Preparation of magnetic copper ferrite nanoparticle as peroxymonosulfate activating catalyst for effective degradation of levofloxacin

Abstract

The magnetic CuFe2O4 nanoparticles were successfully synthesized with a coprecipitation method at 500 °C calcination temperature, which were utilized to degrade levofloxacin (LEV) as peroxymonosulfate (PMS) activator. The structure and composition of nanocatalyst were characterized by a series of methods, including Scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, Vibrating sample magnetometer and Thermogravimetric analysis. The effect of the PMS concentration, the catalyst dosage, the LEV initial concentration, the pH value and the inorganic anions on the LEV degradation was also explored. The results revealed that the designed CuFe2O4/PMS system had high activity and excellent stability in the complex conditions. The degradation efficiency of LEV still reached above 80% after four recycles of CuFe2O4 catalyst. The reactive species quenching experiments and electron paramagnetic resonance analysis suggested the existence of superoxide radicals, single oxygen, hydroxy radicals and sulfate radicals, and the first two were dominant radical oxygen species. Based on the mechanism analyses, the efficient degradation of LEV was probably due to the continuous generation of reactive species under the condition of Fe (III)/Fe (II) and Cu (II)/Cu (I) redox cycles. The research provided a reasonable reference for the PMS activation mechanism based spinel-type ferrite catalysis.

Preparation of Bimetallic CoFe@CSC-700 Carbonated Microspheres and Activated Peroxymonosulfate for Degradation of Levofloxacin

“…This further indicated that CoFe@CSC-700 has good reusability and high water stability in the PMS reaction system and has strong potential for environmental applications. Table S1 listed the performance comparison of CoFe@CSC-700 with other previously reported catalysts for LEV degradation [46][47][48][49][50][51][52]. As can be seen from Table S1, CoFe@CSC-700 was able to achieve a higher LEV removal rate in a shorter period at a lower catalyst dosage and PMS concentration than the catalysts prepared in other studies, suggesting that the catalyst has superior performance and greater potential application prospects for treating LEV pollution in water.…”

Simple synthesis of mesoporous ferrite materials as magnetic adsorbents for phosphate removal

“…The synthesis of mesoporous CuFe 2 O 4 powder was carried out by a procedure as described in a previous work [ 16 ] , but without annealing at high temperature due to some modification. Briefly, mixed reagents of Fe 2 (SO 4 ) 3 and CuSO 4 .5H 2 O (analytical reagent, purchased from Xilong Scientific Co.) were vigorously stirred in distilled water to obtain 100 mL solution containing Fe 3+ ion (20 mmol) and Cu 2+ ion (10 mmol).…”