Mechanistic insights into the reactive radicals-assisted degradation of sulfamethoxazole via calcium peroxide activation by manganese-incorporated iron oxide-graphene nanocomposite: Formation of radicals and degradation pathway

Date

2020-03-01

Author

Amina, Amina
Si, Xiongyuan
Wu, Kang
Si, Youbin
Yousaf, Balal

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

140
views

0
downloads

In this study, fabrication of manganese-incorporated iron oxide-graphene nanocomposite (rGO-FMBO) was reported for the efficient activation of CaO2 and generation of reactive radicals for the degradation of sulfamethoxazole (SMX). The effects of different systems, catalyst dosage, oxidant dosage, different pH and different reaction time on the degradation of SMX by rGO-APTMS-FMBO/CaO2 as well as the production of free radicals were also studied. Electron paramagnetic resonance (EPR) technique was used to detect and identify the radical species in this oxidation system and these radicals were further confirmed by scavenging studies with the addition of isopropanol (IPA) and methyl viologen (MV2+). The results indicated that the CaO2 could be activated by rGO-APTMS-FMBO efficiently for the effective degradation of SMX at neutral pH (P <= 0.01). The mechanism of the activation of CaO2 by rGO-APTMS-FMBO was that carbon dioxide radicals (CO2 center dot-) generated by rGOAPTMS-FMBO could activate the Ca0 2 to produce more hydroxyl radicals (HO center dot), which favored the SMX degradation. EPR studies showed that three types of free radicals HO center dot, CO2 center dot-, and CH3 center dot were generated and the radical intensities were much higher in rGO-APTMS-FMBO/CaO2 system. Both increased pH and reaction time led to the production of more CO2 center dot-, which activated the CaO2 to give more HO center dot to degrade SMX. Transformation products/intermediates of SMX were determined and potential mechanism and degradation pathway were proposed. The findings of this study provide new insights into the mechanism of heterogeneous catalysis based on CaO2 activated by rGO-APTMS-FMBO and the reactivity of this oxidation system toward environmental contaminants.

URI

https://hdl.handle.net/11511/89935

Journal

CHEMICAL ENGINEERING JOURNAL

DOI

https://doi.org/10.1016/j.cej.2019.123360

Collections

Department of Environmental Engineering, Article

Suggestions

OpenMETU
Core

Microstructural, biological and mechanical investigations of hydroxyapatite-β-tricalcium phosphate composites doped with strontium and fluoride Pourreza, Elmira; Evis, Zafer; Department of Engineering Sciences (2016) The aim of this study was to investigate the microstructure, mechanical and biological properties of biphasic hydroxyapatite--Tricalcium phosphate (HT) and HT substituted with constant fluoride (F−) and varying strontium (Sr2+) amounts. All the samples were synthesized via precipitation method and sintered at 1100°C for 1 h. It was observed that the relative density of the sintered strontium and fluoride doped HT slightly increased. For microstructural analysis, X-ray diffraction (XRD), scanning electron m...
Enantioselective reduction of ketones with borane catalyzed by cyclic β- amino alcohols prepared from proline Demir, Ayhan S; Mecitoglu, Idris; Tanyeli, Cihangir; Gülbeyaz, Volkan (Elsevier BV, 1996-12) New catalysts have been prepared from (S)- and (R)- proline and the asymmetric borane reduction of prochiral ketones using these catalysts has been studied. The secondary alcohols were obtained in 76-95% yield with 57-96% enantiomeric excesses. Copyright (C) 1996 Elsevier Science Ltd
Thermodynamics and Kinetics of Association of Antibiotics with the Aminoglycoside Acetyltransferase (3)-IIIb, a Resistance-Causing Enzyme Norris, Adrianne L.; Özen, Can; Serpersu, Engin H. (2010-05-18) The thermodynamic and kinetic properties of interactions of antibiotics with the aminoglycoside acetyltransferase (3)-IIIb (AAC) are determined with several experimental methods. These data represent the first such characterization of an enzyme that modifies the 2-deoxystreptamine ring common to all aminoglycoside antibiotics. Antibiotic substrates For AAC include kanamycin A, kanamycin B, tobramycin, sisomicin, neomycin B, paromomycin, lividomycin A, and ribostamycin. Kinetic studies show that kanamycin gr...
Modified acrylic hydrogels as controlled release systems Pınardağ, Fatma Esra; Hasırcı, Nesrin; Department of Chemistry (2006) In this study, pH-sensitive poly(acrylamide-co-acrylic acid) hydrogels were synthesized as controlled release systems in the presence of N,N-methylene bisacrylamide as crosslinker and ammonium persulfate as initiator. A set of hydrogels were used in the form they were prepared. One set of hydrogels were prepared as porous networks by incorporating sodium chloride into the reaction medium and then leaching of it after the completion of polymerization reaction. Two sets of hydrogels were modified by argon-pla...
Covalent immobilization of invertase on chemically activated poly(2-hydroxyethyl methacrylate) microbeads Altinok, H.; Aksoy, S.; Tumturk, H.; Hasırcı, Nesrin (2006-10-01) Properties of invertase immobilized on poly(2-hydroxyethyl methacrylate) microbeads activated by epichlorohydrin or cyanuric chloride were studied. After 20 repeated uses for 3 days, the activity of the immobilized enzyme was 92-93%.

Citation Formats

A. Amina, X. Si, K. Wu, Y. Si, and B. Yousaf, “Mechanistic insights into the reactive radicals-assisted degradation of sulfamethoxazole via calcium peroxide activation by manganese-incorporated iron oxide-graphene nanocomposite: Formation of radicals and degradation pathway,” CHEMICAL ENGINEERING JOURNAL, pp. 0–0, 2020, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/89935.