Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, 989-111 Daedukdaero, Yuseong, Daejeon, 34057, Republic of Korea; Quantum Energy Chemical Engineering, University of Science and Technology (UST), 217, Gajeong-ro, Daejeon, 34113, Republic of Korea.
Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, 989-111 Daedukdaero, Yuseong, Daejeon, 34057, Republic of Korea.
Chemosphere. 2024 Apr;353:141570. doi: 10.1016/j.chemosphere.2024.141570. Epub 2024 Mar 4.
Selective adsorption is the most suitable technique for eliminating trace amounts of Cs from various volumes of Cs-contaminated water, including seawater. Although various metal ferrocyanide (MFC)-functionalized magnetic adsorbents have been developed for the selective removal of Cs and magnetic recovery of adsorbents, their adsorption capacity for Cs remains low. Here, magnetic hierarchical titanium ferrocyanide (mh-TiFC) was synthesized for the first time for enhanced Cs adsorption. Hierarchical TiFC, comprising 2-dimensional TiFC flakes, was synthesized on SiO-coated magnetic FeO particles using a sacrificial TiO shell as a source of Ti via a reaction with ferrocyanide under acidic conditions. The resultant mh-TiFC exhibited the highest maximum adsorption capacity (434.8 mg g) and enhanced Cs selectivity with an excellent K value (6,850,000 mL g) compared to those of previously reported magnetic Cs adsorbents. This enhancement was attributed to the hierarchical structure, which reduced intracrystalline diffusion and increased the surface area available for direct Cs adsorption. Additionally, mh-TiFC (0.1 g L) demonstrated an excellent removal efficiency of Cs exceeding 99.85% for groundwater and seawater containing approximately 22 ppt Cs. Therefore, mh-TiFC offers promising applications for the treatment of Cs-contaminated water.
选择性吸附是从各种体积的含 Cs 污染水中（包括海水）去除痕量 Cs 的最适宜技术。尽管已经开发了各种金属亚铁氰化物（MFC）功能化磁性吸附剂来选择性去除 Cs 和磁性回收吸附剂，但它们对 Cs 的吸附容量仍然较低。本文首次合成了磁性分级钛亚铁氰化物（mh-TiFC）以增强 Cs 吸附。分层 TiFC 由 2 维 TiFC 薄片组成，在 SiO 涂覆的磁性 FeO 颗粒上合成，使用牺牲 TiO 壳作为 Ti 的来源，通过与酸性条件下的亚铁氰化物反应。与之前报道的磁性 Cs 吸附剂相比，所得 mh-TiFC 表现出最高的最大吸附容量（434.8mg g）和增强的 Cs 选择性，具有优异的 K 值（6,850,000mL g）。这种增强归因于分层结构，它减少了晶内扩散并增加了可用于直接 Cs 吸附的表面积。此外，mh-TiFC（0.1g L）对含约 22 ppt Cs 的地下水和海水表现出优异的去除效率，超过 99.85%。因此，mh-TiFC 为处理含 Cs 污染水提供了有前景的应用。
