Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method for porous carbon spheres

A porous carbon, high-temperature carbonization technology, applied in the field of nanomaterials, can solve the problems of carbon spheres without further carbonization, harsh conditions, non-uniformity, etc.

Inactive Publication Date: 2013-04-17
PEKING UNIV SHENZHEN GRADUATE SCHOOL
View PDF5 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art discloses a variety of preparation methods for porous carbon sphere materials, mainly template methods, including hard template methods and soft template methods, as well as hydrothermal methods, chemical vapor deposition, etc., but these methods have high costs and complicated operations , harsh conditions, low output, small particle size of the prepared carbon spheres, and very heterogeneous, poor dispersion and many other shortcomings, so its application is greatly restricted
[0004] For example, CN101181986A discloses a method for preparing micro-porous carbon spheres. The method uses porous starch as a carbon source precursor, and adopts a coating carbonization method to coat a protective layer on the surface of porous starch particles. Monodisperse micron-scale porous carbon microspheres are prepared, but the heat treatment temperature of this method is relatively high, which has certain limitations on the equipment, and uses tin-containing compounds as coating agents, which have certain toxicity to the human body and the environment, affecting other industrial application
CN101698479A discloses a method for preparing large-sized carbon spheres. In this method, micron-sized carbon spheres are obtained by adding zinc salt, and the diameter is between 5 and 10 μm. However, this method directly uses a mixed solution of zinc salt and glucose in water Thermal carbonization, the obtained carbon spheres have not been further carbonized, so the prepared porous carbon spheres have poor size uniformity and no hierarchical pore formation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for porous carbon spheres
  • Preparation method for porous carbon spheres
  • Preparation method for porous carbon spheres

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a preparation method of porous carbon spheres, comprising the following steps:

[0027] A) mixing and reacting the ethanol dispersion of porous polymer microspheres containing epoxy groups with an aqueous solution of meglumine to obtain functionalized porous polymer microspheres;

[0028] B) mixing and reacting the functionalized porous polymer microspheres obtained in step A) with an aqueous solution of carbohydrate compounds to obtain composite microspheres;

[0029] C) Carrying out high-temperature carbonization of the composite microspheres obtained in step B) in an inert gas to obtain porous carbon spheres.

[0030] The present invention uses micron-sized porous polymer microspheres containing epoxy groups as templates. After surface modification with meglumine, the pore structure of the templates is preserved, and a large number of hydroxyl groups are introduced into the surface, which can absorb carbohydrates such as water. The various lev...

Embodiment 1

[0055] Mix 600mL of water and 1g of sodium chloride in a 500mL three-neck round bottom flask, then add 70mL of styrene within 30min under nitrogen protection, heat the temperature of the reaction system to 60°C, add 0.7g of potassium persulfate, and stir for 24h. The polystyrene mixture was obtained, and the obtained mixture was centrifuged for 10 min. After repeated washing with water, the solid was dried overnight at 60° C. to obtain polymer microspheres.

[0056] The polymer microsphere 6.8g that obtains is dissolved in 77mL water, obtains polymer microsphere latex particle, then mixes with the emulsion that is formed by 77mL water, 13.5mL1-chlorododecane and 0.2g sodium lauryl sulfate, Then add 6mL of water and 18mL of acetone, stir and react at 40°C for 10h, remove the acetone by vacuum rotary evaporation after the reaction; then add 240g of glycidyl methacrylate and 160g of ethylene glycol dimethyl Acrylic acid ester, 400g diethyl phthalate and 1g benzoyl peroxide were a...

Embodiment 2

[0059] The porous macromolecule microsphere prepared by 10g embodiment 1 is ultrasonically dispersed in 100mL ethanol to obtain the dispersion liquid of porous macromolecule microsphere, simultaneously 20g meglumine is dissolved in 120mL deionized water to form meglumine aqueous solution, then porous high The dispersion of molecular microspheres and the meglumine aqueous solution were mixed evenly, stirred mechanically, and reacted at 60°C for 20 hours. After the reaction, the reaction system was cooled to room temperature, filtered with suction, and the solid was washed with deionized water and dried to obtain functionalized porous polymer microspheres.

[0060] Dissolve 8g of glucose in 25mL of deionized water to form a glucose aqueous solution, then add 1g of functionalized porous polymer microspheres, and ultrasonically disperse to obtain a mixed solution, then transfer the mixed solution into a reaction kettle, and keep it warm at 180°C for 24 hours, and the reaction is ov...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Concentrationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method for porous carbon spheres. The preparation method comprises the steps as follows: mixing and reacting an ethanol dispersion solution of porous polymer microspheres containing epoxy groups with a water solution of meglumine to obtain functionalized porous polymer microspheres; mixing and reacting the functionalized porous polymer microspheres with a water solution of carbohydrates to obtain composite microspheres; and carbonizing at a high temperature in inert gas to obtain the porous carbon spheres. According to the preparation method, the micron-sized porous polymer microspheres containing epoxy groups are adopted as templates, the pore structures of the templates are reserved after the templates are subjected to surface modification by meglumine, a large amount of hydroxyl groups are introduced into the surface and can be used for absorbing derived oligomers in the hydrothermal process of carbohydrates, carbohydrates are dehydrated, polymerized and aromatized in the pore canals and on the surfaces of the template spheres, carbohydrates are prevented from forming small spheres due to secondary nucleation, and the prepared porous carbon spheres are uniform in size and good in dispersity; and meanwhile, the pore diameters of the used porous polymer microsphere templates are subjected to ranked distribution, so that the prepared microspheres are provided with ranked pores.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method of porous carbon spheres. Background technique [0002] Carbon-based nanomaterials, especially porous carbon sphere materials, have high chemical stability, good high temperature resistance, large specific surface area, special pore structure, excellent mechanical properties, low density and good electrical conductivity Therefore, it has broad application prospects in the fields of gas adsorption, catalyst carrier, drug controlled release, hydrogen storage materials, fuel cells, etc., and has aroused great research interest. [0003] The prior art discloses a variety of preparation methods for porous carbon sphere materials, mainly template methods, including hard template methods and soft template methods, as well as hydrothermal methods, chemical vapor deposition, etc., but these methods have high costs and complicated operations , Harsh conditions, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B31/02C01B32/05
Inventor 王勇陈江来任连兵腾超江必旺赵劲
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL