitrate ion source; and a water-soluble alkali metal polyphosphate source; and at least 10% water, by weight of the composition. Methods for treating and / or alleviating gum diseases are also described herein.

The invention discloses a nitric acid-hydrofluoric acid type stainless steel pickling waste liquid resource utilization method, and belongs to the technical field of waste water resource utilization. The method comprises the steps of precipitation reaction, manganese sand filtration, electrodialysis, reverse osmosis and evaporative crystallization. Firstly, mixed precipitates are obtained through precipitation reaction; concentrating the obtained filtrate by adopting an electrodialysis technology, and recovering by adopting an evaporative crystallization mode to obtain a sodium nitrate product; and the produced water can meet the requirement of make-up water (GB / T 19923-2024) of a circulating cooling water system through a reverse osmosis technology. According to the method, the technologies of chemical precipitation, membrane separation, evaporative crystallization and the like are comprehensively adopted to extract and recover iron ions, fluorine ions, nitrate ions and the like in the stainless steel pickling waste liquid in the form of inorganic matters, and meanwhile, produced water in the recovery process reaches the standard of circulating cooling water. According to the method, the stainless steel pickling waste liquid can be recycled, meanwhile, produced water is recycled, and pollution to the environment is reduced.

The invention relates to the technical field of preparation of iridium trichloride, in particular to a preparation method of high-purity iridium trichloride. Methanol, normal propyl alcohol and the like are added into reaction liquid obtained after ammonium chloroiridate and aqua regia are mixed and dissolved to serve as organic additives for nitrate removal, nitrate reacts with nitrate in the solution to generate gas, and nitrate ions are removed from the solution. Meanwhile, the added organic additives are all alcohol substances which are easy to remove and are extremely easy to volatilize in the subsequent reaction heating process, so that impurities which are difficult to remove cannot be introduced into a reaction system while nitrate is effectively removed, and the purity of a final product can be improved. Organic reducing agents with weak reducibility, such as oxalic acid, citric acid, vitamin C and sulfur dioxide, are used for carrying out reduction reaction, so that iridium powder cannot be separated out in the process of reducing tetravalent iridium, and the purity of trivalent iridium can be ensured. The crystal form of the obtained high-purity iridium trichloride is a beta form, and the purity of the high-purity iridium trichloride is greater than 99.997%.

A microcapsule containing vitamin C and nitrate, said capsule comprising a wall material and a core material encapsulated in the wall material. The wall material comprises pectin and sodium carboxymethyl cellulose, and the core material comprises vitamin C, nitrate, and chitosan. The raw materials of the microcapsule comprise, in parts by weight: pectin 0.7-1.2 parts by weight, sodium carboxymethyl cellulose 0.7-1.2 parts by weight, chitosan 1 part by weight, and vitamin C and nitrate in a total amount of 0.3-1.2 parts by weight, the molar ratio of vitamin C to nitrate ions being 1:1-1:5. A use of the microcapsule in the preparation of a drug for preventing and / or treating damage to the salivary glands caused by radiation therapy, in particular a use in the preparation of a drug for preventing and / or treating damage to the salivary glands caused by radiation therapy for nasopharyngeal carcinoma.

The invention relates to a flue gas carbon and pollution reduction short-process collaborative treatment device and method, and belongs to the field of flue gas treatment. The device comprises a flue gas oxidation absorption module and a carbon pollution absorption liquid electrolysis conversion module; the flue gas oxidation absorption module is used for carrying out catalytic oxidation on sulfides and nitrides in the flue gas through an oxidation catalyst to form sulfur dioxide and nitrogen dioxide, and the sulfur dioxide is absorbed through an absorbent; nitrogen dioxide and carbon dioxide in flue gas are converted into carbon dirt absorption liquid containing carbonate ions, bicarbonate ions, nitrite ions and nitrate ions through potassium hydroxide absorption liquid, and finally the carbon dirt absorption liquid is electrolyzed through the carbon dirt absorption liquid electrolysis conversion module to form ethylene, methylamine and urea. And the energy intensive processes such as capture liquid regeneration and gas purification and compression are omitted, the carbon and pollution reduction treatment process of carbon dioxide and multiple pollutants in the flue gas is shortened, the energy consumption is reduced, and the treatment efficiency is improved.

To provide a promoter for proliferation of nitrate-reducing bacteria in the oral cavity, which enables selective proliferation of nitrate-reducing bacteria in the oral cavity.SOLUTION: A promoter for proliferation of nitrate-reducing bacteria in the oral cavity comprises one or more selected from the group consisting of glycyrrhetinic acid, glycyrrhizic acid, and salts thereof. Preferably, the nitrate-reducing bacteria to be proliferated include one or more species selected from the group consisting of bacteria of the genus Neisseria and bacteria of the genus Haemophilus. The promoter further comprises a nitrate ion-supplying compound. The promoter serves as an agent for preventing or improving dental caries or an agent for periodontal disease.SELECTED DRAWING: None

A solid supplement composition comprising at least one non-ester nitrate compound and at least one isolated amino acid compound, wherein the at least one isolated amino acid compound is citrulline, wherein the at least one isolated amino acid compound is a separate compound than the at least one non-ester nitrate compound, and wherein the solid supplement composition comprises an amount of nitrate ion (NO3—) that is at least 0.33125 mg.

The invention relates to the technical field of analytical chemistry, in particular to an ion chromatography method for separation and detection of acetate, nitrite and nitrate ions in a complex matrix culture medium. The method mainly solves the problems of insufficient separation degree, serious matrix interference, poor detection precision and reproducibility and the like when the conventional ion chromatography technology is used for detecting a complex matrix culture medium.

The invention discloses a positive electrode material and a preparation method thereof, an electrochemical device and an electronic device, the positive electrode material comprises a lithium element, a sodium element and nitrate ions, and based on the mass of the positive electrode material, the mass ratio of the nitrate ions is 0.001%-0.2%. The high-temperature cycling stability, the capacity utilization rate and the dynamic performance of the electrochemical device are improved, and meanwhile the impedance of the electrochemical device is reduced.

Solid supplement compositions are disclosed comprising at least one non-ester nitrate compound and at least one isolated amino acid compound. The at least one isolated amino acid compound is a separate compound than the at least one non-ester nitrate compound. The composition contains at least about 0.05625 mg nitrate ion (NO3−).

The invention provides a solid electrolyte, a preparation method and a lithium battery, the solid electrolyte comprises a nitrate ion liquid-based metal organic framework C, polyoxyethylene and LiTFSI, the nitrate ion liquid-based metal organic framework C accounts for 3wt% of the polyoxyethylene, and the molar ratio of the polyoxyethylene to the LiTFSI is 10: 1; wherein the nitrate ion liquid-based metal organic framework C has a nitrogen-containing heterocyclic ring, and nitrate ions and Zn ions are coordinated on the nitrogen-containing heterocyclic ring. In the solid electrolyte provided by the invention, nitrogen-containing heterocyclic cations in the nitrate ionic liquid-based metal organic framework have a binding effect on TFSI-anions in the lithium salt, and meanwhile, dissociation of the lithium salt is promoted, so that lithium fluoride is generated in situ. Moreover, nitrate ions obtain electrons on the surface of the lithium metal negative electrode, and the electrons and lithium ions form lithium nitride in situ on the SEI layer, so that deposition of dead lithium is reduced, and finally, the interface stability of the battery is remarkably improved.

The invention provides an electrolyte additive and application thereof, the electrolyte additive comprises a pyrrolidine nitrate compound, and the pyrrolidine nitrate compound has a structure as shown in a formula I: # imgabs0 # formula I, wherein R1, R2, R3, R4, R5 and R6 are respectively and independently selected from one of hydrogen, halogen, linear alkyl, substituted linear alkyl, branched alkyl, substituted branched alkyl, alkoxy, substituted alkoxy, heterocyclic group, substituted heterocyclic group and the like. According to the electrolyte additive disclosed by the invention, the nitrate anions and the pyrrolidinyl cations are contained, and the nitrate anions can form SEI on a negative electrode to improve the stability of a negative electrode interface and enter a solvation structure of lithium ions in the electrolyte to reduce the desolvation energy of the lithium ions; meanwhile, nitrate ions and pyrrolidinyl cations both have excellent oxidation resistance and can be compatible with a high-voltage positive electrode, so that the fast charging performance of the battery is improved on the premise of not sacrificing the service life of the battery.

A nitrogen-based gas discharge device 100 according to one aspect of the present invention includes: a green compact 111 containing a powder of a layered double hydroxide in which nitrite ions (NO2 -) are included between layers, and a powder of a reducing agent or a precursor thereof; and a gas discharge module 110 disposed so as to cover the green compact 111 and composed at least of a film 112 that is waterproof and has water vapor permeability and gas permeability. The solubility of the reducing agent in water at room temperature is 1 g / 30 mL or more and the pH of a 0.1 (w / v)% aqueous solution of the reducing agent at room temperature is 5.1 or less. The nitrogen-based gas discharge device 100 may also include a water-containing body 120 for supplying water vapor to the nitrogen-based gas discharge module 110.

A system for photocatalytic synthesis of urea includes an aqueous solution and a photocatalytic device immersed in the aqueous solution. The photocatalytic device includes a substrate having a surface, and a conductive structure supported by the substrate at the surface, the conductive structure including a nitride interface in contact with the aqueous solution. The aqueous solution includes nitrate ions and dissolved carbon dioxide for synthesis of urea at the nitride interface of the conductive structure.

Provided is an analysis device and an analysis method which, while solving the problem of column plugging, carries out continuous analysis of nitrogen in a sample without use of cadmium that causes environmental pollution. The problem is solved by an analysis method including: a sample introduction step of introducing a sample into a tube; a reduction step of reducing, to ammonium ions, nitrate ions and nitrite ions in the sample being transferred in the tube; and an analysis step of analyzing the ammonium ions in the sample which have been generated in the reduction step. In the reduction step, the nitrate ions and the nitrite ions in the sample are reduced by transferring the sample in a hollow tube in which at least an inner wall surface is made of zinc.

The invention belongs to the technical field of plant genetic engineering, and particularly discloses a nitrate ion transport channel gene PbrSLAH3b and application of the nitrate ion transport channel gene PbrSLAH3b in promoting growth of pear pollen tubules. The method comprises the following steps: extracting total RNA (Ribonucleic Acid) of Dangshan pears from pollen of Dangshan pears; carrying out reverse transcription on the RNA to obtain cDNA (complementary deoxyribonucleic acid); and by taking the cDNA as a template, carrying out amplification to obtain the pear pollen tube nitrate transport channel gene PbrSLAH3b, the PbrSLAH3b gene provided by the invention belongs to a slow anion channel SLAC / SLAH family member, the PbrSLAH3b is remarkably up-regulated in expression in the early growth stage of a pollen tube, and the PbrSLAH3b is positioned in a plasma membrane. The invention verifies that PbrSLAH3b can form a functional anion channel with NO3 <-> selectivity under the condition of not depending on proton gradient or phosphorylation state, and the PbrSLAH3b has relatively strong selectivity on NO3 <->. Therefore, the PbrSLAH3b gene can mediate the absorption and transport of the pollen tube to NO3 <-> and maintain the polarity growth directivity of the pollen tube, and has important application value for revealing the ion regulation mechanism of the growth of the fruit tree pollen tube and improving the reproductive development of the fruit tree.

The invention provides an NOx treatment system and method based on plasma activated water, and relates to the technical field of industrial waste gas treatment. The method comprises the following steps: acquiring waste gas containing nitrogen oxide NOx; according to the method, plasma activated water containing an oxidizing agent is used for spraying exhaust gas containing NOx to absorb NOx, the oxidizing agent and NOx are subjected to an oxidation-reduction reaction in the plasma activated water, and reaction products comprise nitrate ions dissolved in water. The plasma activated water containing the oxidizing agent is used for spraying the waste gas containing NOx, and NOx is effectively removed. Meanwhile, the activation reaction module can be integrated in the industrial waste gas treatment module, so that zero increase of the occupied land cost of NOx removal is realized. The plasma activated water device can be integrated into the semiconductor plasma waste gas treatment system, and the denitration targets of zero reagent addition, zero wastewater discharge and zero land occupation cost increase are achieved while semiconductor waste gas is efficiently treated.

The invention discloses an electrolyte additive of a lithium metal battery, an electrolyte thereof and a lithium ion battery. The electrolyte additive provided by the invention comprises a cationic organic large group and an anionic nitrate ion organic nitrate additive. NO32 in the structure can be preferentially reduced on the lithium metal negative electrode side to generate high-quality SEI rich in inorganic compounds. Then, the organic cation large groups inhibit the growth of lithium dendrites while maintaining the lithium nucleation rate through the characteristic adsorption effect, and finally uniform spherical deposition morphology is obtained.

The invention discloses chitosan / hyaluronic acid hydrogel based on nitrate ion regulation and control and a preparation method and application thereof, the preparation method comprises the following steps: (1) heating and stirring sodium hyaluronate in water until the sodium hyaluronate is completely dissolved, then adding chitosan, and stirring to uniformly disperse the chitosan; (2) slowly dropwise adding a glacial acetic acid solution into the solution obtained in the step (1) to completely dissolve the chitosan, and continuously stirring to react for 20-50 minutes; (3) standing and drying the reaction liquid obtained in the step (2) to form a hydrogel film; (4) soaking the dried hydrogel film in a solution containing nitrate ions, then repeatedly cleaning with deionized water until the pH value of water is neutral, and then drying; based on the anion effect, the structure and performance of the hydrogel are adjusted through nitrate ions, and the hydrogel composite membrane soaked with nitrate has excellent mechanical performance, swelling performance and good drug loading and releasing performance and can be used in the fields of drug loading and dressing.

The invention discloses a preparation method and application of an all-solid-state ion selective microelectrode, and belongs to the field of ion selective electrodes. A composite material with the mass ratio of super-hydrophobic carbon nanotubes to CoWSe2 being 3: 1 is used as an ion-electron transduction layer material for constructing the all-solid-state ion selective microelectrode, and a nitrate ion selective polymer film or a hydrogen ion selective polymer film is respectively dispensed on the surface of the transduction layer; and drying to obtain the all-solid-state nitrate ion selective microelectrode or all-solid-state hydrogen ion selective microelectrode. According to the method disclosed by the invention, the all-solid-state ion selective microelectrode can more effectively inhibit the formation of a water layer, so that the microelectrode has better potential stability and longer service life when being applied to the detection of ions in an environmental water body sample.

The application discloses a scandium-based MOF crystal material, a preparation method and application thereof. The MOF crystal is formed by [Sc3(mu2-OH)3(CO2)4O6] n The three-dimensional porous framework structure is formed by the mutual connection of an inorganic metal chain, 2,5-thiophene dicarboxylic acid and a nitrate ion, is directly synthesized by a solvothermal reaction with a metal Sc based on the ligand 2,5-thiophene dicarboxylic acid, and has relatively mild, simple and easy reaction conditions. The MOF crystal has high crystallinity, excellent thermal stability, water stability, solvent stability and wide pH stability. Under normal temperature and pressure, C3H6 is preferentially adsorbed, then C2H6, and finally C2H4, and the MOF crystal has good C3H6 / C2H4 and C2H6 / C2H4 separation performance, thereby obtaining high-purity C2H4 and recovering C3H6, and can be applied to the effective separation of C2H4 and C3H6 in a methanol-to-olefin (MTO) mixture.

The invention discloses a method for separating rhenium from a rhenium-rich solution containing molybdenum and tungsten. The method comprises the following steps: extracting a rhenium-rich raw material solution containing ReO4 <-> and impurity ions by using an extraction agent containing hydrophobic ionic liquid to obtain an organic extraction phase containing ReO4 <-> and a raffinate phase containing the impurity ions; wherein the solvent of the raw material solution is water, and the impurity ions comprise one or two of MoO4 < 2-> and WO4 < 2->; the hydrophobic ionic liquid is composed of positive ions and negative ions, the anions are selected from one or more of halide ions, borate anions, carboxylate anions, carbonate anions, nitrate ions, nitrite ions, sulfate anions, sulfite anions, sulfonate anions, phosphate anions, phosphite anions, thiocyanate anions and amino acid ions. The method is high in separation efficiency, simple in technological process, easy to amplify, small in extraction agent loss, capable of being recycled and suitable for industrial production.