| Batch experiments were conducted to study the ability of fruiting bodies of Auricularia polytrichaand Tremella fuciformis to adsorb Cd(Ⅱ), Cu(Ⅱ), Pb(Ⅱ) and Zn(Ⅱ) from aqueous solutions, including biosorption ability of the biomass to remove heavy metals from solutions with different concentrations, kinetics of adsorption, influence of co-cations, and biosorption affinity in multi-metal system. Results showed that in the solutions with individual metal, the maximum biosorption amounts of Cd(Ⅱ),Cu(Ⅱ),Pb(Ⅱ),Zn(Ⅱ) by A. polytricha were 18.91, 18.69, 20.33, 12.42 mg·g-1, respectively, and the highest removal rates for all cases were more than 85%. The maximum biosorption amounts of Cd(Ⅱ),Cu(Ⅱ),Pb(Ⅱ),Zn(Ⅱ) by T. fuciformis were 19.98, 20.15, 19.16, 16.41 mg·g-1, respectively, and highest removal rates for all cases were more than 75%. In the solutions with initial concentrations of 10, 50 and 100 mg·L-1, the biosorption amounts increased but the removal rates decreased as the initial concentrations increasing. The pseudo-second-order reaction model described adsorption kinetics of heavy metal ions by fruiting bodies of A. polytricha and T. fuciformis better than the pseudo-first-order reaction model. In the solutions with multi metals, the biosorption amounts of heavy metals by two biosorbent were in the order of Pb(Ⅱ) > Cd(Ⅱ) > Cu(Ⅱ) > Zn(Ⅱ).The ions with more negative charges were preferential to be sorbed. The biosorption ability of A. polytricha was inhibited in multi-metal solutions. In multi-metal solutions, T. fuciformis sorbed a higher amount of Pb (Ⅱ) but lower amounts of other three ions than that in the individual metal solutions. The results indicated that both fruiting bodies of A. polytricha and T. fuciformis were potential biosorbents. |
