Table 1.

The results of Boehm titration.

Sample	Functional Groups
	Acidic Sites (mmol/g)				Basic Sites (mmol/g)
	Carboxylic	Lactonic	Phenolic	Total acidity
pMWCNTs	0.03	0.01	0.81	0.85	-
fMWCNTs	0.45	0.02	1.85	2.32	-