Advanced oxidative degradation of acetaminophen by carbon catalysts: Radical vs non-radical pathways

Pham, Van Luan; Kim, Do-Gun; Ko, Seok‐Oh

doi:10.1016/j.envres.2020.109767

Cited by 42 publications

(21 citation statements)

References 43 publications

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“…Through a non-radical pathway, PMS (as an electron acceptor) formed an active complex on the OTC surface (as an electron intermediate bridge) with the sp 2 -metal ion network, Lewis basic group (C=O), and the binding site on the OTC. Subsequently, the OTC was degraded directly by the reactive complex through an abstract electron process [60]. The possible degradation process of OTC was displayed in Fig.…”

Section: Analysis Of Degradation Intermediates and Possible Mechanismmentioning

confidence: 99%

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

Wang

et al. 2022

Environ Sci Pollut Res

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Co-doped magnetic Mn 3 O 4 was synthesized by the solvothermal method and adopted as an effective catalyst for the degradation of oxytetracycline (OTC) in water.Synergistic interactions between Co-Mn 3 O 4 and Fe 3 O 4 not only resulted in the enhanced catalytic activity through the activation of peroxymonosulfate (PMS) to degrade OTC, but also made Fe 3 O 4 /Co-Mn 3 O 4 easy to be separated and recovered from aqueous solution. 94.2% of OTC could be degraded within 60 min at an initial OTC concentration of 10 mg/L, catalyst dosage of 0.2 g/L and PMS concentration of 10 mM, the high efficiency of which was achieved in a wider pH range of 3.0-10.0.The free radical quenching experiments showed that O 2•radicals and 1 O 2 played the main role in the degradation process. Co 3+ , Co 2+ , Fe 2+ , Fe 3+ , Mn 4+ , Mn 3+ and Mn 2+ on Fe 3 O 4 /Co-Mn 3 O 4 were identified as catalytic sites based on XPS analysis. Eventually, the intermediates of OTC degradation were examined and the possible decomposition pathways were proposed. The excellent catalytic performance of Fe 3 O 4 /Co-Mn 3 O 4 not 2 only came from the fact that the large specific surface area could provide abundant active sites for the activation of PMS, but also the charged redistribution among atoms to accelerate the reduction of metal ions. The high degradation efficiency of OTC in actual water samples indicated that Fe 3 O 4 /Co-Mn 3 O 4 had good potential for practical application.

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Section: Analysis Of Degradation Intermediates and Possible Mechanismmentioning

confidence: 99%

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

Wang

et al. 2022

Environ Sci Pollut Res

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“…58 Fig. 4 Different mechanisms between AC and BC for the PS catalytic degradation of sulfamethoxazole ((a) with permission from Elsevier), 53 PS activation on representative GAC ((b) with permission from Elsevier), 54 and elongated bond distance of O-OH of PAA on AC fibers ((c) with permission from Elsevier). 37 2.1.2.…”

Section: Aops Owing To Their Unique Advantages Compared With Metalbas...mentioning

confidence: 99%

“…Both SO 4 ˙ − and ˙OH were deemed to be the contributing species based on the EPR results. Likewise, Pham et al 54 used GAC for acetaminophen degradation by activating PS (Fig. 4b).…”

Section: Metal-free Catalystsmentioning

confidence: 99%

Recent advances in metal-free catalysts for the remediation of antibiotics, antibiotic resistant bacteria (ARB), and antibiotic resistant genes (ARGs)

Wang

Ding

et al. 2022

J. Mater. Chem. A

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“…In our system, the increase of AC concentration leads to an increase in the degradation percentage, this might refer to the increase in the number of functional groups that are capable of activating PS. [20] However, excessive addition of catalyst may increase the radical's formation, which leads to radical self-scavenging, also, low oxidation radicals may form, resulting in a decrease in the degradation efficiency. The degradation of ACT was conducted under different AC concentrations 1.65, 3.3, and 8.25 mM.…”

Section: The Effect Of Ac Concentrations On Degradation Efficiencymentioning

confidence: 99%

“…The mechanism behind the degradation of ACT via AC, the functional groups that existed on the AC surface were responsible for the activation of PS and formation of SO � À 4 , [20] then sulfate radicals attack water and hydroxyl molecules lead to the formation of hydroxyl radicals as equations ( 8) and ( 9), then active radicals attack ACT molecules as equations 10) and 11). With non-radical pathways, PS (as an electron acceptor) bonded with the sp 2 -hybridized carbon network, the Lewis basic groups (C¼O), and the defect sites on the AC to create active complexes on the surface of the AC (as an electron mediator bridge).…”

Section: The Degradation Mechanism Of Act By Ac/ps Systemmentioning

confidence: 99%

Heterogeneous Activation of Persulfate by Activated Carbon for Efficient Acetaminophen Degradation: Mechanism, Kinetics, Mineralization, and Density Functional Theory

2022

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Pharmaceutical compounds attracted environmentalists according to their unknown impact on the ecosystem and the increase in their demand. Acetaminophen (ACT) or paracetamol has been detected more than the natural concentration value. To avoid the negative impact of the ACT accumulation into the environment, many treatment techniques have been applied. Among them, advanced oxidation process (AOP) techniques have shown high efficiency to remove ACT. In this study, the ability of AC to catalyze PS by its functional group was evaluated, and the degradation efficiency of ACT was determined by using an activated carbon (AC)/persulfate (PS) system. In addition, the mechanism, kinetics, mineralization, and the density functional theory were also investigated. HPLC was used to measure ACT concentration, and the optimum results in this work were 100 % degradation within 3 minutes at catalysts concentrations AC 8.25 mM/PS 1.65 mM at pH 7 and the mineralization were 24 % after 90 min of reaction. And the degradation pathway of ACT was built based on density functional theory. This study will contribute to clarifying the role of carbon catalysts in the PS oxidation of pollutants. The degradation of ACT by using an AC/PS system is recommended because of the high degradations efficiency, non-toxic byproducts, and environmentally friendly.

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Advanced oxidative degradation of acetaminophen by carbon catalysts: Radical vs non-radical pathways

Cited by 42 publications

References 43 publications

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

Peroxymonosulfate activation by Co-doped magnetic Mn3O4 for degradation of oxytetracycline in water

Recent advances in metal-free catalysts for the remediation of antibiotics, antibiotic resistant bacteria (ARB), and antibiotic resistant genes (ARGs)

Heterogeneous Activation of Persulfate by Activated Carbon for Efficient Acetaminophen Degradation: Mechanism, Kinetics, Mineralization, and Density Functional Theory

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