NOVEL COMPOSITE ADSORBENT BASED ON ION EXCHANGE RESIN WITH FERROCYANIDE PHASE FOR SELECTIVE RE-MOVAL OF CESIUM RADIONUCLIDES
Keywords:
composite adsorbent, ion exchange resin, potassium-copper ferrocyanide, selectivity, 137Cs, liquid radioactive waste.Abstract
The development of sorption technologies for the removal, separation, and concentration of radionuclides is an actual problem. In this respect the development of modern fabrication approaches of efficient adsorbents become especially relevant nowadays. Composite adsorbents with a sorption-active inorganic phase are of particular interest for selective removal of radionuclides. Ion exchange resins are a promising solid support matrix for fabrication of composite adsorbents by formation of inorganic nanoparticles on the surface/inside polymer granules by one stage experiment in situ. This article presents the experimental results on the fabrication of novel composite adsorbent based on macroporous polystyrene resin with sulfonic acid groups by in situ formation of potassium-nickel ferrocyanide phase and its application for selective removal of cesium ions from the model solu-tions with high concentrations of competitive sodium ions. The obtained results of X–ray diffraction and scanning electron-microscopy studies con-firm the formation of a ferrocyanide phase on the surface of polymer granules in the form of dense uniform layer of nanoscaled aggregates of potas-sium-copper ferrocyanide. Sorption experiments showed that composite polymer granules with the ferrocyanide phase are characterized by high selectivity to cesium ions in the presence of a significant excess of competitive sodium ions. The performed studies allow concluding that the synthe-sized composite adsorbent based on macroporous polymer granules with the ferrocyanide phase is of interest for practical use in sorption purifica-tion of natural waters and technological solutions from cesium radionuclides.
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