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.

UnitTemperature
20°C30°C40°C

Langmuir model
Q°maxmg/g10.6910.6110.38
KLL/mg0.2750.1640.131
R20.9750.9830.969

Freundlich model
KF(mg/g)(mg/L)n0.7621.0121.948
nF2.2862.5483.435
R20.9220.9460.941

Sips model
Q°maxmg/g10.829.298.91
b0.0130.0210.018
n0.9101.3501.415
R20.9510.9840.981