Electrochemical oxidation of benzene on boron-doped diamond electrodes

Oliveira, Reinaldo Cunha de; Salazar‐Banda, Giancarlo R.; Santos, Mauro C.; Calegaro, Marcelo L.; Miwa, Douglas Waychi; Machado, Sérgio Antônio Spínola; Avaca, Luís Alberto

doi:10.1016/j.chemosphere.2006.09.024

Cited by 82 publications

(57 citation statements)

References 25 publications

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“…The electrode entire regeneration occurs in pure water after 12 h-exposure. We note that the loss of BDD-electrode activity during the benzene oxidation was not mentioned in [5]. For comparison, we give in Figure 2 similar potentiodynamic curves taken in another indifferent electrolyte, namely, 1 M KCl solution.…”

Section: Potentiodynamic Curvesmentioning

confidence: 88%

“…The benzene oxidation at boron-doped diamond in 0.5 M H 2 SO 4 solution was studied in [5]. It was shown by using high-performance liquid chromatography that a mixture of the benzene oxidation intermediates (hydroquinone, resorcinol, p-benzoquinone, catechol, and phenol) was formed in solution at the anode potential of 2.5 V (versus Ag/AgClelectrode).…”

Section: Introductionmentioning

confidence: 99%

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Benzene Oxidation on Boron-Doped Diamond Electrode: Electrochemical-Impedance Study of Adsorption Effects

Pleskov

Krotova

Елкин

et al. 2012

International Journal of Electrochemistry

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Benzene oxidation at a boron-doped diamond anode in 0.5 M K 2 SO 4 aqueous solution is studied by cyclic voltammetry and electrochemical impedance spectroscopy. It is shown by measurements of differential capacitance and anodic current that in the ideal-polarizability potential region benzene either is not adsorbed at the diamond electrode or the benzene adsorption does not affect its capacitance. At more positive potentials, the adsorption of some intermediate of the benzene oxidation occurs at the electrode. The intermediate partially blocks the electrode surface and lowers the anodic current. The very fact of the electrode surface blocking is reflected in the complex-plane presentation of the impedance-potential plots.

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Section: Potentiodynamic Curvesmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Benzene Oxidation on Boron-Doped Diamond Electrode: Electrochemical-Impedance Study of Adsorption Effects

Pleskov

Krotova

Елкин

et al. 2012

International Journal of Electrochemistry

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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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“…Along with its good chemical and electrochemical stability even in strong aggressive media and long service life, BDD is promising anode for incineration of aqueous organic pollutants. Indeed, this technique has proven its high efficiency in mineralizing many toxic and biorefractory compounds such as phenol (Iniesta et al, 2001), 4-chlorophenols (Rodrigo et al, 2001), 2-naphthol , 4-nitrophenol (Cañizares et al, 2004), 4,6-dinitro-o-cresol (Flox et al, 2005), benzene (Oliveira et al, 2007), benzoic acid (Montilla et al, 2002), carboxylic acids (formic, oxalic and maleic) (Cañizares et al, 2003), paracetamol , diuron (Polcaro et al, 2004), chloromethylphenoxy herbicides (Boye et al, 2006), Orange II (Chen and Chen, 2006), azoic dyes (Cañizares et al, 2006), and sulfur-containing compouds (homocysteine, glutathione, 2-mercapto ethanesulfonic acid and cephalexin) (Chailapakul et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical incineration of dimethyl phthalate by anodic oxidation with boron-doped diamond electrode

Hou

Zhao

et al. 2009

Journal of Environmental Sciences

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The anodic oxidation of aqueous solutions containing dimethyl phthalate (DMP) up to 125 mg/L with sodium sulfate (Na 2 SO 4 ) as supporting electrolyte within the pH range 2.0-10.0 was studied using a one-compartment batch reactor employing a boron-doped diamond (BDD) as anode. Electrolyses were carried out at constant current density (1.5-4.5 mA/cm 2 ). Complete mineralization was always achieved owing to the great concentration of hydroxyl radical ( . OH) generated at the BDD surface. The effects of pH, apparent current density and initial DMP concentration on the degradation rate of DMP, the specific charge required for its total mineralization and mineralization current efficiency were investigated systematically. The mineralization rate of DMP was found to be pH-independent and to increase with increasing applied current density. Results indicated that this electrochemical process was subjected, at least partially, to the mass transfer of organics onto the BDD surface. Kinetic analysis of the temporal change of DMP concentration during electrolysis determined by High Performance Liquid Chromatography (HPLC) revealed that DMP decay under all tested conditions followed a pseudo first-order reaction. Aromatic intermediates and generated carboxylic acids were identified by Gas ChromatographyMass Spectrometry (GC-MS) and a general pathway for the electrochemical incineration of DMP on BDD was proposed.

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Electrochemical oxidation of benzene on boron-doped diamond electrodes

Cited by 82 publications

References 25 publications

Benzene Oxidation on Boron-Doped Diamond Electrode: Electrochemical-Impedance Study of Adsorption Effects

Benzene Oxidation on Boron-Doped Diamond Electrode: Electrochemical-Impedance Study of Adsorption Effects

Degradação eletroquímica da vinhaça usando eletrodo de diamante dopado com boro

Electrochemical incineration of dimethyl phthalate by anodic oxidation with boron-doped diamond electrode

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