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

[Display omitted] •The Fe3O4@PPy is environment friendly, ferromagnetic and can be regenerated using ethanol.•Fe3O4@ PPy shows aqueous radioactive iodine adsorption capacity 1627mg/g.•The adsorbed iodine shows 2% release of iodine during nitrogen gas sweeping test.•The XPS spectrum confirms presence...

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Bibliographic Details
Published in:Journal of hazardous materials 2018-02, Vol.344, p.576-584
Main Authors: Harijan, Dilip K.L., Chandra, Vimlesh, Yoon, Taeseung, Kim, Kwang S.
Format: Article
Language:English
Subjects:
Adsorption
Magnetic separation
Magnetite nanoparticles
Polypyrrole
Radioactive iodine
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Summary:[Display omitted] •The Fe3O4@PPy is environment friendly, ferromagnetic and can be regenerated using ethanol.•Fe3O4@ PPy shows aqueous radioactive iodine adsorption capacity 1627mg/g.•The adsorbed iodine shows 2% release of iodine during nitrogen gas sweeping test.•The XPS spectrum confirms presence of polyiodides ions (I3−, I5−) on the surface of adsorbent. The effective capture and storage of radioactive iodine is of importance for nuclear waste storage during nuclear power station accidents. Here we report Fe3O4@PPy powder containing ∼12nm magnetite (Fe3O4) nanoparticles encapsulated in the polypyrrole (PPy) matrix. It shows 1627mg/g uptake of iodine dissolved in water, within 2h at room temperature. Fe3O4@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 Fe3O4@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 Fe3O4@PPy confirmed the presence of polyiodides (I3− and I5−) bound to the PPy surface. This excellent iodine capture and storage from iodine contaminated water is an environment friendly, inexpensive and large scale method.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2017.10.065