680 results about "Nitrate salts" patented technology

The invention relates to a vertical flow enhanced biological denitrification device and a sewage treatment method, a denitrification agent adding assembly is additionally arranged at a proper position of an existing vertical flow reaction device, namely the outer side of an outer inclined flow guide part, a corresponding enhanced denitrification agent can be added at a selected point position, a denitrification reaction is further enhanced, and the denitrification effect is improved. The selective reaction of the functional microorganism reaction is improved, nitrate generated by the anaerobic ammonia oxidation reaction is consumed, and a sufficient matrix is provided for anaerobic ammonia oxidation, so that the anaerobic ammonia oxidation reaction is greatly promoted, and the total nitrogen removal rate is further improved; by accurately controlling the dosing position and accurately dosing according to the reaction, the nitrogen removal efficiency of the autotroph is enhanced, the coordination of the minimization of the dosing amount of the medicament and the maximization of the nitrogen removal efficiency is realized, and finally, the green, low-carbon, economical and efficient nitrogen removal target of the sewage is achieved.

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.

A composite material for passive cooling includes a porous structure including an expanded graphite and a surfactant, the porous structure being provided with at least one crystalline deliquescent salt that is selected from the group consisting of chloride, bromide, sulphate, and nitrate. The uses of the composite material in passive cooling are also addressed.

The invention relates to the field of glass, in particular to lithium-free alkali aluminosilicate glass as well as a preparation method and application thereof. According to the glass, SiO2, Al2O3, Na2O, K2O, MgO and ZrO2 serve as main components, the content of Li2O is lower than 100 ppm, a nitrate-sulfate-carbon powder composite clarifying agent is adopted, the number of bubbles and the content of residual sulfur are effectively reduced, and use of a toxic or ultraviolet absorption type clarifying agent is avoided. ZrO2 is obtained by calcining a zirconium-based metal-organic framework material and is good in dispersity, and the devitrification resistance is improved. During float forming, through micro-positive pressure, high-purity protective atmosphere and four-zone gradient temperature control, the tin penetration depth is controlled within 15 microns, and the surface tin content is smaller than or equal to 4 micrograms / cm < 2 >. The obtained glass has high light transmittance, high hardness and excellent chemical strengthening performance, and is suitable for the high-end fields of electronic display cover plates, vehicle-mounted screens, touch panels, photovoltaic substrates and the like.

The invention discloses a preparation method of a controllable Co-Cu bimetallic oxide nano-catalyst, and the controllable Co-Cu bimetallic oxide nano-catalyst is applied to electro-catalysis, so that low-concentration nitrate pollutants in high-salinity wastewater can be efficiently removed. According to the preparation method, a constant-voltage electrodeposition method is utilized, the atomic-scale dispersed Co-Cu double-active-site catalyst is constructed on a foamed nickel substrate, and the prepared bimetallic Co-Cu active-site catalyst can remove low-concentration nitrate pollutants efficiently and highly selectively and is suitable for purification of nitrate wastewater with a wide pH range and different concentrations. The method is easy to operate, high in stability and good in electrocatalytic activity, and a reliable solution with practical application potential is provided for green low-carbon electrocatalytic purification of high-salt nitrate wastewater.

The application discloses a kind of microspheroidal high-entropy spinel type ferrite wave-absorbing materials and preparation method thereof, belong to electromagnetic wave absorbing material technical field, the preparation method includes with the designed molar ratio six metal nitrate is weighed and dissolved in deionized water, then add ammonium fluoride, urea, after stirring, the obtained solution is hydrothermal reaction at a certain temperature for a certain time to obtain precursor, the precursor is calcined to obtain microspheroidal high-entropy spinel type ferrite.The obtained wave-absorbing material is single-phase spinel structure, micron-sized spherical morphology, its chemical formula is MFe2O4;Wherein M=Co, Ni, Cu, Zn, Cr.The microspheroidal high-entropy spinel type ferrite wave-absorbing material and preparation method thereof are used, and the performance of pure ferrite wave-absorbing material can be effectively improved, with the characteristics of simple preparation, strong absorption performance, absorption frequency bandwidth.

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.

The invention discloses a method for realizing deep autotrophic nitrogen removal of sludge digestion liquid based on alternate intermittent aeration of a double-membrane aeration bio-membrane reactor (MABR). The process device comprises a sludge digestion liquid raw water tank, a single-stage double-MABR reactor, two MABR devices and a water outlet tank. According to the method, sludge digestion liquid enters the single-stage double-MABR reactor, the two MABR devices are alternately and intermittently aerated, the state of one aeration and one aeration stopping is always kept, and ammonia nitrogen in raw water is converted into nitrite through ammonia oxidizing bacteria enriched on the inner side of an MABR membrane. And simultaneously supplying to anaerobic ammonium oxidation bacteria enriched on the outer sides of the two MABR membranes through matrix diffusion for denitrification and generation of nitrate. Denitrifying bacteria enriched on the outer side of the MABR membrane utilize raw water organic matters to drive short-cut denitrification to synchronously supply nitrite to anaerobic ammonium oxidation bacteria so as to realize deep autotrophic nitrogen removal. According to the invention, a double-anaerobic ammonia oxidation reaction hot area is constructed through alternate intermittent aeration of double MABRs, and efficient deep autotrophic nitrogen removal of the sludge digestion liquid can be stably realized.

The invention discloses a bottom mud ecological restoration material as well as a preparation method and application thereof. The material is composed of a degradable carrier, a treatment flora and a multifunctional filler. The carrier is porous particles die-cast by corn straws and the like; the treatment flora comprises photosynthetic bacteria, bacillus and nitrifying bacteria; the filler is prepared from non-nitrate type hydrotalcite-like compounds, calcium nitrate, nitrate type hydrotalcite-like compounds and a flocculating agent according to a specific mass ratio. The preparation method comprises the following steps: carrying out pressure casting on the carrier, adsorbing the flora, and rolling the filler to form balls. The restoration method comprises the steps that a river channel is cut off in the dry season to form a closed area, materials are put according to the area ratio of 10: 1 for preliminary restoration, and after standing is conducted for 1-5 days, the materials are put along with water flow according to the area ratio of 2: 1 for deep restoration. Through the physical, chemical and biological synergistic effect, the sediment redox environment can be effectively improved, pollutant release and degradation are promoted, operation is easy and convenient, and the risk of secondary pollution is low.

The utility model discloses a device for treating deeper bottom mud in situ by utilizing gas stripping, and relates to the technical field of water environment pollution treatment. The device comprises a gas stripping lifting pipe and a water body moving device, a stirring machine is installed on the top face of the gas stripping lifting pipe in a sliding mode, a plurality of impellers are arranged at the output end of the stirring machine, a bottom mud backflow pipe is fixedly arranged on the outer surface of the gas stripping lifting pipe in a sleeved mode, and the bottom mud backflow pipe is installed on one side of the water body moving device in a sliding mode. A plurality of gas stripping mud pipes are arranged on the outer surface of the top of the gas stripping lifting pipe, deep bottom mud is subjected to gas stripping lifting, then reoxygenation and chemical adding are conducted, then the deep bottom mud returns to a bottom mud layer, a slow-release carbon source, a phosphorus removal chemical and nitrate are brought to the bottom mud layer with insufficient oxygen, and pollutants in the bottom mud are removed in situ. The loosening of the bottom mud layer can enhance the mass transfer rate in the bottom mud, and an anoxic environment is formed in the bottom mud layer. According to the in-situ bottom mud treatment device, in-situ bottom mud treatment is realized in a simple manner.

The invention relates to a CdS / denitrifying bacteria hybrid system as well as a construction method and application thereof, and relates to the technical field of water nitrate pollution treatment. Comprising composite denitrifying bacteria, Zn-doped CdS heterojunction nanoparticles loaded on the surface of the composite denitrifying bacteria, and an electronic mediator anchored at the interface of the heterojunction nanoparticles and a flora, the composite denitrifying bacteria are prepared from Stutzeria balearica CXK-1 and Stutzeria balearica GUA-1 according to the volume ratio of the Stutzeria balearica CXK-1 to the Stutzeria balearica GUA-1 to the Stutzeria balearica GUA-1 to the Stutzeria balearica GUA-1 being 1 to (0.8 to 1.2). The hybrid system can utilize photoelectrons to drive microbial denitrification under an illumination condition, so that the reduction of nitrate radicals is realized, and the effect of water treatment is achieved.

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.

The invention discloses a preparation method of a cobalt-doped titanium dioxide three-dimensional nano flower-shaped hierarchical structure photoelectrode rich in oxygen vacancies and application of the cobalt-doped titanium dioxide three-dimensional nano flower-shaped hierarchical structure photoelectrode in the field of photoelectrocatalysis. The electrode is suitable for innocent treatment of nitrate-containing high-salinity wastewater. According to the preparation method, a cobalt-doped defect-state titanium dioxide photoelectrode is prepared by utilizing a hydrothermal method and a cation exchange method, a three-dimensional nanoflower hierarchical structure is presented, cobalt-oxygen vacancy double active sites are constructed, and low-concentration nitrate can be efficiently and highly selectively removed to nitrogen through photoelectrocatalysis. The method has the prominent characteristics that the method is applicable to a wide pH value range, and the nitrate wastewater has good adaptability and operation stability. The corresponding preparation method is simple to operate, and a reliable and highly feasible solution is provided for solving the problem of nitrate-containing wastewater treatment.

The invention discloses a carbon-deficient wastewater nitrate removal method based on water flow power, and belongs to the technical field of water treatment and environment restoration. According to the method, NO3-containing wastewater flows through a porous medium reactor at a certain flow speed, and contact between water flow and the surface of a filling material is utilized; the method comprises the following steps: by taking NO3 as a raw material, separating and inducing a contact electric effect, generating hydrogen free radicals with strong reducibility in situ, and realizing efficient non-biological reduction by utilizing a chemical reaction of the hydrogen free radicals and NO3 under the condition of not depending on an external carbon source or a chemical reducing agent. The method is mild in reaction condition, can be operated at normal temperature and normal pressure, has the advantages of simplicity and convenience in operation, low cost, no secondary pollution, wide medium source, reusability and the like, and is particularly suitable for NO3 pollution treatment in underground water, agricultural drainage and other carbon source lacking scenes.

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 invention discloses a method for preparing 2, 5-diformyl furan by selectively oxidizing 5-hydroxymethylfurfural, which comprises the following steps of: reacting 5-hydroxymethylfurfural serving as a raw material, air or oxygen serving as an oxidant, nitrate or ferric salt and sodium iodide serving as main active components of a catalyst and DMSO (dimethylsulfoxide) serving as a solvent at the temperature of between 80 and 160 DEG C for a certain time under the condition of normal pressure, and separating a product to obtain the 2, 5-diformyl furan. The ferric salt is ferric nitrate nonahydrate, and the catalyst is 2, 5-diformyl furan. The dosage of the ferric salt is 0 to 0.50 mmol; the use amount of the sodium iodide is 0 to 0.50 mmol. According to the method, DMSO is adopted as a solvent, the used catalyst is cheap and easy to obtain, the yield of 2, 5-diformyl furan can reach 95% at most after the reaction is carried out at 140 DEG C for 20 h, the requirement for equipment is low, and the method is suitable for industrial production.

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).

The invention belongs to the field of intelligent control of sewage treatment, and particularly provides an anoxic tank nitrate optimization control method and system based on dynamic grading of total nitrogen in inlet water, a storage medium and equipment. Calculating a control value of nitrate nitrogen at the tail end of the anoxic tank; calculating the total amount of nitration nitrogen removed by the inlet water carbon source, calculating the total amount of nitration nitrogen needing to be removed by adding the carbon source according to the anaerobic tank-anoxic tank nitration nitrogen load, the total amount of nitration nitrogen removed by the inlet water carbon source and the anoxic tank nitrate nitrogen control value, and calculating the adding amount of the carbon source needing to be added according to the total amount of nitration nitrogen needing to be removed by adding the carbon source; and monitoring the actual nitrate nitrogen concentration at the tail end of the anoxic tank, comparing the actual nitrate nitrogen concentration with the nitrate nitrogen control value at the tail end of the anoxic tank, and adjusting the adding amount of the carbon source. By monitoring inlet water and process parameters in real time, integrating microbial assimilation, dynamically calculating the control threshold value of nitrate in the anoxic tank and then calculating the basic adding amount of the carbon source, it is guaranteed that the total nitrogen in total outlet water stably reaches the standard, and the consumption of the carbon source is reduced.

The invention discloses a sulfur autotrophic denitrification system monitoring and control method and system based on machine learning, and the method comprises the steps: collecting system operation parameter data in real time, inputting the system operation parameter data into a first machine learning model, and predicting the effluent nitrate nitrogen concentration of the system by the model; when the predicted concentration value is higher than a preset emission standard threshold value, an early warning signal is triggered; identifying key influence factors with high effluent nitrate nitrogen concentration value by adopting an SHAP interpretability analysis method, and carrying out quantitative sequencing on influence degrees of the factors; based on the obtained key influence factors and related data, a bimodal load management strategy or a precise chemical dosing strategy is selected and executed, and the effluent nitrate nitrogen concentration of the system is controlled within the emission standard threshold value range. The sulfur autotrophic denitrification system is subjected to monitoring-diagnosis-control closed-loop intelligent management, so that refined and active regulation and control of the sulfur autotrophic denitrification process are realized, and the operation stability, the treatment efficiency and the economical efficiency of the system are improved.

The application discloses a kind of mixed nitrate class molten salt preparation device, it is related to molten salt preparation technical field, including jar body, the jar body is rotatably connected with rotating pipe, rotating pipe is fixedly connected with two fixed rods, further include: mixing mechanism.The application is expanded by the setting of scraping unit, inert gas in gas storage tank is expanded under the action of high temperature, gas expansion drives by rotating pipe into two installation cylinder, and drives two first sliding piston rod to move outward, first sliding piston rod moves and drives fixed frame to move, fixed frame moves and drives movable pipe and scraper to move, so that scraper is contacted with jar body inner wall, and the inner wall of jar body is scraped, movable pipe moves and drives rotating ring to rotate by connecting block, connecting rod and fixed block, rotating ring rotates and drives two baffle one to rotate, so that the area of two feed ports is increased, and then the feeding amount is increased, thereby adaptively increase the turnover amount, improve the uniform heating effect of material.

The preparation method for growing the metal organic framework on the dendritic porous silicon dioxide comprises the following steps: treating the dendritic silicon dioxide by using organosilane and anhydride in sequence to obtain carboxyl-functionalized dendritic porous silicon dioxide. And growing a metal organic framework on the surface of the carboxyl functionalized dendritic porous silicon dioxide by using a metal nitrate solution. The preparation method is simple and controllable, the synthesized dendritic porous dioxide-metal organic framework composite material has large metal organic framework loading capacity, and the metal organic framework material has regular growth morphology on the surface of dendritic silicon dioxide, shows excellent corrosion resistance, and has good application prospects. Good application prospects are realized in the field of intelligent anti-corrosion coatings.

The application discloses a cast iron enamel high-temperature matte glaze without fluorinated salt and nitrate, and a preparation method and application thereof, and belongs to the technical field of enamel. The matte glaze is prepared from quartz, borax pentahydrate, titanium dioxide, sodium carbonate, calcium carbonate, barium carbonate, aluminum oxide, sodium tripolyphosphate, potassium carbonate and lithium carbonate according to specific mass proportions. The preparation comprises raw material mixing, smelting at 1300+ / -10 DEG C under a pure oxygen environment, and rapid cooling after wire drawing detection of the smelting state. The matte glaze completely avoids the use of fluorinated salt and nitrate, eliminates the problems of fluoride emission and environmental protection equipment blockage from the source, and the fluorine content of the product is not detected through detection, thereby meeting the limit value requirements of the EU REACH regulation. Meanwhile, the matte glaze has good enamel surface, excellent firing performance and matte performance, is suitable for a cast iron substrate, has a firing temperature of 780-800 DEG C, and can be used for the production of green and environmentally-friendly enamel products.

The present application relates to the technical field of water treatment, and discloses a composite carbon source for removing nitrate in an aquarium system, a preparation method and application thereof. The components of the composite carbon source include glycerol, slow-release carbon source, zeolite, citrate, vitamin, HEPES and binder. The glycerol and slow-release carbon source in the composite carbon source form synergy, the former can quickly start microbial action and rapidly reduce the concentration of nitrate, and the latter provides long-term support to ensure the sustainability of the degradation effect. The combination not only improves the denitrification efficiency, but also avoids the side effects caused by excessive short-term carbon source. In addition, the glycerol and citrate are synergistic in both chemical and biological aspects: the former is a short-term and rapid energy source, and the latter plays a role in metal buffering and environmental regulation, and both provide good support for efficient denitrification of microorganisms. In combination with the physical and chemical properties of other components, the stability and efficiency of the composite carbon source for denitrification are improved.

The invention relates to the technical field of analytical chemistry detection, in particular to a method for determining trace nitrite in pharmaceutic adjuvants.The method comprises the steps that an acetonitrile solution, a potassium hydroxide solution, a phosphate buffer solution, a sulfuric acid solution, a 2, 3-diaminonaphthalene solution and a reference substance working solution are provided; the method comprises the following steps: preparing a standard curve solution and a test sample solution, and carrying out ultra-high performance liquid chromatography-tandem mass spectrometry analysis detection: respectively carrying out sample injection detection on the test sample solution and the prepared standard curve solutions with different concentrations under preset chromatographic conditions and mass spectrometry conditions, recording detection results of the standard curve solutions with different concentrations to make a standard curve, and calculating the content of nitrite in the test solution by adopting a standard addition method according to the standard curve and the detection result of the test solution. The method disclosed by the invention can be used for rapidly determining trace nitrite in a drug sample, and can be used for determining the trace nitrite in pharmaceutical adjuvants and detecting the nitrite in drugs.

The present invention relates to a metal nitrate hydrate catalyst and a method for preparing 5-hydroxymethylfurfural, using same and, more specifically, may provide: a catalyst which comprises a metal nitrate hydrate and is to prepare 5-hydroxymethylfurfural (HMF) from at least one selected from the group consisting of monosaccharides and disaccharides; and a method for preparing 5-hydroxymethylfurfural (HMF), the method comprising (a) a step of preparing 5-HMF by reaction in the presence of the catalyst from a sugar comprising at least one selected from the group consisting of monosaccharides and disaccharides. The present invention provides high 5-HMF yield and selectivity, biological and process stability, and economic efficiency by using inexpensive monosaccharides and / or disaccharides.

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.

The invention belongs to the technical field of adsorption material preparation, and relates to an anion defect type prussian blue analogue and a preparation method and application thereof in cesium adsorption.The preparation method comprises the steps that imidazole and halogenated alkane are subjected to an alkylation reaction and anion exchange to prepare ionic liquid, and after water is added, an ionic liquid-water mixed solvent is obtained; the method comprises the following steps: respectively dissolving transition metal nitrate and potassium ferrocyanide into an ionic liquid-water mixed solvent, dropwise adding a potassium ferrocyanide solution into a transition metal nitrate solution, and stirring to obtain a mixed solution; and carrying out hydrothermal reaction on the mixed solution, cooling to room temperature, washing the material, and drying to obtain the anion defect type prussian blue analogue. The cesium ion adsorption capacity and the cesium ion cycling stability are improved by precisely regulating and controlling anion defects in the Prussian blue analogue, and the cesium ion adsorption material has good ion interference resistance in a complex water environment and shows excellent adsorption selectivity and a wide application range.

This method comprises: mixing a first solution containing a metal nitrate with a second solution containing lithium hydroxide to precipitate a metal hydroxide; thermally decomposing lithium nitrate produced from the metal nitrate and the lithium hydroxide; and recovering lithium oxide contained in the thermal decomposition product of the lithium nitrate. This method may further comprise converting lithium oxide into lithium hydroxide and reusing the lithium hydroxide.

This invention provides a self-trophic denitrification filter media with anti-scaling function and its preparation method. The filter media uses sulfur, magnesite, and a microporous carrier as its main components, supplemented with soluble salts for continuous pore formation, forming a highly efficient self-trophic denitrification filter media with anti-scaling function. This filter media overcomes the problem of scale formation and reduced efficiency when treating high-concentration nitrate wastewater, which is often caused by conventional methods using calcium carbonate as a neutralizing agent. It also overcomes the problems of slow reaction rates and poor filter media activity caused by the inability of filter media prepared using magnesite or siderite to neutralize the generated acid in a timely manner.