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

By W. Yantasee, Cynthia L. Warner, Thanapon Sangvanich, R. Addleman, T. G. Carter, R. Wiacek, G. Fryxell, C. Timchalk, M. Warner. Environmental Science and Technology, 2007

643 citations recorded by the source corpus.

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.

Subfields: Electrochemistry, Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/3fb57a7e447eec78dc8623bc413273697547af82

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Citations in the corpus

Screen-printed electrodes for environmental monitoring of heavy metal ions: a review (2016, positive): “Finally, some authors [72, 82, 83] presented the use of magnetic particles to preconcentrate the metals and after to perform the detection using gold film electrodes [72].”
Recent progress and future challenges on the use of high performance magnetic nano-adsorbents in environmental applications (2014, background): “Therefore, it is not surprising that thiol based magnetic nanoadsorbents have been presented as an alternative treatment technology for mercury polluted waters since their adsorption capabilities have proved to be superior to other commercial adsorbents [142].”