49 results about "1-butyl-3-methylimidazolium tetrafluoroborate" patented technology

An improved electrolyte for a cell having an anode comprising magnesium or magnesium alloy. The cell's cathode may desirably include iron disulfide (FeS₂) as cathode active material. The improved electrolyte comprises a magnesium salt, preferably magnesium perchlorate dissolved in an organic solvent which preferably includes acetonitrile or mixture of tetrahydrofuran and propylene carbonate. The electrolyte includes an additive to retard the buildup of deleterious passivation coating on the magnesium anode surface, thereby enhancing cell performance. Such additive may preferably include 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF₄), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF₆), lithium hexafluorophosphate (LiPF₆), or aluminum chloride (AlCl₃)

The invention discloses a method for measuring residual erythromycin in an environment by using a hydrophilic ionic-liquid aqueous two-phase system. The method comprises the following steps of: forming the ionic-liquid aqueous two-phase system by using 1.5 grams of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) and 11 grams of NaH2PO4, at least extracting the solution for 2 hours once by using the extracting system, standing the solution after extraction, measuring the concentration of the residual erythromycin in the water phase after the split phases are clear, and calculating the extraction rate of the erythromycin by using the erythromycin content of the water phase before and after the extraction. According to the method, the extraction rate of the erythromycin can reach 99.31 percent. The method has the characteristics of wide linear range, low detection limit, small relative standard deviation and high measuring yield of a sample. The method can meet the national detection requirement for the residual erythromycin, is simpler to operate, and is suitable for quantitative analysis of residual trace erythromycin in food.

The invention provides a preparation method of anatase nanometer titanium dioxide with an exposed high-activity crystal surface. According to the method, isopropyl titanate is used as a titanium source; isopropanol and 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid are used as morphology control agents; acetic acid is used as a reaction solvent; the nanometer titanium dioxide is prepared by a solvothermal method. The anatase nanometer titanium dioxide containing rich {001} crystal surfaces is prepared by regulating the mole ratio of the acetic acid to the isopropyl titanate, the solvothermal reaction temperature and the solvothermal reaction time. The product prepared by the method has the advantages of high exposure rate of high-activity crystal surfaces {001}, safety, environment-friendly effect and the like.

The invention relates to a method for fast preparing small-particle-diameter anatase type nanometer titanium dioxide. The method comprises the following steps of (1) mixing deionized water and ethanediol to obtain a mixed solution of deionized water and ethanediol; using ammonium hydroxide for regulating the pH of the mixed solution into a basic state; then, gradually adding tetrabutyl titanate and 1-butyl-3-methylimidazolium tetrafluoroborate into the mixed solution drip by drip during the stirring so as to obtain the uniformly mixed reaction solution; (2) transferring the reaction solution obtained in the step (1) into a microwave reaction kettle for hydrothermal reaction; after the reaction is completed, performing centrifugation separation, washing and drying on the solid products; then, performing roasting to obtain the small-particle-diameter anatase type nanometer titanium dioxide. Under the condition of existence of a proper amount of ammonium hydroxide, the deionized water andthe ethanediol are used as the solvents; fluorine-containing ionic liquid is used for preparation so as to obtain the small-particle-diameter anatase nanometer titanium dioxide. In the synthesis process, only 10 to 30 min is needed; the time consumption is short; simplicity and convenience are realized; the production efficiency is high; the industrialization is facilitated.

The invention belongs to the field of modified carbon nanomaterials and discloses a preparation method of a two-dimensional porous boron-nitrogen double-doping carbon nanomaterial and application thereof. The preparation method disclosed by the invention comprises the following steps: taking urea as a structure template, taking 1-butyl-3-methylimidazolium tetrafluoroborate as a pore forming substance and a doping agent, taking glucose as a carbon source, calcining and performing hydrothermal treatment, thereby obtaining the product. The method disclosed by the invention is simple in operation,short in synthesis period, excellent in repeatability, low in cost and convenient for industrial implementation. The porous boron-nitrogen double-doping carbon nanosheets prepared by the method disclosed by the invention have a uniform and porous thin-layer structure and large specific surface area. Meanwhile, due to introduction of boron atoms, the conductivity is enhanced, the redox activity can be enhanced by virtue of doping of the nitrogen, and ay capacitance is improved. When serving as an electrode material of a supercapacitor, the carbon nanomaterial has high electrochemical energy storage activities including high specific capacitance and excellent cycling stability. When charging/discharging current density is 0.1A/g, the highest specific capacitance can reach 550F/g, and the specific capacitance is much higher than that of most of the carbon-based materials.

The invention discloses a porous titanium dioxide photocatalyst film and a preparation method thereof. A substrate participates in an oxidizing reaction, an ionic liquid is taken as a template agent, and the reaction speed is controlled, so that a pure anatase phase titanium oxide film can be directly obtained on the surface of a titanium sheet. The preparation method comprises the following steps of: preparing a mixed solution of a hydrogen peroxide solution and an ionic liquid, i.e., 1-butyl-3-methylimidazolium tetrafluoroborate; soaking a metal titanium sheet into a reaction liquid for reacting in a baking oven of 80 DEG C for couple hours; and taking the reacted titanium sheet out, and baking to obtain a titanium dioxide film. The preparation method has the advantages of readily-available raw materials, simple process, easiness for controlling conditions, short preparing period and easiness for amplifying on a large scale. The prepared pure anatase structure titanium dioxide film high the advantages of high crystallinity, high purity, firm combination with the substrate, high stability and repeatability.

The invention discloses a preparation method for a Ti<3+>/TiO2 photo-catalyst with a hollow structure, belonging to the technical field of photocatalysis. The method comprises the following steps: by combining fluorine source control and a vacuum calcination method, and taking the ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate as a solvent and a microwave absorbing agent, compounding titanium dioxide with the hollow structure under a microwave-assisted heating condition, and then further modifying by adopting the vacuum calcination method, thereby compounding Ti<3+>/TiO2 with the hollow structure. The catalyst is applied to the field of removing water pollutant under the effect of visible light. The photo-catalyst disclosed by the invention can promote the visible light absorption, and meanwhile, a special shell structure is formed according to the vacuum calcination method, so that the catalyst has excellent recyclability in the photo-catalytic reaction. The preparation method is simple and feasible and is beneficial to large-scale popularization.

The invention relates to the technical field of waste gas treatment, in particular to a novel VOCs absorbent and a preparation method thereof. The novel VOCs absorbent is prepared from, by weight, 50-80 parts of biodiesel, 8-30 parts of a non-ionic surfactant, 4-15 parts of a cosurfactant, 0.5-5 parts of camphene, 4-12 parts of 1-butyl-3-methylimidazolium hexafluorophosphate, 3-8 parts of 1-butyl-3-methylimidazolium tetrafluoroborate and an appropriate amount of water. The prepared novel absorbent has high absorption efficiency for low-concentration organic waste gas, and the absorbent after waste gas treatment can be directly used as fuel for combustion, and the environmental and economic benefits are good.

The invention relates to a method for preparing rare-earth fluoride nanometer mesoporous spheres, and belongs to the technical field of the preparation process of inorganic nanometer materials. The method comprises the following key points of: mixing ionic liquid purchased at the market, such as typical 1-butyl-3-methylimidazolium tetrafluoroborate and absolute ethyl alcohol serving as an organic solvent in a volume ratio of 1:1-1:3 for ultrasonic processing for 5 to 10 minutes; dissolving rare-earth compounds in the mixed solution for stirring for 10 to 48 hours at the temperature of between 10 and 40 DEG C or ultrasonic processing for 1 to 6 hours, wherein the molar ratio of the using amount of the rare-earth compounds to the ionic liquid is 1:10-1:40; performing centrifugal separation on products, and washing the separated products by using deionized water and the absolute ethyl alcohol; and drying the washed products at the temperature of 60 DEG C to prepare the rare-earth fluoride nanometer mesoporous spheres finally. In alcoholic solution of the rare-earth fluoride nanometer mesoporous spheres, the prepared products have a structure of the mesoporous spheres formed by accumulating nanometer granules, the diameter of the rare-earth fluoride nanometer mesoporous spheres is between 50 and 200 nanometers, and the bore diameter is less than 5 nanometers. The products can be applied in the fields of catalysis, biology, medicine and photics.

The invention relates to an 18beta-glycyrrhetinic acid molecularly imprinted polymer with metal ions as a bridging agent and a monolithic column. The polymer is used as an adsorbing agent for solid phase extraction and separation of glycyrrhetinic acid epimers. The polymer is prepared from 1.55-4.12% of 18beta-glycyrrhetinic acid, 0.82-2.18% of cobaltous acetate, 2.73-2.80% of 4-vinyl pyridine, 0.26-0.32% of azodiisobutyronitrile, 15.63-31.25% of ethylene glycol dimethacrylate, 43.28-43.80% of 1-butyl-3-methylimidazolium tetrafluoroborate, 3.18-3.59% of N,N-dimethylformamide and 18.47-20.01% of dimethyl sulfoxide. Compared with an imprinted polymer with no metal ion, the imprinting factor of the polymer synthesized through the method is improved by about 3 times, and the polymer is dried, ground and screened (74 micrometers) to be used as an adsorbing agent to be placed into an SPE column for carrying out separation and enrichment on 18beta-glycyrrhetinic acid in glycyrrhetinic acid crude extract. The recovery rate of the obtained sample is 91.1%, and the purity of the obtained sample is 93.8%. Accordingly, the polymer can be used for separation, purification and enrichment of the glycyrrhetinic acid crude extract.

The invention discloses a method for preparing Ni-Fe hydroxide nanometer films through electrodeposition. According to the method, cyclohexanol is used as an oil phase, TX-100 is used as a surfactant, 1-butyl-3-methylimidazolium tetrafluoroborate is used as a cosurfactant, an aqueous solution of Ni(NO3)2 and Fe(NO3)3 is used as an aqueous phase, antiphase quaternionic ionic liquid microemulsion with higher conductivity is prepared, then the microemulsion is used as electrolyte, and the Ni-Fe hydroxide nanometer films are prepared by an electrodeposition method. According to the method disclosed by the invention, the 1-butyl-3-methylimidazolium tetrafluoroborate is added to the microemulsion, so that the conductivity property of the microemulsion is improved, and the electrodeposition efficiency is improved; the 1-butyl-3-methylimidazolium tetrafluoroborate is used as the cosurfactant to participate in the formation of micro micelles, and is used as a soft template agent to prevent nanometer particles from clumping, so that the size of a microreactor can be effectively controlled, further the size of Ni-Fe hydroxide is controlled, the catalysis specific surface areas are effectively increased, and the catalytic property of the Ni-Fe hydroxide as a water decomposition anode catalyst is improved.

The invention provides an ionic liquid modified urate oxidase enzyme membrane and a preparation method thereof, and belongs to the technical field of an electrochemical biosensor and preparation thereof. The enzyme membrane uses a nitrocellulose membrane as a substrate membrane, and is loaded with urate oxidase, ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate and crosslinking agents of glutaraldehyde. The preparation method of the enzyme membrane comprises the following steps that the nitrocellulose membrane is soaked into a PBS (phosphate buffer solution) and is then dried through being blown by N2; next, the nitrocellulose membrane is fixed by an O ring; the urate oxidase, glutaraldehyde and 1-butyl-3-methylimidazolium tetrafluoroborate solution is subjected to mixed crosslinking; next, a mixed solution is taken and is dripped and coated onto the nitrocellulose membrane; after the drying, the enzyme membrane provided by the invention is obtained. The ionic liquid modified urate oxidase enzyme membrane has the advantages that the ionic liquid effectively improves the electric conductivity of the enzyme membrane; the current response time is shortened; the enzyme membrane is used for uric acid detection, and has the advantages of wide linear range, high sensitivity and good stability; in addition, the method is simple; the implementation is easy; the cost is low.

The invention provides a method for preparing a Dy-Ni alloy film through low temperature electrodeposition. 1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-3-methylimidazolium hexafluorophosphate are mixed according to a mass percent ratio and used as molten salt. The molten salt is heated to 30 to 60 DEG C. A solute is added to the molten salt under stirring, and then stirred for 6 to 8h to acquire molten salt intermediate liquid. Finally, a Pt piece is used as an inert anode, and a high pure copper piece is used a cathode. The molten salt intermediate liquid is electrified for electrolysis, and the current density is controlled to be 0.01 to 0.1 A/cm<2> during electrolysis. The electrolysis time is 1 to 2 h. The Dy-Ni alloy film is acquired on the surface of the cathode. The method provided by the invention has the advantages of simple equipment, low energy consumption, low cost, simple operation, short preparation time, easy control of the thickness range and the like.