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Kinetic and Equilibrium Isotherms Studies of Adsorption of Pb(II) from Water onto Natural Adsorbent

Journal of Environmental Protection 2014年第17期5卷 1667-1681页

作者： Taha M. Elmorsi Zeinhom H. Mohamed Walied Shopak Ahmed M. Ismaiel Chemistry Department Faculty of Science Jazan University Jazan KSA Chemistry Department Faculty of Science Al-Azhar University Cairo Egypt

In this research dobera leaves (DL), an agricultural waste, available in large quantity in south region of Saudi Arabia, were used as low-cost adsorbent for removal of metal ions such as Pb(II). Batch operation was used to study the equilibrium behavior of DL. The effects of initial concentration of Pb(II), solution pH, contact time and adsorbent dose were evaluated. To study the kinetics of adsorption of Pb(II) onto DL, pseudo-first-order, pseudo-second-order and intra-particle diffusion were used. Adsorption process undergoes pseudo-second-order kinetic as proved by the high value of R2. Furthermore, to design the equilibrium data of adsorption of process, four adsorption isotherm models such as Langmuir, Freundlich Temkin and Dubinin-Radushkevich (D-R) were used. It is found that Langmuir equation has the highest value of R2 (0.999) compared with other models. In presences of a mixture of Pb(II)/Ni(II), DL were found to be selective for Pb(II) ions with a high adsorptive capacity of 83 mg/g and show favorable adsorption with RL 90%) from drinking water with less competition of other ions present in water.

关键词： dobera Leaves Pb(II) Adsorption Kinetics Adsorption Isotherms

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