Abstract
Activated carbon and bamboo charcoal were modified by the liquid phase oxidation using (NH4) 2S2O8 and the ammonia adsorption properties were investigated. The amount of acidic functional groups on activated carbon increased with treatment time in (NH4) 2S2O8 solution. The introduction of acidic functional groups caused an increase of the amount of chemisorbed ammonia as well as the improvement of physisorption properties at low relative pressures. The bamboo charcoal showed higher potential of ammonia physisorption than the activated carbon, though the ammonia adsorption ability was unchanged by liquid phase oxidation because acidic functional groups were hardly introduced on the surface.
