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RECORD NUMBER: 33 OF 39

OLS Field Name OLS Field Data
Main Title Preparation of Ag-based novel adsorbents for environmental remediation /
Author Xie, Yijun,
Year Published 2014
OCLC Number 935556718
Subjects Water--Purification--Adsorption. ; Environmental chemistry. ; Nanostructured materials--Environmental aspects.
Internet Access
Description Access URL
Free Access http://hdl.handle.net/10402/era.39299
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
ELBM  TD449.5.X5 2014 AWBERC Library/Cincinnati,OH 01/25/2016
Collation xv, 110 pages : illustrations (some color) ; 28 cm
Notes
"A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Materials Engineering, Department of Chemical and Materials Engineering." Includes bibliographical references (pages 95-110).
Contents Notes
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.