Carbon

pH

pH_pzc

Acidic surface functional groups (mmol/g)

Carboxylic

Phenolic

Lactonic

Carbonylic

Total

CAK

5.3

7.5

1.43

0.16

0.07

0.25

1.91

CAN

4.8

6.7

1.57

0.21

0.07

0.36

2.21

CAC

5.1

6.9

1.38

0.23

0.06

0.28

1.95