Research Article
Valorization of Wasted Black Tea as a Low-Cost Adsorbent for Nickel and Zinc Removal from Aqueous Solution
Table 2
Hydrolysis constants (
) and pH of Ni
2+ and Zn
2+ species.
| | Zn2+ species | | pH | Ni2+ species | | pH |
| | Zn(OH)2 | −16.4 | 8.3 | Ni(OH)2 | −20.01 | 7.1 | | Zn(OH) | −41.3 | 5.5 | Ni(OH) | −45.0 | 4.5 | | Zn2(OH) | −54.3 | 6.5 | Ni2OH+3 | −9.8 | 10.5 | | Zn2OH+3 | −9.0 | 10.8 | Ni4(OH) | −27.9 | 9.9 | | Zn4(OH) | −27.0 | 10.3 | NiOH+ | −9.5 | 5.3 | | ZnOH+ | −7.5 | 10.2 | | | |
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