76results about How to "Inhibition of recombination" patented technology

The invention relates to a catalyst for decomposing hydrogen sulfide by photocatalysis and a preparation method of hydrogen and liquid sulfur by employing same. The catalyst comprises a carrier, active component and assistant and has the characteristics that the carrier is one or more selected from vanadate, niobate and tantalate, the active component is one or more selected from alkali metal hydroxide, alkaline earth metal hydroxide, alkali metal nonmetal oxysalt, alkali metal nonoxysalt, alkaline earth metal nonmetal oxysalt and alkaline earth metal nonoxysalt and the assistant is lanthanide oxide or VIII group oxide. The catalyst of the invention can be used for preparing hydrogen and liquid sulfur so that the produced sulfur is easy to be separated from the catalyst, the catalyst can be recycled and the sulfur contained in hydrogen sulfide can be fully recycled, thus realizing the comprehensive utilization of hydrogen sulfide.

The invention relates to a photoemission ionization source, which utilizes photoelectric effect generated when ultraviolet light irradiates metal and photochemical reaction generated when the ultraviolet light irradiates a carrier gas. The photoemission ionization source comprises three parts, namely an ultraviolet light source, a metal mesh or a metal ring, and the carrier gas. The ultraviolet light irradiates the surface of the metal mesh or an inner ring of the metal ring to generate low-energy photoelectrons. The photoelectrons can be adsorbed onto an object to be tested to ionize the object, and simultaneously the photoelectrons can be adsorbed onto a product of the photochemical reaction of the carrier gas, namely O3 to generate O3<->. The O3<-> or aqua ions thereof, namely O3<->(H2O)n are reacted with CO2 in air to generate Co3<->(H2O)n (n=0-3); and the Co3<->(H2O)n can be used as an ion of a reagent to react with the object to be tested to ionize the object to be tested. When the photoemission ionization source is applied to ion mobility spectrometry, the use of a radioactive ionization source can be avoided, the sensitivity of the ion mobility spectrometry is improved andthe industrialization of the ion mobility spectrometry is facilitated.

A porous film semiconductor photoemitter with visible light response formed by a porous structure complex metal oxide semiconductor is used in photoelectric chemical cell reacted in the energy storage. The said photoemitter is composed of more than two kinds of elements: an is one of Bi, Ag, Cu, Sn, Pb, V, In, Pr Cr and Ni, B is selected from Ti, Nb, Ta, Zr, Hf, Mo, W, Zn, Ga, In, Ge and Sn. This invented simple device alters the visible light such as the sunlight to hydrogen chemical energy effectively, even if the photoemitter has very low quantum absorptivity yet it will approach to 100% so long as the filming method is perfect.

The invention relates to a catalyst and a method for improving the selectivity of preparation of aromatic hydrocarbon products from methanol in order to mainly solve the problem of low aromatic hydrocarbon yield caused by generation of a large amount of low carbon alkanes due to a hydrogen transfer reaction in the aromatization process. ZSM-5 molecular sieve is modified with different concentrations of Zn, Ag, Ni, Mo, Cu, Pt, Ga and other dehydrogenation metals, the modified ZSM-5 molecular sieve is processed to contain high valence oxide of V, Ce, Fe, La, Co, Au or Cr, the obtained ZSM-5 molecular sieve catalyzes efficient aromatization of methanol in weak oxidation gas and other inert diluted gas mixed reaction atmosphere, the partial pressure ratio of methanol is 0.1-10, the reaction temperature is 350-550DEG C, and the operating pressure is 0.1-4.0MPa. A catalyst is used to accelerate dehydrogenation aromatization of intermediate olefin substances, and the high valence metal oxide in the catalyst accelerates activation, and cooperates with weak oxidation gas to realize in situ elimination of hydrogen, so the alkane content in the product reaches the aromatic hydrocarbon selectivity improving purpose, and the aromatic hydrocarbon selectivity is higher than 72wt%.

The invention provides a method for preparing a binary composite catalyst from nano-TiO2 particles and g-C3N4 quantum dots with a sol-gel method. The method comprises the following steps: anatase nano-TiO2 particles are prepared firstly with the sol-gel method, then the g-C3N4 quantum dots are added to the nano-TiO2 particles, ultrasonic processing and water bath heating stirring are performed, the nano-TiO2 particles and the g-C3N4 quantum dots are mixed, and the heterojunction composite material with excellent photocatalytic performance is obtained. Compared with the conventional TiO2 materials, the composite material has excellent photocatalytic performance and has very good application prospect in the field of photocatalysis treatment of organic pollutants.

The invention discloses a method for hydrolyzing biomasses in two steps by utilizing a carbon-based solid acid catalyst. The method comprises the following steps: (1) putting the carbon-based solid acid catalyst and biomass materials into a reactor at the mass ratio of (2 to 5) : 1; adding water into the reactor at the mass ratio of the biomass materials of the water of 1 to (10 to 40); after heating a mixture to 120 DEG C to 150 DEG C, reacting for 2 to 3 hours; separating hydrolysate, discharging the hydrolysate into a storage tank for storing pentose, and storing; (2) adding water into the reactor at the mass ratio of the biomass materials of the water of 1 : (10 to 40); after heating the mixture to 140 DEG C to 180 DEG C, reacting for 2 to 4 hours; separating hydrolysate, discharging the hydrolysate into a storage tank for storing hexose, and storing; (3) emptying the materials in the reactor and preparing for the next reaction cycle. According to the method disclosed by the invention, hemicellulose and cellulose in the biomass materials can be effectively catalyzed and be subjected to a hydrolysis reaction, and the method has the characteristics of high hydrolysis rate and high sugar yield.

The invention relates to a molecular sieve with a photocatalysis function, and a preparation method of the molecular sieve. The molecular sieve comprises an HZSM-5 molecular sieve, and is characterized in that strontium titanate photocatalyst is compounded on the modified HZSM-5 molecular sieve by a sol-gel method; electron-hole pairs are generated by the photocatalyst particles which are loaded in pore channels and surface of the molecular sieve and are irradiated by ultraviolet light; the interiors of the pore channels of the molecular sieve have very strong electric field intensity, and electrons are gathered on the surface of the molecular sieve, so that the electron-hole pairs are prevented from being compounded, and free active groups are very easily obtained by the organic matter absorbed by the molecular sieve; and therefore, the photocatalytic activity of the photocatalyst can be improved.

The invention discloses a composite visible-light-induced catalyst and a preparation method and application thereof. The composite visible-light-induced catalyst is prepared from CNT-silver citrate and g-C3N4-PO43- through a precipitation method, wherein the CNT-silver citrate is prepared from CNT, sodium citrate and AgNO3 through surface complexing action, and the g-C3N4-PO43- is prepared from g-C3N4 and NaH2PO4 through surface phosphorylation. The preparation method includes the steps of preparation of the CNT-silver citrate, preparation of the g-C3N4-PO43- and preparation of CNT / Ag3PO4 / g-C3N4. The composite visible-light-induced catalyst can be applied to treatment of antibiotic wastewater and has the advantages of high visible light utilization rate, stable presence in water and stable photocatalytic performance.

The invention discloses a reaction system capable of hydrolyzing biomass through two steps by the aid of a carbon-based solid acid catalyst. Carbon-based solid acid is taken as a catalyst, biomass materials are completely hydrolyzed through a two-step reaction, and a xylose / xylan and glucose / glucose reaction system is obtained. By the use of the system, two-step hydrolysis of biomass materials can be realized under the condition that the operation strength in the reaction process is reduced, no corrosion is caused to a reaction device, follow-up waste liquids are not required to be neutralized, and the operation cost is reduced; after the reaction, heat of hydrolysate is recovered, and input of total heat of the system is reduced.

The invention discloses a preparation method of a photocatalyst Pt-ZnGa2O4 efficient in CO2 reduction under sunlight drive. The method includes: (1) dissolving zinc nitrate and gallium nitrate into deionized water to form a mixed solution, wherein a ratio of the zinc nitrate to the gallium nitrate is 1:2; (2) adding polyethylene glycol into the mixed solution, and adding 20% ammonia water dropwise to regulate a pH value of the solution to be weakly alkaline; (3) transferring a reaction system to a reaction kettle to realize hydrothermal and aging reactions; (4) subjecting reaction products to leaching, washing, drying and calcining to obtain ZnGa2O4 high in specific surface area; (5) dispersing the ZnGa2O4 into deionized water, and adding chloroplatinic acid to realize reduction deposition of Pt4+ onto the surface of the ZnGa2O4; (6) centrifugally separating the products, washing with deionized water, and drying to obtain the Pt-ZnGa2O4. By the preparation method, uniform particles, simplicity, energy saving, environment friendliness and stability are realized, and the photocatalyst Pt-ZnGa2O4 is efficient in CO2 reduction under sunlight irradiation.

The plant antifreezing liquid is compounded with purslane as main material and through extraction, and compounding the extracted liquid with ascorbic acid, glucose, cane sugar, algin sodium, glycerin and choline chloride. The present invention as one kind of natural preparation has no toxicity, no harm and no environmental pollution, and may be sprayed to foliage, flower and bud easily to reach effective antifreezing period of 10-20 days.

The invention discloses a molecular sieve material loaded with a bismuth titanate photocatalyst and a preparation method of the molecular sieve material. The method is characterized by comprising the following steps: loading the bismuth titanate photocatalyst on a molecular sieve subjected to ion exchange with hydrochloric acid by a sol-gel method. According to organic matter adsorbed by the molecular sieve material disclosed by the invention, free active genes can be easily obtained, so that the catalyst activity is improved.

Disclosed is a bipolar semiconductor device which is capable of reducing the surface state density of a bipolar transistor and increasing the current gain of the transistor, thereby improving the transistor performance. A bipolar semiconductor device (100) has a surface protective film (30) on the surface of a semiconductor element. The surface protective film is composed of a thermal oxide film (31) formed on the surface of the semiconductor element, and a deposited oxide film (32) formed on the thermal oxide film. The deposited oxide film contains at least one of hydrogen element and nitrogen element in an amount of not less than 1018 cm-3.

The present invention provides an electrode unit and an ion generator with the electrode unit. The electrode unit increses performance-price ratio through simplifying the structure and reducing cost and prevent recombination through increasing the injecting velocity for increasing the static eliminating capacity. The electrode unit (20) comprises the following components: a needle electrode (21) which is provided with a sharp front end (210) that is approximate conical; a unit body (24) which is provided with a storing space (248) that covers the periphery of needle electrode (21) and an injecting opening (251) from which the sharp front end (210) of the needle electrode (21) projects. The storing space (248) comprises a conical injecting space (249) which is higher than the sharp front end (210) of the needle electrode (21) and has a vertex angle above the vertex angle of the sharp front end (210). The ion generator (1) is installed with a plurality of electrode units (20).

The invention relates to a preparation method for single-layer molybdenum disulfide nanosheets. The method comprises the following steps: (1) 200-250mg of molybdenum disulfide powder with a particle size less than 2 micrometers, 90-110mg of chitosan powder, 1-1.2g of an ionic liquid and 10-15mL of an organic solvent are uniformly mixed and transferred to a sealed glass container, so a first dispersion solution is obtained; (2) the first dispersion solution is subjected to ultrasonic treatment, after the ultrasonic treatment is finished, high-speed centrifugation separation is performed, and a precipitate is collected; (3) the precipitate obtained in the step (2) is dispersed in an acetic acid solution with a concentration of 0.5%, centrifugation separation is performed, a precipitate is collected, and the above process is repeated for two times; and (4) the precipitate obtained in the step (3) is dispersed in deionized water, low-speed centrifugation separation is performed, and a supernatant is collected, so a single-layer molybdenum disulfide nanosheet solution is obtained. According to the invention, the process is simple, costs are low, the yield is higher than 25%, repeatability is good, and defects of large size, a low single-layer yield, nonuniform particle size and the like of molybdenum disulfide nanosheets obtained in the prior art can be overcome.

The invention discloses a manufacturing method of magnetic CoFe2O4 / MCM-41 / TiO2 composite materials and relates to a manufacturing method of composite materials. The technical problem that an existing photocatalyst is narrow in response range, low in photocatalytic performance and difficult to recycle is solved. The method comprises the steps that first, CoFe2O4 is manufactured; second, CoFe2O4 / MCM-41 is manufactured; and third, CoFe2O4 / MCM-41 / TiO2 is manufactured. TiO2 particles loaded in an MCM-41 hole channel and on the surface of the MCM-41 hole channel generate electron-hole pairs under the condition of UV irradiation, strong electric field intensity is achieved in the MCM-41 hole channel, electrons are gathered on the surface of the MCM-41 hole channel, accordingly, the effect of electron-hole pair combination is restrained, organic matter adsorbed by MCM-41 can obtain free active groups easily, and therefore the photocatalytic activity of the photocatalyst is improved. The method belongs to the field of photocatalytic material manufacturing.

The invention relates to the technical field of lithium ion negative electrode materials, and discloses a preparation method of a graphene / solid carbon sphere lithium ion negative electrode plate anda button lithium ion battery. According to the scheme of the invention, solid carbon spheres are introduced into a graphene material, the excellent conductive property of graphene is combined with thesolid carbon spheres rich in pore structures, the two generate a synergistic effect, on the one hand, graphene oxide and the solid carbon spheres may generate a polymerization reaction, and thus thesolid carbon spheres and graphene have a bonding effect, and a uniform graphene-solid carbon sphere composite structure can be formed, and on the other hand, the existence of the solid carbon spheresalso prevents the re-stacking of graphene plate layers and effectively reduces the aggregation of graphene. According to the scheme of the invention, through secondary heating calcination, the problemthat graphene that has been dispersed may be recombined into thicker graphite due to rapid heating can be avoided, and the phenomenon that the solid carbon spheres and graphene are compounded to generate the synergistic effect can be better facilitated.

The invention relates to the technical field of lithium ion negative electrode materials, and discloses a graphene / zinc oxide coated solid carbon sphere lithium ion battery negative electrode materialand a preparation method thereof. The preparation method includes the following steps of S1, preparing a solid carbon sphere; S11, preparing an aqueous glucose solution, adding the solution to a reactor for hydrothermal reaction, after the reaction, naturally cooling, centrifuging to pH of 7, then drying, and calcining the dried product to obtain the solid carbon sphere; S2, dissolving graphene in deionized water, adding a dispersant, performing ultrasonic dispersion to obtain a graphene solution, then successively adding zinc nitrate and ammonia water to the graphene solution, stirring uniformly for 2-6 h in a 90 DEG C water bath, then adding the solid carbon sphere, stirring uniformly, transferring to an autoclave, performing hydrothermal reaction for 6-24 h at 90-120 DEG C, and after the reaction, centrifuging and drying; S3, calcining the dried product to obtain the graphene / zinc oxide coated solid carbon sphere lithium ion battery negative electrode material.

The invention relates to a preparation method of a UiO-66 loaded tin sulfide nanoparticle photocatalyst, wherein the method comprises the steps: by using zircon salt and an organic ligand as precursors and a polar solvent as a dispersing agent, preparing regular octahedron UiO-66 white solid powder by a solvothermal method; dispersing the regular octahedron UiO-66 white solid powder into distilledwater, and stirring at room temperature to form a uniform milk white solution; sequentially adding a tin source and a sulfur source into the milk white solution, ultrasonically dissolving and stirring for 20-50 min, transferring into an autoclave with a polytetrafluoroethylene lining, heating at constant temperature, cooling to room temperature, and centrifugally separating to obtain an orange product; and finally, sequentially washing the orange product with absolute ethyl alcohol and distilled water, and drying overnight to obtain the UiO-66 loaded tin sulfide nanoparticle photocatalyst recorded as SnS2NPS@UiO-66. The preparation method is simple to operate, the raw materials are easy to obtain, the cost is low, and the obtained photocatalyst has excellent photocatalytic degradation performance.

The present invention is provided with an interface layer that minimizes interdiffusion between a silicon substrate and copper electrode wiring that are used as a solar cell, that improves the adhesive properties of copper wiring, and that is used to obtain ohmic contact characteristics. This silicon solar cell comprises a silicon substrate (1) and is provided with a metal oxide layer (100) that is formed on the silicon substrate and wiring (10) that is formed on the metal oxide layer and that comprises mainly copper. The metal oxide layer contains (a) one of either titanium or manganese, (b) one of vanadium, niobium, tantalum, or silicon, and (c) at least one of copper and nickel. In addition, the metal oxide layer comprises copper or nickel as metal particles that are diffused in the interior of the metal oxide layer.

The invention provides a cerebroprotein hydrolysate freeze-dried powder injection and a preparation method thereof. The preparation method includes: taking a pig brain, removing impurities, adding purified water to conduct homogenization; subjecting the obtained homogenate to hydrolysis by pepsin and pancreatin successively, and collecting the clear liquid; adjusting the pH of the clear liquid to 1.7-3, conducting heating to 100-110DEG C and performing heat preservation for 15-45min, and then adjusting the pH to 8.0-9.0; carrying out ultrafiltration by a 8-10kd membrane, and collecting the filtrate; subjecting the filtrate to column chromatography, adjusting the pH of the eluent to 8.0-9.0, performing concentration by an anion exchange membrane, and conducting filtering by a membrane of 0.2 micrometer to obtain a stock solution; freezing the stock solution, then performing thawing, adding an excipient, adjusting the pH to 6.9-7.5, carrying out 8-10kd membrane ultrafiltration, and performing filtration by a 0.2 micrometer membrane; and carrying out filling and freeze-drying. In the obtained freeze-dried powder injection, the similarity of polypeptide and a reference substance is greater than or equal to 0.90, and the freeze-dried powder injection contains 16 amino acids, the nitrogen content of total amino acids accounts for greater than or equal to 85% of the total nitrogen content, and no additional amino acids are needed. The cerebroprotein hydrolysate freeze-dried powder injection is prepared entirely by pig brain hydrolysis, and is stable and safe.

The invention relates to a CuNi-Cu2O / NiAlOx nano composite material with a two-dimensional layered structure. The CuNi-Cu2O / NiAlOx nano composite material comprises CuNi, Cu2O and NiAlOx. The preparation method comprises the following steps of: (1) fully dissolving a copper salt, a nickel salt and an aluminum salt in deionized water, and synthesizing CuNiAl-LDH with a two-dimensional nanosheet structure through a hydrothermal synthesis method; (2) calcining the prepared CuNiAl-LDH to form a multi-metal oxide which is uniformly dispersed; and (3) carrying out high-temperature reduction on a prepared multi-metal oxide in an H2 atmosphere to obtain the CuNi-Cu2O / NiAlOx nano composite material. The nano composite material is applied to photocatalysis, and especially can be used for converting aromatic nitro compound pollutants into aromatic amino compounds. The photoreaction catalyst has excellent photocatalytic performance and is relatively stable. The process is simple, the preparation condition is universal, the product is stable in morphology and high in purity, product treatment is convenient and simple, and the method is suitable for medium-scale industrial production.

The invention provides a preparation method of a double-crystal-form TiO2 photocatalytic material modified on G (graphene). Firstly, TALH, GO (graphene oxide) and urea are taken as raw materials, and single-crystal anatase TiO2 / G, double-crystal anatase-brookite TiO2 / G and single-crystal brookite TiO2 / G are prepared with a hydrothermal synthesis method. During experiments, the phase composition of the double-crystal anatase-brookite TiO2 / G is controlled through adjustment of the concentration of the urea in a TALH solution. The photocatalytic activity of a synthesized double-crystal anatase-brookite TiO2 / G composite material is tested through degradation of a methyl orange solution. The composite material belongs to an inorganic photocatalytic material, is stable in performance, higher in photocatalytic activity and resistant to chemical corrosion and photocorrosion and has important significance in aspects of water photolysis, sterilization, preparation of solar sensitized batteries, environmental protection and the like.

The invention provides a carbon nitride based material for photocatalytic water total decomposition as well as preparation and application thereof. The carbon nitride based material for the photocatalytic water total decomposition, provided by the invention, is characterized by comprising a carbon nitride carrier; and monatomic palladium is loaded on the carbon nitride carrier. Compared with puregraphite-phase carbon nitride and palladium nanoparticle loaded carbon nitride, the carbon nitride based material provided by the invention has better catalytic activity and stability.

The invention relates to a preparation method of a carbon quantum dot / titanium dioxide composite photocatalyst. The preparation method comprises the following steps: S1, titanium alkoxide and anhydrous ethanol are taken, and are stirred uniformly to obtain a liquid A; S2, glacial acetic acid, distilled water and anhydrous ethanol are taken, and are stirred well to obtain a liquid B, the pH value of the liquid B is adjusted to 2-3, carbon quantum dots are added to the liquid B, and mixing is performed to uniformity in order to obtain a liquid B containing carbon quantum dots; S3, the liquid A is dropwise added to the liquid B containing carbon quantum dots at a certain temperature, and the obtained mixture is uniformly stirred and reacted to obtain a sol; and S4, the sol obtained in step 3is dried, then is taken out after the drying is completed, is ground, and is calcined to obtain the carbon quantum dot / titanium dioxide composite photocatalyst. The composite photocatalyst prepared inthe invention has the advantages of good effect and uniformity in compounding of the carbon quantum dots and titanium dioxide, and excellent photocatalytic performance.

The invention relates to the technical field of lithium ion negative electrode materials, and discloses a graphene / zinc oxide wrapped solid carbon sphere lithium ion negative electrode plate and a preparing method of a buckle type lithium ion battery thereof. A solid carbon sphere is introduced into a graphene / zinc oxide material, and the excellent electric conductivity of graphene and the rich porosity structure of the solid carbon sphere are combined and have a synergistic effect; on one hand, polymerization reaction can happen between graphene oxide and the solid carbon sphere, and therefore the bonding effect is achieved between the solid carbon sphere and graphene, and a uniform graphene-solid carbon sphere composite structure can be formed; on the other hand, due to the existence ofthe solid carbon sphere, graphene sheet layers are prevented from being stacked again, and the agglomeration of graphene is effectively reduced.

The invention provides a cerebrolysin hydrolysate injection and a preparation method thereof. The preparation method comprises the following steps: taking pig brain, removing impurities, and adding purified water for homogenizing; hydrolyzing homogenate through pepsin and pancreatin, and collecting a clear liquid; regulating the pH of the clear liquid to be 1.7-3, heating to 100-110 DEG C, insulating for 15-45min, then regulating pH to 8.0-9.0; conducting ultrafiltration through a 8-10kd membrane, and collecting filtrate; conducting column chromatography to the filtrate, collecting an eluent, regulating ph to 8.0-9.0, concentrating through an anion-exchange membrane, filtering through a 0.2mu m membrane to obtain a stock liquid; and freezing the stock liquid, then defreezing, adding an antioxidant, regulating the pH to be 6.9-7.5, and filtering respectively through a 8-10kd membrane and a 0.2mu m membrane. The polypeptide in the obtained cerebrolysin hydrolysate injection is similar to that of a control drug being more than or equal to 0.90, and the obtained cerebrolysin hydrolysate injection contains 16 amino acids, the nitrogen amount of total amino acids accounts for more than or equal to 85% of total nitrogen content, additional amino acids are not required, and the amino acids can be prepared completely by means of pig brain, thus being stable and safe.

The invention relates to a preparation technology of a carbon-yttrium modified titanium dioxide photocatalyst, belonging to the technical field of modified titanium dioxide photocatalysts. The preparation technology comprises the steps of preparing precursor sol by taking tetrabutyl titanate as a raw material and adopting a sol-gel method; then, doping the precursor sol with modifying elements, and stirring to obtain gel; drying, crushing and calcining the gel to obtain modified titanium dioxide. According to the preparation technology, the doped modifying elements are C and Y; the concrete process of doping the modifying elements comprises the steps of firstly, dropwise adding a yttrium nitrate solution into the precursor sol, then dropwise adding a glucose solution, and controlling the molar ratio of the Y to the C to the TiO2 in the modified titanium dioxide to be (0.002-0.006): (0.06-0.54): 1. The preparation technology is simple in operation, creatively enables the titanium dioxide to be doped with the C and the Y, and achieves a synergistic effect by combining the titanium dioxide with the C and the Y; furthermore, the doped Y and C can effectively inhibit the increment of the grain size of the titanium dioxide, so that the specific surface area of the titanium dioxide is enlarged, and the photocatalytic performance of the titanium dioxide is improved.