77 results about "Ceric ammonium nitrate" patented technology

The invention discloses an intelligent control method for ceric ammonium nitrate precipitation process continuous production and application, and belongs to the field of intelligent production control, the intelligent control method comprises a hydrogen peroxide section intelligent control method and an ammonia water section intelligent control method, and the method comprises the steps that S1, a server receives V2; s2, a second potential sensor sends V2 ''; the server makes X2 = V2 '-V2, if the absolute value of X2 is within the threshold value, production continues, and if the absolute value of X2 is outside the threshold value, an alarm instruction is output; m1, the server receives the V3; and M2, the third potential sensor sends V3 ''to the server, the server makes X3 = V3''-V3, if the absolute value of X3 is within the threshold value, production continues, and if the absolute value of X3 is outside the threshold value, an alarm instruction is output. The reaction process is intelligently controlled, the process is adjusted in time, unqualified products are prevented from entering the next procedure, and stable quality of the whole procedure is guaranteed.

The invention relates to a polycarboxylic acid water reducer and a preparation method thereof, and the water reducer is prepared from the following raw materials: 45 to 55 percent of isopentenyl polyoxyethylene ether, 28 to 35 percent of acrylic acid, 1.5 to 2.5 percent of modifier, 0.3 to 0.5 percent of ammonium persulfate, 0.03 to 0.06 percent of ascorbic acid, 5 to 8 percent of hydroxyethyl methylacrylate, 0.15 to 0.25 percent of 2, 4-diphenyl-4-methyl-1-pentene and the balance of water. The modifier is prepared from the following raw materials: 1, 5-dichloronaphthalene, p-nitrostyrene, dimethyl sulfate, ceric ammonium nitrate and tetramethylpiperidine oxide. The polycarboxylate superplasticizer has excellent neat paste fluidity and fluidity retention capability, has low 1h time-dependent variable slump which is below 18mm and optimally 10mm when applied to concrete, has a water-reducing rate of more than 40% and a gas content of less than 3.8%, and also has more advantages in compressive strength ratio.

The invention discloses a preparation method of an environment-friendly macromolecular organic flocculant by taking tannic acid and quaternary phosphonium salt as raw materials, and relates to the technical field of solid waste resource utilization and water treatment medicaments. A natural polyphenol compound tannic acid and allyltributylphosphonium bromide are subjected to an addition polymerization reaction under the action of an initiator ceric ammonium nitrate to generate the environment-friendly polymeric flocculant with a branched structure, and the environment-friendly polymeric flocculant is high in charge density and large in molecular weight, has a branched long-chain structure, and can be used for preparing the environment-friendly polymeric flocculant. The sewage treatment agent can efficiently remove pollutants in water under the condition of low dosage, can adapt to various wastewater treatment scenes, is wide in application range, and has higher economical efficiency and environmental friendliness.

Provided are a metal-organic framework nanomaterial, a preparation method therefor, and a use thereof, belonging to the technical field of bionanomaterials, and resolving the technical problem of inhibiting atherosclerosis using biomimetic metal-organic framework nanoenzymes. The solution is: the components of the of the metal-organic framework nanomaterial and the ratio thereof are: metal ions Ce4+ and a ligand fumaric acid in a molar ratio of 1:5. The preparation method therefor is: measuring an FA regulator and water to prepare a mixed solution, then adding fumaric acid and cerium ammonium nitrate dropwise into the mixed solution, stirring at room temperature, centrifuging, repeatedly washing alternately with water and ethanol, and finally drying overnight in a vacuum oven. A simple, efficient and convenient method for synthesizing the metal-organic framework nanomaterial is provided. The synthesized metal-organic framework nanomaterial has excellent CEH-like enzyme activity and intrinsic antioxidant activity, and can be used to increase lipid efflux and reduce lipid uptake, and decrease ox-LDL-induced foam cell formation, thereby alleviating atherosclerosis.

The invention relates to the technical field of air filter elements, in particular to an iron-manganese-based filter element material for catalyzing and purifying VOCs (volatile organic compounds) at room temperature and a preparation method of the iron-manganese-based filter element material. The iron-manganese-based filter element material for catalyzing and purifying the VOCs at the room temperature is prepared from the following raw materials in parts by mass: 20 to 30 parts of ferrous sulfate, 30 to 40 parts of manganese sulfate, 0.1 to 1 part of ceric ammonium nitrate, 1 to 2 parts of hexadecyl trimethyl ammonium bromide, 1 to 3 parts of urea steam, 5 to 15 parts of attapulgite clay, 1 to 5 parts of aerogel aid and 1 to 5 parts of sodium alginate. The preparation method is simple, the adsorption capacity and the adsorption capacity of indoor volatile organic pollutants such as formaldehyde are greatly improved, the formaldehyde removal efficiency can be improved, the service life of the material can be prolonged, and the material is suitable for large-scale popularization and application.

The invention discloses a non-woven fabric made of Juncao fibers, and belongs to the technical field of textiles. The non-woven fabric made of the Juncao fibers is obtained by opening and mixing modified Juncao regenerated cellulose fibers, carding to form a net and needling and reinforcing; the modified pennisetum sinese regenerated cellulose fiber is prepared by the following steps: dipping dried pennisetum sinese pulp, squeezing, carrying out graft copolymerization on the squeezed dried pennisetum sinese pulp, 2-acrylamide-2-methylpropanesulfonic acid and benzaldehyde PEG acrylamide under the catalysis of ceric ammonium nitrate, dissolving, then adding chamomile essential oil microcapsules, reacting, and spinning. The chamomile essential oil microcapsule is prepared by the following steps: dispersing chamomile essential oil into a continuous phase containing an allyl monomer by an SPG membrane emulsification method to form a microemulsion, and preparing the chamomile essential oil microcapsule by combining an interfacial polymerization method; wherein the allyl monomer is prepared from methacrylic acid, methyl methacrylate, pentaerythritol tetraacrylate and N-(4-acetylphenyl) prop-2-acrylamide.

The invention discloses a UiO-66 (Ce) / ZnO composite photocatalyst as well as a preparation method and application thereof, and relates to the technical field of photocatalytic degradation of water pollution. The method specifically comprises the following steps: preparing zinc oxide by taking zinc acetate dihydrate, absolute ethyl alcohol and sodium hydroxide as raw materials; and dispersing the obtained zinc oxide in a DMF solution containing terephthalic acid, adding a ceric ammonium nitrate aqueous solution, and carrying out a heating reaction to synthesize the UiO-66 (Ce) / ZnO composite photocatalyst. According to the invention, ZnO and UiO-66 (Ce) are used for constructing a heterojunction for the first time, and the design not only widens the visible light response range, but also significantly improves the charge separation efficiency, thereby greatly enhancing the photocatalytic performance. The preparation process is simple and convenient, and the conditions are environment-friendly. The degradation rate of the obtained composite photocatalyst on tetracycline in waste water under visible light can reach 91.2%, the composite photocatalyst has good recoverability and reusability, a new scheme is provided for efficient degradation of organic pollutants, and the composite photocatalyst has remarkable advantages in the field of environmental protection.

The invention relates to the technical field of silicon carbide ceramic materials, and particularly discloses a preparation method of high-performance silicon carbide granulation powder. The method comprises the following steps: S1, preparing a composite adhesive system; s2, pre-dispersing the slurry; s3, ball milling dispersion; s4, mixing and size mixing; s5, spray drying; and S6, low-temperature activation. The adhesive is a ceric ammonium nitrate-ascorbic acid-dicyandiamide composite catalytic oxidation system, in the low-temperature activation stage, high-activity Ce < 3 + > generated by reaction of ceric ammonium nitrate and ascorbic acid efficiently catalyzes and cuts off polyvinyl alcohol molecular chains and promotes thorough decomposition of the polyvinyl alcohol molecular chains, dicyandiamide is decomposed to release gas to form a micro-channel, and a local atmosphere is created; the carbon residual rate is remarkably reduced to 0.06% or below, the apparent density is larger than or equal to 0.85 g / cm < 3 >, the porosity of a sintered body is smaller than or equal to 0.7%, and the technical problems of residual carbon control and uniform forming are solved.

The invention provides a cerium-based metal organic framework as well as a preparation method and application thereof, the cerium-based metal organic framework is obtained by uniformly mixing a cerium salt solution and a regulator, then carrying out a primary microwave heating reaction, then adding a ligand, carrying out a secondary microwave heating reaction, and then washing and drying, the cerium salt is ceric ammonium nitrate, and the ligand is cerium nitrate. The ligand is terephthalic acid, and the regulator is acetic acid. According to the method, the UiO-66 (Ce) with bionic Lewis acid sites is designed through microwave-assisted heating and by utilizing acetic acid to regulate the local chemical environment of the UiO-66 (Ce), so that the activity of hydrolase is greatly improved, a large number of oxygen vacancies can be induced, the activity of oxidase is improved, efficient degradation of glyphosate is realized, and the method has a wide application prospect in the aspects of glyphosate hydrolysis and detection.

The application provides a synthesis method of active piperidone alkaloid, and the active piperidone alkaloid is Dysidone A. The raw material piperidine is used as a substrate, and the substrate is reacted with p-methoxy benzyl chloride under the condition of N,N-diisopropylethylamine, so that the secondary amine is protected, and the side reaction of sodium hydride and hydrogen on the secondary amine is avoided. Then, the secondary amine is oxidized under the condition of iodine and iodobenzenediacetic acid. Next, the secondary amine is reacted with triethyl phosphine acetic acid ester to obtain an alpha, beta unsaturated ester. Then, the p-methoxy benzyl protection is removed by using ammonium cerium nitrate in a mild and efficient manner. Finally, the ester is reduced into an alcohol by using diisobutylaluminum hydride. The piperidone alkaloid or the like is obtained through five reaction steps. The synthesis process is simple, the raw material is cheap and easy to obtain, the cost is low, the reaction condition is relatively mild, the purity is high, and the method has good economic and social benefits.

This invention discloses a cerium-doped diatom-based silicon-carbon anode material, its preparation method, and its application, belonging to the technical field of lithium battery anode materials and their preparation. Using a diatom shell as a framework, a bio-doping method is employed. When the diatoms grow to the early logarithmic phase in a culture medium, cerium ammonium nitrate is added to the diatom culture medium for co-cultivation. The co-cultivated diatom shells are then calcined at high temperature to obtain the cerium-doped diatom-based silicon-carbon anode material. This invention employs a two-stage cultivation strategy, introducing cerium ammonium nitrate after the diatoms have reached the early logarithmic phase to avoid toxic inhibition during the growth-sensitive period. Simultaneously, it utilizes the efficient absorption and doping capabilities of diatoms during the active biomineralization phase, achieving a balance between high doping efficiency and structural integrity. This method utilizes the biomineralization capabilities of diatoms to achieve uniform elemental doping, resulting in a simple, low-cost, and environmentally friendly process; providing a new approach for the development of high-performance silicon-carbon anode materials.

The invention discloses an antibacterial moisture-permeable polyester material and a preparation method thereof, and belongs to the technical field of polyester materials. The antibacterial moisture-permeable polyester material is prepared from the following raw material components in parts by mass: 100 parts of antibacterial polyester, 4 to 8 parts of super absorbent resin, 0.4 to 0.6 part of antioxidant and 3 to 5 parts of porous filler, the antibacterial polyester is obtained by at least taking unsaturated dibasic acid monomers and polyol monomers as raw materials, butyl titanate as a catalyst and hydroquinone as a polymerization inhibitor, carrying out esterification and polycondensation, then carrying out bromine addition, and finally reacting with N, N-dimethyl-3-nitrobenzamide. The superabsorbent resin is synthesized by taking a starch-based raw material, acrylamide and N-(4-nitrophenyl) acrylamide as reaction monomers, N, N '-methylene bisacrylamide as a cross-linking agent and ceric ammonium nitrate as an initiator, and the porous filler is prepared by firstly synthesizing an imidazolyl ionic liquid from trimethylimidazole and chloromethylnaphthalene and then adopting an external cross-linking method.

The invention discloses a preparation method of an oteconazole intermediate, and relates to the technical field of oteconazole preparation. According to the preparation method disclosed by the invention, an olefin intermediate B is prepared from a carbonyl intermediate C, and an intermediate A is obtained from the intermediate B under the action of ceric ammonium nitrate and sodium nitrite; the method has the advantages of cheap and easily available raw materials, simple reaction operation, mild reaction conditions, low requirements on equipment and easiness in industrial large-scale production. The target product conversion rate is high, the purification operation is simple, and the economic value is relatively high.

The application discloses a synthesis method of 3,4-dimethyl-6-nitrophenol, which comprises the following steps: S1, 3,4-dimethylphenol and silica gel are added into an organic solvent, after the 3,4-dimethylphenol is dissolved, heating and concentration are carried out at 50-80 DEG C, until the organic solvent is evaporated, and the silica gel containing 3,4-dimethylphenol is obtained; S2, cerium ammonium nitrate and silica gel are added into an organic solvent, after the cerium ammonium nitrate is dissolved, heating and concentration are carried out at 50-80 DEG C, until the organic solvent is evaporated, and the silica gel containing cerium ammonium nitrate is obtained; S3, a silica gel column is taken, the silica gel containing 3,4-dimethylphenol and the silica gel containing cerium ammonium nitrate are added into the silica gel column, and then mixed solvents are used for column pressing; yellow oil is obtained after concentration; S4, the yellow oil is passed through a silica gel column, elution is carried out by using an eluent, and after concentration, the product 3,4-dimethyl-6-nitrophenol is obtained. The synthesis method of 3,4-dimethyl-6-nitrophenol improves the reaction yield, reduces the cost, and is green and environment-friendly.

The invention relates to the technical field of composite materials, in particular to a carbon fiber composite material bridge. The hard-soft modified spiral carbon fiber composite material is prepared from the following raw materials in parts by weight: 70 to 75 parts of bisphenol A epoxy resin, 15 to 25 parts of diethylenetriamine curing agent, 12 to 15 parts of hard-soft modified spiral carbon fiber, 6 to 8 parts of uvioresistant mixed powder, 3 to 5 parts of organic pigment dispersing agent and 5 to 7 parts of organic pigment. Spiral polyacrylonitrile fibers are prepared through a rope winding effect, then surface modification, high-temperature calcination and fulvic acid solution vacuum impregnation are conducted on tetrabutyl titanate and ammonium ceric nitrate, rigid-flexible modified spiral carbon fibers are prepared, the rigid-flexible modified spiral carbon fibers are added into a resin matrix to form a stress buffer layer, stress concentration is effectively relieved, meanwhile, a large number of hydrogen bonds and hydroxyl bonds are introduced, and the tensile strength of the composite material is improved. The bonding force between the fiber and a resin matrix is enhanced, meanwhile, strong locking can be formed between the spiral shape of the fiber and the matrix, the bending strength, the tensile strength and the impact strength of the carbon fiber composite material are greatly improved, and the mechanical property of the bridge is improved.

The present invention discloses a concrete surface curing material and a preparation method thereof. The concrete surface curing material comprises the following components: 40% to 50% of a biological raw material containing active hydroxyl groups, 0.1% to 1% of ammonium persulfate, 0.05% to 0.1% of ceric ammonium nitrate, 10% to 20% of acrylamide, 5% to 10% of 2-acrylamido-2-methyl-1-propanesulfonic acid, 1% to 5% of N,N-methylenebisacrylamide, 1% to 5% of a pH regulator, and 1% to 10% of a polyether polyol. The concrete surface curing material uses active biomass as a raw material and prepares a cross-linked polymer through a free radical initiation reaction. The cross-linked polymer can quickly form a dense polymer film on the concrete surface, inhibiting water evaporation from the concrete surface, and achieving a water retention rate of over 90%. At the same time, the raw materials used in the product are free of organic residue and volatility, are environmentally friendly, and meet the national low-carbon and environmental protection policy requirements.

The invention discloses a copper-titanium etching solution, and relates to the technical field of microelectronic device manufacturing, and the copper-titanium etching solution comprises the following components by mass: 4.5-8.5% of ammonium persulfate; 1.5%-3.5% of urea peroxide; 1.0% to 2.0% of 1-hydroxybenzotriazole-5-carboxylic acid; 0.3% to 0.9% of 2-mercapto benzimidazole; 0.5% to 1.5% of sulfobutyl ether-beta-cyclodextrin; 0.8%-2.2% of L-aspartic acid-N, N-diacetic acid; 0.1% to 0.7% of iso-tridecanol polyoxyethylene ether; 0.05%-0.15% of ceric ammonium nitrate; 0.02% to 0.08% of sodium polyacrylate; and the balance of deionized water. According to the method, the matching problem of the etching rate is solved, the stability is improved, and substrate corrosion is avoided.

The invention discloses the preparation of a flexible conductive high-temperature resistant hydrogel and its application in a flexible zinc-ion battery. The preparation method comprises the following steps: reacting graphene oxide, ammonium cerium nitrate and NIPAM monomer to obtain GO-g-PNIPAM; then reacting P(VDF-TrFE-CTFE), Zn(OTF)2 and GO-g-PNIPAM to obtain a P(VDF-TrFE-CTFE) / GO-g-PNIPAM flexible conductive high-temperature resistant hydrogel. In the invention, grafting graphene oxide with N-isopropylacrylamide (PNIPAM) can improve the structural stability of PNIPAM and enhance the mechanical properties of the hydrogel. At the same time, the added P(VDF-TrFE-CTFE) can improve the conductivity of the hydrogel. The prepared hydrogel has good mechanical properties and high-temperature resistance and can be used in the aspect of flexible zinc-ion batteries.

The invention provides a preparation method and application of a mesoporous material Ce / Ti-UiO-66-NH2, and the preparation method comprises the following steps: 1) mixing a certain amount of template agent, ceric ammonium nitrate, terephthalic acid, TMB, acetic acid and sodium perchlorate, dissolving in deionized water, and reacting to obtain Ce-UiO-66; (2) adding a certain amount of tetrabutyl titanate into a N, N-dimethylformamide solution containing Ce-UiO-66, and carrying out hydrothermal reaction, so as to obtain a Ce / Ti-UiO-66 solid; and (3) carrying out ultrasonic treatment on a certain amount of 2-aminoterephthalic acid and the Ce / Ti-UiO-66 solid in a methanol solution to obtain a Ce / Ti-UiO-66-NH2 solid. According to the method, simple and convenient synthesis of mesoporous Ce-UiO-66 can be achieved, the problem that in the prior art, a mesoporous Ce-UiO-66 synthesis method is difficult is solved, the metal titanium ion-doped and amino-loaded Ce / Ti-UiO-66-NH2 mesoporous material is prepared, and meanwhile, a new material is provided for the fields of photocatalysis and the like.

A preparation method of a rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF comprises the following steps: mixing and dissolving samarium nitrate hexahydrate and H4TBAPy in a composite solvent to form a mixed solution, carrying out a hydrothermal reaction to obtain Sm-MOF, mixing and dissolving ceric ammonium nitrate and Sm-MOF in an aqueous solution of gamma-valerolactone, then adding H2O2 and triethanolamine to form a mixed solution, carrying out magnetic stirring at 45-55 DEG C for 2-3 h, and carrying out hydrothermal reaction to obtain the rare earth-containing heterojunction catalyst material CeO2 / Sm-MOF. And then carrying out hydrothermal reaction and roasting treatment. The thermal stability of Sm-MOF is improved, ceric ammonium nitrate is adopted as a Ce source, a two-step heat treatment process is combined, the binding force and distribution uniformity of CeO2 on the surface of Sm-MOF are effectively improved, the catalytic activity and cycle stability of CeO2 / Sm-MOF are improved, and the Sm-MOF / CeO2 composite material has excellent degradation efficiency on MB, RhB, ATZ, CIP and the like and has excellent cycle stability in the cycle process.

The present invention discloses a cerium-based metal-organic framework material containing defective sites, its preparation method, and application, and belongs to the field of phosphorus adsorption materials. The preparation method of the cerium-based metal-organic framework material containing defective sites of the present invention comprises the following steps: dissolving ammonium cerium nitrate and terephthalic acid in water and an organic solvent, respectively, and then mixing them, then mixing them with a monocarboxylic acid, and performing a solvothermal reaction to obtain the cerium-based metal-organic framework material containing defective sites. The preparation method of the present invention is simple and low-cost; the prepared cerium-based metal-organic framework material containing defective sites has the advantages of large phosphorus adsorption capacity, fast adsorption rate, high selectivity, and a wide pH range of application.

The invention discloses a modified metal organic framework material and a preparation method thereof, and belongs to the technical field of metal organic framework materials.The preparation method comprises the steps that zirconium nitrate pentahydrate is dissolved in water to prepare a zirconium nitrate solution, ceric ammonium nitrate is dissolved in water to prepare a ceric ammonium nitrate solution, and the ceric ammonium nitrate solution is dissolved in water to prepare the modified metal organic framework material; uniformly mixing the zirconium nitrate solution and the ammonium ceric nitrate solution in proportion to obtain a metal solution; the preparation method comprises the following steps: adding 1, 4-terephthalic acid serving as an organic ligand into DMF (Dimethyl Formamide), and uniformly mixing to obtain a ligand solution; the preparation method comprises the following steps: adding benzoic acid into a metal solution, stirring for 0.7-1h at 200-250r / min in a microwave-assisted manner, adding a ligand solution, carrying out a synthetic reaction for 10-13min at 95-98 DEG C, and washing and drying to obtain the modified metal organic framework material. The modified metal organic framework material prepared by the invention improves the degradation capacity of tetracycline in wastewater, and effectively shortens the synthesis time. When the dosage is 0.5 g / L, the appropriate concentration of tetracycline (TC) in the degraded wastewater is 19-22 ppm, and the TC degradation rate is higher than 92%.

The invention discloses preparation of an ultrafast uranyl response AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode and uranyl detection application of the ultrafast uranyl response AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode. The method comprises the steps that oily carbon cloth is subjected to plasma cleaning and then soaked with a mixed solution of ceric ammonium nitrate, water and nitric acid; then soaking in a mixed solution of acrylic acid, acrylonitrile and DMF (Dimethyl Formamide), and heating in a water bath; after being taken out, the polymer coating carbon cloth is added into a mixed solution of hydroxylamine hydrochloride, isopropanol and sodium hydroxide, water bath heating is conducted again, and the polymer coating carbon cloth is obtained. The preparation method comprises the following steps: magnetically stirring and heating PVP-containing propylene glycol in a water bath, quickly adding NaCl, continuously stirring, adding an AgNO3 solution, and magnetically stirring and heating; and collecting the precipitate, and washing with acetone and ethanol respectively to obtain gray AgNWs. The preparation method comprises the following steps: adding 2-methylimidazole and AgNWs into an organic solvent solution containing organic amine to obtain an AgNWs composite solution; wherein in the aqueous solution of the organic amine or the organic solvent solution, the concentration of the organic amine is 8-9%; and mixing organic solvents containing cadmium salt and zinc salt to obtain the zinc-cadmium composite solution. The AgNWs composite solution and the zinc-cadmium composite solution are respectively heated and coated on polymer coating carbon cloth, then the polymer coating carbon cloth is put into an organic solvent containing thiourea, after the mixture is heated in a water bath, vacuum drying is carried out, and the AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode is obtained. According to the invention, the polymer coating carbon cloth is used as a substrate to prepare the AgNWs (at) CZS (at) CdZn-ZIF8 flexible photoelectrode, and the flexible photoelectrode has ultrafast uranyl response capability.

The invention belongs to the technical field of composite material preparation, and particularly relates to metal organic silicon heat-resistant resin, a preparation method thereof and application of the metal organic silicon heat-resistant resin in silicone rubber. Comprising the following steps: (1) adding diphenyl (3-(triethoxysilyl) propyl) phosphine and methyltriethoxysilane into ethanol, and heating to obtain a mixed solution; and (2) dropwise adding an aqueous solution containing ceric ammonium nitrate, phosphoric acid and (2-ethylhexyl) phosphoric acid mono-2-ethylhexyl ester into the mixed solution obtained in the step (1), reacting, and removing low-pressure to obtain the product. The silicon resin which is doped with high-valence cerium ions and contains a phenyl structure and a phosphorus element is used as a heat-resistant agent of the silicon rubber, so that the compatibility with the silicon rubber is improved, the dispersity is enhanced, and the heat resistance is further improved.

The invention discloses a preparation method of a medical intermediate 6-methoxy-1-tetralone, which comprises the following steps: S1, carrying out hydrogenation reduction on 2-naphthol under the action of a catalyst and a promoter to prepare 5, 6, 7, 8-tetrahydro-2-naphthol; s2, 5, 6, 7, 8-tetrahydro-2-naphthol and an oxidizing agent X are subjected to a reaction, and 6-hydroxy-3, 4-dihydronaphthalene-1-one is prepared; s3, enabling the 6-hydroxyl-3, 4-dihydronaphthalene-1-ketone to react with a methylation reagent in an alkaline environment, so as to prepare 6-methoxyl-1-tetralone, and enabling the 6-hydroxyl-3, 4-dihydronaphthalene-1-ketone to react with a methylation reagent in an alkaline environment; wherein the oxidizing agent X comprises at least one of oxygen, hydrogen peroxide, tert-butyl hydroperoxide, potassium permanganate, tetrabutylammonium perchlorate, pyridine chlorochromate, 2, 3-dichloro-5, 6-dicyanobenzoquinone, chromium trioxide, ceric ammonium nitrate, potassium persulfate, 1, 4-benzoquinone and chloranil; the feeding molar ratio of the oxidizing agent X to the 5, 6, 7, 8-tetrahydro-2-naphthol is (1.0 to 2.5): 1.0. The method has the advantages of mild reaction conditions, high molar total yield, high purity, low cost and toxicity of raw materials, less discharge of three wastes, and clean process, and is suitable for industrial production.

The application provides a preparation method of a heat insulation tile composite aerogel material, and belongs to the technical field of heat insulation tiles; the preparation method comprises the steps of preparing silane-treated basalt fibers, preparing modified silicon carbide and compounding and forming; in the step of preparing the silane-treated basalt fibers, the basalt fibers are placed in a pretreatment solution, kept at 74-77 DEG C for 1.4-1.6 h, then put into a cerium ammonium nitrate solution, immersed at 56-60 DEG C for 36-45 min, and then the immersed basalt fibers are obtained; the immersed basalt fibers are put into an ethanol solution, gamma-mercaptopropyltrimethoxysilane is added, and stirring is carried out at 70-75 DEG C for 3.0-4.0 h, and then the silane-treated basalt fibers are obtained; the heat insulation tile composite aerogel material prepared by the preparation method has good heat insulation performance and mechanical strength, good high-temperature resistance and excellent stability in a complex environment.

The application provides a low-acidity-high-stability etching solution and an etching method. In the cerium ammonium nitrate etching system, the low-acidity glacial acetic acid is used in the application, and the etching rate is still stable under the low-acidity condition, the etching effect is equivalent to or even better than that of the traditional high-acidity etching solution, and the disadvantages caused by the high acidity in the prior art are overcome.

The present invention belongs to the field of chemical engineering and discloses a method for preparing a novel covalent organic framework photoelectrocatalyst and the photoelectrocatalyst thereof. The method comprises reacting bromophenylporphyrin with phenylboronic acid to obtain an aldehyde group, thereby obtaining biphenylporphyrin (PP). Triphenylene (TC) reacts with ammonium cerium nitrate under a palladium-carbon catalyst to obtain an amino group, thereby obtaining diaminotriptycene (TAT). Under acidic conditions, the aldehyde group of the biphenylporphyrin (PP) and the amino group of the diaminotriptycene (TAT) react with each other to form a -C=N- bond, forming a stable Schiff base structure. This novel covalent organic framework photoelectrocatalyst can photoelectrocatalyze the production of urea from CO2 and nitrite, and exhibits advantages such as physical and chemical stability, good dispersibility, minimal environmental impact, and low cost.

The invention provides a method for circularly leaching uranium from cerium oxide through electrochemical catalysis, which belongs to the technical field of uranium mining and metallurgy and comprises the following steps: preparing a leaching solution containing ceric ammonium nitrate and sulfuric acid; adding the crushed uranium ore into the leaching solution, and leaching to obtain a leaching solution; adsorbing the leachate by using an ion exchange resin column; eluting the adsorbed ion exchange resin column to obtain uranium-containing eluent; precipitating, filtering and drying the uranium-containing eluent to obtain a uranium compound product; and adsorbing tail liquid obtained after leach liquor passes through an ion exchange resin column is electrolyzed to oxidize and regenerate Ce (III) into Ce (IV) for recycling. The method for cyclically leaching uranium through electrochemical catalysis of cerium oxide is efficient, environmentally friendly, sustainable, economical and feasible.

The present invention discloses a preparation method of a dual-mode sensor for detecting hydrogen sulfide based on fluorescent nanometal organic framework materials. The method adopts a solvothermal method, wherein metal ions or clusters and organic ligands are mixed in a high-boiling-point solvent and reacted to generate MOF under high temperature conditions. The solid polymer synthesized by this method is composed of the metal ion ammonium cerium nitrate and the organic ligand 2-hydroxyterephthalic acid. The sensor is composed of Ce-MOF, 3,3',5,5'-tetramethylbenzidine (TMB) and H2O2 to form a colorimetric and fluorescent dual-response sensor. Based on ultraviolet absorption and fluorescence intensity, H2S is accurately detected. The detection range of the sensor colorimetric response is 200-2300μM, with a detection limit of 0.262μM, and the detection range of the fluorescence response is 16-320μM, with a detection limit of 0.156μM, achieving more accurate detection of H2S and meeting the detection requirements of food freshness and safety.