The types and amounts of surface functional groups that present
in the activated carbon samples were determined by the Boehm
analysis and the results were given in Table 5. The amounts
of carboxylic, lactonic and phenolic groups were determined
by neutralizing them with basic solutions having different base
strengths such as, NaHCO3, Na2CO3, NaOH, and C2H5ONa. The basic
group content was determined by the method of titration with
HCl.