40results about How to "Reaction conditions are green and environmentally friendly" patented technology

The invention relates to the technical field of preparation of carbon nanomaterials and provides a preparation method of nitrogen-doped fluorescent carbon dots. The preparation method comprises the following steps: 1, a carbon source is broken, ground, sieved by a 200-mesh sieve and dried in an oven; 2, the carbon source dried by the oven is weighed and placed into a 50-ml beaker, then an organic solvent is added, and a mixture is stirred sufficiently and subjected to ultrasonic processing for 0.8-1.2 h; 3, the mixture prepared in the step 2 is placed in a 50-ml hydrothermal kettle to have a hydrothermal reaction for 2-12 h, and the temperature is controlled at 60-180 DEG C; 4, after step 3, a suspension is taken out and placed into a high-speed desk centrifuge, supernatant liquor is taken out after 10-20 min of centrifugation, and hydrosol of the fluorescent carbon dots is obtained; 5, the hydrosol, obtained in the step 4, of the fluorescent carbon dots is placed in rotary evaporation equipment, the organic solvent is removed, and the target product fluorescent carbon dots are prepared. The preparation method of the nitrogen-doped fluorescent carbon dots has the characteristics of green and environment-friendly reaction conditions, easiness in control and easiness in mass production and preparation and is expected to be widely applied to the fields of photoelectric devices, bio-imaging, detection, sensing and the like.

The invention discloses a preparation method for organic phase carbon dots. The preparation method comprises the steps that raw material are fetched and added into a reaction kettle, and the raw materials are subjected to a solvothermal reaction for 0.5-72 hours under the condition of 150-300 DEG C, so that an organic phase carbon dot solution is obtained; liquid is concentrated, an obtained solvent returns to the reaction kettle for cycle use, and solid is dried to obtain organic phase carbon quantum dots, wherein the raw materials are one of or the composition of several of N,N-dimethyl formamide, N,N-dimethylacetamide, dimethyl sulfoxide, normal hexane, cyclohexane, methylbenzene and xylene. The technological method is simple and rapid, reaction conditions are simple and friendly to environment, yield is high, and reaction time is reduced. The adopted raw materials are cheap and easy to obtain, catalyst does not need to be added, and the solvent can continue to be recycled. The prepared organic phase carbon dots have good dispersity in an organic solvent, and have wide application in the fields of organic coating, substance detection, catalysis, fluorescent ink, novel nanocomposite, novel electrochemical electrodes, novel optical materials and the like.

Belonging to the technical field of inorganic chemistry, the invention discloses a preparation method of a porphyrin COF and carbon nitride composite material and application in photocatalytic degradation of organic dyes. Copper tetraminophenyl porphyrin and terephthalaldehyde are compounded on the surface of g-C3N4 through amine-aldehyde condensation reaction by grinding. The method has the advantages of simple operation, mild reaction conditions, high yield, low cost, easy large-scale production and the like. The material CuP-Ph-COF/g-C3N4 is used as a photocatalyst to degrade the dye rhodamine B, shows excellent ability of photocatalytic degradation of organic pollutants, and is expected to be practically applied in dye wastewater treatment.

The invention provides a method for degradation of a composite material by directional bond breaking and recovery of fibers from the composite material. The method comprises the following steps that (1) the composite material is cut into composite material blocks with the target size for standby application; (2) the composite material blocks, solvents, metal salts, ligands, pH regulators and oxidants are mixed evenly, and then heated, the composite material blocks are naturally cooled to the room temperature after being completely degraded, and then high-speed centrifugal separation is conducted to obtain crude fiber products; and (3) the crude fiber products are washed and dried, and finally fiber fine products are obtained. According to the method, through the hot solvent effect, unsaturated complexation and weak complexation, the solvents, the metal salts, the ligands, the pH regulators, the oxidants and the composite material are mixed, and then heated, directional bond breaking degradation of resin is achieved, finally the fibers with little surface resin residue, basically no defect and the fiber strength retention rate up to 97.1% are obtained, and the degradation rate of the resin is as high as 100%.

A method of synthesizing a quinazolinone-structured compound includes the steps of adding an alcohol and amine as substrates in a liquid solvent with a peroxide as an oxidizing agent, and performing a reaction under the effects of a catalyst at 0-150 DEG C for 10-20 h to synthesize the quinazolinone-structured compound, wherein the catalyst includes metal oxides and/or metal oxides having a defect locus, and the metal oxides include one or more than two of [alpha]-MnO2, [beta]-MnO2, [delta]-MnO2, Mn2O3, Mn3O4, Fe2O3, V2O5, Co3O4 or MoO3, and the metal oxides having the defect locus is MnO2 treated in the presence of argon gas. The method, under a mild condition, is used for synthesizing the quinazolinone-structured compound at high efficiency and selectivity. The method has mild operation conditions and reaches 96% in yield of the quinazolinone-structured compound.

The invention discloses a synthesis method of a natural product of E-2,3',4,5'-tetrahydroxy diphenyl ethylene. According to the method, 1,3-acetone dicarboxylic acid dimethyl ester is used as a starting raw material; condensation and aromatization reactions are performed to obtain 3,5-dihydroxy-2,4-dicarboxylate methyl phenyl acetate; then, hydrolysis and decarboxylation are performed to obtain 3,5-dyhydroxy phenylacetic acid; the 3,5-dyhydroxy phenylacetic acid and 2,4-dihydroxy benzaldehyde take condensation reaction under the existence of alkali to obtain 3-(3,5-dihydroxy phenyl)-7-hydroxy coumarin; next, open loop decarboxylation reaction is performed under the alkaline condition; the natural product of E-2,3',4,5'-tetrahydroxy diphenyl ethylene is obtained. The method has the advantages that the raw materials are easily obtained; the reaction route is simple and fast; the operation is convenient; the yield is higher.

The invention discloses a bismuth-containing catalyst for preparation of glyceric acid through selective oxidation of glycerin and a preparation method of the catalyst. The bismuth-containing catalyst is characterized in that the catalyst takes bismuth as an active component and layered hydroxide or layered metal composite oxide as a carrier. The preparation method comprises steps as follows: a bismuth salt solution is prepared; a soluble metallic salt solution is prepared, the two solutions are slowly added to a certain quantity of soluble carbonate solutions for pH value adjustment, stirred at the constant temperature to be aged, cooled, washed to be neutral, subjected to suction filtration under reduced pressure and vacuum drying and then calcined, and the catalyst is obtained. The prepared catalyst is used for preparation of glyceric acid through selective oxidation of glycerin and has the characteristics of high glycerin conversion rate, good selectivity of the product, namely, glyceric acid, simple preparation method, good repeated use performance and low cost.

The invention belongs to the technical field of ceramic fiber materials, and discloses a preparation method of a high-entropy oxide ceramic fiber material. The preparation method comprises the steps: preparing high-entropy oxide ceramic fibers through a template impregnation method, taking viscose as a template, and subjecting the viscose to vacuum impregnation in a metal nitrate mixed solution, wherein metal nitrate in the metal nitrate mixed solution is formed by mixing at least four of cerous nitrate, zirconium nitrate, yttrium nitrate, hafnium nitrate, titanium nitrate and lanthanum nitrate in equal molar mass; and after the impregnation,performing washing, centrifuging, drying and heat treatment to obtain the high-entropy oxide ceramic fiber. According to the preparation method, liquid-phase burdening is adopted, the method can guarantee that multiple metal elements are mixed uniformly, the prepared high-entropy oxide ceramic fiber material is uniform in morphology, the phase structure is of a fluorite type, and the proportion of elements contained in the fiber material is close to equal moles.

The invention discloses a preparation method of a 3-aryl-2H-benzo [beta] [1, 4] benzoxazine-2-ketone compound, which comprises the following steps: carrying out magnetic stirring on a reaction substrate 2-aminophenol compound and a ketonic acid compound in an oil bath pot by using a deep eutectic solvent as a reaction solvent, and carrying out after-treatment after the reaction is finished, thereby obtaining the 3-aryl-2H-benzo [beta] [1, 4] benzoxazine-2-ketone compound. The deep eutectic solvent is formed by uniformly mixing choline chloride and urea according to a molar ratio of 1: 2, and then heating the mixed solution to a uniform and transparent liquid at 80 DEG C. The method is simple in operation process, mild in reaction condition, low in cost and environmentally friendly, and hasapplication and popularization value.

The invention belongs to the technical field of compound synthesis, and particularly relates to a method for synthesizing quinoxaline compounds under visible light induced iron catalysis conditions. The method comprises the following steps: by taking non-activated aliphatic amine and o-phenylenediamine as raw materials, under the action of a photosensitizer, under the illumination of visible light, reacting in a solvent at room temperature and under oxygen conditions to generate the quinoxaline compound. The method has better substrate universality and relatively mild reaction conditions, not only realizes synthesis of the quinoxaline compound for the first time, but also widens the field of organic synthesis.

The invention relates to a synthesis method of 2-amino-4, 6-dihydroxypyrimidine. Guanidine nitrate and diethyl malonate are employed as the raw materials for one-step cyclization reaction. The steps include: employing a new-made sodium ethoxide solution, diethyl malonate and self-made guanidine nitrate to carry out stirring reflux reaction for 0.5-1.5h, distilling off ethanol, then dissolving the obtained white solid in water, then using a 4-6% acetic acid solution to conduct acidification to a pH value of 4-6, and carrying out filtering, washing and drying, thus obtaining a white solid 2-amino-4, 6-dihydroxypyrimidine. The method provided by the invention has the advantages of simple reaction steps, low reaction temperature, safety and environmental protection, is suitable for industrial production, and has wide application prospect.

The invention discloses a metal-loaded cerium-zirconium solid solution material and a preparation method thereof, and application of the metal-loaded cerium-zirconium solid solution material in catalytic synthesis of carvone. The metal-loaded cerium-zirconium solid solution material is used as a catalyst for selective catalytic synthesis of carvone, and the optimal condition for catalytic synthesis of carvone is found; and a new way is provided for green synthesis of carvone.

The invention discloses a metal oxide-sulfide composite negative electrode material and a preparation method thereof. Cu2O nanoparticles are uniformly loaded on the surface of a relatively thin MoS2 nanosheet. According to the novel metal oxide-sulfide composite negative electrode material, the Cu2O nanoparticles are relatively uniform in size and regular in shape and form, and can be uniformly loaded on the MoS2 nanosheet through van der waals force. The composite material is used as an active substance of a negative electrode material for a lithium-ion battery, the electrochemical properties(current density: 200mA g<-1> and voltage: 0.01-3V) are tested, and the result shows that the specific capacity and the cycling stability of the composite material are far better than those of a Cu2Omonomer and the capacity retention ratio of the material is extremely high. The preparation method is green, environment-friendly, mild in condition, relatively short in reaction time, easy to operate and suitable for industrial production, and has a broad application prospect.

The invention discloses a microwave synthesis method for 1,2,3,5-tetrasubstituted azocene compounds, which comprises equimolar amounts of aromatic terminal alkynes, trimethylcyanosilane, formamide compounds, and catalysts Catalyzed reaction assisted by microwave to obtain 1,2,3,5-tetrasubstituted azocene compounds in one pot and one step. The method has good product selectivity, high yield, simple separation process, low catalyst cost, environmental friendliness, and is beneficial to industrial production and application.

The invention discloses a preparation method of a 2-arylbenzothiazole compound, which comprises the following steps: adding a reaction substrate 2-aminothiophenol and ketonic acid(or aldehyde) into adeep eutectic solvent, magnetically stirring in an oil bath pot at 60-90 DEG C, and carrying out after-treatment after the reaction is finished to obtain the 2-arylbenzothiazole compound, wherein a deep eutectic solvent is a reaction solvent, and other catalysts are not needed. The method is simple to operate, mild in reaction condition, efficient in reaction, high in atom economy, few in byproducts and green and environment-friendly in reaction process, and has popularization and application values.