The characterization results discussed above were further
examined by adsorption study of the nitrite ion. The values of nitrite
removal percent from originally contaminated nitrite aqueous
solutions (20 mg/L) using a constant pH value at 25 C, after 60 min,
were calculated. Within the specified time, the ZnCl2/450-AC was
much more effective in removing the nitrite ions than either the
H3PO4/450-AC or the OSC.