Mixed-layered bismuth—oxygen—iodine materials for capture and waste disposal of radioactive iodine
| DWPI Title: Synthesizing method for mixed-layered bismuth oxy-iodine material, involves separating supernate and precipitated solids which has visible light-driven photocatalyst and bismuth oxy-iodine in specified amounts |
| Abstract: Materials and methods of synthesizing mixed-layered bismuth oxy-iodine materials, which can be synthesized in the presence of aqueous radioactive iodine species found in caustic solutions (e.g. NaOH or KOH). This technology provides a one-step process for both iodine sequestration and storage from nuclear fuel cycles. It results in materials that will be durable for repository conditions much like those found in Waste Isolation Pilot Plant (WIPP) and estimated for Yucca Mountain (YMP). By controlled reactant concentrations, optimized compositions of these mixed-layered bismuth oxy-iodine inorganic materials are produced that have both a high iodine weight percentage and a low solubility in groundwater environments. |
| Use: Synthesizing method for mixed-layered bismuth oxy-iodine material (claimed) used for disposal of radioactive iodine wastes from nuclear reactor fuel cycles. |
| Advantage: Provides well-defined patterns for bismuth oxy-iodine material with greater stability. Cost saving is achieved using the optimized mixed-layered bismuth oxy-iodine materials. Energy consumption and potential radiological exposure to workers are reduced by the combined sequestration and waste form materials processing. |
| Novelty: The synthesizing method involves forming a mixture by combining and mixing a bismuth salt, deionized water, a base element, and a predetermined element that is selected from alkali and alkali earth cations, hydrogen, and ammonium. The mixture is heated for precipitating solids and leaving a supernate. The precipitated solids are separated from the supernate. The precipitated solid has mixed-layered bismuth oxy-iodine material which has 15-20 mole% visible light-driven photocatalyst, and 80-85 mole% bismuth oxy-iodine. |
| Filed: 1/29/2013 |
| Application Number: US13752600A |
| Tech ID: SD 10928.2 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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