Contribution of cathodic hydroxyl radical generation to the enhancement of electro-oxidation process for water decontamination

Medel, Alejandro; Treviño‐Reséndez, José; Brillas, Enric; Meas, Y.; Sirés, Ignasi

doi:10.1016/j.electacta.2019.135382

Cited by 43 publications

(19 citation statements)

References 65 publications

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“…Its deprotonated form, O .− , is less reactive and it is only present at alkaline pH‐levels (pK a =11.9) [1a,4–5] . The reactivity of the hydroxyl radicals include H⋅ abstraction, electron transfer, and electrophilic addition to π systems [4,7a,23a] . It degrades organic pollutants [26] and could potentially damage the PS in this PEC system.…”

Section: Resultsmentioning

confidence: 99%

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The Role of Singlet Oxygen, Superoxide, Hydroxide, and Hydrogen Peroxide in the Photoelectrochemical Response of Phenols at a Supported Highly Fluorinated Zinc Phthalocyanine

et al. 2022

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Photoelectrochemical (PEC) sensing of phenolic compounds using singlet oxygen (1O2)‐generating photocatalysts has emerged as a powerful detection tool. However, it is currently not known how experimental parameters, such as pH and applied potential, influence the generation of reactive oxygen species (ROS) and their photocurrents. In this article, the PEC response was studied over the 6 to 10 pH range using a rotating (ring) disk (R(R)DE) set‐up in combination with quenchers, to identify the ROS formed upon illumination of a supported photosensitizer, F64PcZn. The photocurrents magnitude depended on the applied potential and the pH of the buffer solution. The anodic responses were caused by the oxidation of O2.−, generated due to the quenching of 1O2 with −OH and the reaction of 3O2 with [F64Pc(3‐)Zn]. The cathodic responses were assigned to the reduction of 1O2 and O2.−, yielding H2O2. These insights may benefit 1O2 – based PEC sensing applications.

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Section: Resultsmentioning

confidence: 99%

“…However, as the local concentration of produced ⋅OH is high, it can dimerize to form H 2 O 2 (eq. 12) [7a,23a] and thus the concentration of ⋅OH may be diminished.

true 2^{•} OH \to normalH_{2} normalO_{2}

…”

Section: Resultsmentioning

confidence: 99%

The Role of Singlet Oxygen, Superoxide, Hydroxide, and Hydrogen Peroxide in the Photoelectrochemical Response of Phenols at a Supported Highly Fluorinated Zinc Phthalocyanine

et al. 2022

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“…The cathodic material's overpotential affects the evolution of H 2 and the production of alternative products. 30 Besides, years ago, platinum electrode was found to be possibly used as anode and cathode based on the electrode combination in the research work carried out by Yazici et al 31 The abovementioned cathodic intervention opens a new window concerning the effect of the cathodic material on the EO process performance and WAS disintegration phenomena. The cathodic production of oxidizing agents occurs mainly through the reduction of O 2 to H 2 O 2 that was noticed mainly in metallic and carbonaceous materials.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the cathodic composition is strictly related to the production of H 2 O 2 and plays an important role in the selectivity of the cathodic materials. 30 The number of publications that investigate the role of the cathodic materials in the EO process is limited. Deeper studies are, therefore, needed for a better understanding of the process.…”

Section: Introductionmentioning

confidence: 99%

Highlighting the cathodic contribution of an electrooxidation pretreatment study on waste activated sludge disintegration

Erkan

Turan

Engin

2021

Env Prog and Sustain Energy

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In this study, the effect of the cathodic contribution in the performance of electrooxidation (EO) pretreatment of waste activated sludge (WAS) was investigated using different electrode pairs, namely titanium dioxide (TiO 2 )/TiO 2 , TiO 2 /TiO 2 coated Platine (Pt) and TiO 2 /TiO 2 coated ruthenium dioxide (RuO 2 ) and main operational parameters such as dosage of electrolyte solution (Na 2 SO 4 ), initial pH, applied current, and electrolysis time were optimized. Disintegration degree (DD) in terms of soluble chemical oxygen demand (CODs) increased with an increase in initial pH of WAS, applied current, and electrolysis time for all pairs of electrodes. Under the optimized conditions (5 g/L Na 2 SO 4 , pH 10, 3 A of current, and 100 min of e time), a maximum DD value of 23.93 and 14.26% was obtained using TiO 2 /RuO 2 and Pt/TiO 2 electrodes, respectively. However, lower DD COD value of 12.85% was obtained for TiO 2 /TiO 2 electrodes at similar conditions except for 4 A current. Soluble extracellular polymeric substances analysis and their protein and polysaccharide concentrations confirmed the disintegration of WAS flocs by the EO process. The operational cost (OC) of applied processes was also calculated and OC values were found in the following order: TiO 2 /RuO 2 (46.54 €/m 3 ) > TiO 2 /TiO 2 (41.77 €/m 3 ) > TiO 2 /Pt (32.99.54 €/m 3 ) from the point of energy consumption.

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“…The hydroxyl radical (cOH), an unstable and highly reactive molecule, has aroused growing attention in the past decades. It has been widely used in many areas of human health, including drinking water treatment, [1][2][3] air quality monitoring, 4 cancer treatment, 5 etc. Normal levels of cOH in cells play critical roles in regulating many physiological and pathological events.…”

Section: Introductionmentioning

confidence: 99%

A sensitive BODIPY-based fluorescent probe for detecting endogenous hydroxyl radicals in living cells

Bian

Chen

et al. 2020

RSC Adv.

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Contribution of cathodic hydroxyl radical generation to the enhancement of electro-oxidation process for water decontamination

Cited by 43 publications

References 65 publications

The Role of Singlet Oxygen, Superoxide, Hydroxide, and Hydrogen Peroxide in the Photoelectrochemical Response of Phenols at a Supported Highly Fluorinated Zinc Phthalocyanine

The Role of Singlet Oxygen, Superoxide, Hydroxide, and Hydrogen Peroxide in the Photoelectrochemical Response of Phenols at a Supported Highly Fluorinated Zinc Phthalocyanine

Highlighting the cathodic contribution of an electrooxidation pretreatment study on waste activated sludge disintegration

A sensitive BODIPY-based fluorescent probe for detecting endogenous hydroxyl radicals in living cells

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