Method for preparing nitrogen doped grading-hole porous carbon microspheres

Abstract

The invention discloses a method for preparing nitrogen doped porous carbon microspheres and belongs to the technical field of carbon materials. The method for preparing the nitrogen doped porous carbon microspheres comprises the following two steps of: 1, adding 20-50 mL of deionized water into a certain mass ratio of ammonium salt (such as ammonium chloride, ammonium sulfate or ammonium nitrate) and porous starch, carrying out magnetic stirring for 3-6 hours so that the ammonium salt is sufficiently adsorbed by the porous starch, then carrying out suction filtration and drying to obtain the porous starch with the ammonium salt; and 2, carbonizing the porous starch adsorbed with the ammonium salt for 2-6 hours at the temperature of 600-900 DEG C under the protection of inert atmosphere to obtain the nitrogen doped porous carbon microspheres. According to the invention, the used raw material in the method is the cheap and available commercialized porous starch; the nitrogen doped porous carbon microsphere is prepared on the basis that the original porous morphology of the porous starch is ensured, preparation process has no high requirement on equipment and is easy to operate, the preparation of the porous carbon microsphere which has a porous structure and is doped with nitrogen atoms is achieved by one step; and the material prepared by using the method has a potential application prospect in the fields of biological materials, catalysis, electrochemistry and the like.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-doped porous carbon microspheres, belonging to the technical field of carbon materials. Background technique [0002] The well-developed pore structure and rich surface chemical functional groups of carbon materials make them have broad application prospects in many fields. The traditional techniques for adjusting the structure and surface chemical properties of carbon material carriers have defects. How to create new carbon-based materials using cheap carbon sources, such as porous carbon doped with heteroatoms and whose pore structure and surface properties can be adjusted The material has attracted much attention at home and abroad. [0003] Starch or modified porous starch is a renewable natural carbon source that is widely available and inexpensive. In "Preparation Method of Starch-based Carbon Microspheres" (Patent No.: 200710150251), Wang Chengyang et al. used starch as a carbon source t...

AI Technical Summary

Problems solved by technology

The traditional techniques for regulating the structure and surface chemical properties of carbon material carriers have defects. How to create new carbon-based materials using cheap carbon sources, such as porous carbon doped with heteroatoms and whose pore structure and surface properties can be adjusted materials, attracting attention at home and abroad

However, there are no reports at home and abroad on the synthesis of porous carbon microspheres that use porous starch as a carbon source and use a simple process to achieve nitrogen atom doping in one step and have a porous structure.

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