Research Article
Effect of Physical and Chemical Activation on the Removal of Hexavalent Chromium Ions Using Palm Tree Branches
Table 2
Equilibrium isotherm constants of Cr(VI) adsorption onto raw and different activated adsorbents.
| Model | | Adsorbents | | RPB | APBH 20 | APBH 50 | APBS | APBK |
| Langmuir | | 25 | 37 | 59 | 20 | 50 | | 0.023 | 0.037 | 0.037 | 0.031 | 0.023 | | 0.99 | 0.99 | 0.98 | 0.99 | 0.98 |
| Freundlich | | 0.23 | 2.3 | 4.5 | 2.7 | 6.02 | | 1.03 | 1.05 | 1.1 | 1.75 | 1.14 | | 0.91 | 0.93 | 0.92 | 0.93 | 0.92 |
| Flory-Huggins | | 0.02 | 0.017 | 0.027 | 0.019 | 0.045 | | 3.4 | 0.79 | 1.5 | 1.2 | 1.68 | | 0.91 | 0.90 | 0.90 | 0.92 | 0.92 | | −32.2 | −31.1 | −32.7 | −33.0 | −34.8 |
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