Table 4 Adsorption parameters for Cu(II), Zn(II), Cd(II), and Pb(II) ions sorption on ST20 and ST20-ALG obtained from LM, FM, and D-RM
From: Titania-Coated Silica Alone and Modified by Sodium Alginate as Sorbents for Heavy Metal Ions
Isotherm | Parameters | Cu(II) | Zn(II) | Cd(II) | Pb(II) |
---|---|---|---|---|---|
ST20 | |||||
LM | qe (mg g−1) | 20.26 | 17.63 | 16.73 | 26.89 |
KL (L mg− 1) | 0.056 | 0.065 | 0.049 | 0.184 | |
R 2 | 0.9999 | 0.9998 | 0.9992 | 0.9999 | |
FM | KF (mg g−1) | 4.12 | 6.25 | 2.73 | 6.82 |
n | 3.266 | 5.301 | 3.431 | 4.609 | |
R 2 | 0.9657 | 0.9563 | 0.9388 | 0.9551 | |
D-RM | KDR (mg g−1) | 0.001 | 0.011 | 0.001 | 0.002 |
E (kJ mol−1) | 11.794 | 13.009 | 11.408 | 13.077 | |
R 2 | 0.9825 | 0.9847 | 0.9900 | 0.8021 | |
ST20-ALG | |||||
LM | qe (mg g−1) | 22.44 | 19.95 | 18.85 | 32.49 |
KL ((L mg−1) | 0.027 | 0.044 | 0.123 | 0.227 | |
R 2 | 1.0000 | 0.9999 | 0.9999 | 0.9999 | |
FM | KF (mg g−1) | 4.12 | 5.12 | 3.33 | 9.54 |
n | 3.113 | 4.224 | 2.551 | 3.789 | |
R 2 | 0.9612 | 0.9222 | 0.9439 | 0.9472 | |
D-RM | KDR (mg g−1) | 0.002 | 0.002 | 0.001 | 0.001 |
E (kJ mol−1) | 11.247 | 12.778 | 11.333 | 15.651 | |
R 2 | 0.9001 | 0.9873 | 0.9355 | 0.9982 |