Degradation pathways of aniline in aqueous solutions during electro-oxidation with BDD electrodes and UV/H2O2 treatment

Benito, Aleix; Penadés, Aida; Lliberia, Josep Lluís; Gonzalez-Olmos, Rafael

doi:10.1016/j.chemosphere.2016.09.105

Cited by 116 publications

(32 citation statements)

References 42 publications

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“…Within this time, a yellow color was observed in the solution. However, this color disappeared for longer electrolysis times (>20 minutes), which is in agreement with the behavior of aniline polymerization on BDD and other electrodes reported in the literature …”

Section: Resultssupporting

confidence: 92%

Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

et al. 2019

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The sp3/sp2 ratio present in boron‐doped diamond (BDD) electrodes conditions the way in which organic compounds are oxidized and transformed to CO2 during anodic oxidation. A higher content of sp3 carbon on the surface favors the generation of hydroxyl radicals over the oxygen evolution reaction, which generates different degradation byproducts. In this work, we studied the degradation of aniline by anodic oxidation using five BDD electrodes with different sp3/sp2 ratios in sulfate and chloride media. Aniline was degraded using the five BDD electrodes in both electrolytes, and clear differences were observed in the intermediates produced during the electrolysis. BDD electrodes with higher sp3 proportions allowed for greater degradation and mineralization of aniline with lower molecular weight and the production of fewer toxic organic byproducts. Degradation pathways for aniline in sulfate and chloride media are proposed, evidencing the differences in the oxidation mechanisms for aniline and its byproducts due to the varying sp3/sp2 ratio in the BDD electrodes.

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Section: Resultssupporting

confidence: 92%

Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

et al. 2019

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“…In the removal of contamination from drinking water, there are three main targets that must be dealt with; organic molecules, inorganic metal ions and bacteria . Current strategies to degrade these species typically involve the use of stoichiometric reagents and/or the use of ultraviolet (UV) light . Eventhough effective, these methods are ill‐suited to many of the worst affected by water contamination, owing to the high cost associated with continually acquiring purification reagents or the need for energy intensive UV lamps.…”

Section: Introductionmentioning

confidence: 99%

Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

et al. 2017

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By using a simple thermal decomposition route, carbon‐TiO2 hybrid films have been synthesized from a catechol‐TiO2 surface complex. The coated films display enhanced visible region absorption, owing to the thin (≈2 nm) layer of carbon encapsulating the TiO2. Although photocatalytically active under visible light alone, it is demonstrated that the activity of the carbon‐coated films can be improved further by a hydrolytic treatment with TiCl4, leading to the introduction of small TiO2 particles (5–10 nm) and doping of chlorine into the structure. The combination of the carbon layer and TiCl4 treatment gives increased photocatalytic performance for the photodegradation of dyes, phenolic pollutants and the reduction of toxic CrVI to relatively benign CrIII. In addition, the carbon‐coated films show improved bactericidal activity under UV irradiation, and hence have been successfully tested against the most common types of pollutant present in potential drinking waters.

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“…Presently, increasing attention has been paid to the anodic oxidation for degrading the environmental pollutants. In this process pollutants can be oxidized by two principal mechanisms; direct electrochemical reaction via electron transfer between anode and molecule, and indirect oxidation via oxidants generated on the anode, called also mediated oxidation, in fact highly reactive and strongly oxidant heterogeneous hydroxyl radicals M( • OH) are produced on the anode surface (M) by electrochemical oxidation of water, according to reaction (1), using high O 2-overvoltage anodes such as boron-doped diamond (BDD) and PbO 2 [11][12][13][14]:…”

Section: Introductionmentioning

confidence: 99%

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Rabaaoui¹,

Kacem²,

Mohamed³

et al. 2017

Mod Chem Appl

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In this work, the removal of two pesticides 1, 2-dichlorobenzene and 1, 4-dichlorobenzene by electrolysis using BDD and Pb/PbO 2 as anodes is studied. Different operating conditions and factors affecting the treatment process including anode material, applied current density, supporting electrolyte and initial pH value were studied and optimized. Results demonstrate, as expected, that the influence of the anode material used on the degradation of pesticides was very significant in all cases. Infact electrolysis with diamond electrodes can attain the complete depletion of the pesticide and its mineralization faster than with PbO 2 anode. Electrolysis experiments strongly improves that the complete degradation of pesticides occurred in the presence of Na 2 SO 4 as conductive electrolyte at current density equals 20 mA cm -2 . Acidic pH would accelerate dichlorobenzene degradation, whereas alkaline condition showed negative effects. The disappearance of the pesticides followed a pseudo-first-order kinetics. Reversed-phase chromatography allows detecting Catechol, 2-chlorophenol and Pyrogallol as primary aromatic intermediates of 1,2-DCB and Hydroquinone, Benzoquinone and 4-chlorophenol for 1,4-DCB. Dechlorination of these products gives chloride ions Cl -. Ion-exclusion chromatography reveals the presence of maleic, formic, fumaric, malonic, glyoxylic, acetic and oxalic acid. An oxidation mechanism is proposed in agreement with other works shown in the literature.

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Degradation pathways of aniline in aqueous solutions during electro-oxidation with BDD electrodes and UV/H2O2 treatment

Cited by 116 publications

References 42 publications

Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

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Degradation pathways of aniline in aqueous solutions during electro-oxidation with BDD electrodes and UV/H2O2 treatment

Cited by 116 publications

References 42 publications

Effect of the sp3/sp2 Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

Effect of the sp3/sp2 Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

Improving Carbon‐Coated TiO2 Films with a TiCl4 Treatment for Photocatalytic Water Purification

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Contact Info

Product

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Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

Effect of the sp³/sp² Ratio in Boron‐Doped Diamond Electrodes on the Degradation Pathway of Aniline by Anodic Oxidation

Improving Carbon‐Coated TiO₂ Films with a TiCl₄ Treatment for Photocatalytic Water Purification