Optimizing electron spin resonance detection of hydroxyl radical in water

Cheng, Shaoan; Fung, Wai-Kit; Chan, Kwong‐Yu; Shen, Peng

doi:10.1016/s0045-6535(03)00369-2

Cited by 55 publications

(26 citation statements)

References 42 publications

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“…These processes are characterized by the transformation of a large number of organic pollutants into carbon dioxide, water and inorganic anions through the degradation reactions involving oxidative transitory species, mainly the hydroxyl radical (•OH). AOP have been used to electrochemically produce hydroxyl radicals in an anodic reaction directly from water 12 . These hydroxyl radicals strongly react with all organic substances usually by hydrogen abstraction 12 .…”

Section: Introductionmentioning

confidence: 99%

“…AOP have been used to electrochemically produce hydroxyl radicals in an anodic reaction directly from water 12 . These hydroxyl radicals strongly react with all organic substances usually by hydrogen abstraction 12 . In addition to its environmental compatibility, the electrochemical process presents important advantages related to its versatility, high energy efficiency, amenability of automation, and safety because it operates at mild conditions [13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

“…In basic medium the RO16 dye presents in deprotonated form (Figure 6). This form is more susceptible to azo bond break and as consequence, the color removal is more efficient 12,13 . Furthermore, the discoloring ability of this method depends on the amount of the hydroxyl radical (main oxidizing agent) generated on the anode surface.…”

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confidence: 99%

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Influence of Supporting Electrolytes on RO 16 Dye Electrochemical Oxidation Using Boron Doped Diamond Electrodes

et al. 2017

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The influence of different supporting electrolytes as well as of different current densities on RO16 dye electrochemical oxidation using BDD electrodes has been systematically studied. The RO16 azo-dye electrooxidation experiments were performed at different current densities and three different supporting electrolytes:The results showed that a higher degradation for reactive azo dye RO16 was observed for the K 2 SO 4 (pH=10) supporting electrolyte for a current density of 100 mA cm -2 . This behavior can be associated with the deprotonation effect of the dye molecule, which can facilitate breakdown of the molecule, specifically the azo bond making color removal more efficient. In addition, in this pH there is a greater amount of hydroxyl ion (OH -) available increasing the hydroxyl radical formation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Supporting Electrolytes on RO 16 Dye Electrochemical Oxidation Using Boron Doped Diamond Electrodes

et al. 2017

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“…These processes are characterized by the transformation of a large number of organic pollutants into carbon dioxide, water and inorganic anions through the degradation reactions involving oxidative transitory species, mainly the hydroxyl radical (•OH). AOP has been demonstrated to produce hydroxyl radicals electrochemically in an anodic reaction directly from the water (13) . These hydroxyl radicals react strongly with all organic substances usually by hydrogen abstraction.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a promising technology to degrade the persistent azo-dye (RO16) using boron doped diamond electrodes

Migliorini¹,

Alegre²,

Alves³

et al. 2014

RBAV

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The electrochemical degradation of the reactive orange 16 azo-dye (RO16) using boron doped diamond (BDD) electrodes grown on titanium substrate (BDD/Ti) is presented. Two different electrodes, produced at growth times of 7 and 24 h, were used and named as E1 and E2, respectively. Both of them are highly doped, with the acceptor concentration of around 7.0 x 10 20 cm -3 , evaluated by the Raman spectra. The morphological and the physical characterization confirmed the best diamond purity of E2 electrode associated with its largest and well faceted grains as well as with its lowest sp 2 content. This behavior was attributed to the diamond columnar growth dominance after the stead state process, observed for the films with a thickness higher than 3.0 mm. The electrode efficiencies were studied to degrade electrochemically the RO16 dye. The results were analyzed by UV/VIS spectroscopy, by total organic carbon (TOC) and by high-performance liquid chromatography (HPLC) techniques. The electrode E2 showed the best efficiency for both, the aromaticity reduction and the azo group fracture, from UV/VIS spectra. These tendencies were confirmed by the TOC and the chromatographic measurements. The direct relationships among the BDD morphology, physical property, and performance during the degradation process were discussed.Keywords: Electrochemical oxidation; Reactive orange 16 dye; Boron doped diamond. Resumo É apresentada neste trabalho a degradação eletroquímica do corante Reativo alaranjado 16 (RO16) utilizando eletrodos de diamante dopado com boro sobre substrato de titânio (BDD/Ti). Dois eletrodos diferentes, produzidos com tempo de crescimento de 7 e 24 h, foram utilizados e denominados como

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“…A number of methods have been developed for the determination of •OH levels. These methods include electron spin resonance (ESR) with spin trapping agents [2,3], high-performance liquid chromatography (HPLC) analysis of products formed by a reaction with •OH [1,4], luminol chemiluminescence [5][6][7][8], and colorimetry using suitable color-producing reagents [9,10].…”

Section: Introductionmentioning

confidence: 99%

Oxygen electrode as a new tool to evaluate hydroxyl radical-scavenging ability

Komagoe

Takeuchi

Katsu

2008

Sensors and Actuators B: Chemical

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An oxygen electrode was applied to determine hydroxyl radical (•OH) levels for the first time. The method is based on the determination of •OH generated by the Fenton reaction using the reaction of •OH with a scavenger and the resulting radical consuming an oxygen molecule stoichiometrically.Thus, the•OH-scavenging abilities of antioxidant reagents, as well as the concentration of•OH, can be determined by the measurement of consumption of dissolved oxygen using an oxygen electrode. A good correlation between the present method and conventional colorimetry was obtained for the estimation of the •OH-scavenging activities of antioxidants. Furthermore, the results correlated with the•OH-scavenging rate constants of the reagents evaluated by a "cupric ion reducing antioxidant capacity (CUPRAC)" assay. We applied the present method to estimate the •OH-scavenging abilities of commercially available alcoholic drinks.

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Optimizing electron spin resonance detection of hydroxyl radical in water

Cited by 55 publications

References 42 publications

Influence of Supporting Electrolytes on RO 16 Dye Electrochemical Oxidation Using Boron Doped Diamond Electrodes

Influence of Supporting Electrolytes on RO 16 Dye Electrochemical Oxidation Using Boron Doped Diamond Electrodes

Optimization of a promising technology to degrade the persistent azo-dye (RO16) using boron doped diamond electrodes

Oxygen electrode as a new tool to evaluate hydroxyl radical-scavenging ability

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