聚丙烯腈(PAN-polyacrylonitrile)活性炭纤维(ACF-Activatedcarbonfiber)经浸渍处理后，通过低温氮气吸附法测定了其吸附等温线，并通过BET方法计算了比表面积SBET，用Dubinin-Astakhov方程计算了微孔表面积Smic和微孔容积Vmic，用Horvath-Kawazoe方程计算了微孔容积Vmic和平均孔径D-。发现处理后样品的比表面积、微孔容积均小于未经处理的原样。而其对甲醛的静态与动态吸附容量都大于未经过处理的原样品。比表面积太小的样品对甲醛的吸附容量小于较高比表面积的样品的吸附容量。部分被吸附物于150?℃不能够完全脱除，经推知，所发生的吸附既有物理吸附又有化学吸附，是其表面官能团与孔结构共同作用的结果。样品的元素分析结果表明，处理后样品的C、N含量均增加，O含量降低，吸附过程中含N官能团的作用较显著。浸渍后的样品经热处理，其吸附容量高于未经热处理的样品，说明热处理可以脱除样品表面的杂原子而在PAN-ACFs表面留下许多活性位。
Adsorption of formaldehyde on PAN-ACFs modified by solutionimpregnation was investigated. Nitrogen adsorption isotherms were determined. It was found that the BET surface area and micropore volume of modified ACF decreased, while the adsorption capacity of formaldehyde increased. In addition, the sample ACF1 with low specific surface area had lower formaldehyde adsorption capacity than that of ACF2 with relatively high specific surface area. The adsorbed formaldehyde couldn't be removed at the temperature lower than 150?℃. It was conferred that the adsorption behavior was controlled by both surface functional groups and pore structure of ACF. The elemental analysis showed that the content of C and N in modified samples increased, while the content of O decreased, which illustrated that nitrogen functional groups played an important role in formaldehyde adsorption. After post heat treatment, adsorption capacity of formaldehyde on samples ACF1 and ACF2 both increased, which showed that heat treatment can increase active sites on ACFs by removing heteroatoms.
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