Magnetic mesoporous Co/Ni ZIF-derived core-shell hollow nanocages for efficient removal of organic pollutants

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Abstract

In view of the urgent need for efficient and low-cost treatment of organic pollutants in printing and dyeing wastewater, magnetic porous adsorption materials have received extensive attention due to their advantages of high efficiency and reusability. Herein, magnetic bimetallic zeolitic imidazolate framework (mZIFs) nanoparticles with Fe 3 O 4 cores were firstly synthesized as a precursor. Subsequently, the novel hollow mZIFs core-shell nanocages (defined as mNCs) were developed via a facile etching method with tannic acid for the efficient removal of organic pollutants from wastewater. The mNCs demonstrated exceptional adsorption capacities, reaching up to 879.49 mg/g for methylene blue (MB) and 262.50 mg/g for tetracycline hydrochloride (TC) at 303 K, with adsorption behavior conforming to the pseudo-second-order kinetic model and the Langmuir isotherm. Thermodynamic analysis revealed that the adsorption of MB and TC by mNCs is a spontaneous and endothermic process. The regenerating rate of the mNCs for MB removal was over 80% even after five adsorption-desorption cycles. These results highlight the potential of mNCs as a highly efficient and reusable adsorbent for the removal of organic contaminants in wastewater treatment applications.

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