Abstract
Mesoporous iron oxide, particularly amine-functionalized FeOx and FeOx, was investigated for the removal of toxic heavy metal anions of arsenic and chromium from an aqueous solution. As a control experiment for these toxic compounds, adsorption tests were also performed on Fe3O4 as their counterpart bulk chemical. The mesostructures were confirmed by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron microscopy (TEM). In addition, we prepared stock suspensions of meso-FeOx, amine-functionalized meso-FeOx and Fe3O4 particles, and compared their acute toxicity against Daphnia magna. The 24 h-EC50 values of the amine-functionalized meso-FeOx, meso-FeOx and Fe particle suspensions used in this study were 1682, 2549 and 95 mg/L, respectively. Organism toxicity caused by spills of adsorbents can be negated when the amine-functionalized meso-FeOx, up to 1500 mg/L, is used as the adsorbent for heavy metal treatment. The adsorption of arsenic and chromium by the three adsorbents were examined, and different adsorption models were used to describe the equilibrium and kinetic data. The amine-functionalized meso-FeOx adsorbent was found to give the maximum adsorption capacities for arsenic and chromium (33.51 and 25.05 mg/g, respectively). This research gives promising results for the application of modified meso-FeOx as an adsorbent of toxic heavy metal anions from aqueous solutions.
Original language | English |
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Pages (from-to) | 2338-2346 |
Number of pages | 9 |
Journal | Water Environment Research |
Volume | 86 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2014 Dec 1 |
Bibliographical note
Funding Information:This research was supported by a grant from the Korean Ministry of the Environment as a ‘‘Converging Technology Project’’ (2012000600001) and the Korea Institute of Science and Technology (KIST) institutional program (2E23322).
Publisher Copyright:
© 2014, Water Environment Federation. All rights reserved.
Keywords
- Adsorption
- Arsenic
- Chromium
- FeO
- FeO
- Mesostructure
ASJC Scopus subject areas
- Environmental Chemistry
- Ecological Modelling
- Water Science and Technology
- Waste Management and Disposal
- Pollution