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 eco-systems. Herein, the layer-by-layer assembled ferrocyanide composite fibers were fabricated based on the co-ordination of phytic acid (PA) and Zn2+. 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 to-wards Cs+ with the presence of various co-existing ions, which was further proved in geothermal water (dis-tribution coefficient, Kd = 2.5 x 104 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.