<?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>0120-6230</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería Universidad de Antioquia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.fac.ing.univ. Antioquia]]></abbrev-journal-title>
<issn>0120-6230</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-62302017000200020</article-id>
<article-id pub-id-type="doi">10.17533/udea.redin.n83a03</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Study of the visible light activity of Pt and Au-TiO 2 photocatalysts in organic pollutants degradation]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio de la actividad de los fotocatalizadores Pt and Au-TiO 2 en la degradación de contaminantes orgánicos bajo luz visible]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cubillos-Lobo]]></surname>
<given-names><![CDATA[Jairo Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murcia-Mesa]]></surname>
<given-names><![CDATA[Julie Joseane]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guarín-Romero]]></surname>
<given-names><![CDATA[Jhonatan Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Sarmiento]]></surname>
<given-names><![CDATA[Hugo Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo-López]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Navío-Santos]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia Escuela de Ciencias Químicas Grupo de Catálisis]]></institution>
<addr-line><![CDATA[Tunja ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sevilla Consejo Superior de Investigaciones Científicas CSIC Instituto de Ciencia de Materiales de Sevilla (ICMS)]]></institution>
<addr-line><![CDATA[Sevilla ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<numero>83</numero>
<fpage>20</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-62302017000200020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-62302017000200020&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-62302017000200020&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Pt-TiO2 and Au-TiO2 photocatalysts were prepared by noble metal photodeposition on sulfated TiO2. It was observed that optical absorption, oxidation state and particle size of the metallic species (Pt or Au) play an important role in the TiO2 photocatalytic activity under visible-light irradiation. Photocatalytic activity of the bare TiO2 powder in the phenol and methyl orange degradation increased with the sulfation and metal addition. The highest degradation rate under UV-Visible and visible light irradiation was obtained on Pt-S-TiO2 photocatalyst; this is mainly due to the optical properties of TiO2 induced by platinization and also to the good distribution and low Pt particles size. It was also found that this catalyst has a good stability after two cycles of reaction in the phenol photodegradation under UV-Visible light irradiation. The Pt-S-TiO2 photocatalyst was also active under solar light and under the environmental conditions of the city of Tunja (Boyacá), Colombia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los fotocatalizadores Pt-TiO2 y Au-TiO2 se prepararon por fotodeposición del metal noble sobre el TiO2 sulfatado. Se encontró que las propiedades ópticas, el estado de oxidación y el tamaño de partícula de las especies metálicas (Pt o Au) juegan un papel fundamental en la actividad fotocatalítica del TiO2 bajo luz visible. La actividad fotocatalítica del TiO2 en la degradación de fenol y naranja de metilo aumentó significativamente a través de los tratamientos de sulfatación y metalización de este óxido. La más alta velocidad de degradación bajo luz UV-Visible y visible, se alcanzó usando el fotocatalizador Pt-S-TiO2; esto se debe principalmente a la modificación de las propiedades ópticas del TiO2 inducidas por la platinización, también a la buena distribución y al pequeño tamaño de las partículas de Pt. Se encontró, además, que este catalizador presenta una buena estabilidad después de dos ciclos de reacción en la degradación de fenol bajo luz UV-Visible. El fotocatalizador Pt-S-TiO2 fue activo también bajo luz solar directa y bajo las condiciones medioambientales de la ciudad de Tunja (Boyacá), Colombia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Pt-S-TiO2]]></kwd>
<kwd lng="en"><![CDATA[Au-S-TiO2]]></kwd>
<kwd lng="en"><![CDATA[UV-Visible]]></kwd>
<kwd lng="en"><![CDATA[visible light]]></kwd>
<kwd lng="en"><![CDATA[pollutants photodegradation]]></kwd>
<kwd lng="es"><![CDATA[Pt-S-TiO2]]></kwd>
<kwd lng="es"><![CDATA[Au-S-TiO2]]></kwd>
<kwd lng="es"><![CDATA[UV-Visible]]></kwd>
<kwd lng="es"><![CDATA[luz visible]]></kwd>
<kwd lng="es"><![CDATA[degradación de contaminantes]]></kwd>
</kwd-group>
</article-meta>
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