<?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>S1870-249X2007000200005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Kinetics of the Degradation of 1,4-Dioxane Using Persulfate]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Félix-Navarro]]></surname>
<given-names><![CDATA[Rosa María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lin-Ho]]></surname>
<given-names><![CDATA[Shui Wai]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrera-Díaz]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Sicairos]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Tecnológico de Tijuana Centro de Graduados e Investigación ]]></institution>
<addr-line><![CDATA[Tijuana Baja California]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2007</year>
</pub-date>
<volume>51</volume>
<numero>2</numero>
<fpage>67</fpage>
<lpage>71</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2007000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2007000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2007000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The kinetics of oxidation of 1,4-dioxane by persulfate ions in aqueous media was investigated at different temperature, oxidant concentration and pH. Experimental results indicated that 1,4-dioxane degradation follows a pseudo-first-order decay model. Under the experimental conditions the reaction has an activation energy of 21.0 kcal/mol. Temperature and persulfate concentration significantly accelerate the 1,4 dioxane degradation, however, increasing pH (over the range of 3-11) decreased the rate.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se investigo la cinética de oxidación de 1,4-dioxano con iones persulfato en medio acuoso a diferente temperatura, concentración del oxidante y pH. Los resultados experimentales indican que la degradación de 1,4-dioxano sigue una cinética de pseudo-primer-orden. La energía de activación de la reacción es de 21.0 kcal/mol bajo las condiciones experimentales. Tanto la temperatura como la concentración de persulfato aceleran significativamente la degradación de 1,4 dioxano, sin embargo, incrementando el pH (3-11) disminuye la velocidad.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[1,4-dioxane]]></kwd>
<kwd lng="en"><![CDATA[persulfate]]></kwd>
<kwd lng="en"><![CDATA[degradation]]></kwd>
<kwd lng="en"><![CDATA[kinetics]]></kwd>
<kwd lng="es"><![CDATA[1,4-dioxano]]></kwd>
<kwd lng="es"><![CDATA[persulfato]]></kwd>
<kwd lng="es"><![CDATA[degradación]]></kwd>
<kwd lng="es"><![CDATA[cinética]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Kinetics of the Degradation of 1,4&#45;Dioxane Using Persulfate</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Rosa Mar&iacute;a F&eacute;lix&#45;Navarro, Shui Wai Lin&#45;Ho, N. Barrera&#45;D&iacute;az and Sergio P&eacute;rez&#45;Sicairos</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Centro de Graduados e Investigaci&oacute;n, Instituto Tecnol&oacute;gico de Tijuana A.P. 1166, C.P. 22000, Tijuana, Baja California M&eacute;xico. Tel (664) 623 3772, Fax (664) 623 4043</i> e&#45;mail: <a href="mailto:rmfelix@tectijuana.mx">rmfelix@tectijuana.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido el 21 de julio de 2006    ]]></body>
<body><![CDATA[<br> 	Aceptado el 19 de enero de 2007</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 kinetics of oxidation of 1,4&#45;dioxane by persulfate ions in aqueous media was investigated at different temperature, oxidant concentration and pH. Experimental results indicated that 1,4&#45;dioxane degradation follows a pseudo&#45;first&#45;order decay model. Under the experimental conditions the reaction has an activation energy of 21.0 kcal/mol. Temperature and persulfate concentration significantly accelerate the 1,4 dioxane degradation, however, increasing pH (over the range of 3&#45;11) decreased the rate.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> 1,4&#45;dioxane, persulfate, degradation, kinetics.</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 investigo la cin&eacute;tica de oxidaci&oacute;n de 1,4&#45;dioxano con iones persulfato en medio acuoso a diferente temperatura, concentraci&oacute;n del oxidante y pH. Los resultados experimentales indican que la degradaci&oacute;n de 1,4&#45;dioxano sigue una cin&eacute;tica de pseudo&#45;primer&#45;orden. La energ&iacute;a de activaci&oacute;n de la reacci&oacute;n es de 21.0 kcal/mol bajo las condiciones experimentales. Tanto la temperatura como la concentraci&oacute;n de persulfato aceleran significativamente la degradaci&oacute;n de 1,4 dioxano, sin embargo, incrementando el pH (3&#45;11) disminuye la velocidad.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> 1,4&#45;dioxano, persulfato, degradaci&oacute;n, cin&eacute;tica.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v51n2/v51n2a5.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The authors thank Consejo Nacional de Ciencia y Tecnolog&iacute;a CONACYT of Mexico (SEP&#45;2004&#45;C01&#45;47959) for financial support for this investigation.</font></p> 	    <p align="justify">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1.&nbsp;Sandy, T.; Grady, C.P.; Meinninger, S.; Boe, R. <i>Annual Industrial Wastes Technical and Regulatory Conference Proceeding 7<sup>th</sup>.</i> Charleston, SC,USA , <b>2001,</b> 88&#45;44 pp.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4897941&pid=S1870-249X200700020000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2.&nbsp;Alnaizy, R.; Akgerman, A. <i>Adv. Environ. Res.</i> <b>2000,</b> 4, 233&#45;244.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4897943&pid=S1870-249X200700020000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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