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Mesoporous magnetic AMP polyhedric composites mag-AMP (AMP/Fe 3 O 4 ) 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 (µg/L) concentrations. The removal mechanism of Cs + for mag-AMP may be the joint action of both chemisorption (NH 4 + -exchange) and physisorption due to the weak van der waals forces. The adsorbent was inlaid with Fe 3 O 4 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. [ABSTRACT FROM AUTHOR]