Abstract
The adsorption characteristics of ammonia on several kinds of plasma-treated activated carbon (PT-AC) prepared under different treatment conditions were investigated from the adsorption isotherms, characteristic energy, and isosteric differential heats of adsorption. The amount of acid functional groups of the Pt-ACs was increased by 8-70% compared to that of raw activated carbon (R-AC) by plasma treatment. The amount of acid functional groups on the Pt-ACs increased with increase in oxygen pressure, reached a maximum at a pressure of 1.0 Torr and then decreased. The adsorption capacity, the characteristic energy, and the isosteric differential heats of adsorption for ammonia of No. 4 (treated at 1.5 Torr) were the greatest among the PT-ACs and R-AC. From the characteristic energy and heat of adsorption, it appeared that the acid functional groups were formed by the oxygen plasma treatment into micropores and supermicropores of activated carbon. it is concluded that the treatment conditions of No. 4 produced a characteristic adsorbent material having the greatest adsorption capacity for ammonia among the PT-ACs.
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