Heavy metal ions adsorbed | Langmuir Isotherm | Dubinin-Radushkevich Isotherm | ||||||
Qmax mg/g | b | R2 | Qm (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 | |