Eun Semin, Kim Bokyung, Kim Minsun, Ryu Jungho, Han Young-Soo, Kim Soonhyun
Department of Interdisciplinary Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Republic of Korea.
Division of Energy & Environmental Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Republic of Korea.
Water Res. 2025 Jan 1;268(Pt B):122700. doi: 10.1016/j.watres.2024.122700. Epub 2024 Oct 26.
Extensive efforts were made to remove radioactive cesium (Cs) from the environment, with Prussian blue analogs (PBAs) emerging as highly selective and efficient materials for Cs removal. However, limited studies systematically compared Cs adsorption across different transition metals in PBA. This study investigates the influence of the choice of transition metal ion (Co, Cu, Fe, Mn, Ni, Zn) on Cs adsorption mechanisms and efficiency. PBAs were synthesized and characterized based on their specific surface area, ion exchange capacity, lattice parameter, and defect sites (as indicated by water molecule content). Cs adsorption mechanisms varied significantly with transition metals. In CoFe and FeFe PBAs, ion exchange with K dominated, while CuFe and MnFe PBAs, with more defect sites primarily used ion exchange between H and Cs. NiFe and ZnFe exhibited enhanced Cs adsorption under light irradiation, likely due to their light-absorbing properties facilitating a reduction reaction. The Langmuir adsorption isotherm was applied to model the adsorption behavior, confirming that each performance of PBA depends on the transition metal used. These findings suggest that PBAs with various transition metals can efficiently remove Cs under diverse environmental conditions by using distinct adsorption mechanisms.
人们为从环境中去除放射性铯（Cs）付出了巨大努力，普鲁士蓝类似物（PBAs）成为去除Cs的高选择性和高效材料。然而，系统比较不同过渡金属的PBA对Cs吸附情况的研究有限。本研究调查了过渡金属离子（Co、Cu、Fe、Mn、Ni、Zn）的选择对Cs吸附机制和效率的影响。基于比表面积、离子交换容量、晶格参数和缺陷位点（由水分子含量表示）对PBAs进行了合成和表征。Cs的吸附机制随过渡金属的不同而有显著差异。在CoFe和FeFe PBAs中，与K的离子交换占主导，而具有更多缺陷位点的CuFe和MnFe PBAs主要利用H和Cs之间的离子交换。NiFe和ZnFe在光照下表现出增强的Cs吸附，这可能是由于它们的吸光特性促进了还原反应。应用朗缪尔吸附等温线对吸附行为进行建模，证实PBA的各项性能取决于所使用的过渡金属。这些发现表明，具有不同过渡金属的PBAs可以通过不同的吸附机制在不同环境条件下有效地去除Cs。
