聚合物碳化制备高比表面积微孔炭材料及其CO_2吸附性能

High-surface-area microporous carbons derived from polymers carbonization and their CO_2 adsorption properties

以商业化副产物聚偏二氯乙烯(PVDC)树脂粉末为碳源制备炭材料并研究了298 K时CO_2的吸附性能.研究结果表明,PVDC树脂直接碳化得到比表面积为1220 m^2·g^(-1)且孔径小于1.5 nm的纯微孔炭材料,CO_2在1 bar下的吸附量高达3.97 mmol·g^(-1).在此基础上用KOH对微孔炭材料进行活化处理,发现KOH活化在增大炭材料比表面积的同时能保持高微孔率,但1 bar下的CO_2吸附量适度降低.高压下CO_2吸附量与炭材料的比表面积呈正比,20 bar时在比表面积为2150 m^2·g^(-1)样品上的吸附量为18.27 mmol·g^(-1),这与其他类型高比表面积吸附剂相比都处于较高水平.

Porous carbons were prepared from the waste commercial byproduct of poly（ vinylidene chloride） resin powders,and the corresponding CO_2 adsorption properties at 298 K were studied. The results indicated that carbons with surface areas of 1220 m^2·g^（-1）were obtained through direct carbonization and all pores were less than 1. 5 nm,showing high CO_2 uptake of 3. 97 mmol·g^（-1）at 1 bar. KOH activation was applied to adjust pore structure and this process greatly enhanced the surface area and retained high porosity in the resulting carbons. However,CO_2 uptake at 1 bar was slightly lowered in activated carbons compared with pristine one and uptake at high pressure was proportional to surface area. The carbon with surface area of 2150 m^2·g^（-1）has CO_2 uptake up to 18.27 mmol·g^（-1）at 20 bar,larger than many other related porous adsorbents.