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Citation
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HERO ID
7623761
Reference Type
Journal Article
Title
Composite Fe3O4/Humic Acid Magnetic Sorbent and its Sorption Ability for Chlorophenols and some other Aromatic Compounds
Author(s)
Janos, P; Kormunda, M; Zivotsky, O; Pilarova, V; ,
Year
2013
Is Peer Reviewed?
1
Journal
Separation Science and Technology
ISSN:
0149-6395
EISSN:
1520-5754
Publisher
TAYLOR & FRANCIS INC
Location
PHILADELPHIA
Volume
48
Issue
13
Page Numbers
2028-2035
Language
English
DOI
10.1080/01496395.2013.791317
Web of Science Id
WOS:000322867500014
URL
http://www.tandfonline.com/doi/abs/10.1080/01496395.2013.791317
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Abstract
A composite magnetic sorbent with a relatively high content of humic substances (above 35% of organic carbon) was prepared by co-precipitation of Fe2+/Fe3+ salts with commercially available alkaline humate concentrate. Magnetite (Fe3O4) was identified as the main crystalline phase bearing the magnetic properties of the sorbent. Scanning electron microscope (SEM) images revealed the presence of uniform sub-micron structures on the surface of the sorbent grains. Due to the presence of humic substances, the sorbent exhibited good sorption ability towards low-polarity organic pollutants, namely chlorophenols. The sorption efficiency increased in the order of 4-mono-<2,4-di-<2,4,5-trichlorophenol in accordance with growing hydrophobicity of these compounds, confirming a hydrophobic nature of the interactions involved in the sorption process. Similar trends were found in the desorption study utilizing water and methanol as leachants. Some polycyclic aromatic hydrocarbons (naphthalene, anthracene, phenanthrene, fluoranthene, pyrene) were also retained on the sorbent. The chemical composition as well as the main physical characteristics (surface area, phase composition) of the sorbent remained virtually unchanged during the sorption process. The sorbent retained its magnetic properties during the sorption of organic substances from aqueous solutions, which provides an opportunity for its regeneration.
Keywords
humate-based sorbent; magnetic sorbent; magnetite; PAHs; sorption of chlorophenols
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