Table 5 Parameters of pseudo-first-order and pseudo-second-order kinetic models, R2 and AARD for AB25 adsorption onto CSA and CSAH10 at various solution pH value - initial concentration 50 mg/l, adsorbent dosage 2 g/l, temperature 27 °C.
Solution pH | qe, exp (mg/g) | Pseudo-first-order model | Pseudo-second-order model | ||||||
|---|---|---|---|---|---|---|---|---|---|
K1 (1/min) | qe, cal (mg/g) | R2 | AARD% | K2 (g/mg min) | qe, cal (mg/g) | R2 | AARD% | ||
CSA | |||||||||
3 | 19.902 | 0.2382 | 19.435 | 0.9373 | 5.5217 | 0.0218 | 20.507 | 0.9782 | 3.6276 |
4 | 18.275 | 0.2445 | 17.824 | 0.9466 | 5.0781 | 0.0245 | 18.791 | 0.9805 | 3.4168 |
6 | 17.925 | 0.2579 | 17.364 | 0.9363 | 5.5301 | 0.0271 | 18.266 | 0.9756 | 3.8902 |
9 | 15.351 | 0.2019 | 14.879 | 0.9510 | 5.2622 | 0.0226 | 15.823 | 0.9822 | 3.4429 |
11 | 13.175 | 0.1834 | 12.853 | 0.9636 | 4.6370 | 0.0232 | 13.713 | 0.9838 | 2.5568 |
CSAH10 | |||||||||
3 | 23.450 | 0.5991 | 22.548 | 0.9501 | 4.5833 | 0.0471 | 23.440 | 0.9847 | 2.5569 |
4 | 20.950 | 0.3087 | 20.331 | 0.9390 | 5.4637 | 0.0274 | 21.347 | 0.9820 | 2.9847 |
6 | 19.975 | 0.3145 | 19.274 | 0.9316 | 5.8052 | 0.0297 | 20.227 | 0.9775 | 3.5145 |
9 | 18.150 | 0.2672 | 17.492 | 0.9375 | 5.9504 | 0.0266 | 18.459 | 0.9824 | 3.1315 |
11 | 15.125 | 0.2268 | 14.681 | 0.9492 | 5.0617 | 0.0267 | 15.538 | 0.9839 | 3.3137 |
