306 results about "Oxidation reduction" patented technology

The invention provides a redox imidazole covalent organic framework material as well as a preparation method and application thereof, belongs to the technical field of material preparation and photocatalytic preparation of hydrogen peroxide, and aims to solve the technical problem of low activity of a current covalent organic framework in preparation of hydrogen peroxide. The preparation method of the imidazole-connected redox type imidazole covalent organic framework material comprises the following steps: respectively reacting a reactant 2, 7-di-tert-butylpyrene-4, 5, 9, 10-tetraketone monomer with 4, 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ' The preparation method comprises the following steps: mixing 4, 4 '-(pyridine-2, 4, 6-triyl) tribenzaldehyde and a tri (4-formylphenyl) amine monomer, adding a solvent and a catalyst, uniformly stirring, and reacting to obtain the redox type imidazole covalent organic framework material after the reaction is finished. The application comprises the following steps: adding the covalent organic framework, oxygen and the sacrificial agent into water, and reacting under the irradiation of visible light. The preparation method is green, environment-friendly, simple and easy to implement, the prepared material has good thermal stability, and efficient visible light photocatalysis preparation of hydrogen peroxide can be achieved; meanwhile, the catalyst can be recycled and has good photocatalytic stability.

The invention provides a carbon emission management monitoring method and device for rice planting in a cold region, and relates to the technical field of carbon emission management monitoring. Vertical three-layer parameters of a soil profile, namely the surface methane concentration, the middle oxidation-reduction potential and the deep organic acid concentration, are collected; the method comprises the following steps: mapping a middle-layer potential into an inhibition coefficient according to a microbial electrochemical principle, further calculating potential uplink electron flux and actual downlink electron sedimentation intensity, identifying an electron transport chain breakage risk through a residual error of the potential uplink electron flux and the actual downlink electron sedimentation intensity, and carrying out nonlinear fusion on the electron transport residual error and environment weights of all layers by adopting a p-norm model. Through the risk amplification coefficient, the superlinear conduction of the local risk to the whole system is realized, the dominant risk layer is accurately positioned based on the comprehensive weight, the differential field management strategy is automatically generated, and finally the closed-loop intelligent management normal form is constructed, and the accurate control of the carbon emission based on the mechanism model is realized.

The invention relates to the technical field of AI cluster servers, in particular to a low-temperature running AI cluster server and a using method thereof.The method comprises the following steps that S1, the AI cluster server running at the low temperature through a cold plate is obtained, the cold plate is internally provided with a multi-parameter sensor unit for detecting temperature T, pH value, conductivity EC, suspended particle concentration SC and oxidation reduction potential ORP data influencing the performance of the cooling liquid; s2, carrying out noise removal and abnormal value processing on the obtained data of the temperature T, the pH value, the conductivity EC, the suspended particle concentration SC and the oxidation reduction potential ORP; s3, dividing the data set preprocessed in the step 2 into a training set and a test set, and constructing an LSTM model.According to the method, the health state of the cooling liquid in the AI cluster server running at the low temperature can be accurately and timely monitored and predicted, the time node of liquid cooling replacement can be accurately judged to the maximum extent, and the accuracy of liquid cooling replacement is improved. The stable operation of the server is further ensured; and the maintenance cost and risk are reduced.

The invention discloses a KTP type sodium-rich phosphate positive electrode material and a preparation method and application thereof, the chemical formula of the phosphate positive electrode material is NaxV1-yTyPO4F1-zOz, 1 < x < = 2, 0 < y < = 1, and 0 < = z < = 1; the preparation method of the material comprises the following steps: adding a vanadium source, a T source, a phosphorus source and a fluorine source in a stoichiometric ratio into a reaction kettle containing a reaction solvent, adding an ammonium source to keep the pH value to be 6-10, maintaining the temperature to be 120-250 DEG C, and reacting for 2-24 hours; naturally cooling, and washing with clear water to obtain a (NH4) xV < 1-y > TyPO4F < 1-z > Oz precursor; the preparation method comprises the following steps: fully grinding an excessive sodium source and a (NH4) xV < 1-y > TyPO4F < 1-z > Oz precursor, carrying out Na < + > / NH4 < + > molten salt exchange in a tubular furnace at 60-400 DEG C for 1-48 hours, introducing inert gas during reaction, and washing an obtained product with a washing solvent after the reaction is finished to remove the excessive sodium source; and drying in a drying oven at 50-250 DEG C for 1-30 hours to obtain the KTP type sodium-rich phosphate positive electrode material. By utilizing the induction effect of KTP configuration on V-O or T-O bonds, the voltage of V and T transition metal related redox couple is increased, and the energy density is improved.

The invention discloses a method for preparing a g-C3N4 loaded Fe and Mn bimetallic catalyst with high efficiency and low cost, and belongs to the technical field of catalysts. Manganese ferrite is adopted as a bimetal source, a melamine one-step calcination method is combined, synthesis of g-C3N4 and loading of Fe and Mn are synchronously achieved, manganese ferrite is decomposed into FeOx and MnOx nanoparticles in the calcination process, the FeOx and MnOx nanoparticles and nitrogen sites of g-C3N4 form strong coordinate bonds, metal atomic-scale dispersion can be achieved, and metal ion migration is inhibited; through the bimetallic synergistic effect of Fe and Mn, the oxidation-reduction capacity of the catalyst can be remarkably improved; through the unique thermal decomposition characteristic, the bimetallic synergistic effect and the strong chemical bonding of the manganese ferrite and g-C3N4, the efficient exposure of active sites, the remarkable improvement of the oxidation reduction capacity and the effective inhibition of metal dissolution are realized, and the preparation method also has the advantages of high efficiency, low cost and small secondary pollution risk.

The invention provides an MXene-derived bimetallic composite material as well as a preparation method and application thereof, and relates to the technical field of catalysts. In the MXene-derived bimetallic composite material provided by the invention, a 3D ordered pore structure provides a channel for organic pollutant molecules and H2O2 to transfer mass to a catalytic active center in the material; tiO2 and the MCuFe-MOF generate photo-induced electrons, a TiO2 / Ti3C2Tx Schottky junction and a MCuFe-MOF / Ti3C2Tx Schottky junction promote separation and transfer of charges, and Fe < 3 + > / Fe < 2 + > circulation is accelerated; the synergistic effect of a redox pair between iron and copper in the MCuFe-MOF is shown as a copper-iron bimetal oxide or a copper-iron bimetal organic framework and the like, interface electron transfer can be accelerated, rapid reduction of Fe < 3 + > and Cu < 2 + > is promoted, the Fenton reaction efficiency is improved, and the photo-Fenton catalytic activity is excellent.

The invention provides a method, a system, equipment and a medium for predicting an end point of an oxidation-reduction period of an anode furnace, and belongs to the technical field of computer vision. The method comprises the following steps: acquiring sample images on the front and back surfaces of an anode copper observation sample, and recording relative acquisition time and time from the sample to an end point; labeling the sample image according to the acquisition relative time and the time from the sample to the end point, and generating to-be-detected image data; and inputting the to-be-detected image data into a pre-trained end point judgment model, outputting the classification of the oxidation or reduction stage, the time from the oxidation end point and the time from the reduction end point by using the end point judgment model, integrating the output data, and predicting the final time from the end point. According to the method, the visual features of the anode copper sample are captured through the image recognition technology, the time from the sample to the end point is analyzed and determined in combination with time data, the end point is predicted through the pre-trained deep learning model, and accurate prediction of the oxidation-reduction period end point of the anode furnace is achieved.

The invention provides a digital production supervision method and system, belongs to the field of computers, and aims to solve the problems of high rework rate and low efficiency caused by the fact that optical inspection or chemical analysis often depends on cleaned quartz pieces due to incomplete cleaning of cracks and residual metal and the like and the optimal correction opportunity is missed once the problems are found. The method comprises the steps that in the stage of cleaning a hot-worked quartz workpiece, a cleaning formula is automatically matched based on information of the quartz workpiece, and the cleaning formula comprises a cleaning solution ratio and a cleaning time-temperature control curve; state change parameters of cleaning liquid in the cleaning tank are obtained in real time, wherein the state parameters of the cleaning liquid comprise conductivity and oxidation-reduction potential; and evaluating the quality defect of the quartz workpiece based on the state change parameter of the cleaning fluid.

The invention discloses a method for preparing a sodium electric precursor by a redox control potential method. According to the invention, the oxidation-reduction electrode is arranged on the reaction kettle to monitor the oxidation-reduction potential of the reaction system in real time, and different potential control is realized by controlling the purity of nitrogen and other mixed gases in the reaction kettle or the dosage of an oxidation-reduction agent added into the reaction kettle; the primary and secondary particle morphology, the specific surface area and the product compaction of the product can be effectively controlled, and precursors with different physical and chemical indexes can be prepared according to different potentials. According to different characteristics of the precursor, the sintered positive electrode material has different electrochemical properties, such as higher electrochemical rate capability, gram volume and cycle performance, so as to meet application requirements of different products.

The invention provides a chromium-titanium bimetallic layered sulfide positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The chemical general formula of the material is LiCrxTiyS2, x + y = 1, the material belongs to a hexagonal crystal system O1 type structure, and the space group is Pm1. Microtopography analysis shows that the material is granular, the particle size distribution is 2-15 [mu] m, the particle surface has a layered structure characteristic, and each element is uniformly distributed on the particle surface and in a bulk phase. The capacity of the material mainly comes from oxidation reduction between titanium and sulfur, and chromium has the effect of stabilizing a structural framework and does not participate in the charge compensation process. Electrochemical analysis shows that the reversible capacity of the LiCr2 / 3Ti1 / 3S2 positive electrode material reaches up to 223 mAh g <-1 > and is close to the theoretical value of the positive electrode material of the system. In addition, the material shows excellent rate capability and cycling stability, and still keeps the capacity retention ratio of 80% after 330 times of cycling.

The invention relates to a corrosive agent and a corrosion method for displaying a 32CrNi3MoVE crystal boundary of alloy steel, which are characterized in that a common chemical product is used as an electrolytic corrosive agent after being simply proportioned, and the 32CrNi3MoVE steel quenched and tempered state original austenite crystal boundary is clearly displayed by a proper corrosion method. Chemical reagents used by the corrosive are economical and applicable, the corrosive is composed of alum, oxalic acid, dishwashing liquid, distilled water and the like which are existing in a laboratory, the proportioning of the corrosive is the key, the electrolytic corrosion method is simple to operate, alum can effectively display the grain boundary, oxalic acid provides a weak acid environment for oxidation reduction, and the corrosion effect is good. The dishwashing liquid slows down the corrosion rate of weak acid electrolyte to a metallographic specimen, weakens structure display, and improves the definition of crystal boundary display. The corroded sample is lightly polished in a polishing machine, and the corrosive agent ratio and the electrolytic corrosion method are combined to form an efficient novel corrosion method. The traditional corrosive agent capable of completely replacing saturated picric acid and a proper amount of detergent and the corrosion method effectively solve the problem of 32CrNi 3MoVE steel quenched and tempered state original austenite grain boundary display.

The invention discloses an IEF-11 / WO3-xS type heterojunction material with full spectrum response as well as a preparation method and application of the IEF-11 / WO3-xS type heterojunction material. The heterojunction is prepared by taking squaric acid, tetrabutyl titanate and WO3-x particles as raw materials, wherein the value range of x in WO3-x is 0 < = xlt; 1. The heterojunction material creatively realizes full-spectrum response from ultraviolet to near infrared through S-type energy band structural design, the separation efficiency of photo-induced electron-hole pairs reaches 2.47 times (compared with WO3-x) and 1.57 times (compared with IEF-11) due to a unique carrier transport mechanism, and strong redox sites are synchronously reserved, so that the material can be applied to the field of photoelectron-hole separation. And compared with a single-component material, the photocatalytic performance is improved by 3.74 times (compared with WO3-x) and 1.41 times (compared with IEF-11). Experiments show that under full-spectrum irradiation, the inactivation rate of the material to escherichia coli can reach 99%, the 120-minute degradation rate of the material to tetracycline (TC) reaches 86%, the material shows broad-spectrum degradation capacity to typical organic pollutants such as chlortetracycline (CTC), rhodamine B (RhB) and methylene blue (MB) in a visible region, and the 120-minute degradation efficiency reaches 77%, 53% and 95% respectively. The heterojunction material is prepared through a simple hydrothermal method, and has important application value in the fields of environmental governance, photocatalytic disinfection and the like.

The invention provides a preparation method of an oxygen-defect-enriched copper-doped manganese dioxide catalyst, which is characterized in that potassium permanganate and copper nitrate are used as precursors, oxalic acid is used as a reducing agent, and an oxygen-defect-enriched copper-doped manganese dioxide material is synthesized through a redox coprecipitation method. A series of characterization proves that the composite material is successfully synthesized and shows excellent low-temperature activity of catalytic oxidative degradation of toluene due to the fact that the specific surface area of the catalyst is increased due to the coralline porous form of the composite material, and more reaction active sites are provided by the synergistic effect of oxygen deficiency and copper species. The catalyst has excellent performance in 12-hour stability and water vapor resistance tests, and has the advantages of stability, high efficiency and the like.

The invention discloses a preparation method and application of a MnCeNbTiOx catalyst for degrading NO by NH3-SCR (selective catalytic reduction), particularly relates to a catalyst for effectively degrading an atmospheric pollutant NO, and belongs to the field of atmospheric pollution treatment and environment-friendly catalytic environment. The catalyst is prepared by using Mn as a main active component, Ti as a carrier and transition metals Ce and Nb as auxiliaries through a coprecipitation method. The preparation method comprises the following steps: firstly, weighing an active component Mn (NO3) 2.4 H2O, an auxiliary agent Ce (NO3) 4.6 H2O and an auxiliary agent C10H5NbO20 according to a stoichiometric ratio, adding a proper amount of deionized water to completely dissolve, then adding a metered Ti (SO4) 2 carrier, stirring until the Ti (SO4) 2 carrier is completely dissolved, dropwise adding ammonia water under the condition of stirring to adjust the pH value to be approximately equal to 10, then stirring the obtained solution for 1 hour, aging for 1 hour, transferring into a centrifugal tube, centrifuging, washing to be neutral, and drying to obtain the catalyst. And placing the obtained catalyst sample in an oven at 110 DEG C for overnight drying, then taking out the dried catalyst sample, grinding the dried catalyst sample into powder, placing the powder in a muffle furnace, roasting the powder at 500 DEG C for 5 h, and naturally cooling the powder to obtain the MnCeNbTiOx catalyst. The MnCeNbTiOx catalyst disclosed by the invention has better low-temperature activity and a wider operating temperature window, can effectively remove NO in the tail gas of the industrial furnace, achieves the highest NO conversion rate of 98% at the temperature of 250 DEG C, and has a T80 operating temperature window of 175-435 DEG C. Meanwhile, characterization results show that after the auxiliaries Ce and Nb are added, the catalyst mainly presents an amorphous structure, the oxidation-reduction performance of the catalyst and the interaction force among the components are enhanced, and improvement of the denitration activity of the catalyst is facilitated.

The invention relates to the technical field of preparation of a sodium ion battery positive electrode material, in particular to a method for activating oxidation reduction of layered oxide oxygen ions by adopting ZrO2 coating and adopts a resonance mode of gradient rotation and revolution (gradient rotation resonance) to enable a very small amount of ZrO2 to be uniformly dispersed in layered oxide particles. Therefore, ZrO2 is uniformly coated on the surface of the layered oxide; the synergistic effect of ZrO2 coating and Zr < 4 + > doping can catalyze the oxidation-reduction reaction of oxygen ions of the layered oxide within the voltage range of 2-4 V, the dissolution of the oxygen ions is inhibited while the extra discharge gram specific capacity is provided, and the interface stability of the material is improved.

The invention provides a high-fidelity sampling method for keeping an oxidation-reduction state of a soil in-situ stratum, which comprises the following steps: step 10, drilling to a depth position of an underground water burial depth, and forming a preformed hole above the water level of the underground water; 20, the protective sleeve is installed in the preformed hole, and inert gas is introduced into the protective sleeve till an inner cavity of the protective sleeve is filled with the inert gas; and step 30, a high-fidelity sampling drilling tool is adopted to penetrate through the protective sleeve to perform downward collection to obtain a soil sample within a preset depth range below the water level of the underground water. According to the high-fidelity sampling method for keeping the oxidation-reduction state of the soil in-situ stratum, high-fidelity collection of soil samples below the water level of underground water can be achieved, and the oxidation-reduction potential of the soil in-situ stratum is kept.

The invention discloses a method for preparing 5N selenium powder, which specifically comprises the following steps: carrying out oxidation treatment on a crude selenium raw material to be treated to obtain selenium dioxide; dissolving the obtained selenium dioxide at normal temperature to obtain a seleninic acid solution; and carrying out cascade reduction reaction on the obtained seleninic acid solution under the action of an external magnetic field to obtain nano-scale selenium powder, and washing and drying the nano-scale selenium powder to obtain the 5N selenium powder. According to the method, the oxidation-reduction potential is controlled to rise in a stepped manner, and the external magnetic field is used for assistance, so that the oxidation-reduction reaction of selenium is adjusted, forward proceeding of the selenium reduction reaction is promoted, the whole preparation process is short, the selenium purity is high, and the direct yield of selenium is high.

The invention discloses a mechanical and photochemical fluid polishing integrated auxiliary machining platform and a combined polishing method. The platform comprises a rack, a workpiece transfer mechanism used for clamping and moving a workpiece, a mechanical fluid polishing module and a photocatalysis detection feedback module. The mechanical fluid polishing module comprises a dual-purpose polishing groove body, a mechanical polishing assembly and a photocatalytic fluid polishing assembly. The shading area is arranged in the photocatalytic fluid polishing chamber, the oxidation-reduction potentials inside and outside the shading area are detected respectively, the optical excitation ORP value is obtained by solving the difference, the optical excitation ORP value is maintained in an ideal interval by adjusting the ultraviolet light intensity, and the whole photocatalytic fluid polishing process is kept efficient and reliable; due to the fact that the optical excitation ORP eliminates the influence on the oxidability of original substances which contribute slightly to workpiece surface oxidation in the polishing solution, the increment of hydroxyl free radicals generated due to photocatalysis can be accurately measured, and the control accuracy of the photocatalytic fluid polishing process is improved.

The application discloses an automatic control method for oxidation flocculation parameters in mancozeb wastewater treatment, and belongs to the technical field of industrial wastewater treatment and automatic control. In view of the problem that the existing process relies on manual experience and the oxidation and flocculation stages are improperly connected, the multifunctional modified material containing dithiocarbamate salt groups, quinone groups and pre-complexed manganese and zinc ions is prepared first; the material and hydrogen peroxide are synchronously added in the acid oxidation stage, and the control system monitors the redox potential change rate in real time; when the redox potential reaches the preset threshold value and the characteristic change point with the first derivative of zero or the change from positive to negative appears and is maintained for the preset maintenance time, the system is automatically adjusted to be alkaline, the modified material triggers the net capture and chelation crosslinking reaction, and finally solid-liquid separation is carried out; the polymer skeleton is protected from indiscriminate attack of free radicals, the problem of drug antagonism is overcome, and the stable and up-to-standard effluent quality is realized.

The application relates to a catalyst for catalytically synthesizing propylene acid from propane and application thereof, and the catalyst is represented by the following general formula: Mo a V b Te c Nb d Ni e O x Wherein, a, b, c, d and e respectively represent the atom numbers of Mo, V, Te, Nb and Ni, and the molar ratio of a:b:c:d:e is 7.0-9.0:1.7-2.5:1.0-1.5:1.7-2.3:0.1-1.0, and the value of x is determined by the oxidation state of each element; Ni is introduced by nickel molybdate, Mo is introduced by a molybdate and the nickel molybdate, and the nickel molybdate is prepared by co-precipitation of a molybdate and a nickel salt in the presence of an organic acid. According to the application, the content of different valence metals on the surface of the catalyst can be adjusted by introducing nickel into the catalyst through nickel molybdate, so that the content of high-valence elements Mo 6+ , V 5+ and Ni 2+ in the catalyst and the oxygen vacancy are increased, and the redox capacity of the catalyst is enhanced.

The invention discloses a monatomic iron anchored covalent triazine skeleton and a green synthesis method and application thereof, and the method specifically comprises the following steps: in an air atmosphere, mixing 1, 4-terephthalaldehyde, p-phenylenediamine hydrochloride and a basic catalyst, dissolving in a solvent, and carrying out gradient heating at 60-120 DEG C for condensation reaction; when the reaction temperature is 120 DEG C, an iron source is added, the reaction temperature is maintained for continuous reaction to obtain the monatomic iron anchored covalent triazine skeleton Fe-CTFs, and the prepared Fe-CTFs has good application in catalytic degradation of pollutants. According to the preparation method, a gradient heating method is adopted, abundant N coordination sites can be subjected to coordination reaction with metal iron ions under a high-temperature condition, a more stable Fe-Nx coordination structure is formed, and thus the stability of the catalyst is enhanced. Monatomic iron endows Fe-CTFs with more reaction active sites and more excellent oxidation-reduction performance, and has a wide application prospect.

The present invention discloses a multifunctional ionic porous organic cage material, its preparation method and chromium adsorption application, belonging to the technical field of porous organic materials. In the present invention, a porous organic cage material NKPOC-PH is synthesized using tetraaldehyde m-cyclocucurbit[4]arene and pyridine-3,5-dicarboxylic dihydrazide as reaction monomers, and then it is modified with methyl iodide to obtain ionic NKPOC-PH(I)Me. The present invention uses an easily modified porous organic cage as the substrate to construct triple synergistic adsorption sites of redox, coordination and electrostatics. Pyridine groups in the material are used as the introduction points of electrostatic sites, hydrazide linking groups as redox sites, and nitrogen-rich sites to adsorb dichromate ions through coordination. The obtained ionic porous cage can achieve an ultra-high chromium adsorption performance with a saturated adsorption capacity exceeding 1.3 g / g under acidic (pH = 3-4) aqueous phase conditions. The ionic porous organic cage material described in the present invention provides a new solution for adsorbing dichromate ions under aqueous phase conditions.

The application provides a reduced graphene oxide powder, which is obtained through carbonization after twice oxidation-reduction processes. After one-time low-degree oxidation-reduction and secondary high-degree oxidation, large-diameter graphene is inserted deeper in the oxidation process, and the oxidation is more sufficient, so that the reduced graphene oxide with low powder resistivity and high specific surface area is obtained.

The present invention provides a kind of dilute solution manufacturing device, trace addition to the first liquid such as ultrapure water, the second liquid containing conductivity imparting substance or oxidation-reduction potential adjustment substance, can stably manufacture the dilute solution of specified concentration. Dilute solution manufacturing device by adding the second liquid containing at least one of conductivity imparting substance and oxidation-reduction potential adjustment substance to the first liquid to manufacture the dilute solution of the second liquid, wherein, with: first pipe (1), flow through the first liquid;Pump (6), via second pipe (5) to the first pipe (1) inside the second liquid is added;Degassing pipe (8), from the pump (6) degassing;Water quality sensor (11), by conductivity meter, resistivity meter or oxidation-reduction potential meter is constituted;And control device (12), when the water quality detection value of the water quality sensor (11) is above the specified value, open degassing valve (9).

The invention discloses a high-uniformity PCB pattern electroplating method based on pulse electroplating, and aims to solve the problem of insufficient copper thickness uniformity caused by residual copper rate difference, unreasonable process edge design, poor accompanying plating plate adaptability and direct current electroplating defects in traditional pattern electroplating. A plating block is arranged on the process edge of a PCB to share current, a special accompanying plating plate matched with the residual copper rate is configured to optimize an electric field, an electroplating solution containing Fe < 2 + > / Fe < 3 + > redox electron pairs and an insoluble titanium mesh anode are adopted, the two-step pulse electroplating process is combined, and the additive ratio and electroplating environment parameters are regulated and controlled, so that uniform deposition of a copper layer is achieved. The method effectively solves the problems that the local copper layer is too thick / too thin, and filling defects exist in the hole, and improves the reliability and signal transmission performance of the PCB coating.

This invention relates to a rare earth denitrification catalyst, its preparation method, and its application. The rare earth denitrification catalyst comprises rare earth element single atoms and a titanium dioxide-based composite oxide doped with rare earth single atoms. The rare earth element single atoms in this invention exhibit a high adsorption priority for sulfur dioxide, allowing the position and quantity of sulfate to be controlled by the rare earth element single atoms. Furthermore, the hydroxyl groups in the sulfate can enhance the acidity of the catalyst, thereby further improving its redox capacity. The titanium dioxide-based composite oxide can effectively inhibit sulfur dioxide poisoning and further improve the catalyst's denitrification ability in the presence of sulfur dioxide. The rare earth denitrification catalyst of this invention maintains high catalytic activity even in the presence of sulfur dioxide, exhibiting excellent denitrification and sulfur resistance performance.

The invention belongs to the technical field of synthesis of functional crystalline compounds, and discloses a rare earth-polyacid-based compound as well as a preparation method and application thereof. The chemical formula of the rare earth-polyoxometalate compound is [Dy (DMF) 8] [PMo12O40], and the cell parameter is # imgabs0 #. The preparation method comprises the following steps: sequentially adding an H3 [PMo12O40] solution as a lower solution, an organic solvent as a middle buffer layer solution and a mixed solution of Dy (NO3) 3.6 H2O and 4-hydroxyazobenzene-2-carboxylic acid as an upper solution C into a container, keeping a layered state, standing until crystal particles appear on the middle layer of the container, and drying to obtain the rare earth-polyoxometalate compound. The crystal particles are the rare earth-polyacid group compound. The material has excellent electro-catalysis characteristics and can be applied to detection and oxidation reduction of nitrite.

The present invention discloses a preparation method and application of doped Gd rutile-type ruthenium dioxide nanosheets. In the present invention, by using RuCl3 and GdN3O9 as raw materials, doped Gd rutile-type ruthenium dioxide nanosheets are successfully prepared by the salt template method. When used as an oxygen evolution catalyst for hydrogen production by electrolyzing water, it exhibits excellent oxygen evolution performance (OER). At a current density of 10 mA cm-2, an overpotential of only 230 mV is achieved, and at the same time, it has excellent conductivity, a wide potential window, and high redox reversibility. Therefore, it has broad application prospects in the field of electrocatalysis. In addition, the preparation method of the present invention has the characteristics of simple, safe and easy-to-control process steps, easy availability of raw materials, less use of chemical reagents in the whole preparation process, small environmental pollution, mild experimental conditions, short time consumption, and low cost. Therefore, it is suitable for industrial promotion and application.

This invention discloses a method for assessing the oxidation state of specialty berry wines based on dissolved oxygen and oxidation-reduction potential (ORP). Using berry wines aged for 8 months with dissolved oxygen levels less than 0.2 mg / L and ORP less than -50 mV as a benchmark, wine samples with different initial dissolved oxygen gradients were prepared and accelerated to 4 weeks at 40°C. Dissolved oxygen, ORP, anthocyanin retention rate, total phenolic retention rate, ΔE, and sensory scores were simultaneously measured. A dissolved oxygen-ORP linear regression model was established, and piecewise linear regression was used to identify two key inflection points. Based on this, the oxidation state was classified into five levels: safe reducing state, transitional state, slightly oxidized state, moderately oxidized state, and heavily oxidized state. Quality index ranges and production recommendations for each level were provided. After 12 months of bottle storage validation, the model's prediction accuracy reached 92.5%. This invention can rapidly assess the oxidation state of specialty berry wines and guide precise oxygen control.

The invention discloses a dephosphorization material and a preparation method and application thereof, the dephosphorization material comprises: a base material, the base material comprises SiO2, Al2O3, Fe2O3, CaO and MgO; elemental iron; and a plant foaming agent. The large-aperture structures uniformly distributed inside and outside the phosphorus removal material are beneficial to growth and attachment of microorganisms, and generation sites are provided for the removal process of phosphoric acid. The elemental iron contained in the material and phosphate undergo valence change through chemical combination to form hydroxyl and phosphorus flocculation so as to efficiently remove phosphorus pollution. In addition, due to the characteristics of oxidation-reduction capability, low cost, high porosity, difficulty in bonding, large specific surface area, high active iron content and the like of iron, the material has stronger electrochemical enrichment, physical adsorption and oxidation-reduction properties. Therefore, the traditional bottleneck is solved, and excellent efficiency is achieved in a biological filter and an artificial wetland.