Research Article
Removal of Heavy Metal Ions (Pb2+, Co2+, and Cd2+) by Activated Carbon from Cypress Fruit: An Investigation of Kinetics, Thermodynamics, and Isotherms
Table 4
Isotherm model constants.
| | Isotherm | Related isotherm constants | Metal ion | | Pb2+ | Co2+ | Cd2+ |
| | Langmuir | | 0.9971 | 0.9926 | 0.9951 | | 1.0725 | 0.1356 | 0.1624 | | , mg·g−1 | 84.15 | 79.16 | 61.32 |
| | Freundlich | | 0.9278 | 0.9851 | 0.9847 | | , mg·g−1 | 5.26 | 8.27 | 10.37 | | n | 5.0 | 2.0 | 2.0 |
| | D-R | | 0.7726 | 0.9621 | 0.9564 | | , mol2·kJ−2 | 4.0 × 10−4 | 4.40 × 10−3 | 3.50 × 10−3 | | E, kJ·mol−1 | 25.00 | 7.54 | 8.45 |
| | Temkin | | 0.9418 | 0.9935 | 0.9922 | | B | −6.037 | −14.00 | −25.68 | | A | 4.60 × 10−8 | 6.27 × 10−6 | 4.04 × 10−6 |
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