Modified composites based on mesostructured iron oxyhydroxide and synthetic minerals: a potential material for the treatment of various toxic heavy metals and its toxicity.
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.
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
Seung-Gun
SG
Chung
Center for Integrated Risk Research, Cellular and Molecular Toxicology Laboratory, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
Jae-Chun
JC
Ryu
Center for Integrated Risk Research, Cellular and Molecular Toxicology Laboratory, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
Mi-Kyung
MK
Song
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea.
Byungryul
B
An
Environmental Functional Materials & Biocolloids Laboratory, Seoul National University, Seoul 151-921, Republic of Korea.
Song-Bae
SB
Kim
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea; Graduate School of Convergence Green Technology and Policy, Korea University, Seoul 136-701, Republic of Korea.
Sang-Hyup
SH
Lee
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea. Electronic address: plead36@kist.re.kr.
Jae-Woo
JW
Choi
D000327:Adsorption; D000464:Alginates; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D005290:Ferric Compounds / Q000737:chemistry*; D006801:Humans; D007202:Indicators and Reagents; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry* / Q000633:toxicity*; D008855:Microscopy, Electron, Scanning; D008903:Minerals / Q000737:chemistry*; D010316:Particle Size; D011208:Powders; D012996:Solutions; D013778:Tetrazolium Salts; D013816:Thermodynamics; D013844:Thiazoles; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity*; D014961:X-Ray Diffraction; D017641:Zeolites
D000464:Alginates; D005290:Ferric Compounds; D007202:Indicators and Reagents; D019216:Metals, Heavy; D008903:Minerals; D011208:Powders; D012996:Solutions; D013778:Tetrazolium Salts; D013844:Thiazoles; D014874:Water Pollutants, Chemical; D017641:Zeolites; C021024:ferric hydroxide; C022616:thiazolyl blue
Adsorbent; Composites; Heavy metal; Mesostructured iron oxyhydroxide; Synthetic zeolite; Toxic