Table 4.

Boehm titration with different modified power levels (unit: Mmol/g).

Sample	Acid Functional Groups	Basic Functional Groups	Phenolic Hydroxyl Groups	Carboxyl
30 W	0.1700	2.3800	0.0054	0.0076
60 W	0.4500	2.8000	0.0035	0.0033
90 W	0.1000	2.4500	0.0000	0.0170