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Table 3 Parameters of different linear and nonlinear isotherms for Cr(VI) adsorption on PSD at 298 K

From: Adsorption behavior of Cr(VI) by biomass-based adsorbent functionalized with deep eutectic solvents (DESs)

Isotherm Parameters
Langmuir Linear form
qm/mg g−1 KL/mg L−1 RL R2
5.84 3.92 0.07 0.999
Nonlinear form
qm/mg g−1 KL/mg L−1 RL R2
5.77 3.84 0.07 0.9918
Freundlich Linear form
KF/mg g−1 n   R2
1.33 2.32   0.9786
Nonlinear form
KF/mg g−1 n   R2
1.5 2.66   0.9618
Temkin–Pyzhev Linear form
bT/kJ mol−1 A/L mg−1   R2
2.12 2.93   0.9948
Nonlinear form
bT/kJ mol−1 A/L mg−1   R2
2.12 2.93   0.9897
Dubinin–Radushkevich Linear form
E/kJ mol−1 qm/mg g−1   R2
1.22 3.73   0.885
Nonlinear form
E/kJ mol−1 qm/mg g−1   R2
2.65 4.72   0.9028