Synthesis of magnetic Fe3O4@ZIF-67 nanocomposite for sustainable removal of malachite green from water

The development of high-capacity and easily separable adsorbents is crucial for efficient dye wastewater treatment. Herein, a magnetic Fe 3 O 4 @ZIF-67 nanocomposite was synthesized via a facile in situ method to enhance its separation and recovery capabilities. The characterization results confirmed the successful synthesis of this nanocomposite. The batch adsorption experiments demonstrated that its adsorption capacity reached as high as 949.5 mg·g −1 . This process can be well described by the Langmuir and pseudo-second-order models, indicating it is a single-layer chemical adsorption. The thermodynamic studies revealed the adsorption to be spontaneous and endothermic. This work not only presents Fe 3 O 4 @ZIF-67 as a highly efficient and recyclable adsorbent for malachite green (MG) but also validates the strategy of constructing magnetic MOF-based composites for practical environmental remediation.