The Boehm titration method [16] was used to determine the amount
of surface functional groups. For this purpose, 0.25 g of samples was
placed in 25 mL of 0.05 N solutions of hydrochloric acid, sodium hydroxide,
sodium carbonate and sodium hydrocarbonate, for 48 h. Then, each
solution was titrated with HCl or NaOH. The number of acidic groups
was determined on the assumption that NaOH neutralizes carboxyl,
phenol and lactone groups.
The Boehm titration method [16] was used to determine the amountof surface functional groups. For this purpose, 0.25 g of samples wasplaced in 25 mL of 0.05 N solutions of hydrochloric acid, sodium hydroxide,sodium carbonate and sodium hydrocarbonate, for 48 h. Then, eachsolution was titrated with HCl or NaOH. The number of acidic groupswas determined on the assumption that NaOH neutralizes carboxyl,phenol and lactone groups.
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