Reactive species in advanced oxidation processes: Formation, identification and reaction mechanism

Chemical Engineering Journal, Год журнала: 2020, Номер 401, С. 126158 - 126158

Опубликована: Июль 4, 2020

Язык: Английский

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Origins of Electron-Transfer Regime in Persulfate-Based Nonradical Oxidation Processes

Environmental Science & Technology, Год журнала: 2021, Номер 56(1), С. 78 - 97

Опубликована: Дек. 21, 2021

Persulfate-based nonradical oxidation processes (PS-NOPs) are appealing in wastewater purification due to their high efficiency and selectivity for removing trace organic contaminants complicated water matrices. In this review, we showcased the recent progresses of state-of-the-art strategies electron-transfer regimes PS-NOPs, including design metal metal-free heterogeneous catalysts, situ/operando characterization/analytical techniques, insights into origins mechanisms. a typical process (ETP), persulfate is activated by catalyst form surface complexes, which directly or indirectly interact with target pollutants finalize oxidation. We discussed different analytical techniques on fundamentals tactics accurate analysis ETP. Moreover, demonstrated challenges proposed future research ETP-based systems, such as computation-enabled molecular-level investigations, rational real-scenario applications environment. Overall, review dedicates sharpening understanding ETP PS-NOPs presenting promising remediation technology green chemistry.

Язык: Английский

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Edge-nitrogenated biochar for efficient peroxydisulfate activation: An electron transfer mechanism

Water Research, Год журнала: 2019, Номер 160, С. 405 - 414

Опубликована: Май 21, 2019

Язык: Английский

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Single-atom catalysis in advanced oxidation processes for environmental remediation

Chemical Society Reviews, Год журнала: 2021, Номер 50(8), С. 5281 - 5322

Опубликована: Янв. 1, 2021

This review presents the recent advances in synthetic strategies, characterisation, and computations of carbon-based single-atom catalysts, as well their innovative applications mechanisms advanced oxidation technologies.

Язык: Английский

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Nitrogen-doped biochar fiber with graphitization from Boehmeria nivea for promoted peroxymonosulfate activation and non-radical degradation pathways with enhancing electron transfer

Applied Catalysis B Environment and Energy, Год журнала: 2020, Номер 269, С. 118850 - 118850

Опубликована: Март 2, 2020

Язык: Английский

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Activation of Peroxydisulfate on Carbon Nanotubes: Electron-Transfer Mechanism

Environmental Science & Technology, Год журнала: 2019, Номер 53(24), С. 14595 - 14603

Опубликована: Ноя. 13, 2019

This study proposed an electrochemical technique for investigating the mechanism of nonradical oxidation organics with peroxydisulfate (PDS) activated by carbon nanotubes (CNT). The property twelve phenolic compounds (PCs) was evaluated their half-wave potentials, which were then correlated to kinetic rate constants in PDS/CNT system. Integrated quantitative structure-activity relationships (QSARs), electron paramagnetic resonance (EPR), and radical scavenging tests, nature pathways compound unveiled be electron-transfer regime other than a singlet oxygenation process. QSARs established according standard electrode activation energy, pre-exponential factor. A facile analysis method (chronopotentiometry combined chronoamperometry) also employed probe mechanism, suggesting that PDS catalyzed initially CNT form surface-confined -activated (CNT-PDS*) complex high redox potential. Then, CNT-PDS* selectively abstracted electrons from co-adsorbed PCs initiate oxidation. Finally, comparison graphite anodic under constant potentials comprehensively analyzed unveil relative activity toward different PCs, found dependent on oxidative adsorbed organics.

Язык: Английский

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Insights into the Electron-Transfer Regime of Peroxydisulfate Activation on Carbon Nanotubes: The Role of Oxygen Functional Groups

Environmental Science & Technology, Год журнала: 2019, Номер 54(2), С. 1267 - 1275

Опубликована: Дек. 17, 2019

Carbon-driven advanced oxidation processes are appealing in wastewater purification because of the metal-free feature carbocatalysts. However, regime emerging nonradical pathway is ambiguous intricate carbon structure. To this end, study was dedicated to unveil intrinsic structure-performance relationship peroxydisulfate (PDS) activation by nanotubes (CNTs) toward organics such as phenol (PE) via electron transfer. Eighteen analogical CNTs were synthesized and functionalized with different categories contents oxygen species. The quenching tests chronopotentiometry suggest that an improved reactivity surface-regulated attributed reinforced electron-transfer without generation free radicals singlet oxygen. quantitative structure–activity relationships established correlated Tafel equation, which unveils nature CNT-activated PDS complexes (CNT-PDS*). First, a decline concentration groups will make zeta potential CNT become less negative neutral solutions, facilitated adsorption weaker electrostatic repulsion. Then, metastable CNT-PDS* formed, elevated capacity CNT. Finally, PE would be oxidized over transfer fulfill redox cycle. Moreover, rate uncovered exponentially related complexes, suggesting undergoes mechanism analogous anodic oxidation.

Язык: Английский

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In-situ pyrolysis of Enteromorpha as carbocatalyst for catalytic removal of organic contaminants: Considering the intrinsic N/Fe in Enteromorpha and non-radical reaction

Applied Catalysis B Environment and Energy, Год журнала: 2019, Номер 250, С. 382 - 395

Опубликована: Март 20, 2019

Язык: Английский

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New Insights into the Generation of Singlet Oxygen in the Metal-Free Peroxymonosulfate Activation Process: Important Role of Electron-Deficient Carbon Atoms

Environmental Science & Technology, Год журнала: 2019, Номер 54(2), С. 1232 - 1241

Опубликована: Дек. 16, 2019

A nonradical oxidation process via metal-free peroxymonosulfate (PMS) activation has recently attracted considerable attention for organic pollutant degradation; however, the origin of singlet oxygen (1O2) generation still remains controversial. In this study, nitrogen-doped carbon nanosheets (NCN-900) derived from graphitic nitride were developed PMS and elucidation 1O2 production. With a large specific surface area (1218.7 m2 g–1) high nitrogen content (14.5 at %), NCN-900 exhibits superior catalytic activity in activation, as evidenced by complete degradation bisphenol within 2 min using 0.1 g L–1 mM PMS. Moreover, reaction rate constant fitted pseudo-first-order kinetics reaches an impressive value 3.1 min–1. Electron paramagnetic resonance measurements quenching tests verified primary reactive species NCN-900/PMS system. Based on X-ray photoelectron spectroscopy analysis theoretical calculations, unexpected pathway involving over electron-deficient atoms neighboring N was unraveled. Besides, system is also applicable remediation actual industrial wastewater. This work highlights important role furnishes support further relevant studies.

Язык: Английский

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Magnetic nitrogen-doped sludge-derived biochar catalysts for persulfate activation: Internal electron transfer mechanism

Chemical Engineering Journal, Год журнала: 2019, Номер 364, С. 146 - 159

Опубликована: Янв. 30, 2019

Язык: Английский

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