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Water 2018, 10(2), 210; doi:10.3390/w10020210

Effective Removal of Lead Ions from Aqueous Solution Using Nano Illite/Smectite Clay: Isotherm, Kinetic, and Thermodynamic Modeling of Adsorption

College of Light industry and Food Engineering, Guangxi University, Nanning 530004, China
Department of Management Science and Engineering, Guangxi University of Finance and Economics, Nanning 530003, China
Guangxi Zhuang Autonomous Region Environmental Monitoring Center, Nanning 530028, China
College of Resources, Enviroment and Materials, Guangxi University, Nanning 530004, China
Author to whom correspondence should be addressed.
Received: 14 January 2018 / Revised: 6 February 2018 / Accepted: 13 February 2018 / Published: 16 February 2018
(This article belongs to the Special Issue Recent Advances in Water Management: Saving, Treatment and Reuse)
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Illite-smectite clay is a new mixed mineral of illite and montmorillonite. The ability of nano illite/smectite clay to remove Pb(II) from slightly polluted aqueous solutions has been investigated. The effects of pH, contact time, initial concentration of Pb(II), nano illite/smectite clay dosage, and temperature on the adsorption process were studied. The nano illite/smectite clay was characterized by X-Ray Diffraction (XRD), Fourier transform infrared spectrometry (FTIR), and Scanning electron microscopy (SEM). The results showed that Pb(II) was adsorbed efficiently by nano illite/smectite clay in aqueous solution. The pseudo-second-order kinetic model best described the kinetic of the adsorption, and the adsorption capacity of nano illite/smectite (I-Sm) clay was found to be 256.41 μg·g−1 for Pb(II). The adsorption patterns followed the Langmuir isotherm model. Thermodynamic parameters, including the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) changes, indicated that the present adsorption process was feasible, spontaneous, and endothermic in the temperature range of 298–333 K. View Full-Text
Keywords: Pb(II); nano illite/smectite clay; adsorption kinetics; adsorption thermodynamic Pb(II); nano illite/smectite clay; adsorption kinetics; adsorption thermodynamic

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yin, J.; Deng, C.; Yu, Z.; Wang, X.; Xu, G. Effective Removal of Lead Ions from Aqueous Solution Using Nano Illite/Smectite Clay: Isotherm, Kinetic, and Thermodynamic Modeling of Adsorption. Water 2018, 10, 210.

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