Activated carbon was treated with various acids (CH3COOH, HNO3, HCI, H2SO4, H3PO4), to remove ammonia efficiently. The surface area, pore volume, and average pore size of modified activated carbons was investigated by means of adsorption experiments w...
Activated carbon was treated with various acids (CH3COOH, HNO3, HCI, H2SO4, H3PO4), to remove ammonia efficiently. The surface area, pore volume, and average pore size of modified activated carbons was investigated by means of adsorption experiments with nitrogen gas. Surface states of modified activated carbons observed by SEM. Functional groups on the surface of phosphoric acid were analyzed from FT-IR spectra. Removal performance was calculated on basis of breakthrough curves obtained from a flow system under atmospheric pressure. The surface area and pore volume of modified activated carbons were greatly varied with type of acids. The surface area and pore volume of activated carbons modified with phosphoric acid was decreased with increasing the modified contents. The amounts of ammonia adsorbed were depended on the functional groups formed chemically on the surface by the modification with phosphoric acid. Activated carbon modified with phosphoric acid of 20wt% showed the maximum amount of ammonia ad orbed was obtained.