Abstract:

In order to investigate the adsorption capability of trichloromethane on activated carbons,the breakthrough curves of the fixed-bed adsorption of trichloromethane on three kinds of commercial activated carbons were measured,and the pore structures and specific surface areas of the activated carbons were characterized.Moreover,the effects of operation conditions and pore structures on the adsorption capacities of trichloromethane on the commercial activated carbons were discussed.Experimental results indicate that the breakthrough time prolongs not only with the decrease in the trichloromethane inlet concentration and the adsorption temperature but also with the increase in the loading length of the fixed bed, that both the BET specific surface area and total pore volume of the activated carbons decrease in the order of SY-9 〉 Tianda 〉 SY-16, that the adsorption capacities of trichloromethane on SY-9 and Tianda activated carbons are respectively 1.80 and 1.43 times that on SY-16 activated carbon when the adsorption performs at 298.15 K with a trichloromethane inlet concentration of 9. 497 g/m³, an adsorption column length of 2.4 cm and a line speed of carrier gas of 15.28 m/min, and that the ratio of adsorption capacities is similar to that of specific surface areas, meaning that trichloromethane is mainly adsorbed in the micropores of the activated carbons.

Key words: trichloromethane, activated carbon, adsorption breakthrough curve, pore structure