268results about How to "High specific surface area" patented technology

Method for preparing nitrogen-doped activated carbon by utilizing PET (polyethylene terephthalate) waste material

ActiveCN103121678AHigh specific surface areaReasonable pore size distribution
The invention relates to a method for preparing nitrogen-doped activated carbon by utilizing a PET (polyethylene terephthalate) waste material and belongs to the technical fields of chemical industry and environmental protection. The method provided by the invention comprises that low-temperature preoxidized PET waste material and a nitrogen source are mixed, then carbonizing treatment is carried out in inert atmosphere, and activating treatment is carried out on carbonized product by adopting a physical activation method or a chemical activation method, so that the nitrogen-doped activated carbon is obtained. The method provided by the invention has the advantages that the PET waste material is taken as a carbon source, organic amine or inorganic ammonium salt is taken as the nitrogen source, and the characteristics of low production cost and simple preparation process are achieved; and the nitrogen-doped activated carbons with different nitrogen contents and specific surface areas can be prepared by controlling the ratio of the carbon source to the nitrogen source and selecting an appropriate activation method. The prepared nitrogen-doped activated carbon can serve as an electrode material, a catalyst carrier and an adsorbent. The invention provides a convenient and feasible method for utilizing the PET waste material.

Glucolase electrode based on magnetic carbon nano-tube and preparation method thereof

The invention belongs to the field of biological sensor technique, in particular to a glucolase electrode and a preparation method thereof on the basis of a magnetic carbon nano-tube. The preparation method of the invention disperses the carbon nano-tube ultrasonic into a chitosan acid aqueous solution containing ferric ions and ferrous ions so as to prepare the three-composition nanometer magnetic composite material which consists of the carbon nano-tube, ferroferric oxide and chitosan; the three-composition nanometer magnetic composite material is dispersed into glucose oxidase aqueous solution, adsorbs the glucolase and is dispersed into glutaraldehyde aqueous solution; by primary amino-group reaction crosslinking, the glucose oxidase is fixed on the surface of the magnetic composite material, thus obtaining the updatable glucolase electrode based on the magnetic carbon nano-tube; the glucolase electrode provided by the invention has high response speed, wide detection consistency range, simple and convenient electrode processing and simple and convenient preparation of the immobilized enzyme magnetic material; when the enzyme is deactivated, the electrode is regenerated by updating the enzyme material of the electrode surface based on the magnetic carbon nano-tube, therefore, the consumption of the electrode material is greatly reduced, the resource is saved and the cost of enzymatic determination is reduced.

Method for preparing composite carbon material with high specific surface area

InactiveCN102145884AAvoid deposition pluggingHigh specific surface area
The invention relates to a method for preparing a composite carbon material with a high specific surface area, which comprises the following steps of: after active carbon is impregnated into saturated aqueous solution of soluble metal salt, carrying out decompression and impregnation for 15 to 60 minutes in a sealed container; filtering and drying the obtained solution; processing the obtained product for 1 to 3 hours under the protection of nitrogen at a temperature of 400 to 600 DEG C and repeating the operation for 2 to 5 times to obtain an active carbon hole blocking material; carrying out impregnation coating of metal salt on the active carbon hole blocking material by solution of VIIIB metal salt; filtering and drying to obtain active carbon coated with a metal catalyst; carrying out vapor phase deposition on the active carbon coated with the metal catalyst to obtain a discharge material; immersing the discharge material in hydrochloric acid solution to remove the catalyst and a hole protective agent in a reaction product; in case of necessity, carrying out stirring or ultrasonic processing; filtering; washing the product into neutrality by de-ionized water; and drying to obtain the composite carbon material. The composite carbon material has the advantages of high specific surface area and high electrical conductivity.

Catalytic oxidation slow percolation nitrogen and phosphorus removal device and method

ActiveCN104193087AHigh specific surface areaEnhanced microbial adhesion
The invention discloses a catalytic oxidation slow percolation nitrogen and phosphorus removal device. According to the catalytic oxidation slow percolation nitrogen and phosphorus removal device, two stages of grillage machines are arranged above an unpowered biological rotating disc and biological filter integrated device, so as to form a high-level water inlet tube; flowing type molecular sieve packing is paved on the bottom of the high-level water inlet tube; a plurality of biological rotating discs are arranged above the flowing type molecular sieve packing; the biological rotating discs are divided into two zones A and B by a wall body; effluent of the zone B is introduced into an M-type constructed wetland; the M-type constructed wetland is internally divided into two zones by another wall body and is filled with a mixture of gravel and florida diatomite; the effluent of the M-type constructed wetland enters a surface turbulent flow screening device; a sludge discharge hole is formed in the bottom of a turbulent flow sand removal device; a stirring machine which is driven by a motor is arranged on the top of the turbulent flow sand removal device; and impellers of the stirring machine tilt upwards; sewage in a pond makes spiral movement when the impellers rotate. The invention further discloses a method for catalytic oxidation slow percolation nitrogen and phosphorus removal by using the catalytic oxidation slow percolation nitrogen and phosphorus removal device.

Preparation method of tungsten/copper layer composite material based on surface nanocrystallization of tungsten sheet

A preparation method of a tungsten/copper layer composite material based on surface nanocrystallization of a tungsten sheet is disclosed. The method includes performing surface pretreatment on the tungsten sheet; performing two steps of anodic oxidation and hydrogen reduction annealing in order to obtain a tungsten sheet having a deeply deoxygenated surface nanometer porous structure; electroplating the surface of the tungsten sheet having the nanometer porous structure with copper; and finally subjecting a tungsten/copper electroplated sample to high-temperature diffusion annealing to obtainthe tungsten/copper layer composite material. During preparation, the nanometer porous structure on the surface of the tungsten sheet can increase the contact area and improve surface activity, and can play a role of mechanically meshing a copper layer. A thermal shock method and a cross cut method are adopted to detect whether the copper metal layer shows peeling and shedding phenomena or not. The preparation method has characteristics of a simple process, a stable and pollution-free electroplating solution, a high connection efficiency, a low production cost, and good repeatability, can prepare a tungsten/copper material having a complex shape and based on the inner surface of a workpiece, avoid influences of metal middle layers on material performance, and facilitate industrial application of the tungsten/copper composite material.
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