215 results about "Nitrate salts" patented technology

This invention discloses a silver-cobalt composite oxide catalyst, its preparation method, and its application in the electrocatalytic reduction of nitrate to ammonia, relating to the field of electrochemical catalyst technology. The invention involves dissolving silver nitrate and cobalt nitrate hexahydrate in deionized water, stirring until completely dissolved, adding citric acid as a complexing agent, and continuing stirring to form a homogeneous and stable metal complex solution. The metal complex solution is continuously stirred under heating conditions to allow the solvent in the system to gradually evaporate, forming a viscous gel, which is then dried to obtain a catalyst precursor. The catalyst precursor is ground and placed in a high-temperature furnace for programmed temperature calcination in air, followed by cooling to room temperature to obtain the target catalyst. The preparation method of this invention is simple and controllable, with abundant and inexpensive raw materials, requiring no complex equipment or harsh reaction conditions, and is easy to scale up for industrial production. The obtained catalyst exhibits extremely high catalytic activity and selectivity for the electrocatalytic reduction of nitrate to ammonia, with a high ammonia yield.

This utility model discloses an oxygen denitrification treatment device for aquaculture water, including a treatment tank. The treatment tank is equipped with a filtration zone, an aerobic biological zone, an anoxic biological zone, and a degassing zone. The filtration zone is filled with quartz sand filter media. The aerobic biological zone contains biological packing material and has a jet aeration ring on its outer wall, which is connected to an ozone-oxygen mixture generator. The anoxic biological zone is filled with porous ceramsite packing material. The degassing zone has a guide plate inside. In this utility model, the aquaculture water can be filtered for suspended particulate matter through the quartz sand filter media. The jet aeration ring can introduce ozone-oxygen mixture gas, which, together with the honeycomb biological packing material, can complete ammonia nitrogen oxidation. The denitrifying bacteria on the surface of the porous ceramsite packing material can convert nitrates into nitrogen gas. Finally, the gas is separated by the guide plate, and the purified water can be discharged from the outlet. Thus, through the above structure, efficient denitrification, oxygenation, and purification of aquaculture water can be achieved, improving water quality treatment efficiency and stability.

This invention discloses a process for preparing ultrafine glass powder using a spray pyrolysis method in the field of glass encapsulation materials. The process first prepares a homogeneous solution A using boric acid, aluminum nitrate nonahydrate, alkaline earth metal nitrates, lithium acetate, sodium acetate, and potassium acetate. Tetraethyl orthosilicate is dissolved in anhydrous ethanol to obtain solution B. A rare earth transition metal composite oxide nanoclusters encapsulated with a silica shell hybrid inorganic modifier is dispersed in anhydrous ethanol to obtain suspension C. Solution B and suspension C are mixed, and deionized water and hydrochloric acid are added to adjust the pH. After pre-hydrolysis and cooling, triethyl borate is added dropwise for co-condensation, and then mixed with solution A. After adjusting the pH and aging, the mixture is ultrasonically atomized and spray pyrolyzed to obtain ultrafine glass powder. The glass powder obtained by this invention has small particle size, high sphericity, and can be continuously produced.

The application discloses a high-salt-resistant denitrifying bacterial strain and a microsphere preparation thereof, a preparation method and application thereof, relates to the technical field of environmental microorganisms and wastewater biological treatment. Pseudomonas sp. The classification name of the strain is Pseudomonas sp., the preservation number is CGMCC No. 36626, the strain is preserved in the China General Microbiological Culture Collection Center, and the preservation date is November 14, 2025. The preparation method of the microsphere preparation containing the strain comprises the following steps: carrying out strain amplification culture to obtain a bacterial liquid, mixing the bacterial liquid with porous starch and a protective agent, then performing vacuum freeze drying to obtain bacterial powder, and then mixing the bacterial powder with a sodium alginate solution, and dropping the mixture into a calcium chloride solution to obtain the microsphere preparation. The microsphere preparation can maintain a nitrate nitrogen removal rate of more than 80% after being stored at-18 to-22 DEG C or 20 to 25 DEG C for 28 days, and can be used for denitrification and nitrogen removal of low-carbon-nitrogen-ratio and high-salt wastewater (such as urine wastewater in a closed circulation system).

This invention provides a precise method for detecting phosphorus content in high-matrix copper-phosphorus alloys, belonging to the field of chemical analysis technology for metallic materials. The detection method of this invention includes the following steps: S1: Sample pretreatment; S2: Sample dissolution and volume adjustment; S3: Solution pretreatment: Nitric acid, hydrochloric acid, and deionized water are added to the solution and boiled to remove volatile impurities; S4: Precipitation formation: Ammonia water is added to the solution to adjust the pH to 8.5-9.5, and ammonium citrate-EDTA masking agent is added; quinomolybdate-limonene precipitant is slowly added under simmering conditions, and boiling is carried out for 10-15 minutes with intermittent stirring to ensure complete phosphorus precipitation; S5: Filtration, washing, drying, and weighing; S6: Calculation of phosphorus content. Compared with existing technologies, this invention, through a unique combination scheme, suppresses the hydrolysis of copper ions and the interference of coexisting elements, enabling precise detection of phosphorus content in high-matrix copper-phosphorus alloys. It has advantages such as strong resistance to matrix interference, high detection accuracy, good reproducibility, wide applicability, low detection cost, and simple operation.

The application discloses a kind of foam nickel load iron nickel bimetallic phosphide heterojunction catalyst and its preparation method and application, belong to electrocatalytic material technical field.The application is in situ grown by hydrothermal deposition in combination with low-temperature phosphorization process, and is prepared on foam nickel base Phosphide iron / Phosphide nickel heterojunction catalyst (Fe2P / Ni2P@NF).The prepared catalyst shows excellent performance in the electrocatalytic reduction of nitrate synthesis ammonia and high nitrate wastewater degradation.The preparation process of the catalyst of the application is simple, low in cost, and little to environmental pollution, and the self-supporting electrode prepared by integration can be directly applied to proton exchange membrane electrolytic cell, and has wide application prospect.

1. The name of the design product: full-spectrum multi-parameter water quality online analyzer (SECCO-L-1905). 2. The use of the design product: for analyzing and detecting key water quality indicators such as total phosphorus, total nitrogen, COD, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, etc. in water, online monitoring, fixed and mobile monitoring of water quality in "source-net-plant-river" multiple scenes, and water pollution prevention and supervision. 3. The design points of the design product: the combination of the shape and pattern of the product as a whole. 4. The picture or photo that best indicates the design points: perspective view 1.

The utility model relates to a wastewater denitrification and desulfurization treatment device which is characterized in that a water distributor is arranged at the lower part of an anaerobic reaction tank of an anaerobic reactor, a three-phase separator is arranged at the upper part of the anaerobic reaction tank of the anaerobic reactor, and a stirrer is arranged on an anoxic reaction tank of an anoxic reactor; an overflow port of the anaerobic reaction tank is connected and communicated with the anoxic reaction tank, a reflux port of the anaerobic reaction tank is connected and communicated with the anaerobic reaction tank through a wastewater reflux pipe, an aerator is arranged at the bottom of an aerobic reaction tank of the aerobic reactor, the anoxic reaction tank is connected and communicated with the aerobic reaction tank, a partition plate is arranged in the settling pond, a water inlet area is arranged on one side of the partition plate, and a settling area is arranged on the other side of the partition plate. A clear liquid outlet pipe is arranged at the upper part of the inclined plate of the sedimentation tank, a communicated clear liquid return pipe is arranged at the front part of the clear liquid valve of the clear liquid outlet pipe, and the clear liquid return pipe is communicated with the anoxic reaction tank. According to the device, the sulfate radical removal rate is high, nitrate in the wastewater can be simultaneously removed while sulfate radicals in the wastewater are removed, and the equipment investment and the treatment cost are reduced.

This disclosure provides an electrolytic cell device and method for simultaneously achieving desalination and electrocatalytic nitrate reduction, belonging to the field of electrochemical technology. The device uses activated carbon (AC) as the anode and a halogen-modified copper electrode as the cathode, physically separated into two electrochemically coupled chambers by a metal Pt or activated carbon interlayer. For the first time, it couples the electrocatalytic nitrate reduction to ammonia (NRA) module and the desalination module into an integrated system. This device can simultaneously achieve highly efficient desalination and electrocatalytic nitrate reduction, with a desalination rate reaching 188 μg / cm³. ‑ ²min ‑ ¹, Ammonia yield reached 1.16 mgh ‑ ¹cm ‑ ², adaptable to a wide salinity range, solving the problems of low desalination rate and narrow salinity adaptability in existing coupled systems, and achieving efficient synergy between nitrate resource recovery and seawater desalination. This disclosure is applicable to the treatment of marine wastewater or industrial wastewater containing nitrates.

The present invention relates to a composition comprising at least one amine selected from the group consisting of N,N,N',N'-tetramethylethylenediamine, N,N,N',N'- tetramethylpropylenediamine, 1,8-diazabicyclo[5.4.0]undec-7-ene, N,N- dimethylethylenediamine, 4-methylmorpholine, dimethyl-(2-azidoethyl)amine and mixtures thereof; at least one organic solvent selected from the group consisting of acetonitrile, dimethyl isosorbide, acetone, dimethylsulfoxide, and mixtures thereof; and at least one carboxylic, nitrate, or sulfate salt of a transition metal; wherein the transition metal is completely dissolved in the composition. The invention also relates to hypergolic compositions and uses thereof.

This invention discloses the application of a salt-tolerant immobilized denitrifying microbial agent in denitrification of low-temperature saline river water. The salt-tolerant immobilized denitrifying microbial agent is placed in a net bag and evenly suspended in the river channel. The salt-tolerant immobilized denitrifying microbial agent uses zeolite as the immobilization carrier, and the immobilized microorganisms are salt-tolerant denitrifying microbial agents enriched and screened from rivers flowing into the sea. The dosage of the salt-tolerant immobilized denitrifying microbial agent is 2 g·L⁻¹. ‑1 The dosage is the mass-to-volume ratio of the immobilized denitrifying bacterial agent to the river water. The low-temperature saline river water is saline river water with nitrate nitrogen as the main pollutant. The temperature of the low-temperature saline river water is 10℃~25℃. During the denitrification process, a carbon source is added to the river water to maintain denitrification efficiency. This invention has demonstrated its feasibility in practical engineering applications through pilot-scale experiments. It can effectively remediate river pollution and solve the problem of severe and difficult-to-remediate water pollution in saline rivers.

A preparation method of a medium-entropy perovskite oxygen carrier comprising: 1) preparing an aqueous solution from metallic nitrate serving as a raw material, performing a coprecipitation reaction w

The application relates to the technical field of organic liquid hydrogen storage, and discloses a catalyst, a preparation method thereof and application of the catalyst in organic liquid hydrogenation reaction. The preparation method comprises the following steps: (1) mixing a composite solution containing nickel salt, aluminum salt and M salt, an organic acid, a dispersing agent and a mesoporous template to form a mixed solution; (2) performing spray drying and combustion on the mixed solution, collecting by high-voltage electrostatic force, pre-reducing and passivating to obtain an activated carrier; and (3) dispersing the activated carrier in a solvent to obtain a dispersion liquid, mixing the dispersion liquid with a noble metal precursor and a competitive adsorbent, performing first drying, calcination and reduction in sequence after evaporative dehydration. The nickel salt, the aluminum salt and the M salt are nitrate salts; M is at least one selected from cerium, zirconium, lanthanum and zinc; in the step (1), the total molar content of metal elements is that the content of nickel is 5-15%, the content of aluminum is 80-90%, and the content of M is 5-10%. The preparation method is simple, and the obtained catalyst has high activity and high stability.

The application belongs to the field of urea catalytic preparation, and particularly relates to an electrode for electrocatalytic synthesis of urea and a preparation method and application thereof. The preparation method of the electrode for electrocatalytic synthesis of urea comprises the following steps: performing solvothermal treatment on a mixed solution containing graphene oxide, a water-soluble copper source and a water-soluble bismuth source to realize reduction of the graphene oxide and loading of a Bi2O3 / Cu2O composite heterojunction, thereby obtaining a Bi2O3 / Cu2O-rGO active material; compounding the Bi2O3 / Cu2O-rGO active material on a current collector to form a precursor electrode; and performing electro-reduction on the precursor electrode in a modified electrolyte to obtain the electrode; the modified electrolyte is an aqueous solution of a water-soluble carbonate and a nitrate; and the potential of the electro-reduction is -0.4 to -0.7 V. The electrode has excellent urea catalytic performance, the Faraday efficiency of which can reach 45%, and the yield can reach 550 µg h ‑1 mg cat ‑1 .

The present disclosure relates to a method and a system to increase the dissolved oxygen content in a water body having a dissolved oxygen content of between 0 mg / l and 4 mg / l, or to anticipate a future drop of a dissolved oxygen content of a water body to between 0 mg / l and 4 mg / l, wherein the water body is non-stratified, or is stratified and comprises at least an epilimnion, wherein the method comprises a step a, wherein a stream of diluted aqueous nitrate containing liquid droplets of which at least part are diluted oxygenated aqueous nitrate containing liquid droplets are formed, and a subsequent step b, wherein the diluted aqueous nitrate containing liquid droplets of which at least part are oxygenated diluted aqueous nitrate containing liquid droplets are further spread, in case of a non-stratified water body, in a part of the water body or in the whole water body, and in case of a stratified water body, in a part of the epilimnion of the water body or in the whole epilimnion of the water body.

This invention relates to the field of oil well cementing technology, and discloses a slow-release nano-early strength agent, its preparation method, and cement slurry. The slow-release nano-early strength agent includes a carrier and an early strength agent loaded on the carrier. The carrier comprises halloysite nanotubes, and the early strength agent comprises one or more of chloride, sulfate, nitrate, and organic compounds. The weight ratio of the early strength agent to the carrier is (5-30):100. This invention utilizes the unique cavity structure of halloysite nanotubes and the strong interfacial interaction with cement to synthesize a slow-release nano-early strength agent, thereby improving the early strength of cement and extending the cement thickening time.

The application discloses a method for determining complete transformation of complex Am-based nitrate solution under a radioactive system, and belongs to the technical field of radioactive waste liquid treatment. The method for transforming the radioactive Am-based nitrate solution comprises the following steps: concentrating the radioactive Am-based nitrate solution to obtain nitrate concentrate solid; and then calcining the nitrate concentrate solid at 700-750 DEG C. Meanwhile, the application also provides a method for determining complete transformation of complex Am-based nitrate solution under a radioactive system. The application solves the problem of how to transform the long-life and high-toxicity transuranium element stream into an oxide; the method is beneficial to temporary storage of the element, facilitates reuse of the element in the future, and provides a method for identifying whether the transformation of the element nitrate solution is complete or not.

Provided is a separator used for a secondary battery. The separator may comprises a complex-containing layer which is provided on a surface in contact with a negative electrode of the secondary battery and which contains an electrolyte complex. The electrolyte complex may contain a nitrate and a coordination substance. The nitrate may include at least one selected from lithium nitrate, potassium nitrate, cesium nitrate, sodium nitrate, silver nitrate, calcium nitrate, zinc nitrate, copper nitrate, magnesium nitrate, indium nitrate, aluminum nitrate, ammonium nitrate, barium nitrate, and iron nitrate.

This invention relates to an anaerobic biological treatment device and operating method for sulfate-containing organic wastewater, belonging to the field of industrial wastewater treatment technology. It includes an inlet tank, a main inlet pipe, a main reaction zone, an external circulator, an automatic dosing device, and a nitrate-containing wastewater storage tank. The inlet tank is connected to one end of the main inlet pipe via a second connecting pipe, and the other end of the main inlet pipe is connected to a water distributor located in the main reaction zone. The main reaction zone is connected to the external circulator via a first connecting pipe, and the external circulator is connected to the main inlet pipe via a third connecting pipe. An automatic dosing device is installed at the top of the external circulator, and the nitrate-containing wastewater storage tank is connected to the external circulator via a fourth connecting pipe. An aeration head is installed at the bottom of the inner cavity of the external circulator. This invention separates the aeration zone and the main reaction zone, avoiding sludge leakage caused by direct aeration, maintaining the stability of the anaerobic system, and features a simple structure, adjustable parameters, and a wide range of applications.

The application particularly relates to a harmless treatment method of nitrate wastewater based on microwave-assisted catalytic reduction, and the technical scheme is as follows: according to the mass ratio of catalyst to nitrate wastewater of 0.001-0.1:1, the catalyst is added into the nitrate wastewater to obtain a mixed solution; then 1-5wt% of a cavity scavenger in the mixed solution is added into the mixed solution, hydrochloric acid is used to adjust the pH of the mixed solution to 1-6, the mixed solution is stirred in a dark room for 1-2h to obtain a suspension I; then the suspension I is placed into a microwave reaction device, and is reacted under the microwave irradiation of 0.3-20GHz for 60-120min to obtain nitrogen gas based on the harmless treatment of the nitrate wastewater by the microwave-assisted catalytic reduction. The application has the advantages of simple operation, low cost, low energy consumption, and the prepared catalyst can be repeatedly used and easily used in large scale, the method has high conversion rate of nitrate, no secondary pollution, high selectivity of target product, and can realize the harmless removal of nitrogen.

To enable more accurate measurement of nitrate nitrogen concentration in plants through non-destructive inspection.SOLUTION: A nitrate nitrogen concentration measurement method provided herein comprises irradiating a leaf blade 100 of a plant with first ultraviolet light L1 of a wavelength in a range of 280-320 nm to measure the amount of light transmitting through the leaf blade 100, and then calculating nitrate nitrogen concentration in the leaf blade 100 based on the amount of the transmitted first ultraviolet light L1.SELECTED DRAWING: Figure 2

The application discloses a supported bimetallic-based two-dimensional nanometer catalytic material and a preparation method and application thereof, and relates to the technical field of catalysts. The preparation method comprises the following steps: preparing a monolayer structure or a few-layer structure of a plasmonic nanosheet; dispersing the plasmonic nanosheet in a solvent and adding a copper source to prepare a first mixed solution; stirring the first mixed solution in an inert gas environment, and then performing freeze-drying treatment and calcination treatment in a hydrogen atmosphere to prepare a nanosheet-Cu; adding HAuCl4 and HCl into the nanosheet-Cu in sequence, mixing, and then reacting under preset light irradiation conditions to prepare a supported bimetallic-based two-dimensional nanometer catalytic material nanosheet-Cu-Au. The application can realize the functional division and spatial cooperation of bimetallic active sites, promote the efficient generation, separation and directional transmission of photo-generated carriers, and thus improve the reaction efficiency and product selectivity of the co-reduction of nitrate and carbon dioxide to urea.

The present invention relates to a method for preparing a precursor material of a coated cathode active material comprising: (a) a step of preparing a solution containing a hydroxide, nitrate, acetate or alkoxide of a metal M with M other than lithium, (b) a step of contacting the particles of a precursor material of a cathode active material in the form of oxide, hydroxide or carbonate with the solution prepared in step a), (c) optionally a step of recovering the particles obtained at the end of step b), (d) a step of drying the suspension obtained at the end of step b) or optionally the particles recovered during step c) thereby obtaining a precursor material of a cathode active material coated by a layer based on metal M.The present invention also relates to the precursor material of a coated cathode active material thus prepared, its use in preparing a coated cathode active material and this cathode active material.

This invention relates to the field of wastewater biological treatment technology, specifically to a device and method for improving the autotrophic denitrification performance of a MABR reactor. It employs a composite membrane module combining a curtain-type silica gel filament membrane with excellent oxygen permeability with a spatial three-dimensional mesh packing material that facilitates the attachment of anaerobic ammonia-oxidizing bacteria, thereby coupling part of the nitrification reaction with the anaerobic ammonia oxidation reaction. Through the circulating reaction zone and membrane reaction zone within the reactor, nitrate nitrogen generated by anaerobic ammonia oxidation and excess nitrite nitrogen during instability adjustment are circulated and removed, thus improving the total nitrogen removal efficiency of the reactor. By adding appropriate amounts of sodium nitrite solution at appropriate times, the free nitrite concentration in the reactor mixture is increased. Simultaneously, the intermittent aeration ratio of the MABR is controlled to achieve synergistic inhibition of nitrite-oxidizing bacteria activity by low dissolved oxygen and high free nitrite, allowing the unstable short-range nitrification reaction to recover and improving the autotrophic denitrification performance of the reactor.

This invention relates to a device and method for rapidly starting a short-cut nitrification process, belonging to the field of water treatment. The invention involves inoculating a secondary sedimentation tank with sludge and adding a polyurethane biological sponge carrier into a sequencing batch reactor (SBR). First, a phased influent influent + incremental post-aeration strategy (increasing aeration time first, then increasing aeration rate) is adopted. This utilizes nitrate and a dynamic oxygen environment to drive the migration of *Candidatus Contendobacter* to the sponge carrier and complete its enrichment and acclimatization, reducing the obstruction of O2 on the endogenous denitrification process of *Candidatus Contendobacter* under aerobic conditions. The phased influent influent is then eliminated, and NH4 is introduced. + -N synthesis wastewater is treated using a low-alkalinity strategy (reducing influent KHCO3 concentration) + post-aeration with an initial increase followed by a decrease in aeration volume, combined with strong NO2 stimulation from Candidatus Contendobacter in a low dissolved oxygen environment. ‑ -N reducing power inhibits NOB growth, enabling rapid start-up of the short-cut nitration process.

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 beta alanine, 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 about 1 mg. A semisolid 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 beta alanine, 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 semisolid supplement composition comprises an amount of nitrate ion (NO3−) that is at least about 1 mg.