Adsorption of lead(II) from aqueous solution onto Hydrilla verticillata

作者：Huang, Ling zhi; Zeng, Guang ming^*; Huang, Dan lian; Li, Li feng; Huang, Peng mian; Xia, Chang bin

来源：Biodegradation, 2009, 20(5): 651-660.

DOI：10.1007/s10532-009-9252-4

• Pb(II)
• Hydrilla verticillata
• Adsorption isotherm
• Thermodynamics

The adsorption of Pb(II) onto Hydrilla verticillata was examined in aqueous solution with parameters of pH, adsorbent dosage, contact time and temperature. The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms, and both models fitted well. The monolayer adsorption capacity of Pb(II) was found as 104.2 mg/g at pH 4 and 25A degrees C. Dubinin-Radushkevich (D-R) isotherm model was also applied to the equilibrium data. The mean free energy of adsorption (15.81 kJ/mol) indicated that the adsorption of Pb(II) onto H. verticillata may be carried out via chemical ion-exchange mechanism. Thermodynamic parameters, free energy (Delta G (0)), enthalpy (Delta H (0)) and entropy (Delta S (0)) of adsorption were also calculated. These parameters showed that the adsorption of Pb(II) onto H. verticillata was a feasible, spontaneous and exothermic process in nature. The influence of Cd2 , Cu2 and Ni2 on adsorption of Pb2 onto H. verticillata was studied, too. In the investigated range of operating conditions, it was found that the existence of Cd (2 ), Cu (2 ) and Ni (2 ) had no impact on the adsorption of Pb2 .

• 出版日期2009-9
• 单位长沙理工大学; 湖南大学