Radioactive iodine capture and storage from water using magnetite nanoparticles encapsulated in polypyrrole.

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Journal of hazardous materials, ISSN: 1873-3336, Vol: 344, Page: 576-584

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Harijan, Dilip K L; Chandra, Vimlesh; Yoon, Taeseung; Kim, Kwang S
Elsevier BV
Environmental Science; Radioactive iodine; Magnetic separation; Adsorption; Magnetite nanoparticles; Polypyrrole
article description
The effective capture and storage of radioactive iodine is of importance for nuclear waste storage during nuclear power station accidents. Here we report FeO@PPy powder containing ∼12nm magnetite (FeO) nanoparticles encapsulated in the polypyrrole (PPy) matrix. It shows 1627mg/g uptake of iodine dissolved in water, within 2h at room temperature. FeO@PPy is ferromagnetic in nature and can be separated from water using external magnetic field. The nitrogen gas sweeping test at 30°C shows release of 2% iodine from iodine adsorbed FeO@PPy, revealing stable storage of iodine for a moderate period. The iodine-adsorbed magnetic powder can be regenerated by washing with ethanol. The XPS spectrum of iodine adsorbed FeO@PPy confirmed the presence of polyiodides (I and I) bound to the PPy surface. This excellent iodine capture and storage from iodine contaminated water is an environment friendly, inexpensive and large scale method.