<?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>2007-9753</journal-id>
<journal-title><![CDATA[RIIIT. Revista internacional de investigación e innovación tecnológica]]></journal-title>
<abbrev-journal-title><![CDATA[RIIIT. Rev. int. investig. innov. tecnol.]]></abbrev-journal-title>
<issn>2007-9753</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Coahuila]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-97532020000100002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Síntesis de partículas mesoporosas de TiO2 y estudio cinético de la fotodegradación de azul de metileno]]></article-title>
<article-title xml:lang="en"><![CDATA[Synthesis of TiO2 mesoporous particles and kinetic study of the methylene blue photodegradation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estrada-Flores]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Luévanos]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Cerda]]></surname>
<given-names><![CDATA[L.A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Berumen]]></surname>
<given-names><![CDATA[C.M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Guia]]></surname>
<given-names><![CDATA[T.E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilera-González]]></surname>
<given-names><![CDATA[E.N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Coahuila Facultad de Ciencias Químicas Departamento de Materiales Cerámicos Avanzados y Energía]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación en Química Aplicada Departamento de Materiales Avanzados ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Coahuila Facultad de Ciencias Químicas Departamento de Química Orgánica]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de Coahuila Facultad de Ciencias Químicas Departamento de Materiales Avanzados]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2020</year>
</pub-date>
<volume>7</volume>
<numero>42</numero>
<fpage>22</fpage>
<lpage>34</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-97532020000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-97532020000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-97532020000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Actualmente, el óxido de titanio (TiO2) es utilizado en procesos de fotocatálisis para el tratamiento de aguas residuales, sin embargo, las propiedades ópticas y texturales de este material aún pueden ser mejoradas para hacer más eficiente el proceso de fotocatálisis. Por esta razón, en el presente trabajo se realizó la síntesis de partículas de TiO2, fase anatasa, mediante sol-gel asistido con el uso de un surfactante; se determinaron las condiciones de pH y concentración de catalizador adecuadas para la fotodecoloración eficiente del colorante azul de metileno. Los resultados muestran que las partículas de TiO2 sintetizado corresponde a una anatasa con superficie hidroxilada, con un área superficial específica de 90.37 m2/g y con presencia de mesoporos. El valor de brecha de energía prohibida fue de 2.88 eV, el cual es menor al del óxido de titanio comercial P25. Los resultados de las pruebas de fotodecoloración del colorante azul de metileno, bajo luz UV, indican que las condiciones óptimas son 2 g/L de fotocatalizador y un pH de 8, logrando hasta un 100 % de fotodecoloración del colorante en 30 minutos. El proceso de fotodecoloración de azul de metileno con TiO2 es de primer orden, a todas las condiciones de pH y concentración de catalizador utilizadas. El porcentaje de fotodecoloración de azul de metileno con 45 minutos de irradiación con luz UV (100 %) es mayor que el porcentaje de decoloración obtenido con luz visible (57 %).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Nowadays, titanium oxide (TiO2) is commonly used in photocatalysis process for wastewater treatment, however, the optical and textural properties of this material can be yet improved in order to make more efficient the photocatalysis. For that reason, in this work the synthesis of TiO2 was made by a sol-gel method assisted with the use of a surfactant; also, the conditions for the photodecoloration of methylene blue, such as pH and concentration of the photocatalyst were investigated. The results show that the product corresponds to an anatase sample with hydroxylated surface, this sample has a specific surface area of 90.37 m2/g and presents mesoporosity. The band gap of the material was 2.88 eV, which is lower than the commercial TiO2 P25. The photodecoloration tests under UV light indicate that the best conditions for the photocatalysis process using the TiO2 sample are a concentration of 2 g/L and a pH of 8, with a 100 % of dye degradation in 30 minutes. The kinetics of methylene blue photodecoloration was of first order for all pH values and catalyst concentrations used. The percentage of photodecoloration of methylene blue at 45 minutes of irradiation with UV light (100 %) is greater than the percentage of discoloration obtained with visible light (57 %).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[azul de metileno]]></kwd>
<kwd lng="es"><![CDATA[cinética]]></kwd>
<kwd lng="es"><![CDATA[fotocatalizador]]></kwd>
<kwd lng="es"><![CDATA[mesoporos]]></kwd>
<kwd lng="es"><![CDATA[óxido de titanio]]></kwd>
<kwd lng="en"><![CDATA[kinetic]]></kwd>
<kwd lng="en"><![CDATA[methylene blue]]></kwd>
<kwd lng="en"><![CDATA[mesopores]]></kwd>
<kwd lng="en"><![CDATA[photocatalyst]]></kwd>
<kwd lng="en"><![CDATA[titanium oxide]]></kwd>
</kwd-group>
</article-meta>
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