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Removal of heavy metals from aqueous systems with thiol functionalized superparamagnetic nanoparticles.

Authors
Yantasee-W; Warner-CL; Sangvanich-T; Addleman-RS; Carter-TG; Wiacek-RJ; Fryxell-GE; Timchalk-C; Warner-MG
Source
Environ Sci Technol 2007 Jul; 41(14):5114-5119
NIOSHTIC No.
20032451
Abstract
We have shown that superparamagnetic iron oxide (Fe3O4) nanoparticles with a surface functionalization of dimercaptosuccinic acid (DMSA) are an effective sorbent material for toxic soft metals such as Hg, Ag, Pb, Cd, and Tl, which effectively bind to the DMSA ligands and for As, which binds to the iron oxide lattices. The nanoparticles are highly dispersible and stable in solutions, have a large surface area (114 m2/g), and have a high functional group content (1.8 mmol thiols/g). They are attracted to a magnetic field and can be separated from solution within a minute with a 1.2 T magnet. The chemical affinity, capacity, kinetics, and stability of the magnetic nanoparticles were compared to those of conventional resin based sorbents (GT-73), activated carbon, and nanoporous silica (SAMMS) of similar surface chemistries in river water, groundwater, seawater, and human blood and plasma. DMSA-Fe3O4 had a capacity of 227 mg of Hg/g, a 30-fold larger value than GT-73. The nanoparticles removed 99 wt% of 1 mg/L Pb within a minute, while it took over 10 and 120 min for Chelex-100 and GT-73 to remove 96% of Pb.
Keywords
Analytical-instruments; Analytical-processes; Organic-compounds; Toxic-materials; Metal-compounds; Metal-oxides; Metallic-compounds; Metallic-poisons; Chemical-binding; Chemical-extraction; Chemical-properties; Nanotechnology
Contact
Pacific Northwest National Laboratory, Richland, WA 99352
CODEN
ESTHAG
CAS No.
1345-25-1; 7440-44-0; 7631-86-9
Publication Date
20070715
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R21-OH-008900
Issue of Publication
14
ISSN
0013-936X
Source Name
Environmental Science and Technology
State
WA
Performing Organization
Battelle Pacific Northwest Laboratories
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