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Open Access Publications from the University of California

EDTA functionalized magnetic nanoparticle sorbents for cadmium and lead contaminated water treatment

  • Author(s): Huang, Y
  • Keller, AA
  • et al.

© 2015 Elsevier Ltd. Cadmium (Cd2+) and lead (Pb2+) are toxic to human beings and other organisms, and the U.S. Environmental Protection Agency (EPA) has classified both as probable human carcinogens. In this study, a regenerable magnetic ligand particle (Mag-Ligand) which includes a metal-binding organic ligand (EDTA) attached to an iron oxide nanoparticle was developed for rapid removal of Cd2+ and Pb2+ as well as other metals from contaminated water. Mag-Ligand showed fast removal ability for both Cd2+ (<2h) and Pb2+ (<15min) with relatively high sorption capacity (79.4 and 100.2mg/g for Cd2+ and Pb2+, respectively). The removal performance of Mag-Ligand was high across a wide pH range (3-10) as well as in the presence of competitive metal ions (Ca2+ and Mg2+). In addition, Mag-Ligands can be easily regenerated (washed by 1% HCl) and reused several cycles with high sorption capacity. This study indicated that Mag-Ligand is a reusable sorbent for rapid, convenient, and efficient removal of Cd2+ and Pb2+ from contaminated aquatic systems.

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