Kinetic and Equilibrium Isotherms Studies of Adsorption of Pb(II) from Water onto Natural Adsorbent
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![Figure 1. Effect of contact time on the adsorption of Pb(II) onto dobera leaves (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/3.595.178.421.531.683/figure-effect-contact-time-adsorption-dobera-leaves-dosage.webp)
![Figure 2. Effect of solution pH on the adsorption of Pb(II) and Ni(II) ions onto dobera (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/4.595.187.412.559.686/figure-effect-solution-adsorption-ions-dobera-time-dosage.webp)
![Figure 3. Effect of adsorbent dose on the adsorption of Pb(II) onto dobera (T = 298 K, time =180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 - 2.5 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/5.595.187.411.84.204/figure-effect-adsorbent-dose-adsorption-dobera-time-dosage.webp)
![Table 1. Adsorption kinetic parameters for the adsorption of Pb(II) onto dobera (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/6.595.185.414.87.251/table-adsorption-kinetic-parameters-adsorption-dobera-time-dosage.webp)
![Figure 5. Pseudo-second-order kinetics for the adsorption of Pb(II) onto dobera (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/7.595.185.413.230.349/figure-pseudo-second-order-kinetics-adsorption-dobera-dosage.webp)
![Figure 7. Langmuir isotherm for the adsorption of Pb(II) onto dobera leaves (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/8.595.100.537.366.505/figure-langmuir-isotherm-adsorption-dobera-leaves-time-dosage.webp)
![Figure 8. Plot of separation factor versus initial Pb(II) con-centration for the adsorption of Pb(II) onto dobera leaves (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/9.595.186.410.86.232/figure-separation-factor-versus-initial-centration-adsorption-dosage.webp)
![Figure 10. Freundlich isotherm for the adsorption of Pb(II) onto dobera leaves (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/10.595.158.441.268.411/figure-freundlich-isotherm-adsorption-dobera-leaves-time-dosage.webp)
![Figure 11. Temkin isotherm for the adsorption of Pb(II) onto dobera leaves (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/11.595.191.408.87.196/figure-temkin-isotherm-adsorption-dobera-leaves-time-dosage.webp)
![Figure 12. The Dubinin-Radushkevich (D-R) the adsorption of Pb(II) onto dobera leaves (T = 298 K, time = 180 min, [Pb(II)]0 = 30 mg/L, pHi = 5, V = 0.025 L, DL dosage = 1.0 g/L)](https://thumb-us.123doks.com/thumbv2/123dok_us/8158730.804983/12.595.185.410.550.685/figure-dubinin-radushkevich-adsorption-dobera-leaves-time-dosage.webp)
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