Synthesis of mordenite and its composite material using chemical reagents for Cs decontamination

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Mordenite was synthesized using chemical reagents of amorphous SiO₂ and sodium aluminate without the addition of a template agent and a seed powder. The single phase of the mordenite was obtained for the Al/Si ratios of 0.085–0.120 as the starting material in the reaction temperature range of 170–200°C for 24 h. The cation exchange capacity (CEC) was ca. 180–210 cmol/kg and it increased with the Al/Si ratio. The Cs⁺ adsorption ability from 100 ppm Cs⁺ 100 mL solutions of water and seawater for the mordenite (1.0 g) was >99% and ca. 85–92%, respectively. A composite material consisting of the mordenite and magnetite (10, 20, 30 wt %) was synthesized for the magnetic collection. The total Cs decontamination rates using the magnetic collection material after the Cs⁺ adsorption in water were also higher than 95% for all the examined magnetite-containing composite materials.