46 results about "Benzidines" patented technology

The invention discloses a nano-enzyme-SERS (Surface Enhanced Raman Scattering) bifunctional sensor for detecting colorectal cancer markers with high sensitivity as well as a preparation method and application of the nano-enzyme-SERS bifunctional sensor. The preparation method comprises the following steps: coating a layer of platinum (Pt) on the surface of gold nanoparticles (AuNPs) by utilizing a chemical reduction method so as to form gold-platinum nanoparticles (Au (at) Pt NPs); assembling the synthesized Au (at) Pt NPs into an aminated capillary tube through electrostatic adsorption, so as to prepare a capillary tube SERS (Surface Enhanced Raman Scattering) substrate; the surface of Au (at) Pt NPs is modified with a marker aptamer through an Au-S bond, and the nano enzyme-SERS dual-function sensor is prepared. In the presence of hydrogen peroxide (H2O2), the Au (at) Pt NPs can catalyze the oxidation of 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) to generate oxidized TMB (oxTMB) with a strong SERS (Surface Enhanced Raman Scattering) signal. When Hcy exists, the reductive sulfydryl of Hcy consumes hydroxyl free radicals (. OH) generated by H2O2 decomposition, so that TMB oxidation is inhibited, and SERS signal intensity is weakened. A linear regression equation of the logarithm of the Hcy concentration and the signal intensity is drawn according to the SERS signal intensity, so that quantitative detection of the Hcy is realized.

The invention provides a high-entropy nano enzyme. The chemical formula of the high-entropy nano enzyme is Mn < 0.4 > Co < 0.4 > Ni < 0.4 > Cu < 0.4 > Zn < 0.4 > Fe < 2.0 >) O. The invention also provides a preparation method of the high-entropy nano-enzyme, which comprises the following steps: dissolving manganese nitrate tetrahydrate, cobalt nitrate hexahydrate, nickel nitrate hexahydrate, copper nitrate trihydrate, zinc nitrate hexahydrate and sodium citrate in deionized water to prepare a clear solution A; dissolving potassium ferricyanide in deionized water to prepare a clear solution B; directly pouring the solution B into the solution A, stirring, standing and aging the obtained mixed solution at room temperature, and centrifugally collecting a product; and calcining the sample powder in a muffle furnace to obtain the high-entropy nano-enzyme. The invention further provides a catalyst which is composed of the high-entropy nano enzyme, 3, 3 ', 5, 5'-tetramethyl benzidine and H2O2. The invention also provides a method for detecting reduced glutathione by using the microfluidic paper chip analysis device. The invention provides a new normal form for constructing a multifunctional biosensing and environment monitoring platform.

The present invention aims to provide polyimides and molded articles such as films that are environmentally safe, soluble in organic solvents, and have excellent transparency. [Solution] The above problem can be solved by a polyimide having a tetracarboxylic dianhydride component and a diamine component, wherein the diamine component includes a fluorine atom-containing diamine having a CF3-O- structure selected from 2,2'-bis(trifluoromethoxy)benzidine, 3,3'-bis(trifluoromethoxy)benzidine, and / or 2,3'-bis(trifluoromethoxy)benzidine, and the tetracarboxylic dianhydride component includes a tetracarboxylic dianhydride having a fluorene structure and an alicyclic tetracarboxylic dianhydride.

The invention discloses a polyamide semi-solid electrolyte, which comprises polyamide, a lithium salt and an electrolyte, wherein the polyamide is obtained by polymerizing polybasic acyl halide, 4, 4 '-diamino-2, 2'-bis (trifluoromethoxy) benzidine and a diamine monomer 1; the diamine monomer 1 is at least one of amino-terminated polyethylene glycol and amino-terminated polysiloxane. The invention also discloses a preparation method of the polyamide semi-solid electrolyte, which comprises the following steps: carrying out polymerization reaction on 4 '-diamino-2, 2'-bis (trifluoromethoxy) benzidine, a diamine monomer 1 and polybasic acyl halide in an organic solvent, and adding proline to remove HCl so as to obtain a polyamide solution; then adding lithium salt into the polyamide solution, and uniformly mixing to prepare a thin film; and soaking or wetting the thin film with an electrolyte to obtain the polyamide semi-solid electrolyte with high lithium salt content. The invention also discloses an application of the polyamide semi-solid electrolyte. The fabric has high ionic conductivity.

The invention provides a method for detecting the total antioxidant capacity of saliva based on iron-based MOF nano-enzyme, and belongs to the field of biosensing. The method comprises the following steps: obtaining an MIL-53Fe nano enzyme; the preparation method comprises the following steps: mixing a diluent of MIL-53Fe nano-enzyme, a sodium acetate buffer solution, 3, 3 ', 5, 5'-tetramethyl benzidine and hydrogen peroxide for reaction, adsorbing a reaction solution by using filter paper, drying and curing by using a chitosan solution to obtain the visual microfluidic detection paper-based chip. Establishing a standard curve of the chromatic value and the ascorbic acid concentration; dropwise adding the treated saliva sample onto the paper-based chip, standing for reaction to obtain a chromatic value, and calculating according to the standard curve to obtain the total antioxidant capacity value of the saliva. Complex matrix interference is broken through, the detection sensitivity and portability are improved, and therefore clinical application of saliva TAC detection in noninvasive health monitoring is promoted.

The invention discloses a pentagonal porphyrinyl covalent organic framework material as well as a preparation method and application thereof. According to the material, 5, 10, 15, 20-tetra (4-aminophenyl) nickel porphyrin and N, N '-bis (4-formylphenyl)-N, N'-diphenyl benzidine are used as construction units, and a two-dimensional covalent organic framework structure with pentagonal pore topological characteristics is formed through a Schiff base condensation reaction. Ni-N4 coordination structures which are uniformly distributed in the material construct catalytic sites similar to a natural enzyme active center in a non-uniform pore microenvironment, and the material shows excellent and stable peroxidase-like catalytic activity. The preparation method of the material has the advantages of clear process steps and mild reaction conditions, and is suitable for stable and repeated preparation. A catechol inhibition type colorimetric sensing system constructed on the basis of the material has good analysis performance in the aspects of detection linear range, detection limit and the like and does not need to depend on large-scale instruments and equipment, and a detection result can be observed through naked eyes.

This invention provides a diazobiphenyl dye for thin-film polarizers, which is an analog of AD1. Thin-film polarizers prepared using this dye exhibit good optical quality, such as low light scattering, high dichroism ratio, broadband absorption, and / or stability to heat and light irradiation. This invention also provides a method for preparing the diazobiphenyl dye from two different monoazo dyes via a cross-coupling reaction. This method is eco-friendly because it does not use toxic benzidine as a raw material. The product (diazobiphenyl dye) obtained by this method can be purified in a simple and convenient manner, and the diazobiphenyl dye prepared by this method can have a symmetrical or asymmetrical structure. Furthermore, this invention provides a thin-film polarizer comprising the diazobiphenyl dye and an apparatus for display applications comprising the thin-film polarizer.

The application discloses an electrochemical biosensor based on specific nucleic acid aptamer fragments and glucose oxidase. The specific recognition of the same target object by the double nucleic acid aptamer is utilized to combine the modified metal organic framework compound and the magnetic nanoparticles with the target object to form a self-assembly structure, and the magnetic nanoparticles are separated out by utilizing the magnetism of the magnetic nanoparticles. Meanwhile, the specific catalytic action of the glucose oxidase on glucose produces hydrogen peroxide to further oxidize 3,3'-diamino benzidine to generate an electrochemical signal, and the metal organic framework compound and the magnetic nanoparticles both have peroxidase-like activity, which can further synergistically catalyze the oxidation of 3,3'-diamino benzidine by hydrogen peroxide, and the sensitivity is improved. Thus, based on the linear relationship between different concentrations of pathogen solutions and corresponding electrochemical signal intensities, the electrochemical biosensor realizes high-sensitivity detection of the hyacinth yellow rot fungus.

The invention discloses a nanogold and wood composite material, a preparation method, application and a method for determining the content of glucose in reconstituted tobacco, glucose oxidation is directly catalyzed through the nanogold and wood composite material (AuNPs and wood), the glucose and tetramethyl benzidine (TMB) are subjected to a chromogenic reaction, and the content of the glucose in the reconstituted tobacco is determined by combining the linear relation between absorbance and the glucose concentration. And whether the glucose exists in the reconstituted tobacco and the concentrated solution sample or not and the specific content of the glucose can be accurately judged. The method provided by the invention can quickly obtain a detection result within 30 minutes, is suitable for efficiently screening reconstituted tobacco and concentrated solution samples with the glucose content lower than 0.01 gL <-1 >, can accurately determine the actual content of glucose in the reconstituted tobacco and the concentrated solution, does not need to depend on a standard substance or carry out modeling maintenance, and is simple and convenient to operate. The equipment cost is obviously reduced; and the operation process is simplified.

The invention provides a silane coupling polymer membrane for H2 / CO2 separation as well as a preparation method and application of the silane coupling polymer membrane. Soaking the support body in a 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane aqueous solution, taking out the support body, and naturally airing the support body until no obvious liquid drops exist on the surface of the support body; soaking the support body in a mixed water phase solution containing 3, 3 '-diaminobenzidine and melamine, removing redundant water phase solution after a period of time, and naturally airing; then soaking in a mixed organic phase solution containing paraphthaloyl chloride and trimesoyl chloride, and carrying out interfacial polymerization reaction on amino and acyl chloride on the surface of the support body to generate an initial polymer membrane; and then putting into a drying oven for heat treatment to obtain the final silane coupled bibenzimidazole and amide connected polymer film. The H2 permeability of the membrane under the conditions of 200 DEG C and 1 bar is 225 GPU, and the H2 / CO2 selectivity is 101. The method is simple to operate and short in preparation period; the gas separation performance is excellent at high temperature and high pressure, and large-scale preparation is easy.

The invention belongs to the technical field of biosensors, and discloses a preparation method and application of a polyacid / hydrotalcite composite mimic enzyme. According to the invention, the P2W18O62 / CoAl-LDH composite material is prepared and is applied to the colorimetric reaction process of 3, 3 ', 5, 5'-tetramethyl benzidine, so that the detection of H2O2 and AA is realized. AA can be used as a reducing agent in the system and can reduce blue oxTMB into colorless TMB. On the basis, a rapid and sensitive TMB / H2O2 / P2W18O62 / CoAl-LDH colorimetric sensing system is established to detect the AA. The linear detection range of AA is 10 to 50 mol / L, and the detection limit is 12.5 mol / L. The sensing system shows excellent selectivity, and the TMB / H2O2 / P2W18O62 / CoAl-LDH sensing system is used for detecting the AA in an actual fruit sample.

The present invention aims to provide polyimides and molded articles such as films that are environmentally safe, soluble in organic solvents, and have excellent transparency and mechanical properties. [Solution] The above problem can be solved by a polyimide having a tetracarboxylic dianhydride component and a diamine component, wherein the diamine component includes a fluorine atom-containing diamine having a CF3-O- structure selected from 2,2'-bis(trifluoromethoxy)benzidine, 3,3'-bis(trifluoromethoxy)benzidine, and / or 2,3'-bis(trifluoromethoxy)benzidine, and the tetracarboxylic dianhydride component includes an acid dianhydride having an ether bond and an alicyclic tetracarboxylic dianhydride.

The application relates to the technical field of titanium dioxide, and discloses a preparation process of surface-modified porous titanium dioxide and application thereof. The porous titanium dioxide has a large number of pore structures, a large specific surface area, and many adsorption sites, and is grafted with a hydroxyl-containing histidine-based polyamide containing a salicylaldehyde Schiff base structure, an imidazole structure and a polyamide structure, can have a strong coordination with Pb 2+ , Hg 2+ , and thus has excellent adsorption performance. 3,3'-diamino-benzidine is used as a polymerization monomer, the benzidine structure has heat resistance, the benzidine structure is introduced into the main chain of the polyamide after polymerization, the polyamide has excellent high-temperature resistance, the polyamide molecular chain does not pyrolyze at high temperature, the surface-modified porous titanium dioxide adsorbent still has high adsorption efficiency, and the surface-modified porous titanium dioxide adsorbent can meet the actual application of the adsorbent in the treatment of wastewater in a complex system such as high temperature.

The invention relates to the technical field of chemical engineering separation, and discloses a method for purifying a 3, 3 '-diaminobenzidine crude product and application, the method comprises the following steps: (1) mixing the 3, 3'-diaminobenzidine crude product with a good solvent for the first time to obtain a solution containing 3, 3 '-diaminobenzidine; wherein the good solvent comprises an organic matter containing a nitrogen element and / or an organic matter containing a sulfur element; (2) carrying out second mixing on a solution containing 3, 3 '-diaminobenzidine and a solventing-out agent; wherein the solventing-out agent comprises water and / or monohydric alcohol; and (3) aging the product obtained by the second mixing, then carrying out second solid-liquid separation on the product obtained by the aging, and washing and drying the solid obtained by the second solid-liquid separation. The method provided by the invention has the advantages of mild conditions, no need of nitrogen protection and low solvent consumption, and the 3, 3 '-diaminobenzidine product with high purity and high yield can be obtained only through one-step crystallization.

The invention provides a multifunctional nano material Ni-MoS2 (at) Au for detecting trace toxic substances in mushrooms and a preparation method of the multifunctional nano material Ni-MoS2 (at) Au. The nano material is prepared from a metal oxide, a surfactant, precious metal nano particles and a solvent, the nano material has colorimetric and Raman detection functions on various trace toxic substances (mercury ions and amanita peptide) in mushrooms, hydrogen peroxide is immediately catalyzed to quickly oxidize 3, 3 ', 5, 5'-tetramethyl benzidine into yellow 3, 3 ', 5, 5'-tetra (tetrafluoromethyl) phenyl diamine oxide after the nano material is in contact with a target object Hg < 2 + > for 1s in a colorimetric mode, the nano material has an extremely low detection limit of 0.036 mu g / mL, and the nano material can be used for detecting various trace toxic substances (mercury ions and amanita peptide) in mushrooms. The catalyst has good selectivity and is not interfered by other heavy metal ions; in a Raman mode, high-sensitivity detection of alpha-amanita peptide and beta-amanita peptide can be realized, and the detection limit ranges are 10 <-4 > M to 10 <-8 > M. The nano material provides a reference mode capable of detecting multiple target objects in the same system, and opens up a new way for a detection strategy of trace toxic substances in the field of food safety detection.

The invention discloses a method for detecting vitamin B1 and glyphosate by a nano-enzyme base, which comprises the following steps of: preparing Cu2O / Mn under ultraviolet irradiation by taking Cu2O as a template and manganese ions as donors, preparing Mn-tetra (4-carboxyphenyl) porphyrin (TCPP) nano-enzyme (Cu2O / Mn at TCPP) with weak pseudoperoxidase activity by a hydrothermal method, and enhancing the affinity between the Cu2O / Mn at TCPP and a substrate 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) by vitamin B1 (VB1), more hydroxyl radicals (. OH) are generated, the activity of pseudoperoxidase is remarkably enhanced, and colorless TMB is oxidized to generate a blue solution; due to the interaction of glyphosate and vitamin B1, the addition of glyphosate can effectively inhibit the affinity interaction of VB1 and TMB, thereby inhibiting the catalytic oxidation reaction; according to the present invention, with the increase of the VB1 concentration, the absorbance of the solution is linearly increased, and with the increase of the glyphosate concentration, the absorbance is linearly reduced, such that the new VB1 and glyphosate detection method is established, the detection limits are respectively 0.20 mg / kg and 0.01 mg / kg, and the detection method has characteristics of strong specificity and no interference of other vitamins and pesticides.

The invention belongs to the technical field of environmental pollutant detection and treatment, and provides a method for detecting and degrading tetracycline by aptamer-modified fluorescent nano-enzyme, which comprises the following steps: firstly, synthesizing an iron-based metal organic framework through hydrothermal synthesis, and coupling with a tetracycline aptamer to construct a nano-enzyme material with endogenous fluorescence and catalytic activity; then, utilizing the aptamer to specifically recognize fluorescence measurable change initiated by tetracycline under a weak acid condition, and establishing a standard curve to realize rapid quantification; tetramethyl benzidine is used as a substrate to verify the peroxidase-like activity of the compound; after detection is completed, hydrogen peroxide is added into the same system, hydroxyl radicals are generated through iron site valence cycle, and tetracycline is subjected to in-situ oxidative degradation. The method is high in sensitivity, strong in interference resistance and simple and convenient in process, the degradation rate within two hours is about 90%, and the method is suitable for on-site'detection-treatment 'integrated application of a water body, aquaculture wastewater and other complex matrixes.

The invention provides a rapid starch content detection kit and application thereof, and belongs to the technical field of food detection.The kit comprises a reaction microwell plate with glucose oxidase and horse radish peroxidase fixed in reaction microwells, amylase working fluid containing alpha-amylase, BSA and amylase diluent, and a reaction microwell plate with glucose oxidase and horse radish peroxidase fixed in reaction microwells, the saccharifying enzyme working solution consists of saccharifying enzyme, BSA (Bovine Serum Albumin) and saccharifying enzyme diluent; and the substrate solution contains tetramethyl benzidine. The starch content detection scheme provided by the invention has the characteristics of simple treatment steps, short time consumption, high specificity, high sensitivity, high accuracy and the like.

The application discloses a hydrogel preparation method based on Hofmeister effect and application in color-changing contact lenses, and comprises the following steps: mixing a blue oxidation state 3,3',5,5'-tetramethyl benzidine solution with an agarose solution, rapidly reacting through microwave, mold pressing and cooling to form a blue contact lens; uniformly coloring the prepared blue contact lens with Hofmeister salt through simple drop or soaking method; and cleaning the colored contact lens. The color-changing contact lens prepared by the preparation method effectively avoids the high production cost and the safety problem of uneven lenses caused by using printing coloring technology, breaks through the fixed limitation that the color of the existing color contact lens cannot be changed once produced, and provides a novel color-changing mechanism and a reliable color-changing method for the current color-changing contact lens market.

The invention discloses a graphene anticorrosive coating, a preparation method thereof and a refrigerator, and belongs to the technical field of non-ferrous metal protection. The graphene anticorrosive coating is composed of benzidine-disuccinimido suberic acid ester modified graphene, and the benzidine-disuccinimido suberic acid ester is combined with the graphene through a pi-pi conjugation effect. The graphene anticorrosive coating is applied to protection of the copper electrode for the refrigerator, the problem that an existing graphene coating for corrosion prevention of the copper electrode cannot give consideration to corrosion prevention performance and conductivity is solved, and the graphene anticorrosive coating has good toughness, excellent corrosion prevention effect and high conductivity.

The present invention provides an optical film and a display device including the same, the optical film including a polymer resin including: a first repeating unit; a second repeating unit; a third repeating unit; and a fourth repeating unit, wherein the first repeating unit is an imide repeating unit from a first diamine-based compound and a dianhydride-based compound, the second repeating unit is an imide repeating unit from a second diamine-based compound and a dianhydride-based compound, the third repeating unit is an amide repeating unit from the first diamine-based compound and a dicarbonyl-based compound, and the fourth repeating unit is an amide repeating unit from the second diamine-based compound and a dicarbonyl-based compound. The first diamine-based compound is 2,2'-bis(trifluoromethyl)benzidine (TFDB), the second diamine-based compound includes an aromatic diamine-based compound, and the number of the amide repeating units including the third and fourth repeating units is at least 80% of the total number of repeating units including the first to fourth repeating units.

The invention discloses a preparation method and application of a polybenzimidazole membrane containing double ion exchange groups, and the preparation method comprises the following steps: firstly, synthesizing an ammonium bromide-containing monomer by using 1, 6-dibromohexane, a tertiary ammonium group-containing reagent and ethyl acetate as raw materials; secondly, carrying out condensation polymerization on a dicarboxylic acid monomer and diaminobenzidine in methanesulfonic acid and P2O5 to prepare a polybenzimidazole polymer; then, the obtained polybenzimidazole polymer and 2, 3-epoxypropyl trimethyl ammonium chloride are subjected to a grafting reaction in dimethyl sulfoxide, then the ammonium bromide-containing monomer is introduced for continuous reaction, and a dicationic polybenzimidazole polymer is obtained; the dicationic polybenzimidazole polymer is dissolved in dimethyl sulfoxide, film casting and drying are carried out, and the polybenzimidazole membrane which has high ionic conductivity and contains double ion exchange groups can be obtained. The polybenzimidazole membrane constructed by the invention is applied to an electro-catalysis CO2 reduction system, and the current density and CO Faraday efficiency can be remarkably improved.

The application belongs to the technical field of sensors, and provides a biosensor for detecting Escherichia coli, which comprises AuNRs modified with H1 hairpin and H2 hairpin, a hairpin probe HAP, an S-T composite probe, hematin, potassium ions, H2O2 and tetramethyl benzidine; the nucleotide sequences of the hairpin probe HAP, the H1 hairpin and the H2 hairpin are shown in SEQ ID NO:1-3; the S-T composite probe is formed by complementary pairing of an S chain and a T chain with the nucleotide sequences shown in SEQ ID NO:4-5; and the H1 hairpin and the H2 hairpin are electrostatically adsorbed on the surface of the AuNRs. The biosensor provided by the application has high reaction efficiency, good specificity and low detection limit, and is suitable for qualitative and quantitative determination of the number of Escherichia coli.

The present application relates to a kind of polybenzidine nanofiber and its preparation method, the polybenzidine nanofiber length is 43~67 μm, and the length-diameter ratio is 120~256.Its preparation method is as follows: benzidine is dissolved in solvent, when the system pH value is 3~6, benzidine and hydrogen peroxide occur oxidation polymerization reaction under the catalysis of divalent copper salt to obtain polybenzidine nanofiber.The polybenzidine nanofiber provided by the present application morphology is regular and controllable and has high length-diameter ratio, and conductivity is high, as a kind of semiconductor high polymer material has potential application prospect in battery, supercapacitor.

The invention discloses a biological tissue cell autofluorescence elimination agent and a use method, the autofluorescence elimination agent is composed of an autofluorescence elimination agent component A solution and an autofluorescence elimination agent component B solution, and a solvent is a hydrophilic solvent; the autofluorescence eliminating agent component A is one or a combination of more of phosphomolybdic acid, sodium molybdate, Bingsnow delala green leuco base, 3, 3 ', 5, 5'-tetramethyl benzidine and Sudan black B; the autofluorescence eliminating agent component B is one or a combination of more of stannous chloride, ascorbic acid, sodium pyrosulfite, salvianol B, tris (2-carboxyethyl) phosphine hydrochloride, p-phenylenediamine, polyvinylpyrrolidone K3, sodium polyethylene sulfonate and polyethylene glycol. The method is used for shielding autofluorescence generated by red blood cells, collagen, elastin, aldehyde immobilization and the like, non-specific signal interference is reduced, and the signal-to-noise ratio and sensitivity in fluorescence experimental analysis are improved.

The present invention relates to a polyamideimide, and a resin composition comprising a polyamideimide and an acrylic resin. The polyamide-imide has a diamine component, a tetracarboxylic acid dianhydride component, and a polybasic acid component, and contains, as the diamine component, a diamine having one or more structures selected from the group consisting of CF3-O-,-(CF2-O) n-, and-O-(CF2-CF2-O) n-(where n is an integer of 1-20), and preferably, as the diamine, 2, 2 '-bis (trifluoromethoxy) benzidine, 3, 3'-bis (trifluoromethoxy) benzidine, or 2, 3 '-bis (trifluoromethoxy) benzidine. And 3, 3 '-bis (trifluoromethoxy) benzidine and the like.

The invention discloses a sensing material for distinguishing thiophene sulfides and a distinguishing detection method, and the sensing material is prepared from the following components in parts by weight: each 1.5 mL of the sensing material contains 0.0018 to 0.002 mg of a PtFe nano material, 0.10 to 0.15 mg of 3, 3 ', 5, 5'-tetramethyl benzidine and 0.50 to 0.55 mg of H2O2. The method for distinguishing and detecting the thiophene sulfides comprises the following steps: (1) mixing a PtFe nano material with 3, 3 ', 5, 5'-tetramethyl benzidine and H2O2 in more than two pH environments, adding different types of thiophene sulfides to obtain different absorbance values under 652nm, and generating an LDA distinguishing map and a clustering heat map on the basis of obtained characteristic absorbance data; and (2) carrying out parallel experiments on thiophene sulfides to be distinguished according to the experimental parameter flow in the step (1), matching data of a sample to be detected with reference data, and distinguishing and identifying the thiophene sulfides to be detected by combining LDA analysis and a clustering heat map visualization result. According to the invention, thiophene sulfide can be distinguished, and identification application in air pollutants is manifested.

The invention discloses a preparation method of light-resistant, high-covering and high-tinting-strength benzidine yellow. The preparation method comprises the following steps: S1, preparing a benzidine yellow pigment raw material through a coupling reaction; s2, adding a benzidine yellow pigment raw material, a pigment dispersion synergist and an ultraviolet protective agent into an organic solvent, fully stirring and uniformly mixing, slowly heating to 100-110 DEG C, stirring and preserving heat for 2-3 hours, slowly heating to 120-125 DEG C, stirring and preserving heat for 1-2 hours, slowly heating to 130-150 DEG C, stirring and preserving heat for 6-8 hours, cooling a reactant to room temperature, and filtering to obtain the benzidine yellow pigment. According to the mass of dry powder of the addition amount of the benzidine yellow pigment raw material, the addition amount of the pigment dispersion synergist is 0.1-10%, and the addition amount of the ultraviolet protective agent is 1-10%. The benzidine yellow pigment prepared by the invention has obvious covering power and good light fastness, and the tinting strength is slightly improved.

The application belongs to the technical field of colorimetric detection, and particularly relates to application of a high-entropy sulfide nano-enzyme material in colorimetric analysis and detection of sulfadiazine. The application uses metal nitrates of Fe, Co, Cu, Cr and Zr and TAA as raw materials to synthesize a five-element high-entropy sulfide nano-enzyme material (F3CZ-48). The F3CZ-48 is used as a colorimetric analysis and detection method with peroxidase activity based on tetramethyl benzidine (TMB) as a chromogenic substrate, and a new method for detecting sulfadiazine (SD) is established. The F3CZ-48 has high stability, easy storage, low cost, excellent catalytic performance and rich reaction sites. By fitting the change of UV-Vis intensity with the concentration of SD, a linear calibration curve with a correlation coefficient of 0.993 is obtained, and the detection limit is 0.121 muM (S / N=3). The material has good sensitivity, selectivity and reproducibility for colorimetric detection of SD, and provides a new scheme for designing a new catalyst for detecting SD.

The present application relates to wastewater neutralization technical field, specifically to a kind of 3,3'-dichlorobenzidine hydrochloride neutralization wastewater treatment system and processing method, including neutralization tank, stirring unit, discharge pipe, PH sensor, liquid level sensor and cleaning assembly, cleaning assembly includes two filter plates, circulating pump, transfer unit and multiple first spray head, liquid is discharged from neutralization tank, and the filter cake, impurities or suspended solids are filtered through filter plate;Filtrate is transported to transfer unit by circulating pump;Filtrate is sprayed from multiple first spray head, and the filter cake, impurities or suspended solids adhered inside neutralization tank are washed down uniformly;Thus, the filtrate after neutralization is discharged and filtered, then the filter cake, impurities or suspended solids adhered are washed by using filtered filtrate backflow to neutralization tank, and then repeatedly circulating filtration, the filter cake, impurities or suspended solids inside are cleaned, and the quality of subsequent catalytic oxidation is greatly improved.