Associated Adsorption Characteristics of Pb(II) and Zn(II) by a Novel Biosorbent Extracted from Waste-Activated Sludge
Publication: Journal of Environmental Engineering
Volume 142, Issue 7
Abstract
The associated adsorption of and by a novel biosorbent extracted from waste-activated sludge (WAS) after short-time aerobic digestion is systematically investigated by using aqueous binary metal solutions. slightly inhibited adsorption onto the biosorbent, while markedly inhibited adsorption onto the biosorbent. When the total mass concentrations of metal ions in the disposed solutions were the same, the total adsorption capacity of the biosorbent for and in the binary-metal solution was more than that for in a single-metal solution, but less than that for in a single-metal solution. Moreover, a rising proportion of concentration in the binary-metal solution was found to increase the total adsorption capacity of the biosorbent. Both the Langmuir model and Freundlich model commendably described the adsorption isotherms of and in the associated adsorption system. The maximal adsorption capacity for each metal ion in the binary-metal solution was obviously clearly lower than that in the single-metal solution. The spectra of energy dispersive -ray confirmed that the adsorbed metal ions lay in the precipitates of the adsorption reactions. The spectra of Fourier transform infrared spectroscopy revealed that complexation and ion exchange between the functional groups and the metal ions played an important role in the associated adsorption process.
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Acknowledgments
The authors sincerely acknowledge the support provided by Sheng Yun-Fei College Students Scientific and Technological Innovation Fund, China Scholarship Council, the National Science & Technology Pillar Program (2013BAD21B03), and the higher school innovative engineering plan (111 Project).
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© 2016 American Society of Civil Engineers.
History
Received: Jun 16, 2015
Accepted: Nov 30, 2015
Published online: Feb 23, 2016
Published in print: Jul 1, 2016
Discussion open until: Jul 23, 2016
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