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Impregnation structure of cobalt ferrocyanide microparticles by the polymer chain grafted onto nylon fiber

ABSTRACT At Tokyo Electric Power Company (TEPCO) Fukushima Daiichi nuclear power plant (NPP), water contaminated with radionuclides such as Cs-137 and Sr-90 has been stored in tanks and seawater-intake area. We have prepared cobalt-ferrocyanide-impregnated fibers via four steps: the grafting of an epoxy-group-containing monomer, the conversion of the epoxy group into positively charged groups, the binding of ferrocyanide ions ([Fe(CN)6]4−), and the precipitation of cobalt ferrocyanide (Co2[Fe(CN)6]) by contact with cobalt ions. However, the impregnation structure of cobalt ferrocyanide microparticles onto the fiber remains unclear. Here, we describe the impregnation structure from the results of rebinding [Fe(CN)6]4− to the cobalt-ferrocyanide-impregnated fiber. The amount of [Fe(CN)6]4− re-bound onto the fiber was found to decrease with increasing amount of Co2[Fe(CN)6] initially impregnated. This suggests that the microparticles of cobalt ferrocyanide become entangled with the grafted polymer chains via multipoint electrostatic interactions.