Adsorption parameters and results for adsorption isotherm models
Model | Parameter | 4°C | 25°C | 37°C |
---|---|---|---|---|
Langmuir | qm (mg mg–1) | 0.0043 ± 0.0004 (R2 = 0.7863) | 0.0045 ± 0.0002 (R2 = 0.9432) | 0.0236 ± 0.0169 (R2 = 0.9617) |
Ka (L mmol–1) | 0.0314 ± 0.0126 | 0.1013 ± 0.0115 | 0.8702 ± 0.7818 | |
Freundlich | KF (L g–1) | 0.0064 ± 0.0010 | 0.0047 ± 0.0002 | 0.0195 ± 0.0036 |
n | 0.3652 ± 0.0824 | 0.3615 ± 0.0258 | 0.9347 ± 0.1200 | |
Dubinin-Radushkevich | qDR (μmol g–1) | 8,882 ± 801.8 | 8,236 ± 210.0 | 12,613 ± 2,553.0 |
KDR (mol2 k–1J–2) | 0.0113 ± 0.0025 | 0.0184 ± 0.0011 | 0.0256 ± 0.0089 | |
Temkin | KT (mL mg–1) | 1,782 ± 253.6 | 1,555 ± 79.4 | 2,400 ± 400.1 |
b (J mol–1) | 268.9 ± 123.5 | 178.5 ± 31.0 | 112.0 ± 44.4 |
qm: maximum adsorption capacity; Ka: Langmuir constant; KF: adsorption capacity constant; n: heterogeneity factor; qDR: Dubinin-Radushkevich maximum adsorption capacity; KDR: Dubinin-Radushkevich isotherm constant; KT: equilibrium binding constant; b: Temkin constant