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 ∼12 nm magnetite (Fe₃O₄) nanoparticles encapsulated in the polypyrrole (PPy) matrix. It shows 1627 mg/g uptake of iodine dissolved in water, within 2 h 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.

中文翻译：

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使用包裹在聚吡咯中的磁铁矿纳米颗粒从水中捕获和储存放射性碘

放射性碘的有效捕获和存储对于核电站事故期间的核废料存储至关重要。在这里，我们报告了Fe ₃ O ₄ @PPy粉末，该粉末含有〜12 nm包裹在聚吡咯（PPy）基质中的磁铁矿（Fe ₃ O ₄）纳米颗粒。结果表明，室温下2小时内溶解在水中的碘摄入量为1627 mg / g。Fe ₃ O ₄ @PPy本质上是铁磁性的，可以通过外部磁场与水分离。在30°C的氮气吹扫测试中，碘吸附的Fe ₃ O ₄释放2％的碘@PPy，表明在一段时间内碘的稳定储存。碘吸附的磁粉可通过用乙醇洗涤而再生。碘的XPS光谱吸附的Fe ₃ ö ₄ @PPy证实聚碘的存在（I ₃ ^-和我₅ ^{- ）}结合到聚吡咯表面。这种从碘污染水中捕获和储存碘的出色方法是一种环境友好，廉价且大规模的方法。