151 results about "Cerium(IV) oxide" patented technology

The invention provides a low-smoke halogen-free flame-retardant cable material and a preparation method thereof, and belongs to the field of cable materials. The low-smoke halogen-free flame-retardant cable material is prepared from the following chemical components: 32 to 40 parts of nitrile rubber, 22 to 27 parts of natural rubber, 8 to 12 parts of benzoxazole-siloxane copolymer containing phosphate dynamic bonds, 13 to 15 parts of core-shell-sheath three-stage structure flame retardant, 4 to 6 parts of hexaphenoxy cyclotriphosphazene modified carbon nanotubes, 2 to 3 parts of europium-doped mesoporous cerium dioxide and 3 to 4 parts of nano zinc oxide. The composite material is prepared from the following components in parts by weight: 3 to 4 parts of carbon nanotube grafted montmorillonite hybrid, 2 to 3 parts of lubricant, 0.8 to 1.2 parts of cross-linking agent, 0.3 to 0.4 part of accelerant, 0.4 to 0.6 part of dicumyl peroxide and 0.1 to 0.2 part of antioxidant. Unification of high flame retardance, low smoke, excellent mechanical property and processability of the cable material is realized.

The invention discloses high-toughness ultrathin flexible glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The ultrathin flexible glass is prepared from the following raw materials: silicon dioxide, aluminum oxide, lithium oxide, sodium oxide, magnesium oxide, a modified nano reinforced phase, a high-temperature melting regulator and cerium dioxide. The modified nano reinforced phase is prepared by the following steps: pre-treating silicon carbide and silicon nitride with hydrochloric acid, and mixing with nano zirconium oxide to obtain a mixture; and modifying the mixture with a silane coupling agent to obtain the modified nano reinforced phase. The high-temperature melting regulator is a mixture of lithium borate, sodium sulfate and lithium fluoride. The preparation method of the ultra-thin flexible glass comprises the following steps: preparing the modified nano reinforced phase, melting and homogenizing the glass, forming the glass substrate, and preparing the ultra-thin flexible glass. The ultra-thin flexible glass prepared by the invention has relatively high fracture toughness and structural rigidity, excellent flexibility and bending fatigue durability, and excellent thermal shock resistance.

The invention discloses a polyetherketoneketone high-temperature-resistant wear-resistant non-stick coating and a preparation method thereof. The coating is prepared from the following components in parts by mass: 13 to 30 parts of a resin matrix group (containing 12 to 25 parts of titanium modified polyether ketone ketone resin, 1 to 5 parts of fluorine-free viscous resin and 0.65 to 6 parts of aluminum oxide), 0.5 to 3 parts of a nano reinforced group (containing 0.5 to 3 parts of KH-550 modified nano titanium dioxide, 0.025 to 0.6 part of cerium dioxide and 0.5 to 3 parts of boron nitride) and 62 to 71 parts of an auxiliary agent group. The preparation method comprises the following steps: 1) taking diphenyl ether, paraphthaloyl chloride and isophthaloyl chloride as monomers, and synthesizing titanium modified polyether ketone ketone resins with different viscosities through segmented polymerization (1.5-2.0 hours or 3.0-4.0 hours); 2) respectively preparing a smooth bottom layer water dispersion slurry and a wrinkled surface layer water dispersion slurry; and (3) forming a compact bottom layer and a micro-wrinkle surface layer on the base material by adopting a layered spraying and stepped sintering process (280-320 DEG C, 10-20 minutes). The whole system of the coating is fluorine-free and has temperature resistance gt; the coating has the characteristics of high temperature resistance (350DEG C), wear resistance (Taber wear rate of 3-5mg / 1000r), non-sticking (contact angle gt, 100 DEG C) and heavy corrosion resistance, and is suitable for cooking utensils and chemical equipment.

The invention discloses high-strength high-temperature-resistant fireproof industrial glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The industrial glass is prepared from the following raw materials: silicon dioxide, boric oxide, aluminum oxide, sodium oxide, potassium oxide, niobium phosphate, a composite reinforcing component and a clarifying agent, the composite reinforcing component is prepared from hafnium oxide, gadolinium oxide and zinc oxide; the clarifying agent is obtained by mixing cerium dioxide and tin oxide. The preparation method of the industrial glass comprises the following steps: preparing functional components, melting glass, forming a glass substrate, and preparing the industrial glass. The prepared industrial glass is high in strength, good in high-temperature stability and excellent in fireproof performance.

The invention relates to the technical field of biomass-based semiconductor bifunctional materials and environmental restoration, in particular to a Baijiu vinasse biochar / cerium oxide / cadmium zinc sulfur solid solution heterojunction bifunctional material as well as a preparation method and application of the Baijiu vinasse biochar / cerium oxide / cadmium zinc sulfur solid solution heterojunction bifunctional material. The method comprises the following steps: in an inert atmosphere, carrying out pyrolysis on waste Baijiu vinasse to obtain biochar; the method comprises the following steps: mixing biochar and an activator, and carrying out activation pyrolysis in an inert atmosphere to obtain alkali-activated biochar; the preparation method comprises the following steps: dispersing a cadmium source, a zinc source, thiourea, a surfactant, alkali-activated charcoal and cerium dioxide in a solvent to form a dispersion liquid, and carrying out a heating reaction to obtain the Baijiu vinasse charcoal / cerium oxide / cadmium-zinc-sulfur solid solution heterojunction bifunctional material. The adsorption performance of the material is improved due to the remarkable specific surface area of the alkali-activated biochar component; the construction of the cerium oxide / cadmium zinc sulfur solid solution heterojunction significantly accelerates the migration of photon-generated carriers, endows the material with excellent adsorption-photocatalytic performance, has good reusability, and can remove pesticide pollutants in water.

The application discloses a kind of corrosion-resistant aluminum alloy profiles and preparation method thereof, belong to aluminum alloy profile technical field.The application can ensure the strength of aluminum alloy profile by optimizing the composition of corrosion-resistant aluminum alloy, and has a positive effect on the corrosion resistance of aluminum alloy profile.In addition, the application forms a corrosion-resistant coating on the surface of the corrosion-resistant aluminum alloy substrate by laser cladding, which can significantly improve the corrosion resistance of the aluminum alloy profile while ensuring the application performance of the aluminum alloy profile.In the corrosion-resistant coating, nickel powder can enhance the resistance to pitting and intergranular corrosion, and improve the adhesion to the aluminum alloy substrate.Boron nitride can improve the surface acid resistance and wear resistance of the aluminum alloy profile, and block the corrosion channel.Lanthanum oxide and cerium dioxide have a synergistic effect, which can refine the surface grains, reduce the pores generated during the cladding process, improve the compactness of the coating, promote the compatibility with the aluminum alloy substrate, and ensure the appearance quality of the aluminum alloy profile.

The invention discloses a high-temperature-resistant inorganic antibacterial ceramic glaze and a preparation process, and relates to the technical field of ceramic glaze preparation, the glaze is composed of a basic glaze and a zinc oxide-doped cerium dioxide inorganic antibacterial agent, and the basic glaze comprises feldspar, quartz, kaolin, calcite and talc. The preparation process comprises the following steps: mixing the raw materials, carrying out wet ball milling, adding the antibacterial agent and the dispergator, stirring at a high speed, sieving to remove iron, aging, glazing and sintering at a high temperature. In the process, an iron removal integrated unit integrating a two-stage vibration screening function and an automatic iron scraping function is adopted, and efficient and continuous iron removal operation is achieved. The obtained glaze can resist high-temperature sintering of 1150-1200 DEG C, the glaze surface is smooth and uniform, the glaze surface has lasting and efficient broad-spectrum antibacterial performance, glaze surface defects caused by iron impurities are effectively avoided, and the product yield and quality stability are improved.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the hexagonal cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 3.5-6, and carrying out sol-gel reaction to obtain hexagonal cerium dioxide sol; and (3) carrying out post-treatment on the hexagonal cerium dioxide sol to obtain the hexagonal cerium dioxide. According to the preparation method of the hexagonal cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the hexagonal cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

The application relates to the technical field of isotope separation, in particular to a SiO2@CeO2 core-shell material with silica supported cerium dioxide, a preparation method thereof and application of the SiO2@CeO2 core-shell material in Ge / Ga separation. 68 Efficient adsorption of Ge and 68 Effective elution of Ga; the SiO2@CeO2 core-shell material is used as a stationary phase, hydrochloric acid is used as a mobile phase, Ge / Ga is efficiently separated based on solid-phase extraction, and therefore the SiO2@CeO2 core-shell material can be used as 68 Ge- 68 Ga generator column packing.

This invention belongs to the field of glass technology and relates to a high-temperature resistant structural glass material, its preparation method, and its applications. The glass is composed of the following components by mass percentage: 60%-70% silicon dioxide, 5.5%-11% boric acid, 0.1%-5% aluminum hydroxide, 0%-3% potassium nitrate, 5.5%-13% potassium carbonate, 0%-12% sodium carbonate, 0.1%-4% calcium carbonate, 0%-2% calcium fluoride, 0%-1% lithium carbonate, 0%-2% basic magnesium carbonate, 0.1%-1% titanium dioxide, 0%-2% zirconium dioxide, and 0%-1% cerium dioxide; the total mass percentage of potassium nitrate, potassium carbonate, sodium carbonate, and lithium carbonate does not exceed 22%. This structural glass possesses a high softening temperature, a suitable coefficient of thermal expansion, high-temperature resistance, thermal shock resistance, and processing performance, making it suitable as a structural material for optoelectronic devices.

The invention discloses a rare earth element modified nickel-based nano-catalyst and a preparation method and application thereof.The rare earth element modified nickel-based nano-catalyst comprises a carrier and an active component loaded on the carrier, and the carrier is cerium dioxide and yttrium oxide co-doped three-dimensional ordered silicon dioxide nanoparticles; the active component is metal nickel. The application refers to the application of the catalyst in preparation of synthesis gas through carbon dioxide methane reforming. According to the invention, rare earth element doped and modified three-dimensional ordered silicon dioxide nanoparticles are used as a carrier, nickel metal is loaded on the nanoparticles, and the problem of carbon deposition can be effectively reduced by adjusting the interaction of alkaline sites and oxygen vacancies on the surface of the catalyst and the metal carrier. The method provided by the invention is helpful for realizing industrialization of a carbon dioxide methane catalytic reforming reaction, realizing a carbon emission reduction target and solving a green electricity energy storage problem.

This invention provides an anti-fouling and anti-wear polyurea coating, its preparation method, and its application method, belonging to the field of petroleum drilling and production technology. The coating includes a primer and a topcoat; the topcoat includes component A and component B. Component A includes: isophorone diisocyanate, polyethylene glycol, a dispersion of partially reduced graphene oxide modified with α-Al₂O₃ and YSZ nanopowders, and a mixture of α-Al₂O₃ micro / nano powders and YSZ micro / nano powders; component B includes: a chain extender, terminal amino polyethers, a diluent, a foaming agent, modified nano-molybdenum disulfide, and additives; the primer includes component C and component D. Component C includes: isophorone diisocyanate, polyethylene glycol, a dispersion of partially reduced graphene oxide modified with cerium dioxide nanopowders, a mixture of cerium dioxide micro / nano powders and yttrium oxide-stabilized zirconium oxide micro / nano powders; component D includes: a chain extender, terminal amino polyethers, a diluent, a foaming agent, modified nano-cerium dioxide, and additives.

This invention discloses a nickel or nickel oxide-supported cerium dioxide-doped lithium aluminum hydride hydrogen storage material, prepared by mechanical ball milling of a supported sample and lithium aluminum hydride. The supported sample is obtained by calcining a precipitate formed by mixing nickel nitrate as the nickel source and cerium nitrate as the cerium source with sodium hydroxide solution in a certain weight ratio and heating. The supported sample is either nickel-supported cerium dioxide or nickel oxide-supported cerium dioxide, named Ni@CeO2 and NiO@CeO2, respectively. The preparation method includes: step 1) preparation of nickel or nickel oxide-supported cerium dioxide; step 2) preparation of the nickel or nickel oxide-supported cerium dioxide-doped lithium aluminum hydride hydrogen storage material. For application in the field of hydrogen storage, the final system's hydrogen release temperature is reduced to 63.9 to 93.5℃, the hydrogen release amount reaches 6.7 to 7.1 wt%, and the hydrogen release rate is 88.94 to 96.03%. This invention achieves improved hydrogen storage material performance at lower temperatures.

The invention relates to the technical field of electrode material preparation, in particular to a supported iridium-based catalyst with a carrier surface rich in hydroxyl and a preparation method and application thereof.The preparation method comprises the steps that cerous nitrate, sodium hydroxide and water are mixed and subjected to a hydrothermal reaction, and a cerium dioxide precursor is obtained; mixing the cerium dioxide precursor, a hydrogen peroxide solution, a sulfuric acid solution and water, and reacting to obtain an intermediate of which the surface is loaded with hydroxyl; and mixing the intermediate of which the surface is loaded with hydroxyl, iridium metal salt and an alcohol solvent, and carrying out reduction reaction to obtain the supported iridium-based catalyst of which the carrier surface is rich in hydroxyl. The preparation method provided by the invention is a universal preparation method of a nanoparticle electrode material, the process is simple, the operation is convenient, the cost is low, and the prepared catalyst has good electrochemical activity and high stability, can show relatively excellent electrochemical performance in an electrolyzed water OER reaction, and is suitable for industrial production. And a new research scheme is provided for industrial application of electrolyzed water.

The invention belongs to the technical field of metallurgy, and relates to a complex gold concentrate multi-element comprehensive recovery method which comprises the following steps: S1, complex gold concentrate and an auxiliary material I are subjected to bottom blowing smelting in a bottom blowing furnace in an oxygen-enriched air atmosphere to obtain matte, bottom slag and flue gas; s2, copper matte and an auxiliary material II are subjected to top-blowing blowing in a top-blowing furnace in the air atmosphere, and crude copper, flue gas and blowing slag are obtained; s3, refining the crude copper and carbonate in an air atmosphere, introducing methane gas after the reaction is finished, and reducing in an inert atmosphere to obtain a copper anode plate; wherein in the step S1, in the bottom blowing smelting process, a coking inhibitor composed of aluminum oxide, calcium oxide, sodium carbonate, ammonium molybdate, sodium borate and cerium dioxide is blown in an ascending flue of a bottom blowing furnace, the occurrence of the coking condition can be effectively reduced, and the complex gold concentrate recovery production start-up rate is increased.

The invention provides a functional filler, a preparation method thereof, a fireproof heat-insulating coating and application, and belongs to the technical field of coatings. The preparation method of the heat-insulating functional filler with the core-shell structure comprises the following steps: coating cerium dioxide and titanium dioxide in silicon dioxide by adopting a sol-gel method and a high-temperature sintering technology to form the core-shell structure; the core-shell structure is composed of a fully-coated core-shell structure and a semi-coated core-shell structure. The silicon dioxide has a hollow core-shell structure, and the cerium dioxide and the titanium dioxide are filled in a shell of the silicon dioxide core-shell structure. The fireproof heat-insulating coating is prepared by compounding the fireproof heat-insulating functional filler with the core-shell structure prepared by adopting a sol-gel method and a high-temperature sintering technology and the intumescent flame retardant, and the coating has excellent fireproof, heat-insulating and fireproof performance; the fireproof heat-insulating coating is sprayed on the surface of carbon steel to form a coating, when the thickness of the coating is 10 mm, acetylene flame ablation is resisted for 60 min, and the back temperature of the carbon steel is smaller than or equal to 280 DEG C.

The application provides a sound insulation rubber composite material and a preparation method and application thereof, and belongs to the technical field of rubber, and the preparation method comprises the following steps: butyl rubber and ethylene-propylene-diene rubber are added into a banbury mixer for plasticizing, then carbon black, a metal oxide compound, a modifying additive, a vulcanization activator and an antioxidant are added for mixing, vulcanization accelerators and vulcanization agents are further added for mixing, and then glue is discharged to obtain a rubber compound; the rubber compound is placed in an open mill for thin mixing and storage to obtain a mixed rubber; the mixed rubber is vulcanized on a flat vulcanizing machine to obtain the sound insulation rubber composite material; wherein the metal oxide compound is prepared by calcining and crushing cerium dioxide, titanium dioxide and silicon dioxide; and the modifying additive is prepared by using a functional polymer and modified hollow glass microbeads; the sound insulation rubber composite material has good sound insulation performance and durability, and the preparation process is simple.

This application relates to the field of rare earth smelting and separation technology, and discloses an ultrasonic-enhanced electrochemical coupling process for the complete separation of rare earth oxides, comprising the following steps: adding a polyphosphate complexing agent and a redox mediator to a cerium-rich rare earth aqueous solution as the anolyte, and pumping it into a dual-chamber membrane electrolytic cell separated by a cation exchange membrane for circulation. An electroacoustic phase-controlled synchronous system is activated to perform periodic reverse-phase pulse operations of turning on the ultrasonic current to decrease and turning off the ultrasonic current to increase. When the trivalent cerium conversion rate reaches a first threshold, the pH is dynamically adjusted and the current is reduced; when it reaches a second threshold, the process is stopped and the temperature is raised to mature the complex salt crystalline phase. The slurry is hot-pressed and filtered; the filter cake is dephosphorized and washed by alkaline solid-phase decomposition, and then calcined at a constant temperature to obtain high-purity cerium dioxide powder. This invention employs a dual-chamber electrolysis technology scheme using polyphosphate complexation combined with a perfluorosulfonic acid cation exchange membrane, achieving the technical effect of zero cathode penetration of rare earth materials.

This invention discloses a method for preparing a cerium dioxide catalyst for ultra-high temperature catalytic water-gas conversion reaction. The method involves first synthesizing cerium dioxide nanoparticles via a hydrothermal method, and then subjecting the nanoparticles to multi-step heat treatment in a gaseous environment to achieve surface modification, resulting in a cerium dioxide catalyst with a large number of exposed coordination unsaturated sites. The catalyst prepared by this method exhibits excellent catalytic performance for water-gas conversion reaction in the ultra-high temperature range above 600℃. Traditional industrial Fe-based catalysts deactivate above 600℃, while the cerium dioxide catalyst prepared by this invention maintains high performance at temperatures above 600℃ and is not easily deactivated. Furthermore, cerium dioxide catalysts are environmentally friendly materials with advantages such as low cost and minimal environmental pollution, showing broad application prospects in industrial water-gas conversion reaction for hydrogen production.

The invention relates to the technical field of copper alloys, in particular to a high-strength and high-conductivity C19400 copper-based composite material and a preparation method thereof. The method mainly comprises the steps that copper powder, iron powder, copper-phosphorus alloy, modified nano TiC and copper-cerium alloy powder are mixed and then subjected to high-energy ball milling, and the high-strength and high-conductivity C19400 copper-based composite material is obtained through vacuum drying, compression molding, pressure sintering and double-stage aging treatment, and the modified nano TiC is subjected to rare earth Ce precursor coating and weak oxidation heat treatment, so that the high-strength and high-conductivity C19400 copper-based composite material is obtained. And a cerium dioxide film layer is formed on the surface in situ, so that the dispersibility of nano TiC and the interface bonding between the nano TiC and a copper matrix can be improved. Through matching of the raw materials and the preparation steps, the effects of precipitation strengthening, dispersion strengthening and interface strengthening can be effectively coordinated, and the strength, the conductivity and the structure stability of the material are improved.

The invention discloses a steel slag-based flue gas desulfurization, denitrification and decarbonization material and method. According to the method, cerium (Ce) and manganese / zinc are co-doped with modified steel slag through a'defect engineering 'strategy, and the method comprises the following specific steps: dissolving cerium salt and manganese / zinc salt to prepare a solution A, mixing the solution A with a sodium hydroxide solution B, performing a hydrothermal reaction, and performing freeze drying and roasting to obtain a nanorod-shaped cerium dioxide material E; steel slag is ball-milled and sieved to obtain a material F; and loading the material E on the surface of the material F through a contact electrification effect to form a final material G. The specific surface area of the obtained material is 100-200 m < 2 > / g, and the cerium-based component is mainly rodlike cerium dioxide. Experiments show that the carbon sequestration performance, the desulfurization performance and the denitration performance of the modified steel slag are improved by 50%-100%, 150%-200% and 40%-80% respectively. The method treats waste with waste, is simple in process, and provides an efficient solution for reducing pollution and carbon in the iron and steel industry.

This invention discloses a composite-structured polymeric COH energetic material and its synthesis method, belonging to the field of energetic materials technology. It solves the problems of high pressure requirements and poor stability in the synthesis of polymeric COH materials in existing technologies. The composite-structured polymeric COH energetic material comprises polymeric CO and polymeric H / CO; wherein, polymeric CO coats polymeric H / CO to form a composite structure, and polymeric H / CO is formed by H-doped polymeric CO. The synthesis method involves adding a catalyst during the high-pressure reaction. The catalyst includes noble metals or noble metal-supported copper oxide or cerium dioxide materials, reducing the pressure required to synthesize the composite-structured polymeric COH energetic material. The synthesis method of this invention requires lower pressure, and the composite-structured polymeric COH energetic material of this invention exhibits good stability.

The application discloses a nanometer spherical low-temperature rare earth-based denitration and carbon monoxide removal catalyst and a preparation method and application thereof. The catalyst takes alumina as a carrier, takes a composite oxide of manganese dioxide and cerium dioxide as an active component, and takes iron oxide as a cocatalyst. The catalyst synthesized by the method has the advantages of a large specific surface area, sufficient exposure of active sites and nanometer limitation, and can realize the denitration and carbon monoxide removal targets of low-temperature flue gas working conditions of non-electricity industries such as steel and chemical industries.

This invention relates to the field of catalytic material preparation technology, providing a noble metal-embedded mesoporous cerium dioxide hollow sphere composite material, its preparation method, and its applications. The preparation method includes adding an organic acid, an alcoholic organic solvent, a cerium salt, and a noble metal salt to a pure aqueous solution, stirring thoroughly to form a reaction solution; allowing the stirred reaction solution to stand at 150–200°C; washing the solution after standing, and then drying the precipitate; calcining the dried product at 200–300°C. This invention enables the embedding of noble metal nanoparticles into the shell of a cerium dioxide hollow material, effectively inhibiting the migration, aggregation, and deactivation of noble metal nanoparticles in catalytic reactions, resulting in a highly active catalyst material suitable for the catalytic oxidation and degradation of VOCs.

The invention provides a chemical mechanical polishing composition and a method for polishing a base material, and relates to the technical field of chemical mechanical polishing. The chemical mechanical polishing composition includes: ceria abrasive particles; a polyol compound; the composite selective adsorbent comprises phosphate ester and amino acid, the content of the phosphate ester is 0.01-0.3 wt%, and the content of the amino acid is 0.05-0.5 wt%; and water, wherein the pH value of the chemical mechanical polishing composition is 4-5.5. According to the chemical mechanical polishing composition provided by the invention, the phosphate ester and the amino acid are taken as a composite selective adsorbent, and the polyhydric alcohol compound is taken as a polishing accelerant and a stabilizing agent, so that the high polishing rate of the polishing composition on silicon oxide is ensured, and a high silicon oxide / silicon nitride selection ratio and a self-stopping function on the surface of silicon nitride are realized.

The application belongs to the field of advanced oxidation treatment of organic matters, and particularly relates to a cerium dioxide-nitrogen-doped carbon nitride composite photocatalytic material, a preparation method and application thereof. The photocatalytic material comprises cerium dioxide and nitrogen-doped carbon nitride, the cerium dioxide has a sheet structure, and the mass percentage of the cerium dioxide in the photocatalytic material is 0.5-1.5%. The cerium dioxide-nitrogen-doped carbon nitride composite photocatalytic material is mixed with wastewater containing polyvinyl alcohol and subjected to dark treatment, and after saturation adsorption, the photocatalytic degradation reaction is carried out under light. The cerium dioxide-nitrogen-doped carbon nitride composite photocatalytic material has the advantages of good dispersibility and easy recycling and reuse, and is a novel composite photocatalytic material with excellent photocatalytic performance, environmental friendliness and wide application range.

The invention relates to the technical field of silicon wafer processing, in particular to a method for preparing a polished wafer without corrosion pits, which comprises the following steps of slicing, chamfering, wafer grinding, chemical polishing, normal-pressure chemical vapor deposition, end surface treatment, edge polishing, single-side polishing and final cleaning. Most surface defects are removed through multiple times of rough polishing, the surface is further refined through medium polishing, and extremely high surface smoothness and flatness are achieved through fine polishing; and the medium and fine polishing time is prolonged, so that all fine defects can be treated, and corrosion pits on the product are reduced. The cerium dioxide and the benzotriazole are added into the stock solution, due to the fact that the cerium dioxide has good hardness and abrasion resistance and can remove unevenness on the surface of a material, and the benzotriazole can form a protective film to cover the metal surface, tiny scratches or defects in the polishing process can be reduced, and therefore better surface integrity is obtained; and therefore, the polishing consistency and efficiency are improved.

The invention discloses an antioxidant waste magnesium alloy-aqueous solution hydrogen production system and a preparation method thereof, and belongs to the technical field of recycling of hydrogen production materials and waste magnesium alloys. The preparation method comprises the following steps: step 1, putting niobium pentoxide and cerium dioxide into a ball milling tank, and respectively carrying out continuous long-time low-energy ball milling and short-time high-energy ball milling; step 2, calcining the mixed powder to prepare a CeNb2O7 material; step 3, after the waste magnesium alloy is mechanically crushed, performing high-energy ball milling on the crushed waste magnesium alloy and a CeNb2O7 material to prepare waste magnesium alloy-CeNb2O7 composite hydrogen production particles, and performing tabletting and forming on the waste magnesium alloy-CeNb2O7 composite hydrogen production particles; and 4, preparing an aqueous solution, namely dissolving ethylene diamine tetraacetic acid, sodium hexametaphosphate and sodium chloride in water to form the aqueous solution. The preparation process is simple, the cost is low, efficient utilization of the waste magnesium alloy is achieved, and the prepared composite hydrogen production material can be stably stored and transported, can quickly respond to hydrolysis hydrogen production and is suitable for industrial production.

The invention provides low-temperature-resistant persistent purification vehicle-mounted activated carbon and a preparation method thereof, and belongs to the technical field of activated carbon. According to the invention, two functional materials are compounded on the activated carbon, so that a self-driven chemical regeneration purification system is constructed. Wherein the gallium-doped zinc oxide nanorod generates an instantaneous pyroelectric surface potential difference as an internal electrochemical driving force of the system when the environment temperature is changed by utilizing the enhanced pyroelectric effect of the gallium-doped zinc oxide nanorod; the cesium phosphotungstate-coated cerium dioxide particles serving as a pollutant oxidizing agent are used for converting soluble phosphotungstic acid into insoluble cesium salt, so that the long-term stability of the cesium phosphotungstate-coated cerium dioxide particles in a humid environment is improved; a pyroelectric surface potential difference induced by temperature fluctuation is distributed and conducted in a conductive network, so that electrons can be extracted from a reduced center, the high valence state of the electrons is recovered, and online regeneration of the electrons is completed; due to the synergistic effect, the material can self-maintain catalytic activity by utilizing the environmental temperature difference, so that long-acting and persistent purification under the dark and low-temperature conditions is realized.

The application discloses a novel nanocomposite photocatalyst, a preparation method thereof and application of the nanocomposite photocatalyst in photocatalytic reduction of carbon dioxide. The photocatalyst is prepared by using cerium nitrate and trimanganese tetraoxide as raw materials, using a mixed solution of ethanol and water as a solvent and using a muffle furnace for high-temperature calcination. The microstructure of the prepared CeO2 / Mn3O4 nanocomposite photocatalyst is a flower-like structure and contains high-concentration oxygen vacancies. The method solves the problem that pure trimanganese tetraoxide is not suitable for reduction of carbon dioxide by constructing a heterojunction. The CeO2 / Mn3O4 nanocomposite photocatalyst prepared by the method has good photocatalytic reduction activity of carbon dioxide under visible light.