Figure 1.

Adsorption kinetic data of Pb²⁺ onto BSL-BC fitted by the (a) PFO and (b) PSO kinetic models and (c) intra-particle diffusion model. Adsorption kinetic data of Cd²⁺ onto BSL-BC fitted by the (d) PFO and (e) PSO kinetic models and (f) intra-particle diffusion model. The solutions containing 0.8 g/L BSL-BC and initial concentrations of 200 mg/L Pb²⁺ (pH 5.0) or 50 mg/L Cd²⁺ (pH 5.5) were mixed at 180 rpm and 25 °C.