155 results about "Complex ions" patented technology

The invention discloses a complex electrolyte additive for a battery, an aqueous zinc ion battery electrolyte and an aqueous zinc ion battery. The electrolyte additive is a complex containing metal complex ions; the complex is composed of a central ion and an internal ligand. The electrolyte additive can respectively form metal and alloy electrode-electrolyte interfaces on the surface of a zinc negative electrode through replacement and electrochemical reaction, and regulate and control the deposition behavior of zinc ions to inhibit the generation of zinc dendrites and accelerate deposition / dissolution kinetics, so that the service life of the zinc negative electrode is remarkably prolonged, and the rate capability is enhanced; a solvation structure of zinc ions can be regulated and controlled, side reactions such as hydrogen evolution, corrosion and passivation are slowed down, and capacity fading of the water-based zinc ion battery can be remarkably delayed when the positive electrode is coupled with a high-efficiency positive electrode; meanwhile, the aqueous zinc ion battery electrolyte additive is low in price, green, environment-friendly, high in functionality and beneficial to development of an aqueous zinc ion battery electrolyte and an aqueous zinc ion battery which are excellent in performance, safe, environment-friendly and low in cost.

The invention belongs to the technical field of bioengineering medicines, and particularly relates to a gel dressing for repairing skin wounds and a preparation method of the gel dressing. The anti-fouling coating is prepared from the following raw materials in parts by weight: 65 to 75 parts of polyvinyl alcohol, 14 to 20 parts of sodium alginate, 4 to 8 parts of sodium carboxymethyl cellulose, 1 to 3 parts of sodium hyaluronate, 12 to 22 parts of glycerol, 1 to 3 parts of surface anti-fouling additive, 6 to 10 parts of antibacterial microcapsule and 2 to 2.8 parts of compound ion. According to the invention, a PVA freeze-thaw physical network and an alginic acid Ca / Zn composite ion network cooperate to limit a pore channel, so that stable forming is realized; a chitosan / sodium tripolyphosphate microcapsule is prepared from polyhexamethylene biguanide hydrochloride and covered with sodium alginate, release sensitive to pH / ionic strength, acceleration in an inflammation stage and self-limiting in a later stage are constructed, and long-acting bacteriostasis is formed by SA-Zn site slow release; the stability and staged adaptation are highlighted through processes such as encapsulation, low-shear doping and the like and raw material synergy.

The invention discloses a rapid enrichment-atomic absorption spectrum analysis method for low-content gold in gold ore, and relates to the technical field of gold ore analysis and detection.The rapid enrichment-atomic absorption spectrum analysis method comprises the following steps that an ore sample and a solid composite additive are mixed and roasted at the low temperature of 500-650 DEG C, and the additive contains alkali metal carbonate and zinc oxide; sulfur fixation, catalytic oxidation of organic carbon and stabilization of volatile elements can be synchronously realized; the method comprises the following steps: roasting gold-loaded activated carbon, dissolving the gold-loaded activated carbon in aqua regia to obtain a to-be-enriched solution, enabling the solution to pass through an adsorption column filled with modified activated carbon, pretreating the activated carbon with a 1-10% ammonium citrate solution to improve the selective adsorption capacity of the activated carbon on gold chloride complex ions, ashing the gold-loaded activated carbon, dissolving residues, fixing the volume, and measuring by using an atomic absorption spectrometry. According to the rapid enrichment-atomic absorption spectrum analysis method for the low-content gold in the gold ore, through cooperation of low-temperature roasting of the composite additive and selective adsorption of the modified activated carbon, the decomposition efficiency and enrichment selectivity of the ore difficult to treat are improved.

The invention relates to a coprecipitation method for preparing cobaltosic oxide, which comprises the following steps: mixing a cobalt salt solution, a precipitant solution and a complexing agent solution in a carbonate base solution in a parallel flow manner, and carrying out first coprecipitation reaction to a first particle size to obtain a seed crystal; the cobalt salt solution, the precipitant solution and the complexing agent solution are mixed in a parallel flow mode, a second coprecipitation reaction is conducted, and cobalt carbonate powder is obtained; calcining the cobalt carbonate powder to obtain cobaltosic oxide with a median particle size D50 of 18-20 [mu] m; a complexing agent in the complexing agent solution is iminodiacetic acid. According to the invention, by using the specific complexing agent, cobalt ions exist in the system in the form of complex ions and are slowly released in the reaction process, so that the first coprecipitation reaction can be carried out orderly, and the cobaltosic oxide with the median particle size D50 of 18-20 [mu] m can be obtained.

The present invention provides a method for preparing silver-coated copper powder, which relates to the technical field of metal powder preparation. This preparation method directly prepares a copper core by chemical reduction method, then uses electroless plating method to grow a silver layer on its surface, and finally uses jet milling to improve the density of the powder. In the present invention, reducing agents with different reduction effects are added twice to reduce copper sulfate, which reduces the initial reaction rate, makes the whole reaction stable, and improves the sphericity of copper crystal nuclei. At the same time, sulfate radicals in the reaction system can form silver sulfate precipitation with silver ions in the subsequent reaction, further slowing down the reduction rate of silver ammonia complex ions and enabling the dense growth of the silver layer. At the same time, the unreacted completely glucose remaining in the reaction system can continue to reduce silver ammonia complex ions when silver ammonia solution is added dropwise later. By strictly controlling the growth rate of silver powder from crystal seeds to particles, the present invention reduces the structural defects caused by rapid growth and improves the performance of the final product.

The application discloses a method for selectively extracting fluorine from a fluorine-containing aqueous solution based on complex extraction, which comprises the following steps: (1) adding a fluorine complex cation to the fluorine-containing aqueous solution to obtain a solution containing metal-fluorine complex ions; and (2) mixing a saponified organic phase with the solution containing the metal-fluorine complex ions and separating phases to obtain a fluorine-loaded organic phase and a raffinate after fluorine removal. The method can achieve the purpose of deep fluorine removal.

The invention provides a composite hydrogel lithium ion sieve and a preparation method thereof, and belongs to the technical field of lithium ion sieve adsorption. The catalyst is characterized in that the active component of the ion sieve is H2TiO3, the binder is polyacrylamide (PAM), and the ion sieve is uniformly dispersed in the polyacrylamide. The composite lithium ion sieve is used for selective adsorption extraction of lithium ions in low-concentration geothermal water, oil and gas field water, salt lake brine and seawater. The H2TiO3 and PAM composite lithium ion sieve provided by the invention has the advantages of high adsorption capacity, good structural stability, high selectivity for salt lake brine with a high magnesium-lithium ratio, easiness in separation of the composite ion sieve from a liquid solution and good regeneration repeatability, and has a good industrial application prospect.

The invention provides a method for recovering rhodium in organic residual liquid containing triphenylphosphine / phosphine oxide, and relates to the technical field of precious metal recovery, and the method comprises the following steps: S1, carrying out reduced pressure rectification on the organic residual liquid containing triphenylphosphine / phosphine oxide to remove volatile components until the indexes of the residual liquid meet the feeding requirements of a subsequent process, and collecting light components for independent storage; s2, adding an acidic medium into the organic phase after light component removal, stirring and heating, introducing an oxidizing agent to carry out oxidation-complexation reaction, maintaining reaction conditions until the reaction is complete, standing for phase splitting, and collecting a water phase containing rhodium complex ions; according to the method, a core process combining oxidation-chlorination transfer and anion exchange adsorption is adopted, and key parameters of each process are accurately controlled, so that the rhodium recovery rate is stabilized at 95% or above, the rhodium content in the residual liquid can be reduced to 5 ppm or below, the industrial emission standard is completely met, and compared with the prior art, the resource recovery efficiency is greatly improved, and the cost is reduced. And waste of precious metal resources is effectively reduced.

The invention provides a lead zincate niobate-lead zirconate titanate based perovskite ceramic material and a preparation method thereof, the general formula of the chemical composition of the perovskite ceramic material is (1-x) Pb [(Zn1 / 3Nb2 / 3) 0.3 (Zr1 / 2Ti1 / 2) 0.7] O3-xBi (Zn1 / 2Ti1 / 2) O3, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, 0.015 lt, xlt; 1; a Bi (Zn1 / 2Ti1 / 2) O3 component is introduced into a lead zincate niobate-lead zirconate titanate matrix, local structure distortion is formed in a perovskite structure by utilizing the high polarizability of Bi < 3 + > and the synergistic effect of (Zn1 / 2Ti1 / 2) < 3 + > composite ions, and meanwhile, a long-range ordered perovskite framework is kept; wherein lead zincate niobate-lead zirconate titanate is used as a matrix to provide a high piezoelectric basis, and due to the introduction of Bi (Zn1 / 2Ti1 / 2) O3, a high Curie temperature is kept through a hardness-like effect, so that the material shows more comprehensive and excellent piezoelectric constant and coercive field and excellent wide-temperature piezoelectric thermal stability compared with commercial soft / hard piezoelectric ceramics.

The invention particularly discloses a preparation method and application of a composite ion exchange membrane. The composite ion exchange membrane is prepared from the following components in parts by weight: 95 to 110 parts of perfluorinated sulfonic acid resin, 5 to 8 parts of functionalized multi-walled carbon nanotubes, 10 to 15 parts of phosphotungstic acid, 1 to 1.8 parts of cerium-tannin complex, 12 to 20 parts of polyphenylene sulfide enhanced net, 30 to 40 parts of sulfonated polyether ether ketone solution, 3 to 5 parts of MXene-silicotungstic acid compound and 1 to 3 parts of polyethyleneimine cross-linking agent. The preparation method comprises the following steps: preparing the functionalized multi-walled carbon nanotube and the cerium-tannin complex; blending the perfluorinated sulfonic acid resin and the functional filler to prepare a membrane casting solution, and coating to form a membrane; a PPS reinforced net and an SPEEK solution are subjected to composite reinforcement, the PPS reinforced net and the SPEEK solution are subjected to PEI crosslinking and then superposed with the membrane, an MXene-silicotungstic acid compound is sprayed on the surface, and the composite ion exchange membrane is obtained through hot pressing and acid activation, has high proton conductivity and excellent mechanical strength and chemical stability and can be applied to a proton exchange membrane electrolytic cell and an all-vanadium redox flow battery.

The invention belongs to the technical field of ceramic pigments, and particularly discloses a heat reflection brown ceramic pigment as well as a preparation method and application thereof. The general chemical formula of the heat reflection brown ceramic pigment is Ca < 1-x > (Li, Fe) < x > TiSiO5, and x is greater than or equal to 0.1 and less than or equal to 0.4. On the basis of a stable titanite crystal phase, trivalent coloring ions Fe < 3 + > and monovalent Li < + > are co-doped according to the molar ratio of 1: 1, Ca < 2 + > in the titanite structure is equivalently replaced by composite ions, the brown titanite pigment with a stable structure is formed, on the premise that the high reflectivity of the titanite is kept, effective coloring of the titanite is achieved, and the service life of the titanite pigment is prolonged. The reflectivity of the pigment in the visible-near infrared band can reach 86-90%. Meanwhile, during preparation, a mode of firstly ball-milling and then superfine grinding is adopted, the reaction activity of the raw materials in the refining process is improved by virtue of the mechanochemical action, and the color development and thermal color radiation effects of the pigment are further improved.

The present application belongs to the technical field of pharmaceutical preparation, and relates to an electrolytic silver ion solution capable of completely inactivating HIV and a preparation method thereof. The electrolytic silver ion solution uses ultrapure water as a solvent, and contains divalent silver ions, a complexing agent and a complexing agent in the electrolytic silver ion solution. The complexing agent is hexamethylenetetramine capable of forming a stable complex with silver ions and capable of quantitatively analyzing the concentration of silver ions. The hexamethylenetetramine is of an analytical purity grade. The complexing agent is ethylenediamine capable of forming a more stable silver-ammonia complex ion, i.e., diammine silver, and capable of doubling the concentration of the generated silver-ammonia complex ion. The concentration of the divalent silver ions is 200-300 mg.kg ‑1 -1; the highest concentration of the complexing agent is 0.9 g.kg ‑1 -1; and the highest concentration of the complexing agent is 0.55 g.kg ‑1 The complexing agent and the complexing agent of the present application have a small dosage, a high relative ratio of silver ions and a stronger activity, and the inactivation rate of HIV is as high as 99.993%.

The invention relates to the technical field of biological metallurgy, in particular to an enhanced leaching method of jorusite. The enhanced leaching method of the jorlybdenum ore comprises the following steps: mixing a liquid phase system containing Fe < 2 + > and a bacterial liquid system formed by acidophilic thiobacillus ferrooxidans with nitrite to obtain a mixed system; then mixing with jorlybdenum ore to obtain a first system; adjusting the pH value of the first system by using an acid solution, and then carrying out oscillation treatment; the concentration of the nitrite in the mixed system is 40-60 mmol / L. According to the enhanced leaching method of the jorlybdenum ore, the complex metabolic process of acidophilic thiobacillus ferrooxidans is combined with nitrite enhanced biological leaching, nitric acid generated by metabolism of the acidophilic thiobacillus ferrooxidans provides acid for molybdenum dissolution of the jorlybdenum ore, generated Fe < 3 + > can be subjected to oxidation-reduction reaction with MoS2 to form stable complex ions [MoO4] < 2->, and the stable complex ions [MoO4] < 2-> are subjected to oxidation-reduction reaction with MoS2. The nitric acid can reinforce the dissolution and leaching of Mo from mineral jorlybdenum ore, so that the leaching effect of Mo is improved.

The objective of the present invention is to provide a chemical treatment liquid capable of forming a coating having improved corrosion resistance. The present invention relates to a chemical treatment liquid containing a water-soluble titanium complex ion, a water-soluble vanadium-containing ion, and a fluorine ion, wherein the concentration of the fluorine ion is 1.2 g / L or more.

The invention discloses a zirconium-cerium composite ion modified sodium bismuth titanate-based dielectric energy storage ceramic material and a preparation method thereof, the chemical general formula of the ceramic material is (Bi < 0.5 > Na < 0.5 >) < 0.65 > (Ba < 0.3 > Sr < 0.7 >) < 0.35 > Ti < 1-x > (Zr < 0.8 > Ce < 0.2 >) < x > O < 3 >, and x is greater than or equal to 0.01 and less than or equal to 0.12. The composite ion (Zr0. 8Ce0. 2) < 4 + > is introduced to equivalently replace Ti < 4 + > ions at the B site in (Bi0. 5Na0. 5) 0.65 (Ba0. 3Sr0. 7) 0.35 TiO3, so that the density of crystal grains is effectively improved, the breakdown field strength of the ceramic is remarkably improved, a slender ferroelectric hysteresis loop is obtained, and excellent energy storage performance and dielectric temperature stability are obtained under a low electric field. According to the invention, the difficulty of low energy storage density under a low electric field is broken through, the preparation process is simple and easy to operate, the performance stability is better, and the development requirements of miniaturization and integration of current electronic products are met.

The present invention discloses a method for preparing a polytetrafluoroethylene (PTFE) flexible conductive circuit. The method first utilizes the synergistic effect of the chemical etching effect of a relatively low-concentration sodium naphthalene treatment solution and the etching effect of an ultraviolet pulsed laser to achieve good hydrophilic wetting properties in the laser-etched circuit pattern area, while hydrophobicity is exhibited outside the laser-etched circuit pattern. After laser etching, a metal ion or metal complex ion activation solution is coated on the surface of the PTFE flexible substrate. The activation solution rapidly wets the laser-etched circuit pattern. Finally, the polytetrafluoroethylene (PTFE) flexible conductive circuit is prepared through chemical plating. This method solves the problems in the prior art of preparing PTFE flexible conductive circuits, such as the difficulty in achieving the desired result, the harsh preparation conditions, the complex process steps, and the low industrial application value.

The present application relates to the technical field of catalytic materials, and discloses a halloysite nanotube loaded palladium-platinum bimetallic alloy catalyst and a preparation method thereof, the catalyst comprising heat pretreated halloysite and uniformly dispersed palladium-platinum bimetallic alloy particles, and the mass ratio of palladium, platinum and heat pretreated halloysite being 0.012-0.022:0.012-0.022:1. The preparation method comprises mixing the heat pretreated halloysite with palladium chloride and chloroplatinic acid hexahydrate, adding concentrated ammonia water to adjust the pH to 9-11 to form an ammonia complex; obtaining a precursor through a hydrothermal reaction, and adding sodium borohydride for liquid phase reduction. The bimetallic alloy phase produces geometric and electronic synergistic effects, thereby reducing the reaction activation energy; the ammonia complex ion is chemically bonded with the hydroxyl group of the carrier to prevent the loss of active components in the hydrothermal environment. The catalyst is combined with glycerol to produce hydrogen in situ, thereby avoiding the safety hazards and equipment investment of external high-pressure hydrogenation, and realizing the high-yield conversion of green diesel under extremely low noble metal loading.

This invention provides a scale inhibitor and its preparation method. The scale inhibitor is used for phosphogypsum leachate in a reverse osmosis membrane system. The scale inhibitor comprises the following raw materials in parts by weight: 10%-20% aluminum compound, 5%-10% organophosphonic acid, 2%-5% anionic surfactant, 4%-10% solvent, and the remainder is purified water. This addresses the problem of scaling in phosphogypsum leachate in reverse osmosis membrane systems by existing commercially available scale inhibitors, which suffer from poor targeting and scale inhibition effects. This invention introduces an aluminum compound, in which Al... 3+ It will react with silicon in a competitive manner with fluorine, from SiF6 2‑ Complex ions replace silicon to form acid-soluble AlF₂. x 3‑x Complexing ions cause SiF6 in the phosphogypsum leachate to form complex ions. 2‑ Reduce or inhibit SiF6 2‑ This reduces or inhibits the formation of potassium / sodium fluorosilicate scale.

The invention relates to the technical field of analysis and test technologies and medical methods, and discloses a reagent and a method for molecular structure analysis of an estrogen isomer, which are based on cyclodextrin and are used for molecular structure analysis of an alpha / beta-E2 / E3 isomer. The reagent comprises gamma cyclodextrin (gamma-CD), beta-CD and a mixed aqueous solution of compounds containing different metal ion ligands, the molecular formula of the beta-CD is C42H70O35, the molecular weight of the beta-CD is 1134.98, and the compound containing the metal ions is salt of any metal ion or soluble alkali containing the metal ions. According to the method, an alpha / beta-E2 / E3 sample, CD, a compound containing metal ions, such as monovalent metal or divalent metal ions and the like are simply prepared into a mixed solution, then non-covalent compound ions of alpha / beta-E2 / E3-gamma-CD / beta-CD-containing metal ions are generated by utilizing electrospray ionization, and then the ion mobility spectrometry of the non-covalent compound ions is measured by utilizing an ion mobility spectrometry technology. And different position structure information of alpha / beta-E2 / E3 molecules can be obtained.

The present invention discloses a method for preparing an interface diffusion-resistant accident-resistant Mo / Pt / nano-Cr / Cr multilayer composite coating, comprising the following steps: 1. cleaning and clamping a workpiece; 2. composite ion cleaning of the workpiece surface; 3. preparation of a Mo diffusion-resistant layer; 4. preparation of a Pt diffusion-resistant layer; 5. preparation of a nano-Cr layer; 6. preparation of a Cr coating; 7. preparation of a nano-Cr / Cr multilayer composite coating, and obtaining a Mo / Pt / nano-Cr / Cr multilayer composite coating on the surface of a zirconium alloy cladding. The present invention suppresses the bidirectional diffusion of Zr and Cr by prefabricating a highly chemically inert Mo / Pt layer on the surface of a Zr substrate, thereby ensuring the interface stability of the coating under service conditions, and improving the overall consistency and structural density of the coating through a multilayer composite structure of ion implantation and a Cr deposition layer, thereby obtaining an interface integrated coating, which meets the requirements of the zirconium alloy cladding for the corrosion resistance of the coating under nuclear working conditions.

The invention discloses macroporous composite ion exchange resin, a preparation method, a method for preparing diol by hydrating epoxyalkane and application of the macroporous composite ion exchange resin. The macroporous composite ion exchange resin is provided with a spherical or sphere-like pore channel; the macroporous composite ion exchange resin comprises a macroporous composite resin matrix and a functional group connected to the macroporous composite resin matrix, the general formula of the functional group is-N + R1R2R3X-, R1, R2 and R3 are respectively and independently at least one of C1-10 alkyl or aromatic groups, and X-is an anion or an anion group. The unique pore structure of the macroporous composite ion exchange resin disclosed by the invention is very beneficial to substance diffusion and reaction heat transfer, and shows high activity and stability in a reaction for preparing ethylene glycol by hydration of ethylene oxide at a low water ratio.

The invention belongs to the field of material surface treatment engineering, and provides a micro-arc oxidation method of titanium-based sewage disposal equipment, which comprises the following steps: carrying out micro-arc oxidation treatment by taking copper pyrophosphate complex ions as a copper source, a titanium-based workpiece as an anode and an inert electrode as a cathode, and carrying out micro-arc oxidation treatment by controlling the pH value of electrolyte to be 8.5-8.8, the copper pyrophosphate complex ions stably exist in the electrolyte in the form of ions, and move towards the anode under an external electric field, so that a micro-arc oxidation film layer with high copper doping amount is formed on the surface of the copper pyrophosphate complex ions, and the micro-arc oxidation film layer has good corrosion resistance and antifouling performance. According to the method, the anti-fouling performance of the micro-arc oxidation film layer can be improved, and wide application of the titanium-based component in a blow-off pipeline system is promoted.

The application discloses a temperature response positive charge type nano-fertilizer delivery system, and belongs to the technical field of fertilizers. The delivery system is a regular circular core-shell structure with an average particle size of 80-120 nm, and is formed by encapsulating complex ions formed by humic acid and trivalent iron ions, with a positive polymer (PDMAEMA-b-PCL) as a carrier. The average Zeta potential range of the delivery system is 25-32 mV. The delivery system utilizes a temperature response unit to intelligently regulate and control surface charges. At normal temperature, the high positive charge of the delivery system can be strongly adsorbed on the surface of the negatively charged leaf, so that the deposition uniformity and the anti-scouring property are improved. After deposition, the environmental temperature is increased to trigger the in-situ reduction of the charge, so that the absorption barrier is broken, and the uptake capacity of the leaf for nutrients is optimized. Compared with other nano-fertilizers and commercially available fertilizers, the application has more excellent effects on promoting seed germination and crop growth and development, and crops show good concentration dependence, which proves the efficiency and application safety of the application.

An n-type material for thermoelectric conversion obtained by doping a p-type material for thermoelectric conversion with a dopant, the p-type material for thermoelectric conversion containing a carbon nanotube and a conductive resin, in which the dopant contains a complex ion containing a divalent iron ion, an alkali metal cation, a cation scavenger, and a reducing agent.

The application discloses an antibacterial temperature-regulating fabric and a preparation method thereof. The method comprises the following steps: reacting a silver ion solution with a reducing agent to obtain silver complex ions, and then reacting the silver complex ions with graphene oxide to obtain a nanocomposite AGO; preparing a silica and titanium dioxide suspension, mixing the two uniformly, and then preparing SiO2 / TiO2 by a hydrothermal method; preparing AGO electrospinning liquid by mixing the nanocomposite AGO and polyacrylonitrile, and then spinning a fiber layer on the AGO electrospinning liquid by an electrospinning method to obtain an Ag / GO@PAN layer; preparing SiO2 / TiO2 electrospinning liquid by mixing the SiO2 / TiO2 and polyacrylonitrile, and then spinning a second fiber layer SiO2 / TiO2@PAN on the surface of the Ag / GO@PAN layer by the electrospinning method to obtain an Ag / GO@SiO2 / TiO2@PAN fabric. The fabric prepared by the application realizes two-way temperature regulation of intelligent fabric radiation refrigeration daytime temperature drop and passive radiation heat preservation, and has good antibacterial property.

Compounds of Formula (I) are described, in which: R1 to R6 are each, independently, selected from H, Z1-PEG and Z2-A-Mn+; Z1 and Z2 are each, independently, a linker; A is selected from the group consisting of a carboxylate group, a hydroxymate group, or a hydrazine group (C(O)NH-NH2); Mn+ is a metal ion selected from Zn2+, Sn2+, Cu2+, Cu+, Cd2+, Cr2+, Cr3+, Pt2+, Pt4+, Ni2+ Pb2+, Pd, Ru2+, Rd, Au+, Au3+ Ag+, Mn2+, Hg2+, Co+, Co2+, Co3+ Fe2+, or Fe3+ in which the metal ion is coordinated to one of more ligands to complete its coordination sphere; P+ designates the charge on the complex ion which may be positive, negative, or absent; and B is a counterion; in which one of R1 and R2 is one of Z1-PEG and Z2-A-Mn+ and one of R3, R4, R5, or R6 is another of Z1-PEG and Z2-A-Mn+.

This invention relates to the field of ceramic materials and provides a method for preparing silicon nitride powder, solving the problem of high residual chlorine / oxygen impurities due to the difficulty in removing byproducts during the preparation of silicon nitride in existing technologies. The method includes the following steps: S1, constructing an electrochemical cell: the anode material is a high-purity single-crystal silicon wafer; the cathode material is a graphite plate; the electrolyte is a mixed solvent of liquid ammonia and ethylenediamine with added LiCl electrolyte; S2, electrochemical ammonolysis reaction: under the action of an electric field, the silicon anode is oxidized to generate high-valence silicon-ammonia complex ions; the NH2 released from the liquid ammonia... ‑ The precursor migrates and combines towards the anode to generate a silane precursor containing Si-NH2 bonds; S3, the precursor is purified by washing with liquid ammonia, replacing with organic solvent and drying at low temperature; S4, the precursor is subjected to low-temperature pre-decomposition and high-temperature crystallization treatment under nitrogen protection to obtain high-purity α-Si3N4.

The invention belongs to the technical field of platinum metal recovery and extraction, and provides a method for recovering and extracting platinum from a platinum-containing catalyst of a waste automobile in order to solve the problem that the traditional wet method is poor in platinum selectivity. A to-be-treated waste automobile platinum-containing catalyst is subjected to roasting, alkali treatment, leaching, first extraction, second extraction, reverse extraction, platinum precipitation and reduction treatment to obtain a finished product platinum, an amide imidazole extraction agent is used in the second extraction and is generated by reacting an amide derivative containing a pyridine ring with imidazole cation salt, cations of the amide imidazole extraction agent are combined with negative complex ions of platinum through electrostatic adsorption, and the platinum-containing catalyst is obtained. Negative ion pyridine ring nitrogen atoms and platinum ions form specific coordination, and selective recognition of platinum and rejection of interfering ions are realized through dual effects; meanwhile, the extraction agent improves the acid resistance through amido bonds, is matched with imidazole cations to reduce the cost, cooperates with pre-extraction impurity removal and an anti-emulsification system, enhances the separation capacity, prepares high-purity platinum and improves the recovery efficiency.

The present invention discloses a preparation method and application of a sulfonated polybenzimidazole / benzimidazole-based covalent organic framework composite alkaline ion solvent membrane, belonging to the technical field of energy conversion. In the present invention, sulfonated polybenzimidazole is used as a polymer matrix, and benzimidazole-based covalent organic framework is in-situ synthesized by a thermal-induced solvent evaporation method to prepare a composite alkaline ion solvent membrane with a benzimidazole structural unit as the main body. The sulfonic acid groups on the polymer matrix can interact with amino groups to mediate the positioning to achieve long-range regular and ordered sub-nanometer pores. At the same time, the enrichment of benzimidazole functional groups can improve the hydroxide conductivity of the composite ion solvent membrane. Meanwhile, the in-situ generation of benzimidazole-based covalent organic framework fillers in the membrane can make it have good compatibility and uniformity with the polybenzimidazole matrix, and enhance the mechanical properties of the membrane, having good application prospects in energy conversion fields such as alkaline water electrolysis, zinc-air batteries, carbon dioxide electroreduction, and ammonia fuel cells.

The invention discloses an ammonolysis process of high-yield taurine, and relates to the technical field of ammonolysis of taurine. The ammonia water complexing ion catalyst is added into the reaction liquid, a common ammonolysis process is replaced by a microwave ammonolysis process, the filtrate is subjected to high-temperature spray drying treatment, byproducts are removed, and the filtrate is reused as mother liquor, so that the temperature pressure and the reaction time during ammonolysis are reduced, the reaction conditions are milder, and the yield is higher. Meanwhile, by-products are reduced, the yield of the taurine and the ammonolysis efficiency are comprehensively improved, and the environmental problem caused by the residual by-products is avoided; the aluminum oxide in the ammonia water complexing ion catalyst is high in hardness and strength and stable in chemical property, can effectively resist abrasion and crushing in the catalysis process, prolongs the service life, can be recycled and has certain economic benefits.