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Needle-like iron oxide@CaCO3 adsorbents for ultrafast removal of anionic and cationic heavy metal ions

Title
Needle-like iron oxide@CaCO3 adsorbents for ultrafast removal of anionic and cationic heavy metal ions
Authors
Islam M.S.Choi W.S.Nam B.Yoon C.Lee H.-J.
Ewha Authors
이하진
SCOPUS Author ID
이하진scopus
Issue Date
2017
Journal Title
Chemical Engineering Journal
ISSN
1385-8947JCR Link
Citation
vol. 307, pp. 208 - 219
Keywords
AdsorbentCalcium carbonateHeavy metal ion removalIron oxideWater treatment
Publisher
Elsevier
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A carbonate-based mesoporous magnetic adsorbent IO@CaCO3 was synthesized via a hydrothermal method. The IO@CaCO3 adsorbent removed both anionic (As(V) and Cr(VI)) and cationic (Pb(II)) heavy metal ions at a rate orders of magnitude faster than any conventional adsorbents reported to date; due to synergistic effect of needle-like IO and CaCO3, it completely removed (99.99%) the toxic heavy metal ions from wastewater in only 9 min. In addition, it exhibited excellent As(V), Cr(VI), and Pb(II) removal capacities of 184.1, 251.6, and 1041.9 mg g−1, respectively, over a wide pH range. The heavy metal ion adsorption mechanism involves ion-exchange reactions between the cationic/anionic heavy metal ions and the positively/negatively charged groups on the adsorbent. Along with the batch adsorption tests, heavy metal ion removal by IO@CaCO3 was also performed by column filtration, demonstrating the potential of IO@CaCO3 for use in practical applications. Moreover, the excellent removal efficiencies of the adsorbent for the heavy metal ions up to drinking water level and its easy separation by an external magnetic field enabled it to be effectively reused. © 2016 Elsevier B.V.
DOI
10.1016/j.cej.2016.08.079
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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