Abstract
In this paper, the heavy metal ion adsorption behavior in coal tar pitch-based activated carbon fibers (ACFs) during physical activation is presented. N2 adsorption iso- therms at 77 K were examined using Brunauer-Emmett-Teller (BET), Horvath-Kawazoe (H- K), and Barret-Joyner-Halenda (BJH) methods to characterize specific surface area, pore vol- ume, and pore size distribution. The removal of heavy metal ions from ACFs was confirmed by atomic absorption spectroscopy (AAS). Experimental results for the ACFs showed a type I isothermal adsorption curve, which confirmed that the created pores were mostly micro- porous. After a 40-min steam activation, the fibers showed a high specific surface area of 1,693 m 2 /g. In addition, all heavy metal ions in the ACFs were adsorbed after about 20 min, and the adsorption reached equilibrium within 1 h. It was found that the adsorption capac- ity of the ACFs was improved by the presence of micropores but was also dependent on the specific surface area of the ACF.
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