Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8080366 | Journal of Environmental Radioactivity | 2018 | 8 Pages |
Abstract
Radioiodine (present mostly as 129I) is difficult to remove from waste streams or contaminated groundwater because it tends to exist as multiple anionic species (i.e., iodide (Iâ), iodate (IO3â) and organo-iodide) that do not bind to minerals or synthetic materials. In this work, the efficacy of organoclay OCB and OCM, and granular activated carbon (GAC) as sorbents to bind Iâ and IO3â from artificial groundwater (AGW) was examined. These sorbents were highly effective at removing Iâ and IO3â from AGW under oxic condition, with the adsorption capacity up to 30â¯mg I/g sorbent. Based on X-ray spectroscopy measurements, Iâ was bound to organic ligands in organoclays OCB and OCM, but when GAC was exposed to Iâ in groundwater, the sequestered I species was molecular I2. For IO3â interacting with organoclay OCB and GAC, the adsorbed I species remained being IO3â, but when organoclay OCM that contains both quaternary amine and sulfur was exposed to IO3â, the sulfur compound would reduce IO3â to Iâ that was then bound to organic ligands. Thus, the inexpensive and high-capacity organoclays and GAC may provide a practical solution for removing 129I contaminant from environmental systems and liquid nuclear wastes.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Dien Li, Daniel I. Kaplan, Allison Sams, Brian A. Powell, Anna S. Knox,