Table 4 Kinetic parameters obtained from kinetic models for the adsorption of Cd(II) onto the four rice straw adsorbents.
Treatments | Temperature (K) | Lagergren’s pseudo-first order | Pseudo-second-order | ||||
|---|---|---|---|---|---|---|---|
qt (mg g−1) | k1 (min−1) | R2 | qt (mg g−1) | k2 (g mg−1 min−1) | R2 | ||
Sp | 298 | 3.4924 | 0.0071 | 0.6975 | 4.0576 | 0.0021 | 0.7732 |
308 | 6.0563 | 0.0348 | 0.6893 | 6.3764 | 0.0097 | 0.7482 | |
318 | 17.5582 | 0.0561 | 0.5047 | 18.4610 | 0.0050 | 0.6021 | |
Sa | 298 | 50.7966 | 0.0529 | 0.6981 | 53.7478 | 0.0015 | 0.8038 |
308 | 52.1946 | 0.0290 | 0.5632 | 55.0369 | 0.0010 | 0.7005 | |
318 | 56.2693 | 0.0356 | 0.4534 | 59.5281 | 0.0010 | 0.5978 | |
Sb | 298 | 3.9211 | 0.0009 | 0.8395 | 4.5635 | 0.0008 | 0.8805 |
308 | 10.4265 | 0.0093 | 0.6137 | 11.9465 | 0.0010 | 0.7123 | |
318 | 18.7622 | 0.0123 | 0.4801 | 19.9148 | 0.0029 | 0.6300 | |
Ms | 298 | 5.7334 | 0.0161 | 0.6294 | 6.4436 | 0.0031 | 0.7537 |
308 | 9.5123 | 0.0212 | 0.6846 | 10.1284 | 0.0036 | 0.7831 | |
318 | 18.6134 | 0.0239 | 0.4961 | 19.6157 | 0.0023 | 0.6240 | |
