Research Article
Adsorption of Chromium(VI) onto Freshwater Snail Shell-Derived Biosorbent from Aqueous Solutions: Equilibrium, Kinetics, and Thermodynamics
Table 1
The calculated isotherm parameters of Langmuir, Freundlich, and Sips models for Cr(VI) adsorption on FSS at various temperatures.
| | Unit | Temperature | 20°C | 30°C | 40°C |
| Langmuir model | Q°max | mg/g | 10.69 | 10.61 | 10.38 | KL | L/mg | 0.275 | 0.164 | 0.131 | R2 | — | 0.975 | 0.983 | 0.969 |
| Freundlich model | KF | (mg/g)(mg/L)n | 0.762 | 1.012 | 1.948 | nF | — | 2.286 | 2.548 | 3.435 | R2 | — | 0.922 | 0.946 | 0.941 |
| Sips model | Q°max | mg/g | 10.82 | 9.29 | 8.91 | b | — | 0.013 | 0.021 | 0.018 | n | — | 0.910 | 1.350 | 1.415 | R2 | — | 0.951 | 0.984 | 0.981 |
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