Application of diamond electrodes to electrochemical processes

Panizza, Marco; Cerisola, G.

doi:10.1016/j.electacta.2005.04.023

Cited by 750 publications

(476 citation statements)

References 74 publications

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“…The utilization of anodes with high oxygen overpotential, e.g. BDD electrodes, enhances the compounds degradation and increases the current efficiency [8,9]. The use of BDD thin film electrodes in anodic oxidation has shown that O 2 overvoltage is much higher than for conventional anodes, such as PbO 2 , producing larger amounts of quasi-free OH radicals and other oxidants (depending on supporting electrolytes).…”

Section: Introductionmentioning

confidence: 99%

Application of BDD thin film electrode for electrochemical decomposition of heterogeneous aromatic compounds

et al. 2012

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Abstract:The aim of the presented study is to investigate the applicability of electrochemical oxidation of aromatic compounds containing heteroatoms, e.g. waste from production of pesticides or pharmaceutics, at a borondoped diamond (BDD) electrode. The BDD electrodes were synthesized by microwave plasma enhanced chemical vapour deposition (MW PE CVD). Investigation of the electrode surface by optical microscopy and scanning electron microscopy (SEM) confirmed that the synthesized layer was continuous and formed a densely packed grain structure with an average roughness of less than 0 5 µm. The influence of important electrochemical parameters: current density, kind of reactor, pH or mixing operation, on the efficiency of the oxidation was investigated. The fouling of electrode's surface caused by the deposition of organic material was observed during CV and galvanostatic experiments. At low current density the oxidation rate constant k was low, but the current efficiency was relatively high. The BDD can be used successfully to remove heterogeneous aromatic compounds existing either as molecules or cations. During 4 h of electrolysis 95% of aromatic compounds were electrochemically decomposed to mineral forms. It was observed that the influence of the initial pH on mineralization was marginal. PACS

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Section: Introductionmentioning

confidence: 99%

Application of BDD thin film electrode for electrochemical decomposition of heterogeneous aromatic compounds

et al. 2012

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“…In general, this fine-tuning has been carried out via thermal, chemical, or electrochemical treatment of electrodes. [6][7][8][9][10][11] Although many treatment methods for the fine-tuning of metal electrodes, [6][7][8][9][10][11] carbon-based electrodes, 12) and boron-doped diamond electrodes 13) have been developed, those of ITO electrodes have been far less studied. 14) In particular, there is no report for tuning the electrocatalytic activities of ITO electrodes via thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal Treatment on the Electrocatalytic Activities and Surface Roughness of ITO Electrodes

Choi¹,

Jo²,

Yang³

2012

Journal of Electrochemical Science and Technology

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:The electrocatalytic activities and surface roughness of indium-tin-oxide (ITO) electrodes have been investigated after thermal treatment at 100, 150, or 200 o C for 30 min, 2 h, or 8 h. To check electrocatalytic activities, the electrochemical behavior of four electroactive species ( p-hydroquinone, Ru(NH 3 ) 6 3+, ferrocenemethanol, and Fe(CN) 6 4-) has been measured. The electron transfer rate for p-hydroquinone oxidation and ferrocenemethanol oxidation increases with increasing the incubation temperature and the incubation period of time, but the rate for Ru(NH 3 ) 6 3+ is similar irrespective of the incubation temperature and period because Ru(NH 3 ) 6 3+ undergoes a fast outer-sphere reaction. Overall, the electrocatalytic activities of ITO electrodes increase with increasing the incubation temperature and period. The surface roughness of ITO electrodes increases with increasing the incubation temperature, and the thermal treatment generates many towering pillars as high as several tens of nanometer.

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“…• OH) denota o radical hidroxila na superfície do ânodo M. 13,14 A grande vantagem de se utilizar estes métodos para a degradação de poluentes orgânicos está na não seletividade dos radicais hidroxilas. Neste caso, moléculas orgânicas são desidrogenadas ou hidroxiladas até a completa mineralização (conversão em CO 2 , água e íons inorgânicos).…”

Section: Introductionunclassified

Degradação eletroquímica da vinhaça usando eletrodo de diamante dopado com boro

Batista¹,

Oliveira²,

Ferreira³

et al. 2011

Quím. Nova

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Mauro Coelho dos SantosUniversidade Federal do ABC, 09210-170 Santo André -SP, BrasilRecebido em 25/10/10; aceito em 22/4/11; publicado na web em 14/6/11 ELECTROCHEMICAL OXIDATION OF VINASSES USING A BORON DOPED DIAMOND ELECTRODE. The degradation of vinasses in aqueous solution from ethanol industry has been investigated by electrochemical oxidation using a boron doped diamond electrode (BDD). Samples of vinasses were electrolyzed in medium of (0.1 mol L -1 ) Na 2 SO 4 solutions at controlled potentials of +2.4, +3.0 and +4.0 V (vs. Ag/AgCl) and exhibited considerable reduction of total organic carbon. The cyclic voltammetry studies indicate that the vinasses are oxidized irreversibly over the BDD at 2.0 V (vs. Ag/AgCl) in diffusion controlled process. From the experimental results it is clear that the BDD electrode can be a valuable tool to the electrochemical degradation of vinasses in practical applications.Keywords: vinasses; electrochemical degradation; boron doped diamond electrode. INTRODUÇÃODiante da necessidade de minimizar os impactos causados por diversos poluentes orgânicos, há um grande interesse no desenvolvimento de métodos eficientes para degradação de diferentes classes de substâncias. Estes métodos visam reduzir ao máximo a complexidade química das moléculas, assim como os níveis de resíduos gerados. 1-23Dentre os poluentes que causam danos ao meio ambiente pode-se destacar a vinhaça, que é produzida em grande escala no Brasil devido à produção de etanol, setor que está em plena expansão, em virtude da necessidade da substituição de combustíveis fósseis pelos biocombustíveis.A vinhaça é caracterizada como um efluente de destilarias com alto poder poluente e alto valor fertilizante. É composta principalmente por ácido acético e lático, glicerol, açúcares, alta concentração de sais minerais e matéria orgânica. Geralmente é convertida em adubo, entretanto, quando descartada no meio ambiente causa graves problemas ambientais.4,5 Sua força poluente, cerca de cem vezes a do esgoto doméstico, decorre da sua riqueza em matéria orgânica, além de possuir três importantes componentes: nitrogênio, fósforo e potás-sio. A poluição dos cursos d'água é caracterizada pela introdução em sua massa líquida de qualquer elemento que lhe seja estranho. Mesmo que esse elemento se constitua de alguma riqueza, a água que o transporta estará poluída. Por muito tempo a vinhaça foi simplesmente descartada nos rios, poluindo-os consideravelmente. 6 Geralmente, efluentes provenientes de destilarias são tratados por meio de métodos biológicos (aeróbicos e anaeróbicos), ou por meio de tratamentos físico-químicos, como adsorção, coagulação e floculação, oxidação, tratamento utilizando membranas e evaporação/combustão. 7Os métodos eletroquímicos surgem como uma alternativa promissora para esses fins, pois permitem a transformação prévia de certos compostos orgânicos em substâncias biodegradáveis ou levam, eventualmente, à formação de CO 2 + H 2 O ("incineração eletroquími-ca"). A grande vantagem destes métodos é que o reagente p...

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Application of diamond electrodes to electrochemical processes

Cited by 750 publications

References 74 publications

Application of BDD thin film electrode for electrochemical decomposition of heterogeneous aromatic compounds

Application of BDD thin film electrode for electrochemical decomposition of heterogeneous aromatic compounds

Effect of Thermal Treatment on the Electrocatalytic Activities and Surface Roughness of ITO Electrodes

Degradação eletroquímica da vinhaça usando eletrodo de diamante dopado com boro

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