| 초록 |
In recent year, activated carbon fibers (ACFs) have drawn great attention because of their superior performance as compared to other adsorbents. The adsorption properties of ACFs are essentially influenced by the surface structures. It has been recognized that Acfs contain micropores in a significant proportion, and these pores are dependent on the manufacturing conditions. These microporous fibers obtained by moderate activation possess a rather narrow pore size distribution, and their microporous structure might be considered to be practically homogeneous. During these adsorption studies, it was noted that the activation temperature significantly influences the adsorption properties of ACFs. In this work, a series of ACFs has been prepared by CO2 activation on oxidized PAN-based carbon fibers at 700, 800, 900 and 1,000℃ for 2 hrs. The ACFs showed different surface nature, specific surface area and porosity, depending on the activation temperature. Among the temperatures, at 1,000℃ for 2 hrs produced the most developed pore structure from each sample. Also, the activation temperatures influence the surface nature of the ACFs. When the temperature was less than 800℃, the surface of the samples was developed in acidic properties, but it was base at higher than 900℃.
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