| To investigate a cheap and practical absorbing material, Lentinus edodes residue was immobilized by polyvinyl alcohol-Na-alginate（PVA-SA） for Pb2+ removal in wastewater. The biosorption of Pb2+ was examined on the effect of time, initial Pb2+ concentrations, pH values and co-existing ions. The results showed that immobilized L.edodes residue had a longer operation time（7 h） than the free Lentinus Edodes（1 h）. Both Cd2+ and Cu2+ had an adverse effect on the biosorption of Pb2+ on both the free L.edodes and the immobilized L.edodes, while the adverse effect was minor on the immobilized L.edodes and serious on the free L.edodes. The biosorption equilibrium data for both free and immobilized L.edodes fitted the Freundlich model well, the theoretical adsorption capacity of Pb2+ on immobilized L. edoded（943 mg·g-1） was far higher than that on the free L.edodes（14.9 mg·g-1）. Pseudo-second-order model well fitted Pb2+ biosorption kinetics of the immobilizing L. edodes and the free L. edodes. The Scanning Electron Microscope observation demonstrated that Pb2+ can form crystal through interaction with the L.edodes and infrared spectrum analysis revealed that such functional groups as-OH, -CO, -CO-NH on L. edodes and PVA played an important role on Pb2+ biosorption on immobilized L.edodes. |
