31results about How to "Increased catalytic surface area" patented technology

The invention provides a heterogeneous catalyst and a method for preparing cyclocarbonate using the same. The heterogeneous catalyst comprises a main catalyst and a cocatalyst, wherein the main catalyst is filled with a reactor in a regular manner. The main catalyst is a crosslinked polymer containing a quaternary ammonium salt group, and the active site in the catalyst is a quaternary ammonium salt group, which is chemically bonded to the crosslinked polymer and has the characteristic of adjustable quantity; the cocatalyst has a molecular formula MxLy, and is a halogenated metal salt. The method for preparing cyclocarbonate by reacting CO2 with alkylene oxide using the heterogeneous catalyst has the advantages that the product is convenient to separate, the yield of cyclocarbonate is high, and the catalyst can be recycled.

The invention relates to a composite of decomposing organic phenol- containing waste water, namely a photocatalyst-Arcolitebased active carbon composite, as well as its preparing method. Its character: Arcolite 40-100 shares; photocatalyst 10-50 shares; active agent 20-100 shares. Its preparing method: (1) batching; (2) carbonizing: proportionally mixing powdery Arcolite and photocatalyst powder to finely mill, screening by 200-eye sieve, and then carbonizing into powdery carbon after 1-4 hours under the protection of nitrogen gas; (3) activating: fully mixing the powdery carbon with the active agent in the weight proportion to activate for 2-4 hours under the protection of nitrogen gas, cooling the product to fully wash by water to eliminate alkali component, and then drying to obtain the finished product. Under the action of ultraviolet ray, it can make high-efficiency decomposition on organic and harmful matters of organic phenol; its production process is simple and its production cost is low.

The invention discloses a microfluidic method capable of photodegrading dyes to prepare copper-loaded nano-titanium dioxide chitosan composite microspheres. Tetrabutyl titanate solution is added to an acidic solution and mixed to form a nano-titanium dioxide gel. The solvent mixes the nano-titanium dioxide gel with the amino-terminated hyperbranched polymer to obtain a mixed solution, and then adds a copper ion solution to the mixed solution, and after drying, the copper-loaded nano-titanium dioxide powder is obtained, and the copper-loaded nano-titanium dioxide powder and chitosan are added to the acidic The solution is mixed to obtain a dispersed phase, the sorbitan fatty acid ester is mixed with a hydrocarbon mixture to obtain a continuous phase, the dispersed phase and the continuous phase are mixed in a microfluidic manner, and dried to obtain copper-loaded nano titanium dioxide chitosan composite microspheres. The composite microsphere prepared by microfluidic control in the present invention has high material utilization rate, large catalytic surface area and high catalytic activity of the microsphere itself, can effectively reduce the concentration of dye, reduce toxic components in dye wastewater, and protect the environment and water resources.

The invention discloses a core-shell nano-composite material and its preparation method. The composite material is formed by compounding ammonium perchlorate (AP) and a nano-metal oxide which accounts for 0.1-10% by mass. The preparation comprises: (1) dissolving a metal salt in ethyl acetate, and conducting ultrasonic oscillation to make it fully dissolved so as to obtain a metal salt solution, in which the molar concentration of the metal salt is 0.0004-0.04mol / L; (2) adding ammonium perchlorate into the metal salt solution in an undissolved state, and carrying out stirring at room temperature so as to make the ammonium perchlorate dispersed uniformly; (3) using an alkaline solution with an OH<-> ion concentration of 0.1-1mol / L for titration at a constant speed so as to make the metal ions in the metal salt converted to a precipitate completely; and (4) filtering the obtained precipitate and conducting washing, and drying the obtained powder, thus obtaining the core-shell nano-composite material. The metal salt can be ZnCl2, FeCl3, Co(NO3)2.6H2O or CuCl2. In the invention, the dispersion problem of a nano-oxide catalyst in AP is solved; an oxide catalyst is generated on AP in situ, and the oxide content is adjustable; the nano-composite material of the invention has self-catalysis property, and the catalysis effect is substantial.

The invention discloses a graphite phase C 3 N 4 The preparation method of carbon nanotube composite counter electrode comprises the steps as follows: carbon nanotubes are added in cyandiamide or dicyandiamide solution, filtered after heating and refluxing, and dried to obtain cyanamide or dicyandiamide adsorbed on the surface Carbon nanotubes; put the prepared carbon nanotubes into a tube furnace, heat up, and heat-treat in a nitrogen atmosphere; cool to room temperature to obtain graphite phase C 3 N 4 / carbon nanotube composite material; mix the obtained composite material with solvent and additives to form a dispersion; apply the dispersion evenly to the surface of the electrode substrate to make the surface covered with graphite phase C 3 N 4 / The electrode substrate of the carbon nanotube composite film; the electrode substrate is dried under vacuum conditions to prepare the graphite phase C 3 N 4 / carbon nanotube composite counter electrode. The beneficial effect is: it is beneficial to the transfer of electrons; it can effectively reduce carbon nanotubes and graphite phase C 3 N 4 The aggregation increases its catalytic surface area. The preparation process is simple, does not require complex equipment, and is easy for industrial mass production.

The invention discloses a self-supporting material with a one-dimensional and two-dimensional hybrid structure for the positive electrode of a lithium-air battery and a preparation method thereof. Immerse the hydrophilic treated carbon nanotube sponge in the precursor solution of hydroxide, and shake to make the solution fully infiltrate the sponge; then transfer the solution and the sponge to the reactor for hydrothermal reaction; after the reaction, take out the sponge and wash it, After freeze-drying, a composite self-supporting material hybridized with one-dimensional carbon nanotubes and two-dimensional hydroxides was obtained. Using this material as a self-supporting cathode for lithium-air batteries can simultaneously achieve high-capacity, long-cycle electrochemical performance.

The invention discloses a method for preparing silver-loaded nano-titanium dioxide PVP fibers by photodegrading dye microfluidics. The tetrabutyl titanate solution is added to an acidic solution to form a nano-titanium dioxide gel, and an organic solvent is used to form a nano-titanium dioxide gel. Mix with amino-terminated hyperbranched polymer to obtain a mixed solution, then add silver ion solution to the mixed solution, and obtain silver-loaded nano-titanium dioxide powder after drying, mix silver-loaded nano-titanium dioxide powder and PVP powder in an organic solvent to obtain a microfluidic spinning Silk liquid, the microfluidic spinning liquid is spun into silver-loaded nano-titanium dioxide PVP fibers by microfluidic control. The preparation of the catalytic fiber in the present invention has high utilization rate of materials, large catalytic surface area and high catalytic activity of the fiber itself, can effectively reduce the concentration of dyes, reduce toxic components in dye wastewater, and protect the environment and water resources.

A Ti-based 3 C 2 A high-sensitivity LRSPR optical fiber sensor and a preparation method thereof belong to the technical field of sensors. Ti-based 3 C 2 The high-sensitivity LRSPR fiber optic sensor consists of Ti-based 3 C 2 High-sensitivity LRSPR fiber optic sensing unit, light source and spectrometer; based on Ti 3 C 2 The high-sensitivity LRSPR optical fiber sensing unit consists of a single-mode fiber core and a multimode fiber connected at both ends, and a matching layer, a metal layer and a Ti layer are arranged outside the single-mode fiber core. 3 C 2 Floor. Among them, the matching layer is coated on the outer layer of the single-mode fiber core by pulling coating, and the metal film is coated on the outside of the matching layer by magnetron sputtering. Ti 3 C 2 The layer is coated on the outside of the metal layer by electrostatic adsorption. This method utilizes Ti 3 C 2 Good optical properties greatly improve the sensitivity of fiber optic sensors and greatly increase the scope of application of biosensing.