Modified composites based on mesostructured iron oxyhydroxide and synthetic minerals: A potential material for the treatment of various toxic heavy metals and its toxicity

Seung Gun Chung, Jae Chun Ryu, Mi Kyung Song, Byungryul An, Song Bae Kim, Sang Hyup Lee, Jae Woo Choi

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

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 (60.1mgg-1) and arsenic (71.9mgg-1) compared with other adsorbents, such as DABs (158.1 and 0.0mgg-1), SZIB (42.9 and 0.0mgg-1) and SZMIOIB (54.0 and 5.9mgg-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.

Original languageEnglish
Pages (from-to)161-168
Number of pages8
JournalJournal of hazardous materials
Volume267
DOIs
Publication statusPublished - 2014 Feb 28

Keywords

  • Adsorbent
  • Composites
  • Heavy metal
  • Mesostructured iron oxyhydroxide
  • Synthetic zeolite
  • Toxic

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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