Zinc Based Metal-Organic Frameworks as Ofloxacin Adsorbents in Polluted Waters: ZIF-8 vs. Zn 3 (BTC) 2

Doretta Capsoni, Giulia Guerra, Constantin Puscalau, Federica Maraschi, Giovanna Bruni, Francesco Monteforte, Antonella Profumo and Michela Sturini
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Doretta Capsoni: C.S.G.I. (Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase) & Department of Chemistry, Physical Chemistry Section, University of Pavia, 27100 Pavia, Italy
Giulia Guerra: Department of Chemistry, University of Pavia, 27100 Pavia, Italy
Constantin Puscalau: C.S.G.I. (Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase) & Department of Chemistry, Physical Chemistry Section, University of Pavia, 27100 Pavia, Italy
Federica Maraschi: Department of Chemistry, University of Pavia, 27100 Pavia, Italy
Giovanna Bruni: C.S.G.I. (Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase) & Department of Chemistry, Physical Chemistry Section, University of Pavia, 27100 Pavia, Italy
Francesco Monteforte: C.S.G.I. (Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase) & Department of Chemistry, Physical Chemistry Section, University of Pavia, 27100 Pavia, Italy
Antonella Profumo: Department of Chemistry, University of Pavia, 27100 Pavia, Italy
Michela Sturini: Department of Chemistry, University of Pavia, 27100 Pavia, Italy

IJERPH, 2021, vol. 18, issue 4, 1-17

Abstract: Two different zinc-based metal-organic frameworks (MOFs) were investigated to remove one of the most used fluoroquinolone antibiotic, Ofloxacin (OFL), from polluted water. The most common zeolitic imidazolate framework-8 (ZIF-8) and the green Zn(II) and benzene-1,3,5-tri-carboxylate (Zn 3 (BTC) 2 ) were prepared through a facile synthetic route and characterized by means of Fourier-Transform Infrared (FT-IR) Spectroscopy, X-ray Powder Diffraction (XRPD), and Scanning Electron Microscopy (SEM) analyses. The two MOFs were compared in terms of both adsorption and kinetic aspects under real conditions (tap water, natural pH). Results showed that OFL was adsorbed in remarkable amounts, 95 ± 10 and 25.3 ± 0.8 mg g ?1 on ZIF-8 and Zn 3 (BTC) 2 , respectively, following different mechanisms. Specifically, a Langmuir model well described the ZIF-8 profile, while for Zn 3 (BTC) 2 , cooperative adsorption occurred. Moreover the kinetic results were quite different, pseudo-second-order and sigmoidal, respectively. The suitability of ZIF-8 and Zn 3 (BTC) 2 as adsorbent phases for water depollution was tested on tap water samples spiked with OFL 10 µg L ?1 . The obtained removal efficiencies, of 88% for ZIF-8 and 72% for Zn 3 (BTC) 2 , make these materials promising candidates for removing fluoroquinolone antibiotics (FQs) from polluted waters, notwithstanding their limited reusability in tap water, as demonstrated by in-depth characterization of the two MOFs after usage.

Keywords: fluoroquinolone antibiotic; zinc-based metal-organic frameworks; adsorption; wastewater treatment; MOFs reusability; polluted waters (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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