Fabrication of Prussian blue/polydopamine layers on polyacrylonitrile membranes for efficient adsorption of cesium

Adsorption is an effective method for separating radioactive cesium (Cs 137 ) from solutions.Herein, polydopamine (PDA) film was fabricated on porous polyacrylonitrile (PAN) membranes, and then Prussian blue film was in-situ prepared on PDA.It was found for the first time that the PDA/PAN membrane showed good adsorption capacity for Cs + (0.074 mmol g -1 , 25°C) in mixed alkali metal ions solution with Cs + /Li + selectivity of 7.5.The PB/PDA/PAN membranes displayed excellent adsorption performance for Cs + (0.498 mmol g -1 , 25°C) in mixed alkali metal ions solution with high selectivity (Cs + /Li + = 42.3,Cs + /Na + = 31.4,and Cs + /K + = 18.4), as well as excellent stability even under ultrasonic conditions.