Table 1.
System | Metals | pH | Langmuir | Freundlich | ||||
---|---|---|---|---|---|---|---|---|
q max a | k L b | R 2 | k F c | 1/n d | R 2 | |||
Single metal | Cu(II) | 4.0 | 6.24 ± 0.21e | 0.13 ± 0.01e | 0.998 | 0.96 ± 0.08e | 0.55 ± 0.03e | 0.992 |
Pb(II) | 15.48 ± 0.95 | 0.63 ± 0.17 | 0.981 | 5.91 ± 0.29 | 0.37 ± 0.02 | 0.991 | ||
Cd(II) | 1.28 ± 0.03 | 0.14 ± 0.01 | 0.999 | 0.21 ± 0.02 | 0.52 ± 0.04 | 0.985 | ||
Cu(II) | 6.0 | 23.09 ± 1.45 | 0.59 ± 0.14 | 0.987 | 8.59 ± 0.42 | 0.39 ± 0.03 | 0.993 | |
Pb(II) | 38.50 ± 3.16 | 4.62 ± 1.72 | 0.963 | 27.97 ± 1.28 | 0.31 ± 0.04 | 0.967 | ||
Cd(II) | 4.41 ± 0.19 | 0.64 ± 0.12 | 0.981 | 1.89 ± 0.29 | 0.29 ± 0.07 | 0.856 | ||
Cu(II) | 7.0 | 59.44 ± 3.64 | 3.47 ± 0.54 | 0.991 | 48.43 ± 1.91 | 0.46 ± 0.04 | 0.982 | |
Pb(II) | 81.49 ± 9.94 | 8.41 ± 1.97 | 0.992 | 151.17 ± 31.26 | 0.63 ± 0.09 | 0.96 | ||
Cd(II) | 9.92 ± 0.55 | 0.69 ± 0.18 | 0.974 | 4.18 ± 0.59 | 0.31 ± 0.06 | 0.899 | ||
| ||||||||
Multimetal | Cu(II) | 4.0 | 4.33 ± 0.08 | 0.16 ± 0.01 | 0.999 | 0.77 ± 0.10 | 0.53 ± 0.05 | 0.977 |
Pb(II) | 10.27 ± 0.72 | 0.73 ± 0.25 | 0.967 | 4.41 ± 0.39 | 0.32 ± 0.04 | 0.964 | ||
Cd(II) | 4.59 ± 0.15 | 0.11 ± 0.01 | 0.999 | 0.58 ± 0.07 | 0.60 ± 0.05 | 0.984 | ||
Cu(II) | 6.0 | 18.37 ± 1.07 | 1.36 ± 0.44 | 0.975 | 9.36 ± 0.87 | 0.30 ± 0.05 | 0.945 | |
Pb(II) | 27.71 ± 1.19 | 7.05 ± 2.00 | 0.980 | 20.45 ± 1.18 | 0.22 ± 0.04 | 0.942 | ||
Cd(II) | 5.34 ± 0.21 | 0.24 ± 0.03 | 0.996 | 1.26 ± 0.08 | 0.47 ± 0.03 | 0.992 | ||
Cu(II) | 7.0 | 46.77 ± 0.96 | 4.04 ± 0.26 | 0.998 | 36.13 ± 2.07 | 0.39 ± 0.06 | 0.951 | |
Pb(II) | 43.03 ± 4.83 | 64.84 ± 33.86 | 0.911 | 50.63 ± 2.07 | 0.17 ± 0.02 | 0.981 | ||
Cd(II) | 6.78 ± 0.32 | 0.98 ± 0.24 | 0.976 | 3.12 ± 0.21 | 0.31 ± 0.03 | 0.975 |
aMaximum adsorption capacity estimated by Langmuir isotherm model (mg g−1).
bAdsorption affinity estimated by Langmuir isotherm model (L mg−1).
cFreundlich model capacity ((mg/g) (L/mg)1/n).
dFreundlich model site heterogeneity factor (dimensionless).
eStandard errors.