title: EDTA functionalized magnetic nanoparticle sorbents for cadmium and lead contaminated water treatment.
abstract: Cadmium (Cd(2+)) and lead (Pb(2+)) 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 Cd(2+) and Pb(2+) as well as other metals from contaminated water. Mag-Ligand showed fast removal ability for both Cd(2+) (<2 h) and Pb(2+) (<15 min) with relatively high sorption capacity (79.4 and 100.2 mg/g for Cd(2+) and Pb(2+), 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 (Ca(2+) and Mg(2+)). 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 Cd(2+) and Pb(2+) from contaminated aquatic systems.
authors.affiliation: Bren School of Environmental Science and Management, University of California at Santa Barbara, CA 93106, USA.
authors.forename: Yuxiong
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Bren School of Environmental Science and Management, University of California at Santa Barbara, CA 93106, USA. Electronic address: keller@bren.ucsb.edu.
authors.forename: Arturo A
authors.initials: AA
authors.lastname: Keller
mesh_terms: D000327:Adsorption; D000465:Algorithms; D002104:Cadmium / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008670:Metals / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D058185:Magnetite Nanoparticles; D008670:Metals; D014874:Water Pollutants, Chemical; D002104:Cadmium; D007854:Lead; D004492:Edetic Acid
keywords: EDTA; Magnetic separation; Metal decontamination; Nanoparticle; Regeneration; Sorption