206 results about "Aminotroponiminate" patented technology

The invention discloses a preparation method and application of amino-modified single-benzene-ring copper-based MOFs (metal organic frameworks), and the method comprises the following steps: dropwise adding a copper nitrate monohydrate solution into a diamino terephthalic acid solution, fully stirring to react, and centrifugally washing and drying the product to obtain the amino-modified single-benzene-ring copper-based MOFs. The amino-modified single-benzene-ring copper-based MOFs are used for electrocatalytic reduction of carbon dioxide. The prepared amino-modified single-benzene-ring copper-based MOFs have unique morphology, active sites can be exposed on the inner surface and the outer surface, the accessibility of the active sites is improved, and meanwhile the reaction mass transfer capacity is enhanced.

The invention discloses an IRMOF-1-NH2 / SBS composite modifier as well as a preparation method and application thereof, and belongs to the technical field of asphalt processing. The composite modifier is prepared from the following raw materials in percentage by mass: 28 percent to 35 percent of IRMOF-1-NH2, 53 percent to 61 percent of SBS (Styrene Butadiene Styrene), 0.2 percent to 0.4 percent of an accelerant and 10.6 percent to 14.6 percent of a compatilizer; the preparation method of the IRMOF-1-NH2 comprises the following steps: S1, adding soluble zinc salt and 2-aminoterephthalic acid into a solvent, carrying out ultrasonic treatment, reacting at 120-150 DEG C for 12-24 hours, and separating and washing to obtain a solid product; and S2, heating the solid product obtained in the step S1 at the temperature of 100-150 DEG C for 10-20 hours to obtain the IRMOF-1-NH2 crystal. The compound modifier disclosed by the invention can be used for efficiently storing aromatics, so that the effect of inhibiting the aromatics from being gelatinized is achieved, and the anti-aging performance of asphalt is remarkably improved.

The invention belongs to the technical field of chemical analysis and detection, and relates to a method for rapidly detecting sodium ions in cigarette paper by nano-enzyme laccase. According to the method, 2-aminoterephthalic acid, copper nitrate and cerous nitrate are taken as precursors, polyvinylpyrrolidone is taken as a stabilizer, and a solvothermal method is adopted to synthesize the copper-cerium-containing MOF-based nano-enzyme with laccase-like activity, namely Cu / Ce-BDC-NH2 nano-enzyme; cu / Ce-BDC-NH2 nano-enzyme oxidizes 2, 4-dichlorophenol and 4-aminoantipyrine to obtain a red product, the potassium pyroantimonate ligand is adsorbed on the surface of Cu / Ce-BDC-NH2 to inhibit catalytic action, so that laccase-like activity is reduced, Na < + > is introduced to react with potassium pyroantimonate to generate a stable complex, the activity of Cu / Ce-BDC-NH2 laccase is recovered, and the red color of a solution is deepened. The invention establishes a novel colorimetric rapid detection method for sodium ions.

The invention relates to the field of heavy metal ion recovery, and discloses an organic covalent material and a preparation method thereof, and a composite adsorption film and a preparation method and application thereof. The method comprises the following steps: in the presence of an organic solvent, mixing 2, 5-diamino terephthalic acid and a hydroxyl-containing benzene-1, 3, 5-tricarboxaldehyde derivative for reaction to obtain the organic covalent material. The organic covalent material provided by the invention is compounded with chitosan to prepare a composite adsorption film, and the composite adsorption film can be used for adsorbing heavy metal ions in a water body, is high in heavy metal ion adsorption capacity, can be recycled, and has a relatively great application prospect in the field of heavy metal ion recovery.

The invention relates to a preparation method of ordered mesoporous MOFs with a hollow structure and uranium extraction application of the ordered mesoporous MOFs, the molar ratio of terephthalic acid to aminoterephthalic acid is controlled at 92: 8 by accurately regulating and controlling the variety and content of organic ligands in a reaction system, and the uranium extraction application of the ordered mesoporous MOFs with the hollow structure can be realized while amino functionalization is realized. The ordered mesoporous MOFs with the hollow structure are rapidly synthesized in one step, and the method is simple and high in operability. Experiments prove that the ordered mesoporous MOFs with the hollow structure have excellent anti-interference capability, show high-selectivity adsorption on uranium, and provide a new idea and choice for extraction of uranium from seawater.

The invention relates to a preparation method of an MOF / MXene composite membrane and application of the MOF / MXene composite membrane in the field of antibiotic desalination separation membranes. The ZnBDC-NH2 MOF nanosheet is prepared by mixing 2-amino terephthalic acid and zinc acetate dihydrate, and the ZnBDC-NH2 MOF nanosheet is prepared by mixing 2-amino terephthalic acid and zinc acetate dihydrate. The preparation method comprises the following steps: mixing and dispersing MXene and the ZnBDC-NH2 MOF nanosheets, so as to prepare a colloidal suspension; and uniformly depositing the colloidal suspension on the surface of a substrate by adopting a vacuum-assisted self-assembly technology to form a uniform stacked structure. According to the ZnBDC-NH2 MOF nanosheet composite membrane with the MXene as the intercalation, nanosheets are arranged in order, and the ZnBDC-NH2 MOF nanosheet composite membrane has excellent mechanical strength and relatively high water flux, so that efficient and rapid separation of antibiotic molecules and salts is realized.

The present invention relates to a monovalent selective cation exchange membrane and a preparation method thereof, belonging to the technical field of cation exchange membranes. The specific steps are: weighing DA and ammonium persulfate and adding them to a buffer solution to obtain a PDA coating solution, pouring the PDA coating solution on the surface of a base membrane for soaking, depositing a PDA coating on the surface of the activated base membrane to obtain membrane I; dissolving zirconium tetrachloride and 2-aminoterephthalic acid in DMF, then solvent-thermally synthesizing an amino-functionalized MOF (UIO-66-NH2) under acidic conditions, weighing PEI and MOF (UIO-66-NH2) powders and adding them to a buffer solution, then pouring them on the surface of membrane I, depositing a PEI-MOF composite coating to obtain membrane II, and air-drying membrane II to obtain a monovalent selective cation exchange membrane. It can be seen that the present invention can prepare a low-cost, highly selective, and stable-performance monovalent selective cation exchange membrane by modifying the cation exchange membrane through a simple and easy-to-operate method.

The invention relates to the technical field of nanofiber porous membranes, in particular to an electrostatic spinning nanofiber porous membrane for protective clothing. The electrostatic spinning nanofiber porous membrane for the protective clothing is prepared from the following raw materials in parts by mass: 5 to 15 parts of polyvinylidene fluoride, 1 to 2 parts of zirconium chloride, 5 to 15 parts of titanium dioxide aerogel, 0.5 to 1.5 parts of 2-aminoterephthalic acid, 1 to 3 parts of glacial acetic acid, 1 to 5 parts of collagen and 1 to 2 parts of carbon nanotubes. The titanium dioxide aerogel is prepared by the following steps: adding butyl titanate and graphene oxide into ethanol, uniformly stirring, adjusting the pH value of the system to 3-4, stirring for 10-20 minutes, standing for 1-2 hours at 60-70 DEG C, filtering, washing, drying, crushing, mixing with carboxyl-terminated polyamidoamine, adding into water, carrying out ultrasonic treatment, freezing, carrying out vacuum drying, and crushing. The composite film is excellent in structural stability, good in barrier property, high in puncture-resistant strength and excellent in moisture penetrability.

The invention belongs to the technical field of lubricating oil manufacturing, and relates to composite lubricating oil used in an aluminum rolling process, which comprises the following components in parts by mass: 94-96 parts of base oil, 0.5-1.5 parts of an oiliness agent, 0.5-0.8 part of an extreme pressure anti-wear agent, 0.5-1.5 parts of a wear-resistant antioxidant, 0.5-2 parts of oleic acid diethanolamide and 0.5-1 part of an antirust agent. On the basis of the prior art, nano-sheet molybdenum disulfide is introduced and added into 2-aminoterephthalic acid and nickel nitrate to react to prepare a modified metal organic framework, then carnosic acid is grafted through an amide reaction to prepare the wear-resistant antioxidant, and a protective film can be formed on a friction interface through a sheet structure of molybdenum disulfide, so that the friction coefficient is reduced; the wear resistance is improved; a compact passive film is formed on the surface of aluminum metal through the synergistic effect of the extreme pressure anti-wear agent and the wear-resistant antioxidant, and the corrosion resistance and wear resistance of the composite lubricating oil used in aluminum plate rolling are improved.

The invention relates to a monovalent selective cation exchange membrane and a preparation method thereof, and belongs to the technical field of cation exchange membranes, and the specific steps are as follows: weighing DA and ammonium persulfate, adding into a buffer solution to obtain a PDA coating solution, pouring the PDA coating solution on the surface of a base membrane for soaking, and depositing a PDA coating on the surface of the activated base membrane to obtain a membrane I; the preparation method comprises the following steps: dissolving zirconium tetrachloride and 2-aminoterephthalic acid in DMF (Dimethyl Formamide), performing solvothermal synthesis on amino-functionalized MOF (UIO-66-NH2) under an acidic condition, weighing PEI and MOF (UIO-66-NH2) powder, adding into a buffer solution, pouring on the surface of a membrane I, depositing a PEI-MOF composite coating to obtain a membrane II, and air-drying the membrane II to obtain the monovalent selective cation exchange membrane. Therefore, the monovalent selective cation exchange membrane which is low in cost, high in selectivity and stable in performance can be prepared by modifying the cation exchange membrane through a simple and easy-to-operate method.

The invention relates to the technical field of gas separation membrane materials, in particular to a preparation method of a PIL-MOF composite membrane and application of the PIL-MOF composite membrane in CO2 / N2 separation.The preparation method comprises the steps that S1, a PET base membrane is pretreated, specifically, the PET membrane is soaked in a 3M HNO3 solution for 8-12 hours, washed with deionized water to be neutral and then dried; s2, in-situ growth of UiO-66-NH2: dissolving zirconium tetrachloride in acetic acid, preserving heat at 80 DEG C for 0.5-1.5 hours, cooling, adding DMF and 2-aminoterephthalic acid to form a precursor solution, dipping the pretreated PET film for 1-3 hours, and performing solvothermal reaction at 110-130 DEG C for 18-24 hours to obtain a PET / UiO-66-NH2 film; and S3, photo-initiation polymerization: coating the surface of the PET / UiO-66-NH2 film with a solution containing [VBIM] [BF4], a cross-linking agent and a photoinitiator, carrying out 365 nm ultraviolet light curing for 0.5-2 h, and drying to obtain the PIL-MOF composite film. The composite membrane combines the porous characteristic of the metal organic framework and the functional characteristic of the ionic liquid, and has application value in the fields of gas separation, catalysis and the like; the preparation process is simple, the interface bonding strength is high, and the product performance is stable.

The invention discloses an antibacterial antifouling agent as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out chemical grafting on an amino terephthalic acid compound by adopting benzisothiazolinone to prepare a functional ligand; and carrying out a reaction on a metal salt and the functional ligand to prepare the antibacterial antifouling agent. The antibacterial antifouling agent disclosed by the invention shows broad-spectrum antibacterial activity on gram-negative bacteria and gram-positive bacteria, and has anti-algae performance and good biocompatibility; meanwhile, the antibacterial and antifouling agent is compounded into water-based acrylic resin, the obtained coating still has excellent antibacterial and anti-algae performance, the ligand engineering strategy effectively breaks through the bottleneck that traditional MOFs ligands are insufficient in antibacterial activity, and an innovative path is provided for developing long-acting, synergistic and practical MOF-based antibacterial and antifouling materials.

The invention relates to the technical field of nano-enzymes, and discloses a copper-based nano-enzyme with laccase and peroxidase double-enzyme activity and preparation and application thereof, and the copper-based nano-enzyme is a nano-material prepared by forming MOF through solvothermal reaction of copper ions and diamino terephthalic acid and then performing electrostatic adsorption on the MOF and polyoxometallate. The copper-based nano enzyme has high-efficiency laccase-like activity and peroxidase-like activity at the same time through the combination and synthesis process of the copper ion cluster and the organic ligand. The invention further discloses a preparation method of the copper-based nano-enzyme, peroxidase activity detection and application of the copper-based nano-enzyme to degradation and determination of dichlorophenol. The copper-based nano-enzyme provided by the invention has high catalytic activity and stability, is low in cost and easy to prepare, and can be applied to biosensing detection of hydrogen peroxide and environmental remediation degradation of organic pollutants such as phenols and dyes.

The invention discloses a mixed matrix membrane based on defect MOF and a preparation method and application thereof, and the method comprises the following steps: (1) dissolving a hydroxyl-containing monodentate carboxyl organic ligand and 2-aminoterephthalic acid in a solvent A, stirring at room temperature, and carrying out ultrasonic treatment to obtain a mixed solution; then dropwise adding tetraisopropyl titanate into the mixed solution, and carrying out heating reaction in a reaction kettle; after the reaction is finished and cooling is carried out, a solid product is collected through centrifugation, washed and dried, and DN-MIL-125 is obtained; (2) dispersing DN-MIL-125 in a solvent B to obtain a DN-MIL-125 suspension, dissolving an intrinsic microporous polymer cPIM-1 in a solvent C to obtain a cPIM-1 solution, and then uniformly mixing the cPIM-1 solution with the DN-MIL-125 suspension to obtain a membrane casting solution; and carrying out defoaming treatment on the membrane casting solution, and forming a membrane by adopting a solution casting method to obtain the mixed matrix membrane DN-MIL-125 / cPIM-1. According to the method, the defective metal organic framework material DN-MIL-125 is added into the cPIM-1 intrinsic microporous polymer to prepare the mixed matrix membrane, and the separation performance of CO2 / N2 gas can be remarkably improved.

The invention particularly relates to a phosphotungstic acid / amino-functionalized UiO-66 bifunctional catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving zircon salt, terephthalic acid and 2-aminoterephthalic acid in an organic solvent; adding a regulator acetic acid, and activating to prepare amino-functionalized UiO-66; and slowly dropwise adding a phosphotungstic acid acetonitrile solution into the amino-functionalized UiO-66 acetonitrile dispersion liquid, stirring and reacting at room temperature, and separating and drying to obtain the catalyst HPW at amino-functionalized UiO-66. The bifunctional catalyst (phosphotungstic acid / amino-functionalized UiO-66) is coordinated through an acid-base site at a lower temperature (170 DEG C vsgt; according to the present invention, the reaction is performed at the temperature of 200 DEG C, the formation of carbon deposition can be substantially inhibited at the low temperature, and the catalyst has characteristics of high catalytic activity after five cycles, extraordinary hydrothermal stability and chemical stability, can maintain the stability of the catalyst in the reaction environment with the existence of a small amount of water, and has good and broad application prospects.

The invention belongs to the technical field of synthesis of ester compounds, and particularly relates to a preparation method of 2, 6-dichloro-4-cyanobenzoic acid methyl ester, which comprises the following steps: by taking dimethyl 2-aminoterephthalate as a raw material, sequentially carrying out substitution reaction, deamination reaction, hydrolysis reaction, amidation reaction and dehydration reaction to obtain the 2, 6-dichloro-4-cyanobenzoic acid methyl ester. The 2, 6-dichloro-4-cyanobenzoic acid methyl ester is prepared by the method, and the yield reaches 59.28%. The N-chlorosuccinimide is used as a chlorine source to carry out substitution reaction on the 2-amino dimethyl terephthalate, so that the potential safety hazard caused by the traditional chlorination reagent is avoided, and the tert-butyl nitrite used in the deamination reaction avoids the potential safety hazard caused by the use of strong corrosive sulfuric acid; the amidation reaction is completed in one step by adopting a condensing agent, so that the complicated operation caused by firstly preparing acyl chloride and then carrying out condensation reaction is avoided, and therefore, the preparation method has the characteristics of safe preparation process, environment friendliness, simplicity in operation and the like under the condition of ensuring the product yield and purity.

The invention discloses a fiber membrane prepared based on in-situ growth and its application in adsorbing toluene, and belongs to the technical field of functional textiles. The method for preparing fiber membrane based on in-situ growth in the present invention comprises the following steps: (1) adding 2-aminoterephthalic acid and polyacrylonitrile in a solvent, mixing uniformly, and obtaining a spinning solution; (2) subjecting the spinning solution to electrostatic spinning, drying, and obtaining a fiber membrane; (3) placing the fiber membrane in an ethylene glycol solution, adding ethylenediamine, and performing thermal crosslinking; after thermal crosslinking is completed, washing, drying, and obtaining a fiber membrane after crosslinking; (4) placing the fiber membrane after crosslinking in a solvent, adding zirconium oxychloride, 2-aminoterephthalic acid, and benzoic acid, performing in-situ growth, and obtaining a fiber membrane prepared based on in-situ growth. The fiber membrane prepared based on in-situ growth of the present invention has a high adsorption capacity for toluene, is recyclable, and can be recycled.

The invention relates to the technical field of energy conversion materials, and discloses a metal organic framework nano material with adjustable photo-thermal performance and a preparation method of the metal organic framework nano material. According to the method, two ligands with different functional groups, namely 2-aminoterephthalic acid and 2-fluoroterephthalic acid, are used for regulating and controlling the near-infrared light absorption capacity of the metal organic framework, so that the photothermal conversion temperature is accurately controlled by changing the proportion of the ligands. Compared with the traditional mode of improving the photo-thermal performance by depending on changing the optical power density, the metal organic framework nano material provided by the invention has remarkable advantages in the aspects of preparation process, structure controllability and photo-thermal conversion performance regulation and control.

The invention discloses a preparation method and application of a bimetallic nano-enzyme induced MOFs (at) CDs material, and the preparation method at least comprises the following steps: I, dissolving FeCl3, CoCl2 and 2-aminoterephthalic acid in N, N '-dimethylformamide to form a mixed solution I, and carrying out a reaction I to obtain a bimetallic MOFs material; step II, mixing tricarballylic acid and m-phenylenediamine, and carrying out a reaction II to obtain carbon dot powder; step III, dissolving the carbon dot powder obtained in the step II in methanol, and adding rhodamine B dye to obtain a CDs material; and IV, dissolving the bimetallic MOFs material obtained in the step I and the CDs material obtained in the step III in water, stirring, and drying to obtain the MOFs (at) CDs material. The synthesized nano-enzyme is simple to prepare and high in catalytic activity, the carbon dot material is encapsulated into the MOFs material, the fluorescence characteristic of the MOFs material is enhanced, and the carbon dot material is combined with o-phenylenediamine to be used for detecting H2O2.

The invention relates to the field of catalysts and environmental pollution treatment, in particular to an NH2-MIL-101 (Fe, Mn) piezoelectric catalyst, a preparation method and application thereof and a method for removing basic groups, antibiotics and antibiotic resistance genes in water. The preparation method comprises the following steps: mixing ferric salt, manganese salt and 2-aminoterephthalic acid, and reacting to obtain the NH2-MIL-101 (Fe, Mn) piezoelectric catalyst. The NH2-MIL-101 (Fe, Mn) piezoelectric catalyst provided by the invention has excellent piezoelectric catalysis performance and good stability, and can obviously improve the reaction efficiency of piezoelectric catalysis PDS with electrons and holes, thereby improving the removal efficiency of basic groups, antibiotics and antibiotic resistance genes in water.

This invention belongs to the field of analytical detection technology and relates to a method for detecting estradiol using a combination of organometallic framework enrichment and enzyme-linked immunosorbent assay (ELISA). A magnetic organometallic framework solid-phase extractant is used to enrich estradiol in the sample, followed by detection of the enriched estradiol using ELISA. The magnetic organometallic framework solid-phase extractant is prepared by subjecting mercaptoacetic acid-modified Fe3O4 particles, zirconium salt, and 2-amino-terephthalic acid to a solvothermal reaction at 110–130°C for 22–26 hours. The detection method provided by this invention has advantages such as short detection time, high sensitivity, good specificity, and high accuracy, thereby enabling the detection of trace amounts of estradiol in environmental water samples.

The invention discloses a preparation method of an MOF material for food detection, and relates to the technical field of food detection materials. The MOF material for food detection comprises the following raw materials in parts by weight: 15-25 parts of zinc nitrate, 12-18 parts of modified terephthalic acid, 8-12 parts of 2-aminoterephthalic acid, 10-14 parts of cobalt nitrate hexahydrate and 180-220 parts of N, N-dimethylformamide. The graphene quantum dot / graphene quantum dot composite material is prepared from the following raw materials in parts by weight: 100 parts of N, N-dimethylformamide, 130 to 170 parts of absolute ethyl alcohol, 180 to 220 parts of deionized water, 4 to 6 parts of polyvinylpyrrolidone, 0.008 to 0.012 part of modified graphene quantum dots, 4 to 6 parts of mercaptopropionic acid, 2 to 4 parts of dopamine, 1.5 to 2.5 parts of aminated multi-walled carbon nanotubes, 7 to 11 parts of triethylamine, 1 to 3 parts of montmorillonite nanosheets, 0.5 to 1.5 parts of gold nanoparticles and 2 to 4 parts of chitosan. The MOF material prepared by the invention is endowed with high selectivity, high sensitivity, quick response and strong stability through deep modification of terephthalic acid and graphene quantum dots. By combining a multi-step composite process, the material can be used for widely detecting various harmful substances such as heavy metals and pesticide residues, is adaptive to complex food matrixes and has industrial application potential.

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a Fe-MOF derived carbon-coated Copc composite material and a preparation method and application thereof. Comprising the following steps: mixing a ferric salt solution and a 2-aminoterephthalic acid solution, and carrying out solvothermal reaction to obtain NH2-MIL-101 (Fe); the preparation method comprises the following steps: by taking NH2-MIL-101 (Fe) as a carrier, adding cobalt phthalocyanine turbid liquid, and carrying out in-situ impregnation loading, so as to obtain the Fe-MOF derived carbon (at) Copc composite material. The Fe-MOF derived carbon-coated Copc composite material is obtained by uniformly dispersing cobalt phthalocyanine on MOF through a simple in-situ impregnation loading mode and a strong pi-pi stacking effect, has good wave absorption performance, enhances interface polarization loss, optimizes impedance matching and adapts to various loss coordination mechanisms, and has good application prospects. The heat resistance and the wave-absorbing property of the material are effectively improved.

The invention belongs to the technical field of waste PA6 recycling, and relates to a method for preparing PA6@CaF2@SiO2 fluorescent powder from PA6, wherein CaF2@SiO2 and PA6 are compounded in a mixed solvent by a dissolution precipitation method to obtain PA6@CaF2@SiO2 fluorescent powder; the mixed solvent is composed of methanol and ethanol; the preparation process of CaF2@SiO2 is as follows: firstly, CaF2 and tannic acid solution are uniformly mixed, then SiO2 is added and mixed uniformly to obtain a CaF2 / SiO2 dispersion, then a phytic acid / polyvinyl alcohol / mannitol / aminoterephthalic acid solution is added to the CaF2 / SiO2 dispersion and mixed uniformly, and CaF2@SiO2 is obtained by post-processing. The invention realizes the effective recycling of waste PA6 and endows the composite powder with good dimensional stability and fluorescent function.

The application provides a 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal as well as a preparation method and application thereof, the eutectic crystal is of a triclinic system, a space group is a cell parameter is alpha = 95.041 (2) °, beta = 90.337 (2) °, gamma = 97.670 (2) °, and a cell volume is The 2-amino terephthalic acid dimethyl ester-tetracyano benzene eutectic crystal provided by the application increases the solid melting point of the organic compound from 133.39 DEG C to 162.23 DEG C without changing the covalent bond of the compound, enhances the thermal stability, and meanwhile, the fluorescence emission color, the fluorescence lifetime and the quantum yield are obviously changed.

The invention discloses a composite heat storage material based on a metal organic framework and a preparation method thereof.The preparation method comprises the steps that a Ca (OH) 2-Ce (OH) 3 coprecipitation calcium-based material mixed solution is prepared, ZrCl4 and 2-aminoterephthalic acid are dissolved in a DMF solvent according to the molar ratio of 1: 1 to react and be compounded to obtain MOF, then the MOF is added into the coprecipitation solution prepared in the step 1, and the MOF and the coprecipitation solution are fully mixed through magnetic stirring; and then sequentially carrying out drying treatment and calcination to synthesize a porous structure, and finally carrying out calcination to remove carbon so as to obtain the high-temperature stable porous nano Ca-Ce-Zr composite calcium-based material. The CaO material is subjected to modification design, CaO doped with CeO2 and high-temperature-resistant MOF are compounded to prepare the heat storage material, the sintering problem of CaO in high-temperature thermochemical heat storage (TCES) circulation can be effectively solved, and the structural stability and reaction kinetics performance of CaO are improved.

The invention relates to the technical field of analysis and detection, in particular to a preparation method and application of a fluorescence enhanced sensor based on porphyrin-based carbon dots, and the specific technical scheme is as follows: the preparation method comprises the following steps: (1) dissolving 2-aminoterephthalic acid in DMF; (2) dissolving the TAPP in ultrapure water; (3) mixing the solution obtained in the step (1) and the solution obtained in the step (2), stirring at normal temperature and normal pressure, and then carrying out hydrothermal reaction at 200 DEG C for 2 hours to obtain TAPP-CDs; and (4) filtering the TAPP-CDs solution by using a microfiltration membrane, and dialyzing the filtrate to obtain the porphyrin-based carbon dots. The fluorescence enhanced sensor constructed by the invention has a good enrichment effect on the aflatoxin B2, has high sensitivity, selectivity and anti-interference performance, can accurately detect and analyze the aflatoxin B2 in an actual grain sample, and has the advantages of simple operation, low cost, high sensitivity and the like.

The present invention discloses an NH2-UiO-66 / PyCD-COF heterojunction photocatalyst and its preparation method and application. The preparation method includes: S1, dissolving zirconium chloride to obtain solution A; dissolving 2-aminoterephthalic acid to obtain solution B; S2, mixing and stirring, and reacting at 120-125 °C for 16-18 h to obtain NH2-UiO-66; S3, adding NH2-UiO-66, 1,3,6,8-tetrakis(4-formylphenyl)pyrene, and 2-chloro-1,4-phenylenediamine into an ortho-dichlorobenzene / n-butanol solution containing acetic acid, ultrasonic mixing in a Pyrex tube, freeze-degassing, and then vacuum-sealing; S4, reacting at 120 °C-130 °C for 3-5 days to obtain the NH2-UiO-66 / PyCD-COF heterojunction photocatalyst. The process of the present invention is simple and highly operable, and has excellent photocatalytic hydrogen production performance.

The invention discloses a gallium metal organic framework material which is prepared by the following steps: (1) dissolving 2-aminoterephthalic acid and itaconic acid in an organic solvent to obtain a solution A; (2) dissolving gallium nitrate hydrate in an organic solvent to obtain a solution B containing gallium ions; and (3) mixing the solution A with the solution B, heating at 50-70 DEG C for 3-5 hours, centrifuging, collecting the precipitate, and purifying to obtain the product. Itaconic acid and 2-aminoterephthalic acid are combined as double ligands, gallium ions are used as metal nodes, the gallium metal organic framework material is jointly constructed, the technical problems that itaconic acid in a free form is short in biological half-life period and low in cellular uptake efficiency are solved, the itaconic acid and the gallium ions are coordinated to achieve anti-inflammatory and antibacterial effects, and the gallium metal organic framework material has good application prospects. The compound can remove planktonic bacteria, has strong anti-biofilm activity, and can be used for preparing drugs for treating suppurative arthritis.

The invention discloses a preparation method of an MXene / NH2-MIL-125 composite film, and the preparation method comprises the following steps: carrying out etching treatment on Ti3AlC2, so as to obtain a Ti3C2Tx MXene nanosheet; the preparation method comprises the following steps: synthesizing NH2-MIL-125 (Ti) nanoparticles by taking 2-aminoterephthalic acid as an organic ligand and tetrabutyl titanate as a metal precursor through a solvothermal method; ti3C2Tx MXene nanosheets and NH2-MIL-125 (Ti) nanoparticles are added into deionized water according to the mass ratio of 1: (1-9) to be uniformly dispersed, an MXene / NH2-MIL-125 composite membrane is obtained through vacuum filtration, and the surface hydrophilicity of the membrane can be effectively improved by regulating and controlling the ratio of MXene to NH2-MIL-125 (Ti), so that the efficient separation membrane with super-hydrophilic and underwater super-oleophobic characteristics and excellent separation performance is obtained, and the separation efficiency is improved. And efficient separation, precious metal ion recovery and organic dye removal of the oil-in-water emulsion can be realized at the same time.