Table 2 Oxygen-containing functional groups of biochar (mmol g− 1).
From: Adsorption of copper(II) in biochar-humic acid–water system
alkali functional group | acidic functional group | carboxyl group | lactone group | phenolic hydroxyl group |
|---|---|---|---|---|
3.64 | 3.29 | 1.38 | 1.67 | 0.24 |
