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.
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| http://dx.doi.org/10.1016/j.chemosphere.2024.141570 | DOI Listing |
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