<?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>S0120-62302024000300086</article-id>
<article-id pub-id-type="doi">10.17533/udea.redin.20240304</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Titania modifications with fluoride, sulfate, and platinum for photochemical reduction of chromium (VI)]]></article-title>
<article-title xml:lang="es"><![CDATA[Titania modificada con fluoruro, sulfatos y platino para la reducción fotoquímica de cromo (VI)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murcia]]></surname>
<given-names><![CDATA[Julie Joseane]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Laverde]]></surname>
<given-names><![CDATA[Mónica Sirley]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa-Camargo]]></surname>
<given-names><![CDATA[Ivan Alexander]]></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[Navío]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo-López]]></surname>
<given-names><![CDATA[Maria del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia UPTC Escuela de Ciencias Químicas Grupo de Catálisis]]></institution>
<addr-line><![CDATA[Tunja Boyacá]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Abierta y a Distancia UNAD Escuela de Ciencias Básicas Tecnología e Ingeniería Grupo GIA]]></institution>
<addr-line><![CDATA[Boyacá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Sevilla Instituto de Ciencia de Materiales de Sevilla (ICMS), ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2024</year>
</pub-date>
<numero>112</numero>
<fpage>86</fpage>
<lpage>97</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-62302024000300086&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-62302024000300086&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-62302024000300086&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In this work, Titania was modified by sulfation or fluorination and platinum on the surface to improve the Cr (VI) reduction efficiency compared to the bare TiO2 material synthesized by the sol-gel method. The synthesized materials were characterized by XRD, SBET, UV-Vis DRS, XRF, TEM, FTIR, and XPS. The modifications led to higher stability in the Anatase phase and surface area of this semiconductor. The addition of F and Pt in TiO2 led to absorption increases in the visible region of the electromagnetic spectrum. A correlation between the new physicochemical properties obtained after TiO2 modification and the photocatalytic performance of this material was observed. The best result in chromium reduction was obtained using Pt-S-TiO2 as the photocatalyst; this material showed a suitable combination of surface area, high UV-Vis absorption, high hydroxylation, and the existence of Pt nanoparticles on the surface, which favors an increased electron-hole pair half-life. Different reaction parameters were also evaluated, which demonstrated that the best photocatalytic performance was obtained under an N2 atmosphere, a light intensity of 120 W/m2, and 2 hours of total reaction time. Likewise, it was noted that an increase in reaction time from 2 to 5 hours, had a detrimental effect on reducing Cr (VI) efficiency.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En este trabajo, la Titania se modificó por sulfatación o fluorización y platino en superficie, con el objetivo de mejorar la eficiencia en la reducción de Cr (VI) en comparación con el material TiO2 base sintetizado por el método sol-gel. Los materiales fueron caracterizados por DRX, SBET, UV-Vis DRS, FRX, TEM, FTIR y XPS. Las modificaciones permitieron obtener una mayor estabilidad en la fase Anatasa y en el área superficial del semiconductor. La adición de F y Pt en el TiO2 provocaron aumentos de absorción en la región visible del espectro electromagnético. Se observó una correlación entre las nuevas propiedades fisicoquímicas obtenidas tras la modificación del TiO2 y el rendimiento fotocatalítico del material. El mejor resultado en la reducción de cromo se obtuvo utilizando Pt-S-TiO2 como fotocatalizador, este material mostró una combinación adecuada de área superficial, alta absorción UV-Vis, alta hidroxilación y la existencia de nanopartículas de Pt en la superficie que favorecen un aumento de la vida media del par electrón-hueco. También se evaluaron parámetros de reacción que demostraron que el mejor desempeño fotocatalítico se obtuvo bajo atmósfera de N2, intensidad de luz de 120 W/m2 y 2 horas de tiempo total de reacción. Así mismo, se observó que aumentar el tiempo de reacción de 2 a 5 horas tuvo un efecto perjudicial sobre la eficiencia en la reducción de Cr (VI).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[F-TiO2]]></kwd>
<kwd lng="en"><![CDATA[S-TiO2]]></kwd>
<kwd lng="en"><![CDATA[Pt-F-TiO2]]></kwd>
<kwd lng="en"><![CDATA[Pt-S-TiO2]]></kwd>
<kwd lng="en"><![CDATA[chromium, photoreduction]]></kwd>
<kwd lng="es"><![CDATA[F-TiO2]]></kwd>
<kwd lng="es"><![CDATA[S-TiO2]]></kwd>
<kwd lng="es"><![CDATA[Pt-F-TiO2]]></kwd>
<kwd lng="es"><![CDATA[Pt-S-TiO2]]></kwd>
<kwd lng="es"><![CDATA[Cromo, fotoreducción]]></kwd>
</kwd-group>
</article-meta>
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