Adsorption of cesium ion by Prussian blue filled in tube-in-tube hollow fiber membranes

Cs-137 and other radionuclides in the wastewater of nuclear energy have caused great harm to the environment and human body. Removed of these radionuclides has become one of focuses of research. Prussian blue (PB), as an excellent adsorbent for cesium ion, faces the difficulty in recovery from water after adsorption. In this article, PB powder was packed in tube-in-tube hollow fiber membranes to eliminate the problems of recovery and secondary pollution. The effects of one pass-through adsorption and cyclic adsorption in the adsorption of cesium ion were explored. In the one pass-through adsorption, the solution contacts with the adsorbent layer for a short time, resulting in a low adsorption capacity. For the cyclic adsorption, the adsorption capacity can reach 36.26 mg g(-1). With the increase of PES inner hollow fiber membranes, the flux increases while the adsorption capacity decreases. The permeation of solution through the PB layer favors the mass transfer of ion to the adsorbent. The tube-in-tube adsorption can solve the recovery problem of PB powder and also improve the adsorption efficiency.