Figures & data
Figure 1. FTIR spectrum of unloaded and Zn(II)-loaded biomass: (a) unloaded biomass, (b) Zn(II) loaded biomass.
Figure 2. Effect of pH on biosorption efficiency (a) and initial Zn(II) concentration on Zn(II) uptake (qe = mg Zn(II)/g biomass) and biosorption efficiency (b). CO = 10 mg/L, T = 20ºC, m = 5 g/L, stirring speed = 150 rpm, contact time (t) = 60 min.
Figure 3. Effect of biosorbent concentration (a) and stirring speed (b). Co = 10 mg/L, pH 5.0, T = 20ºC, stirring speed = 150 rpm, t = 60 min.
Figure 4. Effect of contact time (a) and temperature (b) on biosorption. Initial metal concentration (CO) = 10 mg/L, pH 5.0, temperature (T) = 20ºC, biosorbent concentration (m) = 5 g/L, stirring speed = 150 rpm.
Figure 5. Langmuir isotherm (a) and Freundlich isotherm (b) plots for the biosorption of Zn(II) onto Pseudevernia furfuracea biomass. Biomass dosage: 5 g/L, contact time: 60 min; pH: 5; stirring speed: 150 rpm; temperature: 20ºC.
Table 1. Adsorption isotherm constants for biosorption of Zn(II) onto Pseudevernia furfuracea biomass
Table 2. Kinetic parameters obtained from pseudo-first-order and pseudo-second-order versions for biosorption of Zn(II) onto Pseudevernia furfuracea biomass at different temperatures
Figure 6. Pseudo-second-order kinetic plots at different temperatures (a) and plot of ln KD vs. 1/T for the estimation of thermodynamic parameters (b) for biosorption of Zn(II) onto Pseudevernia furfuracea.
Table 3. Thermodynamic parameters for the biosorption of Zn(II) onto Pseudevernia furfuracea biomass
Figure 7. Effect of various agents on desorption of Zn(II) from Pseudevernia furfuracea (desorption time 15 min).
