Evaluation of lead(II) biosorption kinetics and isotherms from aqueous solution with dry Myriophyllum spicatum powder

Lead as an important element used by mankind for years is highly toxic in water and regarded as a long-standing environmental contaminant. In our research, biouptake of lead(II) from simulated wastewater by Myriophyllum spicatum was examined via batch tests. Impacts of pH, adsorption time and initial Pb(II) level on its biosorption process were examined. The best pH favorable to Pb(II) adsorption was equal to 6. The Pb(II) biosorption reached equilibrium after 50 min. Langmuir and Freundlich adsorption isotherm models were used to analyze the adsorption data, indicating that the former could describe the Pb(II) biosorption with the maximum biosorption capacity of 34.13 mg/g. The Pb(II) biosorption kinetics was analyzed by pseudo-second-order and pseudo-first-order equations. It was found that Pb(II) biosorption may be described by pseudo-second-order kinetic equation. The results suggested that M. spicatum powder may be utilized as an efficient biosorbent to eliminate Pb(II) from aqueous effluent.