Xu Jun, Bu Fan-Xing, Guo Yi-Fei, Zhang Wei, Hu Ming, Jiang Ji-Sen
School of Physics and Materials Science, East China Normal University, Shanghai, 200241, China.
J Nanosci Nanotechnol. 2018 May 1;18(5):3230-3238. doi: 10.1166/jnn.2018.14546.
Radioactive cesium pollution have received considerable attention due to the increasing risks in development of the nuclear power plants in the world. Although various functional porous materials are utilized to adsorb Cs+ ions in water, Prussian blue analogues (PBAs) are an impressive class of candidates because of their super affinity of Cs+ ions. The adsorption ability of the PBAs strongly relate to the mesostructure and interstitial sites. To design a hollow PBA with large number of interstitial sites, the traditional hollowing methods are not suitable owing to the difficulty in processing the specific PBAs with large number of interstitial sites. In this work, we empolyed a rational strategy which was to form a "metal oxide"@"PBA" core-shell structure via coordination replication at first, then utilized a mild etching to remove the metal oxide core, led to hollow PBA finally. The obtained hollow PBAs were of high crystallinity and large number of interstitial sites, showing a super adsorption performance for Cs+ ions (221.6 mg/g) within a short period (10 min).
由于全球核电站发展带来的风险不断增加，放射性铯污染已受到广泛关注。尽管各种功能性多孔材料被用于吸附水中的铯离子，但普鲁士蓝类似物（PBAs）因其对铯离子的超强亲和力而成为一类令人瞩目的候选材料。PBAs的吸附能力与介观结构和间隙位点密切相关。为了设计一种具有大量间隙位点的中空PBA，传统的中空方法并不适用，因为加工具有大量间隙位点的特定PBAs存在困难。在这项工作中，我们采用了一种合理的策略，即首先通过配位复制形成“金属氧化物”@“PBA”核壳结构，然后利用温和蚀刻去除金属氧化物核，最终得到中空PBA。所获得的中空PBA具有高结晶度和大量间隙位点，在短时间（10分钟）内对铯离子表现出超强吸附性能（221.6 mg/g）。
