Electric field-enhanced coupled with metal-free peroxymonosulfate activactor: The selective oxidation of nonradical species-dominated system

Yu, Chao; Zhao, Zhenyu; Zong, Yang; Xu, Longqian; Zhang, Bing; Wu, Deli

doi:10.1016/j.watres.2022.119323

Cited by 29 publications

(3 citation statements)

References 53 publications

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“…Moreover, the reactivity of 1 O 2 with many organic contaminants have actually been fairly established in aquatic photochemistry, , especially for (substituted) phenols and phenolates. , 1 O 2 has been proved to be not the major oxidant during the photodegradation of sulfamethoxazole (SMX) since the rate constant of SMX with 1 O 2 is far too low to result any meaningful decomposition within an acceptable timescale [ k (SMX+1O2) = 2.0 × 10 4 M –1 s –1 ] Nevertheless, many recent AOP studies claimed that 1 O 2 could efficiently degrade SMX or other organic contaminants [e.g., carbamazepine (CBZ)] − that have been reported to be recalcitrant to 1 O 2 attack . Moreover, 1 O 2 was even proposed to be able to mineralize organics (e.g., 4-chlorophenol) to CO 2 and H 2 O in a peroxymonosulfate-based AOP with 100% selectivity in generating 1 O 2 , but 1 O 2 is known to be too substrate-dependent to result in organic mineralization .…”

Section: Introductionmentioning

confidence: 99%

Do We Appropriately Detect and Understand Singlet Oxygen Possibly Generated in Advanced Oxidation Processes by Electron Paramagnetic Resonance Spectroscopy?

Zong

Chen

Zeng

et al. 2023

Environ. Sci. Technol.

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Electron paramagnetic resonance (EPR) spectroscopy using sterically hindered amine is extensively applied to detect singlet oxygen (1O2) possibly generated in advanced oxidation processes. However, EPR-detectable 1O2 signals were observed in not only the 1O2-dominated hydrogen peroxide (H2O2)/hypochlorite (NaClO) reaction but surprisingly also the 1O2-absent Fe(II)/H2O2, UV/H2O2, and ferrate [Fe(VI)] process with even stronger intensities. By taking advantage of the characteristic reaction between 1O2 and 9,10-diphenyl-anthracene and near-infrared phosphorescent emission of 1O2, 1O2 was excluded in the Fe(II)/H2O2, UV/H2O2, and Fe(VI) process. The false detection of 1O2 was ascribed to the direct oxidation of hindered amine to piperidyl radical by reactive species [e.g., •OH and Fe(VI)/Fe(V)/Fe(IV)] via hydrogen transfer, followed by molecular oxygen addition (forming a piperidylperoxyl radical) and back reaction with piperidyl radical to generate a nitroxide radical, as evidenced by the successful identification of a piperidyl radical intermediate at 100 K and theoretical calculations. Moreover, compared to the highly oxidative species (e.g., •OH and high-valence Fe), the much lower reactivity of 1O2 and the profound nonradiative relaxation of 1O2 in H2O resulted it too selective and inefficient in organic contaminant destruction. This study demonstrated that EPR-based 1O2 detection could be remarkably misled by common oxidative species and thereby jeopardize the understandings on 1O2.

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Section: Introductionmentioning

confidence: 99%

Do We Appropriately Detect and Understand Singlet Oxygen Possibly Generated in Advanced Oxidation Processes by Electron Paramagnetic Resonance Spectroscopy?

Zong

Chen

Zeng

et al. 2023

Environ. Sci. Technol.

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“…As displayed in Fig. 3d, when DMPO served as the spin-trapping agent towards SO 4 ˙−/˙OH and O 2 ˙−, 29 tiny and indistinct characteristics of DMPO-SO 4 ˙− or DMPO-˙OH adducts appeared, which was the same with the signal of the DMPO-O 2 − adduct. This result also manifests their minimal contribution to the degradation of TC.…”

Section: Identification Of Rosmentioning

confidence: 59%

Insights into the mechanism of persulfate activation by hollow MOF-derived carbon: electron transfer-triggered non-radical oxidization for antibiotic removal

Peng,

Xiong,

Yang

et al. 2024

Environ. Sci.: Nano

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“…However, such radical-based AOPs are less effective in degrading certain persistent organic pollutants (POPs) like the highly toxic halogenated phenols. The oxidation potential of 1 O 2 is relatively mild ( E 0 = 1.4–2.2 V), but it tends to attack the electron-rich organic compound [ 29 , 30 ]. Therefore, taking into account the degradation characteristics of ROS in AOP as well as the structural properties of specific molecules to design catalysts is expected to be effective in improving the advanced oxidative degradation of POPs.…”

Section: Introductionmentioning

confidence: 99%

Design of Environmental-Friendly Carbon-Based Catalysts for Efficient Advanced Oxidation Processes

Xu,

Kuang,

Jiang

et al. 2024

Materials

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Advanced oxidation processes (AOPs) represent one of the most promising strategies to generate highly reactive species to deal with organic dye-contaminated water. However, developing green and cost-effective catalysts is still a long-term goal for the wide practical application of AOPs. Herein, we demonstrated doping cobalt in porous carbon to efficiently catalyze the oxidation of the typically persistent organic pollutant rhodamine B, via multiple reactive species through the activation of peroxymonosulfate (PMS). The catalysts were prepared by facile pyrolysis of nanocomposites with a core of cobalt-loaded silica and a shell of phenolic resin (Co-C/SiO2). It showed that the produced 1O2 could effectively attack the electron-rich functional groups in rhodamine B, promoting its molecular chain breakage and accelerating its oxidative degradation reaction with reactive oxygen-containing radicals. The optimized Co-C/SiO2 catalyst exhibits impressive catalytic performance, with a degradation rate of rhodamine B up to 96.7% in 14 min and a reaction rate constant (k) as high as 0.2271 min−1, which suggested promising potential for its practical application.

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Electric field-enhanced coupled with metal-free peroxymonosulfate activactor: The selective oxidation of nonradical species-dominated system

Cited by 29 publications

References 53 publications

Do We Appropriately Detect and Understand Singlet Oxygen Possibly Generated in Advanced Oxidation Processes by Electron Paramagnetic Resonance Spectroscopy?

Do We Appropriately Detect and Understand Singlet Oxygen Possibly Generated in Advanced Oxidation Processes by Electron Paramagnetic Resonance Spectroscopy?

Insights into the mechanism of persulfate activation by hollow MOF-derived carbon: electron transfer-triggered non-radical oxidization for antibiotic removal

Design of Environmental-Friendly Carbon-Based Catalysts for Efficient Advanced Oxidation Processes

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