Preparation of Prussian Blue-loaded Adsorbents and Their Application for the Removal of Radioactive Cesium

Abstract

The removal of radioactive Cs from aquatic environments following nuclear disasters is critical for environmental remediation. Prussian blue （PB） and cobalt ferrocyanide （FC） are well-known Cs adsorbents; however, their fine particle sizes hinders their separation from water after adsorption. To overcome this problem, PB and FC were immobilized on various adsorbents, including alginate beads, cellulose beads, viscose rayon, and bubble wrap. The PB-loaded bubble wrap exhibited the highest Cs adsorption efficiency. Furthermore, potassium-modified PB （KPB） exhibited a higher adsorption capacity than unmodified PB, demonstrating the effectiveness of potassium as an additive. The adsorption behavior was well described by the Langmuir adsorption isotherm model. Kinetic analysis revealed that Cs adsorption onto the KPB-loaded bubble wrap followed a pseudo-second-order rate equation law, indicating chemisorption was the main mechanism. These results show the KPB-loaded bubble wrap is a stable and effective adsorbent for Cs removal.