Anodic oxidation of 2-naphthol at boron-doped diamond electrodes

Panizza, Marco; Michaud, Pierre; Cerisola, G.; Comninellis, Ch.

doi:10.1016/s0022-0728(01)00398-9

Cited by 475 publications

(337 citation statements)

References 22 publications

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“…In recent years, electrochemical oxidation with conductive-diamond anodes has become one of the most promising technologies in the treatment of industrial wastes polluted with organics [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] and in the electrosynthesis of inorganic oxidants [13,[33][34][35]. Compared with other electrode materials, conductive-diamond has shown higher chemical and electrochemical stability as well as a higher current efficiency.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

et al. 2007

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID : 3043 Abstract A new method for the synthesis of peroxomonophosphate, based on the use of boron-doped diamond electrodes, is described. The amount of oxidant electrogenerated depends on the characteristics of the supporting media (pH and solute concentration) and on the operating conditions (temperature and current density). Results show that the pH, between values of 1 and 5, does not influence either the electrosynthesis of peroxomonophosphate or the chemical stability of the oxidant generated. Conversely, low temperatures are required during the electrosynthesis process to minimize the thermal decomposition of peroxomonophosphate and to guarantee significant oxidant concentration. In addition, a marked influence of both the current density and the initial substrate is observed. This observation can be explained in terms of the contribution of hydroxyl radicals in the oxidation mechanisms that occur on diamond surfaces. In the assays carried out below the water oxidation potential, the generation of hydroxyl radicals did not take place. In these cases, peroxomonophosphate generation occurs through a direct electron transfer and, therefore, at these low current densities lower concentrations are obtained. On the other hand, at higher potentials both direct and hydroxyl radical-mediated mechanisms contribute to the oxidant generation and the process is more efficient. In the same way, the contribution of hydroxyl radicals may also help to explain the significant influence of the substrate concentration. Thus, the coexistence of both phosphate and hydroxyl radicals is required to ensure the generation of significant amounts of peroxomonophosphoric acid.

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Section: Introductionmentioning

confidence: 99%

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

et al. 2007

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“…The pollutant degradation may be subjected to current control or mass transfer control. Initially, the AO II concentration was relatively high, and accordingly the AO II reduction rate was subjected to the current control (24). As the AO II concentration was lowered to a certain level, the AO II reduction rate was subjected to the mass transfer control.…”

Section: Resultsmentioning

confidence: 99%

Design of BDD-TiO₂ Hybrid Electrode with P−N Function for Photoelectrocatalytic Degradation of Organic Contaminants

Zhao

2008

Environ. Sci. Technol.

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P-N hybrid electrode of boron-doped diamond (BDD) and TiO 2 were designed and fabricated via selective deposition of TiO 2 onto BDD electrode. This hybrid electrode exhibit high photoelectrocatalytic activities toward degradation of acid orange II (AOII) and 2, 4-dichloropheonl (2, 4-DCP) due to the P-N effect and high electrocatalytic and photocatalytic activities of BDD electrode and TiO 2 particles. The structures of TiO 2 and BDD were confirmed by Raman spectra analysis. Atom force microscopy and scanning electron microscopy showed that the TiO 2 deposits consist of adherent nanomicro-sized particles, scattered on the BDD substrate. AOII and 2,4-DCP in a solution can be efficiently degraded at the hybrid electrode in the photoelectrocatalysis (PEC) process. Effect of applied bias potentials and solution pH values on AOII and 2,4-DCP degradation were investigated. In the electro-oxidation process, some intermediates such as phenols were detected and they accumulated with the reaction evolution based on the analysis of UV-vis and GC-MS variation. By contrast, phenols intermediates will be degraded with the reaction evolution in the photoelectrocatalysis process. And, organic aromatic and aliphatic carboxylic acids were detected. Furthermore, different degradation mechanism of AOII and 2,4-DCP in the electro-oxidation, photocatalysis, and photoelectrocatalysis is proposed.

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“…Panizza et al [40] developed a simple mathematical model that only considered direct and/or hydroxyl radical mediated oxidation of organic contaminants.…”

Section: Theorymentioning

confidence: 99%

Remediation of wastewaters containing tetrahydrofuran. Study of the electrochemical mineralization on BDD electrodes

Urtiaga

Fernández-Castro

Gómez

et al. 2014

Chemical Engineering Journal

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This work contributes to the development of electro-oxidation on commercial boron doped diamond (BDD) anodes as an efficient and versatile environmental technology to deal with remediation of tetrahydrofuran (THF) polluted industrial wastewaters.Working with an undivided flow-by electrochemical cell, a systematic experimental study has been carried out to analyze the influence of the following operation variables: i) initial THF concentrations in the range 500-1100 mg/L ii) supporting electrolyte, Na 2 SO 4 and NaCl and iii) current density in the range 300-1200 A/m 2 . The performance of the oxidation process was assessed through the change in the concentration of THF, chemical oxygen demand (COD), and total organic carbon (TOC) being the current density the variable that exerted the most positive kinetic influence; more precisely the reduction of COD after 60 minutes changed from 40 % at j app = 300 A/m 2 to 95.5 % at j app =1200 A/m 2 , whereas the reductions of TOC were typically higher than 95 % for a value of the specific charge of Q=10 A/hL. Besides, THF oxidation products have been analyzed, and the reactions' pathway are proposed.Finally, the formation of chloride by-products, such as perchlorate was assessed observing that it was hindered at low current densities. In the view of these findings, it is concluded that THF oxidation on BDD anodes should be better performed at low current densities, i.e. 300 A/m 2 for the type of wastewaters analyzed in the present work, to reach a compromise between effective degradation and the formation of undesirable chlorinated by-products.

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Anodic oxidation of 2-naphthol at boron-doped diamond electrodes

Cited by 475 publications

References 22 publications

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Design of BDD-TiO₂ Hybrid Electrode with P−N Function for Photoelectrocatalytic Degradation of Organic Contaminants

Remediation of wastewaters containing tetrahydrofuran. Study of the electrochemical mineralization on BDD electrodes

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Anodic oxidation of 2-naphthol at boron-doped diamond electrodes

Cited by 475 publications

References 22 publications

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes

Design of BDD-TiO2 Hybrid Electrode with P−N Function for Photoelectrocatalytic Degradation of Organic Contaminants

Remediation of wastewaters containing tetrahydrofuran. Study of the electrochemical mineralization on BDD electrodes

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Design of BDD-TiO₂ Hybrid Electrode with P−N Function for Photoelectrocatalytic Degradation of Organic Contaminants