570 results about "Hydrothermal synthesis" patented technology

The invention discloses an application of a molybdenum disulfide-based piezoelectric catalytic material in a seawater uranium extraction material, and relates to the technical field of seawater uranium extraction, thiourea and sodium molybdate are used as precursors, and a MoS2 nanoflower with a specific 1T / 2H composite crystal structure is constructed through a hydrothermal synthesis technology. The method is placed in a uranyl nitrate solution, ultrasonic treatment is combined, efficient extraction of uranium can be achieved, and the method has potential application to extraction of uranium from seawater. The method is simple in process and environment-friendly, almost does not generate harmful waste in the synthesis process, does not need complex operation, and has good amplification preparation potential.

The invention belongs to the technical field of environment-friendly materials and wastewater treatment, and particularly relates to a tungsten slag-based fluorine removal agent and a preparation method thereof.The preparation method of the tungsten slag-based fluorine removal agent comprises the following steps that S1, tungsten slag and lithium slag are obtained; s2, sequentially drying, grinding and sieving the tungsten slag to obtain a first raw material, and sequentially drying, grinding and sieving the lithium slag to obtain a second raw material; s3, mixing the first raw material, the second raw material and water according to a certain proportion to obtain a slag-water mixture; s4, the slag-water mixture is adjusted to be acidic, the slag-water mixture is subjected to a hydrothermal synthesis reaction, washing and drying are conducted after filtering, and the tungsten slag-based fluorine removal agent is obtained; according to the method, the tungsten slag and the lithium slag are mixed, then the tungsten slag-based fluorine removal agent is synthesized through the hydrothermal method, the obvious removal effect on fluorine in waste water is achieved, the purpose of treating waste with waste is achieved, and high-value utilization of the tungsten slag and the lithium slag is achieved.

The invention belongs to the technical field of preparation and application of nano materials, and relates to a preparation method and application of amino-functionalized cerium oxide nano enzyme, and the preparation method comprises the following steps: adding 3-aminophenylboronic acid into a cerous nitrate hexahydrate aqueous solution to obtain a mixed solution; dropwise adding a sodium hydroxide aqueous solution into the mixed solution, carrying out hydrothermal reaction, cooling after the reaction is finished, centrifuging, washing and drying to obtain milk white powder, namely the amino-functionalized cerium oxide nano-enzyme. The boron element is introduced in the preparation of the cerium oxide nano-enzyme, and the amino-functionalized cerium oxide nano-enzyme is prepared by adopting a simple one-step hydrothermal synthesis method, so that the nano-enzyme has good phosphatase-like activity, has high selectivity and sensitivity to LPS, and is short in detection time, high in sensitivity, low in detection limit, simple in preparation process and high in preparation efficiency; the product is good in quality, high in stability, environment-friendly and extremely wide in market prospect.

The invention belongs to the technical field of catalytic materials, particularly relates to an electrocatalytic anode oxygen evolution reaction catalyst based on an anion exchange membrane electrolytic cell, and particularly relates to a high-entropy oxide electrocatalyst and a preparation method thereof. The high-entropy oxide electrocatalyst is composed of five metal elements of Ni, Co, Fe, Mn and Al, is loaded on a foamed nickel substrate, has a nanosheet structure, is rich in oxygen vacancies on the surface, has excellent electrochemical catalysis performance and stability, and is suitable for electrocatalysis of an electrolytic water anode side in an alkaline environment. According to the preparation method of the high-entropy oxide electrocatalyst, foamed nickel is used as a substrate, salts of five metals of Ni, Co, Fe, Mn and Al which are equal in mole are subjected to hydrothermal synthesis to form a precursor, and then the high-entropy oxide electrocatalyst is prepared through self-etching, annealing oxidation and acid etching, and the high-entropy oxide electrocatalyst is easy and convenient to operate, good in repeatability, controllable in cost, excellent in performance and suitable for large-scale production.

The invention provides a preparation method of nitrogen and phosphorus-doped carbon dots and application of the nitrogen and phosphorus-doped carbon dots in quercetin detection, the nitrogen and phosphorus-doped fluorescent carbon dots (N, P-CDs) are successfully constructed for the first time by adopting a hydrothermal synthesis method, and the carbon dots have emission peaks at 465 nm under the excitation wavelength of 325 nm and show green fluorescence under the irradiation of an ultraviolet lamp; quinine sulfate is used as a standard reference substance, and the quantum yield is 1301%; an N, P-CDs solution is used as a probe molecule, after quercetin is added, fluorescence quenching of N, P-CDs is induced, and the concentration of quercetin and the fluorescence intensity of N, P-CDs are linearly changed, so that the method can be used for quantitative detection of quercetin. The N, P-CDs preparation method provided by the invention is simple and rapid, the product property is stable and non-toxic, the detection sensitivity on the quercetin is high, and the N, P-CDs can be used for detecting the content of the quercetin in serum.

The invention discloses a silver vanadate photocatalytic material, a preparation method thereof and an illuminating lamp. The preparation method comprises the following steps: firstly, respectively dissolving NH4VO3 and AgNO3 in deionized water, uniformly mixing by magnetic stirring, adjusting the pH value of the solution, and then carrying out hydrothermal synthesis reaction to obtain the Ag3VO4 photocatalytic material. The Ag3VO4 photocatalytic material with controllable morphology, uniform particle size and good dispersity is prepared by adopting a synthesis strategy of a one-step hydrothermal method, the performance of the photocatalyst is optimized by regulating and controlling the pH value, the raw materials and the process are simple, the conditions are easy to control, the cost is low, the photocatalytic degradation rate of the catalyst to organic pollutants is high, and the method is suitable for industrial production. The stability of a crystal structure and catalytic activity can be kept under long-term illumination, and the functional application of a photocatalytic air purification technology can be realized by integrating with an illumination lamp.

The invention relates to the technical field of nano molecular sieves, in particular to a nano FAU / EMT symbiotic molecular sieve and a preparation method thereof. The preparation method of the nano FAU / EMT symbiotic molecular sieve comprises the following steps: mixing and stirring an aluminum source, an alkali source and deionized water until the mixture is clear to form an alkaline aluminate solution, slowly adding a silicon source into the alkaline aluminate solution in batches, and continuously stirring to form uniform precursor gel; the precursor gel is subjected to aging treatment, hydrothermal crystallization treatment, centrifugal washing and drying, and the nano FAU / EMT symbiotic molecular sieve is obtained. The template-free one-step hydrothermal synthesis of the nano FAU / EMT symbiotic molecular sieve is realized. According to the method, use of an expensive and toxic organic template agent is avoided, and the preparation cost and the environmental pollution risk are remarkably reduced; meanwhile, one-step hydrothermal synthesis simplifies the technological process, improves the production efficiency and provides feasibility for industrial production.

The invention relates to the technical field of microfluidics, in particular to a carbon quantum dot hydrothermal synthesis system and method based on microfluidics thermal field equilibrium, which comprises a thermal field sensing module, an equilibrium analysis module, a thermal field coupling module, an equilibrium regulation and control module and a closed loop execution module, the thermal field sensing module is used for collecting array temperature on the surface of the micro-fluidic chip and fluid pressure data in a flow channel, and reconstructing three-dimensional temperature distribution in the micro-channel through a multi-physics field coupling algorithm to obtain a real-time thermal field state matrix. According to the invention, by constructing a multi-physical field coupling algorithm of a thermocouple array-flow resistance model-conjugate heat transfer equation, the three-dimensional temperature distribution of the fluid in the micro-channel can be inverted and reconstructed by using surface temperature and pressure data, so that a control system can pass through a chip matrix, and the temperature of the fluid in the micro-channel can be controlled. The radial temperature gradient and the axial thermal distortion in the fluid are directly sensed, the hysteresis and the error of sensor measurement are eliminated, and a real physical basis is provided for accurate temperature control.

The invention discloses a method for preparing a porous carbon / hydrotalcite-like compound adsorbent from fine coal gasification slag, which comprises the following steps: by taking the fine coal gasification slag as a raw material, sequentially carrying out alkali activation desiliconization and ion regulation, adding a pH regulator, stirring, and carrying out one-pot hydrothermal synthesis to obtain the porous carbon / hydrotalcite-like compound adsorbent. And carrying out solid-liquid separation and washing on the hydrothermal composition to obtain a solid phase, namely the porous carbon / hydrotalcite-like compound adsorbent. According to the invention, the pore structure of carbon is expanded while alkali activation desiliconization is carried out, so that the formation of porous carbon is ensured; the porous carbon / hydrotalcite-like compound adsorbent meets the requirement of forming a hydrotalcite-like compound with better crystallinity through ion regulation and control, provides an alkaline environment for synthesizing the hydrotalcite-like compound by adding a pH regulator, ensures the formation of the hydrotalcite-like compound through one-pot hydrothermal synthesis, and is obtained through solid-liquid separation and washing, the aggregation state in the hydrotalcite-like compound synthesis process is improved, and the stability and adsorption active sites of the composite adsorption material are increased.

The invention relates to the technical field of electro-catalytic materials, in particular to a preparation method of a NiFe LDH / NiFeO / NF composite catalyst. The method comprises the following steps: carrying out acetic acid solution pretreatment on a foamed nickel substrate; growing a nickel-iron precursor on the pretreated foamed nickel through the first hydrothermal reaction, and treating to obtain NiFeO / NF; and growing a nickel-iron layered double hydroxide nanosheet on the surface of the NiFeO / NF through a second hydrothermal reaction to obtain the NiFe LDH / NiFeO / NF composite catalyst. According to the preparation method of the NiFe LDH / NiFeO / NF composite catalyst provided by the invention, a NiFeO / NF matrix is prepared by a hydrothermal synthesis method, after air heat treatment, a NiFe layered double hydroxide nanosheet with a smaller size is synthesized on the surface of NiFeO / NF by adopting a secondary hydrothermal process, and finally the NiFe LDH / NiFeO / NF composite catalyst is obtained.

The invention discloses a preparation method of cellulose micron sheet powder and a high-haze transparent film thereof, which comprises the following steps: S1, crushing bamboo pulp foil to obtain a cellulose raw material; s2, placing in a sulfuric acid solution, stirring in an oil bath for hydrolysis, adding water after reaction, taking out, and placing in a polytetrafluoroethylene hydrothermal synthesis reaction kettle for auxiliary reaction to obtain a milk white suspension; s3, centrifuging and dialyzing the milk white suspension until the pH is nearly neutral; s4, performing ultrasonic treatment on a product in S3 by adopting an ultrasonic cell crusher, and performing freeze drying to obtain powdery cellulose micron sheets; according to the invention, through reasonable optimization of acidolysis and hydrothermal process parameters, the powdery cellulose micron sheet with uniform thickness and no irreversible keratinization defect is obtained, has excellent redispersibility after rehydration, can be compounded with polyvinyl alcohol to form a high-haze transparent film, and overcomes the defect that in the subsequent drying process of sulfuric acid hydrolysis of micro-nano cellulose, the film is not easy to form, and the film is not easy to form. The problems of irreversible agglomeration and poor rehydration redispersibility caused by hydrogen bond induction are solved.

The invention belongs to the technical field of energy storage materials, and particularly discloses preparation and application of a high-performance asphalt-based porous carbon material. The method comprises the following steps: pre-treating asphalt; carrying out hydrothermal synthesis on microcrystalline cellulose and phytic acid to obtain cellulose ester; the preparation method comprises the following steps: compounding humic acid, hectorite powder and cellulose ester, and freeze-drying to obtain a compound additive; carrying out microwave-hydrothermal reaction on the pretreated asphalt and a compound additive to form a precursor; and activating the precursor, carbonate and phosphate in a multi-section gradient atmosphere, and finally washing and drying to obtain the porous carbon material. According to the method, strong base etching is replaced by synergistic pore-forming and atmosphere activation of the composite additive, so that green controllable pore expansion and uniform doping of heteroatoms are realized; and a graded pore channel structure is accurately constructed through multi-section carbonization. The obtained material has a three-dimensional interpenetrating network, a high specific surface area and excellent conductivity, can effectively buffer ion embedding stress, remarkably improve electrochemical stability and inhibit volume expansion, and is suitable for lithium and sodium ion battery negative electrodes and supercapacitor electrodes.

The invention relates to the technical field of catalysts, and particularly discloses a composite catalyst for preparing acrolein through catalytic oxidation of propylene and a preparation method of the composite catalyst, the composite catalyst comprises an active component I and an active component II, and the use mass ratio of the active component I to the active component II is 1: (1-19); the active component I is bismuth tungstate microspheres obtained by a hydrothermal synthesis method, and the general formula of the active component I is BiaW1Ox; the active component II is a multi-metal oxide obtained by a coprecipitation method, and the general formula of the active component II is Mo < 12 > Bi Co < c > Ni < d > Fe < e > A < f > B < g > O < y >; the bismuth tungstate microspheres obtained by a hydrothermal synthesis method and the multi-metal oxide obtained by a coprecipitation method are mixed to obtain the composite catalyst, so that the bismuth tungstate microspheres with microsphere structures can be used as active phases of reaction, and the specific surface area and the pore volume of the composite catalyst can be increased; the catalyst is suitable for a reaction for preparing acrolein through propylene catalytic oxidation under high load.

The invention discloses tetragonal system germanium dioxide and a hydrothermal synthesis method thereof. According to the method, hexagonal crystal system germanium dioxide is taken as a raw material, a hydrothermal reaction is carried out in an acidic aqueous solution, and efficient conversion from a hexagonal crystal system to a tetragonal crystal system is realized by controlling the reaction temperature to be 120-240 DEG C, the reaction time to be 24-48 hours and the pH value to be 1-3. According to the preferable scheme, the raw materials are subjected to calcination pretreatment at the temperature of 500-600 DEG C, the yield of the tetragonal crystal phase can be remarkably increased, and the synthesis temperature can be reduced to 120 DEG C. According to the invention, stable synthesis of tetragonal system germanium dioxide is realized for the first time under the mild condition of 240 DEG C and below, and the technical problem that high-temperature transformation at 1000 DEG C or above is needed in the traditional method is solved. The tetragonal crystal system germanium dioxide prepared by the method is of a regular polyhedral structure, has the particle size of 400-500nm, and can be used as a high-efficiency catalyst for polyester synthesis. The process is energy-saving and environment-friendly, the total utilization rate of the raw materials is increased by recycling the waste liquid, and the process has remarkable industrial application value.

The invention provides a bismuth ferrite-graphite phase carbon nitride photocatalyst and a preparation method and application thereof, and relates to the technical field of photocatalysis, the preparation method comprises the following steps: dissolving a bismuth source and an iron source in a solvent, mixing with a mineralizing agent, and carrying out a hydrothermal synthesis reaction to obtain bismuth ferrite; performing first roasting treatment on the nitrogen-containing organic matter precursor to obtain graphite-phase carbon nitride; and mixing bismuth ferrite and graphite phase carbon nitride, and carrying out grinding treatment and second roasting treatment to obtain the bismuth ferrite-graphite phase carbon nitride photocatalyst. According to the preparation method, bismuth ferrite and graphite-phase carbon nitride which are prepared respectively are compounded, a Z-type heterojunction can be constructed at an interface of the bismuth ferrite and the graphite-phase carbon nitride, an internal electric field is formed, so that photo-induced electrons and holes are efficiently separated, compounding of the photo-induced electrons and the holes is effectively inhibited, and finally the oxidation-reduction capacity of the material is remarkably enhanced; therefore, the photocatalyst shows excellent photocatalytic performance, high selectivity and good cycle stability.

The application relates to a preparation method of an ordered defective indium cluster framework porous material for electrocatalytic reduction of carbon dioxide to urea, and belongs to the technical equipment field of ordered defective metal organic framework synthesis, in particular to a preparation method of an ordered defective indium cluster framework material for electrocatalytic reduction of CO2 to urea, which comprises a preparation method of five steps; through the above design, the ordered defective indium cluster framework porous material is synthesized by adopting a hydrothermal synthesis mode, taking indium trifluoromethyl sulfonate as a metal source and a square fan of in-situ self-assembly; the preparation method of the application can obtain the ordered defective indium cluster framework porous material, the obtained product indium cluster framework porous material has uniform micron-level size and excellent stability, the method used in the application is simple in operation, the obtained catalyst defect order exhibits excellent selectivity in electrocatalytic reduction of carbon dioxide to urea at a lower overpotential, which is difficult to realize by the existing metal organic framework-based catalyst.

The invention discloses preparation of composite magnetic beads and application of the composite magnetic beads in edible oil refining for the first time, FeCl3. 6H2O, polyethylene glycol 6000, sodium acetate and ethylene glycol are subjected to hydrothermal synthesis to form magnetic beads (MBs), the MBs are modified by tetraethyl orthosilicate and 3-aminopropyltriethoxysilane to obtain composite magnetic beads MBs (at) mSiO2-NH2, and the obtained composite magnetic beads are added into edible oil for adsorption refining. After adsorption is completed, the composite magnetic beads are separated from the edible oil through simple magnetic separation, and the separated composite magnetic beads can be recycled. The low temperature is controlled to be 30-40 DEG C in the whole adsorption refining process, compared with a traditional refining process, the temperature is greatly reduced, and loss of heat-sensitive substances such as vitamin E and polyphenol caused by high temperature is avoided. According to the invention, simultaneous degumming and deacidification of rapeseed oil are realized, and deacidification of cold-pressed peony seed oil can also be realized. The invention aims to provide an adsorption refining technology with triple advantages of high efficiency, green circulation and nutrition preservation, and healthy development of the grease industry is promoted.

The invention discloses a foamed nickel-based composite material based on an electro-deposition / hydrothermal synthesis method, which is characterized in that firstly, foamed nickel NF is used as a substrate, cobalt hydroxide is loaded on the surface of the NF through electro-deposition, and Co (OH) 2 / NF with a lamellar stacked flower-shaped structure is obtained; the preparation method comprises the following steps: preparing NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF, then converting the NiCo-LDH (layered double hydroxide) Co (OH) 2 / NF into ZIF-67 through an impregnation method to obtain ZIF-67 (at) Co (OH) 2 / NF with a regular dodecahedron structure, and finally, preparing NiCo-LDH (at) Co (OH) 2 / NF with a honeycomb stacked structure through a hydrothermal method. The preparation method comprises the following steps: 1, preparing foamed nickel electro-deposition cobalt hydroxide; 2, preparing the foamed nickel loaded ZIF67 and cobalt hydroxide; and 3, preparing the nickel foam loaded nickel-cobalt layered double-metal hydroxide and cobalt hydroxide. When the material is used as a supercapacitor material, the area specific capacitance is 17-18F cm <-2 > when the current density is 1mA cm <-2 >; and when the current density is 10mAcm <-2 >, 70-80% of the initial capacity is still kept after 5000 charge-discharge cycles are carried out.

The invention relates to the technical field of preparation of catalysts, in particular to a solar-driven CO2 trapping and cracking catalyst, a preparation method and application, and the solar-driven CO2 trapping and cracking catalyst comprises the following components in parts by mass: 50-70 parts of a solid metal-based carrier precursor, 10-15 parts of a metal salt solution, 5-8 parts of a modified impregnation liquid, 20-30 parts of a reaction medium and 8-12 parts of a modified doping liquid. Through the one-step hydrothermal synthesis and co-impregnation process, the preparation process is simplified, the traditional complex process of separation after CO2 capture is omitted, the comprehensive cost is reduced by more than 30%, and the traditional high-energy-consumption carbon dioxide pressure swing adsorption and temperature swing adsorption technology is completely eliminated.

The invention discloses an amphiphilic carbon-based nano oil displacement agent with a high emulsification level and a preparation method thereof, and belongs to the technical field of emulsification. The carbon-based quantum dots are synthesized by taking various small molecule compounds as raw materials through one-step hydrothermal synthesis, and then functional groups such as hydroxyl and carboxyl of the carbon-based quantum dot material are subjected to post-modification by using alkylamine, sulfanilic diazonium salt and the like, so that the hydrophilic and hydrophobic properties of the carbon-based quantum dot material are directionally regulated and controlled; therefore, the amphiphilic carbon-based nano oil displacement agent with good surface activity is prepared. The method has general adaptability to most of carbon-based quantum dot materials, and the prepared carbon-based nano oil displacement agent shows good interface performance and emulsifying performance as a surfactant. Various prepared carbon-based nano oil displacement agents show good interfacial activity and excellent emulsifying performance, and a water-oil two-phase emulsion system prepared from the carbon-based nano oil displacement agents prepared by the method is dense in emulsion, small in emulsion bubble particle size and very excellent in stability.

The invention provides a preparation method of a Mo-doped FeSe2 electrode material and application of the Mo-doped FeSe2 electrode material as a sodium-ion battery anode, and the preparation method comprises the following steps: mixing FeCl3. 6H2O, terephthalic acid and N, N-dimethylformamide, loading into a reaction kettle, and heating at high temperature to obtain an MIL-88B metal organic framework precursor; and then dispersing the MIL-88B precursor, sodium molybdate, selenium powder and hydrazine hydrate in a solvent, and doping Mo atoms into a FeSe2 electrode material through hydrothermal synthesis to obtain the Mo-FeSe2 sodium ion battery anode. According to the preparation method, Mo atoms are doped into FeSe2, so that the strength of Fe-Se bonds is enhanced, the structure collapse effect of the electrode material is effectively relieved from the structure level, an SEI film on an electrode liquid interface is compact and uniform, and the multiplying power and the cycle service life of the electrode material are effectively improved.

The invention discloses a method for detecting Escherichia coli in food by combining Fe3O4 (at) Mo-CDs nano-enzyme with an aptamer, according to the method, near-infrared light response molybdenum-doped carbon dot modified Fe3O4 (at) Mo-CDs nano-enzyme is synthesized through a hydrothermal method, the Fe3O4 (at) Mo-CDs nano-enzyme has excellent NIR enhanced peroxidase activity and magnetism, 3, 3 ', 5, 5'-tetramethyl benzidine is oxidized to generate blue oxidized TMB, and the activity and magnetism of the NIR enhanced peroxidase are improved. After the surface of the Fe3O4 (at) Mo-CDs nano-enzyme is functionalized with an escherichia coli nucleic acid aptamer, the POD-like activity of the Fe3O4 (at) Mo-CDs nano-enzyme is inhibited, when Escherichia coli exists, the Fe3O4 (at) Mo-CDs nano-enzyme can be selectively combined with E.coli, the POD-like activity of the nano-enzyme is further inhibited, when the Fe3O4 (at) Mo-CDs nano-enzyme is used for detecting the E.coli in samples such as fruit juice and cakes, the detection limit is as low as 0.767 CFU / mL, and the Fe3O4 (at) Mo-CDs nano-enzyme has relatively high reliability and accuracy and can be widely applied to detection of E.coli. According to the invention, magnetic targeting separation and visual detection of E.coli are realized.

The invention provides a carbon nitride-Pt sulfur cobalt zinc photocatalytic hydrogen production material as well as a preparation method and application thereof, and belongs to the technical field of nano material preparation and photocatalytic application. The preparation method comprises the following steps: firstly, respectively preparing g-C3N4 powder and ZnCo2S4 nanoparticles; pt is loaded on the surface of g-C3N4 in situ through a photodeposition method, and g-C3N4-Pt is obtained; finally, ZnCo2S4 is added into the g-C3N4-Pt dispersion liquid, and the photocatalytic hydrogen production material is obtained. According to the preparation method of the photocatalytic hydrogen production material, hydrothermal synthesis, photodeposition and solvent evaporation technologies are combined, metal Pt is introduced to serve as an electron transmission bridge, tight interface contact and an efficient charge transmission channel are constructed between g-C3N4 and ZnCo2S4, separation of photon-generated carriers is remarkably promoted through the formed composite photocatalyst, and the photocatalytic hydrogen production material is prepared. The photocatalyst has an excellent effect on hydrogen production through photocatalytic water decomposition, and is high in cycling stability, environment-friendly and pollution-free.

The invention discloses a photocatalytic synthesis method of diethyl disulfide, and relates to the technical field of organic synthesis. The preparation method specifically comprises the following steps: mixing Co (NO3) 2.6 H2O and Ni (NO3) 2.6 H2O, and adding methanol to obtain a solution A; 2-methylimidazole and methyl alcohol are mixed, and a solution B is obtained; mixing the solution A and the solution B to obtain a zeolite imidazole framework material; selenium powder and the zeolite imidazole framework material are mixed and calcined, and a NiCoSe2 material is obtained; the preparation method comprises the following steps: mixing a NiCoSe2 material, ZnCl2, InCl3 and C2H5NS, adding an ethanol water solution, and carrying out microwave hydrothermal synthesis to obtain a NiCoSe2-coated ZnIn2S4 photocatalyst; the NiCoSe2-coated ZnIn2S4 photocatalyst and ethanethiol are subjected to a photocatalytic reaction under N2 atmosphere protection and visible light irradiation, and diethyl disulfide and hydrogen are generated. The method is mild in reaction condition and high in product stability.

The invention relates to the field of packaging bags, and discloses an antibacterial composite bag for food and a preparation method thereof, the antibacterial composite bag for food comprises low density polyethylene, a functional additive, modified tetrapod-like zinc oxide whiskers and a lubricant; according to the functional additive, lignin nanoparticles are used as a core, polydopamine is used as a shell, graphene oxide is assembled to prepare a composite material, and gamma-aminopropyltriethoxysilane is used for amination grafting of the composite material. The nano cuprous oxide is loaded on the aminated composite material by adopting a one-step reduction method and reacts with glycidyl dodecyl dimethyl ammonium chloride; the modified tetrapod-like zinc oxide whisker is prepared by coating the surface of the tetrapod-like zinc oxide whisker with silver-doped zinc oxide through a hydrothermal synthesis method, and by adding the functional additive and the modified tetrapod-like zinc oxide whisker, the matrix material is endowed with good mechanical property, antibacterial property, ultraviolet resistance, heat resistance and flame retardance.

The application discloses a silicon-doped modified ZnSn(OH)6 photocatalyst and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. The preparation method comprises the following steps: (1) mixing Zn(Ac)2.2H2O solution, SnCl4.5H2O solution, NaOH solution, Na2SiO3.9H2O, methyl cellulose solution and distilled water to obtain a mixed solution; and (2) heating the mixed solution to synthesize the silicon-doped modified ZnSn(OH)6 photocatalyst. The product is prepared by using a hydrothermal synthesis method, the method can easily obtain a material with high crystallinity, the morphology and size of the material can be better controlled, the method is easy to operate, and the prepared silicon-doped modified photocatalyst has the characteristics of stable activity, fast carrier migration rate and high separation efficiency, and has excellent catalytic performance on methylbenzene volatile organic pollutants, and has a wide application prospect in the field of environmental pollution control.

The invention belongs to the technical field of pyruvic acid biological detection, and relates to a pyruvic acid sensing chip of a Prussian blue nano frame / gold nano composite material. The method comprises the following steps: adding soluble metal salt containing ferricyanide ions into water; the method comprises the following steps: adding soluble ferric salt and a complexing agent into water, mixing, and carrying out hydrothermal synthesis reaction to obtain PB powder; adding PB powder into ethanol, adding ammonia water for reaction, mixing with conductive carbon paste to obtain nano printing paste, and printing the printing paste on a substrate to form a working electrode; the preparation method comprises the following steps: preparing a working electrode, drying the working electrode, placing the working electrode in a chloroauric acid solution for constant potential electrodeposition, mixing a PBS solution of pyruvate oxidase, a polylysine solution and an EDC solution, dropwise adding the mixture on the surface of the working electrode, and drying to obtain the pyruvic acid sensing chip. The obtained pyruvic acid sensor can reach the sensitivity of 50.42 [mu] A.mM <-1 >. Cm <-2 >, and is simple in preparation process and relatively low in cost.

The invention discloses a preparation method of graphene super-energy zinc oxide, and relates to the technical field of inorganic synthesis and nano material preparation. Comprising the steps of hydrothermal synthesis in a polar solvent system, wet precipitation, ultrasonic treatment and high-temperature roasting and ball milling. A comb-shaped functional additive is matched with an auxiliary agent to regulate and control a solvent environment, and ZnO with controllable morphology such as hexagonal prism / nanorod / nanowire is generated under a hydrothermal condition. And mixing the graphene with calcium carbonate and graphene to obtain the graphene super-energy zinc oxide. The rubber composition has excellent processability in the processing process, can effectively improve the production efficiency and ensure the stability of the product quality, and is suitable for producing and processing various rubber products, such as tires, rubber tubes, adhesive tapes, rubber shoes and the like.

The invention discloses a vanadium oxide nanosheet aggregate self-supporting electrode material and a preparation method thereof.The preparation method comprises the steps that 1, 0.5-1 g of ammonium metavanadate, 0.5-1 mg of oxalic acid and 0.1-0.4 g of mesoporous molecular sieve MCM-48 are taken and added into 20-40 mL of ultrapure water, full stirring is conducted, and a mixed solution is obtained; step 2, putting pretreated foamed nickel into the mixed solution in the step 1, putting the mixed solution into a reaction kettle, putting the reaction kettle into a drying oven, and carrying out hydrothermal reaction at 140-180 DEG C; 3, after the reaction is finished, the reaction kettle is naturally cooled to the room temperature, the foamed nickel is taken out, the foamed nickel is subjected to water washing and alcohol washing alternately, the foamed nickel is placed in air to be naturally aired after washing, and the uniform vanadium oxide nanosheets are obtained. The vanadium oxide nanosheet aggregate self-supporting electrode material is prepared by adopting a low-temperature one-step hydrothermal synthesis method, the vanadium oxide nanosheet aggregate self-supporting electrode material has a unique microstructure, namely a nanosheet with the thickness of 100-200nm, and the structure can greatly improve the electrochemical performance and catalytic performance of vanadium oxide serving as an electrocatalyst.

The application discloses a preparation method of a mesoporous silicon-based composite material with phosphotungstic acid and titanium oxide simultaneously supported, and belongs to the technical field of catalytic material preparation. The method aims to solve the problems of easy aggregation of active components, easy damage of channel order and complex preparation process in the prior art. The method is characterized by the following steps: through a one-step hydrothermal synthesis strategy, a triblock copolymer is used as a structure directing agent, an alcohol solution of a titanium source precursor, a silicon source precursor and a Keggin type phosphotungstic acid is simultaneously added in an acid system, and then the mesoporous silicon-based composite material is prepared through hydrothermal crystallization, washing, drying and calcination. The method is simple in process and controllable in operation, and the obtained material has the following advantages: two-dimensional hexagonal ordered mesoporous structure, large specific surface area, high dispersion of titanium and phosphotungstic acid, intact Keggin structure, good double-acid-site synergistic catalytic effect, and suitability for acid catalytic reactions, especially in the field of biomass conversion.