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Table 2 Isotherm constants for the adsorption of Cd(II) ions and RY4 dye onto BMDA

From: Simultaneous removals of cadmium(II) ions and reactive yellow 4 dye from aqueous solution by bone meal-derived apatite: kinetics, equilibrium and thermodynamic evaluations

IsothermsParameterCd(II)RY4
LangmuirQmax (mg g−1)116.1694.85
b (L mg−1)0.1670.035
RL0.0560.209
R20.9860.988
FreundlichKF ×  102 ((mol g−1) (mol L−1)- 1/n36.1516.32
N3.963.03
R20.9640.985
TempkinaT (L mg−1)117.76138.99
bT2.250.604
R20.9750.987
Dubinin-RadushkevichQs (mg g−1)103.4365.95
β × 106 (mol J−1)22.977.51
E (kJ mol−1)410.30258.03
R20.9980.971