Batch and fixed-bed column studies for selective removal of cesium ions by compressible Prussian blue/polyurethane sponge.

In this work, compressible Prussian blue/polyurethane sponges (PB@PUS) for selective removal of cesium ions were prepared via an in situ radiation chemical route. The characterization results indicate that uniform PB nanoparticles were successfully synthesized and well dispersed on the porous skeleton of sponge. Batch and fixed-bed column experiments were detailedly conducted to investigate their adsorption performances. Batch adsorption experiments reveal that PB@PUS exhibited good selective removal property for cesium ions in a wide range of pH, whose maximal adsorption capacity and removal efficiency reached 68.6 mg g−1 and 99%, respectively. The adsorption processes could be described by the Langmuir isotherm adsorption model and pseudo-second-order adsorption kinetic model. The fixed-bed column experiments show that the breakthrough and exhaustion time obviously increased with the decrease of flow rate and initial cesium ions concentration. The breakthrough curves could be well fitted by the Thomas model and Yoon–Nelson model. The theoretical saturated adsorption capacity of PB@PUS-3 calculated from the Thomas model was 68.2 mg g−1. The as-prepared samples were light, stable and compressible, which can be applied in radioactive wastewater treatment. Compressible Prussian blue/polyurethane sponges for selective removal of cesium ions were prepared and detailedly studied via fixed-bed column/batch adsorption experiments.

在这项工作中，通过原位辐射化学方法制备了用于选择性去除铯离子的可压缩普鲁士蓝/聚氨酯海绵（PB@PUS）。表征结果表明，均匀的PB纳米粒子成功合成并良好地分散在海绵的多孔骨架上。详细进行了批量和固定床柱实验以研究它们的吸附性能。批量吸附实验表明，PB@PUS在较宽的pH范围内对铯离子表现出良好的选择性去除性能，其最大吸附容量和去除效率分别达到68.6 mg/g和99%。吸附过程可以用朗缪尔等温吸附模型和准二级吸附动力学模型来描述。固定床柱实验表明，穿透时间和耗尽时间随着流速和初始铯离子浓度的降低而明显增加。穿透曲线可以用托马斯模型和尹 - 尼尔森模型很好地拟合。根据托马斯模型计算出的PB@PUS - 3的理论饱和吸附容量为68.2 mg/g。所制备的样品质轻、稳定且可压缩，可应用于放射性废水处理。 通过固定床柱/批量吸附实验制备了用于选择性去除铯离子的可压缩普鲁士蓝/聚氨酯海绵并进行了详细研究。