Sustained molecular oxygen activation by solid iron doped silicon carbide under microwave irradiation: Mechanism and application to norfloxacin degradation

Li, Hongbo; Chen, Jing; Hou, Huijie; Pan, Hong; Ma, Xiumei; Yang, Jiakuan; Wang, Linling; Crittenden, John C.

doi:10.1016/j.watres.2017.09.001

Cited by 66 publications

(9 citation statements)

References 51 publications

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“…In order to discriminate the types of reactive species, such as holes (h + ), superoxide radicals (•O 2 − ) and hydroxyl radicals (•OH), and their contribution to the MW‐driven catalytic oxidation for NOR, radical trapping experiments were employed through varying their corresponding scavengers (see Figure S3, Supporting Information) . It can be clearly observed that the injection of triethanolamine (TEOA) (h + scavenger, 1 × 10 −3 m ) exert an obviously inhibitory effect on NOR degradation, implying that MW‐driven h + may be the predominant active species participated in this process.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Liu

Wang

et al. 2018

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The search for earth‐abundant, low‐cost, recyclable, multifunctional as well as highly active catalysts remains the most pressing demand for heterogeneous catalytic elimination of pollutants in water environment remediation. Herein, a porous graphitic carbon‐encapsulated Ni nanoparticles (NPs) hybrid (Ni@GC) is designed/constructed by direct pyrolysis of a Ni‐based metal−organic framework (MOF) in N2. The resulting Ni@GC exhibits a unique 3D hierarchical byttneria aspera‐like yolk–shell structure with a high surface area, abundant active sites as well as good microwave (MW)‐absorbing performance. The outstanding MW‐driven oxidation of norfloxacin to inorganic molecules and direct catalytic reduction of 4‐nitrophenol to less toxic and more useful chemical raw material (4‐aminophenol) can originate from the synergistic effects, including the presence of both zero‐valent Ni NPs as the active center and graphitic carbon as the protective layer/electron acceptor as well as unique porous yolk‐void‐shell structure, which facilitates the MW energy‐harvesting and/or rapid mass transfer of the reactant/product in the channels and cavities. Accordingly, the localized surface plasmon resonance–excitation and electronic relay mechanism are proposed to account for the catalytic oxidation/reduction, respectively. This work provides a new strategy for the design/assembly of multifunctional metal@GC hybrids with a unique architecture and elucidates new opportunities for remediation of environmental water.

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Section: Resultsmentioning

confidence: 99%

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Liu

Wang

et al. 2018

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“…⋅and OH ⋅ (2.60 V and 2.80 V) were higher than those of the activation energies of hydroxylation on the piperazinyl ring, furthermore, the defluorination and hydroxylation reactions on the quinolone group of NOR (1.55-2.35 eV) [65]. SO 4 ⋅tended to attack the electron-rich sites via electron transfer, and OH ⋅ was selective for hydrogen abstraction or addition reaction [66].…”

Section: Journal Of Nanomaterialsmentioning

confidence: 88%

Degradation of Norfloxacin in an Aqueous Solution by the Nanoscale Zero-Valent Iron-Activated Persulfate Process

Zhang

Zhao

Yang

et al. 2020

Journal of Nanomaterials

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In this study, nanoscale zero-valent iron (nZVI) was synthesized and used to activate persulfate (PS) for the degradation of norfloxacin (NOR). The nZVI/PS system exhibited a high reactivity towards NOR, and the degradation efficiency of NOR (100 mg/L) reached 93.8% with 0.1 g/L nZVI, 12 mM PS, and an initial pH of 7.0 within 7 min. The NOR degradation followed a pseudo-first-order kinetic model, and the effects of parameters such as nZVI dosage, PS concentration, initial pH, and temperature were investigated systematically. Overloading of nZVI lowered the degradation efficiency owing to the quenching effect of excessive Fe2+. The higher PS concentration and temperature favored the degradation of NOR. The influence of pH was not obvious, and the degradation was effective in a wide pH range. In addition, the radical quenching experiments and electron paramagnetic resonance (EPR) indicated that both sulfate radical (SO4⋅-) and hydroxyl radical (OH⋅) were the dominant radicals in the degradation process, in which the latter played a more important role. Finally, three degradation pathways were proposed based on the result of intermediates identified by liquid chromatography-mass spectrometry. Overall, this study indicated that the nZVI/PS system could provide a promising alternative for NOR wastewater treatment.

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“…531 A similar SiC-supported mixed-oxide catalyst supported on the SiC foam (CoFe 2 O 4 −SiC) was proposed by Mao and co-workers as an effective and rapid degradation system for the fixed-bed treatment water flows contaminated with malachite green (MG) a silk, leather, and paper dye with a relatively high degree of toxicity. 532 Chen and Wang reported on the improved degradation efficiency of Norfloxacin (NOR)−a common antibiotic present in wastewater effluents from the aquaculture industry and livestock− 533 and oxidation of As 3+ to arsenate 534 the less thermal conductive and less MW-responsive Attapulgite (ATP), 535 a hydrous magnesium−aluminum silicate clay. Shen and co-workers have finally made use of a similar Cu/SiC catalyst under MW-assisted heating for the phenol degradation using either H 2 O 2 and Na 2 S 2 O 8 as the ROS source for the degradation process, 536 showing for the persulfate a markedly higher production of free radicals and thus a higher pollutant degradation efficiency.…”

Section: Catalytic Applicationsmentioning

confidence: 99%

“…A similar SiC-supported mixed-oxide catalyst supported on the SiC foam (CoFe 2 O 4 –SiC) was proposed by Mao and co-workers as an effective and rapid degradation system for the fixed-bed treatment water flows contaminated with malachite green (MG) a silk, leather, and paper dye with a relatively high degree of toxicity . Chen and Wang reported on the improved degradation efficiency of Norfloxacin (NOR)–a common antibiotic present in wastewater effluents from the aquaculture industry and livestock– and oxidation of As 3+ to arsenate (As 5+ ) by a MW-heated/activated Fe/SiC catalyst. They have also demonstrated the improved degradation efficiency of p -nitrophenol (PNP) by a SiC-supported Cu catalyst compared to a Cu catalyst supported on the less thermal conductive and less MW-responsive Attapulgite (ATP), a hydrous magnesium–aluminum silicate clay.…”

Section: Catalytic Applicationsmentioning

confidence: 99%

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

et al. 2021

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There is an obvious gap between efforts dedicated to the control of chemicophysical and morphological properties of catalyst active phases and the attention paid to the search of new materials to be employed as functional carriers in the upgrading of heterogeneous catalysts. Economic constraints and common habits in preparing heterogeneous catalysts have narrowed the selection of active-phase carriers to a handful of materials: oxide-based ceramics (e.g. Al2O3, SiO2, TiO2, and aluminosilicates–zeolites) and carbon. However, these carriers occasionally face chemicophysical constraints that limit their application in catalysis. For instance, oxides are easily corroded by acids or bases, and carbon is not resistant to oxidation. Therefore, these carriers cannot be recycled. Moreover, the poor thermal conductivity of metal oxide carriers often translates into permanent alterations of the catalyst active sites (i.e. metal active-phase sintering) that compromise the catalyst performance and its lifetime on run. Therefore, the development of new carriers for the design and synthesis of advanced functional catalytic materials and processes is an urgent priority for the heterogeneous catalysis of the future. Silicon carbide (SiC) is a non-oxide semiconductor with unique chemicophysical properties that make it highly attractive in several branches of catalysis. Accordingly, the past decade has witnessed a large increase of reports dedicated to the design of SiC-based catalysts, also in light of a steadily growing portfolio of porous SiC materials covering a wide range of well-controlled pore structure and surface properties. This review article provides a comprehensive overview on the synthesis and use of macro/mesoporous SiC materials in catalysis, stressing their unique features for the design of efficient, cost-effective, and easy to scale-up heterogeneous catalysts, outlining their success where other and more classical oxide-based supports failed. All applications of SiC in catalysis will be reviewed from the perspective of a given chemical reaction, highlighting all improvements rising from the use of SiC in terms of activity, selectivity, and process sustainability. We feel that the experienced viewpoint of SiC-based catalyst producers and end users (these authors) and their critical presentation of a comprehensive overview on the applications of SiC in catalysis will help the readership to create its own opinion on the central role of SiC for the future of heterogeneous catalysis.

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Sustained molecular oxygen activation by solid iron doped silicon carbide under microwave irradiation: Mechanism and application to norfloxacin degradation

Cited by 66 publications

References 51 publications

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Fabrication of 3D Hierarchical Byttneria Aspera‐Like Ni@Graphitic Carbon Yolk–Shell Microspheres as Bifunctional Catalysts for Ultraefficient Oxidation/Reduction of Organic Contaminants

Degradation of Norfloxacin in an Aqueous Solution by the Nanoscale Zero-Valent Iron-Activated Persulfate Process

Porous Silicon Carbide (SiC): A Chance for Improving Catalysts or Just Another Active-Phase Carrier?

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