Table 1. Langmuir parameters for the adsorption of Cd to defferent systems in the presence of 0.01 mol/L KNO3 at pH 5 and 28 °C.
| Xma (mmol/kg) | Kb (L/mol) | R2 | |
|---|---|---|---|
| Mont | 73.5 | 0.0094 | 0.98 |
| Bacteria | 185.0 | 0.0267 | 0.99 |
| Mont-bacteria | 125.9 | 0.0201 | 0.99 |
| Mont-HA | 78.2 | 0.0154 | 0.96 |
| Mont-HA-bacteria | 87.2 | 0.0237 | 0.98 |
The mass ratio of each fraction in the binary and ternary composites is 1: 0.02: 1 for Mont: HA: bacteria (dry-weight basis).
aMaximum capacity of Cd adsorption on different components as predicted by Langmuir isotherm.
bEquilibrium constant related to the binding energy.