348182 Iron-Based Nanoparticles For The Removal Of Arsenic, Lead, and Mercury

Monday, November 4, 2013
Grand Ballroom B (Hilton)
Tegan Tingley, Engineering, Brown University, Providence, RI

Iron-Based Nanoparticles for the Removal of

Arsenic, Lead, and Mercury

Tegan Tingley, Liang Guo, Eric Wittgrove, and J.M. Calo

Brown University, School of Engineering

Providence, RI, 02912

Arsenic, lead, and mercury are well-known heavy metal toxicants. The primary goal of this research was to investigate the removal of these heavy metals from water using iron-based materials; namely, nanosize Fe2O3 and Fe3O4 (~100-200 nm), zero-valent iron (ZVI) chips (~1 mm), and nanosize colloidal rust (~20 nm) generated from the corrosion of 3 mm carbon steel spheres. Kinetic studies of arsenic removal demonstrated that the Fe2O3 and Fe3O4 removed arsenic best, both in terms of rate and ultimate equilibrium concentrations. Typically, arsenic was removed to less than the EPA MCL (10 g/L) for drinking water (with a loading of 8 mg As/kg material). A single-pass system through a filter cake (collected on 0.1μm filter paper), was also used in these investigations. Both synthesized arsenic solutions [As(V) and As(III)] and well water samples from New Hampshire, containing high arsenic levels, were used in these studies. The influence of other parameters, such as pH, will also be discussed. The ZVI chips and Fe3O4 were also found to be effective for the removal of both lead and mercury. These studies were conducted as part of a research program utilizing a novel hybrid spouted bed/filter system that both generates and utilizes colloidal rust to remove heavy metals from water.

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