Electrochemical adsorption of cesium using a nickel hexacyanoferrate-doped porous carbon electrode

In present paper, a porous carbon composite electrode, doped with nickel hexacyanoferrate, was prepared for electrochemical removal of cesium ions from aqueous solutions. Based upon the applied voltage of −3 V, a 100% adsorption was achieved in 3 h for the initial Cs + concentration of 10 ppm in solution. The maximum capacity was 155.2 mg g −1 under optimized electrochemical conditions. The electrode was regenerated by applying a reverse voltage of 3 V. The removal efficiency remained 95% even after five consecutive adsorption–desorption cycles. The results suggested that the developed electrochemical method has strong potential for extracting cesium from aqueous solutions.