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Cd( ii ) ion was used as template ion, and  N , N '-pyridine-2,6-di(2-methacrylamide) was used as the functional monomer. The experimental conditions for the synthesis of Cd( ii ) ion-imprinted composite membranes (Cd( ii )-IICMs) were optimized by the surface-imprinting method, and 25 Cd( ii )-IICM 1–25  and their corresponding non-imprinted composite membranes (NICM 1–25 ) were prepared. Then, the structures of the optimal membranes Cd( ii )-IICM 17  and NICM 17  were characterized by scanning electron microscopy, Brunner–Emmett–Teller, thermogravimetric analysis, contact angle analysis, and the effects of different adsorption conditions were studied. The adsorption behavior was analyzed by isothermal adsorption models and kinetic models. The permeation selectivity of Cd( ii )-IICM 17  towards Cd( ii ) ions was studied. Results of the experiment indicate that Cd( ii )-IICM 17  had excellent adsorption properties for Cd( ii ) ions with an imprinting factor of 2.15. The adsorption of Cd( ii ) ions in solution by Cd( ii )-IICM 17  and NICM 17  was in accordance with the Freundlich isothermal adsorption model and the pseudo-second-order kinetic model. In addition, in the presence of the competing ions Co( ii ), Ni( ii ), and Cu( ii ), Cd( ii )-IICM 17  showed good permeation selectivity for Cd( ii ) ions, and the permeation process followed a facilitated permeation mass-transfer mechanism. In summary, the Cd( ii )-IICM 17  prepared in this study has good application prospects for the separation and removal of Cd( ii ) ions from wastewater.

Synthesis of cadmium( ii ) ion-imprinted composite membrane with a pyridine functional monomer and characterization of its adsorption performance