49results about How to "The experimental process is controllable" patented technology

The invention discloses a nano-cerium oxide and a preparation method thereof. The preparation method of the nano-cerium oxide comprises mixing a cerium salt and a carbonate or an oxalate according to a molar ratio of 1: (1-3), and then adding alcohols The dispersant is fully ground and reacted, washed and dried after the reaction to obtain a precursor; and then the precursor is calcined. It uses cerium salt and carbonate or oxalate as raw materials, and adds alcohol dispersant, adopts solid-phase chemical reaction in alcohol environment to prepare precursor by grinding, and then prepares cerium oxide powder by calcination. The cerium oxide powder prepared by the above method has small particle size, high purity, and good dispersibility; the whole process is simple, easy to operate, low in cost, low in equipment requirements, green and environmentally friendly, and the output of cerium oxide is large, and the operation procedure is continuous Adjustable, easy to control the experimental process, easy to industrial production.

The invention discloses a method for preparing titanium dioxide powders with different shapes by a solid-phase method. The method includes the following steps: S1: weighing solid titanium oxysulfate and solid sodium carbonate in a ceramic mortar, S2: adding different surface active substances in a ceramic mortar, S3: Add a small amount of water to the solid mixture, continue grinding, S4: Transfer the mixture to a centrifuge tube, centrifuge on a centrifuge, pour off the supernatant after the end, add water, use a glass Rod stirring for 2min-5min, centrifuging again, and repeating the centrifugation five times, S5: place the washed solid in an oven at 110 ° C for drying for 1h, S6: put the dried powder into a muffle furnace for calcination, S7: calcine After the sample is loaded into the sample bag. The solid-phase synthesis method of titanium dioxide powder of the invention has simple process conditions, low cost, low requirements for equipment, green environmental protection, small particle size of titanium dioxide, large output, continuously adjustable operation procedure, and easy industrial production.

The invention provides a composite fiber membrane for purifying Cs in water and a preparation method thereof. The composite fiber membrane can effectively purify radioactive Cs in water, and is widely used in the research of radioactive isotopes and in the treatment process of wastewater discharged from hospitals and factories. The specific method is: firstly, SiO is prepared by electrospinning technology 2 Nanofibrous membranes, modified with 3-aminopropyltriethoxysilane, with K 4 Fe(CN) 6 and FeCl 3 The nano-Prussian blue was grown on the surface of the nanofiber membrane by reacting under hydrothermal conditions, namely, a nano-Prussian blue composite fiber membrane was constructed. The composite fiber membrane uses silica as a carrier, which can selectively adsorb Cs elements and realize efficient purification of radioactive Cs elements. Compared with traditional industrial Cs separation methods, the composite fiber membrane has the advantages of low energy consumption, high separation efficiency, and one-step curing. Separation, no secondary pollution, effectively avoid the shortcomings of redundant separation operations and large amount of radioactive waste in traditional methods.

The invention relates to a sandwiched porphyrin-phthalocyanine mixed double-layer metal complex (Eu(TpyP)(Pc)) nanotube and a preparation method and application thereof, and belongs to the technical field of organic semiconductor material chemistry. The Eu(TpyP)(Pc) nanotube is prepared for the first time; the method comprises the steps that 1, Eu(TpyP)(Pc) is dissolved by a specific solvent to form a solution with the concentration being 0.001-0.005 mmol / mL; 2, AAO is soaked into the solution prepared in the step 1, and placed for 8-12 h in a sealed mode; then, the solution is removed, and vacuum drying is performed; 3, a sodium hydroxide water solution with the concentration being 6 mol / L is used for dissolving the AAO in the Eu(TpyP)(Pc) nanotube containing the AAO prepared in the step 2. The preparation method is simple and effective, the experimental process is easy to control and can be executed under the room temperature. The Eu(TpyP)(Pc) nanotube is purified and orderly, toxic gas nitrogen dioxide can be detected under the room temperature, the toxic gas NO2 response concentration is low, the NO2 gas sensitive detection limit under the room temperature is low, response time and recovery time are short, and interference of CO and ammonia gas can be resisted.

The invention discloses a preparation method of 3-ethyl cefadroxil, and belongs to the field of drug synthesis. 7-amino-3-vinyl-8-oxo-5-thia-1-azabicyalo[4.2.0]oct-2-ene-2-carboxylate is taken as a raw material to synthesize the 3-ethyl cefadroxil by five-step reaction. According to the preparation method, the process design is reasonable, the operability is high, reaction conditions are simpler,the yield is high, and large-scale production can be realized. The 3-ethyl cefadroxil prepared by the method provides an important basis for performing scientific evaluation of quality, safety and efficiency, pharmacological research, pharmacokinetic research and the like on the 3-ethyl cefadroxil, also can serve as a possible new drug to be further researched and developed for treating urinary system, respiratory tract, skin, five sense organs, gastrointestinal tract infections and the like caused by staphylococcus, streptococcus, pneumococcus, escherichia coli and the like, and has importantapplication value.

The invention discloses a method for preparing cobalt-doped zinc oxide nanorods through sol-gel. The method comprises the steps of dissolving dihydrate zinc acetate and tetrahydrate cobaltous acetate into ethylene glycol monomethyl ether according to the stoichiometric ratio of Zn<1-x>Co<x>O, stirring the mixture uniformly, and obtaining a mixed solution; dropwise adding ethanolamine to the mixed solution, conducting a reaction under the condition that the mixture is stirred at the temperature of 60-80 DEG C, cooling the mixture naturally to the room temperature after the reaction is ended, and obtaining clear cobalt-doped zinc oxide precursor sol; drying the clear cobalt-doped zinc oxide precursor sol, obtaining dried gel, then making the dried gel be subjected to a heat treatment process in the air atmosphere, and obtaining the clear cobalt-doped zinc oxide nanorods. According to the method, the cobalt-doped zinc oxide nanorods are prepared through a multicomponent uniform reaction sol-gel method, and the method has the advantages that the process is simple, the reaction temperature is low, the cost is low, the test process is easy to control, the product crystallinity degree is high, and the crystalline phase is pure, and the obtained clear cobalt-doped zinc oxide nanorods have ferromagnetism at the room temperature.