46results about How to "Preparation method simple green" patented technology

The invention discloses a method for preparing near-infrared carbon quantum dots by using fuchsin as a carbon source. The method comprises the following steps: weighing 1.0000g of yellow ginger extraction residues, putting into a 50mL hydrothermal reaction kettle, adding 40mL of secondary water, putting in a drying box, reacting at 200 DEG C for 2 hours, after the reaction finishes, cooling to room temperature, and filtering to obtain the carbon quantum dot solution; dissolving 0.01507g of fuchsin, and adding the solvent to a constant volume in a 50mL volumetric flask to obtain a 1.0*10<-3> mol / L fuchsin solution; adding the fuchsin solution and carbon quantum dot solution into a 50mL reaction kettle, uniformly mixing, adding secondary water until the total reaction volume is 40mL, putting in a drying box, and reacting at 220 DEG C for 4 hours; and after the reaction finishes, cooling to room temperature, and filtering to obtain the near-infrared carbon quantum dots. The near-infrared carbon quantum dots prepared by the method have the advantages of stable properties and high fluorescence intensity, and have application prospects in the fields of biological imaging, sensing, drug transfer, photocatalysis, biological living imaging and the like.

The invention belongs to the technical field of medicine and health food, and particularly relates to a preparation method, identification method and application of a dandelion polysaccharide and a selenium nanocomposite thereof. The molecular weight range of the dandelion polysaccharide provided by the invention is 1000-100000Da. The preparation method of the invention is simple, the reaction conditions are mild, and large-scale production is possible; and the chemical structure of the obtained high-purity dandelion polysaccharide is identified, the structure is clarified, and the structure basis is provided for exploring its pharmacological activity mechanism. At the same time, the dandelion polysaccharide-selenium nanocomposite obtained by the present invention has high selenium content, uniformly dispersed particles, strong antitumor activity, and has potential application value in the field of medicine.

The invention relates to a boron / nitrogen co-doped gelatin-based two-dimensional carbon plate and a preparation method and application thereof. The preparation method comprises the following steps of: dissolving and mixing gelatin and boric acid which serve as raw materials, carrying out evaporation-induced assembly, co-pyrolysis and boiling water backflow to prepare the two-dimensional carbon plate; mixing the boron / nitrogen co-doped two-dimensional carbon plate, carbon black and polytetrafluoroethylene according to a proportion to prepare a carbon pole piece serving as a supercapacitor electrode piece; or mixing with the carbon black and polyvinylidene fluoride according to a proportion to prepare a slurry serving as an electrode piece of a button lithium ion battery. The obtained carbon plate has high content of nitrogen and boron, pore size distribution is concentrated, and the carbon plate is large in size and thin in thickness; such carbon plate has a series of advantages of high specific capacitance, high rate performance and the like when serving as the electrode materials of a supercapacitor and the lithium ion battery; and moreover, the electrode has high cycling stability. The preparation method has the advantages of simplicity and greenness in process, short consumed time and the like, and the device is simple and available.

The invention relates to an iridium complex containing a carboryl benzimidazole structure and a preparation method and application thereof. The preparation method of the iridium complex comprises the following steps: 1) adding the n-BuLi solution to the carborane solution, and then React at room temperature for 30-60min; 2) Add bromobenzimidazole and react at room temperature for 6-8h; 3) Add [Cp*IrCl 2 ] 2 , and react at room temperature for 3‑5h, after post-treatment to obtain the iridium complex; the iridium complex is used to catalyze the asymmetric reduction of aryl ketones to prepare chiral alcohols. Compared with prior art, the present invention uses binuclear iridium compound [Cp*IrCl 2 ] 2 As a raw material, it is reacted with n-BuLi and ortho-carboryl benzimidazole to obtain a trivalent iridium complex containing an ortho-carboryl benzimidazole structure. The iridium complex has stable physical and chemical properties and Thermal stability, and the synthesis process is simple and green. It catalyzes the asymmetric reduction reaction of aryl ketones to synthesize chiral alcohols under mild conditions. It has excellent catalytic activity, enantioselectivity and high yield.

The invention discloses a preparation method of ultra-thin graphene powder and a product thereof, belonging to the technical field of graphene preparation. The method of the present invention specifically comprises the following steps: first, a graphite rod is used as a working electrode, a DC voltage is added to the electrolytic solution, electrolysis is performed, and a graphene precursor is obtained through post-treatment; then the graphene precursor is dissolved and ultrasonically filtered, The filtered solid is placed in an autoclave for treatment for a period of time, and then the pressure is quickly reduced to reduce the pressure in the autoclave to normal pressure. Finally, the obtained product is repeatedly washed and dried by centrifugation, and the ultra-thin graphene powder is prepared. The present invention combines the advantages of the electrochemical method and carbon dioxide, and the entire stripping process maintains the internal crystal structure of graphene to the greatest extent. The thickness of the prepared ultra-thin graphene is only 1-5nm, and the sheets are uniform and continuous. With few defects and high electrical conductivity, it has broad application prospects in the fields of electronic components, catalysis and new energy.

The invention relates to a ruthenium complex containing an ortho-carboryl benzoxazole structure and its preparation and application. The preparation method of the ruthenium complex comprises the following steps: 1) adding n-BuLi solution to an ortho-carborane solution , then react at room temperature for 30‑60min; 2) add bromobenzoxazole, and react at room temperature for 6‑8h; 3) add [(p‑cymene)RuCl 2 ] 2 , and reacted at room temperature for 3‑5h, after post-treatment to obtain the ruthenium complex; the ruthenium complex is used to catalyze the autoxidative coupling of primary amines to prepare imine compounds. Compared with the prior art, the bivalent half-sandwich ruthenium complex containing the ortho-carboryl benzoxazole structure prepared by the present invention has stable physical and chemical properties and thermal stability, and the ruthenium complex can The product is still stable, and the preparation method is simple and green, and it shows excellent catalytic activity and yield in the reaction of catalyzing the autoxidative coupling of primary amines to synthesize imine compounds.

The invention relates to a PtCo / C electrocatalyst and a preparation method thereof. The catalyst carrier is carbon black material, the active component is Pt or soluble Pt, the auxiliary agent is the soluble inorganic salt of Co, and the Pt accounts for 30-50% of the total mass of the catalyst. , the molar ratio of Pt and Co is 3-1:1, and the preparation method is as follows: adding the active component precursor and auxiliary agent precursor into the carrier step by step, reducing the active component by a reducing agent, filtering, washing, Precipitation, drying, grinding, and then the obtained powder is further reduced by using a reducing gas under high temperature conditions to further reduce the auxiliary precursor to obtain a product. The invention adopts the water-phase dispersion mixing preparation method and the high-temperature gas reduction method, uses a reducing agent to reduce the metal Pt and Co from the precursor, and supports it on the carrier carbon black material, which can be used for industrialized large-scale preparation, and the prepared catalyst particles are evenly distributed. , small size, high catalytic activity of oxygen reduction reaction, simple operation and low preparation temperature.