Heavy metal ions adsorbed

Langmuir Isotherm

Dubinin-Radushkevich Isotherm

Q_max mg/g

b

R²

Q_m (mol/g)

β (mol²/J²)

E (kJ/mol)

R²

Nickel

142.857

65.8935

0.525

0.0071

1.00E−08

7.071068

0.993

Copper

−58.824

−312.8911

0.642

0.1397

1.00E−08

7.071068

0.979

Zinc

38.462

712.2507

0.858

0.0069

5.00E−09

10

0.94

Lead

166.667

550.0550

0.769

0.0087

7.00E−09

8.451543

0.988

Cadmium

33.333

86.3558

0.973

0.0016

5.00E−09

10

0.922

Chromium

−25.641

−180.5706

0.561

0.4131

1.00E−08

7.071068

0.958