<?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>0123-3033</journal-id>
<journal-title><![CDATA[Ingeniería y competitividad]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. compet.]]></abbrev-journal-title>
<issn>0123-3033</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad del Valle]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-30332021000200213</article-id>
<article-id pub-id-type="doi">10.25100/iyc.v23i2.10965</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Structural and optical properties of TiO2 nanoparticles and their photocatalytic behavior under visible light]]></article-title>
<article-title xml:lang="es"><![CDATA[Propiedades estructurales y ópticas de las nanopartículas de TiO2 y su comportamiento fotocatalítico bajo luz visible]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mosquera-Vargas]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Molina]]></surname>
<given-names><![CDATA[Daniela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Diosa]]></surname>
<given-names><![CDATA[Jesús E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad del Valle Facultad de Ciencias Naturales y Exactas Departamento de Física]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>23</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-30332021000200213&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-30332021000200213&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-30332021000200213&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract TiO2 nanoparticles were synthesized using a facile, reproducible, and scalable sol-gel method and their structural and optical properties was studied. XRD ad FTIR was used to identify the phase, crystallite size, and functional groups present in the nanoparticles. The prepared samples crystallize in the anatase structure with a highly crystalline order. TEM/EDX shows that the nanoparticles are pure, spherical, and with an average particle size of 15 ( 2 nm. The optical band gap energy is around 3.69 ± 0.10 eV and exhibits blueshift with respect to the bulk anatase. PL emission is attributed to oxygen vacancies (Vo). All samples were photoactive for MO degradation after 240 min of being irradiated with visible light.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Nanopartículas de TiO2 fueron sintetizadas utilizando un fácil, reproducible, y escalable método sol-gel y sus propiedades estructurales y ópticas estudiadas. Se usó XRD y FTIR para identificar la fase, el tamaño del cristalito y los grupos funcionales presentes en las nanopartículas. Las muestras preparadas cristalizan en la estructura anatasa con un orden altamente cristalino. TEM/EDX muestran que las nanopartículas son puras, esféricas y con un tamaño medio de partícula de 15 ± 2 nm. La energía de la banda prohibida óptica es de alrededor 3.69 ± 0.10 eV y presenta un desplazamiento hacia el azul con respecto a la anatasa en granel. La emisión de FL se atribuye a las vacantes de oxígeno (Vo). Todas las muestras fueron fotoactivas para la degradación de MO después de 240 min de ser irradiadas con luz visible.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Photocatalytic]]></kwd>
<kwd lng="en"><![CDATA[Sol-gel synthesis]]></kwd>
<kwd lng="en"><![CDATA[Structural and optical properties]]></kwd>
<kwd lng="en"><![CDATA[TiO2 nanoparticles]]></kwd>
<kwd lng="es"><![CDATA[Actividad fotocatalítica]]></kwd>
<kwd lng="es"><![CDATA[Nanopartículas de TiO2]]></kwd>
<kwd lng="es"><![CDATA[Propiedades estructurales y ópticas]]></kwd>
<kwd lng="es"><![CDATA[Síntesis sol-gel]]></kwd>
</kwd-group>
</article-meta>
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