Surface Modification Effects on CNTs Adsorption of Methylene Blue and Phenol

Table 4

Boehm titration method.

CNTs	Carboxyl (mmol/g)	Lactones (mmol/g)	Phenols (mmol/g)	Total acidity (mmol/g)	Total basicity (mmol/g)
CNT-A (as synthesized)	0.1680	0.1530	0.3970	0.7188	0.0199
CNT-E (as synthesized)	0.1970	0.0590	0.4640	0.7200	0.0192
CNT-A (AM)	0.2519	0.1963	0.5931	1.0413	0.0144
CNT-A (HM)	0.0123	0.0139	0.0176	0.0438	0.0562
CNT-E (AM)	0.2774	0.1705	0.5621	1.0100	0.0164
CNT-E (HM)	0.0226	0.0250	0.0061	0.0538	0.0616