<?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>S1870-249X2010000300005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Degradation of 4-Chlorophenol by Gamma Radiation of 137Cs and X-rays]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Juárez]]></surname>
<given-names><![CDATA[Julio César]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Becerril]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cejudo-Álvarez]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Tecnológico de Toluca  ]]></institution>
<addr-line><![CDATA[Metepec Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Investigaciones Nucleares  ]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<volume>54</volume>
<numero>3</numero>
<fpage>157</fpage>
<lpage>159</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2010000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2010000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2010000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[This paper presents results of radiolytic degradation of 4-chlorophenol in the presence of TiO2, Al2O3, y SiO2, using different radiation sources than 60Co, which is so common in this type of experiment. The radiation sources used were X-rays with energy of 100 keV and radiation from 137Cs (662 keV). After irradiation with a dose of 50 cGy X-ray and TiO2 obtained a degradation of about 5%, no degradation was obtained with 137Cs source and other oxides. This may be due to the fact that X-rays have a linear energy transfer (LET) greater value, and in the case of TiO2 present a crystalline structure, whereas the other two oxides are amorphous. Both characteristics result in better formation of a reactive species that allows the degradation of the compound.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se presentan los resultados de la degradación de 4-clorofenol por catálisis inducida por radiación ionizante, en el experimento se utilizaron TiO2, Al2O3, y SiO2 como catalizadores y radiación gamma de 137Cs (662 keV) además de rayos X con energía de 100 keV. Después de la irradiación con una dosis de 50 cGy de rayos X en combinación con TiO2 se obtuvo una degradación de alrededor del 5%, sin embargo no se registró degradación empleando los otros óxidos y la radiación gamma de 137Cs, esto puede ser atribuido a que los rayos X presentan mayores niveles de transferencia lineal de energía mayores que la radiación gamma. Por otro lado, de los tres óxidos empleados, el TiO2 presenta una estructura cristalina, mientras que los otros son amorfos, estas dos características originan una mejor formación de especies reactivas que hacen posible la degradación del compuesto.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Radiocatalysis]]></kwd>
<kwd lng="en"><![CDATA[Photocatalysis]]></kwd>
<kwd lng="en"><![CDATA[Radiation Induced Catalysis]]></kwd>
<kwd lng="en"><![CDATA[4-Chlorophenol]]></kwd>
<kwd lng="es"><![CDATA[Radiocatálisis]]></kwd>
<kwd lng="es"><![CDATA[fotocatálisis]]></kwd>
<kwd lng="es"><![CDATA[catálisis inducida por radiación]]></kwd>
<kwd lng="es"><![CDATA[4-clorofenol]]></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>Degradation of 4&#150;Chlorophenol by Gamma Radiation of <sup>137</sup>Cs and X&#150;rays</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Julio C&eacute;sar Gonz&aacute;lez&#150;Ju&aacute;rez,<sup>1</sup> Jaime Jim&eacute;nez&#150;Becerril<sup>2*</sup>, and Jes&uacute;s Cejudo&#150;&Aacute;lvarez<sup>2</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> Instituto Tecnol&oacute;gico de Toluca, Av. Instituto Tecnol&oacute;gico Ex&#150;Rancho la Virgen, Metepec, Estado de M&eacute;xico, M&eacute;xico 52140.</i> <a href="mailto:cenuclear@hotmail.com">cenuclear@hotmail.com</a>.</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Instituto Nacional de Investigaciones Nucleares. Apartado Postal 18&#150;1027. M&eacute;xico, D.F. 11801 M&eacute;xico. (+52) 55 53297200 ext. 2266. <sup>*</sup>Responsible author:</i> <a href="mailto:jaimejimenez@iningob.mx">jaimejimenez@iningob.mx</a>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Received November 24, 2009    ]]></body>
<body><![CDATA[<br>   Accepted May 13, 2010</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">This paper presents results of radiolytic degradation of 4&#150;chlorophenol in the presence of TiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, y SiO<sub>2</sub>, using different radiation sources than <sup>60</sup>Co, which is so common in this type of experiment. The radiation sources used were X&#150;rays with energy of 100 keV and radiation from <sup>137</sup>Cs (662 keV). After irradiation with a dose of 50 cGy X&#150;ray and TiO<sub>2</sub> obtained a degradation of about 5%, no degradation was obtained with <sup>137</sup>Cs source and other oxides. This may be due to the fact that X&#150;rays have a linear energy transfer (LET) greater value, and in the case of TiO<sub>2</sub> present a crystalline structure, whereas the other two oxides are amorphous. Both characteristics result in better formation of a reactive species that allows the degradation of the compound.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Radiocatalysis, Photocatalysis, Radiation Induced Catalysis, 4&#150;Chlorophenol.</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 presentan los resultados de la degradaci&oacute;n de 4&#150;clorofenol por cat&aacute;lisis inducida por radiaci&oacute;n ionizante, en el experimento se utilizaron TiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, y SiO<sub>2</sub> como catalizadores y radiaci&oacute;n gamma de <sup>137</sup>Cs (662 keV) adem&aacute;s de rayos X con energ&iacute;a de 100 keV. Despu&eacute;s de la irradiaci&oacute;n con una dosis de 50 cGy de rayos X en combinaci&oacute;n con TiO<sub>2</sub> se obtuvo una degradaci&oacute;n de alrededor del 5%, sin embargo no se registr&oacute; degradaci&oacute;n empleando los otros &oacute;xidos y la radiaci&oacute;n gamma de <sup>137</sup>Cs, esto puede ser atribuido a que los rayos X presentan mayores niveles de transferencia lineal de energ&iacute;a mayores que la radiaci&oacute;n gamma. Por otro lado, de los tres &oacute;xidos empleados, el TiO<sub>2</sub> presenta una estructura cristalina, mientras que los otros son amorfos, estas dos caracter&iacute;sticas originan una mejor formaci&oacute;n de especies reactivas que hacen posible la degradaci&oacute;n del compuesto.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Radiocat&aacute;lisis, fotocat&aacute;lisis, cat&aacute;lisis inducida por radiaci&oacute;n, 4&#150;clorofenol.</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/v54n3/v54n3a5.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>Acknowledgments</b></font></p>     <p align="justify"><font face="verdana" size="2">Julio C&eacute;sar Gonz&aacute;lez thanks the Consejo Nacional de Ciencia y Tecnolog&iacute;a (CONACyT) M&eacute;xico for scholarship grant no. 181247.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Agrios, A. G.; Gray, K. A; Weitz, E. <i>Langmuir </i><b>2004</b>, <i>20, </i>5911&#150;5917.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4913317&pid=S1870-249X201000030000500001&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. Henderson, M. A.; Chambers, S. A.; Daschbach, J. L.; Herman, G. S.; Peden, C. H. F.; Perkins, C. L.; Su, Y.; Wang, Y.; Fryberger, T.; Janata, J. <i>Ionizing radiation induced catalysis on meta oxide particles. </i>U.S. Department of Energy, USA, <b>1999</b>.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4913319&pid=S1870-249X201000030000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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