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Surface Modified Mesostructured Iron Oxyhydroxide: Synthesis, Ecotoxicity, and Application
Author(s) -
Choi JaeWoo,
Mahendran Basuvaraj,
Chung SeungGun,
Kim SongBae,
Lee SangHyup
Publication year - 2014
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143014x14062131178790
Subject(s) - adsorption , arsenic , aqueous solution , chemistry , chromium , amine gas treating , metal , inorganic chemistry , hydrous ferric oxides , nuclear chemistry , mesoporous material , iron oxide , organic chemistry , catalysis , sorption
Mesoporous iron oxide, particularly amine‐functionalized FeO x and FeO x , 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 Fe 3 O 4 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‐FeO x , amine‐functionalized meso‐FeO x and Fe 3 O 4 particles, and compared their acute toxicity against Daphnia magna . The 24 h‐EC 50 values of the amine‐functionalized meso‐FeO x , meso‐FeO x 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‐FeO x , 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‐FeO x 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‐FeO x as an adsorbent of toxic heavy metal anions from aqueous solutions.