Degradation of ciprofloxacin using hematite/MOF nanocomposite as a heterogeneous Fenton-like catalyst: A comparison of composite and core−shell structures. (October 2021)

• Record Type: Journal Article
• Authors: Hashemzadeh, Bayram; Alamgholiloo, Hassan; Noroozi Pesyan, Nader; Asgari, Esrafil; Sheikhmohammadi, Amir; Yeganeh, Jaber; Hashemzadeh, Hassan
• Is Part Of: Chemosphere. Volume 281(2021)
• Publication Date: 2021-10
• Subjects: Hematite-MOF -- Peroxymonosulfate -- Advanced oxidation processes -- Environmental remediation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.130970
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A novel strategy was described to fabricate hematite-MOF materials with morphologies (core-shell) and (composite) as an efficient peroxymonosulfate (PMS) activator for degrading ciprofloxacin (CIP) antibiotics. First, α-Fe2 O3 nanoparticles (NPs) with a size distribution range of 80 nm were prepared by surfactant-assisted reflux method. Then, cobalt-based metal-organic framework (ZIF-67) was grown onto the α-Fe2 O3 NPs with ultrasonic and solvothermal method, which can control the nanostructures morphology. The physicochemical properties of these nanostructures were probed by ATR-IR, WA-XRD, FESEM, VSM, TEM, and EDS spectroscopy. The results showed that all the added CIP (20 ppm) antibiotics were completely degraded in 30 min in the α-Fe2 O3 /ZIF-67 (0.10 g/L) and PMS (0.20 g/L) system with rate constant of 0.130 min −1 . To validate the merits of the α-Fe2 O3 /ZIF-67, α-Fe2 O3 @ZIF-67 core-shell nanostructures were also applied under similar conditions. The findings demonstrated that Co/Fe species within α-Fe2 O3 /ZIF-67 composite catalyzed PMS synergistically to the formation of the OH and SO4 − and 1 O2 for CIP degradation. Furthermore, α-Fe2 O3 /ZIF-67 showed good recyclability enabling facile separation of the catalyst from reaction mixtures using an external magnet. The current protocol can be a useful criterion in designing various Magnetic-MOF composites with controlled morphologies for environmental remediation. Graphical abstract: Image 1 Highlights: A novel strategy was described to fabricate hematite-MOF materials. α-Fe2 O3 /ZIF-67/PMS can efficiently catalyze the activation of peroxymonosulfate. SO4 − and OH radicals were the major reactive species for CIP degradation. Synergistic catalytic mechanism was proposed.