<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2008000400004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Electrochemical Treatment of Synthetic Wastewaters Containing Alphazurine A Dye: Role of Electrode Material in the Colour and COD Removal]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nava]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz]]></surname>
<given-names><![CDATA[Marco A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Huitle]]></surname>
<given-names><![CDATA[Carlos A.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Iztapalapa Departamento de Química]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de las Américas-Puebla Departamento de Química y Biología ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,University of Milan  ]]></institution>
<addr-line><![CDATA[Milan ]]></addr-line>
<country>Italy</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>52</volume>
<numero>4</numero>
<fpage>249</fpage>
<lpage>255</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2008000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2008000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2008000400004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The electrochemical oxidation of Alphazurine A (&#945;zA) has been studied in Na2SO4 media at Ti/IrO2, Pb/PbO2 and boron-doped diamond (Si/BDD) electrodes by bulk electrolysis experiments under galvanostatic 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 &#945;zA elimination at the Si/BDD electrode than those obtained on Ti/IrO2 and Pb/PbO2.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se estudió la oxidación electroquímica del colorante Alfazurina A (&#945;zA) en medio acuoso de Na2SO4 con electrodos de Ti/IrO2, Pb/PbO2 y diamante dopado con boro (Si/BDD), a través de experimentos de electrólisis, en modo galvanostático a j = 30 y 60 mA cm-2 . Los resultados obtenidos en este trabajo mostraron que el material del electrodo desempeña un papel importante para la incineración electroquímica del colorante azA, indicando que los electrodos de Pb/PbO2 y Si/BDD permiten la completa degradación del colorante, mientras que el electrodo de Ti/IrO2 desfavorece tal proceso. La completa degradación del colorante &#945;zA en los electrodos de Pb/PbO2 y Si/BDD fue debida a la formación de radicales hidroxilo en la superficie de estos materiales. Los valores de las eficiencias de corriente fueron de 3, 24 y 42%, para Ti/IrO2, Pb/PbO2 y Si/BDD, respectivamente, a j = 30 mA cm-2. . Estos valores fueron mayores que los obtenidos a 60 mA cm-2. Por otro lado, el consumo de energía a j = 30 mA cm-2 presentó valores de 254, 124 and 51 kWh m-3 para los electrodos de Ti/IrO2, Pb/PbO2 y Si/BDD, respectivamente. La cinética de eliminación de color empleando el electrodo de Si/BDD fue mayor que la obtenida con los electrodos de Ti/IrO2 y Pb/PbO2.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Anodic oxidation]]></kwd>
<kwd lng="en"><![CDATA[dyes]]></kwd>
<kwd lng="en"><![CDATA[boron doped diamond electrode]]></kwd>
<kwd lng="en"><![CDATA[iridium dioxide electrode]]></kwd>
<kwd lng="en"><![CDATA[lead dioxide electrode]]></kwd>
<kwd lng="es"><![CDATA[Oxidación anódica]]></kwd>
<kwd lng="es"><![CDATA[colorantes]]></kwd>
<kwd lng="es"><![CDATA[electrodos de diamante dopados con boro]]></kwd>
<kwd lng="es"><![CDATA[electrodo de dióxido de iridio]]></kwd>
<kwd lng="es"><![CDATA[electrodo de dióxido de plomo]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Article</font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Electrochemical Treatment of Synthetic Wastewaters Containing Alphazurine A Dye: Role of Electrode Material in the Colour and COD Removal</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Jos&eacute; L. Nava,<sup>1*</sup> Marco A. Quiroz,<sup>2</sup> and Carlos A. Mart&iacute;nez&#150;Huitle<sup>3*</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1 </sup>Departamento de Qu&iacute;mica, Universidad Aut&oacute;noma Metropolitana&#150;Iztapalapa. Av. San Rafael Atlixco 186, Vicentina, 09340, M&eacute;xico, D.F., M&eacute;xico. <sup>*</sup>Responsible author:</i>  <a href="mailto:jlnm@xanum.uam.mx">jlnm@xanum.uam.mx</a>.</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Departamento de Qu&iacute;mica y Biolog&iacute;a, Universidad de las Am&eacute;ricas&#150;Puebla. Sta. Catarina M&aacute;rtir, Cholula 72820, Puebla, M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>3</sup> University of Milan, DiSTAM, Laboratory of Electrochemistry, via Celoria 2, 20133, Milan, Italy., <sup>*</sup>Responsible author:</i> <a href="mailto:carlos.martinez@unimi.it">carlos.martinez@unimi.it</a>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received July 4, 2008    <br> Accepted November 25, 2008</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">The electrochemical oxidation of Alphazurine A (&#945;zA) has been studied in Na<sub>2</sub>SO<sub>4</sub> media at Ti/IrO<sub>2</sub>, Pb/PbO<sub>2</sub> and boron&#150;doped diamond (Si/BDD) electrodes by bulk electrolysis experiments under galvanostatic control at <i>j </i>= 30 and 60 mA cm<sup>&#150;2</sup>. The obtained results have clearly shown that the electrode material plays an important role for the electrochemical incineration of azA, where Pb/PbO<sub>2</sub> and Si/ BDD lead complete mineralization of dye, while Ti/IrO<sub>2</sub> disfavoured such process. The complete mineralization of &plusmn;zA on Pb/PbO<sub>2</sub> and Si/BDD is due to the production of hydroxyl radicals on these materials surfaces. Current efficiencies obtained at Ti/IrO<sub>2</sub>, Pb/PbO<sub>2</sub> and Si/ BDD gave values of 3, 24 and 42%, for each electrode material, at 30 mA cm<sup>&#150;2</sup>, respectively. These values were higher than those obtained at 60 mA cm<sup>&#150;2</sup>. Energy consumption values from the electrolyses performed at 30 mA cm<sup>&#150;2</sup> were 254, 124 and 51 kWh m<sup>&#150;3</sup>, for Ti/IrO<sub>2</sub>, Pb/PbO<sub>2</sub> and Si/BDD, respectively. UV spectrometric measurements showed faster &#945;zA elimination at the Si/BDD electrode than those obtained on Ti/IrO<sub>2</sub> and Pb/PbO<sub>2</sub>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Anodic oxidation, dyes, boron doped diamond electrode, iridium dioxide electrode, lead dioxide electrode.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Se estudi&oacute; la oxidaci&oacute;n electroqu&iacute;mica del colorante Alfazurina A (&#945;zA) en medio acuoso de Na<sub>2</sub>SO<sub>4</sub> con electrodos de Ti/IrO<sub>2</sub>, Pb/PbO<sub>2</sub> y diamante dopado con boro (Si/BDD), a trav&eacute;s de experimentos de electr&oacute;lisis, en modo galvanost&aacute;tico a <i>j </i>= 30 y 60 mA cm<sup>&#150;2</sup> . Los resultados obtenidos en este trabajo mostraron que el material del electrodo desempe&ntilde;a un papel importante para la incineraci&oacute;n electroqu&iacute;mica del colorante azA, indicando que los electrodos de Pb/PbO<sub>2</sub> y Si/BDD permiten la completa degradaci&oacute;n del colorante, mientras que el electrodo de Ti/IrO<sub>2</sub> desfavorece tal proceso. La completa degradaci&oacute;n del colorante &#945;zA en los electrodos de Pb/PbO<sub>2</sub> y Si/BDD fue debida a la formaci&oacute;n de radicales hidroxilo en la superficie de estos materiales. Los valores de las eficiencias de corriente fueron de 3, 24 y 42%, para Ti/IrO2, Pb/PbO2 y Si/BDD, respectivamente, a <i>j </i>= 30 mA cm<sup>&#150;2</sup>. . Estos valores fueron mayores que los obtenidos a 60 mA cm<sup>&#150;2</sup>. Por otro lado, el consumo de energ&iacute;a a <i>j </i>= 30 mA cm<sup>&#150;2</sup> present&oacute; valores de 254, 124 and 51 kWh m<sup>&#150;3</sup> para los electrodos de Ti/IrO<sub>2</sub>, Pb/PbO<sub>2</sub> y Si/BDD, respectivamente. La cin&eacute;tica de eliminaci&oacute;n de color empleando el electrodo de Si/BDD fue mayor que la obtenida con los electrodos de Ti/IrO<sub>2</sub> y Pb/PbO<sub>2</sub>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Oxidaci&oacute;n an&oacute;dica, colorantes, electrodos de diamante dopados con boro, electrodo de di&oacute;xido de iridio, electrodo de di&oacute;xido de plomo.</font></p>     ]]></body>
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