Investigation of Pb(II) biosorption from aqueous media via Erwinin sp. isolated from the heavy metal-containing soils

This paper focuses on the potential application of Erwinin sp. in environmental purification. The Pb(II) biosorption was studied by batch method under different external environment (pH value, biosorption time, Erwinin sp. dosage, Pb(II) concentration and temperature). Batch experiments showed that Erwinin sp. could rapidly reach the biosorption equilibrium (90 min) of high capacity of Pb(II) biosorption (71.73 mg/g, T = 303 K) by Langmuir model. The interaction mechanism between Pb(II) and Erwinin sp. was investigated by TEM, XPS and FT-IR. Results of FT-IR and XPS showed that Erwinin sp. were rich in functional groups, which was the main reason for the effective Pb(II) removal. The Pb(II) biosorption was also studied by kinetic model and thermodynamic model. Pb(II) biosorption conforms to pseudo-second-order mode and is a spontaneous endothermic process. According to the above results, Erwinin sp. is a potential biosorbent for the treatment of lead pollution due to its wide source of biosorption materials, large biosorption capacity and high treatment efficiency.