Table 1 Isothermal adsorption model parameters for Cu2+ adsorption.
From: Heavy metal removal by hydrogel synthesized from rice bran/acrylic acid/sodium alginate
Ion | Models | Parameters | T(℃) | |||
|---|---|---|---|---|---|---|
30 | 40 | 50 | 60 | |||
Cu2+ | Langmuir | qm (mg/g) | 26.50 | 26.48 | 26.06 | 25.78 |
KL | 0.0469 | 0.0346 | 0.0295 | 0.0289 | ||
R2 | 0.9971 | 0.9933 | 0.9663 | 0.9651 | ||
RL | 0.1783 | 0.2339 | 0.2525 | 0.2569 | ||
Freundlich | n | 4.84 | 4.843 | 5.82 | 5.56 | |
KF | 7.74 | 7.42 | 8.59 | 8.13 | ||
R2 | 0.9856 | 0.9855 | 0.9007 | 0.9038 | ||
Duinin-Radushkevich | qm (mg/g) | 23.33 | 22.21 | 21.45 | 21.54 | |
Ea (kJ/mol) | 0.17 | 0.16 | 0.16 | 0.15 | ||
R2 | 0.8716 | 0.7086 | 0.6176 | 0.6743 | ||
