Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon

Table 4

Content of oxygen functional groups on the surface of BACs.

Sample	Carboxyl (mmol·g^−1)	Phenolic hydroxyl (mmol·g^−1)	Acidity (mmol·g^−1)	Basicity (mmol·g^−1)
BAC-0	0.1052	0.0585	0.1784	0.5875
BAC-N1	0.6095	0.0676	0.6917	0.2001
BAC-N2	0.6945	0.0607	0.7571	0.1792
BAC-N3	0.7032	0.0540	0.8589	0.1413
BAC-N4	0.7243	0.0674	0.8842	0.0986