Chung, Seung-Gun Ryu, Jae-Chun Song, Mi-Kyung An, Byungryul Kim, Song-Bae Lee, Sang-Hyup Choi, Jae-Woo 2024-01-20T10:32:18Z 2024-01-20T10:32:18Z 2021-09-05 2014-02 0304-3894 https://pubs.kist.re.kr/handle/201004/127152 The composites of mesostructured iron oxyhydroxide and/or commercial synthetic zeolite were investigated for use in the removal of toxic heavy metals, such as cadmium, copper, lead and arsenic, from aqueous solution. Four types of adsorbents, dried alginate beads (DABs), synthetic-zeolite impregnated beads (SZIBs), meso-iron-oxyhydroxide impregnated beads (MIOIBs) and synthetic-zeolite/meso-iron-oxyhydroxide composite beads (SZMIOIBs), were prepared for heavy metal adsorption tests. Laboratory experiments were conducted to investigate the removal efficiencies of cations and anions of heavy metals and the possibility of regenerating the adsorbents. Among these adsorbents, the MIOIBs can simultaneously remove cations and anions of heavy metals; they have high adsorption capacities for lead (60.1 mg g(-1)) and arsenic (71.9 mg g(-1)) compared with other adsorbents, such as DABs (158.1 and 0.0 mg g(-1)), SZIB (42.9 and 0.0 mg g(-1)) and SZMIOIB (54.0 and 5.9 mg g(-1)) for lead and arsenic, respectively. Additionally, the removal efficiency was consistent at approximately 90%, notwithstanding repetitive regeneration. The characteristics of meso-iron-oxyhydroxide powder were confirmed by X-ray diffraction, Brunauer-Emmett-Teller and transmission electron microscopy. We also performed a comparative toxicity study that indicated that much lower concentrations of the powdered form of mesostructured iron oxyhydroxide had stronger cytotoxicity than the granular form. These results suggest that the granular form of meso iron oxyhydroxide is a more useful and safer adsorbent for heavy metal treatment than the powdered form. This research provides promising results for the application of MIOIBs as an adsorbent for various heavy metals from wastewater and sewage. (C) 2013 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV Modified composites based on mesostructured iron oxyhydroxide and synthetic minerals: A potential material for the treatment of various toxic heavy metals and its toxicity Article 10.1016/j.jhazmat.2013.12.056 1 JOURNAL OF HAZARDOUS MATERIALS, v.267, pp.161 - 168 JOURNAL OF HAZARDOUS MATERIALS 267 161 168 N scie scopus 000332812500020 2-s2.0-84892538897 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article ACTIVATED CARBON AQUEOUS-SOLUTIONS ARSENIC REMOVAL ION BATTERIES WATER ADSORPTION SORPTION OXIDE WASTEWATERS ADSORBENT Mesostructured iron oxyhydroxide Synthetic zeolite Composites Toxic Heavy metal Adsorbent