Study on Dynamics and Thermodynamics for Removal of Pb(II) from Aqueous Solution by Ion-Imprinted Sorbent
The adsorption of lead onto the Pb(Ⅱ) ion-imprinted sorbents has been dynamically and thermodynamically investigated by considering the influence of various parameters such as solution pH, contact time, initial concentration and temperature. The adsorption of Pb(Ⅱ) increased with an increase of initial concentration. The optimal range of pH for Pb(Ⅱ) adsorption is 5-7. First-order rate equation and pseudo second-order rate equations were applied to study adsorption kinetics. In comparison to first-order kinetic model, pseudo-second-order model described well the sorption kinetics of Pb(Ⅱ) onto Pb(Ⅱ) ion-imprinted sorbents from aqueous solution. The adsorption rate slightly increased with the increase of solution temperature. The Langmuir and Freundlich sorption models were employed to depict the isotherms and isotherm constants. Equilibrium modeling of the adsorption showed that the adsorption of Pb(Ⅱ) ion-imprinted sorbents to the imprinted ion Pb(Ⅱ) was fitted well to the Langmuir equation. From the results of the thermodynamic analysis, standard free energy change G0, standard enthalpy change H0, and standard entropy change S0 were determined. The positive value of H0 suggests that the interaction of Pb(Ⅱ) adsorbed by Pb(Ⅱ) ion-imprinted sorbents is endothermic. The negative value of G0 and positive value of S0 indicate that the adsorption reaction is spontaneous process.
ion imprinting dynamics thermodynamics lead sorption
WANG Limin ZHOU Meihua
College of Environmental Science & Engineering,Donghua University,Shanghai 201620,China Dept. of Env College of Environmental Science & Engineering,Donghua University,Shanghai 201620,China
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1714-1719
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）