Nitrogen-Doped Carbonaceous Materials for Removal of Phenol from Aqueous Solutions

Table 1

Acid-base properties of investigated adsorbents (m mol/g) and nitrogen content (wt.%).

Sample	N	Acidic groups	Basic groups	Total content of surface oxides	pH
BK	0.0	0.84	0.12	0.96	6.1
BKN	9.8	1.04	1.12	2.16	6.3
BKNA	1.6	1.39	1.23	2.62	7.2
BK(NO)	3.9	1.52	1.13	2.65	5.9
BK(NO)A	1.4	1.26	1.55	2.81	8.4