202 results about "Divalent metal ions" patented technology

The invention discloses a selective exchange film sealing concentrated solution based on layered double hydroxides. The selective exchange film sealing concentrated solution comprises divalent metal ions, a corrosion inhibitor, a pH buffering agent and a wetting agent. The invention also discloses a preparation method and application of the compound. The closed thin film obtained based on the layered double-metal hydroxide selective exchange thin film closed concentrated solution has excellent compactness, double protection on the aluminum alloy anode oxide film is achieved through selective exchange of interlayer anions of the closed thin film, and the corrosion resistance of the aluminum alloy anode oxide film is improved and enhanced; and on the premise that the aluminum alloy anode oxide film is protected from being corroded, the alkali resistance of the aluminum alloy anode oxide film is improved and enhanced, and the color fixing performance of the dye is achieved.

The invention provides silk fibroin hydrogel containing divalent bioactive metal ions and a preparation method of the silk fibroin hydrogel, and belongs to the technical field of soft and hard tissue repair and medical dressings. The invention provides a silk fibroin hydrogel preparation method, which comprises: S1, dissolving degummed silk by using a dissolving agent to prepare a silk fibroin stock solution; s2, dialyzing the silk fibroin stock solution in water dissolved with divalent metal salt to obtain a silk fibroin composite solution; s3, carrying out heat preservation treatment on the silk fibroin composite solution, then applying shearing force, and incubating to obtain the silk fibroin hydrogel containing the metal ions. The preparation method of the silk fibroin hydrogel is simple, the pH value does not need to be adjusted in the preparation process, a gelatinizing agent does not need to be added, two cross-linking mechanisms of beta-folding cross-linking of a silk fibroin hydrophobic chain segment are promoted under the action of shearing force by chelating and cross-linking a silk fibroin hydrophilic chain segment through divalent metal ions, so that a silk fibroin aqueous solution is rapidly gelatinized, and the silk fibroin hydrogel is prepared. And meanwhile, one or more divalent metal ions can be compounded according to expected purposes, and good operability, biological safety and multifunctionality are achieved.

The invention discloses a multi-network anti-freezing hydrogel electrolyte, a preparation method thereof and application of the multi-network anti-freezing hydrogel electrolyte in an electrochemical device. The hydrogel is prepared by using polyvinyl alcohol (PVA) and polyacrylamide (PAM) to form a basic network skeleton, introducing phytic acid, ethylene glycol and lithium / zinc bimetal salt (Li2SO4 / ZnSO4), and carrying out thermal initiation polymerization and freeze thawing. The hydrogel prepared by the invention has a multiple physical cross-linked network formed by polymer molecular chain entanglement, hydrogen-bond interaction among functional groups and metal coordinate bonds constructed between phosphate groups and divalent metal ions, so that the hydrogel electrolyte has excellent mechanical properties. Due to introduction of ethylene glycol, formation of ice crystals is effectively inhibited, and the hydrogel is endowed with excellent anti-freezing performance; the high-concentration Li < + > and Zn < 2 + > ensure the high ionic conductivity. The supercapacitor assembled by using the hydrogel electrolyte shows relatively high specific capacitance and good capacitance retention rate under bending and freezing conditions, and has good electrochemical properties and safety performance.

The application provides a reverse water gas shift catalyst, a preparation method and application thereof, and the reverse water gas shift catalyst prepared by the preparation method has excellent catalytic activity and high CO selectivity in a reverse water gas shift reaction. The preparation method comprises the following steps: contacting a precipitating salt solution with a precipitant aqueous solution and performing co-precipitation, and simultaneously controlling the reaction temperature to be 40-80 DEG C and the pH to be 6-8; optionally performing aging after the co-precipitation is completed; filtering the obtained precipitate to obtain a filter cake, washing the filter cake, then drying the filter cake, and calcining the filter cake at 300-500 DEG C to obtain the reverse water gas shift catalyst; wherein the precipitating salt solution is a mixed aqueous solution of a soluble salt of divalent metal ions and a soluble salt of trivalent metal ions, the divalent metal ions are selected from divalent ions of Mg and / or Zn, and the trivalent metal ions are selected from trivalent ions of Al, In and / or Ga.

The invention belongs to the field of biological catalysis, and particularly relates to a method for preparing oxidized nicotinamide adenine dinucleotide phosphate through double-enzyme coupling. According to the invention, through construction and optimization of a one-pot double-enzyme coupled catalytic system, a genetically engineered bacterium containing nicotinamide mononucleotide adenosine transferase NMNAT and a genetically engineered bacterium containing NAD kinase are used as a whole-cell catalyst, nicotinamide mononucleotide NMN is used as a starting substrate, adenosine triphosphate, polyphosphate and divalent metal ion salt are added, and the whole-cell enzyme is prepared through a one-pot method. The oxidized nicotinamide adenine dinucleotide phosphate NADP < + > is efficiently and catalytically synthesized by a one-pot method, and the whole-cell catalytic reaction liquid is separated and purified to obtain the NADP < + >. The double-enzyme catalysis method disclosed by the invention is short in reaction route, high in atom economy, capable of reducing the existing production cost, short in production period, easy for downstream separation and purification, and suitable for large-scale and large-scale production of NADP < + >.

The invention discloses a microporous metal organic framework material, a preparation method and a rare gas separation method, and belongs to the technical field of chemical adsorption separation, the microporous metal organic framework material is constructed by coordination of divalent metal ions, heterocyclic dicarboxylic acid ligands and nitrogen-containing heterocyclic ligands; divalent metal ions and heterocyclic dicarboxylic acid ligands are coordinated to form a two-dimensional polymer, and nitrogen-containing heterocyclic ligands serve as pillared bodies and are coordinated with the two-dimensional polymer to form a three-dimensional frame structure. A microporous metal organic framework material is used as an adsorbent and is in contact with a rare gas mixture, so that high-polarity rare gas is recognized and captured, and separation and purification of the rare gas are achieved. According to the invention, by changing different ligands and functional group substituents thereof, precise regulation and control of a pore chemical electrostatic environment are realized, so that selective separation of rare gases such as xenon / krypton, helium / neon and the like is realized.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a compound conditioner for treating sulfate type saline-alkali soil and application of the compound conditioner. The compound conditioner is formed by compounding hydrotalcite, acidic zeolite and humic acid; wherein the hydrotalcite is nitrate intercalated MgAl-LDH or MgFe-LDH, and the molar ratio of divalent metal ions to trivalent metal ions of the hydrotalcite is (2: 1)-(4: 1); the acidic zeolite is clinoptilolite treated by a nitric acid solution; the humic acid is mineral source humic acid, and the purity of the humic acid is greater than 80%. The compound conditioner disclosed by the invention can mineralize Na < + > and SO4 < 2-> which are too high in content in saline-alkali soil, reduce the salt content and pH and prevent plants from osmotic stress and alkaline toxicity; the content of nitrate nitrogen and organic matters in soil is increased, and nutrient substances are provided for plants; the soil structure is improved, the water-retaining property and the air permeability are enhanced, the soil bulk density is reduced, and plant germination and root growth are facilitated.

The invention provides a CuCoNi-MOF aerogel nano-enzyme, a preparation method thereof and a detection reagent, and belongs to the technical field of antibody detection.The preparation method of the aerogel nano-enzyme comprises the following steps that bivalent copper salt, bivalent cobalt salt and bivalent nickel salt are mixed, then a reducing agent is added to reduce bivalent metal ions, then a dimethylimidazole solution is added, and the CuCoNi-MOF aerogel nano-enzyme is obtained. And reacting at 25-35 DEG C for at least 1 hour, finally taking out the precipitate after the reaction, washing with deionized water, and freeze-drying to obtain the target product. The detection reagent provided by the invention is prepared from the aerogel nano-enzyme as a raw material. The aerogel nano enzyme has high activity and strong stability, and can form a detection reagent with stable properties with a protein biomarker, and meanwhile, the preparation method is simple and convenient, and does not need expensive instruments, so that the manufacturing cost can be reduced. The detection reagent provided by the invention has very high sensitivity and accuracy.

The invention discloses a reagent for detecting the activity of isocitrate dehydrogenase. The reagent consists of a first reagent and a second reagent, the first reagent comprises an electron carrier, isocitric acid or isocitrate, divalent metal ions, a first reagent buffer solution, a first reagent additive, a first reagent preservative and a first reagent surfactant; the divalent metal ions comprise metal ions; the second reagent comprises a dye which comprises tetrazolium salt and has an oxidation state and a reduction state, a cofactor, a second reagent buffer solution, a second reagent additive, a coenzyme stabilizer, a second reagent surfactant and a second reagent preservative; the pH is buffered to 7-9.5 and 5-9 by the first buffer solution and the second buffer solution respectively; the first reagent additive and the second reagent additive comprise divalent metal salt, sugar, sugar alcohol, protein, chelating agent and basic amino acid; the first and second reagent surfactants comprise nonionic and anionic surfactants; the first reagent preservative and the second reagent preservative comprise sodium azide or isothiazolinones. The invention further discloses a corresponding detection method.

The invention discloses a modified polyphenyl ether material as well as foamed beads and a foamed molded body thereof, and belongs to the technical field of chemical engineering. The modified polyphenyl ether material comprises the following components: polyphenyl ether, a cross-linking agent containing carbonyl, and a cross-linking auxiliary agent containing divalent metal ions, wherein carbonyl oxygen atoms in the cross-linking agent are connected with metal atoms in the cross-linking auxiliary agent to form a reversible cross-linking structure. According to the present invention, with the reversible cross-linked structure, the modified polyphenyl ether material has good mechanical property at the normal temperature and the temperature lower than the thermal deformation temperature (HDT), and the reversible cross-linked structure is destroyed during the high temperature preparation process so as to significantly improve the flow property and the processing property of the modified polyphenyl ether material; the method has great significance for solving the problems of poor melt fluidity and difficult processing of the polyphenyl ether material, and provides a new thought for improving the foaming performance of the polyphenyl ether foaming material.

The invention belongs to the technical field of extraction of lithium from oilfield brine, and discloses a purification method and system for extraction of lithium from oilfield brine and high-impurity lithium-rich liquid. The purification method comprises the following steps: step 1, adding a sodium hydroxide solution into the high-impurity lithium-rich liquid to adjust the pH value, then adding a sodium carbonate solution, carrying out stirring reaction, and carrying out plate-frame pressure filtration to obtain filter residues and filtrate; step 2, performing ceramic ultrafiltration on the filtrate to obtain produced water and concentrated water, and returning the concentrated water to the step 1 to participate in the stirring reaction again; and step 3, regulating the pH value of the produced water with hydrochloric acid, using the regulated produced water as an adsorption stock solution, and adsorbing and desorbing the adsorption stock solution with an aluminum adsorbent to obtain a purified lithium-rich solution. According to the method, aiming at the situation that a large amount of divalent metal ion impurities such as calcium and manganese are contained in the oil field brine lithium extraction lithium-rich liquid, after preliminary impurity removal is carried out through chemical precipitation, deep impurity removal is carried out in combination with ceramic ultrafiltration and the aluminum adsorbent, the service life of the ceramic ultrafiltration and the aluminum adsorbent can be effectively prolonged, and the recycling of ceramic ultrafiltration concentrated water can also improve the yield of lithium ions.

The invention relates to the field of lithium cobalt oxide precursor materials, and provides a coated aluminum-doped cobaltosic oxide material and a preparation method and application thereof.The coated aluminum-doped cobaltosic oxide material comprises an inner core and a coating layer coating the inner core, the inner core comprises aluminum-doped cobaltosic oxide, the coating layer comprises an oxide containing metal ions, and the metal ions are doped in the coating layer. The metal ions comprise divalent metal ions and metal ions with the valence state larger than or equal to 3. The core of the coated aluminum-doped cobaltosic oxide material provided by the invention is aluminum-doped cobaltosic oxide, so that the capacitance of the positive electrode material is improved; divalent metal ions contained in the coating layer are doped in Li ion sites to play a role similar to supporting columns, and the supporting structure is stable; metal ions with the valence state larger than or equal to 3 are doped in Co ion sites, the lattice distortion relieving effect is achieved, the structural stability can be improved by forming strong combination with lattice oxygen, and the cycle stability of the positive electrode material can be improved through the synergistic effect of divalent metal ions and high-valence metal ions wrapped on the outer layer.

The invention discloses a fluorescent probe for determining the sol crystallinity of hydrotalcite colloid based on pi-pi accumulation regulated fluorescence and a preparation method of the fluorescent probe. According to the invention, an imidazole-anchored naphthalene diamine (IANA) fluorophore with a planar naphthyl motif is used as a fluorescent probe. Wherein an imidazole group has relatively strong binding capacity to transition divalent metal ions, and ordered arrangement of IANA is enhanced after transition metal and imidazole are coordinated, so that face-to-face pi-pi accumulation of a planar naphthyl motif is facilitated, absorption of ultraviolet light is inhibited, and fluorescence quenching is further caused. However, the internal structure orderliness and spatial atom arrangement of materials with different crystallinity degrees are different, so that the arrangement orderliness of IANA is different, the quenching degree of a probe is influenced, and the crystallinity degree can be measured through the quenching degree. According to the method, the sol crystallinity of the hydrotalcite colloid is determined through pi-pi accumulation regulated fluorescence, and a new way is opened up for exploring an alternative scheme of X-ray diffraction.

The invention provides iminodiacetic acid type chelate resin and a preparation method thereof. The structural formula of the iminodiacetic acid type chelating resin is # imgabs 0 #, n ranges from 800 to 2000, the grafting rate of # imgabs 1 # ranges from 50% to 80%, each M is independently an alkali metal element, and R is selected from any one of a single bond, an alkylene group of C1 to C5 or an iminoalkylene group of C1 to C5. The n in the iminodiacetic acid type chelate resin is controlled to be within the range, so that the porosity, the specific surface area and the average pore size of the iminodiacetic acid type chelate resin are favorably optimized, and the adsorption efficiency of the iminodiacetic acid type chelate resin on divalent metal ions is favorably improved. The grafting rate is controlled within the range, so that the adsorption active sites in the iminodiacetic acid type chelating resin can be improved, and the adsorption capacity of the iminodiacetic acid type chelating resin on divalent metal ions can be further improved.

The invention relates to a metal ion regulation-based ayu pectin gel forming method and application thereof. The method comprises using monovalent or divalent metal ions (such as Ca < 2 + >, Mg < 2 + >, Na < + >, K < + > and the like) to regulate the formation of the Ayu pectin gel. The preparation method comprises the following specific preparation steps: firstly, dissolving Aiyu pectin in deionized water, and uniformly stirring to prepare a pectin solution; then adding a required metal ion solution, and regulating and controlling the concentrations of different metal ions, so that the metal ions interact with pectin molecules; and standing the mixed solution at room temperature for a certain time, and inducing to form stable pectin gel. The method has the advantages that crosslinking of pectin molecular chains is regulated and controlled through metal ions, and the mechanical property and the water holding capacity of the gel can be remarkably improved; in addition, extra energy input is not needed, and the preparation process is simple, efficient, environment-friendly and green; the finally formed pectin gel has good thermal stability and structural strength, and is suitable for food, health care products and other fields.

The present application provides methods for producing circular RNAs (circRNAs) from a DNA construct encoding a linear RNA precursor, wherein the linear RNA precursor comprises from the 5′-end to the 3′ end: a 3′ catalytic Group I intron fragment, a 3′ exon sequence, an effector RNA sequence, a 5′ exon sequence, and a 5′ catalytic Group I intron fragment, wherein the method comprises an in vitro single-pot reaction. In some embodiments, the single-pot reaction does not comprise supplementing the reagent composition with GTP, a divalent metal ion such as Mg2+, or DNase I prior to circularization of a linear RNA precursor.

The application provides a solid-state electrolyte, the chemical formula of the solid-state electrolyte is: A(Li (3+x+2y) Zr (2‑x‑2y) M x N y Si2PO 12 )B(Li3La(PO4)2), wherein A+B=1, 0<=x<=0.5, 0.1<=y<=0.3, M is a trivalent metal ion, and N is a divalent metal ion. The application has the beneficial effects that the solid-state electrolyte has high ionic conductivity, and the battery prepared from the solid-state electrolyte has high battery capacity and service life.

The invention discloses a metal-G4DNAzyme nucleic acid framework mediated enzyme immobilization method and an application of the metal-G4DNAzyme nucleic acid framework mediated enzyme immobilization method. The method comprises the following steps: co-incubating an enzyme and a G-quadruplex-containing nucleic acid sequence in a PBS buffer solution, adding divalent metal ions, placing in a centrifuge tube, oscillating, carrying out ultrasonic treatment, centrifuging a supernatant, washing with deionized water, redissolving and precipitating by adopting the PBS buffer solution, co-incubating with hyperchlorheme, centrifuging to remove the supernatant, and washing away redundant hyperchlorheme, thereby obtaining the G-quadruplex-containing nucleic acid sequence. And the metallo-G4DNAzyme nucleic acid framework mediated enzyme is obtained. The problems that an existing functional protein and nucleic acid coupling method is complex in process and harsh in condition, and activity and functions of protein are difficult to retain are solved. Coupling of enzyme and nucleic acid is achieved through biomimetic mineralization, and the formed functional metal nucleic acid framework immobilized enzyme has the dual functions of target recognition and signal amplification and is applied to detection of small molecular targets.

The invention discloses a hydrogel microsphere with a core-shell structure, the hydrogel microsphere comprises a sodium hyaluronate hydrogel core and a sodium alginate shell, and the sodium hyaluronate hydrogel core also comprises a slow release factor and divalent metal ions. The hydrogel microspheres with the sodium hyaluronate hydrogel as the inner core and the alginic acid as the shell can realize accurate targeted blasting in the intestinal tract, and can be adhered to the local part of the intestinal wall to induce benign intestinal flora to treat the inflammatory bowel disease, so that the phenomenon that when the medicine arrives at the intestinal tract, the medicine cannot be damaged is avoided; due to peristalsis of the intestinal tract, the medicine can not be accurately released to a specific position. The mass ratio of sodium hyaluronate to sodium alginate is controlled to be (4-20): 1, and the explosion speed of the microspheres is controlled, so that the release speed and the position accuracy of the medicine are controlled, the problem that the blood concentration of the medicine cannot be effectively controlled due to the fact that the release speed of the medicine is too high or too low is solved, the curative effect of the medicine is improved, and side effects are reduced.

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 invention discloses a squeezing anti-scaling agent as well as a preparation method and application thereof. The squeezing anti-scaling agent comprises the following components in percentage by mass: 20-40% of an anti-scaling agent, 7-25% of a nonionic surfactant solution, 28-50% of a beta-cyclodextrin solution, 2-8% of a metal cation solution and 1-3% of a fluorescent marker. Beta-cyclodextrin is used as a host molecule, a nonionic surfactant is used as a guest molecule, supermolecules are self-assembled to construct hollow microspheres through recognition of the host molecule and the guest molecule under the action of hydrogen bonds, Van der Waals acting force, hydrophobic acting force and the like, and in the self-assembly process, a fluorescence-labeled metal-polymeric anti-scaling agent is wrapped in the hollow microspheres, so that the metal-polymeric anti-scaling agent is prepared. The squeezing anti-scaling agent is slowly dissolved and slowly released to the stratum after being squeezed into the stratum, the adsorption performance of the metal-anti-scaling agent chelate in the stratum is enhanced through active divalent metal ions, the retention performance of the anti-scaling agent in the stratum is improved, meanwhile, the concentration of the anti-scaling agent in produced liquid is monitored in real time through the added fluorescent marker, and the anti-scaling agent can be applied to the stratum. And judging whether the released anti-scaling agent can play an anti-scaling role or not.

The invention discloses a preparation method of a carboxyl-metal ion complexing anti-pollution nanofiltration membrane, and belongs to the scientific and technical field of water treatment. The method mainly comprises the following steps: taking a nanofiltration membrane as a base membrane, soaking the nanofiltration membrane in a polyphenol compound solution, and forming a layer of polyphenol compound on the surface of the nanofiltration membrane; soaking the nano-filtration membrane in an organic solution containing an organic compound, and stirring to obtain the nano-filtration membrane with carboxyl groups on the surface; and soaking the nano-filtration membrane in a water-soluble divalent metal salt solution with a certain concentration to obtain the anti-pollution nano-filtration membrane. The method is simple and easy to implement, mild in reaction and low in cost, the surface of the nanofiltration membrane is modified, divalent metal ions are arranged on the surface of the nanofiltration membrane, the anti-pollution function is achieved through the electrostatic repulsion effect, and the method has wide application value in the field of water treatment.

The invention provides a solid electrolyte, the chemical formula of the solid electrolyte is A (Li (3 + x + 2y) Zr (2-x-2y) MxNySi2PO12) B (Li3La (PO4) 2), A + B = 1, x is greater than or equal to 0 and less than or equal to 0.5, y is greater than or equal to 0.1 and less than or equal to 0.3, M is a trivalent metal ion, and N is a divalent metal ion. The solid electrolyte has the beneficial effects that the solid electrolyte disclosed by the invention has relatively high ionic conductivity; the battery prepared from the solid electrolyte disclosed by the invention has relatively high battery capacity and relatively long service life.

The invention relates to a DNA (deoxyribonucleic acid) ligation buffer solution and application thereof, the DNA ligation buffer solution comprises 5-15 mM of divalent metal ions, 0.5-5 mM of DTT (dithiothreitol), 10-15% of polyethylene glycol, 0.5-5 mM of ATP (adenosine triphosphate) and a Tris-HCl buffer solution, and the pH (potential of hydrogen) value of the Tris-HCl buffer solution is 7-9. The DNA ligation buffer solution can significantly improve the ligation reaction efficiency, and increase ligation products in the ligation reaction and the number of molecules capable of being sequenced during library construction.

The invention discloses a preparation method of a magnesium alloy surface micro-arc oxidation corrosion inhibition coating, which comprises the following steps: placing a magnesium alloy as an anode in a micro-arc oxidation electrolyte, and carrying out constant-current micro-arc oxidation by taking stainless steel as a cathode to form the micro-arc oxidation corrosion inhibition coating on the magnesium alloy surface, the micro-arc oxidation electrolyte comprises 5-30 g / L of sodium hydroxide, 20-50 g / L of sodium metasilicate, 5-10 g / L of sodium carbonate and 1-8 g / L of a micro container, and a solvent is water; the carrier of the microcontainer is mesoporous silica, the inorganic corrosion inhibitor is located on the inner side of a mesoporous channel of the mesoporous silica, and the organic corrosion inhibitor is located on the outer side of the mesoporous channel; and part of the organic corrosion inhibitor and divalent metal ions form an insoluble complex to cover the port of the mesoporous channel. The coating prepared through the method has the self-catalysis dual self-repairing function, the self-repairing problem of local damage of the micro-arc oxidation coating is further solved, and then the corrosion protection performance of the magnesium alloy micro-arc oxidation coating is further improved.

The invention discloses an ion locking fixed cyclodextrin cross-linked polymer functionalized cellulose-based textile material and a preparation method thereof, and the method comprises the following steps: cross-linking hydroxypropyl-beta-cyclodextrin (HP-beta-CD) by using 1, 2, 3, 4-butanetetracarboxylic acid (BTCA) to prepare a cross-linked polymer containing carboxyl / carboxylate groups, and carrying out cross-linking on the cross-linked polymer containing carboxyl / carboxylate groups to prepare the ion locking fixed cyclodextrin cross-linked polymer functionalized cellulose-based textile material. Polyphenols active molecules (such as luteolin) are clathrated and / or loaded; depositing the cross-linked polymer loaded with the active molecules on the surface of a cellulose-based textile base material which is subjected to cationization modification and has quaternary ammonium salt cationic groups on the surface through electrostatic interaction; divalent metal ions (preferably Ca < 2 + >) are further introduced to coordinate with carboxyl / carboxylate groups in the cross-linked polymer to form physical cross-linking points, so that locking and fixation of a functional layer are realized, and the release behavior of active molecules is regulated and controlled. The material has the comprehensive performance of stable fixation, washability, durability, breathability, comfort and maintenance and controllable release mode, and can be applied to application scenes such as skin contact textiles and dressing materials.

The invention relates to a preparation method and application of divalent metal ion chelated protein, which comprises the following steps: A, dissolving divalent metal ion salt and L-lysine in water, heating and stirring to obtain a lysine metal chelated salt solution for later use; b, heating and dispersing protein in water to obtain a protein dispersion liquid; c, adding the lysine metal chelate salt solution into the protein dispersion liquid, adding glutamine transaminase, and performing heat preservation and stirring to obtain a cross-linking reaction liquid; d, continuously heating the cross-linking reaction solution and keeping the temperature to obtain an enzyme inactivation reaction solution; and E, homogenizing the enzyme inactivation reaction liquid to obtain the protein chelated with the divalent metal ions. Amino acid is adopted to chelate divalent metal ions, and the problems that a traditional special medical emulsion product is poor in stability, prone to precipitation and the like due to the fact that insoluble mineral substances are used are solved.

The invention discloses a naphthoquinone-based gas sensitive material, a preparation method and application of the naphthoquinone-based gas sensitive material in an ammonia gas sensor, and belongs to the technical field of gas sensors. The material is composed of divalent metal ions such as copper, nickel and cobalt and a polysubstituted naphthoquinone organic ligand, forms a one-dimensional chain structure, has a high specific surface area, an ordered electron channel and excellent molecular recognition capability, and can detect toxic gases such as ammonia gas at room temperature with high sensitivity. Macroscopic preparation of the material can be realized through solvothermal one-step reaction. Compared with the prior art, the one-dimensional coordination structure and ligand site engineering synergistically improve the carrier transport and molecular recognition capability, can realize continuous, real-time and selective detection of ammonia gas under complex working conditions, and has the advantages of high yield, large-scale preparation and excellent device application prospect.

The invention discloses enhanced shampoo powder based on plant-derived antibacterial factors, which comprises the following components in parts by weight: A, 10-40 parts of plant polysaccharide; b, 5-30 parts of vegetable protein; c, 4-15 parts of natural alkaline ester; d, 2 to 10 parts of natural polyol; e, 1-7 parts of plant organic acid; f, 2 to 20 parts of a plant antibacterial active component; g, 3-6 parts of a food-grade anti-caking agent; h, 1 to 10 parts of divalent metal ions; i, 0.5-2 parts of food coloring; plant polysaccharide and plant protein are matched to form a net-shaped embedding structure, and plant antibacterial active components are uniformly embedded into a multi-layer steady-state structure; buffer substances of natural alkaline lipid, polybasic sugar alcohol and plant organic acid are matched to synergistically form a thermal steady state barrier on the periphery of the net-shaped embedding structure, so that the high-temperature stability of active factors in plant antibacterial active ingredients and the controllable slow release of the storage period are promoted; the technical problem that the plant antibacterial active ingredients are subjected to thermal oncolysis, hydrogenation inactivation or molecular configuration isomerization in the links of mixing granulation and subsequent drying is solved.

This invention discloses a method and system for selective separation of monovalent and divalent ions in an alginate fiber coagulation bath based on electrodialysis, belonging to the field of fiber production and membrane separation technology. The method and system integrate a selective electrodialysis device into a traditional coagulation bath circulation system. Utilizing an ion exchange membrane with monovalent and divalent cation selectivity, sodium ions accumulated in the coagulation bath are selectively migrated and removed under the action of an electric field, while divalent metal ions are efficiently retained, thereby maintaining a stable molar ratio of divalent ions to sodium ions in the coagulation bath within the required process range. Compared to traditional methods, this invention eliminates the need for large-scale replenishment of divalent metal salts or full replacement solution, significantly reducing production costs and resource waste. It achieves online regeneration and continuous circulation of the coagulation bath, significantly improving production stability, fiber quality, and resource utilization efficiency, and is suitable for the green and efficient production of various alginate fibers.