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Parameters of Langmuir and Freundlich adsorption isotherms for Zn and Cd in mono-metal and binary-metal systems.

 
Metal ion System Freundlich isotherm
Langmuir isotherm
Q0bin/Q0mon
KF N R2 Q0 b R2
L kg−1 mmol kg−1 L mmol−1
Zn mono-metal 366.9 0.4 0.98 298.2 19.0 0.94
binary-metal 241.1 0.3 0.96 187.4 47.7 0.90 0.63
Cd mono-metal 75.8 0.3 0.92 73.4 18.0 0.97
binary-metal 51.9 0.2 0.91 44.0 32.5 0.94 0.60



View Full Table | Close Full ViewTable 2.

Parameters of Langmuir and Freundlich adsorption isotherms for PO4, citrate, and humic acid in the absence of metals and in mono-metal, and binary-metal systems.

 
Metal ion System Freundlich isotherm
Langmuir isotherm
KF N R2 Q0 b R2
L kg−1 mmol kg−1 L mmol−1
PO4 absence of metals 999.4 0.28 0.86 983.6 1.66 0.93
Zn mono-metal 1030.0 0.12 0.93 939.0 1129.1 0.98
Cd mono-metal 1047.6 0.14 0.93 954.7 355.6 1.00
binary-metal 1757.6 0.13 0.86 1557.9 2712.5 0.99
Citrate absence of metals 157.2 0.21 0.82 171.0 11.8 0.89
Zn mono-metal 326.3 0.21 0.96 352.2 12.4 0.97
Cd mono-metal 191.3 0.12 0.98 208.0 16.6 1.00
binary-metal 243.8 0.21 0.98 280.0 8.8 0.98
Humic acid absence of metals 1.13 × 105 mg kg−1 0.06 0.93