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Preparation of Ag-Based Novel Adsorbents for Environmental Remediation Open Access


Other title
Water treatment
Mercury capture
Type of item
Degree grantor
University of Alberta
Author or creator
Xie, Yijun
Supervisor and department
Liu, Qingxia (Chemical and Materials Engineering)
Zeng, Hongbo (Chemical and Materials Engineering)
Examining committee member and department
Elias, Anastasia (Chemical and Materials Engineering)
Liu, Qingxia (Chemical and Materials Engineering)
Zeng, Hongbo (Chemical and Materials Engineering)
Zhang, Hao (Chemical and Materials Engineering)
Department of Chemical and Materials Engineering
Materials Engineering
Date accepted
Graduation date
Master of Science
Degree level
With the rapid development of industry, air and water pollution has become a critical topic to the public and scientific community since the quality of air and water is essential for the prosperity of life. In this study, two novel adsorbents, Fe3O4@polydopamine (PDA)-Ag microspheres and SBA-15-Ag composites, have been synthesized by facile wet chemical methods. Monodisperse Ag nanoparticles (NPs) are densely deposited on the surface of PDA layers and within the mesopores of SBA-15, respectively. High catalytic activity of Fe3O4@PDA-Ag on the reduction of methylene blue (MB) and effective removal of Hg0 by SBA-15-Ag have been achieved mainly due to the presence of monosized Ag NPs. The capture of Hg0 by Ag NPs is due to the amalgamation mechanism of Ag-Hg alloy. Fe3O4@PDA-Ag microspheres also exhibit high adsorption rate on MB because of the electrostatic interaction between PDA layer and MB molecules. More importantly, the as-prepared Fe3O4@PDA-Ag microspheres demonstrate excellent reusability and cyclic stability (>27 cycles), and the regeneration process could be completed within several minutes by using NaBH4 as the desorption agent via a unique catalytic desorption process. The Fe3O4@PDA-Ag microspheres can be easily recycled from the solution by an external magnetic field, thanks to the good magnetic performance of Fe3O4 cores. In addition, the Fe3O4@PDA-Ag microspheres show good aqueous and acid stability in aqueous solution without significant change in morphology and performance for over half a year. The new adsorbents developed in this work show important potentials in practical applications for adsorption and catalysis.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Xie, Y.; Yan, B.; Xu, H.; Chen, J.; Liu, Q.; Deng, Y.; Zeng, H., Highly Regenerable Mussel-Inspired Fe3O4@Polydopamine-Ag Core–Shell Microspheres as Catalyst and Adsorbent for Methylene Blue Removal. ACS Appl. Mater. Interfaces 2014, 6, 8845-8852.

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