375 results about "Thiocyanic acid" patented technology

The invention relates to a composite nanodot loaded porous carbon nitride photocatalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: calcining a precursor formed by mixing melamine, cyanuric acid and trithiocyanuric acid to obtain porous carbon nitride, and loading cobalt oxide nanodots and nickel nanodots on the porous carbon nitride in two steps, the composite nanodot loaded porous carbon nitride photocatalyst with excellent visible light catalytic hydrogen production performance is obtained; when the composite nanodot loaded porous carbon nitride photocatalyst obtained by the method is used for photocatalytic hydrogen production, an activity test result shows that the activity of the photocatalyst prepared by the method is improved by 222.5 times compared with that before modification; the preparation method disclosed by the invention has the advantages of high reaction efficiency and good performance of the obtained photocatalyst, and has a wide application prospect.

The invention discloses an antistatic polyester fiber and a preparation method thereof, and relates to the field of fibers. When the antistatic polyester fiber is prepared, N, N-dimethylethanolamine reacts with allyl chloride, and then dichloro phthalocyanine silicon is grafted to obtain modified silicon phthalocyanine; polymerizing terephthalic acid, itaconic acid and ethylene glycol, and reacting with fluorescein isothiocyanate and modified silicon phthalocyanine in sequence to obtain modified polyester chips; the preparation method comprises the following steps: reacting phosphonitrilic chloride trimer with 3-hydroxy-5-nitropyridazine, and reducing to obtain a flame retardant; and carrying out melt spinning on the modified polyester chips and a flame retardant, and reacting to obtain the antistatic polyester fiber. The antistatic polyester fiber prepared by the invention has excellent antistatic property, antibacterial property, flame retardance and mechanical property.

The invention belongs to the technical field of analytical chemistry detection, and particularly relates to a construction method and application of a tobacco mosaic virus molecular imprinting sensor based on MIL-101 (Fe). The construction method comprises the following steps: by taking a tobacco mosaic virus TMV as a template virus, preparing a molecularly imprinted polymer MIPs with a TMV specific recognition cavity on the surface of MIL-101 (Fe) through a free radical polymerization reaction; the template virus is removed in the preparation process of the molecularly imprinted polymer MIPs, and a TMV specific recognition cavity of the molecularly imprinted polymer MIPs contains MIL-101 (Fe); the molecularly imprinted polymer MIPs is the tobacco mosaic virus molecularly imprinted sensor based on MIL-101 (Fe). Hydrochloric acid is introduced, so that the TMV specific recognition cavity structure of the molecularly imprinted polymer MIPs is cracked to release Fe < 3 + >, then potassium thiocyanate is added, and the Fe < 3 + > and KSCN are subjected to a complexation reaction to generate a red complex. And the complexation reaction of Fe < 3 + > and KSCN is used as a signal probe, the rapid semi-quantitative visual detection of the target virus TMV by naked eyes is realized, and quantitative detection and analysis are carried out through an ultraviolet spectrophotometer.

The invention provides a metal plate frame and fluororubber sealing assembly and a preparation method thereof, and the preparation method is applied to the technical field of semiconductor sealing and comprises the steps that S1, a metal plate frame is coated with an adhesive, dried and then cooled, and the adhesive is a trithiocyanuric acid derivative solution; s2, a cross-linking agent and an addition agent are added in the thin-passing mixing process of the perfluoroether elastomer, a mixed rubber compound is obtained, the addition agent comprises fluorinated silicon dioxide, fluorinated titanium dioxide or PFA micro powder, and the mass of the addition agent is 2-10% of the mass of the perfluoroether elastomer; and S3, the mixed rubber sheet is placed in a metal plate frame, the metal plate frame with the mixed rubber sheet is placed in a mold to be subjected to hot pressing vulcanization forming, then secondary vulcanization is conducted, then radiation vulcanization is conducted, and the assembly is obtained. The assembly prepared through the method is resistant to plasma etching and high in cleanliness, the bonding performance of the perfluoroether rubber and the metal plate frame is good, and the rate of finished products is high.

The invention relates to the technical field of hydrometallurgy production systems, in particular to a solvent regeneration control system for separating zirconium and hafnium through MIBK method centrifugal extraction, which comprises a control module used on a solvent regeneration neutralization reactor, and the control module comprises a heat exchange module; the heat exchange module comprises a heat exchange unit; the heat exchange unit comprises a cooling liquid flow adjusting unit, a cooling liquid temperature detecting unit and a cooling liquid pressure detecting unit. And the heat exchange module is used for controlling the flow of the cooling liquid, the pressure of the cooling liquid and the temperature of the cooling liquid of the heat exchange unit so as to adjust the temperature of the mixed phase in the neutralization reactor. The control system can monitor the flow, temperature and pressure of cooling liquid in real time, accurately control opening, closing and temperature adjustment of the heat exchange unit, quickly respond to temperature change of a mixed phase in the neutralization reactor, remove reaction heat in time, effectively avoid the problem of extraction system emulsification caused by high-temperature decomposition and polymerization of thiocyanic acid in the solvent regeneration process, and improve the extraction efficiency. The solvent regeneration efficiency and quality are ensured.

The invention discloses premixed flow-state solidified soil and a preparation method thereof, and the premixed flow-state solidified soil comprises the following components in parts by weight: 100 parts of silty clay; 8 to 15 parts of a curing agent; 48 to 90 parts of water; wherein the curing agent comprises the following components: 10 to 15 parts of sulphoaluminate cement; 40 parts to 55 parts of superfine steel slag powder; 30 to 40 parts of fly ash; 0.5 to 1.5 parts of sodium silicate; 0.1 to 0.3 part of a foaming agent; 0.1 part to 0.2 part of sodium thiocyanate; 0.1 part to 0.2 part of hydroxymethyl cellulose; 0.05 part to 0.2 part of triisopropanolamine; 0.1 part to 0.5 part of calcium nitrate; and 0.5 to 1 part of a polycarboxylic acid water reducing agent. The preparation method of the premixed flow-state solidified soil is suitable for using silty clay as a raw material, and greatly improves the strength, compactness, fluidity and other properties of the premixed flow-state solidified soil.

The invention discloses a preparation method of a low-chlorine composite environment-friendly coal transportation anti-freezing agent, and belongs to the technical field of anti-freezing solutions. The anti-freezing solution is used for solving the technical problems of complex components and poor anti-freezing and metal corrosion resistance of the anti-freezing solution for coal transportation in the prior art. The preparation method of the low-chlorine composite environment-friendly coal transportation anti-freezing agent comprises the following step: uniformly mixing the compound pour point depressant, the modified corrosion inhibitor, the thickening stabilizer and the industrial water to prepare the low-chlorine composite environment-friendly coal transportation anti-freezing agent. The compound pour point depressant comprises an organic pour point depressant and an inorganic pour point depressant; the organic pour point depressant is obtained by reacting unsaturated azole, sodium methallyl sulfonate and fumaric acid; the unsaturated nitrogen is obtained by reaction of an intermediate B and benzaldehyde, and the intermediate B is obtained by reaction of triazole and ethyl chloroacetate; the modified corrosion inhibitor is obtained by carrying out a reaction on potassium thiocyanate, benzoyl chloride and chitosan vanillin Schiff base. The anti-freezing solution prepared by the invention has the advantages of moderate fluidity, good metal corrosion resistance and good anti-freezing performance.

The invention discloses lithium sulfide, a two-step double decomposition preparation method and application of the lithium sulfide in an all-solid-state battery, and belongs to the technical field of solid-state batteries. According to the preparation method, a two-step decomposition synthesis technology is adopted, lithium carbonate and ammonium thiocyanate are used as raw materials, the raw materials are uniformly mixed and then placed in a high-temperature reactor, a step heating sintering procedure is completed in an inert gas atmosphere, and the purpose of fully decomposing and converting the raw materials is achieved by accurately controlling the temperature and the time; after a product is obtained through reaction, the high-purity lithium sulfide material is obtained after the product is cooled to the room temperature. The method for preparing the lithium sulfide is low in raw material cost, simple in reactant formula and free of side reaction in the reaction process, and the finally generated product is few in impurity, high in purity and good in crystallinity.

The invention relates to the technical field of sewage treatment in environmental protection, in particular to a high-valence metal cation composite remover and a use method of the high-valence metal cation composite remover. The polyhydroxy compound, the polycarboxyl compound and the polyamido compound are one or more than two of dithiomethyl carbamate, dithioethyl carbamate, dithiopiperazine dicarboxylate, trithiocyanate, hyperbranched vinylamine dithiocarbamate and dodecyl sulfonate, and the polyhydroxy compound, the polycarboxyl compound and the polyamido compound are one or more than two of dithiomethyl carbamate, dithioethyl carbamate, dithiopiperazine dicarboxylate, trithiocyanate, hyperbranched vinylamine dithiocarbamate and dodecyl sulfonate; the inorganic matter is one or more than two of silicate, phosphate and carbonate. According to the method, after the ammonia water is added, the composite removing agent is added for reaction and precipitation, the method has the advantages that the technological process is simple, the agent adding amount is small, the removal rate of high-valence metal cations reaches 99.9% or above, the operation cost is low, the pH value in the process is low, ammonia volatilization waste is inhibited and controlled, and the problems of safety and environmental protection are solved, and the method is suitable for industrial production.

The invention discloses synchronous test paper for Fe < 3 + > and Fe < 2 + > as well as a preparation method and application of the synchronous test paper, and effectively solves the problem that high-concentration Fe < 3 + > and Fe < 2 + > in a boiler chemical cleaning solution are difficult to rapidly, accurately and simultaneously detect. The detection test paper is provided with isolated first and second color developing regions, provides an independent space for Fe < 3 + > and total iron detection, and is anti-interference and accurate. A potassium thiocyanate-hydrochloric acid color developing agent is specially used for measuring Fe < 3 + > in the first color developing area, a phenanthroline-ascorbic acid color developing agent is used for measuring total iron in the second color developing area, and the concentration of Fe < 2 + > is calculated in a combined mode. A standard colorimetric card is matched, color blocks accurately correspond to the concentration range (0-5000 mg / L), the common iron ion concentration is covered, and a comparison basis is provided for detection. During detection, information can be rapidly and visually obtained by comparing the color of the color developing area with the color chart, operation is easy and convenient, complex equipment and professionals are not needed, and field requirements are met. And the scheme is resistant to interference of high-concentration and complex components, and the result is real and reliable.

The application discloses a low-alkalinity inhibitor for pyrite in secondary copper-sulfur ore and a method. The method comprises the following steps: adding trisodium trithiocyanate in the process of ore grinding; and adding a second inhibitor to adjust the pH value of the ore slurry to 9.5-10.5 in the process of flotation. The second inhibitor is calcium oxide and an organic copolymer, the organic copolymer is an acrylamide-acrylic acid-maleic anhydride copolymer, and the molecular weight of the organic copolymer is 5000-10000. The method can reduce the activation of copper ions on pyrite, realize low-alkalinity inhibition of pyrite, and avoid problems such as high pH value of mineral processing waste water, easy pipe blockage, and low recovery rate of precious metals.

The invention discloses a preparation method of a polymer carbon nitride / tin sulfide (PCN (at) SnS2) heterojunction photoanode, which comprises the following steps of: constructing the PCN (at) SnS2 heterojunction photoanode in situ on a conductive substrate (FTO) by combining an electrochemical deposition method and a chemical vapor deposition method, adding anhydrous stannous chloride into ethanol for dissolving, spin-coating stannous ions on the surface of the conductive substrate, and oxidizing in an air atmosphere; the preparation method comprises the following steps: adding stannous sulfate and sodium citrate into deionized water, and stirring for dissolving; the prepared conductive substrate is used as a working electrode, and a tin film is deposited on the surface of the conductive substrate by adopting a three-electrode system; dicyandiamide, cyanuric acid and potassium thiocyanate are ground and mixed evenly and then put into a porcelain boat, and the conductive substrate deposited with the tin film is placed on the surface of the precursor and wrapped with aluminum foil; placing the porcelain boat in a tubular furnace, reacting in a nitrogen atmosphere, and cooling to room temperature to form PCN-coated SnS2 on the surface of the FTO. The method improves the problems of insufficient light absorption range and high electron-hole recombination rate of the polymer carbon nitride material, and has the advantages of simplicity, controllability and the like.

The invention relates to the technical field of perovskite, and discloses a perovskite thin film, a preparation method thereof and a perovskite solar cell, the chemical formula of the perovskite thin film is ABX3, A is selected from at least two mixed cations of cesium, formamidine and methyl ammonium, B is lead, and X is mixed halogen of iodine and bromine; the thickness of the film is 300-600 nm, the grain size is 100-500 nm, the surface roughness Ra is smaller than or equal to 10 nm, guanidine thiocyanate is doped, the doping amount is 0.5-2.5% of the total mass of perovskite, and the molar ratio of iodine to bromine in mixed halogen changes in a gradient mode in the thickness direction of the film. By adopting the design of mixed cations and gradient halogen, the grain size of the prepared perovskite thin film is obviously increased, the surface roughness is obviously reduced, and the PL fluorescence lifetime is greatly prolonged, so that the service life of a carrier is obviously prolonged, and the effects of increasing the grain size of the perovskite thin film, reducing surface defects and enhancing thermal stability are achieved.

The invention relates to a method for regulating and deacidifying in a bioleaching process of low-grade copper sulphide ore, aiming at the problem of excessive acid caused by excessive oxidation of pyrite in a dump leaching system, a thiocyanate bactericide is added into the bioleaching system of the low-grade copper sulphide ore, and the thiocyanate bactericide is dissolved in a spray liquid of the bioleaching system, and is added into the spray liquid of the bioleaching system; under the catalytic action of mineral leaching microorganisms, oxidation of ferrous ions is enhanced, so that the oxidation-reduction potential of a solution is increased, oxidation of pyrite is intensified, acid accumulation is excessive, the thiocyanate bactericide can remarkably inhibit the activity of part of sulfur-oxidizing bacteria and even kill part of sulfur-oxidizing bacteria, and therefore the activity of ferrous oxide is reduced; compared with the prior art, the method has the advantages that the sulfur oxidation activity of microorganisms is greatly influenced, but the oxidation influence on iron is relatively small, so that the acid leaching is reduced under the condition that the copper leaching of the copper sulfide ore is not influenced, the copper leaching is not influenced, the acid leaching is reduced, the production cost is reduced, the environmental influence is reduced, and the like.

The present invention discloses a method for simultaneously reducing the biological inhibition of antibiotics and thiocyanate in erythromycin wastewater, and relates to the technical field of industrial wastewater treatment. The specific treatment method includes: by regulating the water quality characteristics of the wastewater, adding a selective reaction reagent, and regulating the reaction temperature, time, and stirring rate, the simultaneous microbial toxicity reduction of antibiotics and thiocyanate in the erythromycin wastewater is achieved. The method of the present invention has a stable reaction process, easy-to-regulate process conditions, a short time consumption, a strong selectivity in the removal process, and no need to regulate or remove other substances in the wastewater; it effectively solves the problem that erythromycin wastewater has a strong inhibitory effect on anaerobic biological processes due to the presence of high concentrations of erythromycin residual titers and thiocyanate ions, making it difficult to enter the anaerobic biological treatment process for efficient organic matter removal, and has good industrial application prospects.

The present invention provides means with which bile acids, phenols, indoles and organic acids contained in a sample can be stably preserved without cryopreservation of the sample. A sample preservation solution of the present invention is a sample preservation solution used for analyzing at least one component selected from the group consisting of bile acids, phenols, indoles and organic acids contained in a biological or environmental sample, containing at least the following (A) and (B): (A) condensed phosphate or polyoxyethylene sorbitan alkylate; and (B) guanidinium thiocyanate, Tris-HCl (pH 7 to 9), and EDTA.

The invention belongs to the technical field of preparation of organic compounds, and particularly relates to a preparation method of an isothiocyanate compound. According to the method, the myrosinase is fixed by using the metal organic framework, and column extraction is combined, so that the high-purity isothiocyanate compound can be obtained at high yield, the yield of the isothiocyanate compound is 90% or above, the purity is 97% or above, and the preparation efficiency is high. Compared with a traditional extraction method, the method has the advantages that immobilized myrosinase reaction and column extraction are coupled in real time, a solvent is saved, meanwhile, the product isothiocyanate compound is transferred into an organic phase in time, decomposition of the isothiocyanate compound and potential inhibition of the isothiocyanate compound on the activity of myrosinase are avoided, and the method is suitable for industrial production. The isothiocyanate compound is efficiently enriched, so that the purity and the yield of the isothiocyanate compound are improved.

The present application relates to a method for preparing a perovskite layer and a photovoltaic device, the method comprising: a) forming a first solid layer on a substrate from a first precursor material; the first precursor material comprising at least one divalent inorganic cation B, at least one monovalent cation A and halide anions X; b) treating the first solid layer with a second precursor solution to form the perovskite layer, wherein the second precursor solution comprises at least one monovalent cation A, halide anions X and SCN ‑ The present application enables to control the perovskite film formation process, to optimize the grain size and especially to enhance the growth of the perovskite layer on a textured morphology by adding a thiocyanate compound, in particular a mixture of methylammonium chloride (MACI) and methylammonium thiocyanate (MASCN) in the second step of a two-step process.

The invention discloses a highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and a preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, and relates to the technical field of radiation detection and scintillation materials, the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator comprises phenethyl ammonium bromide, cesium lead tribromide and ammonium thiocyanate, the molar ratio of the phenethyl ammonium bromide to the cesium lead tribromide to the ammonium thiocyanate is 2: 4: 2, the scintillator contains a methylamine thiocyanate additive which accounts for 0-1 equivalent weight of the dosage of the ammonium thiocyanate, and the scintillator is of a flaky polycrystal structure; the perovskite crystal of the polycrystalline wafer has a quasi-two-dimensional layered crystal structure, and each crystal grain is arranged in a height orientation manner, so that the layered crystal face is parallel to the main plane of the scintillator sheet. According to the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator for X-ray detection imaging and the preparation method of the highly-oriented quasi-two-dimensional perovskite multi-wafer scintillator, a highly-oriented layered structure is formed in the crystal, diffuse scattering of emergent light is greatly reduced, brightness uniformity and spatial resolution of X-ray imaging are improved, and a finer imaging effect is achieved.

The invention relates to a spleen-tonifying, appetite-stimulating and digestion-promoting traditional Chinese medicine preparation UPLC detection method and a fingerprint spectrum, and belongs to the technical field of medicine detection. The invention aims to solve the technical problems that the existing quality control method of the spleen-tonifying, appetite-promoting and digestion-promoting pills lacks comprehensive and objective analysis on the spleen-tonifying, appetite-promoting and digestion-promoting pills, and the problems of low precision, poor reproducibility, low efficiency and the like during detection of related components in the prior art are solved. According to the technical scheme, the UPLC detection method is characterized in that a mixed standard substance of gallic acid, 5-hydroxymethylfurfural, chlorogenic acid, sinapine thiocyanate, sinapic acid, hyperoside, 3, 6-dimustard acyl sucrose, hesperidin, naringenin, nobiletin and hesperetin is taken as a contrast, an acetonitrile-0. 1% formic acid aqueous solution is taken as a mobile phase, gradient elution is carried out, and the content of chlorogenic acid in the sample is detected. The qualitative and quantitative detection of the effective components of the spleen-tonifying, appetite-promoting and digestion-promoting pill is realized.

The application discloses a preparation method of a nitrogen-containing heterocyclic compound and an alkali metal salt of the nitrogen-containing heterocyclic compound, and steps of the preparation method of the nitrogen-containing heterocyclic compound comprise: (1) uniformly mixing trithiocyanic acid with a first solvent, introducing sulfuryl fluoride gas or adding an alkenyl sulfonyl fluoride to perform a reaction, and obtaining a crude product through a crude treatment after the reaction is finished; (2) purifying the crude product to obtain the nitrogen-containing heterocyclic compound shown in a structural formula 1; wherein R1, R2 and R3 are each independently selected from -H, -SO2F or -CH2-(CH2) n -SO2F, n is an integer selected from 1-10, and R1, R2 and R3 are not H at the same time. The preparation method of the nitrogen-containing heterocyclic compound and the alkali metal salt of the nitrogen-containing heterocyclic compound can be applied to a large amount of trithiocyanic acid in a lithium battery electrolyte, raw materials are easy to obtain, operation is simple, the yield is high, the condition is mild, the requirement for equipment is low, and the method is suitable for industrial production.

The application discloses a preparation method of a photocatalyst for CO2 reduction and application thereof. The photocatalyst is prepared through the following steps: first, preparation of the photocatalyst bismuth oxysulfate; second, metal loading modification of the photocatalyst bismuth oxysulfate. Thiocyanic acid and bismuth nitrate are used as raw materials to synthesize the photocatalyst bismuth oxysulfate, and copper chloride or silver nitrate reagent is selected as a material for metal loading modification of the bismuth oxysulfate, and the selected materials are inexpensive and easy to purchase, and the economic cost is low. The photocatalyst prepared by the method has the advantages of high selectivity, can accelerate electron movement under light conditions, promotes CO2 reduction degradation, and has high stability, and is an ideal photocatalyst. Compared with existing photocatalyst materials, the material has high catalytic degradation reducibility and selectivity, high stability, and when used as a CO2 photocatalyst, can efficiently reduce and convert CO2 into multi-carbon products.

The application discloses a kind of iron monatomic catalysts with controllable sulfur content and coordination mode and its preparation method and application, nitrogen-allyl thiourea and thiocyanic acid are respectively used as sulfur-containing organic ligand and sulfur-containing supramolecular precursor, chelate with iron ion, and use the hydrogen bond interaction between melamine and cyanuric acid, complete supramolecular self-assembly process;And high-temperature pyrolysis is carried out under argon atmosphere, and iron monatomic catalysts with controllable sulfur content and coordination mode can be prepared.The application also includes the application of iron monatomic catalysts with controllable sulfur content and coordination mode in removing organic pollutants such as p-chlorophenol and antibiotics in water.Iron monatomic catalysts with controllable sulfur content and coordination mode can improve the activation efficiency of persulfate, the content and selectivity of active oxygen species generated, and achieve efficient degradation of p-chlorophenol under different anion-cation, humic acid and pH conditions, while having good recycling performance.

The application provides an intermediate of a tunicamycin derivative and a synthesis method of the intermediate. The method provided by the application directly protects an amino group of prodigiosin B with phenyl isothiocyanate, then protects a hydroxyl group (a thiourea group is simultaneously subjected to an alkylation reaction), and obtains an intermediate compound with a brand-new structure, then performs a photocatalytic ring-closing reaction, then protects a 5-hydroxyl group, and finally obtains a target compound through a simple Edman degradation reaction. Compared with the prior art, the method has a short reaction route and a significantly improved yield.

The invention discloses a self-repairing mute tire and a preparation method thereof, and relates to the technical field of tires, the self-repairing mute tire comprises a tire body, and a self-repairing rubber layer and a mute material which are sequentially attached to the inner wall of the tire body from inside to outside; the self-repairing adhesive layer is prepared from the following components: epichlorohydrin rubber, acrylate rubber, a rosinyl phenyl phosphine oxide isoxazolyl functional polymer, 4, 4-chloroformyl phenyl ether, a catalyst, 2, 2-bis [4-(4-aminophenoxy) phenyl]-1, 1, 1, 3, 3, 3-hexafluoropropane, trithiocyanuric acid, a filler, an accelerant TMTD (Tetramethylthiuram Disulfide) and an auxiliary agent; the rosinyl phenyl phosphine oxide isoxazolyl functional polymer comprises structural units introduced through a condensation polymerization reaction of the following monomers: glycerol triabietate, bis (4-carboxyl phenyl) phenyl phosphine oxide and 3, 5-isoxazoledicarboxylic acid. The tire is remarkable in self-repairing effect, good in mute performance, sufficient in performance stability and long in service life.

The invention relates to a color developing solution for detecting iron metal foreign matters in a lithium battery production process and a detection method, and the color developing solution comprises the following components in parts by volume: 3-4 parts of an acid solution, 1-2 parts of an oxidizing agent and 3-4 parts of a thiocyanate solution. The color developing solution is provided for detection of the iron metal foreign matter in the lithium battery production process, the iron metal foreign matter in the lithium battery production process is rapidly and qualitatively detected by utilizing a color developing reaction of ferric ions and thiocyanate ions to generate a blood red complex iron thiocyanate, and the detection sensitivity, the detection efficiency and the speed are high; the reagent of the color developing solution is nontoxic and harmless, the cost is low, the color developing solution is particularly suitable for large-batch detection on a mass production line, the detection efficiency of the production line is greatly improved, and meanwhile, high detection sensitivity is taken into account.

The present application relates to the technical field of detection, and particularly relates to a fluorescent film, a preparation method and application thereof. The fluorescent film is prepared from a mixed precursor solution containing carbon quantum dots and a polyimide precursor, and the carbon quantum dots are prepared by using fluorescein isothiocyanate as a carbon source. The enhanced fluorescent film provided by the present application has a significantly enhanced fluorescence intensity when exposed to ammonia, and the fluorescence intensity has a good linear response to the ammonia concentration within 0-8 ppm, so that the freshness of fish meat and the like can be well detected, and the enhanced fluorescent film has the advantages of fast response, strong anti-interference, high precision and the like, and can solve the technical problem that the freshness of fish meat is difficult to be quickly and non-destructively detected during storage and transportation, and provide a more effective technical means for quality monitoring and tracking of fish meat.

The invention relates to the technical field of drilling, in particular to a preparation method of composite lubricating particles for drilling fluid and the drilling fluid, the drilling fluid is formed by compounding a multi-defect-state g-C3N4-MoS2 heterostructure and nano bentonite, g-C3N4 is prepared through a urea-ammonium thiocyanate eutectic supramolecular self-assembly and gradient calcination technology, and the composite lubricating particles are prepared through a composite lubricating agent. Introducing an N vacancy by adopting plasma treatment; moS2 is subjected to oriented epitaxial growth on the surface of g-C3N4-MoS2 through a microwave-assisted hydrothermal method; the nano bentonite is obtained by high-pressure homogenization and supercritical CO2 stripping. After the drilling fluid is subjected to multi-stage dispersion, experiments find that the friction coefficient is as low as 0.43 and is reduced by 52% compared with that of conventional drilling fluid, the abrasion loss is reduced by 97% or above, the friction resistance in the drilling process can be remarkably reduced, the service life of a drill bit can be prolonged, and the drilling fluid is particularly suitable for ultra-deep well drilling operation of shale gas, deep sea oil gas and the like.

The application provides a preparation method of a biomimetic flagelliform nanowire and relates to the technical field of nanowire material preparation. The method comprises the following steps: mixing and immersing a trithiocyanic acid solution and copper hydroxide nanowires, and obtaining immersed nanowires after drying; the immersion conditions comprise the following steps: the temperature is 20-45 DEG C, and the time is 0.01-50 min; and the obtained immersed nanowires are calcined at 250-500 DEG C for 2-6 h. The method provided by the application uses a trithiocyanic acid solution to immerse Cu(OH)2 nanowires, and then calcines in a muffle furnace. The method provided by the application is simple in operation, the prepared nanowires are uniform and controllable in morphology, and can be applied to the fields of oil-water separation, battery negative electrode current collectors, adsorption and the like.

The invention discloses an amorphous copper-trithiocyanuric acid coordination polymer as well as a preparation method and application thereof, and belongs to the technical field of functional materials and biomimetic catalysis. The polymer does not have a long-range ordered structure, and the copper element takes cuprous as a main existence valence state. The preparation method comprises the following steps: carrying out surface coordination reaction on cuprous oxide serving as a template and trithiocyanuric acid to form a core-shell intermediate, removing the template through acid etching, and reconstructing to obtain the final amorphous coordination polymer. The material simultaneously has high-efficiency peroxidase-like and glutathione-like oxidase double-enzyme activity, can synergistically catalyze hydrogen peroxide to generate hydroxyl radicals and consume glutathione, and can remarkably kill cancer cells by inducing a copper death mechanism in a tumor microenvironment. The material is unique in structure and excellent in catalytic performance, the preparation method is simple, convenient and controllable, and the material has wide application prospects in the fields of tumor catalytic treatment, bionic sensing and the like.