101 results about "Polyoxometalate I" patented technology

The invention provides novel liquid-liquid phase separation microparticles (LLPS MPs) as well as a preparation method and application thereof. The liquid-liquid separation (LLPS) system is micron liquid drops formed by driving under the electrostatic attraction effect of positively charged polyelectrolyte and negatively charged inorganic salt or organic salt in an aqueous solution. Polyoxometallate (POM) is used to stabilize it by electrostatic attraction and precipitate LLPS MPs having a ridge structure. According to the preparation method, [{(B-alpha-PW9O34) Co3 (OH) (H2O) 2 (O3PC (O) (C3H6NH3) PO3)} 2Co] 14-(Co7-POM) with photocatalytic water oxidation activity is selected to deposit micron particles, so that the micron particles have enhanced photocatalytic water oxidation activity, and meanwhile, the micron particles can be recycled through simple and feasible solid-liquid separation.

The invention belongs to the technical field of preparation and application of materials, and particularly discloses a method for coating the surface of polyoxometallate with titanium dioxide and application, and the method comprises the following steps: providing polyoxometallate; according to the method, titanium source injection, inert gas purging, reaction gas injection and inert gas re-purging are used as an ALD cycle, multiple cycles are carried out under the same condition, and the titanium dioxide coating layer is deposited on the surface of polyoxometallate. The obtained titanium dioxide coating layer is compact and uniform, the polyoxometallate and the titanium dioxide coating layer cooperate with each other when the titanium dioxide coating layer is applied to the photocatalytic carbon dioxide reduction reaction, the catalytic activity is remarkably improved, and the defects that existing polyoxometallate is poor in stability, prone to agglomeration and the like are overcome in a targeted mode.

An organic-inorganic composite admixture, its preparation method and its application in a calcined clay-limestone low-carbon cement system. The organic-inorganic composite admixture is prepared by free radical copolymerization of unsaturated carboxylic acid, 2-acrylamido-2-methylpropanesulfonic acid, methacryloylpropyltrimethylammonium chloride or acryloylpropyltrimethylammonium chloride, maleic anhydride grafted β-cyclodextrin, an oxidizing agent and a reducing agent, and then by electrostatic assembly reaction with POM polyoxometalate. In the present invention, a spatial cross-linked double network structure is formed through the characteristics of the β-cyclodextrin and polyoxometalate POM structures, resulting in a large steric hindrance and forming a sufficiently thick adsorption layer, which hinders the competitive adsorption of the clay on the admixture; double adsorption sites are formed through the carboxyl and sulfonic acid groups on the main chain and side chains, further enhancing the dispersion ability of the admixture in the LC 3 system, and finally achieving the characteristics of low dosage, high water reduction rate and excellent slump retention performance.

Complexes of polyoxometalate (POM) cluster anions and metal oxide nanocrystal (NC) cores (POM-NC) with tunable NC surface protonation are disclosed. These protonated POM-NC complexes enable precise control over catalytic properties, enhancing catalytic activity under near-neutral pH conditions while improving stability and solubility across various applications. The protonated POM- metal oxide complexes facilitate the activation of airborne O2 under ambient conditions and the production of reactive oxygen species (ROS), including hydroxyl radicals, superoxide, and peroxides. In certain catalytic processes, these complexes mimic enzymatic functions, such as oxidase, peroxidase, catalase, and superoxide dismutase activity, making them valuable for various biological, therapeutic, chemical and environmental applications such as applications related to oxidative catalysis and ROS scavenging.

The invention relates to the technical field of nano-enzymes, and discloses a copper-based nano-enzyme with laccase and peroxidase double-enzyme activity and preparation and application thereof, and the copper-based nano-enzyme is a nano-material prepared by forming MOF through solvothermal reaction of copper ions and diamino terephthalic acid and then performing electrostatic adsorption on the MOF and polyoxometallate. The copper-based nano enzyme has high-efficiency laccase-like activity and peroxidase-like activity at the same time through the combination and synthesis process of the copper ion cluster and the organic ligand. The invention further discloses a preparation method of the copper-based nano-enzyme, peroxidase activity detection and application of the copper-based nano-enzyme to degradation and determination of dichlorophenol. The copper-based nano-enzyme provided by the invention has high catalytic activity and stability, is low in cost and easy to prepare, and can be applied to biosensing detection of hydrogen peroxide and environmental remediation degradation of organic pollutants such as phenols and dyes.

The invention relates to a rare earth based polyoxometallate, the chemical formula of which is [Ce (H2O) 9] [Cu (H2O) (2, 6-pdca)] 3H [SiW12O40]. 5H2O, and 2, 6-H2pdca = 2, 6-pyridinedicarboxylic acid. The compound belongs to a trigonal system and an R3 space group. Rare-earth-based polyoxometallate with peroxidase activity is combined with a copper-based metal organic framework (CuBTC) to form a rare-earth-based polyacid-loaded metal organic framework composite material with CuBTC as a carrier, and then research on the application aspect of colorimetric detection of H2O2 and ascorbic acid is carried out on the rare-earth-based polyacid-loaded metal organic framework composite material. The composite material not only expands the application range of the rare earth-based polyoxometallate-loaded metal organic framework material, but also shows the application prospect of the rare earth-based polyoxometallate-loaded metal organic framework material in clinical diagnosis and food safety monitoring, thereby providing valuable reference for further application in the future.

This invention discloses a polyoxometalate that catalyzes the Knoevenagel reaction, its preparation method, and its applications. The chemical formula of the polyoxometalate that catalyzes the Knoevenagel reaction is: H3[K(H2O)6][K2(H2O) 10 ]2[Cu(en)2(H2O)2][Cu(en)2(Nb6O 19 Cu(en))2·24H2O, where en = ethylenediamine; the polyoxometalate crystals catalyzing the Knoevenagel reaction belong to the triclinic crystal system with space group P-1; the polyoxometalates catalyzing the Knoevenagel reaction prepared in this invention exhibit excellent heterogeneous catalytic performance in the highly efficient Knoevenagel condensation reaction, showing high yield and high stability under isothermal conditions at a 1:1 substrate ratio and over a wide substrate range. The superior catalytic ability of the polyoxometalates catalyzing the Knoevenagel reaction can be attributed to the presence of dense and effective basic sites on the surface of the heteropolycationic chain, and the increased contact frequency between the organic-inorganic hybrid catalyst and the substrate.

According to the invention, a one-pot synthesis strategy is adopted, a polyoxometallate with high proton conductivity and a pure inorganic three-dimensional frame structure is successfully synthesized by accurately controlling the reaction temperature, the pH value and the proportion of raw materials, and the chemical formula of the polyoxometallate is [H2N (CH3) 2] 8K3Na2H4 [Se4W35Ce2O124 (H2O) 4] Cl. 22H2O; based on the structural characteristics, the proton conductivity is further systematically tested under different temperature and humidity conditions; then, Arrhenius fitting is performed on experimental data, and activation energy of proton migration is calculated, so that a proton conduction mechanism is deeply discussed; the polyoxometallate prepared by the invention is of a pure inorganic three-dimensional frame structure, is completely composed of metal-oxygen bonds, and has important structural innovation significance; in addition, the polyoxometallate has the advantages of high proton conductivity, simple preparation process, good chemical stability and the like, so that the polyoxometallate becomes a solid proton conduction material with great application potential.

The invention discloses a selenium molybdate compound constructed by rigid binary / polybasic carboxylic acid ligands as well as a preparation method and application of the selenium molybdate compound. The molecular formula of the compound is as follows: compound 1, (Me2NH2) 14 [(Se2Mo12O42) 2 {O2CC2H2CO2} 3]. 12H2O; a compound 2 is (Me2NH2) 14 [(Se2Mo12O42) 2 {O2CC4H4CO2} 3]. 9H2O; the compound 3 is (TEAH) 28 [(Se2Mo12O42) 4 {C6H4 (CO2) 3} 4]. 27H2O. The polyoxometallate-based proton conductor constructed by the invention has good thermal stability and structural stability at the same time. The polyoxometallate-based proton conductor can maintain the structural stability through the covalent interaction between the ligand and the polyoxometallate (selenium molybdenum oxygen cluster), can realize rapid transmission of protons under the conditions of medium temperature (100 DEG C) and high humidity (98% RH), and meets the requirements of high-performance proton conductive materials in the solid electrolyte material market.

The present application belongs to the technical field of tire manufacturing, and particularly relates to an antiskid tire and a preparation method thereof. The antiskid performance of the tire is significantly improved by adding cerium-doped polyoxometalate-based layered compounds and nitrogen-sulfur co-modified zirconium-based MXene layered compounds in the tread compound. The cerium-doped polyoxometalate-based layered compounds are prepared by hydrothermal reaction and calcination treatment using disodium hydrogen phosphate, sodium molybdate, cerium nitrate and hexanediamine as raw materials. The nitrogen-sulfur co-modified zirconium-based MXene layered compounds are prepared by etching, peeling and co-calcination with thiourea after synthesizing ceramics using titanium powder, aluminum powder, zirconium powder and carbon powder as raw materials. When preparing the tire, the rubber is first mixed with carbon black, the two modified compounds and the additives to obtain a masterbatch, then the vulcanization system components are added to obtain a final rubber compound, and finally the finished product is obtained through extrusion, lamination and vulcanization molding. The antiskid tire prepared by the present application has excellent grip on wet and icy road surfaces.

The invention belongs to the technical field of tumor treatment, and particularly discloses a pH / GSH dual-response copper silicate-based nano system for synergistic treatment of breast cancer, the pH / GSH dual-response copper silicate-based nano system comprises a CuSiO3 nano carrier and molybdenum-based polyoxometallate, the molybdenum-based polyoxometallate is loaded on the CuSiO3 nano carrier, the loading concentration of the molybdenum-based polyoxometallate is 0.2-1.0 mg / mL, and the loading concentration of the molybdenum-based polyoxometallate is 0.2-1.0 mg / mL. And adding molybdenum-based polyoxometallate into the dispersion liquid of the CuSiO3 nano carrier, stirring at room temperature, and centrifuging to obtain the copper silicate-based nano system modified by the molybdenum-based polyoxometallate. The pH / GSH dual-response copper silicate-based nano system for synergistically treating the breast cancer shows a synergistic effect in the aspects of photothermal therapy and induction of copper death and iron death, effectively inhibits tumor cells and improves the treatment efficiency.

The invention relates to a method for preparing sodium D-isoascorbate. The method comprises the following steps: loading polyoxometalate and polydopamine on silica microspheres to obtain silica microspheres loaded with polyoxometalate; dissolving a 2-keto-D-gluconic acid concentrate with methanol, then adding H2O2 and the silica microspheres loaded with polyoxometalate and heating to carry out an esterification reaction; after completion of the reaction, filtering and separating the silica microspheres loaded with polyoxometalate under a heat preservation condition, cooling, crystallizing, and filtering to obtain 2-keto-D-gluconate; adding 2-keto-D-gluconate to methanol to obtain a methanol solution of 2-keto-D-gluconate, then gradually adding an alcohol solution of a sodium ion donor to carry out a conversion reaction, and after completion of the reaction, filtering, cooling, and centrifuging to obtain the product. The method has high production safety and high product yield.

The invention discloses a method for enhancing plant salt stress resistance based on a polyoxometallate-rhizosphere bacterium composite system. The method comprises the following steps: step 1, preparing a polyoxometallate nanocluster with enzyme-like activity; step 2, carrying out surface modification on the polyoxometallate by adopting polyethyleneimine; step 3, loading the modified polyoxometallate on the surfaces of rhizosphere microorganisms to construct a polyoxometallate-rhizosphere bacterium composite system; 4, applying the composite system to plants under the salt stress condition so as to relieve salt stress and promote plant growth. The method has the advantages that the method for regulating and controlling the salt stress resistance of the plants is simple and convenient to operate and high in practicability; by synergistically exerting the effects of removing active oxygen and promoting growth of rhizosphere microorganisms of the polyoxometallate, oxidative damage induced by salt stress is effectively reduced; the method is good in biocompatibility and suitable for plant growth regulation and control under the salt stress condition.

This invention belongs to the field of catalyst technology, specifically relating to a polyoxometalate-anchored cobalt single-atom catalyst, its preparation method, and its application. The invention uses a polyoxometalate as the anchoring substrate and electronic control unit. First, a cobalt-substituted polyoxometalate precursor is prepared via a coordination reaction, then composited with a ZIF-derived conductive carbon substrate, and finally reduced with hydrogen to obtain the target catalyst. This catalyst effectively inhibits cobalt single-atom aggregation, achieving a cobalt single-atom loading of 3.55 wt%. Under alkaline conditions, it exhibits excellent oxygen reduction catalytic activity, stability, and methanol resistance, with a half-wave potential of 0.826 V. When used in a zinc-air battery, it achieves an open-circuit voltage of 1.48 V and a flow rate of 239.6 mW / cm². 2 With maximum power density and excellent cycle stability, it can replace commercial platinum-carbon catalysts.

The invention relates to a graphene supported catalyst, a preparation method thereof and a method for catalyzing epoxidation of cyclododecatriene. The catalyst prepared by taking graphene and polyoxometallate as raw materials has excellent cyclic macromolecular catalytic activity; when the catalyst is used in the epoxidation reaction of macrocyclic olefin, the raw material conversion rate and the selectivity to a target product can be obviously improved.

The invention discloses a polyacid-hydrogel derived atomic-scale Pt modified Mo2C electrocatalyst for electrocatalytic hydrogen evolution and a preparation method of the polyacid-hydrogel derived atomic-scale Pt modified Mo2C electrocatalyst, and belongs to the technical field of new energy materials. Polyoxometallate is used as a precursor, the polyoxometallate is loaded on the surface of cationic polyvinyl alcohol-chitosan hydrogel modified carbon cloth by using the anion characteristic of the polyoxometallate, and the monodisperse Pt atom-doped Mo2C composite material loaded on the nitrogen-doped carbon surface is obtained through high-temperature heat treatment. The material prepared by the invention has excellent electro-catalytic hydrogen evolution performance, even the activity exceeds that of commercial platinum carbon, and the material has important guiding significance on preparation of an electro-catalytic hydrogen evolution catalyst.

Provided is an Anderson-type polyoxometalate including titanium (Ti) as a heteroatom in the center of the Anderson-type polyoxometalate. A method for preparing an Anderson-type polyoxometalate includes mixing a titanium precursor and a tungsten precursor to prepare a mixture, sealing the mixture in a container and heating to form a hydrothermal synthetic solution, and cooling the hydrothermal synthetic solution and then adding a solute to form an Anderson-type polyoxometalate.

This invention is directed to a method of oxygenating hydrocarbons with molecular oxygen, O2, as oxidant under electrochemical reducing conditions, using polyoxometalate compounds containing copper such as Q10[Cu4(H2O)2(B-α-PW9O34)2] or Q13{[Cu(H2O)]3[(A-α-PW9O34)2(NO3)−]} or solvates thereof as catalysts, wherein Q are each independently selected from alkali metal cations, alkaline earth metal cations, transition metal cations, NH4+, H+ or any combination thereof.

The application provides a kind of dual active site polyacid metal organic framework compound photocatalyst and its preparation method and application, it is related to photocatalyst preparation field.The preparation method includes: Keggin type polyoxometalate, chromium nitrate, terephthalic acid are mixed to obtain mixed solution;The molar ratio of Keggin type polyoxometalate, chromium nitrate, terephthalic acid is (0.01-0.10) : 1: 1;The obtained mixed solution is stirred at room temperature, and then the reaction product is obtained by solvothermal reaction, extraction, to obtain dual active site polyacid metal organic framework compound photocatalyst;Wherein, the molecular formula of the Keggin type polyoxometalate is H4SiW 12‑X Mo X O 40 , X=0-12.The obtained photocatalyst can be used for photocatalytic synthesis of urea with water, nitrogen and carbon dioxide at room temperature and normal pressure, the Keggin type polyoxometalate is H4SiW6Mo6O 40 , and the urea yield can reach 1148 μg·h ‑1 ·g ‑1 cat , and the recycling performance is excellent.

The invention relates to the technical field of composite heterojunction materials, and discloses a metal / semiconductor / polyoxometallate heterojunction micro-nano material, a preparation method and application, the chemical expression of the micro-nano material is A / AxO / Ay (BOz) m (OH) n, and the micro-nano material is of a two-dimensional nanosheet structure. The preparation method comprises the following steps: placing metal A electrodes on two sides of a reaction container, and placing a metal B target material in the center of the reaction container; deionized water is injected into the reaction container and submerges the surface of the metal B target material; carrying out liquid-phase laser corrosion reaction on the metal B target material under the induction of an electric field; and collecting the reacted metal A electrode into a new container, and standing for more than 2 weeks until a two-dimensional nanosheet material is grown on the surface of the metal A electrode, and the two-dimensional nanosheet material is the A / AxO / Ay (BOz) m (OH) n micro-nano material. The method is simple and convenient to operate, and the A / AxO / Ay (BOz) m (OH) n multistage heterojunction nanostructure with excellent water electrolysis performance can be obtained without any complex chemical additive and reaction step.

This application provides an aqueous zinc-ion battery separator, its preparation method, and its application. The separator includes a membrane body and a polyoxometalate present in the membrane body; the membrane body includes nanocellulose and has a cross-linked structure formed by cross-linking nanocellulose through the polyoxometalate. This cross-linked structure exhibits a superionization effect, which can disrupt the hydrogen bond network of water in the electrolyte, thereby weakening the solvation effect of water, significantly increasing the entropy of the electrolyte, inhibiting parasitic reactions and dendrite growth, enhancing the reversibility of zinc ion stripping and deposition, and thus improving the cycle stability of the battery; in addition, the separator with this cross-linked structure has a uniform pore size distribution and good mechanical strength and zinc ion transport performance.

The invention belongs to the field of protein separation and purification materials, and particularly discloses a polyoxometallate composite material and a preparation method and application thereof in protein separation and purification, 2 g of polyoxometallate C8H30N2O21W5Zr is added into 30 mL of deionized water, stirring is performed until the mixture is clear and transparent, 5 mL of a polyethyleneimine PEI solution is slowly dropwise added into the mixture under the stirring condition, stirring is performed under the room temperature condition for 7 h, and the polyoxometallate composite material is obtained. Washing with deionized water for several times, and drying at 60 DEG C for 24 hours to obtain a white solid. Compared with the prior art, the polyoxometallate composite material ZrW5-coated PEI modified by a high polymer material is prepared through electrostatic interaction among molecules and is applied to separation and purification of cytochrome c in pig hearts; results show that ZrW5-coated PEI has selective adsorption performance on cytochrome c under corresponding conditions. The novel method using ZrW5-coated PEI as the adsorbent has been successfully used for selective separation of cytochrome c in pig hearts, and shows great potential in separation and identification of cytochrome c in pig hearts.

The present invention discloses a Pomosomes hollow shell structure and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving a positively charged polymer in an oil phase, and dispersing a polyoxometalate and an inorganic salt in an aqueous phase, wherein the polyoxometalate can form an assembly with the positively charged polymer through electrostatic interaction; the inorganic salt is used to reduce the electrostatic repulsion between polyoxometalates; (2) mixing the oil phase and the aqueous phase and then emulsifying, and standing to obtain an emulsion containing a nanoshell structure. The present invention prepares a stable shell structure by using small-sized nanoparticles as raw materials.

Provided is an Anderson-type polyoxometalate including titanium (Ti) as a heteroatom in the center of the Anderson-type polyoxometalate. A method for preparing an Anderson-type polyoxometalate includes mixing a titanium precursor and a tungsten precursor to prepare a mixture, sealing the mixture in a container and heating to form a hydrothermal synthetic solution, and cooling the hydrothermal synthetic solution and then adding a solute to form an Anderson-type polyoxometalate.

The application provides a preparation method of an ion complex and a supramolecular framework assembly, an artificial solid electrolyte interface phase and a zinc metal anode, and belongs to the field of supramolecular framework assemblies. The ion complex is prepared through ion interaction of a polyoxometalate cluster, coordination of zinc ions and cationic terpyridine and hydrogen bonding of grafted carboxyl groups, so that the three-dimensional SF is constructed in a good crystalline state. The three-dimensional growth of the framework of the ion complex is beneficial to improving the structural stability, while the unique performance is maintained. The ion complex can grow in situ on the zinc surface and further extend laterally to form a defect-free full coverage layer. Through dissolution and post-coordination effect, the 3D SF layer is used as an artificial solid electrolyte interface to improve the performance of the zinc anode. The clusters uniformly distributed in the nanopores of the ion complex form negatively charged nanochannels, which can accelerate the transfer of zinc ions and make the zinc deposition uniform.

The invention discloses an ethylene-vinyl alcohol copolymer composite material as well as a preparation method and application thereof. The ethylene-vinyl alcohol copolymer composite material comprises an ethylene-vinyl alcohol copolymer and a polyoxometallate molecular cluster, and the preparation method of the ethylene-vinyl alcohol copolymer composite material comprises the following steps: dispersing the ethylene-vinyl alcohol copolymer and the polyoxometallate molecular cluster in a solvent to prepare a membrane casting solution, and then coating the membrane casting solution on a substrate to form a membrane, and drying to obtain the ethylene-vinyl alcohol copolymer composite material. The ethylene-vinyl alcohol copolymer composite material has the advantages of good gas barrier property, excellent mechanical property, good processability and the like, is suitable for being used as a packaging material in the fields of food, medicine and the like, and is simple in preparation method, low in production cost and suitable for large-scale industrial production and application.

The application provides a kind of functional polyoxovanadate compound, preparation method and its application in catalyzing 5-hydroxymethylfurfural oxidation, belong to polyoxometalate and catalysis chemistry technical field.The functional polyoxovanadate compound can be represented by chemical formula V6O6(OR)4L6(C6H5XO3)4;Wherein, the oxidation number of V is +4, R is selected from methyl, ethyl or propyl, L is selected from imidazole or homologues of imidazole, X is selected from P or As.The functional polyoxovanadate compound structure is novel, preparation method is simple, and can catalyze the reaction of oxygen oxidation 5-hydroxymethylfurfural to prepare 2,5-furandicarboxaldehyde, the conversion rate of catalytic oxidation is high, the selectivity is good, the reaction condition is mild, the catalyst can be recycled and utilized for many times, and the application of such catalyst in biomass conversion is laid.

The application discloses a Standberg type polyoxometalate-based organic-inorganic compound for catalytic oxidative desulfurization, a synthesis method and application, and has a molecular formula of [Zn(H2datrz)2(P2Mo5O 23 )(H2O)2]·11H2O.The synthesis method comprises the following steps: in step one, zinc acetate, 3,5-diamino-1,2,4-triazole, sodium molybdate and deionized water are mixed to be homogeneous; the molar ratio of zinc acetate to deionized water is 1:173, the molar ratio of 3,5-diamino-1,2,4-triazole to sodium molybdate is 1:1, and the molar ratio of 3,5-diamino-1,2,4-triazole to zinc acetate is 4:3; in step two, the pH value is adjusted to 2.5-3, and after stirring, heating and hot filtration are carried out; and in step three, the filtrate is placed at room temperature for one week to obtain the product.The application has the characteristics of low cost, high yield and high catalytic efficiency.

The present application relates to a kind of trispyridine ruthenium and polyoxometalate composite material, preparation method, application and sensor.The trispyridine ruthenium and polyoxometalate composite material includes polyoxometalate, and the polyoxometalate is loaded with trispyridine ruthenium.The present application also provides a kind of preparation method of composite material.The present application also provides a kind of application as electrochemiluminescence material as described in the present application composite material.The present application also provides a kind of sensor, including the composite material described in the present application.The present application solves the problem of low luminescence stability of existing trispyridine ruthenium as electrochemiluminescence reagent.

The invention belongs to the technical field of preparation of polyoxometallate materials, and discloses a polyoxometallate nano-catalyst constructed by a trinuclear ruthenium cluster and application of the polyoxometallate nano-catalyst. The preparation method of the catalyst comprises the following steps: adding Keggin type polyacid, ruthenium trichloride and a 1, 2, 4-triazole ligand into a buffer solution, and inducing coordination of the polyacid, ruthenium and 1, 2, 4-triazole to perform self-assembly under a hydrothermal condition by precisely regulating and controlling the pH value of the solution so as to form a trinuclear ruthenium cluster active center. The catalyst provided by the invention can be applied to a reaction process for preparing urea through electro-catalysis C-N coupling, and has high yield and high selectivity.