Electrochemical Treatment of Synthetic Wastewaters Containing Alphazurine A Dye: Role of Electrode Material in the Colour and COD Removal
The electrochemical oxidation of Alphazurine A (azA) has been studied in Na2SO4 media at Ti/IrO2, Pb/PbO2 and boron-doped diamond (Si/BDD) electrodes by bulk electrolysis experiments undergalvanostatic control at j = 30 and 60 mA cm-2. The obtained results have clearly shown that the electrode mater...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2008 |
| País: | México |
| Recursos: | Universidad de las Américas Puebla |
| Repositório: | Redalyc-UDLAP |
| OAI Identifier: | oai:redalyc.org:47512076004 |
| Acesso em linha: | https://www.redalyc.org/articulo.oa?id=47512076004 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Química dyes Anodic oxidation lead dioxide electrode iridium dioxide electrode boron doped diamond electrode |
| Resumo: | The electrochemical oxidation of Alphazurine A (azA) has been studied in Na2SO4 media at Ti/IrO2, Pb/PbO2 and boron-doped diamond (Si/BDD) electrodes by bulk electrolysis experiments undergalvanostatic control at j = 30 and 60 mA cm-2. The obtained results have clearly shown that the electrode material plays an important role for the electrochemical incineration of azA, where Pb/PbO2 and Si/ BDD lead complete mineralization of dye, while Ti/IrO2 disfavoured such process. The complete mineralization of ±zA on Pb/PbO2 and Si/BDD is due to the production of hydroxyl radicals on these materials surfaces. Current efficiencies obtained at Ti/IrO2, Pb/PbO2 and Si/ BDD gave values of 3, 24 and 42%, for each electrode material, at 30 mA cm-2, respectively. These values were higher than those obtained at 60 mA cm-2. Energy consumption values from the electrolyses performed at 30 mA cm-2 were 254, 124 and 51 kWh m-3, for Ti/IrO2, Pb/PbO2 and Si/BDD, respectively. UV spectrometric measurements showed faster azA elimination at the Si/BDD electrode than those obtained on Ti/IrO2 and Pb/PbO2. |
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