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Interaction of ZIF-8 with Cu2+ in Water Solutions for Remediation Applications

Ludovico Giuseppe Barbataa, Emanuele Sangiorgia, Martina Maria Calvinoa, Francesco Armettab,c, Giuseppe Lazzaraa, Maria Luisa Saladinob,c, Michelangelo Scopellitia,d, Franco Mario Gelardia, Simonpietro Agnelloa,d, and Gianpiero Buscarinoa,*   

  1. aDipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Via Archirafi, 36,I-90123 Palermo, Italy;
    bDipartimento Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche - STEBICEF,Università di Palermo, Viale delle Scienze Ed.17, I-90128 Palermo, Italy;
    cCNR—Istituto per i Processi Chimico Fisici, Viale Ferdinando Stagno D’Alcontres 37,98158 Messina, Italy;
    dATEN Center, University of Palermo, Viale delle Scienze Ed. 18, 90128, Palermo, Italy
  • Received:2023-10-13 Accepted:2023-11-17
  • Contact: Email: gianpiero.buscarino@unipa.it (G. B.)

Abstract: Water pollution is a global environmental problem and now more topical than ever. Among several pollutants, heavy metals are of particular interest due to their toxicity and high bioaccumulation capacity. Metal-organic frameworks (MOFs) are exceptional adsorbents for capturing metal ions in water. Between them, ZIF-8 has high sequestration capacity of copper ions in water, but the capture mechanism remains unclear. The scope of this work is to investigate the interaction of ZIF-8 with copper ions in aqueous solution at pH = 7, discriminating between effects due to water, copper and those resulting from their concomitant presence. Several samples were prepared dispersing a certain amount of ZIF-8 in an aqueous Cu2+ solution at a fixed concentration in the range between 0—300 mg/L. X-ray diffraction, Raman spectroscopy, gas porosimetry, thermogravimetry, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) were used to evaluate the structural features of the ZIF-8 before and after Cu2+ capture. Our results indicates that ZIF-8 is capable to capture high amounts of Cu2+, but in aqueous solution it undergoes a dissolution and reorganization process that affect its applications in simply powder form.

Key words: ZIF-8, water remediation, metal-organic frameworks, heavy metals, pollution

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