Adsorption of Volatile Organic Compounds on Activated Carbon Fiber Preparedby Carbon Dioxide

Viscose rayon fabric impregnated with (NH 4 ) 2 HPO 4 were carbonized in 200 cm 3 /min N 2 at 5°C/min with a residence time of 1 h at 850°C and then activated with 200 cm 3 /min CO 2 at 850°C for different burnoffs. The pore structure of all samples was characterized by N 2 adsorption at 77 K. Adsorption of methy-ethyl-ketone (MEK) and benzene vapor on the adsorbents was measured by gravimetric method. The results show that viscose rayon-based activated carbon fiber (ACF) exhibited narrower microporosity and higher micropore volume as compared with that activated by steam. ACFs prepared in this way have higher adsorption capacity for low concentration VOCs.