3.3. Biosorption isotherm results
The maximum biosorption capacity was investigated for each metal using equilibrium sorption isotherms.
The experimental data were generated under the following conditions; 20–100 mg/L metal ion solution, 2.5 mg biosorbent, pH 5.0 (Cu(II)) and 5.5 (Pb(II)), 7.5 min(Cu(II)) and 10 min(Pb(II)), and at room temperature.
The biosorption isotherms are shown in Fig. 7.
The values calculated from the isotherm equations are presented in Table 2.
The results obtained from the equations indicated that thee quilibrium data fitted the Langmuir biosorption isotherms better than the Freundlich and Temkin isotherms. The regres-sion coefficient of the Langmuir isotherms was higher than the others.