Hybrid grafted ion exchanger for decontamination of radioactive cesium in Fukushima Prefecture and other contaminated areas

The Volume Reduction Method of Radioactively-Contaminated Plant Waste through Extraction and Removal of Radioactive Cesium

“…Cesium adsorbents were synthesized with immobilization of ammonium molybdophosphate on polyethylene/polypropylene nonwoven fabric by radiation-induced grafting method 27) . The nonwoven fabric irradiated with 2 MeV electron beam at 3 mA with the dose of 50 kGy was soaked into a monomer solution under reduced pressure, which was mixed with glycidyl methacrylate, dimethyl sulfoxide, Tween 80 and crosslinking agents.…”

“…We have also developed radioactive cesium adsorbents based on a nonwoven fabric in which ammonium molybdophosphate (AMP) is supported by radiation-induced grafting method 27) . AMP has adsorption selectivity for cesium ions [28][29][30] and therefore the adsorbent is able to capture cesium ions selectively from environmental water in spite of much amount of coexistent ions such as potassium ions, sodium ions.…”

“…The cesium ions absorbed by the adsorbent is able to be eluted, and this can make the amount of contaminated wastes of used adsorbents reduced unlike other cesium adsorbents such as zeolites. The adsorbents have been already applied to cesium removal for environmental water and domestic use of water 27,31,32) In this study, cesium removal tests of the leaching water from the contaminated plant wastes were examined with molybdophosphate type adsorbents synthesized by radiationinduced grafting method. In addition to the decontamination tests, decolorization tests of the leaching water were examined with amine type radiation graft adsorbents for water discharge.…”

“…In another respect of the decontamination works, the total volume of contaminated wastes has been estimated to be [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] An example of structure of temporary storage site. million cube meters and must be volume-reduced before transfer to interim storage facility.…”

Removal of radioactive cesium, strontium, and iodine from natural waters using bentonite, zeolite, and activated carbon

“…The removal of radioactive materials from a solution has previously been investigated, using artificial polymers [7], bentonite [8], zeolite [9,10], and activated carbon [11,12]. In such research, radioactive traces would be suitable for use as materials because the diversity and changes in their chemical forms generally have no effect upon radiation counting and analysis.…”