Table 2 Experimental maximum capacity and calculated isotherm parameters for the adsorption of MB onto Ng-CuGA.
From: One-step synthesis of nitrogen-grafted copper-gallic acid for enhanced methylene blue removal
30 °C | 40 °C | 50 °C | |
|---|---|---|---|
Qexp (mg g-1) | 196.480 | 180.458 | 160.238 |
Langmuir | |||
QL (mg g-1) | 190.805 ± 4.214 | 164.854 ± 6.523 | 147.323 ± 4.688 |
KL (L mg-1) | 0.178 ± 0.019 | 0.123 ± 0.029 | 0.137 ± 0.028 |
R2 | 0.978 | 0.927 | 0.940 |
Freundlich | |||
KF (L g-1) | 59.884 ± 8.129 | 48.270 ± 6.909 | 44.111 ± 5.882 |
nF | 4.992 ± 0.646 | 4.839 ± 0.603 | 5.102 ± 0.595 |
R2 | 0.862 | 0.885 | 0.903 |
Temkin | |||
B (J mol-1) | 27.195 ± 1.92 | 23.329 ± 1.633 | 20.048 ± 1.315 |
AT (L mg-1) | 4.047 ± 0.35 | 3.374 ± 0.374 | 3.666 ± 0.379 |
R2 | 0.934 | 0.936 | 0.942 |
Sips | |||
QS (mg g-1) | 188.172 ± 4.763 | 179.985 ± 13.150 | 160.498 ± 10.104 |
as (L g-1) | 6.307 ± 1.127 | 5.479 ± 1.394 | 5.317 ± 1.144 |
sp | 1.105 ± 0.119 | 0.692 ± 0.136 | 0.679 ± 0.125 |
R2 | 0.979 | 0.940 | 0.954 |
Redlich–Peterson | |||
KRP (L g-1) | 36.099 ± 5.234 | 33.966 ± 11.390 | 29.060 ± 7.525 |
aRP (L mg-1) | 0.208 ± 0.056 | 0.342 ± 0.171 | 0.311 ± 0.125 |
β | 0.983 ± 0.025 | 0.913 ± 0.034 | 0.924 ± 0.030 |
R2 | 0.978 | 0.946 | 0.958 |
