Research Article
Recovery Process for Critical Metals: Selective Adsorption of Nickel(II) from Cobalt(II) at Acidic Condition and Elevated Temperature
Table 3
Correlation between proton release per adsorbed metal ion during adsorption and stability constant
at
°C in a single-component system.
| | Adsorptive |
(μmol·L-1) | Metal ion : ligand ratio
(μmol(M(II)) · μmol(Ligand)-1) | pHeq | Released H+ : adsorbed metal ion ratio
(μmol(H+) · μmol(M(II))-1) | |
| | None | 0 | — | 2.7 | — | — | | Ni(II) | 2800 | 1 : 2 | 2.0 | 3.65 | 4.30 | | Co(II) | 2800 | 1 : 2 | 2.3 | 2.54 | 2.71 | | Ni(II) | 5600 | 1 : 1 | 1.9 | 3.68 | 3.09 | | Co(II) | 5600 | 1 : 1 | 2.3 | 2.22 | 2.31 | | Ni(II) | 17000 | 3 : 1 | 1.8 | 4.14 | 2.32 | | Co(II) | 17000 | 3 : 1 | 2.2 | 2.33 | 1.84 |
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