Transformation of gemfibrozil by the interaction of chloride with sulfate radicals: Radical chemistry, transient intermediates and pathways

Chen, Chunyan; Wu, Zihao; Hou, Senlin; Fang, Jingyun

doi:10.1016/j.watres.2021.117944

Cited by 34 publications

(7 citation statements)

References 64 publications

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“…The CQP degradation efficiency rose to14.4 and 19.00% in the presence of Cl – at the two respective concentrations. This was also consistent with previous studies, indicating that this radical pathway was dominant for toxic organic pollutant degradation …”

Section: Resultssupporting

confidence: 93%

“…Two common anions existing in aquatic systems, Cl – and HCO 3 – , were chosen to examine the catalytic performance of the SPBC-700N/PMS system for CQP degradation, with potential interferences related to water systems, since anions would like to consume SO 4 •– and • OH and form radicals with lower redox potentials . The CQP removal rate was only 10.07 and 9.92% with the addition of 20 and 50 mM HCO 3 – , respectively (Figure c).…”

Section: Resultsmentioning

confidence: 99%

“…•− and • OH and form radicals with lower redox potentials. 10 The CQP removal rate was only 10.07 and 9.92% with the addition of 20 and 50 mM HCO 3 − , respectively (Figure 3c). The CQP degradation efficiency rose to14.4 and 19.00% in the presence of Cl − at the two respective concentrations.…”

Section: Characterization and Stabilization Mechanismmentioning

confidence: 97%

“…This was also consistent with previous studies, indicating that this radical pathway was dominant for toxic organic pollutant degradation. 10 To evaluate the stable and reusable performance of SPBC-700N, catalytic reactions were repeated at least three times under optimal conditions. The catalyst was collected via centrifugation and washed with methanol and deionized water after each run.…”

Section: Characterization and Stabilization Mechanismmentioning

confidence: 99%

“…Recently, sulfate radical (SO 4 •– )-based advanced oxidation processes (AOPs) have gained popularity for the degradation of organic contaminants in ground water and soil. , A large number of studies have reported that the hydroxyl radical ( • OH) and SO 4 • – can be generated from the activation of peroxymonosulfate (PMS) and persulfate (PS) by transition metal catalysts, including V 3+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , and Mn 2+ . , However, the leaching of hazardous transition metal ions in AOPs has become a crucial challenge to be overcome, and the proper stabilization of the transition metals in catalysts has become critical.…”

Section: Introductionmentioning

confidence: 99%

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Facile Pyrolysis Treatment for the Synthesis of Single-Atom Mn Catalysts Derived from a Hyperaccumulator

et al. 2023

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Advanced oxidation processes (AOPs) have revealed wide prospects in the application of the degradation of organic contaminants in ground water and soil. High-performance, environmentally friendly, and low-cost single-atom catalysts (SACs) are promising approaches to active persulfate in AOPs. However, the practical application of SACs is restricted by high preparation costs and tedious procedures. Herein, a manganese (Mn) hyperaccumulator, Phytolacca americana, was successfully exploited as a precursor to synthesize a novel Mn SAC (SPBC-700N) via a one-step pyrolysis method. In SPBC-700N, Mn atoms are dispersed atomically upon the carbon matrix and coordinate with four N atoms to form Mn–N4 active sites, which exhibits an extraordinary catalytic activity for peroxymonosulfate (PMS) activation. A large number of reactive oxygen species are formed during the reaction, and over 90% of the antibiotic (chloroquine phosphate/CQP) could be removed within 30 min. The superior catalytic performance of the Mn SAC/PMS system for CQP degradation is ascribed to the synergistic effect of the maximized utilization of Mn atoms and the neighboring pyrrolic N sites, as identified by X-ray absorption fine structure spectroscopy and density function theory calculations. This work not only provides a green and low-cost strategy for synthesizing SACs but also gives an atomic-level insight into the catalytic activity of the Mn–N4 sites for PMS activation.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Characterization and Stabilization Mechanismmentioning

confidence: 97%

Section: Characterization and Stabilization Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Facile Pyrolysis Treatment for the Synthesis of Single-Atom Mn Catalysts Derived from a Hyperaccumulator

et al. 2023

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Discriminating the Active Ru Species Towards the Selective Generation of Singlet Oxygen from Peroxymonosulfate: Nanoparticles Surpass Single‐Atom Catalysts

Bi,

Ding,

Song

et al. 2024

Angewandte Chemie

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Singlet oxygen (1O2) is an exceptional reactive oxygen species in advanced oxidation processes for environmental remediation. Despite single‐atom catalysts (SACs) representing the promising candidate for the selective generation of 1O2 from peroxymonosulfate (PMS), the necessity to meticulously regulate the coordination environment of metal centers poses a significant challenge in the precisely‐controlled synthetic method. Another dilemma to SACs is their high surface free energy, which results in an inherent tendency for the surface migration and aggregation of metal atoms. We here for the first time reported that Ru nanoparticles (NPs) synthesized by the facile pyrolysis method behave as robust Fenton‐like catalysts, outperforming Ru SACs, towards efficient activation of PMS to produce 1O2 with nearly 100% selectivity, remarkably improving the degradation efficiency for target pollutants. Density functional theory calculations have unveiled that the boosted PMS activation can be attributed to two aspects: (i) enhanced adsorption of PMS molecules onto Ru NPs, and (ii) decreased energy barriers by offering adjacent sites for promoted dimerization of *O intermediates into adsorbed 1O2. This study deepens the current understanding of PMS chemistry, and sheds light on the design and optimization of Fenton‐like catalysts.

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Discriminating the Active Ru Species Towards the Selective Generation of Singlet Oxygen from Peroxymonosulfate: Nanoparticles Surpass Single‐Atom Catalysts

Bi,

Ding,

Song

et al. 2024

Angew Chem Int Ed

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Transformation of gemfibrozil by the interaction of chloride with sulfate radicals: Radical chemistry, transient intermediates and pathways

Cited by 34 publications

References 64 publications

Facile Pyrolysis Treatment for the Synthesis of Single-Atom Mn Catalysts Derived from a Hyperaccumulator

Facile Pyrolysis Treatment for the Synthesis of Single-Atom Mn Catalysts Derived from a Hyperaccumulator

Discriminating the Active Ru Species Towards the Selective Generation of Singlet Oxygen from Peroxymonosulfate: Nanoparticles Surpass Single‐Atom Catalysts

Discriminating the Active Ru Species Towards the Selective Generation of Singlet Oxygen from Peroxymonosulfate: Nanoparticles Surpass Single‐Atom Catalysts

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