102 results about "Potassium ferrocyanide" patented technology

The invention discloses a high-heat-power thermoelectric cell hydrogel for low-grade heat energy collection and a preparation method thereof, and belongs to the technical field of heat energy recovery. The polyacrylamide hydrogel is selected as a substrate of the thermoelectric cell hydrogel, so that a hydrogel internal structure which is easy to regulate and control can be obtained; excellent hydrogel stretchability is obtained by using a cross-linking agent and an initiator with relatively low concentration; potassium ferricyanide and potassium ferrocyanide are used as redox ions to generate a thermoelectric effect, so that stable P-type thermal power is obtained; by using guanidine hydrochloride, the solvation entropy difference between potassium ferricyanide and potassium ferrocyanide is enlarged, and the thermal power of the hydrogel in the thermoelectric cell is greatly improved; sodium pyrrolidone carboxylate is used, so that the concentration of ions in the hydrogel is further improved, the conductivity of the thermoelectric cell hydrogel is improved, meanwhile, a hydrogen bond network between water molecules is destroyed, and the water-retaining property of the thermoelectric cell hydrogel is improved.

The invention relates to the technical field of nano-enzyme preparation and electrochemical and colorimetric dual-mode sensing, and particularly discloses a Mn3Fe2.7-atC nano-enzyme, a preparation method thereof and application of the Mn3Fe2.7-atC nano-enzyme in determination of amoxicillin content. The preparation method of the Mn3Fe2.7 at C nano-enzyme is characterized by comprising the following steps: dissolving manganese chloride and trisodium citrate in water to prepare a solution A; dissolving potassium ferricyanide in water to prepare a solution B; adding the solution B into the solution A under a stirring condition, continuously stirring for 16-32 hours after the solution B is added, carrying out suction filtration, and drying the obtained precipitate to obtain a ferromanganese prussian blue analogue precursor; and placing the ferromanganese prussian blue analogue precursor in a tubular furnace, carrying out pyrolysis, and after the pyrolysis is finished, carrying out acid soaking, washing and drying to obtain the Mn3Fe2.7 at C nano-enzyme. When the Mn3Fe2.7 (at) C nano-enzyme is used for measuring the content of amoxicillin, the accuracy is good, and meanwhile, the Mn3Fe2.7 (at) C nano-enzyme has the advantages of interference resistance, stability, good recovery rate and the like.

The invention provides a low-cyanide gold leaching agent system and a dump leaching process thereof, and belongs to the technical field of hydrometallurgy. According to the method, a synergistic process of'interface activation, cyanide etching and iron precipitation inhibition 'is constructed by designing a low-cyanide gold leaching agent system. The amino acid auxiliary leaching agent adsorbs the gold surface to weaken lattice energy, so that the etching efficiency of trace cyanide ions is improved; mercapto-containing malic acid is used as a chelating agent, specific mercapto in molecules of the mercapto-containing malic acid and iron ions form an ultrahigh-stability water-soluble complex, generation of ferric hydroxide precipitates is thoroughly blocked, ferrous ions stabilized by the chelating agent are subjected to in-situ oxidation through dissolved oxygen and efficiently regenerated into potassium ferricyanide, and accumulation of free cyanogens in a solution system is eliminated; meanwhile, a chelating agent-iron complex forms a self-buffering pair, the pH of the dump leaching solution is accurately controlled, and secondary precipitation caused by local alkalization is prevented. According to the process, under the synergistic effect that the core chelating agent guarantees permeation stability and the leaching aid accelerates gold dissolution, the heap leaching period is compressed to 45 days.

The invention belongs to the technical field of thermoelectric materials and functional polymer materials, and particularly relates to thermoelectric hydrogel based on synergistic enhancement of zwitterions and a polar solvent as well as a method and application of the thermoelectric hydrogel. The thermoelectric hydrogel is obtained through the steps that a precursor solution is subjected to a polymerization reaction to form a gel matrix, then the gel matrix is soaked in a soaking solution, potassium ferricyanide / potassium ferrocyanide redox couple is introduced, and the thermoelectric hydrogel is obtained, and the precursor solution is prepared from acrylamide, N-isopropylacrylamide, dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide and N, N-dimethylformamide. The photoinitiator is prepared by mixing N, N-dimethylformamide, 1-ethyl-3-methylimidazolium tetrafluoroborate, a zwitterionic monomer [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, a cross-linking agent N, N '-methylene bisacrylamide, a photoinitiator and deionized water. The thermoelectric hydrogel prepared by the invention has high mechanical strength, high ductility and high Seebeck coefficient, and has better temperature resistance.

The invention discloses a core-shell nano-enzyme composite spray gel dressing and a preparation method and application thereof.The dressing comprises a component A prepared from sodium alginate, N-isopropylacrylamide PNIPAM, core-shell nano-enzyme and curcumin and a component B of a divalent metal salt solution, and the component A and the component B are sprayed at the same time to form the core-shell nano-enzyme composite spray gel dressing. The preparation method of the core-shell nano enzyme comprises the following steps: mixing potassium ferrocyanide, ferric trichloride and polyvinylpyrrolidone to obtain a Prussian blue nano particle precursor solution; carrying out ultrasonic emulsification treatment and replacement on the curcumin core solution and the Prussian blue nanoparticle precursor solution; and freeze-drying to obtain the core-shell nano-enzyme. Through rapid ionic crosslinking of sodium alginate and divalent metal ions and the temperature-sensitive phase change characteristic of the temperature-sensitive polymer poly (N-isopropylacrylamide), the gel dressing is rapidly formed, the damaged skin is effectively covered and protected, the excellent antioxidant, anti-inflammatory and antibacterial capabilities are achieved, and the healing cycle of the radiodermatitis wound can be remarkably shortened.

The present invention relates to a method for producing a composite adsorbent of ferrocyanide of a transition metal in the matrix of silica gel comprising the following steps: (i) preparing a first aqueous composition comprising at least the mixture of a sodium or potassium ferrocyanide with a sodium silicate solution so as to obtain the dissolution of salts; (ii) preparing a second composition comprising the mixture of at least: a transition metal salt chosen from one or more of the following compounds: nickel, copper, zinc, cobalt, and an inorganic acid; (iii) mixing the first aqueous composition with the second composition until a suspension is obtained; (iv) adding an inorganic acid or base so that the suspension obtained at the end of step (iii) has a pH ranging from 4 to 9;(v) demixing the suspension obtained at the end of step (iv) so as to obtain a precipitate within a liquid phase; (vi) separating said precipitate, rinsing and drying the precipitate, so as to obtain a solid precipitate, characterized in that the first aqueous composition comprises a soluble rubidium or cesium salt, and the second composition further comprises a soluble metal salt chosen from one or more of the following compounds: aluminum, titanium, zirconium.;

The invention discloses a heating cigarette preparation method, a heating cigarette and an aerosol tracing analysis method.The heating cigarette preparation method comprises the following steps that potassium ferrocyanide is added into tobacco shreds, and tobacco shred sections are prepared; adding ferric chloride hexahydrate into the filter stick to obtain a tracing filter stick; the tobacco shred section and the tracing filter stick are combined to form a heating cigarette, aerosol generated when the heating cigarette is smoked generates a blue irreversible chromogenic reaction in the tracing filter stick, and therefore the circulation path of the aerosol in the tracing filter stick is displayed. According to the method, through the blue irreversible chromogenic reaction of potassium ferrocyanide and ferric chloride hexahydrate when the potassium ferrocyanide and the ferric chloride hexahydrate meet, the problem that the actual circulation path of cigarette heating aerosol cannot be truly fed back through a traditional cigarette fuming section replacement method is successfully avoided, and the circulation paths of the aerosol in the axial direction and the radial direction of different functional sections of the filter stick are clearly displayed.

The invention belongs to the technical field of adsorption material preparation, and relates to an anion defect type prussian blue analogue and a preparation method and application thereof in cesium adsorption.The preparation method comprises the steps that imidazole and halogenated alkane are subjected to an alkylation reaction and anion exchange to prepare ionic liquid, and after water is added, an ionic liquid-water mixed solvent is obtained; the method comprises the following steps: respectively dissolving transition metal nitrate and potassium ferrocyanide into an ionic liquid-water mixed solvent, dropwise adding a potassium ferrocyanide solution into a transition metal nitrate solution, and stirring to obtain a mixed solution; and carrying out hydrothermal reaction on the mixed solution, cooling to room temperature, washing the material, and drying to obtain the anion defect type prussian blue analogue. The cesium ion adsorption capacity and the cesium ion cycling stability are improved by precisely regulating and controlling anion defects in the Prussian blue analogue, and the cesium ion adsorption material has good ion interference resistance in a complex water environment and shows excellent adsorption selectivity and a wide application range.

The invention relates to the technical field of new energy storage, and discloses a thermoelectric energy storage battery, comprising: a sulfur gradient doped copper ferrocyanide positive electrode; a copper negative electrode; a thermal response type gradient concentration electrolyte; an asymmetric heat exchange layer; the photovoltaic panel material layer is deposited on the battery shell; a preparation method of a thermoelectric energy storage battery comprises the following steps: S1, coprecipitating a copper nitrate solution and a potassium ferricyanide solution at a flow rate of 0.1-0.3 ml / min at 4-6 DEG C to generate a nano precursor; and S2, in a mixed atmosphere of H2S and N2, annealing is performed at 250-320 DEG C, the volume fraction of H2S is linearly adjusted from 10% to 30% along with the temperature, and sulfur gradient doping is formed. By constructing a sulfur gradient doped copper ferrocyanide positive electrode structure, stable electrochemical response of the material in a thermally driven environment is realized, and the problems of non-uniform lattice expansion and low interface charge migration efficiency in a thermal field are solved.

The utility model discloses a ureter for detecting hemeroflavin in urine. The ureter comprises a bottle body, a bottle cap and a piston rod, a first preset cavity and a second preset cavity are formed in the bottle body, and detection solutions are respectively preset in the first preset cavity and the second preset cavity; the bottom of the piston rod extends outwards to form a first branch rod and a second branch rod, and the bottom ends of the first branch rod and the second branch rod are provided with a first piston and a second piston respectively. And the first piston and the second piston are respectively arranged in the first preset cavity and the second preset cavity. During detection, urine to be detected is taken and added into the bottle body, a potassium ferrocyanide solution and a hydrochloric acid solution automatically flow out of the preset cavity to form a mixed solution with the urine while the bottle cap is screwed, then the mixed solution precipitates in the precipitation cavity, and whether blue precipitates exist or not is observed so as to judge a detection result. The two preset solutions are mixed in a sealed state, and gas generated after mixing cannot be released into air, so that the medical staff is prevented from being in contact with the gas during detection, and the health of the medical staff is prevented from being damaged.

The present application belongs to the technical field of salt lake resource development and resource utilization, and particularly relates to a method for extracting rubidium based on fiber evaporation adsorber and space separation. The method uses commercial fibers with capillary transport capacity as base material, and in-situ grows copper potassium ferrocyanide and other selective adsorbents in the upper region of the fibers to construct a micro-scale cooperative system integrating capillary transport, interface evaporation, step-by-step crystallization and selective adsorption. The raw material liquid ascends along the fibers and is continuously concentrated, and the competitive ions with higher concentration and lower solubility are preferentially crystallized in the lower part of the fibers. Rubidium is relatively enriched and crystallized in the upper part of the fibers, and is selectively adsorbed by the upper adsorbent. Finally, the rubidium-containing solution is obtained by desorption. The present application can reduce the interference of Na + , K + and other competitive ions, simplify the solid-liquid separation process, and improve the separation selectivity and recovery efficiency of rubidium.

The application discloses an anti-caking salt product and a preparation method thereof. The anti-caking salt product comprises raw salt and an anti-caking agent, the anti-caking agent is food-grade ferric tartrate, and the addition amount of the anti-caking agent is 0.05-0.106 g / kg of the salt. The core of the anti-caking method of the salt lies in that the food-grade ferric tartrate is used as the main anti-caking agent, the addition amount is 0.05-0.106 g / kg of the salt, the salt is dried at 100 DEG C for 4 hours, then the anti-caking agent is added, and the water vapor transmission rate is less than or equal to 0.5 g / m 2 24h of high-barrier material packaging, while 6 g of quicklime or 2 g of calcium chloride desiccant is added in every 200 g of the salt. The application also controls the Mg 2+ content in the salt to be less than or equal to 0.02%, the KCl content to be less than or equal to 10%, and the particle size to be in the range of 0.45-0.6 mm, so that the salt caking is synergistically inhibited from multiple dimensions. The method has extremely significant anti-caking effect (the caking rate is only 8.7% after 15 days of open storage), is safe and economical, and has a simple process, and can effectively replace or reduce the use of potassium ferrocyanide, and is suitable for large-scale industrial production.

The invention relates to the technical field of metal stators, and provides a carbonitriding process of a metal stator for a screw drill, which comprises the following steps: preheating the metal stator, and then carrying out salt bath carbonitriding and salt bath oxidation treatment to obtain the metal stator for the screw drill; during salt bath carbonitriding, a carbonitriding agent comprises the following components in parts by weight: 24 parts of a composite carbon material, 10-15 parts of ammonium chloride, 4-8 parts of urea, 3-6 parts of yttrium oxide, 4-8 parts of potassium ferrocyanide and 10-15 parts of potassium chloride; raw materials of the composite carbon material comprise charcoal, carbon nanotubes and light calcium carbonate. According to the technical scheme, the problem that a metal stator is poor in wear resistance in the prior art is solved.

The invention relates to the technical field of natural rubber processing, and particularly discloses a natural rubber latex preservative and a preparation method thereof. The preservative is prepared from modified nano titanium dioxide, ethylparaben, enzymolysis chitosan, immobilized lysozyme, pentaerythritol ester, sodium hydrosulfite, rosmarinic acid, potassium ferrocyanide, an acrylic acid-chitosan copolymer and the balance of deionized water. The preparation method comprises the steps of enzymolysis chitosan solution preparation and enzyme compounding, organic phase emulsification, nano component ultrasonic dispersion and vacuum defoaming aging, wherein the intermittent ultrasonic temperature control process guarantees the biological activity. The preservative can replace traditional ammonia water to be used for natural latex preservation, and has the advantages of being high in bacteriostasis and oxidation resistance synergism, high in colloid stability, environmentally friendly, safe and free of residues; according to the preparation method, through low-temperature enzyme protection and nano interface engineering innovation, the problems of biological inactivation and particle agglomeration in a traditional process are solved, and efficient and green production is achieved.

The invention discloses a method for detecting sialic acid in a dairy product. The method comprises the following steps: pretreating raw materials: weighing a uniformly mixed liquid dairy product, adding water for diluting, adding a precipitant consisting of potassium ferrocyanide and zinc acetate, uniformly shaking, adding water for fixing the volume, uniformly shaking, and filtering with a filter membrane of 0.5 mu m or less to obtain a filtrate; the concentration of the liquid dairy product is 1-10g / 100mL, the concentration of the potassium ferrocyanide is 0.1-0.26 g / 100mL, and the concentration of the zinc acetate is 0.2-0.55 g / 100mL after the water is added to a constant volume; a chromatographic column is a hydrogen type cation chromatographic column, a 0.005-0.01 mol / L sulfuric acid aqueous solution is used as an eluent for isocratic elution, and after elution, a PAD detector is adopted for detection under the detection wavelength of 210-220 nm. The method is suitable for detecting sialic acid in milk, and has the advantages of simple sample treatment, low treatment cost and accurate detection.

The present invention belongs to the technical field of porous materials, and specifically relates to a mesoporous Fe-g-C3N4 catalyst support, a preparation method thereof, and an application thereof in enzyme loading. The mesoporous Fe-g-C3N4 catalyst support provided by the present invention is prepared by a one-step thermal shrinkage polymerization method from potassium ferrocyanide and melamine. The mass fraction of Fe element in the mesoporous Fe-g-C3N4 catalyst support is 1% - 5%; the pore diameter of the mesopores in the mesoporous Fe-g-C3N4 catalyst support is 10 - 30 nm. The mesoporous Fe-g-C3N4 catalyst support not only has excellent photo-Fenton catalytic performance, and its degradation ability for pollutants is significantly better than that of g-C3N4; moreover, the special pore size and the hydroxyl and amino groups on the surface of the Fe-g-C3N4 catalyst support of the present invention enable it to be an excellent support for biological enzymes. While improving the stability of the immobilized enzyme, it does not affect the catalytic activity of the biological enzyme, and has great application prospects in immobilized enzymes.

The application relates to a preparation method of a poly-pyrrole-prussian blue hybrid photothermal nanolaser, polyvinylpyrrolidone is added into deionized water and stirred until completely dissolved, pyrrole and potassium ferrocyanide are added into the obtained polyvinylpyrrolidone solution, stirring is uniformly conducted, then ferric chloride hexahydrate is added, sufficient stirring and reaction are conducted, a reaction liquid is obtained, after the precipitation is removed through centrifugation, the supernatant is dialyzed and vacuum freeze-dried, and the poly-pyrrole-prussian blue hybrid photothermal nanolaser is obtained.Compared with the prior art, the method has lower requirements on equipment, mild reaction conditions, is green and environment-friendly, is suitable for large-scale production, the prepared photothermal nanolaser has good photothermal ablation effect under the irradiation of near-infrared light, can significantly inhibit the growth of tumor cells, the photothermal nanolaser also has good oxygen production performance, can decompose hydrogen peroxide to generate oxygen, and can further improve the tumor hypoxic microenvironment and enhance the in-situ thermal ablation treatment effect of the tumor, thereby providing a potential technical means for relieving the tumor hypoxic microenvironment and strengthening the in-situ thermal ablation.

The invention provides a method for qualitatively or quantitatively detecting urea in grains or distiller's yeast, and belongs to the technical field of food detection. The pretreatment method for detecting urea in grain or distiller's yeast provided by the invention comprises urea extraction and derivation steps: the urea extraction step comprises the following steps: mixing a grain or distiller's yeast sample with activated carbon, a zinc acetate solution and a potassium ferrocyanide solution, carrying out ultrasonic treatment, filtering with medium-speed filter paper, discarding 1-2mL of primary filtrate, and collecting subsequent filtrate as a sample solution; the derivation method comprises the following steps: mixing a sample solution, a 9-hydroxyton solution and a hydrochloric acid solution, placing in a dark place, and filtering to obtain a to-be-detected solution; according to the pretreatment method provided by the invention, interference substances in the sample are removed through the steps of activated carbon adsorption, zinc acetate and potassium ferrocyanide precipitation, the matrix effect is reduced, further, 9-hydroxyton is adopted as a derivatization reagent and reacts with urea to generate a fluorescent derivative, the extraction efficiency is high, and the detection sensitivity and accuracy are improved.

The embodiment of the invention provides a preparation method and application of a nickel potassium ferrocyanide template adsorbent. The method comprises the following steps: providing a cesium ferrocyanide solution; performing first mixing on the cesium ferrocyanide solution and a nickel source to obtain a cesium nickel ferrocyanide precursor; and carrying out second mixing on the cesium nickel ferrocyanide precursor and a potassium salt solution to obtain the potassium nickel ferrocyanide template adsorbent. The potassium nickel ferrocyanide template adsorbent prepared by the method disclosed by the invention has relatively good selective adsorption capacity on cesium ions in a cesium-containing solution, and is particularly suitable for adsorbing Cs < + > in a high-salt solution.

The present application relates to the technical field of aircraft maintenance cleaning, and provides an aircraft surface salt removal and prevention cleaning agent and a cleaning method, the cleaning agent comprising the following components in percentage by mass: 0-30% of glycerol, 15-30% of a composite metal protective agent and 2-5% of an anti-salt protective agent, and the balance being distilled water, the composite metal protective agent comprising organic amine, organic acid, ethoxylated phosphate ester and benzotriazole, and the anti-salt protective agent comprising polydimethylsilane emulsion and potassium ferrocyanide; the cleaning agent effectively avoids the corrosion of salt water solution on the aircraft body material, especially metal material and metal plating, during the cleaning process, has good corrosion protection effect, and through the steps of rinsing and air drying or wiping, a protective film can be formed on the surface of the aircraft body, the crystallization of chlorides on the surface of the aircraft body is destroyed, the adhesion is reduced, the re-salting speed is effectively slowed down, and the cleaning agent is especially suitable for the salt removal and maintenance cleaning of military shipboard aircraft and near-shore military aircraft which are exposed to high-salt marine environment for a long time and have long-time low-altitude flight during flight.

The invention relates to a wafer-level gold etchant which is characterized by being prepared from the following raw materials in percentage by weight: 8-12% of a sodium thiosulfate solution, 28-32% of a thiourea solution, 8-12% of a potassium ferricyanide solution and 48-52% of a potassium iodide solution. The wafer-level gold corrosive liquid disclosed by the invention has the advantages that the wafer-level gold corrosive liquid can be widely applied to a circuit which has a gold film layer thickness of more than 0.5 mu m and has a relatively high requirement on sidetrack control, so that the problems of overlarge sidetrack, line CD (Compact Disc) over-limit and even metal falling caused by corrosion of the original gold corrosive liquid are avoided. When the wafer-level gold etching liquid is used for etching, smaller sidetracking is achieved, a process window is wider, process compatibility is better, and process support is provided for high-speed and high-power photoelectric semiconductors and micro-system devices.

The invention relates to a fluorescence and colorimetric dual-mode biosensing method for detecting caffeine and application thereof, the method causes CRISPR / Cas13a to regulate and control Fe-MOFs to fall off from a signal probe based on to-be-detected liquids with different concentration gradients, the fallen Fe-MOFs collapses under the action of sodium pyrophosphate to release 2-aminoterephthalic acid and ferric ions, and the 2-aminoterephthalic acid and ferric ions are subjected to fluorescence and colorimetric dual-mode biosensing method is used for detecting caffeine. 2-aminoterephthalic acid is converted into a fluorescence signal, meanwhile, Prussian blue generated by reaction of ferric ions and potassium ferrocyanide is converted into a colorimetric signal, and a fluorescence and colorimetric dual-mode biosensing method is constructed; according to the sensor, interference factors can be effectively eliminated by outputting two detection signals and performing cross validation; the advantages of high sensitivity and wide linear range of a fluorescence method and the advantages of simple operation and visual result of a colorimetric method are combined, so that a target object can be accurately recognized, the lower detection limit can be reduced, and the accuracy of a quantitative result can be ensured; according to the sensing method, visual observation can be achieved, precise instruments are not needed, and good application value is achieved.

The invention discloses a method for preparing phase-stable ammonium nitrate in a eutectic mode, and belongs to the technical field of crystal preparation. The eutectic method specifically comprises the following steps: (1) adding ammonium nitrate into water, heating and dissolving to obtain an ammonium nitrate saturated solution; (2) adding potassium ferrocyanide into the ammonium nitrate saturated solution, and stirring for reaction to obtain an ammonium nitrate / potassium ferrocyanide mixed solution; and (3) drying and grinding the ammonium nitrate / potassium ferrocyanide mixed solution to obtain the ammonium nitrate / potassium ferrocyanide eutectic. According to the invention, the AN / KFCT eutectic with the mass ratio of 3-4% is prepared by adopting an evaporative crystallization method through a eutectic technology, the phase change problem of ammonium nitrate in storage, transportation and use temperature ranges is solved, meanwhile, the structure-activity relationship between the crystal form and thermal stability is constructed, the thermal stability of ammonium nitrate is improved through crystal form regulation and control, and the application range of ammonium nitrate is widened. The invention provides a unique idea for solving the phase change of ammonium nitrate, and has application value.

The invention provides a preparation method of a Fe-doped NiCoP nanosheet array rich in phosphorus defects, which comprises the following steps: firstly, adding foamed nickel into a reaction solution containing cobalt salt, 2-methylimidazole ligand and deionized water, and growing a Co-ZIF-L nanosheet array on a substrate after reaction; then the Co-ZIF-L is added into a potassium ferrocyanide solution, and Fe-Co PBA is obtained after a reaction; then, sodium hypophosphite is used as a phosphorus source, and the Fe-Co PBA is subjected to phosphating in a tubular furnace to generate Fe-NiCoP; and finally, the Fe-NiCoP is reduced in the H2 / Ar atmosphere, and the Fe-doped NiCoP nanosheet array rich in phosphorus defects is obtained. The number of active sites, conductivity and stability of the material are increased by utilizing construction of a hollow structure and introduction of phosphorus defects, so that the electric hydrolysis performance is improved.

The present invention relates to a process for producing a composite ferrocyanide adsorbent of a transition metal in the silica gel matrix comprising the following steps: (i) the preparation of a first aqueous composition comprising at least a mixture of a sodium or potassium ferrocyanide with a sodium silicate solution so as to obtain the dissolution of salts; (ii) the preparation of a second composition comprising a mixture of at least: a transition metal salt selected from one or more of the following compounds: nickel, copper, zinc, cobalt, and an inorganic acid; (iii) the mixing of the first aqueous composition with the second composition until a suspension is obtained; (iv) the addition of an inorganic acid or base so that the suspension obtained at the end of step (iii) has a pH ranging from 4 to 9;(v) the separation of the suspension obtained at the end of step (iv) so as to obtain a precipitate within a liquid phase; (vi) the separation of said precipitate, the rinsing and drying of the precipitate, so as to obtain a solid precipitate, characterized in that the first aqueous composition comprises a soluble salt of rubidium or cesium, and the second composition further comprises a soluble salt of metal selected from one or more of the following compounds: aluminium, titanium, zirconium.;

According to the environment-friendly rust transforming agent and the preparation method thereof, a tea polyphenol-tannic acid-ascorbic acid-sodium gluconate food-grade quaternary synergistic transformation system is constructed, chelate precipitation is inhibited through specific coordination of sodium gluconate and Fe < 3 + >, and the problem that an existing plant extract transforming agent is prone to losing efficacy during storage is solved; the reaction endpoint is quantitatively judged through the pH response of the purple cabbage anthocyanin and the potassium ferrocyanide-Fe < 3 + > chromogenic reaction, and the visualization is good; the device has the advantages of being safe, non-toxic, low in cost, high in stability, high in education adaptability and the like, can be widely applied to household metal appliance maintenance, small metal handicraft protection and teenager chemical experiment teaching, and has remarkable application value.

This invention discloses a method for preparing pore-structure-tunable iron-manganese Prussian blue nanomaterials and their applications. Potassium ferrocyanide is used as the iron source. Polyvinylpyrrolidone is added and mixed with hydrochloric acid until fully dissolved. Then, potassium permanganate powder is added and stirred again until dissolved. The mixture is transferred to a high-temperature reactor, where it is reacted completely under different hydrothermal conditions and then naturally cooled to room temperature. The resulting product is centrifuged, washed, and dried in a vacuum drying oven to obtain a series of porous iron-manganese Prussian blue nanomaterials. The porous iron-manganese Prussian blue nanomaterials prepared by this invention can activate PMS and exhibit degradation properties to 10 ppm methylene blue solution. This invention uses a hydrothermal method to prepare pore-structure-tunable iron-manganese Prussian blue nanomaterials. This invention features high economic efficiency, a simple preparation process, and the potential for large-scale industrial production, demonstrating good economic and environmental benefits.

According to the micro-plastic detection method, a glassy carbon electrode is used as a working electrode, a platinum wire electrode is used as a counter electrode, an Ag / AgCl electrode is used as a reference electrode, and potassium ferricyanide / potassium ferrocyanide is used as an electrochemical signal molecule; the method comprises the following steps: putting a three-electrode system into a KCl electrolyte solution which contains a microplastic and contains a potassium ferricyanide / potassium ferrocyanide probe, connecting the three-electrode system into an electrochemical workstation, then carrying out electric incubation on a solution system by using a cyclic voltammetry method, and detecting the concentration of the microplastic by using a differential pulse voltammetry method after incubation is finished. According to the invention, the electrochemical technology is innovatively used for micro-plastic detection. By utilizing the characteristic that micro-plastic is easily adsorbed on the surface of a glassy carbon electrode, an electric incubation method is adopted to enhance adsorption and reduce response of signal molecules, so that an electrochemical sensing detection method is established. The method has the advantages of rapidness, simplicity, low cost and the like, can be used for effectively detecting the micro-plastics in a wider range and keeping good sensitivity, and has a wide application prospect.

The present invention discloses a method for preparing a bacterial nanocellulose-based ternary thermoelectric gel electrolyte and its application. The method comprises the following steps: first, potassium ferrocyanide, potassium ferrocyanide, and lithium chloride are stirred and dissolved in deionized water to obtain an electrolyte solution; then, a bacterial nanocellulose hydrogel is immersed in the electrolyte solution for sufficient ion permeation; then, guanidine chloride is added and slowly stirred until uniform crystals form within the gel, thereby obtaining a nanocellulose-based ternary thermoelectric gel electrolyte. The ternary thermoelectric gel electrolyte prepared by the present invention exhibits high thermoelectric performance, excellent mechanical robustness, and antifreeze and anti-drying properties, and can be used to construct high-performance gel thermoelectric batteries.