Surface Modified Mesostructured Iron Oxyhydroxide: Synthesis, Ecotoxicity, and Application. (1st December 2014)

• Record Type: Journal Article
• Authors: Choi, Jae‐Woo; Mahendran, Basuvaraj; Chung, Seung‐Gun; Kim, Song‐Bae; Lee, Sang‐Hyup
• Is Part Of: Water environment research. Volume 86:Number 12(2014)
• Page Start: 2338
• Page End: 2346
• Publication Date: 2014-12-01
• Subjects: adsorption -- arsenic -- chromium -- mesostructure -- FeOx -- Fe3O4; Water quality management -- Periodicals; Water -- Purification -- Periodicals; Water -- Pollution -- Periodicals; Water -- Pollution; Water -- Purification; Water quality management; Sewage; Water Pollution; Periodicals; Electronic journals; Periodicals; 628.16
• DOI: 10.2175/106143014X14062131178790
• Languages: English
• ISSNs: 1061-4303

Abstract

ABSTRACT: : 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 Fe3 O4 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 Fe3 O4 particles, and compared their acute toxicity against Daphnia magna . The 24 h‐EC50 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.