The purpose of this study was to determine the effects of surface-treatment by zinc salts on breakthrough and adsorption capacity of toluene. Firstly, the coconut activated carbon treated the surface with zinc salts, were exposed by the spike sample(toluene, 69.02ppm, 260.l ㎎/㎥), and then the effects of zinc salts were examines by using the gas adsorption kinetics.
The results obtained were as follows :
1) BET(Brumaure Emmett Teller) surface area were 954.4 ㎥/g in coconut activated carbon treated with 0.0001 N Zn(NO₃)₃6H₂O, and 830.3 ㎥/g in coconut activated carbon treated with 0.0001 N ZnCl₂.
2) Migration was decreased in coconut activated carbon treated with the thin level of zinc salts.
3) Breakthrough volume were 73.07 L in coconut activated carbon treated with 0.0001 N Zn(NO₃)₃6H₂O, and 72.76 L in charcoal treated with 0.0001 N ZnCl₂.
4) τ values(the time required for 50% breakthrough) were 1046.1 min in coconut activated carbon treated with 0.0001 N ZnCl₂ and 921.2 min in coconut activated carbon treated with 0.0001 N Zn(NO₃)₃6H₂O.
5) Maximum adsorption capacity was 53.9 ㎎/tube in coconut activated carbon treated with 0.0001 N ZnCl₂ and 47.4 ㎎/tube in coconut activated carbon treated with 0.0001 N Zn(NO₃)₃6H₂O.
In conclusion, the coconut activated carbon treated the surface with the thin concentration of zinc salts, decreased the breakthrough and increased the BET surface area and the adsorption capacity in case of sampling airborne toluene.
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