Layer-by-layer assembled ferrocyanide composite fibers for highly efficient removal of cesium

The leaked radioactive cesium is urgent to be eliminated due to the endangerment of human health and ecosystems. Herein, the layer-by-layer assembled ferrocyanide composite fibers were fabricated based on the coordination of phytic acid (PA) and Zn 2+ . The obtained Cs-adsorptive fibers (ZnFC/PA/PSF) showed the top-class adsorption capacity (524.67 mg/g) and fast kinetics (25 min). In addition, it exhibited excellent selectively towards Cs + with the presence of various co-existing ions, which was further proved in geothermal water (distribution coefficient, K d  = 2.5 × 10 4 mL/g). Moreover, ZnFC/PA/PSF displayed favorable pH stability with negligible dissolution of Zn and Fe, and satisfied reusability after ten adsorption cycles. This work demonstrates that the ZnFC/PA/PSF composite fibers are eco-friendly and cost-effective adsorbent for the treatment of the Cs-contaminated water.