Porous carbon composite material with core-shell structure as well as preparation method and application thereof

Abstract

The invention provides a porous carbon composite material with a core-shell structure. The porous carbon composite material comprises porous carbon particles and an inorganic porous layer coating the porous carbon particles. The invention also provides a preparation method of the porous carbon composite material; the preparation method comprises activation treatment, coating layer formation and carbonization treatment, wherein the coating layer formation step comprises the steps: firstly, providing a coating solution which comprises an inorganic layer precursor and a pore-forming agent which are uniformly mixed, and forming an inorganic gel coating layer on the surfaces of tobacco activated particles. In the carbonization treatment process, an inorganic gel layer becomes an inorganic porous layer, nicotine escaping from a tobacco material is bound before the inorganic porous layer is formed, carbonization of nicotine is promoted through the provided microenvironment, and the utilization rate of an endogenous nitrogen element and the yield of a carbon product in the preparation process of the tobacco-based carbon material are effectively increased. The invention also provides an application of the porous carbon composite material in cigarette filters, soil conditioners, water treatment adsorbents or electrodes.

Description

technical field

[0001] The invention relates to recycling of tobacco waste, in particular to a porous carbon composite material with a core-shell structure and its preparation method and application. Background technique

[0002] my country is a big tobacco country in the world, and its planting area, total output, cigarette output and sales volume all rank first in the world. A large amount of waste will inevitably be generated in the tobacco leaf and processing process. According to statistics, the tobacco stem produced in 2015 alone reached 1.163×10 6 Ton. Due to the relatively poor availability of tobacco stalks, most of them are disposed of by landfill or incineration, and the comprehensive utilization rate is extremely low, which not only causes environmental pollution, but also wastes a lot of existing resources.

[0003] Activated carbon is a kind of porous solid carbon material. Because of its developed pore structure and huge specific surface area, it has unique ...

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