MgO/Co3O4 composite activated peroxymonosulfate for levofloxacin degradation: Role of surface hydroxyl and oxygen vacancies

Xue, Xiaojin; Liao, Weidong; Liu, Donglin; Zhang, Xiaodan; Huang, Yuming

doi:10.1016/j.seppur.2022.122560

Cited by 24 publications

(5 citation statements)

References 64 publications

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“…Then, demethylation finally produced degradation products with m/z = 188 [62]. The third pathway involved the removal of the N-methyl group from the piperazine ring of LEV generating a degradation product with m/z = 348, followed by the N oxidation of the piperazine ring to a hydroxylamine generating a degradation product with m/z = 364, and subsequently, the removal of hydroxyl generated a degradation product with m/z = 346, which was subsequently decarboxylated to generate a degradation product with m/z = 288 [63]. The fourth pathway involved the oxidative ring opening of the LEV piperazine ring to generate a bis-N-formyl LEV (m/z = 392), followed by the removal of the two formyl groups to generate a degradation product with m/z = 336, followed by the removal of the N-methyl group to generate a degradation product with m/z = 322, followed by the removal of methylamino group to generate a degradation product with m/z = 279, followed by the removal of the amino group and the removal of fluorine to generate a degradation product with m/z = 262 [64].…”

Section: Lev Degradation Products and Pathwaysmentioning

confidence: 99%

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

Hu,

Chen,

Guo

et al. 2024

Water

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The exploration of efficient, low-leaching, and recyclable transition-metal-based catalysts is of great importance for the removal of pollutants from peroxymonosulfate (PMS) in water purification processes. In this study, a bimetallic CoFe@CSC-700 composite was prepared by an alkaline gel pyrolysis reduction method using chitosan as a forming agent and applied to activate PMS to degrade levofloxacin (LEV). The leaching concentration of both cobalt and iron ions in the CoFe@CSC-700 catalyst was reduced by about 8-fold compared to the monometallic composite pellet catalyst. In addition, the removal efficiency of the CoFe@CSC-700 catalyst can still reach 90% after five cycles, showing good recyclability, recoverability and stability. Both free radical pathways (SO4·−, ·OH, and ·O2−) and non-free radical pathways (1O2) were detected in the oxidation reaction, with free radical pathways as the main contributor. The possible degradation pathways of LEV were proposed by LC-MS tests. Overall, this study provides new insights into the construction of efficient and stable PMS catalysts for wastewater treatment.

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Section: Lev Degradation Products and Pathwaysmentioning

confidence: 99%

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

Hu,

Chen,

Guo

et al. 2024

Water

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“…This includes single metal oxides, 57,105 bimetallic oxides, 60 and composite structures featuring transition metals. 106,107 OVs are prevalent in various materials for PS activation. These include perovskite structural materials, 3,45,108 metal compounds derived from MOFs, 48,91,109 layered double hydroxides, 49,50,55 biochar materials, 64,110 and other non-transition metal oxides.…”

Section: Anionic Vacancy Materialsmentioning

confidence: 99%

Emerging investigator series: recent progress on the activation of persulfate by vacancy defect materials: the role of vacancies

Tang,

Zhou,

et al. 2024

Environ. Sci.: Nano

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“…Therefore, the composite material increases the activation site, and some sites also have the adsorption capacity of OCs. This can shorten the ROS migration distance and improve the degradation rate. ,,− Bimetallic catalysts can also adjust the valence state of Co and maintain continuous activity of the catalyst. In this context, we will mainly introduce the improvement of bimetallic composites mainly composed of Fe, Cu, Mn, and Ce compounds on the performance activated PMS by Co-based catalysts.…”

Section: Theoretical Calculation Of Pms-aops Involving Cobalt-based H...mentioning

confidence: 99%

“…DFT calculations well reveal the complex effects of the surface structure of Co-based catalysts, such as crystal plane and vacancy. In addition, the surface −OH structure is an important active site. ,,,, Although experimental studies have suggested that easily formed Co–OH structures and surface −OH groups can effectively activate PMS, these aspects have not been systematically investigated in theoretical calculations. Exploring and simulating the complex Co-based catalyst surfaces comprehensively should be a direction for future research efforts.…”

Section: Summary and Outlookmentioning

confidence: 99%

Current Mechanism of Peroxymonosulfate Activation by Cobalt-Based Heterogeneous Catalysts in Degrading Organic Compounds

et al. 2023

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Persulfate based advanced oxidation processes (PS-AOPs) have been regarded as a mainstream degradation technology of organic compounds due to their high efficiency in wastewater treatment. In particular, peroxymonosulfate (PMS) has a unique structure and chemical properties, which can be efficiently activated by Co-based catalysts to produce active species with a high oxidation potential. These active species usually determine the subsequent degradation of organic compounds in an efficient process, while the intrinsic reaction mechanism behind this complex process remains unclear and therefore impedes the continual development in this scientific community. Recently, density functional theory (DFT) calculations have emerged as a powerful means to identify the electronic properties and distinguish energy changes in the PMS activation system. With the assistance of this quantum calculation, increasing investigations have been conducted focusing on explaining the phenomenon that occurred in experiments. However, these calculations mainly contributed in part to the reaction mechanism of PMS activation by Co-based catalysts and sometimes even differ from each other, lacking a comprehensive summary based on DFT calculation results. In this review, we introduce the main uses of DFT in the catalytic activation of PMS, provide recent application of calculation examples of Co-based heterogeneous catalysts with different structures, and then discuss the mechanism of PMS activation in detail. Finally, the research results of the DFT method in this field are summarized, and the future research focus and challenges are put forward, which is conducive to guiding the practical design of Co-based catalysts and further application of PS-AOPs in creating value products.

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MgO/Co3O4 composite activated peroxymonosulfate for levofloxacin degradation: Role of surface hydroxyl and oxygen vacancies

Cited by 24 publications

References 64 publications

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

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

Emerging investigator series: recent progress on the activation of persulfate by vacancy defect materials: the role of vacancies

Current Mechanism of Peroxymonosulfate Activation by Cobalt-Based Heterogeneous Catalysts in Degrading Organic Compounds

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