Table 7 Isotherms model parameters for the removal of Cu (II) ions from aqueous solution by CWF compositions

Freundlich

 1/n

1.44691

1.00805

1.46828

1.45494

0.90148

 n

0.690

0.990

0.680

0.690

1.109

 K_f (mg/g)

0.01738

0.05820

0.00336

0.00394

0.13113

 R²

0.88262

0.86132

0.98793

0.86584

0.95995

Langmuir

 b(l/mg)

0.00076

3.77 × 10^–5

0.00078

0.00079

0.00026

 A_s (mg/g)

223.705

1585.47

47.6615

50.2982

307.035

 R²

0.432299

0.00116

0.79761

0.39044

0.16388

Temkin

 A (l/mg)

191.162

138.960

191.013

0.00534

0.00884

 B (Kcal/mol)

0.004008

0.0247

0.0186

0.01766

0.02515

 dQ

147.753

24.1007

31.8833

33.6427

23.6235

 R²

0.80928

0.79003

0.99689

0.69123

0.69123