125results about How to "The synthetic method is green and environmentally friendly" patented technology

The invention relates to a carbon dioxide electrochemical reduction catalyst as well as a preparation method and an application thereof. The carbon dioxide electrochemical reduction catalyst comprises tin dioxide nanoflower, wherein the tin dioxide nanoflower is synthesized through hydrothermal reaction and comprises the synthesis raw materials including 0.1-0.5M of tin dioxide, 1-5M of trisodium citrate mixed solution and 0.1-0.5M of sodium hydroxide. The carbon dioxide electrochemical reduction catalyst is applied to a carbon dioxide electrochemical reduction catalyst gas diffusion electrode. The carbon dioxide electrochemical reduction catalyst has the advantages that the specific surface area of the catalyst is enlarged, the electrochemical reduction catalytic activity of the catalyst for carbon dioxide reduction is improved, the hydrogen evolution reaction is effectively inhibited, and the selectivity of formic acid in a product is improved.

The invention provides a preparation method and use of a Bi2O3/Bi2O4 phase heterojunction photocatalyst. The preparation method comprises the following steps: firstly, mixing 2.8 g of bismuth salt with 0-1.87 g of alkali uniformly to prepare a paste; then, placing a mixture into a muffle furnace and calcining at 100-450 DEG C for 0.5-4.0 h; washing a calcined substance with deionized water; and drying at 60 DEG C to obtain earthy yellow to reddish brown solids which are the Bi2O3/Bi2O4 heterojunction photocatalyst. The Bi2O3/Bi2O4 phase heterojunction photocatalyst prepared in the invention isused for degrading organic pollutants in water, and has higher visible light catalyzing activity than a commercial Bi2O3 photocatalyst.

The invention provides an alpha/beta-Bi2O3 phase heterojunction photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: firstly dissolving 2-4mmol of a bismuth source material in 70mL of a reductive solvent, magnetically stirring for 30 minutes under the room temperature, then adding 0-2.0mL of aniline into the solution, and continuing to stir for 10 minutes; transferring the mixed solution into a reactor, putting the mixed solution in a drying oven for carrying out solvothermal reaction for 8-12 hours at the temperature of 150-180 DEG C to obtain a bismuth-based precursor; washing, drying and grinding the precursor, putting the precursor in a muffle furnace for calcining for 0.5-2.0 hours at the temperature of 300 DEG C to obtain yellowish green powder which is the alpha/beta-Bi2O3 phase heterojunction photocatalyst. The prepared alpha/beta-Bi2O3 phase heterojunction photocatalyst is used for degrading organic pollutants in water; compared with commercial TiO2 (P25), pure-phase alpha-Bi2O3 and pure-phase beta-Bi2O3 photocatalysts, the alpha/beta-bismuth oxide phase heterojunction photocatalyst has higher visible-light catalytic activity.

The invention discloses an oxygen evolution reaction (OER) catalyst based on a composite structure of MXene and metal-organic frameworks (MOFs) and a synthesis method of the catalyst and belongs to the fields of nano materials, energy and catalysis. The catalyst is prepared from MXene two-dimensional nanosheets uniformly loaded with MOFs nanoparticles on the surfaces, and has a two-dimensional structure. The preparation method comprises the following steps: dissolving and uniformly mixing MXene, metal salt, an organic ligand and an acid-binding agent, then centrifuging, washing, and carrying out vacuum drying to obtain an electrocatalyst with a two-dimensional nanostructure with finely-adjustable structure and components. The oxygen evolution reaction catalyst and the synthesis method of the catalyst disclosed by the invention have the beneficial effects that the basic difficulty of failed catalytic property of an oxygen evolution reaction due to poor conductivity and stability of theMOFs can be effectively overcome; the obtained oxygen catalyst shows excellent catalytic activity and stability to the oxygen evolution reaction in alkaline electrolyte and lays a foundation for wideapplication of new-energy technologies such as fuel cells, metal-air batteries and electrolytic water.

The invention discloses self-healing hydrogel capable of promoting wound healing and cancer therapy and preparation method thereof. The self-healing hydrogel is FCB hydrogel which is prepared by Schiff base reaction among a polyether-cationic polymer water solution with a mass concentration as 8% to 50%, a polyether-p-hydroxy benzaldehyde water solution with a mass concentration as 10% to 40% anda dopamine modified biological active inorganic material water solution with a mass concentration as 2% to 10%, the water solutions are mixed according to a volume ratio of (22 to 28) to (7 to 10) to(4 to 10), the F is polyether-cationic polymer, the C is polyether-p-hydroxy benzaldehyde, and the B is a dopamine modified biological active inorganic material. The self-healing hydrogel has good biological compatibility, better photo-thermal character and stronger antibacterial property; under laser radiation, the self-healing hydrogel can effectively inhibit animal cancer growth; furthermore, the self-healing hydrogel can promote mouse skin damage repair. The preparation method has the advantages of simpleness, no organic solvent residue, environment-friendly synthesizing method, convenience in operation and low raw material cost.

The invention provides a method for preparing an aluminum phosphate molecular screen in a eutectic mixture, and belongs to the field of inorganic chemical synthesis. In particular, the invention relates to a method for an aluminum phosphate molecular screen by the eutectic mixture as a reaction solvent and a template. The method is characterized by using the eutectic mixture prepared by combining alcohol and quaternary ammonium salt as the reaction solvent and the template to prepare the aluminum phosphate molecular screen. In the ion thermal reaction, the eutectic mixture has proper acidity and alkaline, the alcohol organic matters are not decomposed to release extra organic amine in the crystallization reaction process when being heated, and the quaternary ammonium salt in the system can fully complete the structure guide action. Compared with the imidazole ionic liquid, the used eutectic mixture material has the advantages of low price, easy purchase and preparation, hard deliquescence and convenient use.

The invention discloses a methylbenzene gas sensor based on an alpha-Fe2O3/SnO2 heterostructure nanowire array and a preparation method of the methylbenzene gas sensor, and belongs to the technical field of gas sensors. The device is of a flat plate structure, and is composed of two separated copper-gold alloy probes (serving as test electrodes), a sensitive material thin film growing on a Pt-plated silicon wafer, and a mini-type high-temperature ceramic heating piece on the back face of the silicon wafer. The sensor has the advantages of being high in integration level, simple in structure, low in price, small in size, firm, durable and capable of being produced on a large scale. In addition, the test result of the gas-sensitive characteristic shows that the sensor can detect methylbenzene at low working temperature and has extremely-good long-term stability, and therefore the methylbenzene gas sensor can have important application prospects on the aspects of methylbenzene leakage detecting and alarming in industrial production.

The invention discloses an ethanol gas sensor based on a ZnO hollow flower ball and CdO nano-particle composite nanomaterial and a preparation method of the ethanol gas sensor and belongs to the technical field of oxide semiconductor gas sensors. The method comprises the steps of firstly taking zinc acetate dihydrate, glycine, sodium sulfate decahydrate and sodium hydroxide as starting raw materials, and a mixed solution of water and ethanol as a solvent and successfully preparing a ZnO hollow flower ball precursor by using a hydrothermal method; and burning in air to obtain ZnO hollow flower ball powder; and taking the ZnO hollow flower ball powder, cadimium nitrate tetrahydrate and thiourea as the starting raw materials, and a mixed solution of dimethylformamide (DMF) and isopropyl alcohol as the solvent, compounding CdO nano-particles on the ZnO hollow flower balls by using the hydrothermal method and then burning in air to obtain the ZnO hollow flower ball and CdO nano-particle composite nanomaterial. The defect that two materials are relatively poor in gas-sensing characteristics is overcome, and improvement of the detection sensitivity of an ethanol gas and reduction of a lower detection limit are achieved.

The invention discloses nano linear calcium titanate and a synthesis method thereof. The synthesis method for the nano linear calcium titanate comprises the following steps of: 1) dispersing titanium dioxide in a strong alkali solution, and performing a hydro-thermal reaction with stirring to obtain a white deposit; 2) washing the white deposit by using water until the white deposit is neutral or weakly alkaline, dispersing the white deposit in a soluble calcium salt solution, controlling the temperature and the pH value of the system, and performing ion exchange reaction to obtain a calcium titanate deposit; and 3) performing centrifugal washing on the calcium titanate deposit until the calcium titanate deposit is neutral, and drying and baking the calcium titanate deposit to obtain the nano linear calcium titanate. The synthesis method for the nano linear calcium titanate is mild in reaction condition, simple in operation, rich in raw material source and low in cost, so that the synthesis method is suitable for mass production; and the synthesized nano linear calcium titanate is a solid alkali with a large specific area, has high ecological biocompatibility, and is expected to be applied in the fields of heavy metal ion contaminated waste water purification, ester exchange reaction catalysis, sclerous tissue repair and replacement and the like.

The invention relates to the technical field of biology, in particular to a method for biosynthesizing nano-silver through photoinduction of imperata leaf extract. The method comprises the following steps: 1) picked imperata leaves are cleaned, dried and grinded to powder; ultrapure water is added in the powder for oscillating, extracting and centrifugating to obtain supernatant; and the supernatant is frozen and dried to obtain the imperata leaf extract; and 2) the imperata leaf extract in the step 1) is taken as a reaction matrix; AgNO3 solution is added, so that the concentration of the reaction matrix in obtained mixed solution is 10-50 mg/mL, and the concentration of AgNO3 is 1-3 mM; and nano-silver particles are prepared through reaction under sunlight irradiation or LED lamp irradiation. The biosynthesizing method is safe, environment-friendly, wide in synthetic material source and fast in synthesizing speed, can finish the reaction within 90-120 minutes, and is a green, safe and efficient biosynthesizing method.

The invention discloses a tin dioxide/nickel ferrite/ graphene composite material and a preparation method thereof. The composite material is compounded from tin dioxide, nickel ferrite and graphene, wherein the tin dioxide accounts for 10-70wt% of the composite material by mass, and the graphene accounts for 25-30wt% of the composite material by mass. Through X-ray diffraction and transmission electron microscope technical analysis, the composite material contains nickel ferrite and tin dioxide particles uniformly dispersed on graphene sheets; observed from a CV curve, with the increase of the mass of the doped tin dioxide, the tin dioxide gradually participates in electrochemical reaction, thereby greatly improving the lithium storage property of the composite material; discovered by a cycle test, the composite material has preferable cycle performance and higher stability; and under the current density of 0.2A g<-1>, the electrode material can keep the specific capacity of 500-700mAh g<-1> after 50 cycles, and the specific capacity is 50-80% of the specific capacity of the first discharge.

The invention relates to a synthesis method of environment-friendly p-methyl anisole. The method includes: taking p-cresol as the raw material, using a polar solvent like water as the solvent, adopting an alkaline substance Y type zeolite as the catalyst, and adding a proper surfactant Turkey red oil as the emulsifier, and under a 130-180DEG C temperature range and other specific conditions, using environment-friendly dimethyl carbonate (DMC) as the methylation raw material to prepare p-methyl anisole. The yield is up to 96% or above, and the final product purity is up to 99% or more.

The invention provides a high-brightness full-color-emitting copper cluster assembly fluorescent material which controls a light color to cover the whole visible light region from 490 nm to 670 nm by using different reaction solvents, a preparation method for the fluorescent material, and application of the fluorescent material to white LED illumination devices, belonging to the technical field of preparation of full-color-emitting metal cluster assemblies. According to the invention, a colloidal solution one-pot method is employed; aromatic and aliphatic mercapto groups are used for wrapping ligand; and the varieties of the reaction solvents are changed and stirring at room temperature is carried out so as to prepare the stable copper-cluster-assembled full-color-emitting two-dimensional assembly fluorescent material. The light color of the prepared fluorescent material is continuously adjustable in a range of 490 to 670 nm. The preparation method for the assembly fluorescent material is simple, fast, safe, pollution-free and suitable for batch production; in particular, the light color is easy to adjust and can cover the whole visible light region; and the prepared assembly fluorescent material has high brightness and good stability and is free of fluorescence quenching or energy transfer during premixing of white light, and thus, the assembly fluorescent material is applicable to the field of high-performance white LED illumination.

The invention provides a method for preparing cefuroxime acid. The method is characterized by comprising the following steps: (1) mixing deammonized formyl cefuroxime in liquid ester, adding a strong amino carbamylation reagent sulfonylisocynate, and performing a temperature-controlled reaction; (2) adding purified water after the reaction is completed, and performing hydrolysis; (3) adding the liquid ester after hydrolysis is completed, adjusting the pH value to be 1.9-2.0 by using hydrochloric acid, standing for layering, and performing vacuum concentration on an organic layer so as to obtain an organic layer concentrated solution; (4) adding purified water into the organic layer concentrated solution, performing crystallization, and filtering so as to obtain cefuroxime acid, wherein the liquid ester used in the step (1) and the step (3) is selected from methyl acetate, acetic ether, n-butyl acetate, methyl formate, ethyl formate and propyl formate. The method for preparing cefuroxime acid, which is provided by the invention, is green and environmental-friendly, low in cost, high in yield and good in quality.

The invention discloses a vinyl bridged covalent organic framework material based on 2, 4, 6-trimethylpyridine and a preparation method thereof, and relates to the technical field of covalent organic framework materials (COFs for short), the covalent organic framework material is prepared by using 2, 4, 6-trimethylpyridine as a core monomer, has high crystallinity, and can be used as a covalent organic framework material. The COFs-TMP-DFB/COF-TMP-TFPT copolymer has a fully conjugated frame structure with uniform hexagonal pore channels and rich pyridine nitrogen sites, and comprises two types of COFs which are respectively named as COF-TMP-DFB and COF-TMP-TFPT. The invention also discloses a preparation method of the covalent organic framework material, in the preparation process, 2, 4, 6-trimethylpyridine is directly used as a core monomer for the first time, and vinyl-bridged two-dimensional COFs are synthesized under the catalysis of acetic acid, acetic anhydride and a mixed system. The COFs prepared by the invention has good chemical stability, high specific surface area, a large number of pyridine sites and semiconductor activity, and can efficiently catalyze acetylation of salicylic acid in the presence of acetic anhydride to generate acetylsalicylic acid.

The invention provides a precious metal-modified carbide catalyst for preparation of hydrogen peroxide, and a preparation method and application thereof. The carbide is molybdenum carbide or tungstencarbide, wherein the molybdenum carbide is Mo2C and/or MoC, and the tungsten carbide is W2C and/or WC; the carbide is used as a carrier of the catalyst; and precious metal, which is one or more selected from a group consisting of metal palladium, metal platinum or metal gold, is used as an active component of the catalyst. The preparation method for the catalyst is an impregnation method, a coprecipitation method, a deposition-precipitation method or a sol-gel method. The invention also provides the application of the catalyst to direct synthesis of hydrogen peroxide from oxyhydrogen. The catalyst integrates the characteristics of both the precious metal and the carbide, especially the precious metal-like properties of molybdenum carbide and tungsten carbide, and the carbide is used for catalytic preparation of hydrogen peroxide, so the loading amount of the precious metal in the catalyst is reduced. The preparation method of the invention is simple and easy to implement, green, safe and non-toxic, and better meets the requirements of sustainable development.

The invention relates to a two-dimensional MXene-inorganic-organic hybrid multifunctional hydrogel for promoting wound healing of infectious diabetes mellitus and a preparation method thereof, the two-dimensional MXene-inorganic-organic hybrid multifunctional hydrogel is a polyether-p-hydroxybenzaldehyde aqueous solution, a branched cationic polymer aqueous solution, a 3, 3 '-dihydroxybenzaldehyde aqueous solution, a cationic polymer aqueous solution, a cationic polymer aqueous solution, a cationic polymer aqueous solution, a cationic polymer aqueous solution and a water solution. The preparation method comprises the following steps: mixing a 3, 3 '-dithiobis (propionyl hydrazide) (DTPH) aqueous solution and a dopamine modified MXene-bioactive inorganic material aqueous solution according to a volume ratio of (14-18): (1-6): (1-4): (1-4), and carrying out a Schiff base reaction to obtain the FGDM hydrogel. The FGDM hydrogel is injectable, self-healing and conductive, has temperature and oxidation reduction dual responsiveness, ROS (reactive oxygen species) removal capability, rapid hemostasis capability, good biocompatibility, relatively strong tissue adhesion and antibacterial property, and can promote the repair of infectious skin wounds of diabetic mice. The preparation method is simple, free of organic solvent residues, environment-friendly, convenient to operate and low in raw material cost.

The invention provides a preparation method and application of a gold-platinum composite nanometer diagnosis and treatment agent, and relates to a method for obtaining Au2Pt-PEG-PS (PS: photosensitizer) through the steps of synthesizing Au2Pt nanometer particles by using L-proline as a chelating agent and L-ascorbic acid as a reducing agent and performing post modification, and an application of the Au2Pt-PEG-PS (PS: photosensitizer). The Au2Pt-PEG-PS nanometer particles have catalase activity and peroxidase activity, and can react with hydrogen peroxide (H2O2) overexpressed in tumors under the weak acid condition to produce oxygen (O2) and high-toxicity active oxygen hydroxyl radicals (.OH) in situ, so that the effects of overcoming anoxia, strengthening light power effects and killing cancer cells can be achieved. Au2Pt alloy further can realize multimode imaging of CT imaging, photoacoustic imaging, photothermal imaging and the like at the same time, and united treatment and diagnosis and treatment integration are realized.

The invention relates to a method for synthesizing niobate sheet-shaped formwork powder. The method comprises the following steps: (1) preparing niobate precursor solution; (2) placing the niobate precursor solution in a high-pressure reaction container, reacting for 1-24 h at 30-200 DEG C, performing cooling and filtration, washing and drying a precipitated product, and obtaining the niobate sheet-shaped formwork powder. According to the synthesizing method, niobate crystalline hydrate is obtained through hydrothermal synthesis at the temperature lower than the temperature for conventional hydrothermal reaction (even at the ultralow temperature close to room temperature) and serves as the formwork powder and is introduced to the field of lead-free piezoelectric materials. Due to the fact that the niobate sheet-shaped formwork powder is simple, clean and environmentally friendly in the manufacturing process, the experimental cost is effectively reduced, and the mass production is facilitated.

The invention discloses a solvothermal assisted preparation method of LiFePO4/C multistage composite microspheres and belongs to the technical field of electrochemical energy storage materials. The method is characterized by taking tervalent Fe3<+> as an iron source, carrying out in-situ synthesis of resorcinol-formaldehyde resin (RF) surface modified LiFePO4OH multistage composite microspheres LiFePO4OH/RF through a one-step mixed solvothermal method; and further converting the composite microspheres into LiFePO4/C multistage composite microspheres through high-temperature carbon thermal reduction treatment under the protective atmosphere. The compaction density of LiFePO4/C reaches up to 1.3g/cm<3>; meanwhile, nanoscale primary particles ensure sufficient electrode/electrolyte active contact area, so that the material shows excellent electrochemical lithium storage performance and has a potential application prospect in the field of high-energy/power lithium ion batteries; the preparation process is free of additional introduction of carbon source or treatment of grinding and mixing; the method is an economical, efficient and environment-friendly synthesis method; the large-scale commercial production is expected to be achieved.

The invention relates to a method for enhancing the fluorescence intensity of a copper nano-cluster. The method comprises: synthesizing copper nano-cluster powder, and then generating a composite material of the copper nano-cluster and a prussian blue analogue in situ from the copper nano-cluster powder, a transition metal salt solution and a transition metal cyanide. According to the invention, the copper nano-cluster and the prussian blue analogue are mutually combined to form the composite material of the copper nano-cluster and the prussian blue analogue, so that the the fluorescence intensity of the copper nanocluster is enhanced due to the confinement effect of the prussian blue analogue, and in the composite material, the copper nano-cluster is still kept in a dispersed state.