Enhanced degradation of chloramphenicol at alkaline conditions by S(-II) assisted heterogeneous Fenton-like reactions using pyrite

Zhao, Lijie; Chen, Yufan; Liu, Yanxia; Luo, Cong; Wu, Deli

doi:10.1016/j.chemosphere.2017.09.019

Cited by 102 publications

(16 citation statements)

References 58 publications

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“…In this study, the degradation reaction of ciprofloxacin was dramatically suppressed when methanol (40 mmol/L) was added in the systems catalyzed by FeS/Fe3O4 and FeS/Fe3O4@BC500, according to the results shown in Figure 6a. The results confirm that • OH is the reactive species that has made the major contribution for the oxidation of ciprofloxacin, which is consistent with previous reports about the Fenton-type reactions catalyzed by iron minerals [27,29,31,32,39,47,48]. For further investigating the role of biochar, the cumulative production of • OH in the two Fenton-type systems was measured using benzoic acid (BA) as the probe.…”

Section: Investigation About the Reactive Speciessupporting

confidence: 89%

Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin

et al. 2019

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The Fenton-type oxidation catalyzed by iron minerals is a cost-efficient and environment-friendly technology for the degradation of organic pollutants in water, but their catalytic activity needs to be enhanced. In this work, a novel biochar-supported composite containing both iron sulfide and iron oxide was prepared, and used for catalytic degradation of the antibiotic ciprofloxacin through Fenton-type reactions. Dispersion of FeS/Fe 3 O 4 nanoparticles was observed with scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). Formation of ferrous sulfide (FeS) and magnetite (Fe 3 O 4 ) in the composite was validated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Ciprofloxacin (initial concentration = 20 mg/L) was completely degraded within 45 min in the system catalyzed by this biochar-supported magnetic composite at a dosage of 1.0 g/L. Hydroxyl radicals (·OH) were proved to be the major reactive species contributing to the degradation reaction. The biochar increased the production of ·OH, but decreased the consumption of H 2 O 2 , and helped transform Fe 3+ into Fe 2+ , according to the comparison studies using the unsupported FeS/Fe 3 O 4 as the catalyst. All the three biochars prepared by pyrolysis at different temperatures (400, 500 and 600 • C) were capable for enhancing the reactivity of the iron compound catalyst.

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Section: Investigation About the Reactive Speciessupporting

confidence: 89%

Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin

et al. 2019

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“…Many multiphase/homogeneous catalysts have been used in place of the traditional Fe 2+ , such as Fe 3+ , Cu 2+ /Cu + , pyrite, and nano‐zero valent iron. . Vasudevan et al.…”

Section: Introductionsupporting

confidence: 60%

Study on Catalytic Performance of rGH/Fe‐g‐C₃N₄ Photocatalysis‐Fenton Synergy System[1]

Jia

Wang

2019

ChemistrySelect

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Graphene and Fe‐g‐C3N4 were combined to form a three‐dimensional catalytic gel material with visible light response. The graphene gel enabled the rapid recovery of the catalyst and improved cycling performance. In this work, the co‐degradation efficiency of the rGH/Fe‐g‐C3N4 photocatalytic‐Fenton system was investigated using phenol to simulate organic pollutants. A phenol concentration of 20±0.1 mg L−1 could be completely degraded by the 10% rGH/Fe‐g‐C3N4 after 50 min, and the photocurrent was 5.1 times and 1.8 times larger than that of g‐C3N4 and Fe‐g‐C3N4, respectively. In this system, the reaction of photogenerated electrons with Fe3+ promotes the rapid transfer of photogenerated charges. Additionally, Fe2+ participates in the Fenton reaction to rapidly form ⋅OH to promote cycling of the Fe valence state. Moreover, the π‐π conjugated graphene accelerates the transfer of electrons and results in the direct reduction of H2O2 to form ⋅OH. Furthermore, compared with the powder Fe‐g‐C3N4 catalyst, 10% rGH/Fe‐g‐C3N4 showed excellent recoverability and cyclability. After seven cycles, the degradation efficiency reached >86±1%. Finally, a degradation experiment with coking wastewater was carried out under optimized conditions. After 60 min, the COD and TOC values decreased from 67.8±1 mg L−1 and 21.6±0.2 mg L−1, to 21.6±1 mg L−1 and 6.7±0.2 mg L−1, respectively.

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“…We recently discovered that MoS 2 could serve as an effective cocatalyst to greatly promote the degradation efficiency of Fe 2+ -catalyzed AOPs by enhancing the Fe 3+ /Fe 2+ recycling rate with the Mo 6+ /Mo 4+ sites on the edge of the MoS 2 nanosheets (eqs and ) Although a series of follow-up studies have verified the positive role of metal sulfides in the Fenton reaction, − some urgent issues still need to be addressed to further promote the wide adoption of the catalysts for practical applications. First, as only the Mo 6+ /Mo 4+ sites on the edge of the nanosheet are involved in the degradation reaction, most sites on the flat surface are not used, limiting the utilization efficiency of the cocatalyst.…”

Section: Introductionmentioning

confidence: 99%

MoS₂/FeS Nanocomposite Catalyst for Efficient Fenton Reaction

Yang

Wang

Aleisa

et al. 2021

ACS Appl. Mater. Interfaces

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Nanocomposites containing FeS as catalyst and MoS2 as cocatalyst have been synthesized toward efficient heterogeneous Fenton reaction. The deposition of FeS nanoparticles in situ on the surface of MoS2 nanosheets creates strong contact between the two components and generates a large number of exposed Mo6+ sites and sulfur vacancies, which contribute to the enhanced degradation rate by accelerating Fe3+/Fe2+ cycling and ensuring rapid electron transfer. In addition, the MoS2/FeS nanocomposite catalysts exhibit the best performance at near-neutral conditions (pH 6.5), which solves the challenges in conventional Fenton reactions such as leaching of metal ions, the formation of iron slurry, and the need of adjusting solution pH. Further, the nanocomposite can maintain high efficiency after many recycling experiments. It is believed that the MoS2/FeS nanocomposite represents an efficient heterogeneous Fenton catalyst that can greatly promote the performance of advanced oxidation processes (AOPs) for solving practical environmental issues.

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Enhanced degradation of chloramphenicol at alkaline conditions by S(-II) assisted heterogeneous Fenton-like reactions using pyrite

Cited by 102 publications

References 58 publications

Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin

Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin

Study on Catalytic Performance of rGH/Fe‐g‐C₃N₄ Photocatalysis‐Fenton Synergy System[1]

MoS₂/FeS Nanocomposite Catalyst for Efficient Fenton Reaction

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Enhanced degradation of chloramphenicol at alkaline conditions by S(-II) assisted heterogeneous Fenton-like reactions using pyrite

Cited by 102 publications

References 58 publications

Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin

Biochar-Supported FeS/Fe3O4 Composite for Catalyzed Fenton-Type Degradation of Ciprofloxacin

Study on Catalytic Performance of rGH/Fe‐g‐C3N4 Photocatalysis‐Fenton Synergy System[1]

MoS2/FeS Nanocomposite Catalyst for Efficient Fenton Reaction

Contact Info

Product

Resources

About

Study on Catalytic Performance of rGH/Fe‐g‐C₃N₄ Photocatalysis‐Fenton Synergy System[1]

MoS₂/FeS Nanocomposite Catalyst for Efficient Fenton Reaction