Anodic oxidation with doped diamond electrodes: a new advanced oxidation process

Kraft, Alexander; Stadelmann, Manuela; Blaschke, M.

doi:10.1016/j.jhazmat.2003.07.006

Cited by 156 publications

(69 citation statements)

References 33 publications

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“…3 BDD anodes allow the direct production of hydroxyl radicals (OH • ) from electrolysis of water with very high current efficiencies as shown by its dominant degradation mechanism in phenol oxidation 18 (Equation (1)). Hydroxyl radicals also play a major role in the degredation of dye molecules.…”

Section: -37mentioning

confidence: 99%

Electrochemical oxidation of Basic Blue 3 dye using a diamond anode: evaluation of colour, COD and toxicity removal

Yavuz

Koparal

Öğütveren

2010

J. Chem. Technol. Biotechnol.

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BACKGROUND: Textile industries generate considerable amounts of waste-water, which may contain strong colour, suspended particles, salts, high pH and high chemical oxygen demand (COD) concentration. The disposal of these coloured wastewaters poses a major problem for the industry as well as a threat to the environment. In this study, electrochemical oxidation of Basic Blue 3 (BB3) dye was studied in a bipolar trickle tower (BTT) reactor using Raschig ring shaped boron-doped diamond (BDD) electrodes in recirculated batch mode. The effects of current density, temperature, flow rate, sodium sulfate concentration (Na 2 SO 4 ) as supporting electrolyte, and initial dye concentration were investigated.

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Section: -37mentioning

confidence: 99%

Electrochemical oxidation of Basic Blue 3 dye using a diamond anode: evaluation of colour, COD and toxicity removal

Yavuz

Koparal

Öğütveren

2010

J. Chem. Technol. Biotechnol.

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“…These include the possibility that oxidizing agents (e.g., hydroxyl radicals, active chlorine) are electrochemically produced at the anode without the need, in many cases, to add further reagents. 14,15 Additionally, the unselective nature of the produced oxidizing agents makes the method applicable for a large range of pollutants.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical degradation of the dye reactive orange 16 using electrochemical flow-cell

Gomes¹,

Miwa²,

Malpass³

et al. 2011

J. Braz. Chem. Soc.

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As remoções eletroquímicas de cor e do conteúdo orgânico de soluções do corante laranja reativo 16 (RO16) foram efetuadas usando uma célula em fluxo e um eletrodo de trabalho de Pt. As influências das variáveis do sistema, tais como fluxo, concentração de NaCl, potencial aplicado e pH da solução, foram estudadas. A melhor remoção de cor foi de 93% (l = 493 nm) após 60 min de eletrólise potentiostática a 2,2 V vs. ERH, usando 1,00 g L -1 NaCl como eletrólito suporte. Os aumentos na concentração de NaCl e do potencial aumentam a velocidade de remoção de cor. A melhor remoção de carbono orgânico total (57%) foi obtida com a aplicação de 1,8 V, sem membrana de separação, indicando que as melhores condições para remoção de cor não são necessariamente as melhores para remover conteúdo orgânico. A eficiência de degradação diminui com a diminuição do pH da solução.Electrochemical removals of color and organic load from solutions containing the dye reactive orange 16 (RO16) were performed in an electrochemical flow-cell, using a platinum working electrode. The influence of the process variables flow-rate, such as NaCl concentration, applied potential and solution pH, were studied. The best color removal achieved was 93% (l = 493 nm) after 60 min at 2.2 V vs. RHE electrolysis, using 1.00 g L -1 NaCl as supporting electrolyte. The rises in the concentration of NaCl and applied potential increased the color removal rate. The best total organic carbon removal (57%) was obtained at 1.8 V, without the separating membrane, indicating that the ideal conditions for the color removal are not necessarily the same as those to remove the total organic carbon. The degradation efficiency decreased with the solution pH decrease.Keywords: decolorization, textile effluent, electrochemical degradation, reactive dye, Pt electrode IntroductionWhen untreated textile effluents are discharged into receiving water bodies many environmental problems can occur. The principal problems are that the presence of dyes (even at concentrations of < 1 ppm) that can cause considerable coloration in water courses, affect transparency to natural light (reducing photosynthesis), reduce gas solubility and may also present carcinogenic and mutagenic properties. 1,2Wide varieties of dyes are used in the textile industry and can be classified according to the manner in which they are fixed to the textile fiber (e.g., direct, reactive) or by their chemical structure (e.g., azo, anthraquinone). In the textile industry, reactive dyes are widely used due to their relatively easy application in the dyeing process and stability during wear. As a result of this stability, reactive dyes may require more complicated systems to achieve their removal from effluent flows. A number of methods presented in the literature are traditionally used to treat textile effluent and they are generally based on physical, chemical and biological treatments.3-5 Physical treatment methods tend to simply transfer the pollutant to a different phase and biological methods can be prolonged and ...

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“…In fact, compared to classical carbon materials and other metallic electrodes, BDD electrodes differ by their excellent chemical inertness and chemical stability that enable their use in extreme chemical environments such as strongly acidic media. These electrodes are relatively insensitive to oxygen evolution and present an enhanced electrochemical window in aqueous media and organic solvent making them promising materials for the fabrication of stable electrodes for the treatment of industrial wastes [4,5] or water purification [6]. In addition to its wide electrochemical window, BDD electrodes present low noise to signal and background to signal ratios making them attractive materials for electroanalytical applications.…”

Section: Introductionmentioning

confidence: 99%

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

et al. 2005

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Boron doped diamond (BDD) films are promising materials for electroanalysis and bioelectroanalysis. This contribution gives a short review on BDD functionalization by chemical and biochemical entities and on the applications of BDD electrodes to electroanalysis of chemical compounds of biological interest. This review is illustrated by the developments on BDD interfaces in both these areas carried out in our group. BDD electrodes were prepared by means of microwave plasma-assisted CVD onto silicon substrate giving rise to H-terminated BDD films. Anodic polarization of BDD electrodes in aqueous media generates hydrophilic oxidized surfaces and extended electrochemical window in aqueous media. We took advantage of this enlarged electrochemical window together with the hydroxylated surface for the functionalization of BDD electrode surfaces with biomolecules and for bioelectroanalysis. We have designed a novel route of BDD functionalization using OH terminations of the anodized surface. The modification of the BDD surface with biotin groups will be presented here as biologically active model. Furthermore, as the anodic potential window of BDD increases upon electrochemical activation, 2'-deoxyguanosine (1.2 V vs. Ag/AgCl) and 2'-deoxyadenosine (1.5 V vs. Ag/AgCl) could be detected electrochemically with an acceptable signal to noise ratio. The electrochemical signature of each oxidizable base was assessed using differential pulse voltammetry (DPV). These experiments pointed towards adsorption of the oxidized products, which were investigated macroscopically by DPV and at the microscopic level by SECM (scanning electrochemical microscopy).

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Anodic oxidation with doped diamond electrodes: a new advanced oxidation process

Cited by 156 publications

References 33 publications

Electrochemical oxidation of Basic Blue 3 dye using a diamond anode: evaluation of colour, COD and toxicity removal

Electrochemical oxidation of Basic Blue 3 dye using a diamond anode: evaluation of colour, COD and toxicity removal

Electrochemical degradation of the dye reactive orange 16 using electrochemical flow-cell

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

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