1327results about How to "Lower reaction cost" patented technology

The invention relates to the field of synthesis of nano-materials and particularly relates to a method for synthesizing a series of Ag:ZnIn2S4 luminescent quantum dots by using a simple and rapid hydrothermal method in one step. Fluorescence is adjustable in the range of 460nm to 830nm, the fluorescent life is relatively long, and the luminescent quantum dots can be applied to water-decomposed hydrogen production under visible light. The method comprises the steps of firstly, mixing and dissolving silver nitrate, indium nitrate, zinc acetate dihydrate and L-cysteine in an aqueous solution, adjusting the pH value of the solution to 8.5 by using NaOH, adding thioacetamide into the solution, carrying out ultrasonic stirring, then, carrying out a hydrothermal reaction for 4 hours at the temperature of 110 DEG C, and carrying out centrifugal drying after the reaction ends, thereby obtaining Ag@ZnIn2S4 nanocrystals of different ratios. Proven by a photocatalytic hydrogen production experiment under the visible light, the prepared composite photocatalyst has good photocatalytic activity.

The invention discloses a combination electrode preparation method and the application of the combination electrode preparation method in a bioelectricity Fenton system, and belongs to the field of environmental engineering and waste water treatment. According to a combination electrode prepared through the combination electrode preparation method, a bioelectrochemistry system serves as a reactor to treat azo dye waste water, anode electro-microorganisms oxidize organic matter so that electrons and protons can be generated, the electrons and the protons are transferred to a cathode chamber through an external circuit and an ion exchange membrane, H2O2 is generated on a cathode in an in-situ mode with O2 as the electron acceptor, a cathode iron source is slowly released, Fenton reaction is performed between iron and H2O2 generated in the in-situ mode, and thus non-biodegradable pollutants are treated.

The invention relates to a method for preparing an iron modified SBA-15 mesoporous molecular sieve, which comprises the following steps of: 1) adding nonionic surfactant and ferric nitrate nonahydrate into solution prepared from hydrochloric acid and deionized water in a volume ratio of 1 to 10 with pH of about 1, and stirring the solution at the room temperature till the solution is clear and transparent; 2) adding tetraethoxysilane into the mixed solution obtained in the step 1), placing the mixed solution into an ultrasonic pool, acting ultrasonic wave on the mixed solution for 2 hours, adjusting the pH of the mixed solution to between 3 and 4, transferring the mixed solution to a reaction kettle, and hydro-thermally crystallizing the mixed solution for 24 hours at the temperature of 100 DEG C to form the iron modified SBA-15 mesoporous molecular sieve; and 3) filtering the reaction solution obtained in the step 2), repeatedly washing a filtered substance by using water and drying the filtered substance, and calcining the filtered substance for 6 hours at the temperature of 550 DEG C to obtain the SBA-15 mesoporous molecular sieve of which iron ions are high dispersed inside and outside a skeleton. The method reduces the reactive ageing time to 2 hours from 20 hours, does not need to use a mineralizing agent NH4F, greatly shortens the reaction period, and reduces the reaction cost.

The invention discloses an optimized in vitro cell-free protein synthesis system. The system comprises a cell extract, a carbohydrate material, a phosphate compound, a buffering agent and a DNA molecular template for encoding an exogenous protein, wherein the cell extract is a yeast cell extract inserted into a T7 RNA polymerase gene; the carbohydrate material is a mixture of glucose and maltodextrin; the buffering agent is a trihydroxymethyl aminomethane buffering agent; and the DNA molecule template is prepared by a nucleic acid isothermal amplification method, and a sequence as shown in SEQID NO.1 is inserted into the upstream of the coding sequence of the exogenous protein in the DNA molecular template. By optimizing, the cost of in vitro protein synthesis is reduced and the yield ofthe target protein is increased.

Synthesis of pyridine-N-oxide is carried out by preparing sodium tungstate into carrier phosphate-tungstic acid by wetting method, vacuum drying to generate anhydrous product, putting anhydrous product and carrier into container, formulating solution by deionized water, agitating to remove water content, drying at high-temperature, activating to obtain catalyst, putting catalyst and pyridine into flask, oxidation reacting by hydrogen peroxide, filtering out catalyst and decompress distilling to obtain the final product. It's simple, fast and cheap and has less solvent.

The invention relates to an electrochemical preparation method of 2-N-substituted benzoxazole compounds. The 2-N-substituted benzoxazole compounds are obtained by constant current electrolysis in a single-chamber electrolytic cell by utilizing benzoxazole compounds and amine as raw materials and utilizing a halide as an electrocatalyst, wherein the dosage of the catalyst is 5-20% (mol), an organic solvent serves as electrolyte, glacial acetic acid serves as an additive, the reaction temperature is 0-40 DEG C and the current density is 2-10mA/cm<2>. According to the method provided by the invention, an indirect electrolytic method is used for the first time to synthesize the 2-N-substituted benzoxazole compounds, thereby avoiding the use of excessive organic hypervalent iodine reagent with high price and potential explosiveness or other co-oxidants and avoiding the generation of reduction wastes resulting from the use of the excessive oxidant or co-oxidant as well. According to the method provided by the invention, common industrial reagents and conventional production conditions, instead of supporting electrolyte, are used, and the reaction conditions are mild, so that the method is more suitable for industrial production.

The invention discloses a Pd-Ni/Al2O3 catalyst, its preparation method and an application thereof. With PdCl2 and Ni(NO3)2 being used as active components and Al2O3.H2O being used as a catalyst carrier, the Pd-Ni/Al2O3 catalyst is prepared by loading the active components onto the catalyst carrier, wherein the gross mass of PdCl2 and Ni(NO3)2 is 0.5-1 wt% of the weight of Al2O3.H2O and the mass ratio of Pd to Ni in the active components is 1:0.5-3. The Pd-Ni/Al2O3 catalyst can be used as a selective catalyst in cyclopentadiene selective hydrogenation for synthesis of cyclopentene. By the adoption of the catalyst, hydrogenation reaction can be conducted at normal temperature; the reaction condition is mild; conversion rate and selectivity are very good; the conversion rate is 98-99.5%; and the selectivity of cyclopentene also reaches 97-98.5%.

The invention relates to a method for preparing 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl capable of being used as a liquid crystal material from 2,2'-bis(trifluoromethyl)-4,4'-dinitrobiphenyl by reduction reaction. According to the specific technical scheme, the method comprises the following steps: carrying out coupling reaction of 2-bromo-5-nitrobenzotrifluoride in the presence of a transition metal (Pd, Cu, Ni) catalyst to obtain 2,2'-bis(trifluoromethyl)-4,4'-dinitrobiphenyl; and catalyzing by a Cu oxide or metal Pa in the hydrogen atmosphere to obtain 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl. The process for preparing 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl has the advantages of less emission of the three wastes and high yield.

The invention relates to a surface material with protein adsorption resistant property and a preparation method thereof, belonging to the technical field of biological materials. The surface material is an organic silicon surface material polymerized by monomer molecules with diionic property and organic silicon, has good protein adsorption resistant property and can be extensively applied to the fields of marine antifouling materials and biomedical materials. The surface material which has the protein adsorption resistant property through surface modification is prepared by carrying out graft polymerization on the monomer molecules with the diionic property on the surface of an organic silicon substrate; the surface material is combined with water molecules in a marine environment to form a water film on the surface of the material and can prevent the adsorption of proteins on the surface of the material because the water molecules contained in the water film are compactly arranged, thereby inhibiting the further adhesion of marine fouling organisms on the surface of the material and achieving the effect of effectively preventing and removing the fouling of marine organisms; in addition, the invention has wide application prospect.

The invention provides a method for preparing acetylacetone metallic compound, comprising soluble metal salt solution and aqueous alkali are quickly mixed together through a full back-mixing liquid membrane reactor to prepare precipitation grout of hydroxide with nanometer level, the precipitation of hydroxide is not needed to be separated and directly added with acetylacetone to react at the normal temperature to obtain the acetylacetone metallic compound. The method adopts the full back-mixing liquid membrane reactor to synthesize hydroxide with nanometer level, thus shortening the reaction time between the hydroxide and the acetylacetone and improving the preparation efficiency; meanwhile, by controlling the adding quantity of alkali and the acetylacetone in the crystal-transformation process, the reaction yield is greatly improved. The preparation method is simple in technique, convenient in operation and short in reaction time, and the obtained product has the yield being more than 95%.

This invention discloses a method for removing sulfur-containing compounds from fuel oil by phase-transfer catalytic oxidation. The method comprises: preparing six types of heteropolyacid quaternary ammonium salts as the phase-transfer catalysts from quaternary ammonium salts and phosphomolybdic acid/tungstophosphoric acid, mixing the phase-transfer catalysts, fuel oil, and peroxyformic acid oxidant (prepared from H2O2 and formic acid at a weight ratio of 3.5:(1-1.5)), reacting at 25-55 deg.C under ultrasonication for 1-2 h, and separating fuel oil and peroxyformic acid to obtain desulfurized fuel oil. The method avoids adsorption and extraction procedures due to the heteropolyacid quaternary ammonium salts phase-transfer catalysts, and has such advantages as simple process, and high reaction rate. The catalyst has such advantages as no toxicity and no pollution, and is recyclable and environmentally friendly.

The invention relates to a method for preparing a selenide ferrous iron nanometer flower. The material can be used as an active material of an anode of a lithium ion battery. The method for preparing the selenide ferrous iron nanometer flower comprises the following steps that: according to the ratio of 0.1 mol:0.1 mol:100 mL, selenium powder, sodium sulfite and deionized water are picked up, heated and stirred to obtain a solution of Na2SeSO3; 2) according to the ratio of 10g:100 mL, polyvinyl alcohol and distilled water are picked up, heated and stirred to obtain a water solution of polyvinyl alcohol; 3) according to the ratio of 2.5 mmol:5 mL:20 to 30 mL : 20 to 30 mL, F3C2O4, citric acid with the concentration of 1 M, the solution of Na2SeSO3 and the water solution of polyvinyl alcohol are picked up, mixed and stirred, and by adjusting the pH value of the system to be 8-10, an even rheological phase matter is obtained; 4) the obtained matter is kept at a temperature of between 160 and 180 for 10 to 24 hours and then naturally cooled to obtain a hydrothermal product; 5) the hydrothermal product is subjected to centrifugal separation; and 6) the hydrothermal product is dried to obtain the red brown selenide ferrous iron nanometer flower. The method has the characteristics of simple process and low synthetic temperature.

The invention belongs to the technical field of nano-material synthesis, and particularly relates to a preparation method and the application of a ternary composite photocatalyst. The preparation method comprises the following steps: first, synthesizing CQDs (Carbon Quantum Dots) with a remarkable up-conversion fluorescence effect by utilizing a simple one-step alkali auxiliary ultrasonic processing method; then, generating silver oxide (Ag2O) with an octahedral structure in CQDs solution by a wet-chemical method to obtain a CQDs/Ag2O compound with a CQDs coating layer; finally, loading silver (Ag) nano-particles on the surface of the CQDs/Ag2O by using chemical deposition and photo-deposition methods. The ternary composite photocatalyst can be used for degrading organic pollutants, such as rhodamine B, under full spectrum.

The invention belongs to the field of preparation of a metal organic framework material, and relates to a preparation method of a novel adsorption material carbon nano-tube/UiO-66-NH2. The preparationmethod comprises the following steps: firstly, performing acidizing treatment on a multi-wall carbon nano-tube to ensure that carboxyl located at the defect sites of the carbon nano-tube is functionalized and then a coordinate bond is formed by simultaneously an organic ligand and metal ions, and performing self-assembly to form a nano-composite material. The carbon nano-tube participates in theUiO-66-NH2 material in a form of physical blending, and the carbon nano-tube/UiO-66-NH2 composite material is also formed in a form of chemical bond. Because addition of the carbon nano-tube, the water stability of the metal organic framework material is obviously improved, and the heat stability, the specific surface area and the pore volume aperture of the composite material are all improved toa certain extent, and thus, the composite material has more excellent adsorption performance. The preparation method is simple and effective, and a new way is provided for preparing the nano-tube/MOFscomposite material.