839 results about "O-Phenylenediamine" patented technology

The present invention is directed to lubricating oils exhibiting improved resistance to oxidation and deposit / sludge formation comprising a lubricant base oil and catalytic antioxidants comprising an effective amount of a) one or more polymetal organometallic compound; and, b) effective amounts of one or more substituted N,N′-diaryl-o-phenylenediamine compounds or c) one or more hindered phenol compounds or both, to a method for improving the antioxidancy and the resistance to deposit / sludge formation of formulated lubricating oil compositions by the addition thereto of an effective amount of the aforementioned catalytic antioxidants, and to an additive concentrate containing the aforementioned catalytic antioxidants.

The invention relates to a method for simulating peroxidase by manganese dioxide nanosheet for detection of reductive biological molecules. The peroxidase simulated by manganese dioxide nanosheet can perform catalytic oxidation on substrates of 3,3',5,5'-tetramethyl benzidine TMB, 2,2-azino-di(3-ethyl-benzothiazoles-6-sulfonic acid) diammonium salt ABTS and o-phenylenediamine OPD, and changes the color from colorless to blue, green and orange respectively, at the same time, the manganese dioxide nanosheet can sensitively and selectively perform an oxidation reduction reaction with reductive biological molecules such as glutathione and ascorbic acid, oxidation product concentration of the substrates such as TMB, ABTS and OPD is changed, and then, the reductive biological molecules such as glutathione and ascorbic acid are subjected to quantitative determination through a colorimetric analysis method. The method has the characteristics of simple operation, high sensitivity, good reappearance and high selectivity; a detection linear scope of glutathione is 1-15 [mu]M, the detection limit is 0.3 [mu]M; the detection linear scope of ascorbic acid is 3-100 [mu]M, the detection limit is 0.8 [mu]M; and the method can be used for detecting various phenolic compounds.

The invention discloses a method for preparing o-phenylenediamine by catalytic hydrogenation of o-nitrophenylamine. The method is characterized in that: in the hydrogenation reaction of o-nitrophenylamine, alcohol is used as a solvent, nickel is used as a catalyst, reduction reaction is performed for 2 to 10 hours under the hydrogen pressure of 1.0 to 6 MPa at the temperature of between 40 and 80 DEG C, and the reaction product is rectified to form the while o-phenylenediamine. The method has the advantages that the alcohol is used as the solvent in the catalytic hydrogenation for producing o-phenylenediamine, the alcohol can be reclaimed and directly used for next reaction, and the waste residue produced by distillation can be used as an organic fuel, so that the problem that a large amount of waste water containing organic substances is produced in reduction of iron powder or sodium sulfide in the conventional process is solved; and thick acid and thick alkali used in the conventional process are avoided in the hydrogenation process, so that corrosion of equipment is greatly reduced, pollution is reduced, and almost zero pollution is realized. In addition, compared with the conventional iron powder or sodium sulfide reduction, the catalytic hydrogenation process has the advantages of low pollution, high yield, high quality, short production period and low energy consumption.

The invention discloses a composite nanofiltration membrane based on a hydrophilic modified polyolefin microporous substrate and a preparation method thereof. The composite nanofiltration membrane comprises a substrate and a selective cortex formed on the substrate through an interfacial polymerization reaction, and the substrate is a polyolefin microporous membrane subjected to hydrophilic modification through sedimentation; the selective cortex is formed by the interfacial polymerization reaction of an aqueous phase monomer and an oil phase monomer on the surface of the substrate; the aqueous phase monomer is at least one of piperazine, m-phenylenediamine and o-phenylenediamine; and the oil phase monomer is trimesoyl chloride. The substrate of the composite nanofiltration membrane is the polyolefin microporous membrane subjected to the hydrophilic modification through the sedimentation, a formed hydrophilic layer is thin and uniform, the surface topography of the substrate is unchanged, and the selective cortex formed on the hydrophilic layer through the interfacial polymerization is dense, uniform and defect-free, so that water flux of the composite nanofiltration membrane is large; the polyolefin microporous substrate has good tolerance for organic solvents, so that the use range of the composite nanofiltration membrane is improved.

New compounds represented by the formula or pharmaceutically acceptable salts or prodrugs thereof,whereinX1 and X2 are each independently selected from a CH group or a nitrogen atom; andR is an optionally substituted five or six membered nonaromatic carbocyclic ring or a nonaromatic or aromatic heterocyclic ring, whereby the ring is optionally condensed with a 6-membered, optionally substituted carbocyclic aromatic ring.

The invention discloses a method for quantitative detection of biological molecules capable of being metabolized to generate H2O2 in serum by means of a ratiometric fluorescent probe. The method includes firstly preparing copper-nitrogen codoped carbon dots Cu-CDs; then reacting corresponding oxidase and the biological molecules capable of being metabolized to generate H2O2 to generate H2O2; catalyzing the H2O2 and a substrate that is o-phenylenediamine with horseradish peroxidase to generate an oxidation product DAP having yellow fluorescence; then adding the Cu-CDs into the DAP; allowing the DAP and the Cu-CDs to form ratiometric fluorescence, with the ratio I<572> / I<460> of fluorescence intensities of the DAP and the Cu-CDs being in a linear relationship with the concentration of a substance to be detected; and performing quantitative assay of the biological molecules in the serum according to the ratio of fluorescence intensities. The method is high in sensitivity and simple and convenient in detection, and has high selectivity and high affinity of immunoreactions.

The invention relates to a preparation method of a nitrogen-doped hollow carbon ball loaded palladium-based catalyst, which comprises the following steps of: dispersing o-phenylenediamine in a solvent for being stirred at a low temperature, adding an initiator for reacting for 12-24h, then extracting and filtering, and drying in vacuum to obtain a poly(o-phenylenediamine) hollow ball; pyrolyzing an o-phenylenediamine polymer at a high temperature for 2-6h under the protection of an inert gas to obtain a nitrogen-doped hollow carbon ball; and dispersing the nitrogen-doped hollow carbon ball into water, adding a chloropalladic acid solution for ultrasonic treatment, adding a reducing agent for ultrasonic treatment, extracting and filtering after the reaction is completed, and drying in vacuum to obtain the nitrogen-doped hollow carbon ball loaded palladium-based catalyst. The nitrogen-doped hollow carbon ball loaded palladium-based catalyst prepared by adopting the preparation method has the nitrogen content of 10.4-22.4wt%, has the advantages of excellent oxidization reaction catalysis property to alcohol, stable performance, low preparation cost and simple preparation process, and is a novel high-performance catalyst for a low-temperature direct alcohol fuel cell anode.

The invention provides a method for preparing organic composite WO3 electrochomeric films. The method comprises the following steps: firstly, adding ammonium para-tungstate and polyethylene glycol to deionized water to obtain precursor sol; soaking ITO (indium tin oxide) glass substrates to the precursor sol, taking the ITO glass substrates out, drying and calcining to obtain mesoporous WO3 films on the ITO glass substrates; adding aniline and o-phenylenediamine to a hydrochloric acid solution, and stirring until the aniline and o-phenylenediamine dissolve, so as to obtain a mixed solution; putting the ITO glass into the mixed solution, then adding ammonium persulfate to the mixed solution, and pulling the ITO glass out after the polymerization reaction is completely conducted; and subjecting the ITO glass to deionized water washing and alcohol washing and holding at a room temperature to obtain the organic composite WO3 electrochomeric films. The organic composite WO3 electrochomeric films prepared by the invention are characterized by using porous WO3 films as substrates and poly(aniline / o-phenylenediamine) as an organic layer, for the WO3 film is the inorganic electrochomeric material with the best performance in the prior art and has the advantages of stable performance and long service life, while the poly(aniline / o-phenylenediamine) film has the advantages of short response time and good cyclic reversibility.

The invention relates to an electrochemical sensor based on a molecular engram and a preparation method and an application thereof. The electrochemical sensor based on the molecular engram comprises a working electrode, a reference electrode and a counter electrode, wherein the base electrode of the working electrode is a gold electrode; sulfonated graphene is modified on the surface of the gold electrode; after airing, polymerization is performed in an acid buffer solution containing o-phenylenediamine and dopamine till the oxidation peak current of the o-phenylenediamine falls to zero, and then dopamine is eluted in a sulfuric acid medium; and the reference electrode and the counter electrode are a saturated calomel electrode and a platinum wire electrode respectively. Under an optimal condition, a molecular engram sensor with molecule identifying performance is prepared by an appropriate eluting method, so that rapid analysis and detection of the dopamine are realized. The electrochemical sensor based on the molecular engram has the advantages of quick response, high selectivity, high sensitivity and the like on the molecular engram, the aim of identifying molecules is fulfilled, and detection of the dopamine in the presence of high-concentration ascorbic acid is realized.

The invention discloses a preparation method of an asymmetric N,N'-bis(salicylaldehyde)o-phenylenediamine aluminum compound LAlX and application of the compound in ring opening polymerization of lactone and lactide. The asymmetric N,N'-bis(salicylaldehyde)o-phenylenediamine aluminum compound LAlX has very obvious advantages that the raw materials are easily available, the synthetic route is simple, the product yield is high, the property is stable, a prepared product has rich and changeable structures, the catalytic performance is easy to control, and the product can meet requirements of different ring opening polymerization of lactone and lactide; and a prepared aliphatic polyester high polymer material has controllable structure and performance and can meet the requirements of industrial departments.

The present invention provides a method for preparation of poly(o-phenylenediamine) nano-belt comprising mixing aqueous solutions of o-phenylenediamine and of oxidant in a mole ratio of 1:0.1-1 under stirring; standing for 0.5-2 hrs at room temperature; and obtaining poly(o-phenylenediamine) nano-belt. The method is suitable for large-scale production. In the absence of template and surfactant, aqueous solutions of o-phenylenediamine and of oxidant are mixed in a specified mole ratio and thus obtain a poly(o-phenylenediamine) nano-belt with length of several hundred micrometers, width of several hundred nanometers and thickness of tens nanometers. The method is simple, quick and suitable for large-scale manufacture. The poly(o-phenylenediamine) nano-belt thus prepared possesses excellent semiconductor properties and is one of the most promising conductive polymer materials.

The invention belongs to the field of a high molecular material, which in particular relates to a polymer with lateral chains containing benzoglioxaline groups in the seires of sulfonated poly aryl ether ketone used for proton-exchange membranes of high-temperature fuel cells, and a preparation method thereof. Firstly, bisphenol monomers with lateral chains linked with carboxyls, fluorine-terminated monomers and sulfonated fluorine-terminated monomers react to prepare a sulfonated polyaryletherketone polymer with skeleton connected with carboxy groups; the degree of sulphonation of the polymer can be adjusted between 0 to 2 by adjusting the ratio of fluorine-terminated monomers and the sulfonated fluorine-terminated monomers. Subsequently, benzoglioxaline groups are introduced onto the lateral chain of the sulfonated polymer by adding ortho-phenylene diamine. Polyaryletherketone of different degrees of sulphonation with lateral chains containing benzoglioxaline groups can be prepared by adjusting the ratio of the sulfonated monomers and unsulfonated monomers. A series of membranes prepared are promising in application in the field of fuel cell membranes, in particular at high temperature.

The invention discloses a method for preparing an ion imprinting supported composite photocatalyst, which belongs to the technical field of environmental material preparation and comprises the following steps of: pre-treating hollow microspheres to obtain activated hollow microspheres; mixing tetrabutyl titanate and ethanol according to a proportion, performing accelerated stirring on the mixture to fully and uniformly disperse the mixture, and slowly adding dropwise the mixed solution of a concentrated hydrochloric acid, distilled water and absolute ethyl alcohol in a certain proportion to obtain TiO2 sol; impregnating the hollow microspheres into the TiO2 sol, and uniformly stirring the sol to a gel state at constant speed to obtain a TiO2 / hollow microsphere-supported photocatalyst; and performing ultrasonic dispersion on the prepared TiO2 / hollow microsphere-supported photocatalyst and the mixed solution of solution of o-phenylenediamine and Fe<n+> solution of certain acidity, and preparing the ion imprinting supported composite photocatalyst under ultraviolet-initiated polymerization. The supported catalyst of the invention is beneficial for improving the solar energy utilization rate and recovery rate of the catalyst, and has the advantage of relatively better treating antibiotic wastewater.

The invention relates to a method for preparing cyclic carbonate by reacting normal pressure carbon dioxide with epoxide. Propylene carbonate or ethylene carbonate is prepared by reaction under normal pressure carbon dioxide by taking epoxypropane or ethylene oxide as a substrate, corresponding propylene carbonate or ethylene carbonate as a solvent and Salen-Zn and tetraethyl ammonium bromide as a dual component catalyst, wherein the Salen-Zn is bissalicylaldehyde ethylenediamine-Zn, salicyladehyde cyclohexanediamine-Zn or bis-salicylaldehyde o-phenylenediamine-Zn. The method provided by the invention has the advantages that the catalyst is convenient to prepare, low in cost and less in use level; by using the product as the solvent, posttreatment is convenient; the method is low in reaction pressure, great in rate, safe to operate and suitable for scaled industrial production.

The invention discloses a DOPO-based symtriazine ring hydrogenated benzimidazole epoxy curing agent and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing a solvent I, tricyanogen chloride, p-hydroxy benzaldehyde and an acid-binding agent, introducing nitrogen gas, performing heating reaction to obtain 2,4,6-tri(4-formylphenoxy)-1,3,5-symtriazine ring; mixing a solvent II, the 2,4,6-tri(4-formylphenoxy)-1,3,5-symtriazine ring and DOPO, introducing nitrogen gas, and reacting to obtain DOPO-based formylphenoxy-1,3,5-symtriazine ring; dissolving the DOPO-based formylphenoxy-1,3,5-symtriazine ring in a solvent III, dropwise adding solute into a mixture of o-phenylenediamine and the solvent III, adding a catalyst, and reacting to obtain the DOPO-based symtriazine ring hydrogenated benzimidazole epoxy curing agent. According to the DOPO-based symtriazine ring hydrogenated benzimidazole epoxy curing agent, vertical combustion of cured matters passes UL94V-0 level; compared with non-flame-retardant epoxy resin, the glass-transition temperature is increased by 12.1% and the tensile strength is improved by 18.2%.

The invention discloses a method for utilizing a molecularly imprinted electrochemical sensor to detect trace gibberellin A3. The method comprises the following steps of: o-phenylenediamine is taken as a function monomer, and gibberellin is adopted as a moldboard molecule to obtain a gibberellin A3 molecularly imprinted film through polymerization of mitallic electrode surface electricity; in the hydrogen peroxide-hydroquinone bottom solution with the pH of 7.4, the polyamide-amine arborization macromolecule complexed with a ferric ion can carry out catalyzing degradation on the hydrogen peroxide under energization; and the gibberellin A3 in the sample is utilized to replace functionalized arborization macromolecule gibberellin A3, so that the reduction strength of p-benzoquinone to hydroquinone is increased, and a method for detecting the gibberellin A3 is established. When the gibberellin A3 is in concentration range of 3*10-7mol / L-6*10-9mol / L, the lifting degree of an electrochemistry signal and the concentration of the gibberellin A3 is of a good linear relationship, and the method detection limit is 2.0*10-9 mol / L. The method provided by the invention improves the detective sensitivity and selectivity, and the detection of the light concentration gibberellin A3 is easy to be automated.

Mono-acylated o-phenylendiamines derivatives of formula Iwherein X and R are as described herein, have been found useful for the treatment of diseases mediated by the inhibition of histone deacetylase, such as cancer.

The invention provides a 2-quinolinone compound and a preparation method and application thereof. The 2-quinolinone compound is 3-(2-benzimidazolyl)-6, 7-difluoro-2-quinolinone. The preparation method comprises the following steps: taking 3, 4-difluoro acetanilide as an initial raw material, reacting with POC13 (phosphorus oxychloride) and DMF (dimethyl formamide) to obtain 2-chlorine-6, 7-difluoro quinoline-3-formaldehyde, then hydrolyzing to generate 3-aldehyde group-6, 7-difluoro-2-quinolinone, then reacting with o-phenylenediamine to obtain the 2- quinolinone compound. The 2-quinolinone compound can be used as a fluorescent probe for quantitative detection of the content of Hg<2+>, and shows high sensitivity and selectivity, the detection process is simple and rapid, and the detection result is accurate.

The invention discloses a method for preparing a 2-substituted benzoxazole compound. According to the method, a benzylamine compound or a benzaldehyde compound or a benzyl alcohol compound, and o-toluidine-N-methyl-o-phenylenediamine, ortho-aminophenol and o-aminobenzenethiol serve as raw materials, metals palladium, platinum or ruthenium serves as a catalyst, and N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyrrolidone serves as a solvent. The method comprises the following preparation steps: (1) mixing the raw materials; (2) reacting; (3) separating and extracting; and (4) drying and concentrating. An oxidant and a hydrogen acceptor are not required in the whole preparation process, and the used partial catalysts can be recycled. The method is high in atom economy, simple in aftertreatment and mild in reaction conditions and has a certain industrial application prospect.

The invention discloses a fluorescence probe used for detecting a nitrite content and a production method and application thereof. The fluorescence probe contains a derivative with an anthracenecarbonamide group used as a fluorescence group and o-phenylenediamine used as a recognition group, wherein R1 is one of fatty alcohol, alkyl with 1-18 carbon and aryl. The fluorescence probe is reacted withnitrite through the recognition group under an acid condition, and for the nitrite, a novel detection means with compound signal response, namely color and fluorescence double response, is provided.The fluorescence probe is simple to produce and low in cost, has good selectivity, can be used for fast detection of nitrite in food, has large application prospects in detection of the nitrite in thefood, and is of great popularization significance.

The invention provides a process for producing o-phenylendiamine comprising the steps of, charging ortho dichlorobenzene, ammonia into high temperature, high pressure container, proceeding ammonolysis reaction at the presence of catalyst, analyzing and separating the obtained reactant, charging ortho dichlorobenzene, liquid ammonia, copper catalyst, phase shift catalyst into pipe type reactor continuously for ammonolysis reaction. The invention also discloses a production apparatus for realizing the method.

The invention relates to a benzimidazole preparation method for drug, catalyst and metal surface treatment agent, which uses o-phenylenediamine and aldehyde as raw materials, uses cheap air as oxidant and uses intermittent microwave heating method to synthesize benzimidazole compound. The invention eliminates the o-phenylenediamine and carboxyl acid (or ester) condensation method of traditional benzimidazole synthesis and eliminates the synthesis method with long reaction time and failure in large scale preparation, to directly synthesis o-phenylenediamine, aldehyde and air in microwave, optimizes reactant proportion, microwave heating time and catalyst or the like, with high-speed reaction, simple operation, low device demand and high yield, which can circulate to continuously synthesize benzimidazole to support the industrial production of benzimidazole compound.

The invention belongs to a method for producing phenylene diamine, in particular to the method for producing the phenylene diamine by performing hydrogenation reduction on mixed dinitrobenzene with palladium catalyst. The prior art which produces the phenylene diamine by performing the hydrogenation reduction by adopting a Raney nickel or carrier nickel catalyst has the disadvantages of high energy consumption, low raw material conversion rate, and poor product quality. The method comprises the following steps of: adding 100 weight parts of dinitrobenzene, 100 to 200 weight parts of alcohols solvents and 0.5 to 1 weight part of the palladium catalyst into a reaction kettle, wherein the temperature in the reaction kettle is between 40 and 60 DEG C and the pressure is between 0.25 and 0.60 MPa; performing hydrogenation for 30 to 120 minutes; conveying a reaction product to a filter; dealcoholizing in a dealcoholization tower for recovering to obtain phenylene diamine solution; and obtaining m-phenylenediamine, o-phenylenediamine and p-phenylenediamine products by dewatering, rectifying and separating. The method has the advantages of improving product quality, reducing raw material consumption and reducing production cost.

The present invention provides a method for preparation of poly(o-phenylenediamine) nano-belt comprising mixing aqueous solutions of o-phenylenediamine and of oxidant in a mole ratio of 1:0.1–1 under stirring; standing for 0.5–2 hrs at room temperature; and obtaining poly(o-phenylenediamine) nano-belt. The method is suitable for large-scale production. In the absence of template and surfactant, aqueous solutions of o-phenylenediamine and of oxidant are mixed in a specified mole ratio and thus obtain a poly(o-phenylenediamine) nano-belt with length of several hundred micrometers, width of several hundred nanometers and thickness of tens nanometers. The method is simple, quick and suitable for large-scale manufacture. The poly(o-phenylenediamine) nano-belt thus prepared possesses excellent semiconductor properties and is one of the most promising conductive polymer materials.

The invention discloses a carbon quantum dot solution which contains carboxyl and emits reddish orange fluorescent light and a preparing method thereof and relates to the technical field of quantum dot luminescence. The carbon quantum dot solution which contains carboxyl and emits reddish orange fluorescent light and the preparing method thereof aim to solve the problems of existing red-light-emitting materials that quantum efficiency is low, service life is short, and color purity is low, and the problems of existing red-light-emitting material preparing methods that complexity is high and cost is high. Maleic anhydride and o-phenylenediamine are dissolved in absolute ethyl alcohol and placed in a polytetrafluoroethylene reaction still; ultrasonic treatment and stirring are conducted in sequence; the reaction still is placed in a steel kettle, heating and natural cooling are conducted, and then a reactant is taken out after temperature is reduced to be room temperature; the reactant is filtered, and then the carbon quantum dot solution which contains carboxyl and emits reddish orange fluorescent light is obtained. The method is simple, easy to operate, low in cost and high in yield. The carbon quantum dot solution obtained with the method is high in fluorescence quantum efficiency, high in stability, capable of being placed in the air for a long time, and high in color purity. The carbon quantum dot solution is suitable for serving as a red-light-emitting material, and the method is suitable for preparing the carbon quantum dot solution which emits reddish orange fluorescent light.

The invention discloses a method for preparing an inorganic / organic composite electrochromic film. The prepared organic film is an aniline / o-phenylenediamine film, and inorganic adulterants are WO3 nano-particles. The method comprises the following steps: preparing a precursor from tungsten powder, citric acid and polyethylene glycol; and carrying out gelatinization, drying and calcination on the precursor to obtain nano WO3 powder; ultrasonically dispersing the WO3 powder in acidic aqueous solution, and adding aniline and o-phenylenediamine; stirring to dissolve the aniline and o-phenylenediamine, immersing processed ITO glass into the solution, and adding oxidants; and pulling to form a film, and drying the film at normal temperature to obtain the WO3 doped organic electrochromic film material.

The invention provides a method for preparing two-waveband single-photon and two-photon fluorescent carbon quantum dots and application, and the method comprises the following steps: preparing an o-phenylenediamine solution or a mixed solution of the o-phenylenediamine and an acid; putting the o-phenylenediamine solution or the o-phenylenediamine mixed solution into a reaction kettle, heating, reacting to obtain a product, and carrying out centrifugal separation on the product to obtain the two-waveband fluorescent carbon quantum dots with single-photon and two-photon fluorescence emission characteristics at the same time. The preparation method disclosed by the invention is simple, economical and easy to operate, can be used for preparing two-waveband long-waveband fluorescence luminous carbon quantum dots at one time, has the characteristics of long-waveband single-photon and two-photon fluorescence excitation and emission, and has a good application prospect in the biomedical fieldsof fluorescence labeling of biological cells and tissues, living body imaging and the like.

The invention discloses a preparation method of a phenol-amine alternately-assembled composite nano-filtration film. The preparation method comprises the following steps: (1) dipping a porous supportfilm in a polyamine monomer solution, taking out, washing the surface of the porous support film, and airing, wherein a polyamine monomer is at least one of o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, diethylenetriamine, triethylene tetramine, polyethyleneimine and piperazine, and the concentration of the polyamine monomer in the polyamine monomer solution is 0.1g / L-10g / L; and (2)dipping the aired porous support film in a polyphenol monomer solution, taking out, washing the surface of the porous support film, airing, and activating, so as to obtain the nano-filtration film, wherein a polyphenol monomer is at least one of catechol, dopa, dopamine, tannic acid, tea polyphenol and bisphenol fluorine, and the concentration of the polyphenol monomer in the polyphenol monomer solution is 0.1g / L-10g / L. The invention further discloses the composite nano-filtration film prepared by virtue of the preparation method. The composite nano-filtration film has the advantages of high flux and desalinization rate, good long-term operational stability and the like.

The invention belongs to the field of nano materials and biomedicines and discloses application and a synthesis method of a copper-containing photo-thermal nano material. O-phenylenediamine and L-cysteine are adopted as raw materials for one-step preparation of fluorescent carbon dots high in stability and water solubility by means of hydro-thermal synthesis, and the carbon dots and copper-containing salt solution are simply mixed to obtain the copper-containing photo-thermal nano material excellent in photo-thermal performance. The invention further provides a method for improving stability of the copper-containing photo-thermal nano material by surface modification.

The invention belongs to the field of metal organic framework materials used for analyzing and detecting disease markers and specifically relates to a fluorescence sensor for detecting uric acid and apreparation method thereof. Different concentrations of uric acid solutions with the same volume are vibrated and mixed with an NH2-BDC-MOF nanosheet solution, an uricase solution and an o-phenylenediamine solution, the uric acid solutions are stood under 37 DEG C for 30 minutes, and fluorescence signals are detected to construct a fluorescence signal-concentration work curve; then fluorescence signals in a sample are detected and substituted into the work curve to achieve the purpose of quantitatively analyzing uric acid in the sample. The method has the advantages of quickness, flexibilityand high efficiency.