![]() ![]() (i) The synergistic effect of the core–shell nanostructure improves the preconcentration ability at the interface between single MOFs. Specifically, the hybrid structure provides greater sensitivity as compared to the individual constituent (pristine NH 2-MIL-101(Al)) and the mixed state, which is ascribed to the rational optimization of the smart adsorbent based on the following two aspects. Moreover, the fluorescence of NH 2-MIL-101(Al) shows a Cu( II)-dependent change, causing this composite to possess superior selective/sensitive detection with a broad linear range (1.5–625 μM) and a low detection limit (0.17 μM) for Cu( II). Benefiting from the specific affinity of imidazole nitrogen in ZIF-8 toward Cu( II), the resultant NH shows high adsorption capacity (526.74 mg g −1). In this work, novel core–shell NH nanoflowers were successfully fabricated via an internal extended growth mode under the regulation of polyvinylpyrrolidone (PVP) to achieve this goal. The excessive accumulation of toxic copper species makes it imperative to develop smart dual-functional materials for the simultaneous removal and detection of Cu( II) in drinking water.
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