A new type of Cu
II ion sorbents is presented. These are obtained by CaCO
3 mineralization from supersaturated solutions on gel‐like cross‐linked polymeric beads as insoluble templates. A divinylbenzene–ethylacrylate–acrylonitrile cross‐linked copolymer functionalized with weakly acidic, basic, or amphoteric functional groups has been used, as well as different initial inorganic concentrations and addition procedures for CaCO
3 crystal growth. The morphology of the new composites was investigated by SEM and compared to that of the unmodified beads, and the polymorph content was established by X‐ray diffraction. The beads, before and after CaCO
3 mineralization, were tested as sorbents for Cu
II ions. The newly formed patterns on the bead surface after Cu
II sorption were observed by SEM, and the elemental distribution on the composites and the chemical structure of crystals after interaction with Cu
II were investigated by EDAX elemental mapping and by FTIR‐ATR spectroscopy, respectively. The sorption capacity increased significantly after CaCO
3 crystals growth on the weak anionic bead surface (up to 1041.5 mg Cu
II/g sample) compared to that of unmodified beads (491.5 mg Cu
II/g sample).
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