Table 3.
Langmuir constants for the adsorption of Cu(II) ions a.
| Sample | Zeolite Mass Fraction | Hydrogel | Aerogel | Xerogel | |||
|---|---|---|---|---|---|---|---|
| Qmax (mg·g−1) | K (L·mg−1) | Qmax (mg·g−1) | K (L·mg−1) | Qmax (mg·g−1) | K (L·mg−1) | ||
| Chitosan | 1 | 190% ± 10% | 0.021% ± 18% | 139% ± 9% | 0.016% ± 16% | 24% ± 23% | 0.07% ± 72% |
| Composite A | 0.21 | 155% ± 10% | 0.083% ± 30% | 168% ± 18% | 0.025% ± 33% | 9.4% ± 14% | 0.29% ± 63% |
| Composite B | 0.48 | 111% ± 16% | 0.15% ± 62% | 113% ± 14% | 0.040% ± 34% | 12.7% ± 9% | 0.38% ± 72% |
| Composite C | 0.59 | 83% ± 9% | 0.28% ± 50% | 110% ± 13% | 0.065% ± 38% | 15.6% ± 10% | 3.5% ± 100% |
a To be compared with values for zeolite Na-X: Qmax 166 mg·g−1, K 2.6 ± 2.6 L·mg−1.