Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, 989-111 Daedukdaero, Yuseong, Daejeon, 34057, South Korea; Dept. of Chemistry, Sungkyunkwan University, Suwon, Kyeonggi-do, South Korea.
Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, 989-111 Daedukdaero, Yuseong, Daejeon, 34057, South Korea.
Chemosphere. 2019 Jun;224:776-785. doi: 10.1016/j.chemosphere.2019.02.199. Epub 2019 Mar 2.
A simple one-step approach for fabricating copper ferrocyanide-embedded magnetic hydrogel beads (CuFC-MHBs) was designed, and the beads were applied to the effective removal of cesium (Cs) and then magnetically separated from water. The polyvinyl alcohol (PVA)-coated CuFC (PVA-CuFC) was first synthesized using PVA as a stabilizer and subsequently embedded in magnetic hydrogel beads made of a cross-linked network between the PVA and magnetic iron oxide nanoparticles that was prepared through the simple dropwise addition of a mixed solution of PVA-CuFC, PVA and iron salt into an ammonium hydroxide solution. The synthesis and chemical immobilization of the PVA-CuFC in the magnetic beads were simple, facile and achieved in one pot, and the process is scalable and convenient for the large-scale treatment of Cs-contaminated water. The resulting CuFC-MHBs showed effective Cs removal performance with a high K value of 66,780 mL/g and excellent structural stability without the release of CuFC for at least 1 month and could be effectively separated from water by an external magnet. Moreover, the CuFC-MHBs selectively adsorbed Cs with high K values in the presence of various competing ions, such as in simulated groundwater (24,500 mL/g) and seawater (8290 mL/g), and maintained their Cs absorption ability in a wide pH range from 3 to 11. The convenient fabrication method and effective removal of Cs from various aqueous media demonstrated that the CuFC-MHBs have great potential for practical application in the decontamination of Cs-contaminated water sources caused by nuclear accidents and radioactive liquid waste in various nuclear industry fields.
设计了一种简单的一步法来制备嵌入亚铁氰化铜的磁性水凝胶珠（CuFC-MHBs），并将这些珠用于有效去除铯（Cs），然后从水中磁性分离。首先使用聚乙烯醇（PVA）作为稳定剂合成 PVA 包覆的亚铁氰化铜（PVA-CuFC），然后将其嵌入由 PVA 和磁性氧化铁纳米粒子之间的交联网络制成的磁性水凝胶珠中，该网络是通过将 PVA-CuFC、PVA 和铁盐的混合溶液简单滴加到氨水溶液中制备的。PVA-CuFC 在磁性珠中的合成和化学固定化过程简单、方便，一锅法即可完成，且该过程具有可扩展性，便于大规模处理含 Cs 的水。所得 CuFC-MHBs 表现出有效的 Cs 去除性能，K 值高达 66,780 mL/g，且结构稳定性极好，至少 1 个月内没有释放出 CuFC，可以通过外部磁铁有效地从水中分离。此外，在存在各种竞争离子（如模拟地下水（24,500 mL/g）和海水（8290 mL/g））的情况下，CuFC-MHBs 对 Cs 具有高 K 值的选择性吸附，并且在 pH 值范围从 3 到 11 之间保持其 Cs 吸收能力。从各种水介质中方便地去除 Cs 的方法以及有效的去除性能表明，CuFC-MHBs 在核事故引起的 Cs 污染水源以及各种核工业领域的放射性废液的去污方面具有很大的实际应用潜力。
