Biosorption of Pb(II) Ions by Klebsiella sp. 3S1 Isolated from a Wastewater Treatment Plant: Kinetics and Mechanisms Studies

Table 3

Isotherm models used to represent the biosorption equilibrium.

Model	Equation
Langmuir [17]
Freundlich [18]
Sips [19]
Redlich-Peterson [20]

: biosorption capacity (mg/g) at equilibrium.
: maximum biosorption capacity (mg/g).
: Langmuir biosorption equilibrium constant (L/mg).
: equilibrium concentrations of metal (mg/L).
: characteristic constant related to the biosorption capacity.
: characteristic constant related to the biosorption intensity.
and : Sips isotherm parameters.
, , and β: Redlich-Peterson parameters; and β varies between 0 and 1.