Abstract Prussian blue (PB) is known to selectively adsorb cesium (Cs), with a high adsorption efficiency. However, it is difficult to collect it after adsorption, which increases the risk of secondary environmental pollution. In this study, covalent organic polymers (COPs) were used to reform the surface of powdered activated carbon (PAC) particles in order to stably immobilize PB, with the aim of developing an adsorbent impregnated with PB (COP-PAC-PB). PAC particles reformed with COPs (COP-PAC) were analyzed using TEM (EDS) and FT-IR techniques, and it was found that COPs were successfully synthesized on the surface of COP-PAC particles. COP-PAC-PB particles were synthesized by reacting PAC particles with iron(III) chloride and potassium ferrocyanide solutions in order, to synthesize PB within the pores of COPs (in situ). COP-PAC-PB particles were analyzed using XRD and FT-IR techniques, and peaks showing the general characteristics of PB were observed, which indicated that PB existed on the surface of COP-PAC-PB particles. PB was synthesized on the surface of the non-reformed groups (PAC and Ox-PAC) using the same method. In addition, UV–vis analysis was performed to compare the characteristics of PB desorbed from the non-reformed and reformed groups immediately after synthesizing and washing them. In the non-reformed groups (PAC-PB and Ox-PAC-PB), a large amount of PB was desorbed while they were washed 6 times. For COP-PAC-PB, however, a small amount of PB was desorbed during the first washing, but no desorbed PB was observed thereafter. The maximum Cs adsorption capacity of COP-PAC-PB particles was 19 mg/g, and its removal efficiency of radioactivity cesium (Cs-137, 60 Bq/kg) was 97.3%. In this study, the surface of PAC particles was effectively reformed using COPs, and an adsorbent to which PB was stably immobilized was developed.

中文翻译：

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使用共价有机聚合物 (COP) 对粉状活性炭 (PAC) 的表面进行重整，并合成普鲁士蓝浸渍吸附剂以净化放射性铯

摘要 普鲁士蓝 (PB) 以选择性吸附铯 (Cs) 为研究对象，具有较高的吸附效率。但吸附后难以收集，增加了二次环境污染的风险。在这项研究中，共价有机聚合物 (COP) 被用于改造粉末活性炭 (PAC) 颗粒的表面以稳定固定 PB，目的是开发一种浸渍 PB 的吸附剂 (COP-PAC-PB)。使用 TEM (EDS) 和 FT-IR 技术分析了用 COPs (COP-PAC) 重整的 PAC 颗粒，发现 COPs 成功地合成在 COP-PAC 颗粒表面。COP-PAC-PB 颗粒是通过使 PAC 颗粒与氯化铁 (III) 和亚铁氰化钾溶液反应来合成的，以便在 COP 的孔内（原位）合成 PB。使用XRD和FT-IR技术分析COP-PAC-PB颗粒，观察到显示PB一般特征的峰，这表明PB存在于COP-PAC-PB颗粒表面。使用相同的方法在未重整基团（PAC 和 Ox-PAC）的表面合成 PB。此外，还进行了紫外-可见分析，以比较未重整组和重整组在合成和洗涤后立即解吸的 PB 的特性。在未重整组（PAC-PB 和 Ox-PAC-PB）中，在洗涤 6 次时大量 PB 被解吸。然而，对于 COP-PAC-PB，在第一次洗涤期间有少量 PB 解吸，但此后没有观察到解吸 PB。COP-PAC-PB 颗粒的最大 Cs 吸附容量为 19 mg/g，对放射性铯（Cs-137，60 Bq/kg）的去除率为97.3%。在这项研究中，使用 COP 有效地改造了 PAC 颗粒的表面，并开发了一种可稳定固定 PB 的吸附剂。