152 results about "Carboxylation" patented technology

The invention belongs to the technical field of tumor treatment, and particularly relates to a metal polyphenol network coated drug-loaded mesoporous organic silicon nanoparticle and a preparation method and application thereof.The mesoporous organic silicon nanoparticle (MON) is prepared through a micelle / precursor co-template assembly method, then amination modification, carboxylation modification and drug co-loading are further conducted on the mesoporous organic silicon nanoparticle (MON), and the metal polyphenol network coated drug-loaded mesoporous organic silicon nanoparticle is obtained. The DQMCTH nano-particles are prepared through the steps that DQMCTH nano-particles are taken as a raw material, a copper salt solution and a tannic acid (TA) solution are added and mixed, then a coordination complexation reaction is conducted, hyaluronic acid (HA) is added for modification, and the DQMCTH nano-particles obtained through the method are in a sphere-like shape, regular in shape, uniform in distribution and free of obvious dendritic branches and central radial pore channels. The polypeptide is effectively protected by MPN and is subjected to HA targeted modification; more importantly, the DQMCTH nanoparticles prepared by the method disclosed by the invention show pH / GSH / HAase triple sensitive drug release, and cell and animal experiment results show that the DQMCTH nanoparticles prepared by the method disclosed by the invention have relatively high anti-tumor activity on a drug-resistant breast cancer model.

The application discloses a method for synthesizing nitrogen-containing heteroarene carboxylic acid compounds based on nitrogen-containing heteroarene carbon-hydrogen bond carboxylation reaction and belongs to the technical field of organic synthesis, and specifically comprises the following steps: adding a reaction substrate, an organic catalyst, a base and an additive into a reaction container, then adding a solvent under a CO2 atmosphere, and stirring and reacting at room temperature or under heating in a light irradiation condition; and performing post-treatment on a reaction product, separating and purifying the reaction product, and obtaining nitrogen-containing heteroarene carboxylic acid compounds and derivatives thereof. The scheme has the characteristics of mild reaction condition, wide reaction substrate range, good yield and good regioselectivity, and cheap and easily-obtained raw materials, can efficiently realize nitrogen-containing heteroarene carbon-hydrogen bond carboxylation reaction, synthesize important nitrogen-containing heteroarene carboxylic acid compounds, and has a good application prospect.

The application discloses a lateral test strip for detecting C-reactive protein and application thereof, and the test strip comprises a bottom plate and a sample pad, a combination pad, a nitrocellulose membrane and a water absorption paper which are sequentially stacked on the bottom plate; the combination pad is loaded with AIE fluorescent microspheres; the AIE fluorescent microspheres are composed of P(St-MMA) microspheres coated with AIE materials after hydrolysis and carboxylation; and anti-C-reactive protein antibodies are connected to the AIE fluorescent microspheres through a covalent bond. The surface coating amount of the AIE fluorescent microspheres is increased by 1.6-2.3 times, and the fluorescence intensity per unit mass is increased by about 40-60%. The increase of the coating amount makes the density of the light-emitting core higher, the overall quantum yield is significantly improved, and the uniformity of the fluorescence signal and the detection sensitivity are enhanced. The characteristics are particularly prominent in the detection of CRP protein in the chromatographic test strip, and the detection limit can be effectively reduced, the T / C signal ratio can be improved, and the reaction time can be shortened.

The application belongs to the technical field of food quality monitoring, and particularly relates to a ferric magnetic solid-phase masking agent and a quantitative detection method for lead in vegetable products. The ferric magnetic solid-phase masking agent is prepared by the following method: S1, performing carboxylation on the terminal amino group of DFO to obtain DFO-COOH; S2, coating a SiO2 layer on the surface of Fe3O4 magnetic core to obtain Fe3O4@SiO2; S3, modifying the Fe3O4@SiO2 by amination to obtain Fe3O4@SiO2-NH2; and S4, coupling Ac-DFO with Fe3O4@SiO2-NH2 to obtain Fe3O4@SiO2-DFO. The three hydroxamic acid groups of DFO are combined with Fe 3+ to form a stable chelate, and Fe 3+ can be removed through magnetic separation, the removal rate is increased to more than 99%, and the quantitative detection of lead ions is further faster and more accurate in combination with mature immunochromatography technology.

The invention relates to a preparation method of a PtGaGe alloy-loaded oxygen-doped carbon nanotube and application of the PtGaGe alloy-loaded oxygen-doped carbon nanotube in electro-catalytic oxygen reduction.The preparation method comprises the steps that firstly, the oxygen-doped carbon nanotube is prepared through a carboxylation method, and then platinum nitrate tetraammine, gallium nitrate and ammonium hexafluorogermanate are evenly mixed; the preparation method comprises the following steps: adding a PtGaGe alloy into an aqueous solution of an oxygen-doped carbon nanotube while continuously stirring, uniformly stirring at room temperature, freeze-drying, and roasting in a tubular furnace to finally realize successful loading of the PtGaGe alloy, thereby obtaining PtGaGe / OCNTs. As a novel preparation method, the trimetal alloy can be successfully prepared under the low-temperature condition, and the preparation method has the advantages of being simple in preparation process, mild in reaction condition, controllable in alloy variety and content and the like. According to the invention, the unique double p-d orbital hybridization characteristic in the ternary PtGaGe alloy is utilized, the electron structure of platinum is cooperatively regulated and controlled, the atom utilization rate and the catalytic efficiency of the ternary PtGaGe alloy are simultaneously improved, and the tradeoff relationship between activity and selectivity is successfully broken through.

The invention relates to the technical field of flame retardance of artificial boards, and discloses a method for preparing a high-flame-retardance-smoke suppression type light medium density fiberboard based on a metal ion complexing technology. The method comprises the following steps: firstly, carrying out swelling pretreatment on a wood fiber raw material by using an alkali-urea mixed solution, and then carrying out carboxylation modification to introduce a carboxyl functional group; then carrying out condensation polymerization on the carboxyl and an amine compound; anchoring metal ions on the surface of the fiber through a complexation reaction between an amine compound and metal ions such as aluminum, magnesium and calcium; and finally, carrying out heat treatment to convert metal ions into a nano metal oxide / hydroxide flame retardant in situ, and carrying out sizing, paving and hot press molding to obtain the medium density fiberboard. Through a chemical anchoring strategy of carboxylation-polycondensation-complexation-in-situ generation, molecular-level uniform dispersion and firm fixation of a flame retardant in wood fibers are realized, and the prepared board not only shows excellent flame-retardant and smoke-suppression performance, but also has enhanced mechanical properties, and has the characteristics of environmental protection and high efficiency.

A layered double hydroxide (LDH) in a heterogeneous electrocatalytic sp 2 Application of C–H activation and CO2 carboxylation. The preparation method of a cobalt-iron molybdate intercalated hydrotalcite (CoFe-Mo LDH) catalyst is as follows: the CoFe-Mo LDH is prepared by a simple coprecipitation method. The CoFe-Mo LDH is used for a heterogeneous electrocatalytic sp 2 C–H activation and CO2 carboxylation. By changing the CoFe-Mo LDH intercalation of the CoFe-Mo LDH solvent environment, a series of mono-carboxylation and di-carboxylation products can be obtained, such as: in the case of benzene as a substrate and DMF as a solvent, a mono-carboxylation product benzoic acid is obtained; in the case of benzene as a substrate and MeCN as a solvent, a di-carboxylation product isophthalic acid is obtained. For the first time, the on-demand switching of the mono-carboxylation and di-carboxylation of phenyl substrates is realized, and this research not only provides a new heterogeneous electrocatalytic strategy to achieve the carbon neutralization target, but also successfully converts cheap and easily available chemicals into high-value and carbon chain growth carboxylic acids under mild conditions.

This invention relates to the field of polyaryletherketone (PAEK) material modification technology, specifically to an ultra-low temperature resistant PAEK composite material and its preparation method, comprising the following materials: PAEK resin, polyethersulfone resin, aramid fibers with surface carboxylation pretreatment, sheet-like thermally conductive filler with a thermal conductivity of at least 400 W / m·K, and a coupling agent; this invention, through the synergistic blending modification of sheet-like thermally conductive filler with polyethersulfone (PES) microspheres and aramid fibers, achieves the advantages of high strength, high toughness, and low thermal stress in the composite material under extreme low temperature environments.

This invention discloses a natural polysaccharide-based multilayer composite encapsulated probiotic and its preparation method, relating to the field of functional food and microbial preparation technology. This invention provides metabolic substrates for the probiotics through a probiotic-prebiotic co-encapsulation core located in the innermost layer, enabling them to maintain physiological activity during encapsulation. The first anionic polysaccharide encapsulation layer uses sodium alginate, which forms a three-dimensional gel network in a calcium-ion-containing curing solution. In the acidic environment of the stomach, the carboxyl groups in the calcium alginate gel undergo carboxylation, and the network shrinks and densifies, effectively blocking the invasion of hydrogen ions and pepsin, thus physically isolating the probiotics from gastric juice. When the encapsulated probiotics enter the small intestine and colon, the chitosan in the second pH-responsive composite encapsulation layer undergoes a conformational change due to amino deprotonation. Simultaneously, phosphate and citrate ions in the outer environment exchange ions with calcium alginate, achieving a triggered release of the probiotics in the colon.

This invention provides a carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst, its preparation method, and its application, belonging to the field of photocatalytic materials technology. First, a carbon nitride precursor and a carboxylating agent are mixed in a solvent to undergo a carboxylation reaction, yielding carboxylated graphitic carbon nitride. Then, the carboxylated graphitic carbon nitride is mixed with a copper salt solution for a preliminary reaction, yielding copper-supported C3N4-C powder. Finally, the copper-supported C3N4-C powder and 1,3,5-pyromellitic acid are dispersed in a solvent for a hydrothermal reaction to obtain the carboxyl-functionalized g-C3N4-supported Cu-MOF catalyst. This invention, through directional assembly and growth, ultimately obtains a composite photocatalyst with tight interfacial bonding, stable structure, and high photogenerated charge separation efficiency.

This invention provides a CNT / W 18 O 49 Cu nanofiber sea urchin material and its SERS-photocatalytic bifunctional application, wherein the material is internally embedded with carboxylated CNTs, and W 18 O 49 The nanostructures intertwine to form a three-dimensional network, and the surface of the nano-sea urchin material is composed of high-density radial nanoneedles with Cu at the tips. 2+ Anchored in an atomically dispersed form. This is achieved through carboxylation of CNTs with W... 18 O 49 Nanoneedles intertwine to form a three-dimensional network, creating a radial nanoneedle structure on the surface, with atomically dispersed Cu atoms anchored at the needle tips. 2+ It combines high-sensitivity SERS detection with efficient photocatalytic degradation, enabling integrated "detection-degradation" treatment of organic pollutants.

The invention discloses a self-lubricating PEEK-based composite material and a preparation method thereof, and belongs to the technical field of PEEK composite materials. The self-lubricating PEEK-based composite material is prepared from the following raw materials in parts by mass: 100 parts of polyether-ether-ketone resin, 10 to 15 parts of polyarylene sulfide ketone, 5 to 10 parts of polyarylene sulfide amide, 15 to 25 parts of epoxy group modified MoS2atCO-SiO2 nano material, 4 to 12 parts of modified carbon fiber and 1 to 2 parts of antioxidant. Wherein the modified carbon fiber is obtained by carrying out acylation reaction on carboxylated carbon fiber and then carrying out grafting reaction on the carboxylated carbon fiber and 2-aminodiphenyl sulfide. According to the invention, polyether-ether-ketone, polyarylene sulfide ketone and polyarylene sulfide amide are blended to form a polymer matrix of the PEEK-based composite material, and the epoxy group modified MoS2atCO-SiO2 nano material and the modified carbon fiber are used as lubricating components, so that the composite material has an excellent self-lubricating effect under the combined action.

The preparation of high-value-added aromatic carboxylic acids via CO2 carboxylation coupling through activation of the benzyl C-H bond in alcohols / amines is a green and sustainable pathway to achieve CO2 resource utilization and contribute to carbon neutrality. However, this field currently faces challenges such as poor catalyst selectivity, low CO2 activation efficiency, and a narrow substrate applicability range, making it difficult to meet practical application needs. To address this issue, this patent discovers that in a heterogeneous electrocatalytic system, cuprous selenide (V2), rich in selenium vacancies, can be used... Se -Cu 2‑x Using Se as the core catalyst, it can not only efficiently promote the synergistic activation of benzyl C-H bonds and CO2 carboxylation, significantly improving the overall catalytic activity of the reaction, but also achieve precise chemoselective carboxylation control for different types of substrates. Specifically, this V Se -Cu 2‑x Se electrocatalysts can efficiently and selectively activate the benzyl C-H bond in alcohols and subsequently induce CO2 carboxylation, exhibiting excellent chemoselectivity in the conversion of benzyl alcohol to mandelic acid and its derivatives. Simultaneously, they also demonstrate excellent catalytic performance for amines, selectively catalyzing the carboxylation of amine substrates such as benzylamine with CO2 to directionally generate phenylglycine and aromatic amine-derived carboxylates. Crucially, in addition to typical benzyl alcohol and benzylamine, the substrate applicability of this catalytic system can be extended to various alcohols and amine derivatives, realizing the carboxylation transformation from simple model substrates to diverse functional molecules, providing a new approach for the large-scale preparation of high-value-added aromatic carboxylates.

The application provides a microplastic treatment method in soil, and belongs to the technical field of microplastic treatment. The treatment method is as follows: raw biochar is prepared from agricultural straw, and then is modified by hydroxylation, magnetism and carboxylation; the obtained carboxylated biochar is double-coated by chitosan, acetic acid and sodium alginate; then the obtained double-modified biochar is activated, and a covalently immobilized composite targeting enzyme agent is fixed; the surface of the obtained covalently immobilized enzyme agent is loaded with a bacterial agent suspension by atomization spraying, and is adsorbed after standing; finally, the obtained microplastic treatment agent is applied to soil in the process of plant planting for microplastic treatment. The treatment method does not need to use harmful substances such as chemical oxidants, strong acids and strong bases, has no negative effect on soil animals and microbial communities, realizes source control, in-situ repair and long-term control of microplastic pollution, and provides stable ecological guarantee for sustainable planting of facility cucumbers.

The invention provides three-dimensional interconnected porous skeleton structure carbon aerogel as well as a preparation method and application thereof, and belongs to the technical field of electrode materials. The green deep eutectic solvent is used for cellulose modification, and efficient carboxylation can be realized under the condition that a crystal structure is not damaged, so that the dispersity and the compatibility with conductive components are improved. The MOF template is used as a sacrificial template, a porous structure is formed through induction in carbonization, and the conductivity of the material is improved through the metal center effect; a three-dimensional network is constructed by using a gelatinizing agent, so that the gel strength is improved, and the aerogel skeleton forming is ensured. According to the method, the carbon aerogel is prepared by combining carboxylation of the deep eutectic solvent, doping of the natural polymer gelatinizing agent and regulation and control of the MOF soft template, and the structure of the carbon aerogel and the electrochemical performance of the carbon aerogel in a three-electrode system are remarkably improved by utilizing the synergistic effect of the three components.

The invention discloses a preparation and detection method of a bisphenol A electrochemical sensor based on a carbon nanosphere composite material, and belongs to the technical field of functional nano composite materials and sensing. The preparation method comprises the following steps: synthesizing carbon nanospheres by a hydrothermal method, carboxylating the carbon nanospheres, performing ultrasonic treatment in a hexadecyl trimethyl ammonium bromide solution, performing electrostatic interaction to obtain a carbon nanosphere / hexadecyl trimethyl ammonium bromide compound, and dispensing compound dispersion liquid on the surface of an electrode to obtain the bisphenol A electrochemical sensor. According to the present invention, the high-conductivity carbon nanospheres, the carboxylation effect for improving the dispersibility and providing more electrochemical sites, and the hexadecyl trimethyl ammonium bromide with the strong adsorption effect are integrated, and the constructed bisphenol A electrochemical sensor has the low detection limit (0.8 nM); the electrochemical sensor constructed by the invention has the advantages of higher detection speed, wider detection range and better reproducibility, and is successfully applied to bisphenol A detection in an actual sample.

The invention belongs to the technical field of metal organic framework materials, and provides an Ag-based organic framework material and a preparation method and application thereof.The specific preparation method comprises the steps that silver-based cyclic trinuclear pyrazole aldehyde, 2, 4, 6-tris (4-aminophenyl)-1, 3, 5-triazine and 1H-pyrazole-4-formaldehyde serve as building monomers, benzyl alcohol and 1, 2-dichlorobenzene serve as solvents, and the Ag-based organic framework material is prepared through a hydrothermal method; the preparation method comprises the following steps of: mixing the raw materials with trifluoroacetic acid as a catalyst, freezing, degassing and sealing the obtained mixture, heating to room temperature, uniformly mixing and dispersing, and heating the obtained mixture at 60-70 DEG C to react for 6-10 hours; and after the reaction is finished, carrying out post-treatment to obtain the Ag-based organic framework material. The Ag-based organic framework material is used as a catalyst for synthesis of propiolic acid compounds through a CO2 carboxylation reaction and shows excellent catalytic activity, and the catalyst is high in structural stability, easy to recycle and capable of being recycled and has a wide development prospect.

The application provides a DNA virus tracer coated with a protein by an EDC covalent coupling method and a preparation method and application thereof. The DNA virus tracer coated with the protein of the application is composed of a core, a shell and a protein shell coated on the shell; the core is a SiO2 nanosphere with adsorbed nucleic acid on the surface, a layer of SiO2 shell is coated on the outside of the core, the surface of the shell is modified by carboxylation, and the shell is formed by covalently coupling the protein through EDC. The novel DNA virus tracer provided by the application can effectively protect the coding DNA, facilitate subsequent quantitative detection and analysis, effectively ensure that the outermost shell of the tracer is completely composed of the selected protein, and make the surface characteristics and migration characteristics of the tracer closer to the target virus.

The embodiment of the invention provides a preparation method of a wave-absorbing and heat-dissipating film and the wave-absorbing and heat-dissipating film. The preparation method comprises the following steps: carrying out amination modification on Ti < 3 > C < 2 > T < x > powder to obtain NH < 2 >-Ti < 3 > C < 2 > T < x > powder; the preparation method comprises the following steps: carrying out carboxylation modification on the Fe3O4 nano particles to obtain the Fe3O4-COOH particles. And mixing the NH2-Ti3C2Tx powder with the Fe3O4-COOH particles, and carrying out an amidation condensation reaction, so as to obtain the Ti3C2Tx-Fe3O4 complex. The preparation method comprises the following steps: dissolving polyvinyl butyral in ethanol, and stirring and mixing to obtain a precursor solution; adding the Ti3C2Tx-Fe3O4 complex and hexagonal boron nitride powder into the precursor solution, and stirring and dispersing to obtain a composite glue solution; and coating a substrate with the composite glue solution, drying, curing, and stripping from the substrate to obtain the wave-absorbing and heat-dissipating film. Multiple interfaces exist between Ti3C2Tx-Fe3O4 and h-BN, electromagnetic waves are reflected and scattered for multiple times between the interfaces with different dielectric constants, and the electromagnetic waves are fully lost. H-BN cooperates with Ti3C2Tx-Fe3O4 to jointly form a stable heat conduction channel, so that heat is rapidly conducted to the surface of the wave-absorbing heat dissipation film from a heat source and dissipated, and the situation of local overheating is reduced.

The application provides an imidazole-phosphoramidite bidentate ligand, a synthesis method thereof, a metal catalyst prepared from the imidazole-phosphoramidite bidentate ligand and application of the metal catalyst, and relates to the technical field of catalyst preparation.The imidazole-phosphoramidite bidentate ligand developed by the application has stable chemical properties and is not easy to be oxidized, and solves the problems of poor stability of an imidazole-based bidentate ligand, harsh use and storage conditions in the prior art, and the synthesis method is simple, and the total yield can reach 59%; the imidazole-phosphoramidite bidentate ligand has strong coordination ability, the metal nickel catalyst prepared from the imidazole-phosphoramidite bidentate ligand has high catalytic activity, and in a carbon dioxide carboxylation reaction, the metal nickel catalyst exhibits excellent reaction activity, and is a ligand with very good industrial application prospect.

The invention belongs to the technical field of oilfield exploitation, and particularly relates to a foam stabilizer based on enteromorpha graded modification and a preparation method and application thereof. The foam stabilizer comprises a foam stabilizer or a chelating foam stabilizer. The preparation method of the foam stabilizer comprises the following steps: step 1, enteromorpha pretreatment: taking enteromorpha, cleaning, drying and crushing; step 2, hot water extraction separation: adding deionized water according to a solid-to-liquid ratio of 1: (25-35), stirring and extracting at 85-95 DEG C for 4 hours, and filtering to obtain filtrate and filter residues; step 3, preparation of a foam stabilizer or a chelating foam stabilizer: drying the filter residues at 80 DEG C for 24 hours, and sieving with a 200-mesh sieve to obtain the foam stabilizer; and carrying out alkali activation on the foam stabilizer and then carrying out carboxylation reaction to obtain the chelating foam stabilizer. The foam stabilizer is prepared by graded modification of enteromorpha wastes, so that high-value utilization of the wastes is realized, the foam stabilizer has the advantages of mild process, low cost and excellent foam stability at high temperature and high salt, and the defects in the prior art are effectively overcome.

The application belongs to the technical field of cosmetics, and particularly relates to an oat whole-component extract, an extraction process thereof, application of the oat whole-component extract in multifunctional cosmetics, and Pickering emulsion. The extraction process comprises the following steps: first, performing subcritical extraction on oat kernel fine powder to obtain oat oil and residues; second, mixing the residues with a buffer solution, performing ultrasonic-microwave assisted extraction, filtering, collecting an extract and filter residues; third, performing carboxylation reaction of the extract with CO2, then performing reaction with 3-diethylaminopropylamine, and finally performing reaction with hexanol to obtain oat alkaloids; and finally, performing extraction of the filter residues in water, and performing enzymatic hydrolysis using cellulase to obtain oat beta-glucan. The extraction process is green and environmentally friendly, and solves the problems of single component, high solvent residue and high energy consumption in the prior art. The extract exhibits significant multifunctional synergistic effect in cosmetics, and has industrialization potential.

The invention belongs to the technical field of petrochemical engineering, and relates to a modified double-metal cyanide catalyst, and application and a method of the modified double-metal cyanide catalyst in preparation of a narrow-distribution alkyl polyether extensive surfactant. The method comprises the following specific steps: (1) preparing a modified double metal cyanide catalyst; (2) preparing an aliphatic alkyl polyoxypropylene ether polyoxyethylene ether block copolymer; and (3) carrying out sulfonation, phosphorylation or carboxylation on the synthesized aliphatic polyether block copolymer to obtain the extensive surfactant containing the hydrophilic head group. The preparation process is simple, the raw materials are cheap, the activity is high, the dosage is low, the polyether block copolymer obtained through the catalyst has the advantage of narrow molecular weight distribution, the synthesized surfactant has the characteristics of an anionic-nonionic surfactant, an interface formed by the surfactant and crude oil can easily achieve ultralow interfacial tension, and the surfactant has good application prospects. The construction of a middle-phase microemulsion oil displacement system is realized, so that the recovery efficiency is greatly improved.

The invention belongs to the technical field of biological materials, and particularly discloses a construction method of an anti-protein adsorption and antithrombotic graphene oxide coating, which comprises the following steps: step 1, carboxylating graphene oxide to obtain carboxylated graphene oxide nanoparticles; step 2, grafting heparin to the carboxylated graphene oxide nanoparticles; step 3, the graphene oxide-heparin nanoparticles are combined with polyethylene glycol, and graphene oxide-heparin-polyethylene glycol nanoparticles are obtained; and step 4, combining the graphene oxide-heparin-polyethylene glycol nanoparticles with a biological material. The preparation method has the advantages that the biocompatibility of the medical cardiovascular biological material is improved, the protein adsorption resistance and the thrombus resistance of the medical cardiovascular biological material are improved, and the in-vivo stability of the biological material is improved.

The invention discloses a preparation method of a heterojunction modified C60 supported monatomic iodine catalyst, and belongs to the technical field of nano materials and catalysis. According to the method, iodine atoms are stably loaded on a C60 carrier through oxidation pretreatment, heterostructure construction and a pyrolysis anchoring process. The method comprises the following steps: firstly, carrying out surface carboxylation activation on C60 by adopting nitric acid / sulfuric acid mixed acid; then mixing with thiourea, and performing high-temperature annealing to realize nitrogen-sulfur co-doping, so as to form a donor-acceptor pair heterojunction in a C60 skeleton; and finally, ball-milling and mixing with ammonium iodide or potassium iodate, and pyrolyzing in an inert atmosphere, so that iodine atoms and defect sites of the carrier form a C-I-N or C-I-S coordination structure, and monatomic-scale dispersion is realized. Topological defect anchoring points are created in C60 through heterojunction engineering, so that the iodine loading capacity reaches 5.0 wt% or above, the cycling stability is remarkably improved, the electron structure is optimized through nitrogen and sulfur synergistic doping, the half-wave potential of the catalyst in the oxygen reduction reaction reaches 0.85 V or above, and the apparent rate constant of persulfate for activating and degrading pollutants reaches 0.45 min <-1 >. The method has the advantages of simple process and low raw material cost, and is suitable for preparing efficient non-metal catalysts in the fields of fuel cells, metal-air battery electrodes, advanced oxidation water treatment and the like.

The invention discloses a preparation method of ZIFs-based sericin protein composite aerogel capable of efficiently hydrating and converting CO2. The method comprises the following steps: firstly, carrying out carboxylation modification on sericin (SS), anchoring with Zn < 2 + >, and then adding 2-methylimidazole (2-MI) to prepare powdery ZIF-mono-Seri nano-enzyme with a lamellar structure; the ZIF-mono-SeriGel composite aerogel is compounded with sodium carboxymethyl cellulose (CMC), and finally the ZIF-mono-SeriGel composite aerogel is obtained. The carboxylated SS is preferentially coordinated with Zn < 2 + >, so that the ZIFs are promoted to be converted from a three-dimensional structure to a two-dimensional lamellar structure, high-dispersion growth of the ZIFs on an SS molecular chain is realized, and the catalytic activity of the ZIFs on a CO2 hydration reaction can be remarkably enhanced through an asymmetric coordination structure between interfaces of the carboxylated SS and Zn < 2 + >. In addition, the SS side chain is easy to form a hydrogen bond network, so that the proton transfer rate in the CO2 hydration reaction can be greatly accelerated, and the step is a speed limiting step of the reaction. The CMC is used as a reinforcing skeleton, so that the structure forming and immobilization of the nano-enzyme are realized, and the problems that a powder material is difficult to recycle and difficult to produce on a large scale in practical application and the like are effectively solved.

The invention discloses a synthesis method of a polyhalogenated nicotinic acid compound. The polyhalogenated nicotinic acid compound is a compound shown as a formula I, the synthetic route of the synthetic method is as follows: R1, R2, R3 and R4 are respectively and independently H, Cl, Br or F, and more than two (including the number) of R1, R2, R3 and R4 are halogens; x is Br or I; m is Mg or Li; the synthesis method comprises the following steps: 1, in a fluorine-containing solvent, carrying out an electrophilic halogenation reaction on a compound shown in a formula II to obtain a compound shown in a formula III; 2, performing halogen-metal exchange reaction on the compound shown in the formula III under the action of a metal organic reagent to obtain a compound shown in a formula IV; and introducing carbon dioxide into the compound as shown in the formula IV for carboxylation reaction to obtain the polyhalogenated nicotinic acid compound. According to the method, efficient electrophilic halogenation of polyhalogenated pyridine is realized on the basis of activation of an electron-deficient pyridine ring by a fluorine-containing solvent.

This invention relates to the field of copper alloy materials technology, specifically to a high-performance copper alloy wire and its preparation process. A high-performance copper alloy wire includes a base copper alloy wire and a corrosion-resistant protective layer. The base copper alloy wire, by mass percentage, comprises: 0.4-0.6% Cr, 0.05-0.2% Zr, 0.05-0.06% Hf, 0.01-0.03% Ce, 0.4-0.5% rare earth modified carbon nanotubes, with the balance being Cu. This invention improves the dispersibility of carbon nanotubes by first activating them with carboxylation and then modifying them with rare earth citric acid coupling agents. The uniformly dispersed carbon nanotubes can form a continuous conductive network in the copper matrix. At the same time, the lanthanum and cerium introduced during modification can purify the grain boundaries and reduce electron scattering at the grain boundaries, thereby effectively improving the conductivity of the copper alloy wire. In addition, the uniformly dispersed rare earth modified carbon nanotubes can effectively hinder dislocation movement and refine the matrix grains, thereby effectively improving the tensile strength of the copper alloy wire.

According to the post-consumption stainless steel powder and graphene reinforced wear-resistant composite material and the forming method thereof, firstly, post-consumption stainless steel powder is subjected to multi-stage magnetic separation and acid pickling impurity removal, and then ball milling treatment is conducted, so that the particle size of the powder is smaller; graphene is subjected to carboxylation and coupling agent treatment, so that the dispersity of graphene and the interface bonding force between the graphene and metal can be improved, then zinc borate is treated to improve the compatibility, and the wear resistance of the material can be improved by adding graphene and zinc borate; and nano aluminum oxide, the treated stainless steel powder, graphene and zinc borate are placed in a stirrer to be blended to improve the dispersion uniformity of the powder, then cold press molding is conducted, cracks are reduced in a stepped pressure reduction mode in the cold press process, and a prepared blank is subjected to surface passivation treatment to obtain the wear-resistant composite material. Compared with the prior art, the wear rate of the stainless steel powder is reduced, and the wear resistance, compressive strength and other properties of the obtained composite material are remarkably improved.

The invention belongs to the technical field of functional material preparation and catalysis, and provides a defective Cu (I)-based organic framework material, a preparation method thereof and application of the defective Cu (I)-based organic framework material in catalysis of carboxylation reaction of carbon dioxide. By regulating and controlling defects of different proportions, a series of novel Cu (I)-based defective organic frameworks rich in metal and Lewis alkali multi-element active sites are constructed by adopting a one-pot method; as a catalyst, in a reaction for synthesizing an acetylenic acid compound through carboxylation of carbon dioxide and aromatic alkyne with different substituent groups, synthesis of high-selectivity catalytic acetylenic acid under a normal pressure condition is realized. The organic framework material is easy to separate, the catalytic activity is not obviously reduced after the organic framework material is recycled for five times, the organic framework material has a stable structure and excellent adsorption and catalytic conversion dual functions on carbon dioxide, the problem that a current catalytic system is poor in comprehensive performance in the aspects of catalytic activity, stability, separation and reuse and the like is solved, and the organic framework material has a wide application prospect.