77 results about "4-Nitrophenol" patented technology

The invention belongs to the technical field of analytical chemistry and pesticide residue detection, and relates to a phosphate hydrolysis nano-enzyme sensing array-based p-nitrophenol pesticide identification and detection method, which comprises the following steps of: performing five groups of parallel data matrixes on each type of p-nitrophenol pesticide to distinguish single / five types of p-nitrophenol pesticides with different concentrations; establishing a discrimination model of different concentrations / types of pesticides by using the data matrix, and obtaining an HCA map and an LDA score map of the p-nitrophenol pesticides through hierarchical clustering analysis and linear discriminant analysis; after the absorbance value of the sample to be detected is measured, the sample to be detected can be identified and detected through comparison. According to the present invention, by using the inherent dynamic difference existing during the catalytic hydrolysis of different p-nitrophenol pesticides by CeO2, a plurality of reaction time points are selected to measure the absorbance change, the time-resolved sensing array fingerprint is constructed, and the type identification and the concentration quantification of a variety of p-nitrophenol pesticides and the mixture thereof are achieved by combining the pattern identification algorithm, such that the sensitivity is high, and the detection result is accurate. The measurable concentration range is 1-50 mu g / mL.

The invention discloses nearly-spherical silver powder formed by self-assembly of silver nanosheets and a preparation method and application of the nearly-spherical silver powder, and belongs to the technical field of micro-nano material preparation. The preparation method comprises the following steps: firstly, adding a dispersing agent solution into a silver precursor compound solution, stirring, then adding a morphology control agent solution, stirring, and finally adding a reducing agent solution for reaction; and after the reaction is completed, the prepared silver powder is washed and dried, and the nearly-spherical silver powder formed by self-assembly of the silver nanosheets is obtained. The nearly-spherical silver powder is formed through self-assembly of the silver nanosheets, the particle size range of the nearly-spherical silver powder is 0.5-2.0 m, the thickness range of the self-assembled silver nanosheets is 10-50 nm, the overall size is uniform, a large number of stacking faults exist on the surfaces of the silver nanosheets, and the silver nanosheets show an excellent catalytic effect in conversion of p-nitrophenol into p-aminophenol.

The invention belongs to the field of soil environment pollution simulation and prediction, and provides a prediction method based on a two-point chemical unbalanced model, which is used for quantitatively evaluating the effect of regulating and controlling the migration behavior of p-nitrophenol in acid red soil by straw stalk biochar. According to the method, a biochar-red soil composite medium system is constructed, a soil column leaching experiment is carried out to obtain penetration curve data, a two-point chemical unbalance model in CXTFIT software is utilized to carry out parameter inversion, and key parameters such as a retardation factor, a two-region distribution coefficient, a mass transfer coefficient and a liquid phase degradation coefficient are accurately identified. Model verification shows that the goodness of fit is high, and a parameter change rule reveals the inherent mechanism of enhancing the pollutant retention capacity, changing the proportion of fast and slow adsorption sites and influencing mass transfer kinetics by the biochar. Based on the verified model, the long-term migration behavior and pollution risk of p-nitrophenol under different environmental conditions can be simulated, and a scientific basis is provided for groundwater pollution control and remediation strategy optimization.

The invention belongs to a fluorescence analysis and detection method of p-nitrophenol, and particularly relates to a fluorescent carbon quantum dot probe for detecting p-nitrophenol as well as a preparation method and application of the fluorescent carbon quantum dot probe. The specific preparation method of the fluorescent carbon quantum dot probe comprises the following steps: taking aminopyrimidine as a precursor, mixing aminopyrimidine with water, and reacting at 160-200 DEG C to obtain the fluorescent carbon quantum dot probe with the surface rich in hydroxyl, amino and carboxyl groups. The fluorescent carbon quantum dot probe prepared by the invention has a strong fluorescent signal, selectively responds to p-nitrophenol, shows a wider linear detection range and high anti-interference capability, and is suitable for complex environmental pollutant detection.

The invention discloses a process for continuously separating tar from p-nitrophenol, and relates to the technical field of p-nitrophenol, which comprises the following steps: adding nitrobenzene and a sodium hydroxide solution into a microwave reactor in proportion, hydrolyzing at a certain temperature and pressure under the assistance of ultrasonic waves, and filtering to obtain a filtrate; performing counter-current extraction on the obtained hydrolysate through an alkaline water phase, a polar organic solvent phase and an ionic liquid phase in sequence, then performing rotary evaporation under the conditions that the vacuum degree is (-0.08)-(-0.095) MPa and the temperature is 50-70 DEG C, and collecting fractions; the temperature of the upper section of the spiral packing layer is 40-50 DEG C, the temperature of the middle section of the spiral packing layer is 60-70 DEG C, the temperature of the lower section of the spiral packing layer is 80-90 DEG C, and finally high-purity p-nitrophenol is obtained. In the process, the conversion rate of nitrobenzene is higher, and the prepared p-nitrophenol has higher purity.

The invention discloses an application of a copper nano-cluster with stable ascorbic acid in detection of p-nitrophenol, the copper nano-cluster with stable ascorbic acid is used as a fluorescent probe, and the detection of p-nitrophenol is realized through a fluorescent sensing method. Due to the quenching effect of p-NP, the fluorescence intensity of the system is obviously reduced in the presence of p-NP. The p-NP concentration can be quantitatively detected by comparing the fluorescence intensity of the copper nano-cluster and the fluorescence intensity of a quenching system. The method is simple, sensitive and high in selectivity, does not need complex fluorescent dye labeling, shows remarkable potential for p-NP detection, and has a good application prospect in the aspects of food, medicine and the like.

The invention discloses an aluminum alloy material easy to oxidize and color and a preparation method thereof.The aluminum alloy material is prepared from, by weight, 20-25 parts of aluminum alloy powder, 5-10 parts of graphene, 4-6 parts of p-nitrophenol, 0.5-1 part of concentrated bromine water and 4-7 parts of magnesium powder. And graphene treatment, aluminum alloy and graphene dispersion treatment, drying, water washing and vacuum hot pressing are carried out. Graphene is doped with the aluminum alloy, the comprehensive performance of the aluminum alloy can be remarkably improved, the hardness can be improved, the electrical conductivity and the thermal conductivity can be remarkably improved, halogen elements are introduced, the activity of the aluminum alloy is improved, the oxidized capacity is improved, the coloring efficiency is improved, and the flame retardant property is improved; and the magnesium powder is added, so that the stability of the system is protected, and the hardness of the system is improved.

The invention belongs to the technical field of membrane catalysis, and relates to a method for reducing the Co particle size of a multi-channel Co / CM catalytic membrane. And coating the surface of the Co / CM catalytic membrane with a polydopamine coating, and then drying and calcining the Co / CM catalytic membrane. According to the method for reducing the particle size of Co in the Co / CM catalytic membrane, the particle size of Co can be effectively reduced, so that the active component Co in the catalytic membrane is re-dispersed, and the activity of the catalytic membrane in a p-nitrophenol catalytic hydrogenation reaction is obviously improved.

The present invention provides a bimetallic ZIFs-supported nanocatalyst, a preparation method, and an application thereof. The bimetallic ZIFs-supported nanocatalyst of the present invention comprises a Zn-Cu bimetallic ZIFs material and metal Cu(0) supported on the Zn-Cu bimetallic ZIFs material. The preparation method of the catalyst of the present invention comprises: contacting a dispersion of the Zn-Cu bimetallic ZIFs material with a reducing agent to obtain the bimetallic ZIFs-supported nanocatalyst. The catalyst of the present invention exhibits high catalytic activity and stability in the catalytic degradation of p-nitrophenol.

The invention discloses a polyelectrolyte multilayer film loaded gold-palladium bimetallic nanoparticle catalyst, which is characterized in that cationic polyelectrolyte poly (diallyldimethylammonium chloride) PDDA and anionic polyelectrolyte sodium polystyrenesulfonate (PSS) are used as construction materials, a layer-by-layer self-assembly technology is adopted to prepare a polyelectrolyte multilayer film, and the polyelectrolyte multilayer film is marked as (PDDA / PSS) n + 0.5, and firstly loading gold nanoparticles on the multilayer film through an ion exchange-in-situ reduction method, and then loading palladium nanoparticles on the multilayer film to obtain the catalyst (PDDA / PSS) (n + 0.5 / a) AubPd for catalyzing the degradation of p-nitrophenol. According to the polyelectrolyte multilayer film loaded gold-palladium bimetallic nanoparticle catalyst disclosed by the invention, by selecting and designing the material and the layer number of the multilayer film carrier and the proportion of gold and palladium bimetallic, the synergistic catalysis of the polyelectrolyte film and the gold-palladium bimetallic nanoparticles is exerted; the catalytic efficiency and the degradation effect of the catalyst in the p-nitrophenol degradation process are obviously improved.

The application discloses a fluorescence analysis system for specific response to p-nitrophenol based on gold nanoclusters AuNCs@CFP, 200 muL of gold nanoclusters AuNCs@CFP, 500 muL of PB buffer solution with pH=10 and to-be-detected p-nitrophenol are diluted to 4 mL, the fluorescence intensity of the mixture is determined at an excitation wavelength of 334 nm after reaction at 45 DEG C for 50 min, the concentration of the to-be-detected p-nitrophenol is calculated according to the determined fluorescence intensity and a regression equation, the linear concentration range of the p-nitrophenol is 1.25-40 muM, the regression equation is F0 / F i =0.0258C+1.0003, F0 and F i are the fluorescence intensities of the mixture before and after the addition of the p-nitrophenol respectively, the correlation coefficient R 2 =0.9922, the detection limit LOD is 1.92 muM, the concentration of the p-nitrophenol is 25 muM, the relative standard deviation RSD is 1.13% in 11 repeated determinations. The preparation method of the gold nanoclusters AuNCs@CFP in the application is simple and easy to synthesize, and the fluorescence performance of the gold nanoclusters AuNCs@CFP is excellent.

The invention discloses a texturing process of a single crystal battery piece. The texturing process comprises the following steps: S1, performing pre-texturing treatment on a silicon wafer by adopting pre-texturing liquid; s2, texturing the silicon wafer by adopting texturing liquid; the prefabricated down liquid comprises polyvinylpyrrolidone and polyvinyl alcohol; the texturing liquid comprises inorganic alkali, a defoaming agent and a catalyst; the inorganic base is selected from at least one of sodium hydroxide and potassium hydroxide, and the defoaming agent is selected from at least one of dodecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, diethylene glycol, triethylene glycol and tetraethylene glycol. The catalyst is selected from at least one of sodium 5-nitro-o-methoxyphenolate, sodium o-nitrophenolate and sodium p-nitrophenolate. A nucleating agent solution is adopted to carry out texturing pretreatment on a silicon wafer, then alkali treatment texturing is carried out on the silicon wafer, and the liquid changing period of the texturing process is long; and the cell pieces prepared by taking the polyvinylpyrrolidone and the polyvinyl alcohol as the combined nucleating agent are relatively small in inter-piece color difference.

The invention discloses a method for synthesizing mesalazine and application of mesalazine. The method comprises the following steps: introducing p-nitrophenol, formic acid and a Cu-Co-coated MFI-NS molecular sieve catalyst into a continuous flow reaction zone, and sequentially carrying out electrophilic substitution and nitro hydrogenation cascade reaction at normal pressure and 50-70 DEG C; the catalyst has a micropore-mesopore stepped pore channel, and contains a Cu0 metal cluster and a framework Co < 2 + > acid site. And separating, acidifying and crystallizing the reaction liquid to obtain a finished product. According to the invention, the shape-selective selectivity and difunctional synergistic effect of the molecular sieve are utilized, high conversion rate (gt, 98%) and high selectivity (gt, 94%) under mild conditions are realized, the product purity is greater than or equal to 99.5%, and the Cu / Co residue meets the ICHQ3D standard. The catalyst can be recycled for 10 times or more, the yield is reduced by 5% or less, iron mud pollution of a traditional iron powder method and the metal leaching risk of a noble metal catalyst are thoroughly eliminated, and the method has the remarkable advantages of being environmentally friendly, efficient, low in cost, easy to industrially amplify and the like and is suitable for preparing the medicine for treating the inflammatory bowel disease.

The invention belongs to the technical field of catalyst technology and nitro-aromatic hydrocarbon selective hydrogenation, and discloses a method for preparing a CuxC-Ni3C-C composite catalyst by a carbonization reduction method and application of the CuxC-Ni3C composite catalyst. According to the preparation method, the CuxC-Ni3C-C composite catalyst is prepared by taking a nickel-copper mixed hydroxide as a precursor, C2H2 / Ar as a carbonization gas and H2 as a reduction gas for the first time, and CuxC promotes low-temperature synthesis of Ni3C. The method is easy and convenient to operate and simple in step. Compared with other methods, the method has the advantages that a high-temperature reaction process is avoided, and CuxC-Ni3C-C particles prepared at a lower temperature are small in size and uniform in distribution. The relatively low preparation temperature prevents particle aggregation and Ni3C high-temperature decomposition, so that the catalytic performance and stability of the catalyst are improved. Compared with catalysts such as CuxC, Ni3C, Cu, Ni and the like, the p-nitrophenol hydrogenation performance of the CuxC-Ni3C composite catalyst is remarkably improved.

The invention relates to the technical field of photocatalysts, in particular to a nonmetal plasmon heterojunction material, a preparation method and application thereof and a method for preparing p-aminophenol through reduction of p-nitrophenol. The nonmetal plasmon heterojunction material provided by the invention comprises a C3N4 nanosheet and a WO3-x nanoplate (x is 0.1 to 0.3) positioned on the surface of the C3N4 nanosheet. The WO3-x local surface plasmon characteristic can effectively expand the spectral response range of the non-metal plasmon heterojunction material in a visible region to a near-infrared region, and the light absorption efficiency of the non-metal plasmon heterojunction material is remarkably enhanced. The nonmetal plasmon heterojunction material provided by the invention can realize efficient reduction of p-nitrophenol based on the synergistic effect of an interface heterojunction, a built-in electric field and oxygen vacancies, is high in selectivity, has excellent photocatalytic activity for reduction of p-nitrophenol, and is excellent in photocatalytic activity stability.

The invention discloses a resin material for 3D printing and a preparation method thereof, and relates to the technical field of photosensitive resin materials. When the resin material for 3D printing is prepared, 3-isocyanate propyl methyl dimethoxy silane is blocked by p-nitrophenol, so that blocked 3-isocyanate propyl methyl dimethoxy silane is prepared; the preparation method comprises the following steps: carrying out condensation on blocked 3-isocyanate group propyl methyl dimethoxy silane, 3-mercaptopropyl methyl dimethoxy silane and hexamethyldisiloxane, so as to prepare blocked isocyanate group mercapto silicone oil; the preparation method comprises the following steps: loading a resorcinol bis (diphenyl phosphate) flame retardant on glass flakes modified by silane to prepare flame-retardant modified glass flakes; the preparation method comprises the following steps: reacting epoxy acrylate, blocked isocyanate sulfydryl silicone oil, acryloyl morpholine and a photoinitiator to prepare photosensitive resin, and compounding the photosensitive resin with flame-retardant modified glass flakes to prepare the resin material for 3D printing. The prepared resin has high mechanical property, flame retardant property and thermal stability.

The present invention belongs to the fields of solid waste resource recovery and high-value utilization, as well as catalytic technology, and particularly relates to a method for preparing a coal gasification slag-based supported NaA zeolite catalyst and its application. The present invention successfully loads metal oxides or elemental metals onto the NaA zeolite through the adsorption of heavy metal ions combined with a calcination treatment. The introduction of the metal active component significantly enhances the catalyst's catalytic performance, demonstrating excellent activity in the catalytic reduction of p-nitrophenol.

A preparation method of a Co@CM multi-channel ceramic catalytic membrane for hydrogenation of p-nitrophenol is provided. In the catalytic membrane, a multi-channel ceramic membrane is adopted as a substrate. A cobalt salt as an active component is loaded in situ on a surface and in pores of the multi-channel ceramic membrane through a forced circulation with the help of the excellent reduction and anchoring effects of dopamine (DA), and then subjected to in situ self-reduction through calcination to produce the Co@CM multi-channel ceramic catalytic membrane. The preparation method has the following advantages: Nano-scale Co particles are loaded instead of a precious metal on a multi-channel ceramic membrane, and the surface of the Co particles is wrapped by carbon and nitrogen, which can effectively inhibit the loss of Co particles during a reaction. In addition, there is no need to add an additional reducing agent during the reduction of Co.

The invention relates to the technical field of pesticide residue detection, in particular to a soil pesticide residue detection method which comprises the following steps: taking a soil sample to be detected, drying and grinding to obtain soil powder; mixing the soil powder with water, MgSO4 and an acetonitrile solution containing 2.5-3.5% of formic acid, carrying out vortex treatment, ultrasonic treatment and centrifugation, then collecting supernate, repeatedly extracting for one time, and then combining the supernate; and filtering the merged supernate by using a filter membrane, and analyzing by using an ultra-high performance liquid chromatography-triple quadrupole tandem mass spectrometry system. According to the method, extraction and chromatography-mass spectrometry conditions are optimized, 25 pesticide residues such as p-nitrophenol, imidacloprid and metabolites thereof can be detected at the same time, and the method has the advantages of being high in extraction efficiency, easy and convenient to operate, high in matrix interference resistance, high in sensitivity, good in accuracy and the like and is suitable for high-throughput detection and analysis of various pesticide residues in soil.

The invention belongs to the technical field of zinc content determination, and particularly relates to a method for determining zinc content by using a precipitation separation EDTA (Ethylene Diamine Tetraacetic Acid) dropping method, which comprises the following steps: S1, putting a sample into a beaker, and adding sodium fluoride, concentrated hydrochloric acid and concentrated nitric acid for dissolving; s2, purging a watch glass and a beaker, and adding water for dilution; s3, adding ammonium chloride, and neutralizing with ammonia water to precipitate; s4, adding anhydrous sodium sulfite, heating to slightly boil, and filtering with filter paper; s5, washing the beaker and the precipitate with an ammonium chloride washing solution, adding p-nitrophenol, and adjusting to be colorless; s6, adding an acetic acid-sodium acetate buffer solution, adding sodium fluoride and ascorbic acid, and uniformly mixing; s7, dropwise adding an indicator, and titrating with an EDTA standard solution; and S8, calculating. According to the method, one-step efficient separation of lead, iron and aluminum can be achieved, interference of lead residues on zinc determination is reduced, interference of coexisting ions is eliminated, and errors are obviously reduced.

The application discloses a preparation method of high-purity cephalosporin bipu ester side chain (1a), and a reaction route is shown as follows. The method is characterized in that 2a is used as a starting material to react with triphosgene to generate compound 3a, and then the compound 3a is used to react with p-nitrophenol to generate compound 1a. The product has high purity and high reaction yield, and is suitable for industrial production.

The invention belongs to the technical field of chemical detection, and particularly relates to a phosphoric acid column [5] arene modified nitrogen-doped quantum dot and a preparation method and application thereof in p-nitrophenol detection. The phosphoric acid pillar [5] arene modified nitrogen-doped quantum dot provided by the invention comprises a nitrogen-doped carbon quantum dot and phosphoric acid pillar [5] arene modified on the surface of the nitrogen-doped carbon quantum dot, and the structural formula of the phosphoric acid pillar [5] arene is as shown in formula 1. According to the phosphoric acid column [5] arene modified nitrogen-doped quantum dot provided by the invention, a P-CQDs (at) AO composite material can be constructed through fluorescence resonance energy transfer (FRET), so that fluorescence detection of p-nitrophenol is realized; meanwhile, electrochemical detection of p-nitrophenol can be realized through the electrochemical sensing electrode, so that fluorescence and electrochemical dual-channel detection of p-nitrophenol is realized, and the detection accuracy of p-nitrophenol is remarkably improved.

The invention belongs to the technical field of organic matter degradation, and discloses application of a nano-silver catalyst in organic dye catalytic degradation. According to the invention, methylene blue, methyl orange, p-nitroaniline and p-nitrophenol are taken as examples for experiments, and the four dyes start to degrade after reacting for a period of time. In the four dyes, the catalytic effect of methylene blue is worst, and the degradation degree within 20 minutes after the nano-silver catalyst synthesized by biotransformation of the blue-like bacteria FL15 is added can reach the degradation degree of reaction for 6 hours when the catalyst is not added; the effect of catalyzing the degradation of methyl orange is the best, and the degradation rate can reach 95% or above within 10 min; the degradation rate of paranitroaniline and paranitrophenol can reach 95% or above within 20 min. Therefore, the activity of the AgNPs mediated and synthesized by the endophytic fungi FL15 is relatively strong.

The invention relates to the technical field of chemical products, in particular to preparation and application of polysubstituted phenol intermediates, and discloses a green preparation method of polysubstituted phenol intermediates (such as p-nitrophenol and 2, 4-dinitrophenol), the core is that a chitosan-montmorillonite composite carrier is used for loading a nano zero-valent iron catalyst, and the nano zero-valent iron catalyst is used for preparing the polysubstituted phenol intermediates (such as p-nitrophenol and 2, 4-dinitrophenol). Efficient synthesis is realized through a normal-temperature and normal-pressure hydrolysis-reduction one-step method. The cost of the catalyst is reduced by 60% compared with that of the traditional supported catalyst, and the yield is still kept at 88.8% after the catalyst is repeatedly used for five times; by adding the dispersing agent, the substrate-catalyst contact area is increased, and the p-nitrochlorobenzene is high in conversion rate, high in yield and high in purity; by adopting a normal-temperature and normal-pressure process, the energy consumption is reduced by 40% compared with that of a high-temperature hydrogenation method, and the COD (Chemical Oxygen Demand) The method is suitable for the fields of medicines, pesticides, materials and the like, solves the problems of expensive catalyst, harsh conditions and heavy pollution in the prior art, and has a wide industrial prospect.

The application discloses a preparation and application of a Pt-embedded pudding structure of octahedral TFN-SnO2, and relates to the technical field of nanometer materials. The preparation method comprises the following steps: mixing a niobate aqueous solution, a SnCl2 aqueous solution and hydrofluoric acid, and carrying out hydrothermal treatment to obtain TFN (tin fluoride niobate); centrifuging and washing the TFN, and then dispersing the TFN in water; adding a H2PtCl6 solution to the TFN in water, and continuously stirring the mixture; centrifuging and washing the precipitate to obtain a Pt-TFN / SnO2 composite material. The Pt-embedded pudding structure of octahedral TFN-SnO2 can be obtained without a surfactant. The obtained octahedral Pt-TFN / SnO2 composite material has good catalytic activity in the reaction of reducing nitrophenol into p-aminophenol under alkaline conditions.

The present invention discloses a preparation method and application of a nitrogen-rich porous polymer. The preparation method uses cyanuric chloride and p-nitrophenol to synthesize a monosubstituted nitro-phenoxy dichloro-s-triazine, and then reacts with carbazole under the activation of n-butyllithium to obtain a novel nitro-phenoxy dicarbazolyl-s-triazine monomer containing triazine and carbazole groups. Under the catalysis of aluminum chloride and dimethoxymethane for crosslinking, a hypercrosslinked porous polymer is obtained. Further, the nitro group in the polymer backbone is catalytically hydrogenated and reduced by Pd / C to generate amino groups, resulting in a hypercrosslinked nitrogen-rich porous polymer. The preparation method of the present invention is novel and efficient, the reactants are inexpensive and easily available, and the pore rate of the porous polymer is large and the specific surface area is high; the prepared hypercrosslinked nitrogen-rich porous polymer contains abundant nitrogen-containing functional groups such as carbazole, triazine and amino groups, has good intermolecular interaction and electrostatic adsorption effect on dyes such as methyl orange, and has a high adsorption capacity and good removal effect on dyes such as methyl orange.

The invention provides a preparation method of 4-(3, 3-dichloroallyloxy) phenol, which comprises the following steps: 1) under an alkaline condition, dropwise adding 1, 1, 3-trichloropropene into a first system containing p-nitrophenol, and carrying out etherification reaction to obtain 1-(3, 3-dichloroallyloxy)-4-nitrobenzene; (2) carrying out reduction reaction on the 1-(3, 3-dichloro allyloxy)-4-nitrobenzene, so as to obtain 4-(3, 3-dichloro allyloxy) aniline; (3) carrying out diazotization reaction on the 4-(3, 3-dichloro allyloxy) aniline to obtain 4-(3, 3-dichloro allyloxy) benzene diazonium salt; 4, the 4-(3, 3-dichloro allyloxy) benzene diazonium salt is subjected to a hydrolysis reaction, and the 4-(3, 3-dichloro allyloxy) phenol is obtained.The preparation method of the 4-(3, 3-dichloro allyloxy) phenol is high in reaction selectivity and easy to operate, a solvent is environmentally friendly, and the production cost can be reduced.

The present invention describes the development of a nanometric platform highly sensitive to the presence of two potential water contaminants, hydrazine and p-nitrophenol. This platform is an electrochemical cell containing a graphite mine electrode modified with nanomaterials as the working electrode, a platinum counter electrode, and an Ag / AgCl / Cl (3M) reference electrode. To develop the working electrode for the electrochemical platform, the surface of the graphite electrode was modified with 1-pyrene carboxylic acid and reduced graphene oxide using the droplet deposition technique. Subsequently, the new active surface of the electrode was decorated with molybdenum disulfide (MOS2) nanoroses using the electrodeposition method. The results of the electrochemical study demonstrate the electrocatalytic properties of the nanomaterials used in the platform's development, as well as the strong correlation between current intensity and the concentration of the target analytes. This platform enabled the quantification of the two aforementioned analytes in real water samples with low detection limits of approximately 9.3 and 13.7 nM for hydrazine and p-nitrophenol, respectively.

The application discloses yolk-shell type CuO@MnO2 nano composite microspheres with a multi-point dispersion type inner core and a preparation method thereof. Organic carboxylic acid and copper salt are reacted in water, and after the reaction is completed, the organic copper carboxylate aqueous solution is filtered; after the solvent is removed, the organic copper carboxylate powder solid is obtained; the organic copper carboxylate powder solid is dissolved in a water and ethanol mixed solution; the silicon source ethanol solution is added for reaction; after the reaction is completed, the template agent is separated; the template agent is dispersed in a potassium permanganate solution; the reaction is heated under ultrasonic assistance; after the reaction is completed, the solid is placed in lye and heated to reflux; after centrifugal drying, the yolk-shell type CuO@MnO2 nanometer material with the multi-point dispersion type inner core is obtained by calcination. The yolk-shell type CuO@MnO2 nanometer material with the multi-point dispersion type inner core prepared by the application has the multi-point dispersion type CuO inner core in the MnO2 cavity, and has good application effect when applied to catalytic oxidative degradation of p-nitrophenol.

The invention belongs to the field of catalysis and bio-based chemicals, discloses a synthetic method for maleic acid, it is characterised in that furfural, electrocatalyst 4 acetylamino 2,2,6,6 tetramethylpiperidine 1 oxygen radical, photocatalyst 5,10,15,20 tetra (4 carboxylphenyl) porphyrin are added to carbonate buffer and placed in the anolyte compartment;p-nitrophenol is added to potassium hydroxide and / or sodium hydroxide aqueous solution and placed in the cathode compartment;Oxygen is continuously passed into the reaction solution of the anolyte compartment, photocatalytic reaction and electrolytic reaction are carried out synchronously under illumination conditions, and maleic acid is obtained in the anolyte compartment. The present invention overcomes the defects such as harsh chemical catalytic reaction conditions, high energy consumption, and has the advantages of mild reaction conditions, environmental friendliness, high synthesis efficiency, excellent selectivity and easy amplification.