145 results about "Hydroquinone Compound" patented technology

The invention discloses preparation of a bionic copper-based MOF nano-enzyme and application of the bionic copper-based MOF nano-enzyme in hydroquinone detection, and the bionic copper-based MOF nano-enzyme is prepared by the following method: dissolving terephthalic acid H2BDC and L-histidine His in N, N-dimethylformamide DMF to obtain a solution A; adding copper chloride CuCl2. 2H2O into the solution A obtained by C1, and stirring to form a uniform mixed solution; carrying out hydrothermal reaction on the mixed solution obtained from C2 for a certain time, centrifuging to obtain a solid precipitate, cleaning the solid precipitate, and drying to obtain the bionic Cu / His-MOF nano-enzyme; the invention also discloses an application of the sensor in hydroquinone detection. The bionic copper-based MOF nano-enzyme has the advantages of being simple and convenient to synthesize, high in substrate affinity, high in catalytic capacity and the like, and meanwhile, a rapid, sensitive and reliable HQ detection method is provided.

The invention discloses a preparation method of 4-(acetoxy) phenyl-2-methyl-2-acrylate, which takes mild DMAP as a reaction catalyst, produced phenolic ester is not easy to hydrolyze due to weak alkalinity, and the dripping speed and the reaction temperature are controlled at the same time, so that simultaneous esterification of two hydroxyls of hydroquinone can be effectively avoided, and the yield of 4-(acetoxy) phenyl-2-methyl-2-acrylate is improved. And generation of by-products can be reduced. According to the method, the ethyl acetate and petroleum ether mixed solvent with the ratio of 1: 2 is adopted for recrystallization, hot filtration operation is carried out, insoluble substances are by-products, solids separated out after filtrate is cooled are target products, operation is simple, high-yield target product powder solids can be directly obtained, and the purity can reach 80% or above. The method is simple and rapid in process, short in production period, low in production cost, high in total yield of target products and suitable for industrial production.

The invention belongs to the technical field of polymer chemical production, and discloses a method for continuously and efficiently preparing polyether-ether-ketone. The method comprises the following steps: dissolving 4, 4 '-difluorobenzophenone and diphenyl sulfone in a first dissolving tank to obtain a 4, 4'-difluorobenzophenone solution; hydroquinone, a catalyst and diphenyl sulfone are placed in a second dissolving tank to be dissolved, and a hydroquinone solution is obtained; the preparation method comprises the following steps: injecting a 4, 4 '-difluorobenzophenone solution and a hydroquinone solution into a reactor for polymerization reaction to obtain a mixed solution; injecting the mixed solution into a separator through a heat exchanger for separation to obtain polyether-ether-ketone and liquid; distilling the liquid to obtain diphenyl sulfone and sodium fluoride, and returning the obtained diphenyl sulfone to participate in dissolution; all the steps are carried out in a protective atmosphere. The preparation process provided by the invention is a brand new PEEK production process flow, and realizes continuous PEEK production and efficient energy recycling.

The invention relates to the technical field of composite materials, in particular to a polyaryletherketone-based shape memory composite material and a preparation method thereof. Comprising a terpolymer, shape memory polyurethane, a first heat-conducting filler and a second heat-conducting filler, 4, 4 '-difluorobenzophenone and hydroquinone are firstly pre-polymerized to obtain a PEEK prepolymer, the PEEK prepolymer is terminated by a hydroxyl olefine acid ester monomer to obtain a terminated copolymer, and then an acrylate monomer and the terminated copolymer are subjected to double-bond addition to obtain the terpolymer; the first heat-conducting filler is a one-dimensional nano heat-conducting filler; the second heat-conducting filler is a zero-dimensional and / or two-dimensional heat-conducting substance; the prepared composite material has the shape fixing rate of 85% or above and the shape recovery rate of 87% or above, the recovery time is shorter than 25 seconds, and the good shape memory performance is achieved.

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyolefin composite material as well as a preparation method and application thereof. The polyolefin composite material is prepared from the following raw materials: polyethylene, a polyolefin toughening agent, a compound flame retardant and a filler, the melt index of the polyethylene at 190 DEG C / 2.16 kg is greater than or equal to 18 g / 10 min, and the bending modulus is less than or equal to 160 MPa; the polyolefin toughening agent is selected from at least one of an ethylene-propylene copolymer, an ethylene-butylene copolymer and an ethylene-vinyl acetate copolymer, and the melt index at 230 DEG C / 2.16 kg is greater than or equal to 9 g / 10 min; the compound flame retardant comprises tetrabromobisphenol S bis (2, 3-dibromopropyl) ether, antimony trioxide and hydroquinone bis (diphenyl phosphate), and the filler is at least one of talcum powder, barium sulfate and wollastonite. Through specific types of polyethylene, the polyolefin flexibilizer, the compound flame retardant and the filler, excellent flame retardance and toughness can be obtained.

The invention provides a multi-walled carbon nanotube paste electrode based on gold nanoparticles and C60 modification as well as a preparation method and application thereof, and belongs to the technical field of electrochemical sensors. The preparation method comprises the following steps: firstly, modifying fullerene C60 on the surface of a carbon nanotube paste electrode (MWCNTPE) to form C60 / MWCNTPE, then loading gold nanoparticles on the surface of the C60 / MWCNTPE, and finally constructing the AuNPs / C60 / MWCNTPE composite electrode. The prepared composite electrode is used for environmental estrogen detection, especially for simultaneous detection of hydroquinone, catechol and bisphenol A. The method has the advantages of high sensitivity and low detection limit, can solve the problem that hydroquinone and catechol isomeride are difficult to separate through the detection capability, has the advantages of simplicity and convenience in operation and low cost, and has good practical applicability, stability and reproducibility.

The invention relates to the field of anti-aging agents DTPD, and particularly discloses a preparation method of the anti-aging agent DTPD. The preparation method of the anti-aging agent DTPD comprises the following steps: mixing aniline and o-toluidine, stirring, heating to 50-60 DEG C, adding hydroquinone and a catalyst, carrying out condensation reaction at 100-250 DEG C, removing evaporated water in the reaction process, and stopping the reaction until water cannot be evaporated; cooling to 100-140 DEG C, filtering while the mixture is hot, and distilling to remove impurities, so as to obtain the anti-aging agent DTPD; the catalyst is selected from one or more of benzene sulfonic acid, benzene disulfonic acid, p-toluenesulfonic acid, p-aminobenzene sulfonic acid, aniline trisulfonic acid and sulfonated halloysite. The preparation method disclosed by the invention has the advantages of high content of effective components in the product, simplicity and convenience in operation and safety.

The invention relates to the technical field of electrochemical analysis and detection, in particular to a sensitive detection tert-butylhydroquinone modified glassy carbon electrode, a preparation method and application, the sensitive detection tert-butylhydroquinone modified glassy carbon electrode has high specific surface area and catalytic activity and good conductivity, sensitive detection of tert-butylhydroquinone can be achieved, and the application range is wide. The modified glassy carbon electrode comprises a glassy carbon electrode and a compound coating, the compound coating wraps the surface of the glassy carbon electrode, and the compound coating is composed of graphene oxide and a Ti-based MOF derivative; the preparation method comprises the following steps: (1) preparing MIL-125 (Ti); (2) preparation of TiO2 / NC; (3) preparation of 15% GO (at) TiO2 / NC; (4) preparing a dispersion liquid of the prepared 15% GO-coated TiO2 / NC composite material; (5) manufacturing a modified electrode; the application comprises the following steps: S1, establishing a concentration-electrochemical response signal relationship; and S2, measuring the concentration of the to-be-measured substance.

The invention belongs to the field of rubber additives, and particularly relates to an anti-aging agent as well as a synthesis method and application thereof. RT base and a phenol compound are used as raw materials for synthesis under the action of a catalyst; the phenol compound is a mixture of phenol and o-methylphenol. According to the invention, RT base (p-aminodiphenylamine) is used as a precursor and reacts with phenol or o-methylphenol in the presence of a catalyst to produce the anti-aging agent. Salt-containing waste water is not generated in the precursor production process, and compared with hydroquinone serving as a precursor, the precursor has the obvious cost advantage and the environment-friendly advantage.

The invention discloses a preparation process of polyether-ether-ketone, and relates to the technical field of preparation of inorganic compounds. The preparation process comprises the following steps: reacting 4, 4 '-difluorobenzophenone, sodium carbonate and hydroquinone to generate polyether-ether-ketone, taking a polyaryletherketone block oligomer as an end-capping reagent, reacting 4, 4'-difluorobenzophenone with 4, 4 '-dimercaptodiphenyl sulfone, and then reacting with pentaerythritol phosphate to obtain the polyaryletherketone block oligomer. The thioester bond reversibly breaks at the polymerization temperature, exposed active sulfenyl reacts with hydroxyl at the tail end of the polyether-ether-ketone to form a more stable covalent bond, volatilization of the end-capping reagent is avoided, meanwhile, the initial decomposition temperature of the end-capped polyether-ether-ketone is increased, and the stability of the end-capping reagent is improved. The polyether-ether-ketone generated in the polyether-ether-ketone resin product is subjected to treatment procedures of crushing, organic solvent extraction, water washing, filtering, drying and the like, so that the product polyether-ether-ketone is obtained, less three wastes are generated, the solvent can be recycled, the atom economy is relatively high, and the preparation process of comprehensive utilization of resources is realized.

The invention discloses a sodium-ion battery electrolyte and a preparation method thereof, and relates to the technical field of sodium-ion batteries, the electrolyte comprises a sodium salt, a composite solvent, an additive and an auxiliary agent, the sodium salt is formed by compounding sodium bis (fluorosulfonyl) imide, sodium bis (trifluoromethanesulfonyl) imide and modified sodium bis (oxalato) borate, and the composite solvent is formed by compounding sulfolane, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol, 1, 3-butanediol and 1, 3-butanediol. The auxiliary agent is nano-scale ZIF-8, the additive is 1, 3-propylene glycol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, the additive is modified 1, 3-propane sultone, trimethyl phosphate and hydroquinone dimethyl ether, and the auxiliary agent is nano-scale ZIF-8. According to the electrolyte, sodium bis (oxalato) borate is modified after being treated by hydrogen peroxide and has efficient hydrofluoric acid resistance, meanwhile, hydrofluoric acid generated by the reaction of fluorine-containing sodium salt and water in the electrolyte can be specifically removed by utilizing an auxiliary agent of the nano ZIF-8 and a synergistic effect formed by the sodium salt and the auxiliary agent, and damage of the hydrofluoric acid to a negative electrode SEI film is avoided; and the cycle life of the sodium ion battery is prolonged.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of an olefin monomer of benzocrown ether imidazole polymerized ionic liquid. Comprising the following steps: adding benzo-12-crown-4-ether, iodo-alkyl acid and polyphosphoric acid into a heat preservation kettle, carrying out heating reaction, adding chloro-alkyl acid, carrying out heating reaction, dropwise adding water to hydrolyze residual polyphosphoric acid, extracting an organic phase by chloroform, washing chloro-alkyl acid by using a sodium carbonate aqueous solution, drying, carrying out suction filtration, and transferring into a reaction kettle; adding 1-methylimidazole, carrying out heating reaction, carrying out rotary evaporation to obtain chloroform, adding dioxane, triethylamine and hydroquinone, carrying out heating reaction, and carrying out rotary evaporation to obtain dioxane; the ionic liquid, organic salt and pure water are added into a dissolving kettle, dichloromethane is used for extracting an organic phase, pure water is used for washing chloride ions and iodide ions in the organic phase, dichloromethane is obtained through rotary evaporation, and a product is dried in vacuum. According to the method, the steps of acylation, quaternization and dehydrohalogenation are used, so that the steps are simplified, and the purification treatment process of acylation after quaternization is avoided.

The invention relates to the technical field of high-molecular polymers and surface chemical modification thereof, in particular to a low-dielectric-constant polyaryletherketone material and a preparation method thereof, and a flexible copper foil laminated structure and a preparation method thereof. The low-dielectric-constant polyaryletherketone material is obtained by taking a bisphenol monomer and difluorobenzophenone as reaction monomers and carrying out aromatic nucleophilic polycondensation reaction; wherein the bisphenol monomer is selected from a combination of C3-C8 normal or isomeric alkyl substituted hydroquinone and bisphenol containing at least one aryl group; the bisphenol containing at least one aryl group is selected from one or more of bisphenol AP, bisphenol BP, bisphenol Z and bisphenol fluorene; the low-dielectric-constant polyaryletherketone material forms a thin film, the surfactant treatment layer and the grafting layer are sequentially formed on the thin film, then the thin film is compounded with the copper foil, and the formed flexible copper foil laminated structure has high peel strength and low dielectric constant.

The application discloses a buried bottom interface reinforced large-area perovskite battery module and a preparation method thereof, and relates to the field of solar cells. The buried bottom interface of the large-area perovskite battery module is composed of a hole transport layer, an interface reinforcing layer and a self-assembled monolayer, wherein the interface reinforcing layer is an interface regulating layer of a potassium hydroquinone sulfate coordination structure, the interface regulating layer is coordinated with metal ions on the surface of a metal oxide through phenolic hydroxyl groups and is passivated, and sulfate groups anchor under-coordinated lead ions, so as to form a dual-functional buried bottom interface coupling structure. The high oxidation state defects on the surface of the magnetron sputtering NiOx film are passivated through the potassium hydroquinone sulfate interface reinforcing layer, the combination between the NiOx and the SAM is enhanced, and the stability of the large-area perovskite battery is improved.

The invention provides spherical lignin-phenolic resin, a preparation method thereof and application of the spherical lignin-phenolic resin in adsorption of N-containing organic dye, and belongs to the technical field of adsorption materials. The lignin-phenolic resin with the regular spherical morphology can be prepared through a one-step condensation polymerization reaction by taking lignin, hydroquinone and trioxymethylene as raw materials under an acidic catalysis condition and adopting a reversed-phase suspension polymerization method, the lignin belongs to a renewable resource and has the characteristics of low cost and environmental friendliness, and the lignin-phenolic resin can be used for preparing the lignin-phenolic resin with the regular spherical morphology. The phenolic resin can replace phenols to become a main phenol source, the substitution rate can reach 75%, and the yield of the synthesized phenolic resin reaches up to 60-80%. Besides, abundant phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups can be introduced into the resin by selecting the types of monomers, the cross-linked structure of the resin is changed by regulating and controlling the proportion of the monomers, the adsorption capacity of N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be achieved.

The preparation method comprises the following steps: immobilizing a specific capture antibody Ab1 of a carcino-embryonic antigen on the surface of a gold electrode, closing a non-specific site by bovine serum albumin to obtain a BSA / Ab1 / GE working electrode, capturing the carcino-embryonic antigen, fusing the carcino-embryonic antigen with an enzyme-coated HHOF-Ab2 nano probe, and detecting the enzyme-coated HHOF-Ab2 nano probe to obtain the sandwich type electrochemical immunosensor based on the enzyme-coated hydrogen bond organic framework hybrid catalyst. The enzyme coated HOF-based sandwich type electrochemical immunosensor is obtained; the sensor specifically recognizes CEA through 'Ab1-CEA-Ab2' double antibody sandwich, the cyclic reaction of H2O2 and HQ is catalyzed by virtue of the enzyme-coated HOF nanoprobe to amplify a signal, and finally chemical change caused by oxidizing hydroquinone into benzoquinone is converted into quantifiable current by virtue of an electrochemical workstation, so that ultra-sensitive detection of CEA is realized, and the sensor has the advantages of high sensitivity, high response speed, strong specificity and the like.

The application discloses a kind of sodium ion battery electrolyte and preparation method thereof, it is related to sodium ion battery technical field, the electrolyte includes: sodium salt, composite solvent, additive and auxiliary agent, the sodium salt is sodium difluorosulfurylimide, sodium bis-trifluoromethanesulfonimide and modified sodium borate dihydroxide dioxalate compound composition, composite solvent is sulfolane-1,3-propanediol dimethyl ether, dimethyl carbonate, fluoroethylene carbonate and ethyl acetate, additive is modified 1,3-propane sulfone lactone, trimethyl phosphate and hydroquinone dimethyl ether, auxiliary agent is nano ZIF-8.This electrolyte sodium borate dihydroxide dioxalate is modified after hydrogen peroxide treatment, with high-efficiency anti-hydrofluoric acid capacity, while using the auxiliary agent of nano ZIF-8, sodium salt and auxiliary agent form synergistic effect can be targeted to remove hydrogen fluoride sodium salt and moisture reaction generated in electrolyte hydrofluoric acid, avoid the damage of hydrofluoric acid to negative electrode SEI film, and then improve the cycle life of sodium ion battery.

The invention belongs to the technical field of electrolytic preparation, and discloses a method for preparing hydroquinone by taking quinone hydroquinone as a raw material through electrolytic reduction. The method comprises the following steps: adding an acidic aqueous solution into the anode chamber of the H-type electrolytic cell; adding an acidic aqueous solution, quinone-hydroquinone and a cosolvent into a cathode chamber of the H-type electrolytic cell; carrying out electrolytic reduction to obtain an electrolyte containing hydroquinone in the cathode chamber; performing extraction treatment on the electrolyte containing hydroquinone to obtain an organic phase and a water phase containing hydroquinone; and carrying out cooling crystallization treatment on the hydroquinone-containing water phase to obtain a hydroquinone product. The hydroquinone product obtained by the method is high in yield and high in purity.

The invention provides a preparation method of an isobornyl methacrylate monomer, which comprises the following steps: compounding isobornyl alcohol, methacrylic anhydride, absolute ethyl alcohol, immobilized enzyme, a 3A molecular sieve and hydroquinone to obtain a reaction solution, centrifuging, filtering, separating, and carrying out rotary evaporation to obtain the isobornyl methacrylate monomer. The isobornyl methacrylate monomer is prepared by using the immobilized enzyme as the catalyst, so that the yield of the product is improved, the immobilized enzyme can be reused, and the consumption of the catalyst is reduced; meanwhile, the enzyme can be effectively prevented from being diluted or lost in the reaction process, so that the economical efficiency of the reaction is improved; in addition, the form of the immobilized catalyst is beneficial to simplifying subsequent separation and purification steps, and is relatively environment-friendly.

The invention relates to a synthesis method of 1, 4-bis (4-aminophenoxy) benzene, and relates to the technical field of organic synthesis. The preparation method comprises the following steps: adding parachloronitrobenzene, potassium carbonate and hydroquinone into N, N-dimethylformamide and toluene, and reacting by using a water separation device; after the reaction is finished, filtering, and leaching a filter cake with ethyl acetate; adding the filter cake into water, stirring, filtering, and leaching the filter cake with ethanol; adding the filter cake into a reaction kettle, adding ethanol, pulping, filtering and drying to obtain 1, 4-bis (4-nitrophenoxy) benzene; the preparation method comprises the following steps: adding 1, 4-bis (4-nitrophenoxy) benzene, a palladium carbon catalyst and tetrahydrofuran into a high-pressure kettle for reaction to obtain crude 1, 4-bis (4-aminophenoxy) benzene; the crude 1, 4-bis (4-aminophenoxy) benzene is subjected to filtration, rotary evaporation, methanol pulping treatment, filtration and drying, and 1, 4-bis (4-aminophenoxy) benzene is obtained; the process is simple, and the yield and the purity of the 1, 4-bis (4-aminophenoxy) benzene are relatively high.

The invention relates to certain chromanol, quinone or hydroquinone compounds and derivatives thereof for treatment of Alzheimer's disease and / or for improving memory function and / or reducing plaque load. Specifically, the present invention relates to chromanol compounds chosen from (6-hydroxy-2,5,7,8-tetramethylchroman-2yl)(piperazin-1-5 yl)methanone, ((S)-6-hydroxy-2,5,7,8-tetramethyl-N-((R)-piperidin-3-yl)chroman-2- carboxamide hydrochloride and S-(6-hydroxy-2,5,7,8-tetramethylchroman-2-yl)(4-(2- hydroxyethyl)piperazin-1-yl)methanone, and pharmaceutically acceptable salts thereof.

To provide a method for preventing polymerization of a vinyl compound having high polymerizability.SOLUTION: It has been discovered that effective prevention of polymerization in a vinyl compound is achievable by incorporating, as polymerization inhibitors, 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy free radical, 1,4-dihydroxy-2,2,6,6-tetramethylpiperidine, hydroquinone, and benzoquinone into the vinyl compound.SELECTED DRAWING: None

The invention discloses an application of a noble metal-loaded solid alkali bifunctional catalyst in selective preparation of trans-1, 4-cyclohexanediol, and the noble metal-loaded solid alkali bifunctional catalyst is used for catalyzing a reaction of hydroquinone hydrogenation for high-selectivity preparation of trans-1, 4-cyclohexanediol. According to the catalyst, one of noble metals Ru, Pd and Rh is used as an active metal, and gamma-Al2O3 loaded by one of potassium salts KF, KNO3, K2CO3 and KHCO3 is used as a carrier. According to the method, hydroquinone hydrogenation reaction is catalyzed by the noble metal-loaded solid alkali bifunctional catalyst, hydrogenation and isomerization can be synchronously realized through the synergistic effect between the noble metal and the superstrong alkaline carrier, the trans-1, 4-cyclohexanediol is directly synthesized with high selectivity, the selectivity of trans-1, 4-CHD in the reacted 1, 4-cyclohexanediol product is not lower than 90%, and the selectivity of the trans-1, 4-CHD in the reacted 1, 4-cyclohexanediol product is not lower than 90%. And the method is suitable for large-scale production of the rich trans-1, 4-cyclohexanediol.

The application provides a spherical lignin-phenolic resin and a preparation method and application thereof in adsorbing N-containing organic dyes, and belongs to the technical field of adsorbing materials. The lignin-phenolic resin with regular spherical morphology is prepared by one-step condensation polymerization reaction through the reverse suspension polymerization method under acid catalysis, wherein lignin, hydroquinone and trioxane are used as raw materials. The lignin belongs to renewable resources, has the characteristics of low cost and environmental friendliness, can replace phenol as the main phenol source, and the replacement rate can reach 75%. The yield of the synthesized phenolic resin is as high as 60-80%. In addition, the monomer type can be selected to introduce rich phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups in the resin, the monomer ratio is controlled to change the crosslinking structure of the resin, the adsorption capacity of the resin for N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be realized.

The application relates to the technical field of dental biomaterials, in particular to a wear-resistant low-shrinkage dental resin composite material and a preparation method thereof, which comprises the following raw materials: bisphenol A-glycidyl methacrylate, modified black phosphorus nanosheet, modified Zr-MOF, benzoyl peroxide, silane coupling agent, camphorquinone, hydroquinone, chlorhexidine and triethylene glycol dimethacrylate. In the application, the bisphenol A-glycidyl methacrylate, the modified black phosphorus nanosheet and the modified Zr-MOF play a role through a synergistic effect. The bisphenol A-glycidyl methacrylate provides a stable carrier support for the modified black phosphorus nanosheet and the modified Zr-MOF. The modified black phosphorus nanosheet effectively reduces the friction coefficient, helps the resin matrix to maintain a better curing network structure, the modified Zr-MOF increases the rigidity and strength of the resin matrix, adsorbs free monomers in the resin matrix, delays the curing rate, reduces stress concentration, fills the shrinkage voids of the resin matrix, and ensures the long-term usability of the dental resin composite material.

The application discloses a carbon-based metal monatomic catalyst for preparing p-benzopinacol from benzene and an application thereof, and the catalyst is prepared by loading active components copper and first and second additives calcium on a carbon carrier; wherein the first additive is any one or more of iron, vanadium, titanium and manganese, the carbon carrier is mainly composed of carbon elements and simultaneously contains at least one of nitrogen and oxygen elements; and metal elements in the catalyst exist in the form of isolated monatomic atoms, so that the atomic utilization rate can be improved. The catalyst can change the path of benzene oxidation reaction, and realizes efficient conversion of benzene to p-benzopinacol. Under the condition that the molar ratio of benzene to hydrogen peroxide is 1:5, the conversion rate of benzene can reach more than 97%, and the selectivity of p-benzopinacol can reach more than 86%; under the condition that the molar ratio of benzene to hydrogen peroxide is 1:3, the conversion rate of benzene can still reach more than 80%, and the selectivity of p-benzopinacol can reach more than 84%, excellent performance is realized, the utilization rate of hydrogen peroxide is high, the catalyst preparation method is simple, the cost is low, the catalyst can be recycled, and the catalyst is suitable for mass production.

The present application relates to the technical field of electrochemical analysis detection, and particularly relates to a modified glassy carbon electrode for sensitive detection of tert-butyl hydroquinone, a preparation method and application, which has a high specific surface area and catalytic activity, and has good conductivity, and can realize sensitive detection of tert-butyl hydroquinone, the modified glassy carbon electrode comprises a glassy carbon electrode and a composite coating, the composite coating is wrapped on the surface of the glassy carbon electrode, and the composite coating is composed of graphene oxide and a Ti-based MOF derivative; the preparation method comprises the following steps: (1) preparation of MIL-125 (Ti); (2) preparation of TiO2 / NC; (3) preparation of 15% GO@TiO2 / NC; (4) preparation of a 15% GO@TiO2 / NC composite material dispersion liquid; (5) preparation of a modified electrode; and the application comprises the following steps: S1, establishing a concentration-electrochemical response signal relationship; S2, determining the concentration of a to-be-detected substance.

The invention provides an application of a phenazine derivative in detection of p-phenylenediamine. When various aromatic isomers such as o-phenylenediamine, m-phenylenediamine, p-phenylenediamine (p-PD), catechol, resorcinol, hydroquinone, phthalic acid, m-phthalic acid, terephthalic acid, o-chloroaniline, m-chloroaniline and p-chloroaniline are added into the dimethyl sulfoxide solution of the phenazine derivative (DCP), the aromatic isomers are added into the dimethyl sulfoxide solution of the phenazine derivative (DCP). Only p-PD can cause obvious fluorescence intensity enhancement and blue shift of a fluorescence emission spectrum. And the fluorescence of the phenazine derivative DCP solution is not influenced by the addition of other aromatic isomers. And good single selectivity and anti-interference capability are shown. Meanwhile, a fluorescence titration experiment shows that the concentration of p-PD and the fluorescence intensity have a very good linear relationship, and the lowest fluorescence detection limit is calculated to be 0.396 nM. A test strip is prepared from the aptamer, and is used for real-time detection of p-PD. The recognition performance has important application value in the field of aromatic isomer recognition.

This application relates to the field of materials technology, providing a chitosan-polyacrylonitrile composite material, its preparation method, and its application. The general structural formula of the chitosan-polyacrylonitrile composite material is as follows: This application uses inexpensive chitosan and polyacrylonitrile fiber as raw materials to develop a novel chitosan-polyacrylonitrile composite material, overcoming the solubility limitation of chitosan under acidic conditions and simultaneously enhancing its adsorption capacity for phenolic compounds and heavy metals. It exhibits higher selectivity for target pollutants, especially among eight different phenolic compounds (phenol, 4-methylphenol, 4-chlorophenol, 4-nitrophenol, hydroquinone, catechol, resorcinol, and phloroglucinol), showing excellent adsorption performance for hydroquinone, with an adsorption capacity as high as 316.84 mg·g⁻¹. ‑1 Furthermore, this application addresses the soft metal ion Hg. 2+ Its adsorption capacity is outstanding, with a maximum adsorption capacity of 237.18 mg·g⁻¹. ‑1 .

This invention discloses a compound additive and its application in removing corrosive sulfur from mineral insulating oil, relating to the field of insulating oil additives. It includes a first inhibitor, a second inhibitor, a first antioxidant, and a second antioxidant. The first inhibitor is a benzotriazole derivative, and the second inhibitor is a thiadiazole derivative and / or methylbenzotriazole. The first antioxidant is pyrogallol, and the second antioxidant is butylated hydroxytoluene and / or tert-butylhydroquinone. This additive uses a compound inhibitor and a compound antioxidant. When applied to mineral insulating oil, the synergistic effect of the compound inhibitor improves the insulating oil's resistance to corrosive sulfur. Simultaneously, the compound antioxidant and compound inhibitor are balanced to maximize the insulating oil's oxidation resistance, providing continuous and efficient protection for mineral insulating oil in actual operation, resulting in excellent physical and electrical properties.