228 results about "Thiocyanic acid" patented technology

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 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 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 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.

The invention relates to the technical field of chemical preparation, in particular to a preparation method of gamma-thiocyano propyl triethoxy silane, which comprises the following steps: adding acetonitrile and tetrabutyl ammonium thiocyanate into a reaction container, dropwise adding 3-chloropropyl triethoxy silane into a four-mouth round-bottom flask while stirring, and controlling the dropwise adding time; the preparation method comprises the following steps: heating to 30-40 DEG C, reacting for 1.5-3 hours, cooling to room temperature, adding an ice-saturated sodium chloride solution into a reaction container to obtain a mixed solution, extracting the mixed solution, taking an organic layer, sequentially washing, drying and filtering, and respectively carrying out vacuum concentration and vacuum rectification on filtrate to obtain the gamma-thiocyano propyl triethoxy silane. The preparation method of the gamma-thiocyano propyl triethoxy silane provided by the invention is carried out under an anhydrous condition, so that hydrolysis and condensation side reactions of silane caused by a water-phase synthesis method are effectively avoided, meanwhile, the generation of irritant gases such as hydrogen sulfide and the like is avoided, and the preparation method is safer to operate, environment-friendly and more suitable for industrial popularization.

The invention discloses a preparation method of a spherical carbon nano polymer steel slag cement grinding aid, which comprises the following steps: (1) mixing and dissolving a polycarboxybenzene compound, an amino alcohol compound and a condensing agent in an organic solvent to prepare a solution A, stirring and activating at a first temperature, then keeping stirring and heating to a reaction temperature, and reacting at a certain pressure to obtain a reaction solution B; after the reaction is finished, centrifuging and taking supernate, and filtering to obtain a polymer solution; (2) mixing the obtained polymer solution with hydrochloric acid to prepare a solution B, placing the solution B in an ice salt bath, dropwise adding a nitrite solution, and stirring for a first reaction; and adding thiocyanate and a cuprous salt catalyst, removing the ice salt bath, heating, carrying out a second reaction, and cooling to room temperature after the reaction is finished to obtain the spherical carbon nano polymer steel slag cement grinding aid. The grinding aid can improve the grinding efficiency of the steel slag cement, the performance of the steel slag cement is improved, and the process is simple and efficient.

The invention relates to the technical field of nucleic acid detection, in particular to a lysis buffer solution, a kit and an extraction method for extracting free DNA of peripheral blood. The lysis buffer solution for extracting the free DNA of the peripheral blood comprises a first lysis solution and a second lysis solution, the first lysis solution takes guanidine hydrochloride as a main chaotropic agent and at least one of ammonium thiocyanate and guanidine isothiocyanate as an auxiliary chaotropic agent, and is compounded with a metal ion chelating agent, trehalose, dithiothreitol, digestive enzyme, sodium dodecyl sarcosinate, borate and ascorbic acid; the second lysis solution takes guanidine hydrochloride as a main chaotropic agent and urea as an auxiliary chaotropic agent, and is compounded with a metal ion chelating agent, trehalose, dithiothreitol, digestive enzyme, sodium dodecyl sarcosinate, borate, ascorbic acid and polyethylene glycol. The buffer solution of the lysate does not contain SDS (sodium dodecyl sulfate), so that the residue of SDS in an extracted product can be avoided, and the amount of extracted free DNA (deoxyribonucleic acid) is more.

The invention relates to the technical field of virus extraction kits, in particular to a large-volume sample virus nucleic acid rapid extraction kit and method.The large-volume sample virus nucleic acid rapid extraction kit comprises a protease K solution, magnetic beads, a lysis solution, a rinsing solution 1, a rinsing solution 2 and an eluent; the magnetic beads are hydroxyl magnetic beads; the lysate is prepared from guanidine isothiocyanate, Tris alkali, Tris hydrochloric acid, triton X-100, isopropyl alcohol and polyoxyethylene ether; the rinsing liquid 1 is composed of a guanidine hydrochloride solution and isopropanol; the rinsing liquid 2 is composed of absolute ethyl alcohol and purified water; the kit provided by the invention can easily obtain viral nucleic acid from a large-volume sample, is simple to operate, can extract a plurality of samples at one time, realizes rapid diagnosis, and makes up the vacancy of a kit for automatically extracting viral nucleic acid from a large-volume sample at high flux in the current market.

The invention discloses a method for separating rhenium from a rhenium-rich solution containing molybdenum and tungsten. The method comprises the following steps: extracting a rhenium-rich raw material solution containing ReO4 <-> and impurity ions by using an extraction agent containing hydrophobic ionic liquid to obtain an organic extraction phase containing ReO4 <-> and a raffinate phase containing the impurity ions; wherein the solvent of the raw material solution is water, and the impurity ions comprise one or two of MoO4 < 2-> and WO4 < 2->; the hydrophobic ionic liquid is composed of positive ions and negative ions, the anions are selected from one or more of halide ions, borate anions, carboxylate anions, carbonate anions, nitrate ions, nitrite ions, sulfate anions, sulfite anions, sulfonate anions, phosphate anions, phosphite anions, thiocyanate anions and amino acid ions. The method is high in separation efficiency, simple in technological process, easy to amplify, small in extraction agent loss, capable of being recycled and suitable for industrial production.

The invention relates to the technical field of organic chemistry, in particular to a method for efficiently constructing a thiocyano substituted aromatic organic intermediate, which is characterized in that a reaction system consisting of CFBSA and KSCN is utilized, acetonitrile is used as a solvent, aromatic amine, indole and aromatic ring compounds are used as reaction substrates to generate thiocyanation reaction at room temperature, and the thiocyano group is efficiently introduced. The method has the advantages of low price, environmental friendliness, convenience in use, simplicity and convenience in operation, insensitivity to water and oxygen, no need of metal catalysis, wide substrate application range and application to thiocyanation reaction of aromatic amine compounds, indoles and phenols through thiocyanate sources such as KSCN, NH4SCN and the like.

The application discloses a preparation method of a lead-tin mixed perovskite single crystal thin film and near-infrared detection application thereof, and relates to the technical field of photoelectric materials and devices. The method introduces an anti-solvent into a saturated precursor liquid to prepare a high-quality seed layer, and dynamically supplements a growth liquid in a key stage of space-limited growth, effectively solves a crystal boundary pore problem caused by solute depletion, and successfully prepares a dense, pore-free and continuous lead-tin mixed perovskite single crystal thin film. Further combined with precursor liquid concentration optimization, an ammonium thiocyanate additive and Me-4PACz interface modification, the defect state density of the thin film is significantly reduced.

A novel bis-ligand chalcopyrite collector and a preparation method and application thereof. The collector is prepared by first synthesizing an intermediate oxalyl diisothiocyanate from oxalyl chloride and thiocyanate, and then reacting the intermediate with an amine or an alcohol using a one-pot method. The collector provided by the present disclosure can form more stable dual-site adsorption on the chalcopyrite surface, thereby generating a more stable double-chelate-ring structure than the single-site adsorption of a traditional chalcopyrite collector such as xanthate and dithiophosphate. The collector not only has higher collection ability and excellent selectivity, but also can achieve efficient copper-sulfur separation even under a low-alkalinity condition. The preparation process of the collector is simple and operable, facilitating the flotation of chalcopyrite and its separation from pyrite.

The application provides a method for preparing calcium thiocyanate by using desulfurization waste liquid, calcium nitrate and ammonium thiocyanate are respectively dissolved into 30-50% solution, the calcium nitrate solution is slowly dropped into the hot ammonium thiocyanate solution under the conditions of heating and stirring, under the heating state, the double decomposition reaction occurs to generate calcium thiocyanate and ammonium nitrate, with the continuous heating and the evaporation of water, the concentration of calcium thiocyanate gradually increases, the ammonium nitrate is heated and decomposed to generate nitrogen oxide and ammonia gas, the generated process gas rich in nitrogen oxide and ammonia gas is condensed and introduced into the coking ammonia removal and denitration section for treatment, and finally the evaporation and concentration obtain about 50% calcium thiocyanate product. The method uses industrial waste to provide raw materials, and the production cost is low; the process tail gas generated in the reaction only needs to be treated by the existing ammonia removal and denitration device of the coking enterprise, without increasing additional equipment, thereby saving the expenditure; and the method has environmental protection benefit, social benefit and economic benefit.

This invention discloses a dimerized triarylmethane compound for blue photoresist color paste and its synthesis method. The compound is a dimerized blue triarylmethane compound A, which is prepared by the following steps: (1) reacting reactant B with diacid chloride as an acylation reagent to obtain intermediate C; (2) removing the Boc group from intermediate C to obtain intermediate D; (3) cyclizing intermediate D with potassium thiocyanate and acyl chloride reagent to obtain intermediate E; (4) reacting intermediate E with 4,4-bis(diethylamino)benzophenone to obtain F; (5) salting intermediate F to obtain the target dimerized triarylmethane compound A. The dimerized triarylmethane compound of this invention has excellent color performance and is suitable for blue photoresist color paste. It can significantly improve the brightness, transparency, contrast and dispersibility of the color paste, while also possessing high hiding power, strong tinting strength and good thermal and light stability.

The present invention is characterized by being a novel sulforaphane derivative comprising a complex of sulforaphane (1-isothiocyanato-4-[methylsulfinyl]butane (SFN)) and cysteine persulfide (CysSnH, n=2, 3, 4, or 5) or glutathione persulfide (GSnH or GSnG, n=2, 3, 4, or 5).

According to the 3, 6-dihydro-1, 2-oxazine compound and the synthesis method thereof, 1, 4, 2-dioxazole-5-ketone and 1, 3-conjugated diene are used as raw materials, commercially available cuprous thiocyanate is used as a catalyst, no additional oxidizing agent needs to be added in the reaction process, and 1, 4, 2-dioxazole-5-ketone, 1, 3-conjugated diene and 1, 4, 2-dioxazole-5-ketone are used as raw materials. 2, 2-dioxazole-5-ketone and a copper catalyst form a metal nitrogen-based intermediate which can be used as a self-oxidant to promote the reaction, so that the problems of poor substrate adaptability, low reaction activity, more byproducts and the like of a traditional cyclization method are solved; compared with harmful by-products (such as sulfur / nitrogen-containing compounds or heavy metal residues) generated by a traditional process, the environment friendliness of the method is remarkably improved, and meanwhile, the waste treatment cost is reduced, so that the comprehensive benefits of industrial production are effectively improved.

This invention belongs to the field of water treatment technology, specifically relating to a trithiocyanate-coupled graphene oxide composite material, its preparation method, and its application. To more efficiently and selectively separate and enrich copper ions in wastewater, this invention provides a trithiocyanate-coupled graphene oxide composite material, obtained by covalently coupling trithiocyanate and graphene oxide through a nucleophilic substitution reaction. This composite material exhibits excellent adsorption and removal efficiency for copper ions in complex aqueous systems with both single and multiple components, while showing minimal adsorption of other metal ions such as gallium, silver, indium, cobalt, and neodymium. Furthermore, after multiple adsorption-desorption cycle tests, the composite material maintains a high metal ion removal rate, demonstrating excellent structural stability and regeneration performance. Therefore, this composite material holds promise for the selective separation and enrichment of copper ions in complex aquatic environments, possessing excellent prospects for industrial application.

The application belongs to the technical field of photocatalytic materials, and relates to a high-selectivity K + A preparation method of intercalated porous layered g-C3N4: thiocyanic acid, ammonium chloride and potassium chloride are fully ground to obtain a white solid mixture, wherein the mass ratio of the thiocyanic acid, the ammonium chloride and the potassium chloride is 1:2-6:0.015-0.09; the white solid mixture is calcined at a temperature rising rate of 1-3 DEG C / min to 500-550 DEG C for 3-5 h, and after being cooled to room temperature, the obtained yellow solid is washed and dried, and the intercalated porous layered g-C3N4 is obtained. The application also discloses application of the material in photocatalytic production of H2O2. The prepared intercalated porous layered g-C3N4 has the advantages of narrow band gap and enhanced reduction capacity. + The intercalated porous layered g-C3N4 has narrow band gap and enhanced reduction capacity, K + The introduction of the K can effectively inhibit the recombination of photo-generated carriers, the porous structure can significantly improve the 2e ‑ ORR selectivity, thereby greatly improving the photocatalytic production of H2O2 performance of the K + Intercalated porous layered g-C3N4.

This invention relates to the field of grain storage technology, and in particular to a natural plant essential oil insecticide composition, its preparation method, and its application. The natural plant essential oil insecticide composition comprises a main active ingredient and co-active ingredients. The main active ingredient includes cinnamaldehyde, allyl isothiocyanate, and cuminaldehyde. The co-active ingredients include 1,8-cineole, β-phellandrene, γ-terpinene, p-cymene, eugenol, α-pinene, linalool, and limonene. By volume percentage, the insecticide composition contains: cinnamaldehyde 15-40%, allyl isothiocyanate 20-40%, and cuminaldehyde 0.5-16.5%. The insecticide composition provided by this invention is made from natural plant essential oils, is stable, safe, environmentally friendly, does not pollute grains, and has an aromatic odor. It has a strong insecticidal effect on pests such as rice weevils in grains and has good application prospects in the field of grain storage.

The invention discloses a method for recovering precious metals from an extracted organic phase. According to the method for recycling the precious metal from the extracted organic phase, thiourea-thiocyanate (TU-SCN-) is adopted to cooperate with a complexing back-extraction agent A to conduct multi-stage back-extraction on the extracted organic phase O, and metal recycling in the extracted organic phase is achieved. According to the method for recovering the precious metal from the extracted organic phase, a thiourea-thiocyanate (TU-SCN-) synergistic complexing back extraction system is adopted for recovering the metal from the extracted organic phase, the back extraction efficiency is high, and the metal recovery rate is high (gt; and precious metals such as gold and silver can be recovered from an organic phase at a relatively low cost.