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To remove cesium ions from water and soil, a novel adsorbent was synthesized by following a one-step co-precipitation method and using non-toxic raw materials. By combining ammonium-pillared montmorillonite(MMT) and magnetic nanoparticles(Fe_3O_4), an MMT/Fe_3O_4 composite was prepared and characterized. The adsorbent exhibited high selectivity of Cs~+ and could be rapidly separated from the mixed solution under an external magnetic field. Above all, the adsorbent had high removal efficiency in cesium-contaminated samples(water and soil) and also showed good recycling performance, indicating that the MMT/Fe_3O_4 composite could be widely applied to the remediation of cesium-contaminated environments. It was observed that the pH, solid/liquid ratio and initial concentration affected adsorption capacity. In the presence of coexisting ions, the adsorption capacity decreased in the order of Ca~(2+)> Mg~(2+)> K~+> Na~+, which is consistent with our theoretical prediction. The adsorption behavior of this new adsorbent could be expressed by the pseudo-second-order model and Freundlich isotherm. In addition, the adsorption mechanism of Cs~+ was NH_4~+ ion exchange and surface hydroxyl group coordination, with the former being more predominant.
To remove cesium ions from water and soil, a novel adsorbent was synthesized by the following one-step co-precipitation method and using non-toxic raw materials. By combining ammonium-pillared montmorillonite (MMT) and magnetic nanoparticles (Fe_3O_4) The adsorbent exhibited high selectivity of Cs ~ + and could be rapidly separated from the mixed solution under an external magnetic field. Above all, the adsorbent had high removal efficiency in cesium-contaminated samples (water and soil ) and also showed good recycling performance, indicating that the MMT / Fe_3O_4 composite could be widely applied to the remediation of cesium-contaminated environments. It was observed that the pH, solid / liquid ratio and initial concentration affected adsorption capacity. The adsorption capacity decreased in the order of Ca ~ (2 +)> Mg ~ (2 +)> K ~ +> Na ~ +, which is consistent with our theoretical prediction. avior of this new adsorbent could be expressed by the pseudo-second-order model and Freundlich isotherm. In addition, the adsorption mechanism of Cs ~ + was NH_4 ~ + ion exchange and surface hydroxyl group coordination, with the former being more predominant.