Stability of 5,5-dimethyl-1-pyrroline-N-oxide as a spin-trap for quantification of hydroxyl radicals in processes based on Fenton reaction

Fontmorin, Jean-Marie; Burgos-Castillo, Rutely C.; Tang, Walter Z.; Sillanpää, Mika

doi:10.1016/j.watres.2016.04.053

Cited by 254 publications

(121 citation statements)

References 29 publications

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“…The sextuplet signal is consistent with ac arbon-centered radicala nd corresponds to the DMPO/4-NO 2 -C 6 H 4 C radical adduct (a N = 14.3 G, a H = 20.9 G). The graduald isappearance of the sextuplet and the increasei nt he intensity of the triplet signal suggests possible quenching or degradation of the spin-adduct (DMPO/4-NO 2 -C 6 H 4 ·), indicating ar adicals pecie of open ring with g = 2.0056 and a N = 13.9 G. [17] In the absence of ascorbic acid (Figure 2B), the same set of signals is observed, but the sextuplet appears in al ower intensity, thus confirming that ascorbic acidi nduces the formation of the 4-NO 2 -C 6 H 4 C aryl radical. Given that DMSO is as ource of methyl radicals, we also examined the EPR spectrumo fasolution containing only ascorbic acid and DMPO (see the Supporting Information, Figure S6).…”

Section: Resultsmentioning

confidence: 96%

Ascorbic Acid as an Aryl Radical Inducer in the Gold‐Mediated Arylation of Indoles with Aryldiazonium Chlorides

Medina‐Mercado

Asomoza‐Solís

Martínez‐González

et al. 2019

Chemistry A European J

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In recent years interestint he development of protocols that facilitate the oxidativea ddition of gold to access mild cross-coupling processes mediated by this metal hasincreased. In this context, we report herein that ascorbic acid, an atural and readily accessible antioxidant, can be used to accelerate the oxidative addition of aryldiazonium chlorides onto Au I .T he aryl-Au III speciesg enerated in this way,h as been used to prepare 3-arylindoles in ao ne-pot protocol startingf rom anilines and para-, meta-, and ortho-s ubstituted aryldiazonium chlorides. The mechanism underlying the oxidative addition has been examined in detail based on EPR analyses, cyclic voltammetry,a nd DFT calculations. Interestingly, we have found that in this protocol, the chloride atom induces the Au II /Au III oxidation step.

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Section: Resultsmentioning

confidence: 96%

Ascorbic Acid as an Aryl Radical Inducer in the Gold‐Mediated Arylation of Indoles with Aryldiazonium Chlorides

Medina‐Mercado

Asomoza‐Solís

Martínez‐González

et al. 2019

Chemistry A European J

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“…In addition, a triplet with hyperfine splitting constants a N = 1.453 mT was also observed during the process. This triplet could be assigned to a paramagnetic dimer, which resulted from the further oxidizing of DMPO-OH adducts [61]. The triplet's intensity increased along with the decrease of DMPOX heptet and its peak amplitude reached to maximum after 5 min.…”

Section: Omentioning

confidence: 93%

Heterogeneous degradation of refractory pollutants by peroxymonosulfate activated by CoOx-doped ordered mesoporous carbon

Wang

Cao

Zhao

2017

Chemical Engineering Journal

292

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h i g h l i g h t sCo-OMC catalyst possesses high specific surface area and uniform pore size. /g) and uniform pore size distribution ($4 nm) because of its ordered mesoporous structure. 20 mg/L phenol could be completely degraded with the addition of 0.1 g/L Co-OMC and 1 mM PMS in 60 min. In addition, the catalytic activity of Co-OMC for PMS activation was much higher than some efficient catalysts such as Co 3 O 4 , CoFe 2 O 4 and OMC. Besides, Co-OMC showed remarkable efficiency for the destruction of seven representative pollutants. Results indicated that the catalytic activity of Co-OMC increased with the calcination temperature increasing, which may be caused by the higher defect degree at higher calcination temperature. In addition, various practical parameters such as PMS concentration, initial pH, anion, nature organic matter and reaction temperature were systematically investigated using phenol as the target pollutant.

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“…This technique has been employed for simultaneous wastewater treatment and energy recovery. [1][2][3] The main advantage of Fenton reactions is the involvement of ferrous iron and hydrogen peroxide, [4][5][6][7][8][9][10][11][12][13] and this has been proven to be effective over other conventional wastewater treatment methods. 14 Although the BEF system is very simple, the high cost of hydrogen peroxide and the undesirable recycling of ferrous iron are the major drawbacks for large-scale application in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Innovative multi‐processed N‐doped carbon and Fe ₃ O ₄ cathode for enhanced bioelectro‐Fenton microbial fuel cell performance

Yan

Chiang

et al. 2019

Int J Energy Res

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Summary A novel bioelectro‐Fenton microbial fuel cell (BEF‐MFC) cathode has been fabricated by modification of electrode using multi‐processing of nitrogen‐doped carbon (NDC)/nano‐Fe3O4 method with the aims of cost‐effectiveness, high oxygen reduction reaction (ORR) efficiency, and power performance enhancement. In this study, BEF‐MFC with carbon cloth (CC) cathode pyrolyzed with NDC‐M100/Fe3O4 at 700°C achieved higher ORR activity compared with the commercial Pt/C under same operational conditions. It also exhibited excellent crystalline structure according to high‐resolution transmission electron microscope (HRTEM) analysis. Moreover, using NDCN/Fe3O4 can facilitate further Fenton‐like reaction for the treatment of wastewater. Chemical oxygen demand (COD) removal efficiency of the reactor was 78% with maximum power density of 1.57 W/m3 in 216 hours. Thus, an innovative multi‐processing method with feasibility for enhanced wastewater treatment and improved power performance of the MFC was investigated. This can be effectively applied in related alternative energy production techniques and bio‐electrochemical systems in the future.

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Stability of 5,5-dimethyl-1-pyrroline-N-oxide as a spin-trap for quantification of hydroxyl radicals in processes based on Fenton reaction

Cited by 254 publications

References 29 publications

Ascorbic Acid as an Aryl Radical Inducer in the Gold‐Mediated Arylation of Indoles with Aryldiazonium Chlorides

Ascorbic Acid as an Aryl Radical Inducer in the Gold‐Mediated Arylation of Indoles with Aryldiazonium Chlorides

Heterogeneous degradation of refractory pollutants by peroxymonosulfate activated by CoOx-doped ordered mesoporous carbon

Innovative multi‐processed N‐doped carbon and Fe ₃ O ₄ cathode for enhanced bioelectro‐Fenton microbial fuel cell performance

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Stability of 5,5-dimethyl-1-pyrroline-N-oxide as a spin-trap for quantification of hydroxyl radicals in processes based on Fenton reaction

Cited by 254 publications

References 29 publications

Ascorbic Acid as an Aryl Radical Inducer in the Gold‐Mediated Arylation of Indoles with Aryldiazonium Chlorides

Ascorbic Acid as an Aryl Radical Inducer in the Gold‐Mediated Arylation of Indoles with Aryldiazonium Chlorides

Heterogeneous degradation of refractory pollutants by peroxymonosulfate activated by CoOx-doped ordered mesoporous carbon

Innovative multi‐processed N‐doped carbon and Fe 3 O 4 cathode for enhanced bioelectro‐Fenton microbial fuel cell performance

Contact Info

Product

Resources

About

Innovative multi‐processed N‐doped carbon and Fe ₃ O ₄ cathode for enhanced bioelectro‐Fenton microbial fuel cell performance