Sorption Behavior and Mechanism of Pb(II) on Chinese Loess
Publication: Journal of Environmental Engineering
Volume 135, Issue 1
Abstract
Lead pollution is common in Western China and has caused serious public health problems recently. The treatment of wastewater containing Pb(II) is stringent for the sustainable development of local economics. The Chinese loess proved effective to remove Pb(II) from aqueous solution and applicable in the treatment of wastewater from lead–zinc ore mining sites. The adsorption capacity of Chinese loess about Pb(II) is determined as high as in this study. Factors affecting the adsorption of Pb(II) include slurry concentration, solution pH, temperature, and equilibrating duration. The optimum conditions for Pb(II) adsorption include sorbent , , , and equilibration . The isotherms and kinetic data are well fitted with Langmuir model and pseudo-first order kinetics, respectively. The thermodynamic behavior reveals the exothermic and spontaneous nature of the adsorption. The adsorption of Pb(II) on loess involves chemical reaction with calcite and surface complexation with clay minerals and hydrolysis of quartz; the former is considered as the dominant mechanism. X-ray diffraction and Fourier transform infrared patterns confirmed these speculations.
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Acknowledgments
The writers would like to express their sincere gratitude to the Key Project of the National Natural Science Foundation of China (NSFC) (Grant No. 50538080) and National Science Fund for Distinguished Young Scholars (Grant No. 50425825) for the financial support to this study.
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© 2009 ASCE.
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Received: Jan 7, 2008
Accepted: Jun 11, 2008
Published online: Jan 1, 2009
Published in print: Jan 2009
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