70 results about "Iodide potassium" patented technology

The invention discloses a crown ether functionalized covalent organic framework material as well as a preparation method and application thereof, and the method comprises the following steps: adding a covalent organic framework material, 4-bromobenzo-15-crown-5, potassium carbonate and potassium iodide into an acetone solution for reaction, washing the obtained crude product, performing Soxhlet extraction with tetrahydrofuran for a certain time, and drying to obtain the crown ether functionalized covalent organic framework material. The crown ether functionalized covalent organic framework material is obtained. Compared with a synthesis method of crown ether functionalized COFs in the prior art, the method has the advantages that the crown ether (4-bromobenzo-15-crown-5) can be grafted to the COFs in one step, the Na < + > adsorption capacity and the adsorbent recycling performance are greatly improved, the synthesis method is simple, and synthesis of the crown ether functionalized COFs is greener, more convenient and more economical.

The invention relates to a synthesis method of low-cost environment-friendly dioscorea element I. The synthesis method comprises the following steps: by taking 3, 5-dimethoxybenzyl alcohol as a raw material, brominating, reacting with triethyl phosphite and 4-benzyloxy-3-methoxybenzaldehyde to generate 3, 4 ', 5-trimethoxy-3'-benzyloxy stilbene, carrying out ultraviolet cyclization reaction, reacting with palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon, palladium-carbon and debenzylating with hydrogen to obtain the Chinese yam element I. The potassium iodide is used as the catalyst in the ultraviolet lamp irradiation catalytic ring closing reaction, the pure water is used as the detergent, compared with the method adopting iodine as the catalyst and adopting a sodium thiosulfate aqueous solution as the detergent, the product yield of the compound 33-4 is 75%, the yield of the compound 33-5 is 16.6%, the purity is 98.7%, and the method has the advantages of low cost, high yield, few impurities and the like.

Aspects of the present disclosure are directed towards a method for producing an activated carbon / bismuth oxy-iodide nanocomposite. The method includes heating a glycol solution including Bi(NO3)3·5H2O and activated carbon to 100° C. The method includes heating a glycol solution includes potassium iodide to 100° C. The method includes adding the glycol solution including Bi(NO3)3·5H2O and activated carbon and the glycol solution including potassium iodide to a reaction vessel including a solvent to form a reaction mixture. The method includes chilling the reaction mixture to ambient temperature. The method includes filtering the reaction mixture to obtain the activated carbon / bismuth oxy-iodide nanocomposite.

Aspects of the present disclosure are directed towards a method for producing an activated carbon / bismuth oxy-iodide nanocomposite. The method includes heating a glycol solution including Bi(NO3)3·5H2O and activated carbon to 100° C. The method includes heating a glycol solution includes potassium iodide to 100° C. The method includes adding the glycol solution including Bi(NO3)3·5H2O and activated carbon and the glycol solution including potassium iodide to a reaction vessel including a solvent to form a reaction mixture. The method includes chilling the reaction mixture to ambient temperature. The method includes filtering the reaction mixture to obtain the activated carbon / bismuth oxy-iodide nanocomposite.

The invention discloses a preparation method of a difluoromethyl reagent and application of the difluoromethyl reagent in synthesis of a nickel-catalyzed alkyl difluoromethyl compound. The preparation method of the difluoromethyl reagent comprises the following steps: in an inert gas atmosphere, adding potassium iodide, cuprous iodide and a water-containing dimethylformamide solution into a reaction container, heating, dropwise adding difluorochloroacetic acid of DMF (Dimethyl Formamide) into a reaction system, collecting difluoroiodomethane, and supplementing a 1-methyl-2-pyrrolidone NMP (N-Methyl Pyrrolidone) solution into the system. The invention provides a difluoromethyl reagent which is simple and convenient to operate, low in cost, high in yield, environment-friendly and beneficial to large-scale preparation and application of the reagent in synthesis of difluoromethyl substituted alkane compounds.

The invention discloses a fully continuous flow preparation method of 4, 5-diiodine-1H-imidazole, and belongs to the technical field of synthesis and preparation. The method comprises the following steps: S1, simultaneously conveying an imidazole-containing sodium hydroxide aqueous solution, an iodine-containing elementary substance and a potassium iodide aqueous solution into a micro-mixer and a continuous flow coil reactor, and carrying out a continuous synthesis reaction to obtain a 4, 5-diiodine-1H-imidazole reaction solution; and S2, dropwise adding an acetic acid solution into the 4, 5-diiodine-1H-imidazole reaction solution to neutralize, separating out a solid product, washing with ice water, filtering and drying to obtain a 4, 5-diiodine-1H-imidazole solid. The fully continuous flow reaction technology system provided by the invention has excellent mass transfer and heat transfer performance, greatly enhances mixing among material molecules, greatly shortens the reaction time, and improves the reaction efficiency. The reaction time is shortened to more than ten seconds from more than ten hours of the traditional intermittent kettle reaction; meanwhile, the side reaction is inhibited, and the product quality of the 4, 5-diiodine-1H-imidazole (I) is improved.

The invention discloses luminous ink for preparing a scintillation layer and a preparation method and application of the luminous ink. The preparation method comprises the steps that cuprous iodide is dissolved in a saturated potassium iodide aqueous solution, hypophosphorous acid is added, and a first mixed solution is obtained; adding the first mixed solution into a polyvinylpyrrolidone solution to obtain a second mixed solution; the preparation method comprises the following steps: dissolving phenyl trimethyl ammonium iodide in a mixed solution of ethanol and acetonitrile to obtain a phenyl trimethyl ammonium iodide solution; quickly mixing a phenyltrimethylammonium iodide solution with the second mixed solution, stirring for a period of time, centrifuging and washing to obtain nano-particles, and dispersing the nano-particles into a solvent; metal copper-based halide nanoparticles are prepared at room temperature by using a single-component solution method, and then the metal copper-based halide nanoparticles are dispersed into a solvent to obtain the luminous ink. And then the luminous ink is uniformly sprayed on a selected substrate, and the thickness and the area can be freely adjusted according to requirements, so that a high-resolution scintillation layer is prepared.

The present application relates to the technical field of corrosion inhibitor, and proposes a thiourea modified imidazoline corrosion inhibitor and a preparation method thereof, which comprises the following components by weight: 40-50 parts of thiourea modified imidazoline, 6-8 parts of isopropyl alcohol, 0.1-0.2 parts of potassium iodide, 10-15 parts of an additive, and 35-40 parts of a solvent; the additive is composed of 2-amino-5-iodobenzoic acid methyl ester and a surfactant. Through the above technical solution, the problem of low corrosion inhibition rate and fast corrosion speed of the thiourea modified imidazoline corrosion inhibitor in the prior art is solved.

This invention provides a highly sensitive and rapid nitrite detection kit and method. The kit includes a detection solution, a standard colorimetric card, and test tubes. The molar ratio of sulfuric acid, potassium iodide, and starch indicator is 3:4:39. This invention solves the problems of existing nitrite detection technologies, such as reliance on specialized instruments and laboratory environments, cumbersome and time-consuming operation, inability to meet the needs of on-site, real-time testing, poor matrix compatibility of detection kits, lack of graded warnings based on national food safety standards and toxicological risks, insufficient reagent stability, and difficulty in balancing detection sensitivity and accuracy. It features convenient operation, suitability for on-site, real-time testing; excellent detection performance, accurate and reliable results; stable physicochemical properties of the detection solution, good storage properties; intuitive risk classification, and strong practicality.

The invention relates to an ultra-thin iodine polaroid, a preparation method and an ultra-thin circular polaroid, and the ultra-thin iodine polaroid comprises polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol and iodine and / or potassium iodide dispersed in the polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol in a dissolving manner. According to the invention, iodine and / or potassium iodide are / is dissolved and dispersed in polyethylene glycol terephthalate-1, 4-cyclohexanedimethanol, and the ultrathin iodine polarizer is finally obtained through the steps of material mixing, distillation, extrusion, coating, curtain coating, one-way calendering, stretching and drying. On the first aspect, iodine and / or potassium iodide are dispersed more uniformly by adopting a dissolving and dispersing mode, so that the degree of polarization and the light transmittance of each part of the polaroid are guaranteed; on the second aspect, the polaroid does not need to be clamped and fixed by a cellulose triacetate film, so that the thickness of the polaroid can be further reduced; and thirdly, a retarder is compounded on the ultra-thin iodine polaroid, so that the purpose of manufacturing the ultra-thin circular polaroid is achieved.

The utility model relates to the technical field of etching equipment, and discloses an etching structure which comprises a tank body, a first motor is fixedly assembled at the bottom of the tank body, a sliding groove is formed in the outer wall of the tank body, a lead screw is fixedly assembled on an output shaft of the first motor, a lifting block is connected to the outer wall of the lead screw in a threaded mode, and the lifting block is fixedly connected with the bottom of the tank body. A fixing rod is fixedly assembled at the top of the lifting block, and a top cover is fixedly assembled at the tail end of the fixing rod. According to the etching structure, through the arrangement of the tank body, the first motor, the sliding groove, the lead screw, the lifting block, the fixing rod, the top cover and the storage tank, in the operation process of the equipment, a user can lift a filter screen through operation of the first motor, so that the user can conveniently place a sample; and silicon dioxide and potassium iodide are utilized to soak the sample in the operation process, so that the condition of excessive etching is avoided, the etching precision of a user on the sample is further guaranteed, and the practicability of the equipment is also improved.

The application discloses a method for detecting the acidity of a circulating solution of electro-deposited cobalt, which comprises the following steps: removing oxidizing substances in the circulating solution of electro-deposited cobalt by potassium iodide in an acidic medium; reacting the potassium iodide with potassium iodate and acid to generate iodine molecules; titrating with a sodium thiosulfate standard solution until the solution changes from blue or blue-black to the original color of the solution, which is the end point; and calculating the acidity content according to the mass balance. The method can effectively remove the oxidizing substances in the solution to be measured, avoid the interference with the determination of the acidity content, and make the detection result more accurate. The sodium thiosulfate is innovatively applied to the detection of the acidity of the circulating solution of electro-deposited cobalt, and the sodium thiosulfate titration is used to replace the commonly used sodium hydroxide titration method, so that the interference of the original color of the light red solution with the color judgment of the end point of the sodium hydroxide (phenolphthalein as an indicator) is avoided.

The invention discloses a method for rapidly detecting carbon disulfide in a paraffin remover and inhibitor. The method comprises the following steps: 1, preparing a potassium hydroxide ethanol solution; 2, putting the paraffin remover or paraffin inhibitor to be detected into the potassium hydroxide ethanol solution, and uniformly stirring to obtain a detection intermediate solution; 3, acidifying hydrogen peroxide with colorless dilute acid to obtain an acidic hydrogen peroxide solution; 4, placing the dried starch potassium iodide test paper in an acidic hydrogen peroxide solution, waiting for 30 seconds when the starch potassium iodide test paper turns blue and the color does not change any more, and taking out the blue starch potassium iodide test paper; and 5, putting blue starch potassium iodide test paper into the detection intermediate solution in the step 2, and judging whether the to-be-detected paraffin remover or paraffin inhibitor contains CS2 or not according to whether the blue starch potassium iodide test paper fades or not. According to the detection method disclosed by the invention, whether the paraffin remover or the paraffin inhibitor contains CS2 or not is qualitatively judged through color difference of color development reaction, and the method has the advantages of simplicity, high detection efficiency, wide application range and the like.

The application discloses a synthesis method and application of a crystalline BI4O5I2 / amorphous Fe2O3 heterojunction, and belongs to the technical field of catalysts. The synthesis method comprises the following steps: step one, dissolving ferric nitrate and trisodium citrate in deionized water, stirring until completely dissolved, transferring the obtained solution into a reaction kettle to perform a hydrothermal reaction, washing and drying the product after the reaction is completed, and obtaining amorphous Fe2O3; step two, dissolving bismuth nitrate in ethylene glycol, stirring, adding the amorphous Fe2O3 prepared in step one and mixing uniformly, dropwise adding a potassium iodide solution into the mixture, transferring the obtained mixture into a reaction kettle to perform a hydrothermal reaction, washing and drying the product after the reaction is completed, and obtaining the crystalline Bi4O5I2 / amorphous Fe2O3. By adjusting the amount of trisodium citrate and key parameters such as bismuth nitrate in the hydrothermal synthesis process, the heterojunction material is successfully constructed, and the material can be used for photocatalytic removal of Cr(VI) at a concentration of 100mg·L ‑1 Cr(VI).

The utility model belongs to the technical field of waste gas absorption, and particularly relates to a liquid chlorine storage tank waste gas absorption device which comprises an outer cavity, a cylinder is mounted at the edge of the top side of the outer cavity, a pore plate is mounted on the inner wall of the cylinder, wet starch-potassium iodide test paper is mounted on the top side of the pore plate, and a camera is mounted on the top side of the cylinder in a penetrating manner. A connecting cavity is formed in the outer side of the middle end of the air conveying pipe, a negative pressure motor is installed in the connecting cavity, and three fan blades are installed at the output end of the negative pressure motor. When the liquid chlorine storage tank body leaks chlorine, the leaked chlorine diffuses into the outer cavity and penetrates through the pore plate to be in contact with the wet starch-potassium iodide test paper, the test paper turns blue due to the oxidability of the chlorine, so that chlorine leakage is indicated, the camera monitors the state of the test paper in real time, and once it is found that the test paper turns blue, the test paper stops working. The camera transmits a signal to the control panel, and the control panel starts the negative pressure motor, so that the chlorine leakage condition is found in time, and the negative pressure motor is automatically started to perform gas suction treatment.

The application relates to the technical field of water quality analysis and chemical detection, and provides a total chlorine detection reagent and a preparation method thereof. The total chlorine detection reagent is composed of three kinds of reagents: a first reagent potassium iodide solution, a second reagent DPD chromogenic agent solution and a third reagent composite buffer stabilizer solution. The first reagent potassium iodide solution comprises the following raw materials: 0.15%-0.25% of potassium iodide and the balance of water, with 100wt% as a basis. The second reagent DPD chromogenic agent solution comprises the following raw materials: 0.10%-0.20% of N,N-diethyl-p-phenylenediamine, 0.40%-0.60% of sulfuric acid and the balance of water, with 100wt% as a basis. The third reagent composite buffer stabilizer solution comprises the following raw materials: 6.30%-7.70% of a phosphate buffer, 0.40%-0.70% of a composite stabilizer and the balance of water, with 100wt% as a basis. The total chlorine detection reagent has the characteristics of simple manual operation, reagent saving, strong anti-interference ability and good stability.

The utility model discloses a potassium iodide producing and generating device which comprises a supporting frame and a plurality of reaction kettles, a rotating ring is arranged on the supporting frame in a rotating mode, a driving motor is arranged on the supporting frame through a rotating groove, the driving motor is connected with the rotating ring through a rotating mechanism, and sealing assemblies are arranged on the upper end faces of the reaction kettles through feeding ports. An electric valve is arranged at the bottom of the reaction kettle through a discharge port, a stirring shaft is rotationally mounted on the reaction kettle, a plurality of stirring rods are mounted on the stirring shaft, the plurality of stirring shafts rotationally penetrate through the rotating ring and extend to the upper part of the rotating ring, and the stirring shafts are connected with the support frame through a transmission mechanism. The production efficiency can be improved, a plurality of reaction kettles can be used for processing potassium iodide at the same time, the yield in unit time is greatly increased, and the requirement of large-scale production is met.

The invention relates to the technical field of polypeptides, in particular to a linear peptide disulfide bond liquid phase cyclization method, potassium triiodide is adopted as an oxidizing agent, linear peptide and the oxidizing agent are dropwise added into a pH buffer solution at the same time for reaction, the cyclization concentration can reach 50-92.5 mg / mL, the solvent volume and the reaction time are greatly reduced, a reaction solution is easy to filter, and the yield is high. Compared with weak oxidants such as air (oxygen), DMSO and hydrogen peroxide, the method has the obvious advantages that the reaction time is short, the reaction is complete, the reaction solvent is less, the column purification efficiency is higher, and the phenomena of peroxidation and polymerization are basically avoided.

The invention provides a modified oleic acid imidazoline-sodium silicate hybrid composite corrosion inhibitor as well as a preparation method and application thereof, and belongs to the technical field of chemical corrosion prevention of oil and gas fields. The preparation method of the corrosion inhibitor comprises the following steps: carrying out condensation reaction on oleic acid and diethylenetriamine in the presence of a water carrying agent xylene and a catalyst p-toluenesulfonic acid to obtain oleic acid imidazoline; in isopropanol, under the catalysis of potassium iodide, oleic acid imidazoline and chlorododecane are subjected to quaternization modification reaction to obtain oleic acid imidazoline dodecyl quaternary ammonium salt; in water, under the action of a cross-linking agent epoxy chloropropane, the oleic acid imidazoline dodecyl quaternary ammonium salt and sodium silicate are subjected to a cross-linking hybridization reaction to obtain the product. The stability is remarkably improved through quaternization modification of the organic oleic acid imidazoline, the organic oleic acid imidazoline and the inorganic sodium silicate are hybridized and crosslinked to form the hybrid composite corrosion inhibitor, synergistic coverage of an organic adsorption film and an inorganic deposition film is achieved, the corrosion rate is remarkably reduced, and the corrosion inhibition performance and environmental adaptability of the corrosion inhibitor are improved.

This method produces water containing free iodine, which can be used to suppress slime and fouling, without the use of an oxidizing agent. [Solution] By irradiating water containing iodide, such as an aqueous potassium iodide solution (iodide-containing water), with ultrasonic waves using an ultrasonic transducer 31, free iodine is generated in the iodide-containing water.

The application provides a high-temperature-resistant red-free polarizing plate and a preparation method thereof. The preparation method comprises the following steps: first, swelling a polyvinyl alcohol film; then, dyeing the swollen polyvinyl alcohol film in a mixed solution of iodine solution and boric acid; then, cross-linking the polyvinyl alcohol film in a boric acid solution; then, stretching the cross-linked polyvinyl alcohol film in a mixed solution of potassium iodide and boric acid, and then, supplementing color of the stretched polyvinyl alcohol film in an aqueous solution of potassium iodide and boric acid; then, drying the polyvinyl alcohol film after the color supplementing; then, adhering inner protective films to upper and lower layers of the dried polyvinyl alcohol film through UV glue; and finally, drying the polyvinyl alcohol film, thereby preparing the high-temperature-resistant red-free polarizing plate. The prepared polarizing plate has an absorbance at 700 nm (A700) higher than 1.7, and satisfies a high-temperature five-hundred-hour durability test. The polarizing plate does not emit red light and has better weather resistance. Moreover, the preparation method is simple, does not need to add new processes or new substances, and has low cost.

The application provides a light-heat aging resistant polyamide resin and a preparation method and application thereof, raw materials for preparing the polyamide resin include reactive monomers and additives; the reactive monomers include binary acid and binary amine; the additives include a compounded heat stabilizer, the compounded heat stabilizer includes an amide bond containing compound, copper acetate and potassium iodide; by adding the amide bond containing compound, the copper acetate and the potassium iodide as the compounded heat stabilizer in the raw materials, the problem of thermal decomposition of the polyamide resin caused by high temperature is solved in the polymerization process, and then the light-heat aging resistance of the polyamide resin is effectively improved, and the production process and cost are not additionally increased.

The application discloses a preparation method of an IR-780 derivative which can be quickly targeted and accumulated in tumor tissues, and comprises the following steps: step 1, adding potassium iodide into a dry round-bottom flask provided with a magnetic stirrer, then replacing air sufficiently, adding substrates A and B under the condition of nitrogen protection, then adding super-dry solvent into the system, heating and refluxing for a certain time, removing excessive potassium iodide by filtering through diatomite after the reaction is completed, adding petroleum ether after the solvent is spun dry, fully stirring and repeatedly washing for several times, repeatedly washing with petroleum ether / ethyl acetate after the petroleum ether washing, and obtaining a pure red powder solid compound C after the washing is completed; it is tested that the long carbon chain substitution containing fluorine obviously accelerates the kinetics of distribution in vivo, but the rare tumor targeting property is reserved; compared with the tumor targeting organic compound IR-780, the derivative can be more quickly targeted and accumulated in tumor tissues after being intravenously injected into tumor-bearing nude mice.

The invention discloses a second-order vector hydrophone based on an electrochemical principle, and belongs to the technical field of MEMS sensors and acoustic measurement. The hydrophone comprises two electrochemical first-order vector hydrophones (100) which are hung on a rigid support (200) through springs (300), the distance between the two electrochemical first-order vector hydrophones (100) is far smaller than the wavelength of sound waves, and speed gradient second-order quantity measurement is achieved through a finite difference approximation method. A two-dimensional electrochemical vibrator is arranged in the electrochemical first-order vector hydrophone (100), an MEMS electrode chip is arranged in a flow channel of the electrochemical first-order vector hydrophone (100), an iodine-potassium iodide electrolyte system is adopted, and a vibration signal is converted into an electric signal through an electrochemical oxidation-reduction reaction. According to the invention, the sensitivity is enhanced by using the electrochemical gain effect and the horn-shaped liquid storage cavity structure, the two-dimensional integration is realized through the integral structure design, the first-order velocity and the second-order velocity gradient can be synchronously measured at the same point, and the sensor has the advantages of high directivity, low frequency, high sensitivity, miniaturization and the like, and is suitable for underwater low-frequency sound signal detection and target positioning.

The invention belongs to the technical field of oil field environmental protection, and discloses a method for recovering a high-density solid phase in waste shale gas oil-based drilling fluid, which comprises the following steps: 1) pretreatment: carrying out gel breaking and dehydration on the waste shale gas oil-based drilling fluid, then adding an organic solvent to extract a residual oil phase in the solid phase, and collecting the residual solid phase; 2) preparing a heavy liquid: adding potassium iodide into distilled water, stirring and dissolving, adding zinc iodide, and stirring and mixing to obtain the heavy liquid; and 3) separation treatment: mixing the collected solid phase and the heavy liquid according to a ratio of 1g: 8-15mL, oscillating, standing for 5-8 hours, and separating the solid phase with the density greater than that of the heavy liquid. According to the method, the treatment problem of the waste solid phase of the waste shale gas oil-based drilling fluid can be effectively solved, the solid phases of different densities of the waste oil-based drilling fluid can be fully separated, meanwhile, the method is easy and convenient to operate, accurate control over the density of the heavy liquid is achieved through the complexing effect of the potassium iodide and the zinc iodide heavy liquid, operation is easy and convenient, and secondary pollution is avoided.

The invention discloses a multi-reaction-mechanism positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of preparation of aqueous zinc ion battery positive electrode materials. The preparation method disclosed by the invention comprises the following steps: adding layered vanadium oxide into deionized water, then adding iodide, and stirring to obtain a mixed solution; sequentially centrifuging, washing, drying and grinding the mixture to obtain the multi-reaction-mechanism positive electrode material; the layered vanadium oxide comprises vanadium pentoxide; the iodide is lithium iodide, zinc iodide, ammonium iodide, calcium iodide, sodium iodide or potassium iodide. According to the method, volume expansion and structure collapse caused by repeated embedding / removing of Zn < 2 + > in the circulation process are inhibited, and the stability is improved.

The application discloses a kind of proton exchange membrane hydrogen production electrolysis catalyst and its preparation method, its preparation method includes the following steps: S1, iridium precursor salt and ruthenium precursor salt are dissolved in water, obtain solution A;S2, triblock copolymer P123 is dissolved in ethanol, obtain solution B;S3, potassium iodide is dissolved in water, obtain solution C;S4, the solution A, solution B and solution C are uniformly mixed and then transferred to reaction kettle, heated and reacted;S5, the product obtained in the step S4 is collected, and the iridium ruthenium alloy catalyst is obtained by centrifugation and washing.The solvent hot reduction method is used in the application, the triblock copolymer P123 is used as reducing agent and protective agent, ethanol is used as solvent, and potassium iodide is added to improve the catalyst size and crystallization degree, so that the iridium ruthenium alloy catalyst with high catalytic activity and high stability is obtained.

This acid / alkali recovery method is a method for separating a liquid to be treated, which is obtained by adding an acidic solution and an alkaline solution to a waste liquid containing boric acid and potassium iodide generated in a polarizing plate production process, into an acidic solution, an alkaline solution, and a mainly-boric acid-based treatment liquid by electrodialysis. The acid / alkali recovery method comprises: an NF membrane separation step for passing a liquid to be treated through an NF membrane to separate the liquid to be treated into a permeated liquid containing iodide ions and a concentrated liquid containing iodide ions at a lower concentration than the permeated liquid; and an electrodialysis step for passing the concentrated liquid through an electrodialysis device to separate the concentrated liquid into a mainly-boric acid-based treatment liquid, an acidic treatment liquid, and an alkaline treatment liquid.

The invention relates to a calcium iodide-based organic electrolyte, a secondary battery and a preparation method of the calcium iodide-based organic electrolyte, the electrolyte is composed of calcium salt, an organic solvent and an additive, the calcium salt is calcium iodide or a combination of calcium iodide and other calcium salt, the organic solvent is one or a combination of more of ether organic solvent, sulfone organic solvent, ester organic solvent, amide organic solvent, ionic liquid organic solvent and amine organic solvent; the additive is selected from one or more of lithium borohydride, sodium borohydride, potassium borohydride, zinc borohydride, magnesium borohydride, lithium iodide, sodium iodide, magnesium iodide, potassium iodide, tetraethyl ammonium borohydride, tetramethyl ammonium borohydride, benzyltriethyl ammonium borohydride and tetra-n-butylammonium borohydride. Compared with the prior art, the fluoride-free, thermodynamically stable and low-passivation-effect calcium iodide-based electrolyte provided by the invention can improve the interface property of a calcium metal negative electrode-electrolyte and increase the stability of the electrolyte, so that the cycle life of a calcium metal battery is prolonged, and the stability of the calcium metal battery is improved.

The invention provides a nano-enzyme synthesis method which comprises the following specific steps: sequentially heating, drying and grinding an aqueous solution containing 0-generation polyamide-amine dendritic macromolecules, potassium ferricyanide and urea, carrying out high-temperature pyrolysis twice, and grinding again to obtain the target nano-enzyme. The invention also provides a corresponding dichlorvos detection method, which comprises the following operation steps: mixing a sample solution, a buffer solution and a nano-enzyme solution for incubation, and then adding the mixed solution into a borate buffer solution containing hydrogen peroxide for reaction; and after the reaction is finished, sequentially adding a potassium iodide solution and a rhodamine 6G solution, and carrying out fluorescence detection after the reaction is finished. The nano-enzyme synthesized by the method has multiple enzymatic characteristics of oxidase-like, peroxidase-like, catalase-like and superoxide dismutase-like, has the advantages of excellent selectivity and high sensitivity in detection of dichlorvos, and is suitable for rapid detection of dichlorvos in actual samples.