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Artur Dran'kov,Oleg Shichalin,Evgeniy Papynov,Alexey Nomerovskii,Vitaliy Mayorov,Vladimir Pechnikov,Andrei Ivanets,Igor Buravlev,Sofiya Yarusova,Alexey Zavjalov,Aleksey Ognev,Valeriya Balybina,Aleksey 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
The problem of water contamination by long-living cesium and strontium radionuclides is an urgentenvironmental issue. The development of facile and efficient technologies based on nanostructuredadsorbents is a perspective for selective radionuclides removal. In this regard, current work aimed toobtain the nanostructured magnetic zeolite composites with high adsorption performance to cesium andstrontium ions. The optimal conditions of hydrothermal synthesis were established based on XRD, SEMEDX, N2 adsorption-desorption, VSM, and batch adsorption experiment data. The role of chemicalcomposition, textural characteristics, and surface morphology was demonstrated. The monolayer ionexchange mechanism was proposed based on adsorption isotherm modeling. The highest Langmuiradsorption capacity of 229.6 and 105.1 mg/g towards cesium and strontium ions was reached forcomposite obtained at 90 C hydrothermal treatment. It was shown that magnetic characteristics ofzeolite composites allowing to separate spent adsorbents by a magnet from aqueous solutions
Papynov, E.K.,Belov, A.A.,Shichalin, O.O.,Buravlev, I. Yu,Azon, S.A.,Golub, A.V.,Gerasimenko, A.V.,Parotkina, Yu. А.,Zavjalov, A.P.,Tananaev, I.G.,Sergienko, V.I. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.7
In the present study, an original spark plasma sintering-reactive synthesis (SPS-RS) method for minerallike ceramic materials based on SrAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> feldspar-like skeleton structure was used for the first time, promising solid-state matrices for reliable immobilization of high-energy <sup>90</sup>Sr. The method is based on the "in-situ" reaction of a mixture of SrO, Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> oxides when heated by a unipolar pulsed current under compacting pressure. The phase and elemental composition structure were studied. The dynamics of the consolidation of the reaction mixture of oxides was studied in the range of 900-1200 ℃. The study found the temperature of the high-speed (minutes) SPS-RS formation of single-phase SrAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> composition ceramic in the absence of intermediate reaction products with a relative density of up to 99.2% and compressive strength up to 145 MPa and a strontium leaching rate of 10<sup>-4</sup>g/cm<sup>2</sup>·day.