Two kinds of ultra-fine activated carbon fibers (UFACF-1 and UFACF-2) were prepared from ultra-fine preoxidized fiber mat via electric heating and microwave heating method, at the same relative humidity, the gaseous formaldehyde adsorption performance on the prepared ultra-fine activated carbon fibers was studied. The morphology and structural evolvement of ultra-fine preoxidized fiber during thermal treatment were characterized by field emission-scanning electron microscopy, FTIR spectroscopy and surface area and pore size analyses. UFACF-1 and UFACF-2 had differences in fiber morphology, structure and the formaldehyde adsorption performance, the surface area and the total pore volume of UFACF-1 were 805.25m2 · g-1 and 0. 366cm3 · g-1, and UFACF-2 were 733.32m2 · g-1 and 0. 386cm3 · g-1, respectively. UFACF-1 showed higher formaldehyde adsorption capacity than UFACF-2; UFACF-1 contained carbonyl and hydroxyl functional groups, which could have potential applications in removal of indoor formaldehyde.%以超细预氧化纤维毡为原料,采用电加热和微波加热方法制备两种超细活性碳纤维吸附剂(UFACF-1、UFACF-2),在相同湿度条件下,对两种超细活性碳纤维的甲醛吸附性能进行测定;采用场发射扫描电镜、傅里叶变换红外-拉曼光谱仪、全自动比表面和孔径分布分析仪对两种超细活性碳纤维吸附剂的纤维形态、结构、比表面积、孔容和孔径分布进行表征;两种超细活性碳纤维在纤维形态、结构和甲醛吸附性能上均有差别,其中,UFACF-1比表面积为805.25mz·g-1,总孔容为0.366cm3·g-1,UFACF-2比表面积为733.32m2·g-1,总孔容为0.386cm3·g-1,UFACF-1甲醛吸附性能优于UFACF-2;UFACF-1含有大量极微孔和含氧官能团,对于室内甲醛处理,是一种有应用潜力的新型吸附材料.
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