67results about How to "Synthetic method green" patented technology

The invention discloses a preparation method of magnetic/gold nano particles. The preparation method comprises the following steps: firstly adopting a co-precipitation method to prepare the magnetic Fe3O4 nano particles; polymerizing the dopamine in-situ on the surfaces of the magnetic particles to obtain Fe3O4 nano particles modified by the poly dopamine; introducing polyphenol and amino groups to the surfaces of the Fe3O4 nano particles; absorbing the nano gold seeds on the surfaces of the modified magnetic particles through the static action; adopting the nano gold which is absorbed on the surfaces of the magnetic particles as the seed, adopting the polyphenol on the surfaces of the magnetic particles as a reducing agent, gradually adding the chloroauric acid liquid to gradually produce the gold layers on the surfaces of the magnetic particles to obtain the core-shell magnetic/gold nano particles. The nano particles have good water dispersion and strong magnetic respond performance. The diameters of the nano particles are 30-100 nanometers, the saturation magnetization is 30.1-38.7emu/g, and the nano particles are superparamagnetic. The nano particles have wide application prospect on the fields of targeted drug controlled release, thermal therapy, separation of protein and enzyme, etc.

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 discloses a graphene composite material, in particular a CoO and graphene composite material. The invention also relates to a preparation method of the graphene composite material and application of the graphene composite material in a lithium-ion battery. The preparation method comprises the steps of performing low-temperature recrystallization on cobalt acetate tetrahydrate, compositing the recrystallized cobalt acetate tetrahydrate and graphene oxide to obtain a precursor, and performing low-temperature annealing on the precursor under a high vacuum environment to obtain two-dimensional nano crystalline CoO-graphene composite material, wherein single-layer graphene with the thickness of 1-50 micrometers is taken as a carrier frame, and CoO nanocrystals with the average particle diameter of 2-20 nm are uniformly embedded in the upper and lower surfaces of the single-layer graphene. The prepared nano crystalline CoO-graphene composite material can be used as the negative electrode of a lithium-ion battery to effectively improve the capacitance of the lithium-ion battery; the preparation method is simple, the preparation period is short, the preparation efficiency is high, no toxic effect exists, the environment pollution is avoided, and the potential safety hazard is reduced.

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 provides a synthetic method for preparing alpha, beta-unsaturated ketone, and relates to the technical field of medicines, pesticides, spices and the like. The synthetic method is characterized in that under the catalysis of calcium hydroxide, in a low-concentration alcohol solution, the alpha, beta-unsaturated ketone is directly synthesized by aldehyde ketone through one-step aldol condensation. The calcium hydroxide as a catalyst used in the method is cheap and rich, and after the completion of the reaction, carbon dioxide can be introduced to remove calcium hydroxide. As the method uses the low-concentration alcohol solution, cleanness and environmental protection are achieved. Therefore, the synthetic method is eco-friendly, small in equipment corrosion, durable and more suitable for industrial production.

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 a preparation method of an indium antimonide nanocrystal, belonging to the technical field of a composite nanocrystal material. The product of the preparation method is the indium antimonide nanocrystal. The preparation method of the indium antimonide nanocrystal comprises steps of: mixing Sb2O3, In(NO3)3.9/2H2O, PEG200 (polyethylene glycol) with ethanediol in a 250ml three-necked flask, wherein the mixture is taken as growth solution; dissolving NaBH4 into ethidene diamine to be taken as storage solution; performing the oil bath on the growth solution until the temperature of the solution is 140 DEG C under the protective atmosphere of the nitrogen, and keeping the magnetic stirring for 30 minutes; adjusting the oil bath temperature at reaction temperature (120 DEG C-180 DEG C); fast injecting the storage solution into the growth solution (-2S) by a needle cylinder, and keeping the oil bath temperature and the magnetic stirring; sampling reaction solution within the reaction time from 5 minutes to 5 hours; and adding the alcohol with proper amount into the sampled reaction solution, and centrifuging for 20 minutes at the rotation speed of 15000rpm to separate the product (InSb). The preparation method is a liquid phase preparation method for preparing the InSb nanocrystal at a lower temperature (120-180 DEG C), wherein the method is high-efficiency, low-priced, free of catalytic agent and relatively safe; the prepared product is stable in property, and even in particle; and the preparation method can be used for providing the indium antimonide nanocrystal which is suitable for a high-speed electronic component, a magnetic component, and a far infrared-waveband photoelectric component.

The invention relates to a preparation method of a glucose sensor based on a composite material, which belongs to the technical field of electrochemical analysis and detection. Core-shell Fe3O4@Au composite particles are prepared by adopting casein as a stabilizer and a reducing agent through a chemical reduction method, and the preparation method has the advantages of simplicity in preparation, easily available raw materials, good biological compatibility and favorability for fixing biological enzyme; then glucose oxidase is fixed on the surface of the core-shell Fe3O4.Au composite particles to modify an electrode so as to prepare the Fe3O4@Au glucose biological sensor. The synthesis method is simple, low in cost and pollution-free. When being used for detecting the glucose, the sensor is short in response time, wide in linear range, low in detection limit, high in sensitivity and good in selectivity. The sensor is excellent in reproducibility, good in interference resistance and good in long-term stability.

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 relates to a preparation method of a four-position substituted chiral spirocyclic aminophosphine ligand on a pyridine ring and an application thereof. The four-position substituted chiral spirocyclic aminophosphine ligand on the pyridine ring comprises a compound shown in a formula 1, or a racemate or an optical isomer thereof, or a catalytically acceptable salt thereof, and is characterized by comprising a chiral spiroindane skeleton and a pyridyl group. The four-position substituted chiral spirocyclic aminophosphine ligand on the pyridine ring can be synthesized by using a 7-diaryl/alkylphosphine-7'-amino-1 and 1'- spiroindane compound comprising a spirocyclic skeleton as chiral original raw materials. After the four-position substituted chiral spirocyclic aminophosphine ligand on a pyridine ring and the transition metal (iridium) salt form a complex, the complex can be used for catalyzing asymmetric catalytic hydrogenation of alpha-aromatic amine to substitute lactonecompounds. By the adoption of the preparation method of the four-position substituted chiral spirocyclic aminophosphine ligand on the pyridine ring and the application thereof, extremely high catalytic activity (TON up to 5000) and enantioselectivity (up to 98% ee) are achieved, and practical value is achieved.

The invention relates to a synthetic method of 3-seleno indoles. An isonitrile compound shown as a formula (I), elemental selenium shown as a formula (II), an indole compound shown as a formula (III)and a secondary amine shown as a formula (IV) are reacted at 25-70 DEG C under functions of an alkali in an air atmosphere by adopting an organic solvent as a reaction medium to obtain one of the 3-seleno indoles shown as a formula (V). The reaction route is shown in the specification, wherein R1 is selected from nitro, cyano, acetyl, acylamino, alkyl, alkoxy, an ester group, trifluoromethyl or halogen, R2 is selected from hydrogen, phenyl, substituted phenyl or alkyl, and R3, R4 and R5 are independently selected from hydrogen, phenyl, alkyl, cyano, nitro, an ester group, alkoxy or halogen. The secondary amine shown as the formula (IV) is selected from noncyclic aliphatic secondary amines, cyclic aliphatic secondary amines or aromatic secondary amines. Reaction conditions of the method aremild and the method is environmentally-friendly.

The invention relates to a synthesis method for a polybrominated benzene [1.3] oxazine derivative, comprising the following steps of: carrying out reaction of compounds shown in formula (I) and N-bromo-succinimide (NBS) in a solvent at 25-100 DEG C to obtain the polybrominated benzene [1.3] oxazine derivative shown in formula (II) after the reaction is completed. The compounds shown in the formula(I) and the formula (II) are as shown in the description, wherein R is chosen from phenyl, substituted phenyl, C1-C5 alkyl (preferably isopropyl) or thiophene. The synthesis method has the advantagesof being mild in reaction conditions, environment-friendly, simple in operation and capable to obtain polybrominated benzene oxazine compounds which cannot be obtained by conventional methods throughone pot multi-step reaction.

The invention discloses a preparation method of a GO/MoS2 electrode for removing lead ions in water by an electrochemical method. The invention relates to the field of materials, and aims to provide amethod for removing lead from a GO/MoS2 composite material by capacitance deionization, which combines graphene with MoS2 by a hydrothermal method and is applied to capacitance removal of Pb (II) forthe first time. By adding graphene, stacking of MoS2 is avoided, the contact surface area of MoS2 and lead ions is increased, MoS2 with high intrinsic ionic conductivity can provide higher specific capacitance, and a good effect on lead ion removal is achieved. The synthesis method has the advantages of simplicity, greenness and high efficiency, and is applied to the field of electrodes.

The invention relates to a synthesis method of a GQDs modified ZnO composite nanostructure gas sensitive material for detecting dimethylamine gas. The method comprises the following steps: adding GQDsin different proportions into ZnO nanosheets, and synthesizing to obtain the GQDs-modified ZnO composite nanostructure gas sensitive material, namely GQDs-ZnO. The GQDs-modified ZnO composite nanostructure gas sensitive material provided by the invention has an appropriate porous structure and a relatively high specific surface area, and the synthesis method is green, simple and safe, relativelysimple and convenient in raw material acquisition and relatively high in practical degree. When being used as a gas sensitive material, the invention shows excellent gas sensitive performance at the working temperature of 160 DEG C, shows relatively high sensitivity, relatively high linearity, excellent selectivity and relatively good repeatability on dimethylamine gas, has a gas detection lower limit of 0.1 ppm, and has huge potential in the aspect of dimethylamine gas detection.

The invention discloses a large-steric-hindrance chiral quaternary ammonium salt phase transfer catalyst derived from quinine as well as a synthesis method and application thereof, belonging to the technical field of asymmetric catalysis. The synthesis method comprises the following steps: dissolving quinine in an organic solvent, adding benzyl bromide, and conducting reacting to obtain an N-benzyl quinine quaternary ammonium salt catalyst; and dissolving a product obtained in the previous step in an organic solvent, adding corresponding large-steric-hindrance benzyl bromide and an inorganic alkali solution, conducting reacting, and performing purifying to obtain the large-steric-hindrance chiral quaternary ammonium salt catalyst derived from quinine. When the large-steric-hindrance catalyst is applied to a reaction for synthesizing chiral alpha-hydroxy-beta-keto ester by oxidizing olefin with potassium permanganate, the enantioselectivity of the product alpha-hydroxy-beta-keto ester can be remarkably improved.

The invention relates to a nano particle composite as well as a synthesis method and application thereof. The synthesis method of the nano particle composite comprises the following steps: performingultrasonic mixing of mesoporous silica and dopamine; stirring and mixing the product with a soluble silver salt solution, to finally obtain a finished product of nano particle composite. The nano particle composite can be applied to organic dye catalytic degradation or bacteria resistance. The synthesis method provided by the invention is green, simple and quick; the obtained nano particle composite realize efficient catalytic degradation of various organic dyes, realizes online catalysis and has a high degree of automation; meanwhile, the nano particle composite has an effect of killing various bacteria and fungi, and realizes broad-spectrum, efficient and continuous sterilization.