34 results about "Strontium oxide" patented technology

The present invention developed a composite having a novel structure containing, in a high content, a powder having a radiation-shielding function.　Provided is a composite having a radiation-shielding function and a method for producing the same. The composite comprises a preform made from a mixture containing a liquid silica-based binder and one or more radiation-shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder, the radiation-shielding powder(s) being contained in the range from 3% to 85% in total. All of the voids in the preform are impregnated and filled with molten aluminum and solidification is allowed to occur to form a composite, or 25% or more of the voids in the preform are impregnated with a liquid organic / inorganic sealing agent and solidification is allowed to occur to form a composite. The liquid silica-based binder has properties that allow the preform to be formed at a temperature at which the radiation-shielding powder(s) does not decompose.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

This invention discloses a radiation-resistant glass, its preparation method, and its application. The radiation-resistant glass comprises the following components in weight percentage: silicon dioxide 60%-70%; sodium oxide 13%-18%; zinc oxide 3%-6%; aluminum oxide 2%-6%; boron trioxide 1%-6%; strontium oxide 1%-3%; cerium dioxide 4.7%-5.5%; lanthanum trioxide / hafnium dioxide 1%-3%; and ammonium difluoride 0.3%-1%. The technical problem to be solved is to significantly improve the high-energy particle radiation protection and light transmittance of the glass by selecting a specific formulation.

To develop a composite of a new constitution containing a powder having a radiation shielding function in a high content.SOLUTION: Molten aluminum is impregnated and filled into all voids of a preform made of a mixture containing one or more kinds of radiation shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder and a liquid silica-based binder, the mixture containing the radiation shielding powders in a range of 3 to 85% in total; In the composite body having the radiation shielding function and the method for manufacturing the same, a liquid organic-inorganic sealing agent is impregnated and solidified to form the composite body, and a liquid silica-based binder has characteristics capable of forming a preform at a temperature at which the radiation shielding powder is not decomposed.SELECTED DRAWING: None

The invention belongs to the technical field of ceramic lining plate preparation, and particularly relates to a wear-resistant ceramic lining plate and a preparation method thereof. The wear-resistant ceramic lining plate is prepared from the following raw materials: aluminum oxide, a sintering aid, aluminum titanate, modified urea resin microspheres, hafnium boride, tungsten disilicide and a KH-550 silane coupling agent, and the sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide. According to the wear-resistant ceramic lining plate, aluminum oxide serves as a main raw material, a mixture of niobium pentoxide, strontium oxide, lanthanum oxide and magnesium oxide serves as a sintering aid, a compound of modified urea-formaldehyde resin microspheres, hafnium boride and tungsten disilicide serves as a reinforcing and toughening phase, aluminum titanate serves as a conditioning agent, and the raw materials have a synergistic effect; and it is ensured that the prepared ceramic lining plate has good wear resistance, hardness and toughness.

The present disclosure provides a novel positive electrode active material for a chloride ion battery, a method for manufacturing the same, a positive electrode mixture for a chloride ion battery comprising such a positive electrode active material, and a chloride ion battery comprising such a positive electrode mixture. The positive electrode active material for a chloride ion battery according to the present disclosure is strontium ruthenium oxide having a layered perovskite structure. A method for producing a positive electrode active material for a chloride ion battery according to the present disclosure comprises the steps of: (a) preparing a raw material mixture by mixing strontium carbonate and ruthenium oxide; (b) granulating the raw material mixture to form granules; and (c) firing the particles. The positive electrode mixture for a chloride ion battery according to the present disclosure contains the positive electrode active material for a chloride ion battery according to the present disclosure. The chloride ion battery of the present disclosure has a positive electrode active material layer, and the positive electrode active material layer contains the positive electrode mixture for the chloride ion battery of the present disclosure.

We provide phosphate glass with a high refractive index and low density. [Solution] The glass composition contains phosphorus oxide (P2O5), niobia (Nb2O5), barium oxide (BaO), and potassium oxide (K2O) as essential components, and may optionally contain titania (TiO2), calcium oxide (CaO), sodium oxide (Na2O), lithium oxide (Li2O), bismuth oxide (Bi2O3), strontium oxide (SrO), tungsten oxide (WO3), and other components, with the total of TiO2 + Nb2O5 being 1.0 mol% or more and 55.0 mol% or less. The glass can be characterized by a high refractive index at 587.56 nm at relatively low density at room temperature.

The glass composition includes phosphorus oxide (P2O5), niobium oxide (Nb2O5), barium oxide (BaO), and potassium oxide (K2O) as essential components, and can optionally include titanium oxide (TiO2), calcium oxide (CaO), sodium oxide (Na2O), lithium oxide (Li2O), bismuth oxide (Bi2O3), strontium oxide (SrO), tungsten oxide (WO3), and other components. The glass can be characterized as having a high refractive index at 587.56 nm with a comparable room temperature low density.

The use of selective deposition of silicon nitride can eliminate conventional patterning steps by allowing silicon nitride to be deposited only in selected and desired areas. Using a silicon iodide precursor alternately with a thermal nitrogen source in an ALD or pulsed CVD mode, silicon nitride can be deposited preferentially on a surface such as silicon nitride, silicon dioxide, germanium oxide, SiCO, SiOF, silicon carbide, silicon oxynitride, and low k substrates, while exhibiting very little deposition on exposed surfaces such as titanium nitride, tantalum nitride, aluminum nitride, hafnium oxide, zirconium oxide, aluminum oxide, titanium oxide, tantalum oxide, niobium oxide, lanthanum oxide, yttrium oxide, magnesium oxide, calcium oxide, and strontium oxide.

The application discloses a kind of photothermal glass and preparation method thereof, it is related to photothermal glass technical field, including main body glass and trace additive;Main body glass includes the following components according to mass percentage:Si O2 58.8~63.4%;A l2O3 12.4~14.6%;Na2O 9.8~13.6%;K2O 4.6~6.8%;MgO 5.6~7.4%;ZrO2 0.6~1.2%;B2O3 0~0.3%;And Fe2O3<0.01%;Trace additive is one or more in CaO, SrO, BaO, ZnO.The trace additive (calcium oxide, barium oxide, strontium oxide, zinc oxide) in the application can also promote the melting of glass raw materials.The photothermal glass prepared by the application has a thermal stability greater than 210℃, an acid resistance level of H1, and an alkali resistance level of A1.

The invention relates to the technical field of magnesium alloy surface treatment, in particular to strontium salt and calcium salt composite chemical conversion liquid for magnesium alloy, a preparation method and a preparation method of a conversion film. The method comprises the following steps: firstly, preparing a saturated calcium bicarbonate solution and a saturated strontium hydroxide solution; sequentially adding a saturated strontium hydroxide solution and hydrogen peroxide into water to obtain a strontium hydroxide preparation solution; preparing a sodium bicarbonate solution; mixing the saturated calcium bicarbonate solution, the strontium hydroxide preparation solution and the sodium bicarbonate solution to obtain a strontium salt and calcium salt composite chemical conversion solution; and the magnesium alloy part to be treated is placed in the strontium salt and calcium salt composite chemical conversion liquid, and after no bubble emerges, the magnesium alloy part subjected to surface treatment is taken out, washed with water and blow-dried. The method is low in cost, low in energy consumption and environmentally friendly, and the prepared composite conversion film composed of SrCO3, CaCO3, MgCO3, MgO, Al2O3 and other phases is uniform, fine, smooth and flat and has excellent corrosion resistance.

This application discloses a method for producing acetonitrile, comprising the following steps: in a reactor, contacting an acetate, ammonia, and a catalyst to react and obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; wherein the catalyst is composed of a support and a divalent transition metal oxide, an alkaline earth metal oxide, and an alkali metal oxide supported on the surface of the support; wherein the divalent transition metal oxide is selected from at least one of manganese oxide, ferrous oxide, cobalt oxide, nickel oxide, copper oxide, and zinc oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; and wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide.

The application discloses a glass frit for a single-crystal silicon solar cell front paste, a paste, and a single-crystal silicon solar cell. The glass frit comprises 1-30 mol% of lithium oxide, 5-40 mol% of bismuth oxide, 5-40 mol% of lead oxide, 1-40 mol% of silicon oxide, and X, wherein X is any one or a mixture of several of copper oxide, cesium oxide, rubidium oxide, sodium oxide, potassium oxide, aluminum oxide, magnesium oxide, strontium oxide, tin oxide, zinc oxide, or tungsten oxide, and the molar content of any one of the oxides in X is 1-10 mol%, and the content of X is not more than 50 mol%. The conductive paste prepared by using the glass frit contains a lead-bismuth-silicon oxide glass system, the system has enhanced resistance to acetic acid attenuation, ensures a sintering window at a high-temperature fast-firing sintering temperature, and X has strong corrosiveness, so that a lower contact area can be obtained. The conductive paste has high resistance to acetic acid in a wide sintering window.

The application discloses a strontium hydroxide precipitation high-temperature calcining device, which comprises a mounting frame, a furnace cylinder horizontally arranged on the mounting frame, feed inlets and discharge outlets arranged on the two sides of the furnace cylinder respectively, an air feed frame vertically arranged on one side of the upper end surface of the mounting frame, one end of the air feed frame fixed to the furnace cylinder, a guide chute arranged on the air feed frame and communicated with the feed inlet of the furnace cylinder, a combustion machine installed on the upper end surface of the furnace cylinder, a heat exhaust pipe vertically connected to one side of the furnace cylinder away from the combustion machine, a material rotating control assembly arranged in the furnace cylinder with the same center, a material storage seat connected to the discharge outlet of the furnace cylinder through an adjusting pipe, a material box arranged on one side of the mounting frame, one end of the material storage seat communicated with the material box, a switching pipe communicated with the material box, one end of the switching pipe communicated with the combustion machine through a heat recovery pipe.

This invention relates to a high-intensity mixing ball milling device for pre-calcined permanent magnet ferrite materials, belonging to the field of powder mixing technology. It includes a base, support frame, ball mill cylinder, and cover. The ball mill cylinder is equipped with a partition plate driven by an adjustment component, allowing adjustment of the volume of each grinding zone according to the material quantity. The cylinder also contains multiple sets of actuating components monitored by cameras. These actuating components can move along a moving rod, and their ends are equipped with an arc-shaped push plate and a fixed ring with a flat groove connected to a micro air pump. During operation, the partition plate position is first adjusted to match the grinding space with the material quantity. During grinding, the camera monitors the distribution and agglomeration of the steel balls and controls the movement of the actuating components. The arc-shaped push plate disperses the accumulated steel balls, or the directional air jet from the fixed ring breaks up agglomerates of materials such as strontium oxide. This achieves adaptive grinding space, active adjustment of steel ball distribution, and online agglomeration breaking, effectively solving the problems of uneven grinding and insufficient mixing caused by changes in material quantity and powder agglomeration.

The application provides a kind of high-strength high flatness glass substrate for chip packaging and a preparation method thereof, relating to the technical field of chip packaging glass, the raw material composition of the glass substrate includes silicon dioxide, aluminum oxide, boron oxide, magnesium oxide, calcium oxide, yttrium oxide, composite clarifying agent, reinforcing agent, surface modifier, thermal stabilizer;The composite clarifying agent is a mixture of sodium sulfate and antimony dioxide;The reinforcing agent is a mixture of zirconium oxide and titanium dioxide;The surface modifier is a mixture of zinc oxide and strontium oxide;The glass substrate is polished by polishing liquid: the raw material composition of the polishing liquid includes silicon oxide, aminotrimethylenephosphonic acid, composite dispersing agent, buffer, deionized water;The composite dispersing agent is a mixture of sodium polyacrylate and sodium dodecylbenzenesulfonate.The glass substrate for chip packaging prepared by the application has excellent mechanical strength and flatness.

This invention belongs to the field of ceramic liner preparation technology, specifically relating to a wear-resistant ceramic liner and its preparation method. The wear-resistant ceramic liner is composed of the following raw materials: alumina, sintering aid, aluminum titanate, modified urea-formaldehyde resin microspheres, hafnium boride, tungsten disilicide, and KH-550 silane coupling agent. The sintering aid is a mixture of niobium pentoxide, strontium oxide, lanthanum oxide, and magnesium oxide. The wear-resistant ceramic liner of this invention uses alumina as the main raw material, a mixture of niobium pentoxide, strontium oxide, lanthanum oxide, and magnesium oxide as the sintering aid, a composite of modified urea-formaldehyde resin microspheres, hafnium boride, and tungsten disilicide as the reinforcing and toughening phase, and aluminum titanate as a modifier. The synergistic effect of the raw materials ensures that the prepared ceramic liner has good wear resistance, hardness, and toughness.

The invention relates to the fields of chemical industry, pyrotechnic compositions, fireworks and crackers and the like, and relates to preparation of strontium fumarate serving as a novel compound material with coloring agent and reducing agent effects, and preparation and application of the material in the fields of pyrotechnic compositions, fireworks and crackers and the like. The preparation method comprises the following steps: mixing fumaric acid and strontium carbonate or strontium oxide or strontium hydroxide, and heating an aqueous solution to prepare strontium fumarate; furthermore, strontium fumarate can be fully mixed with selected other substances to prepare a red pyrotechnic composition, and the red pyrotechnic composition can be applied to fireworks and crackers and other fields; in addition, strontium fumarate is mixed with other selected substances, a small amount of perchlorate can be selectively added to be fully mixed to prepare non-pyrotechnic composition or pyrotechnic composition substances in various geometrical shapes, and then the substances are placed in handheld, ground and air (including an aircraft) devices or equipment to be used for preparing the non-pyrotechnic composition or pyrotechnic composition. The non-pyrotechnic composition and the pyrotechnic composition substance can be ignited according to the electronic heating principle, and red light is emitted through combustion for color development.

This invention belongs to the field of welding materials technology, specifically providing a single-sided welding double-sided forming backing flux, comprising the following raw material components by mass percentage: fused magnesia: 20-40%; quartz: 25-35%; zircon sand: 8-18%; fluorite: 5-15%; ferrosilicon: 3-10%; ferrotitanium: 3-10%; ferroboron: 1-2%; α-alumina: 1-5%; manganese oxide: 1-5%; strontium oxide: 0.5-1.5%; yttrium oxide: 0.5-1%; iron powder: 3-10%; phenolic resin: 2-10%. This backing flux is suitable for double-wire or triple-wire single-sided welding double-sided forming processes, and can meet the welding requirements of 10-35mm large ship panel DH36, EH36, DH40, EH40, etc. It is suitable for high heat input and high efficiency welding, with uniform and stable weld formation, no porosity or indentation, automatic slag removal, and excellent crack resistance.

The application discloses a kind of steel identification traceability with high temperature ink and preparation method thereof, it is related to high temperature ink technical field, to solve the problem that prior art cannot meet the comprehensive application needs of steel high temperature online identification, low light high efficiency identification, by weight parts include: 20-30 parts rare earth glass frit powder, 5-10 parts inorganic pigment, 2-4 parts adhesion agent, 10-20 parts deionized water, 5-12 parts dispersing agent, 20-45 parts humectant, 0.05-0.15 parts defoaming agent, 0.05-0.15 parts PH regulator, 0.03-0.06 parts preservative;The melting temperature of the rare earth glass frit powder is 450-750 DEG C, and it includes by weight parts: 10-30 parts silicon dioxide, 5-10 parts aluminium oxide, 25-35 parts bismuth trioxide, 5-10 parts europium trioxide, 3-5 parts dysprosium trioxide, 5-10 parts boron trioxide, 3-8 parts calcium oxide, 2-4 parts strontium oxide, 1-3 parts magnesium oxide, 3-8 parts sodium oxide, 1-3 parts potassium oxide.The application has the advantages of enhancing the high temperature bonding performance of ink and low light color development and identification.

This invention provides a supported cobalt-based catalyst for Fischer-Tropsch synthesis and its preparation method. The catalyst consists of cobalt tetroxide, a metal auxiliary oxide, and a support; the metal auxiliary oxide includes any one of zinc oxide, magnesium oxide, strontium oxide, barium oxide, or ferric oxide; the support is MAl2O4@Al2O3, where M is any one of Fe, Zn, Mg, Cu, Ni, or Co. The preparation method includes: quantitatively weighing the nitrate of metal M according to the catalyst composition, impregnating its aqueous solution in alumina, and subjecting it to a first drying, a first calcination, hydrothermal treatment, a second drying, and a second calcination to obtain the MAl2O4@Al2O3 support; quantitatively weighing the cobalt salt and the auxiliary metal salt according to the catalyst composition, impregnating their mixed aqueous solution onto the support, and subjecting it to a third drying and a third calcination. This invention solves the problem that the poor thermal conductivity of the support affects the catalytic performance of traditional cobalt-based catalysts in Fischer-Tropsch synthesis. It exhibits good thermal conductivity, high strength, strong industrial adaptability, and a simple method, making it easy to promote and use industrially.

This application discloses a composite metal oxide catalyst, its preparation method, and its application. The composite metal oxide catalyst comprises a support and metal oxides supported on the surface of the support; the metal oxides include metal oxide I, metal oxide II, and metal oxide III; metal oxide I is selected from at least one of manganese oxide, ferrous oxide, cobalt oxide, nickel oxide, copper oxide, and zinc oxide; metal oxide II is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; metal oxide III is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; the loading amount of metal oxide I is 0.1–20 wt%, the loading amount of metal oxide II is 0.01–5 wt%, the loading amount of metal oxide III is 0.01–5 wt%, and the remainder is the support.

A method for producing a methane reforming catalyst according to one embodiment of the present application includes the steps of preparing a solution containing a precursor of a perovskite compound represented by Chemical Formula 1; and coating a support with the solution and then performing a heat treatment process to produce a catalyst, where the precursor of the perovskite compound represented by Chemical Formula 1 contains strontium hydroxide.

A method includes providing a precursor powder mixture containing lanthanum oxide particles, strontium oxide particles, manganese oxide particles and cobalt oxide particles and calcining the precursor powder mixture, such that a lanthanum strontium manganate-manganese cobalt oxide composite powder containing composite particles including perovskite and spinel phases is formed.

The invention discloses a magnetic therapy rod capable of generating a static magnetic field for killing bacteria, tumor cells and viruses, the magnetic therapy rod comprises a shell and a magnetic therapy rod body, a containing cavity is formed in the shell, the magnetic therapy rod body is located in the containing cavity, the magnetic therapy rod body is formed by connecting a plurality of magnetic rods end to end, and the magnetic poles of the magnetic rods are alternately arranged in a heteropole mode. The magnetic bar comprises the following raw materials in percentage by weight: 97%-98.4% of strontium iron oxide, 0.20%-0.50% of aluminum oxide, 0.20%-0.50% of silicon dioxide, 0.04%-0.07% of phosphorus pentoxide, 0.04%-0.5% of sulfur oxide, 0.3%-0.7% of calcium oxide, 0.03%-0.06% of titanium oxide, 0.5%-0.70% of manganese oxide and 0.04%-0.06% of nickel oxide. According to the magnetic therapy rod capable of generating the static magnetic field for killing bacteria, tumor cells and viruses, the static magnetic field can be generated, the bacteria, the tumor cells and the viruses are killed through the static magnetic field, and effective treatment on cervical cancer, vaginitis and HPV is achieved.

The invention provides a method for preparing metal oxide, oxygen and carbon by using carbonate, which comprises the following steps: S11, heating and decomposing carbonate at 600-850 DEG C to generate metal oxide and carbon dioxide; s12, deoxidizing and reducing carbon dioxide at the reaction temperature of 300-900 DEG C, and generating carbon monoxide and oxygen from the carbon dioxide generated in the step S11 under the condition of a carbon dioxide reduction catalyst; s13, carbon is prepared through carbon monoxide disproportionation, the reaction temperature is 150-550 DEG C, carbon monoxide generated in the step S12 generates carbon and carbon dioxide under the condition of a carbon monoxide disproportionation catalyst, the carbon monoxide disproportionation catalyst comprises a third component and a fourth component, the third component comprises one of copper, zinc, iron, cobalt, nickel and manganese, and the fourth component comprises one of copper, zinc, iron, cobalt, nickel and manganese. And the component IV comprises one or two of zinc oxide, aluminum oxide, copper oxide, magnesium oxide, calcium oxide, strontium oxide and iron oxide.

To develop a composite of a new constitution containing a powder having a radiation shielding function in a high content.SOLUTION: Molten aluminum is impregnated and filled into all voids of a preform made of a mixture containing one or more kinds of radiation shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder and a liquid silica-based binder, the mixture containing the radiation shielding powders in a range of 3 to 85% in total; In the composite body having the radiation shielding function and the method for manufacturing the same, a liquid organic-inorganic sealing agent is impregnated and solidified to form the composite body, and a liquid silica-based binder has characteristics capable of forming a preform at a temperature at which the radiation shielding powder is not decomposed.SELECTED DRAWING: None

The purpose of the present invention is to develop a composite having a novel configuration and containing a powder having a radiation-shielding function at a high content rate. A composite having a radiation shielding function, which contains a radiation shielding powder in an amount of 3-85% in total, and which is obtained by impregnating / filling molten aluminum into all the voids of a preform and solidifying and compositing the same, and a method for producing the composite, or a complex obtained by impregnating 25% or more of the voids of the preform with a liquid organic / inorganic sealant, curing, and compounding, the preform being formed from a mixture, the radiation shielding powder is selected from the group consisting of gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder and ferrite powder, and the silica-based binder is in a liquid state. The liquid silica-based binder has the characteristic of being capable of forming a preform at a temperature at which the radiation shielding powder does not decompose.

Provided is an anode for alkaline water electrolysis comprising a conductive substrate and a coating formed on a surface of the conductive substrate, wherein the coating comprises1) a lithium-containing nickel oxide,2) an iridium oxide, and3) at least one of a strontium oxide, a lanthanum oxide, and a calcium oxide.

This invention discloses a samarium single-atom and strontium-doped neodymium oxide composite catalyst and its preparation method, as well as a nonylphenol electrochemical sensor and its application. The preparation of the composite catalyst includes adding resorcinol, formaldehyde solution, and Sm(NO3)3·6H2O to an anhydrous ethanol-based colloidal suspension for sol-gel formation, followed by carbonization and etching to obtain Sm-SAC. A first solution containing strontium hydroxide and neodymium nitrate hexahydrate is added dropwise to a second solution containing 1,2,3-triazole, trimesic acid, and polyvinylpyrrolidone to prepare a Sr-Nd bimetallic precursor, followed by annealing to obtain strontium-doped neodymium oxide. Sm-SAC and strontium-doped neodymium oxide are then added to water for ultrasonic dispersion, centrifugation, washing, and drying to obtain the composite catalyst. The composite catalyst of this invention exhibits strong adsorption capacity, high-efficiency electrocatalytic oxidation activity, excellent anti-interference ability, and structural stability. The sensor demonstrates high recovery rate, low signal attenuation, and excellent reusability.