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Unraveling the time evolution and post mortem changes of nanometric MnOOH during in situ oxidation of ciprofloxacin by activated peroxymonosulfate.

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Title: Unraveling the time evolution and post mortem changes of nanometric MnOOH during in situ oxidation of ciprofloxacin by activated peroxymonosulfate.
Authors: Núñez-de la Rosa, Yeison1 (AUTHOR), Durango, Luis Guillermo Cuadrado1 (AUTHOR), Forim, Moacir Rossi1 (AUTHOR), Nascimento, Otaciro Rangel2 (AUTHOR), Hammer, Peter3 (AUTHOR), Aquino, José M.1 (AUTHOR) jmaquino@ufscar.br
Source: Applied Catalysis B: Environment & Energy. Jun2023, Vol. 327, pN.PAG-N.PAG. 1p.
Subjects: Ciprofloxacin, Peroxymonosulfate, X-ray photoelectron spectroscopy, Electric conductivity, Charge exchange, Charge transfer, Oxidation
Abstract: Nanometric MnOOH compound was synthesized by a green approach, characterized, and used to remove ciprofloxacin (CIP) antibiotic by in situ chemical oxidation using peroxymonosulfate (PMS). The effects of varying concentrations of MnOOH, PMS and pH, on morphological, structural, chemical, and electrochemical changes were studied during and after the experiments. The CIP molecule was completely oxidized and partially mineralized (>60%) after 6 h under acidic conditions. The mechanism of CIP degradation was induced by PMS activated oxidants (HO• and 1O 2) and, to a lesser extent, directly on the surface of MnOOH. The latter process was evidenced by transmission electron microscopy showing the formation of an amorphous shell (MnO 2) over MnOOH crystallites, as verified using X-ray photoelectron spectroscopy and the subsequent increase of the charge transfer resistance that hindered a further electron transfer to the PMS oxidant. Such behavior is recoverable when using a freshly prepared PMS solution. [Display omitted] • MnOOH was synthesized by a green approach to remove ciprofloxacin antibiotic using PMS. • Time evolution and post mortem analyses revealed an amorphous MnO 2 shell. • Amorphous shell characterized by HRTEM led to a charge transfer resistance increase. • Low electric conductivity hindered further electron transfer ceasing PMS consumption. • MnOOH performance is recovered when using a freshly prepared PMS solution. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Nanometric MnOOH compound was synthesized by a green approach, characterized, and used to remove ciprofloxacin (CIP) antibiotic by in situ chemical oxidation using peroxymonosulfate (PMS). The effects of varying concentrations of MnOOH, PMS and pH, on morphological, structural, chemical, and electrochemical changes were studied during and after the experiments. The CIP molecule was completely oxidized and partially mineralized (>60%) after 6 h under acidic conditions. The mechanism of CIP degradation was induced by PMS activated oxidants (HO• and 1O 2) and, to a lesser extent, directly on the surface of MnOOH. The latter process was evidenced by transmission electron microscopy showing the formation of an amorphous shell (MnO 2) over MnOOH crystallites, as verified using X-ray photoelectron spectroscopy and the subsequent increase of the charge transfer resistance that hindered a further electron transfer to the PMS oxidant. Such behavior is recoverable when using a freshly prepared PMS solution. [Display omitted] • MnOOH was synthesized by a green approach to remove ciprofloxacin antibiotic using PMS. • Time evolution and post mortem analyses revealed an amorphous MnO 2 shell. • Amorphous shell characterized by HRTEM led to a charge transfer resistance increase. • Low electric conductivity hindered further electron transfer ceasing PMS consumption. • MnOOH performance is recovered when using a freshly prepared PMS solution. [ABSTRACT FROM AUTHOR]
ISSN:09263373
DOI:10.1016/j.apcatb.2023.122439