18results about How to "Efficient reduction" patented technology

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The invention discloses a cerium-based photosensitizer, a preparation method and application of the cerium-based photosensitizer in photocatalytic reaction, and relates to the technical field of coordination chemistry and photocatalysis. The general formula of the cerium-based photosensitizer is Ce (L1) 3 (L2) m, and L1 comprises a strong field anion ligand of at least one strong electron withdrawing group or a strong field anion ligand of a rigid structure; l2 is a neutral nitrogen-containing heterocyclic ligand, and m is 0 or 1. According to the invention, strong visible light absorption and long excited state life can be achieved by introducing L1, and the Ce < + > / Ce < 4 + > oxidation potential can be reduced to a mild range, so that the Ce < 4 + > intermediate can be efficiently reduced by a mild reducing agent generated in the reaction, and simple catalytic circulation without an external reinforced reducing agent is realized. When being applied to boronation reaction of various alkenyl / aryl / heteroaryl halides and various organic boron reagents, the photosensitizer shows high catalytic activity (the yield is as high as 91%), the performance is superior to that of a noble metal photosensitizer, but the cost is remarkably reduced, and the photosensitizer is environment-friendly.

The present invention relates a mechanical structure (also known as mounting structure) for installing cover plates of the pasta machine, a method for installing cover plates of the pasta making machine, and a pasta machine with brackets and cover plates.

The invention relates to the technical field of photocatalysts, in particular to a nonmetal plasmon heterojunction material, a preparation method and application thereof and a method for preparing p-aminophenol through reduction of p-nitrophenol. The nonmetal plasmon heterojunction material provided by the invention comprises a C3N4 nanosheet and a WO3-x nanoplate (x is 0.1 to 0.3) positioned on the surface of the C3N4 nanosheet. The WO3-x local surface plasmon characteristic can effectively expand the spectral response range of the non-metal plasmon heterojunction material in a visible region to a near-infrared region, and the light absorption efficiency of the non-metal plasmon heterojunction material is remarkably enhanced. The nonmetal plasmon heterojunction material provided by the invention can realize efficient reduction of p-nitrophenol based on the synergistic effect of an interface heterojunction, a built-in electric field and oxygen vacancies, is high in selectivity, has excellent photocatalytic activity for reduction of p-nitrophenol, and is excellent in photocatalytic activity stability.

The invention provides a bismuth-based core-shell structure catalyst and a preparation method and application thereof, and belongs to the technical field of electric energy catalytic conversion. The bismuth-based core-shell structure catalyst comprises Bi nanoparticles and a shell layer coating the Bi nanoparticles, the shell layer is of a mesoporous structure, and the material of the shell layer comprises a nitrogen-doped carbon material. According to the technical scheme, the bismuth-based core-shell structure catalyst is provided, the catalyst takes Bi nanoparticles as a core and a nitrogen-doped carbon material with a mesoporous structure as a shell, highly concentrated and small-size pore size distribution is shown, the adsorption performance on carbon dioxide is improved based on the space confinement effect, and the catalyst not only has relatively high catalytic activity, but also has a good application prospect. And the catalyst has extremely high formic acid production selectivity, can realize efficient electro-catalysis of reduction of carbon dioxide to produce formic acid, also has good stability, and shows good application prospects.

The application relates to the technical field of photocatalysis and heavy metal treatment, and particularly discloses a method for photocatalytic reduction of hexavalent chromium, which comprises the following steps: mixing a photocatalyst with a hexavalent chromium solution, adjusting the pH value to 1-7, stirring, and irradiating; wherein the photocatalyst is a bismuth molybdate nanoring; the method uses the novel bismuth molybdate nanoring as the photocatalyst to efficiently reduce the hexavalent chromium for the first time, the reaction rate is fast, the photocatalyst can be recycled, the method is green and environment-friendly, and the cost is low.

The invention relates to a formate dehydrogenase mutant and application thereof, and belongs to the field of enzyme engineering and carbon dioxide reduction. The invention provides a formate dehydrogenase mutant. The formate dehydrogenase mutant comprises a formate dehydrogenase catalytic subunit FdhA, an electron transport subunit FdhB and a membrane anchoring protein subunit FdhC, compared with formate dehydrogenase, the formate dehydrogenase mutant has the advantages that a membrane anchor protein subunit FdhC is deleted, or the membrane anchor protein subunit FdhC and an electron transport subunit FdhB are deleted. Compared with the existing formate dehydrogenase, the formate dehydrogenase mutant provided by the invention has high activity and can tolerate oxygen at the same time. The formate dehydrogenase mutant provided by the invention shows huge potential value in the carbon dioxide immobilization industry.

This invention discloses a method and apparatus for constructing a microdroplet self-Fenton system. The construction method includes the following steps: mixing an iron salt with an acidic solution, and subjecting the resulting mixed solution to ultrasonic atomization to form micron-sized droplets, thereby obtaining the microdroplet self-Fenton system. The construction apparatus includes an atomizing reactor for storing the mixed solution and an ultrasonic generator for providing ultrasonic waves. The microdroplet self-Fenton system constructed by this invention has the following advantages: good adaptability, enabling the acquisition of a self-Fenton system under conditions of no light, no catalyst, and no sacrificial agent; it helps to increase the generation rate and yield of ·OH in the system, giving the system stronger redox capabilities and enabling efficient degradation of organic pollutants, providing important guidance for promoting the effective treatment of organic pollutant wastewater; the process is simple, easy to operate, low in cost, environmentally friendly, suitable for industrial applications, and facilitates the effective treatment of organic pollutant wastewater.

This invention provides an in vitro simulated blood vessel device and an embolic agent performance evaluation device. The in vitro simulated blood vessel device includes an interventional device port, a basic vascular access, a biomimetic arterial module, a pressure measuring module, a first resistance valve, a pump tank, a pulse pump, and a flow meter, all connected sequentially via tubing. The pressure measuring module enables real-time monitoring of the fluid pressure in the tubing, thereby monitoring the stability of the embolization. The transparent biomimetic blood vessel tubing highly replicates the vascular structure, providing a realistic vascular simulation environment and facilitating long-term observation of the embolic agent's status and the patency of the embolic area. This device can be widely used for in vitro performance testing and evaluation of embolic agents and other implantable medical devices.

The invention provides a preparation method and application of a ternary rare earth metal alloy particle (at) porphyrin COF mimic enzyme. The preparation method comprises the following steps: suspending porphyrin COF in an ethanol solution containing ternary rare earth metal ions M13 < + >, M23 < 3 + > and M33 < 3 + >, and carrying out a stirring reaction in an N2 atmosphere; after stirring is completed, suction filtration and ethanol washing are conducted, and porphyrin COF solids adsorbed with ternary rare earth metal ions are obtained. And suspending in absolute ethyl alcohol, dropwise adding a NaBH4 ethanol solution while stirring, carrying out stirring reaction in a dark place, centrifuging the suspension, washing with ethanol and deionized water, and carrying out vacuum drying to obtain the mimic enzyme. The invention also provides application of the mimic enzyme in visible light driven CO2 reduction preparation of ethylene. The method adopts room-temperature reaction, takes visible light as an energy source and water as a solvent and a hydrogen source, is green and environment-friendly, high in reduction product generation efficiency and high in ethylene selectivity, and is a green, efficient and practical method for preparing ethylene through CO2 reduction.

The application provides a rock moisture diffusion coefficient determination and water absorption process simulation method and related equipment, which is used for characterizing the water absorption state of each particle at a mesoscopic level through a mesoscopic saturation coefficient on the basis of a particle discrete element technology, realizing numerical fine modeling, and thus can accurately and efficiently restore the rock water absorption process, thereby having significantly improved practical value.

The invention discloses a method for obtaining and separating primary hepatic tumor cells and application thereof, and relates to the technical field of cytobiology, tumor research and antitumor drug development, the method is characterized in that MYC and AKT double genes are adopted in a mouse body to drive and induce liver cancer, and the primary hepatic tumor cells are obtained and separated from obtained liver cancer tissues. And the stable mouse liver tumor cell line (MLAML-1001D) is established and obtained. The liver cancer model constructed by double-gene driving has a complete tumor microenvironment, and highly simulates and restores the physiological microenvironment of liver cancer of clinical patients in the aspects of interaction of tumor cells and stromal cells, interaction of cells and extracellular matrix, interaction of tumor cells and immune cells and the like; therefore, a more accurate and efficient model is provided for researching growth, invasion and metastasis mechanisms of liver cancer and screening and evaluating liver cancer related drugs.

The application belongs to the technical field of water treatment agents, and particularly relates to a multifunctional composite water purifying agent and a preparation method thereof, which comprises the following raw materials in parts by weight: multifunctional water purifying powder 90-100 parts, bentonite 8-10 parts, sodium carboxymethyl cellulose 0.5-1.5 parts, sodium percarbonate 0.5-1 part and sodium citrate 0.5-1 part; the multifunctional water purifying powder comprises core layer material and shell layer slurry; the multifunctional water purifying agent of the application takes the multifunctional water purifying powder with a core-shell structure as a core, cooperates with bentonite, sodium carboxymethyl cellulose, sodium percarbonate and sodium citrate, realizes efficient and synchronous removal of heavy metals, organic matters, colority and microorganisms, and has the advantages of wide spectrum, stability and easy recovery.

The invention discloses a leaf vegetable pot seedling discrete element model modeling method based on an EDEM technology, and relates to the field of simulation leaf vegetable pot seedling modeling, and the method comprises the following steps: firstly, obtaining pot seedling geometric feature data, constructing a three-dimensional solid model, and then segmenting the three-dimensional solid model into sub-models according to leaves, stems and matrix pot bodies; for the blade, generating element particle coordinates by extracting a mid-plane and meshing the mid-plane; and aiming at the stem part and the matrix bowl body, generating a particle coordinate by adopting a method based on structural characteristics. After all coordinates are integrated and optimized, contact mechanical parameters of all parts are calibrated through a physical test, and finally a leafy vegetable pot seedling discrete element model with the high reduction degree is generated in the EDEM. According to the method, the time and resource cost of related scientific researchers in modeling preparation, EDEM modeling and simulation calibration processes are greatly saved, and the repeatability, controllability and reliability of a simulation test are remarkably improved.

The application belongs to the technical field of material preparation, and discloses a preparation method of a light-thermal catalyst capable of realizing carbon dioxide reduction. The method is solvent-thermal, and uses multilayer Ti3C2 MXene as a substrate, thiourea as a sulfur source, ethanol as a solvent, and ethylene glycol as a binder. The method combines the principles of sulfuration and in-situ intercalation, generates TiS2 in-situ between the multilayer Ti3C2 layers, thereby increasing the reaction active sites of the catalyst for CO2 reduction, improving the absorption capacity of the catalyst for near-infrared light, and fully exerting the light-thermal conversion characteristics of the material.

This invention discloses a steel pipe tower for power transmission lines and its design method. The tower includes two main poles, a steel crossarm, guy wires, and fork beams. The two main poles are vertically arranged and parallel to each other. The steel crossarms are fixed to the upper ends of the two main poles. Guy wires are installed at the connection between the steel crossarms and the two main poles. At least one set of fork beams is installed on the two main poles below the steel crossarms. The design method includes the following steps: acquiring all points and pole information in a GIM model; performing initial pole selection, identifying three types of poles; refining pole selection step by step based on the initial selection results; displaying the identified poles in a graphical and tabular format; and calculating the steel pipe poles based on the pole model information. The design method of this invention has a high degree of automation and strong model recognition accuracy; the use of visual graphical and tabular design allows users to easily fine-tune the poles; and comprehensive consideration based on model layout restoration can reduce the cost of steel pipe pole design.

A method for simultaneous treatment of sulfur-containing and nitrogen-containing oxide mixture, MoS2 / Fe2O3 is used as photoanode, copper nanowire modified foam copper is used as cathode, Ag-AgCl is used as reference electrode, and sodium hydroxide solution is used to absorb SO2 and NO x The sulfite solution and nitrate solution formed by the mixture are used as electrolyte to constitute a three-electrode system photoelectrochemical cell, the nitrate is reduced to ammonia nitrogen by using the copper nanowire modified foam copper cathode, the MoS2 / Fe2O3 photoanode in-situ activates the sulfite to sulfite free radical and sulfate free radical, then the sulfate free radical selectively oxidizes the ammonia nitrogen to nitrogen, thereby realizing the simultaneous treatment of sulfur-containing and nitrogen-containing oxide mixture. The method has the characteristics of high selectivity, rapidness, high efficiency and energy saving.

This invention discloses a plasma metal Bi / oxygen vacancy-BiOBr photocatalytic material, its preparation method, and its applications. The preparation method includes the following steps: dissolving a bromide salt in 1,2-propanediol to obtain a dispersion; adding a bismuth salt to the dispersion and mixing thoroughly to obtain a reaction solution; subjecting the reaction solution to a hydrothermal reaction; and cooling, separating, washing, and drying the resulting material to obtain the target product. This invention uses 1,2-propanediol as a solvent and a reducing agent, simultaneously introducing plasma metal Bi and oxygen vacancies into BiOBr through a hydrothermal reaction to enhance its catalytic performance. Furthermore, the addition of lignin to the reaction system further promotes the formation of plasma metal Bi and oxygen vacancies. The material prepared by this invention can be used for the oxidation-reduction of 2,4-dichlorophenol in water and for CO2 reduction, effectively remediating the environment and achieving energy conversion, showing great application potential.