High-efficiency electro-Fenton process based on in-situ grown CoFeCe-LDH@CFs free-standing cathodes: Correlation of cerium and oxygen vacancies with H2O2

Xu, Minghan; Wei, Jia; Cui, Xueru; Li, Jiamei; Pan, Guoping; Li, Yanan; Jiang, Zijian; Niu, Xiruo; Cui, Nan; Li, Jun

doi:10.1016/j.cej.2022.140922

Cited by 34 publications

(5 citation statements)

References 43 publications

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“…Besides, SV-pyrite exhibited a moderate adsorption of *OOH, leading to a reduced energy barrier for H 2 O 2 formation (Figure c). This finding aligned with previous studies, which suggested that anion vacancies with abundant unpaired electrons aid in the reduction of O 2 and enhance H 2 O 2 yield …”

Section: Resultssupporting

confidence: 93%

“…This finding aligned with previous studies, which suggested that anion vacancies with abundant unpaired electrons aid in the reduction of O 2 and enhance H 2 O 2 yield. 61 To further analyze the dissociation of H 2 O 2 , the produced 1 O 2 was detected by EPR. The intensity of the TEMP-adduct was higher in the case of pyrite by ball milling (Figure 4d).…”

Section: −E Cbmentioning

confidence: 99%

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Sulfur Vacancies in Pyrite Trigger the Path to Nonradical Singlet Oxygen and Spontaneous Sulfamethoxazole Degradation: Unveiling the Hidden Potential in Sediments

Zhu,

Wang,

Sun

et al. 2024

Environ. Sci. Technol.

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Pharmaceutical residues in sediments are concerning as ubiquitous emerging contaminants. Pyrite is the most abundant sulfide minerals in the estuarine and coastal sediments, making it a major sink for pharmaceutical pollutants such as sulfamethoxazole (SMX). However, research on the adsorption and redox behaviors of SMX on the pyrite surface is limited. Here, we investigated the impact of the nonphotochemical process of pyrite on the fate of coexisting SMX. Remarkably, sulfur vacancies (SVs) on pyrite promoted the generation of nonradical species (hydrogen peroxide, H 2 O 2 and singlet oxygen, 1 O 2 ), thereby exhibiting prominent SMX degradation performance under darkness. Nonradical 1 O 2 contributed approximately 73.1% of the total SMX degradation. The SVs with high surrounding electron density showed an advanced affinity for adsorbing O 2 and then initiated redox reactions in the sediment electron-storing geobattery pyrite, resulting in the extensive generation of H 2 O 2 through a two-electron oxygen reduction pathway. Surface Fe(III) (hydro)oxides on pyrite facilitated the decomposition of H 2 O 2 to 1 O 2 generation. Distinct nonradical products were observed in all investigated estuarine and coastal samples with the concentrations of H 2 O 2 ranging from 1.96 to 2.94 μM, while the concentrations of 1 O 2 ranged from 4.63 × 10 −15 to 8.93 × 10 −15 M. This dark-redox pathway outperformed traditional photochemical routes for pollutant degradation, broadening the possibilities for nonradical species use in estuarine and coastal sediments. Our study highlighted the SV-triggered process as a ubiquitous yet previously overlooked source of nonradical species, which offered fresh insights into geochemical processes and the dynamics of pollutants in regions of frequent redox oscillations and sulfur-rich sediments.

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Section: Resultssupporting

confidence: 93%

Section: −E Cbmentioning

confidence: 99%

Sulfur Vacancies in Pyrite Trigger the Path to Nonradical Singlet Oxygen and Spontaneous Sulfamethoxazole Degradation: Unveiling the Hidden Potential in Sediments

Zhu,

Wang,

Sun

et al. 2024

Environ. Sci. Technol.

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“…45 The peak at about 531 eV in the survey XPS spectrum may be attributed to the oxidation on the sample surface and the introduction of physically adsorbed O and chemically adsorbed O species. 46 The high-resolution XPS spectrum of N 1S can be deconvoluted into five peaks of 398.1, 398.9, 400.2, 401.1 and 403.6 eV, corresponding to pyridine N, Co coordinating nitrogen (Co-N), pyrrole N, graphite N and nitrogen oxide, respectively. 40,[47][48][49] The elemental content of all samples obtained by XPS is summarized in Table S2 (ESI †), and the data showed that the nitrogen doping content of Ce-Co/N/C samples increased to 11.1%, obviously higher than that of Co/N/C catalysts (6.36%).…”

Section: Resultsmentioning

confidence: 99%

High-dispersion Co/N/C ultra-thin carbon nanosheets modified with trace Ce as efficient oxygen reduction reaction catalysts

Zhu

Xie

et al. 2023

New J. Chem.

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“…[74] Metal oxides, metal chlorides, layered double hydroxides, and heteroatom-doped carbon materials have been reported as carriers to disperse metal atoms. [118][119][120] Among them, N-doped carbon is considered particularly promising for the synthesis of DMSCs due to the excellent coordination properties of N atoms with metal atoms as mentioned in Section 2.3 and the widely studied carbon carriers with natural channels and defects, large specific area, low cost, and abundant raw materials. [43] This section mainly summarizes methods and influencing factors of synthesizing DMSCs in terms of different carbon materials (Table 2).…”

Section: Synthesis Of Dmscs Based On Carbon Carriersmentioning

confidence: 99%

Recent Advance of Atomically Dispersed Dual‐Metal Sites Carbocatalysts: Properties, Synthetic Materials, Catalytic Mechanisms, and Applications in Persulfate‐Based Advanced Oxidation Process

Wei

Cui

et al. 2023

Adv Funct Materials

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Recently, atomically dispersed dual‐metal sites carbocatalysts (DMSCs) make a wave in the field of persulfate‐based advanced oxidation processes (PS‐AOPs) in light of their ≈100% atomic utilization efficiency, high density of active sites, and superior catalytic activity. This review aims to provide a state‐of‐the‐art overview on the development of DMSCs for activating PS. Initially, the types and properties of DMSCs are summarized, as well as the role of doping different heteroatoms is discussed. Subsequently, the properties of different carbon carriers and the methods for the synthesis of DMSCs are outlined. After that, the mechanism and application of DMSCs for the activation of PS toward organic contaminants degradation are revealed. Particularly, the mechanism of nonradical pathway is described, and the necessity of coupling DMSCs‐based PS‐AOPs to other processes for practical water treatment is emphasized. Finally, the formidable challenges and future research directions of DMSCs are proposed. This review is expected to provide insight into the preparation of DMSCs in the field of nanomaterials and to broaden the path for their environmental applications.

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High-efficiency electro-Fenton process based on in-situ grown CoFeCe-LDH@CFs free-standing cathodes: Correlation of cerium and oxygen vacancies with H2O2

Cited by 34 publications

References 43 publications

Sulfur Vacancies in Pyrite Trigger the Path to Nonradical Singlet Oxygen and Spontaneous Sulfamethoxazole Degradation: Unveiling the Hidden Potential in Sediments

Sulfur Vacancies in Pyrite Trigger the Path to Nonradical Singlet Oxygen and Spontaneous Sulfamethoxazole Degradation: Unveiling the Hidden Potential in Sediments

High-dispersion Co/N/C ultra-thin carbon nanosheets modified with trace Ce as efficient oxygen reduction reaction catalysts

Recent Advance of Atomically Dispersed Dual‐Metal Sites Carbocatalysts: Properties, Synthetic Materials, Catalytic Mechanisms, and Applications in Persulfate‐Based Advanced Oxidation Process

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