Preparation of metal organic framework derived materials CoFe2O4@NC and its application for degradation of norfloxacin from aqueous solutions by activated peroxymonosulfate. (July 2021)

• Record Type: Journal Article
• Authors: Fan, Yan; Liu, Yanru; Hu, Xiang; Sun, Zhirong
• Is Part Of: Chemosphere. Volume 275(2021)
• Publication Date: 2021-07
• Subjects: Metal organic framework -- Peroxomonosulfate -- Norfloxacin -- Radical -- Oxidative degradation -- Water treatment; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.130059
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The metal organic framework derived materials (CoFe2 O4 @NC) activated peroxymonosulfate (PMS) to degrade Norfloxacin (NOR) owing to the characteristics of high surface area (109.658 m 2 g −1 ) and abundant mesoporous structure. The characterization results demonstrated that the optimal ratio of bimetal and of bimetallic to organic ligands (M/O) had good crystal structure and stability (Fe/Co = 3:1, M/O = 2:1). Moreover, NOR (10 mg L −1 ) removal of 98.78% was achievable in 60 min with an optimum concentration of PMS (0.32 mM) and dosage of CoFe2 O4 @NC (0.1 g L −1 ). The radical quenching results suggested that SO4 · -, ·OH and 1 O2 functioned in the presence of the system certificated by XPS spectra. The presence of Cl − and CO3 2− /HCO3 − promoted the catalyst reaction. The recoverability revealed high removal efficiency of NOR of 93.55% could still be maintained. Furthermore, four pathways of NOR degradation were proposed, including dehydroxylation, defluorination, quinolone group conversion and piperazine ring transformation, which were attributed to the synergy of reactive oxygen species. The above results highlight that the method is of great significance to the practical application of heterogeneous catalysts in aqueous solutions. Graphical abstract: Image 1 Highlights: The catalysis performance was strengthened when NH2 -BDC as internal source. The leaching of Co was effectively reduced with the synergy of Fe and Co. CoFe2 O4 @NC shows high stability and high activity in the catalytic reaction. SO4 · - and 1 O2 have played an important role in the catalytic process.