On 11 March 2011, the day of the unforgettable disaster of the 9 magnitude Tohoku earthquake and quickly followed by the devastating Tsunami, a damageable amount of radionuclides had dispersed from the Fukushima Daiichi's damaged nuclear reactors. Decontamination of the dispersed radionuclides from seawater and soil, due to the huge amounts of coexisting ions with competitive functionalities, has been the topmost difficulty. Ferric hexacyanoferrate, also known as Prussian blue (PB), has been the most powerful material for selectively trapping the radioactive cesium ions; its high tendency to form stable colloids in water, however, has made PB to be impossible for the open-field radioactive cesium decontamination applications. A nano/nano combinatorial approach, as is described in this study, has provided an ultimate solution to this intrinsic colloid formation difficulty of PB. Cellulose nanofibers (CNF) were used to immobilize PB via the creation of CNF-backboned PB. The CNF-backboned PB (CNF/PB) was found to be highly tolerant to water and moreover, it gave a 139 mg/g capability and a million (106) order of magnitude distribution coefficient (Kd) for absorbing of the radioactive cesium ion. Field studies on soil and seawater decontaminations in Fukushima gave satisfactory results, demonstrating high capabilities of CNF/PB for practical applications.

译文

2011年3月11日,这是东北9级地震令人难忘的灾难的一天,随后又发生了毁灭性的海啸,福岛第一核电站受损的核反应堆中散布了可破坏的放射性核素。由于大量具有竞争性功能的共存离子,海水和土壤中分散的放射性核素的去污一直是最困难的。六氰铁酸铁,也称为普鲁士蓝 (PB),是选择性捕获放射性铯离子的最强大的材料; 但是,它在水中形成稳定胶体的高度趋势使PB无法用于露天放射性铯净化应用。如本研究中所述,纳米/纳米组合方法为PB的这种固有胶体形成困难提供了最终解决方案。纤维素纳米纤维 (CNF) 通过产生CNF背结的PB来固定PB。发现CNF背结PB (CNF/PB) 对水具有高度耐受性,此外,它具有139的  mg/g能力和百万 (106) 数量级的分布系数 (Kd) 吸收放射性铯离子。福岛土壤和海水净化的现场研究取得了令人满意的结果,证明了CNF/PB在实际应用中的强大能力。

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