Table 3.
Values for the constants of the isothermal models used to fit the experimental data on the adsorption of p-nitrophenol on biochar samples prepared at different pyrolysis temperatures.
| Sample | PC300 | PC400 | PC500 | PC600 | PC700 | |
|---|---|---|---|---|---|---|
| Langmuir | KL | 0.047 | 0.109 | 0.226 | 0.196 | 0.129 |
| Qm | 29.166 | 60.348 | 106.789 | 111.713 | 117.165 | |
| R2 | 0.981 | 0.963 | 0.957 | 0.946 | 0.946 | |
| SSE | 0.622 | 2.724 | 3.687 | 5.163 | 5.320 | |
| Freundlich | KF | 5.711 | 14.362 | 38.341 | 47.985 | 44.509 |
| n | 3.292 | 3.523 | 4.529 | 6.116 | 5.466 | |
| R2 | 0.935 | 0.944 | 0.968 | 0.995 | 0.997 | |
| SSE | 1.033 | 3.024 | 4.290 | 2.103 | 2.776 | |
| Temkin | bT | 446.028 | 245.158 | 180.739 | 217.648 | 217.489 |
| KT | 0.606 | 1.845 | 14.135 | 60.482 | 59.738 | |
| R2 | 0.988 | 0.986 | 0.958 | 0.944 | 0.873 | |
| SSE | 0.561 | 1.532 | 3.034 | 5.135 | 7.787 | |