Facile synthesis of mesoporous magnetic AMP polyhedric composites for rapid and highly efficient separation of Cs+ from water

Mesoporous magnetic AMP polyhedric composites mag-AMP (AMP/Fe3O4) with highly efficient Cs+ adsorption capacity has been successfully explored by means of a simple interface-induced co-assembly method at room temperature for the first time. Taking advantage of the mesoporous material and magnetic composite, mag-AMP composites show efficient Cs+ adsorption capability (maximum adsorption capacity, 83.33 mg/g) and reach an equilibrium state within only 5 min. The Langmuir isotherm model fitted better with the adsorption data than Freundlich isotherm model. The fast adsorption process follows pseudo-second-order kinetics. The obtained adsorbent also shows high Cs+-sieving selectivity and could be applied in kinds of solutions even in the strong acidic medium. It could also be used effectively to separate Cs+ from wastewater even with trace (mu g/L) concentrations. The removal mechanism of Cs+ for mag-AMP may be the joint action of both chemisorption (NH4+-exchange) and physisorption due to the weak van der waals forces. The adsorbent was inlaid with Fe3O4 NPs which make it easily recovered from polluted solution with magnetic separation. More importantly, the synthesis of mag-AMP is simple and low-cost with environmental friendly raw. Thus, the adsorbent of mag-AMP has extensive applicability for the removal of Cs+ from nuclear wastewater. (C) 2017 Elsevier B.V. All rights reserved.