<?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>0124-8170</journal-id>
<journal-title><![CDATA[Ciencia e Ingeniería Neogranadina]]></journal-title>
<abbrev-journal-title><![CDATA[Cienc. Ing. Neogranad.]]></abbrev-journal-title>
<issn>0124-8170</issn>
<publisher>
<publisher-name><![CDATA[Universidad Militar Nueva Granada]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0124-81702018000200029</article-id>
<article-id pub-id-type="doi">10.18359/rcin.2669</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[EFECTO DE LA CONCENTRACIÓN DE HIERRO EN LAS PROPIEDADES DEL Nb2O5 CON POSIBLE APLICACIÓN FOTOCATALÍTICA]]></article-title>
<article-title xml:lang="en"><![CDATA[EFFECT OF THE CONCENTRATION OF IRON IN THE PROPERTIES OF Nb2O5 WITH POSSIBLE PHOTOCATALITIC APPLICATION]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Murillo Ruíz]]></surname>
<given-names><![CDATA[Edwin Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raba Páez]]></surname>
<given-names><![CDATA[Ángela Mercedes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rincón Joya]]></surname>
<given-names><![CDATA[Miryam]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Uni versidad Francisco de Paula Santander  ]]></institution>
<addr-line><![CDATA[Cúcuta ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Uni versidad Francisco de Paula Santander  ]]></institution>
<addr-line><![CDATA[Cúcuta ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>28</volume>
<numero>2</numero>
<fpage>29</fpage>
<lpage>43</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0124-81702018000200029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0124-81702018000200029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0124-81702018000200029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Actualmente, se busca desarrollar compuestos de energía de banda gap baja para ser aplicados en fotocatálisis. Se eligió dopar el pentóxido de niobio con hierro, con el fin de establecer la relación entre sus propiedades estructurales, superficiales y ópticas, y posibles aplicaciones fotocatalíticas. Se prepararon polvos de Nb2O5 dopados con Fe (al 2,5 %, 5 % y 10 %, porcentaje en peso) por el método Pechini, buscando establecer las condiciones de síntesis apropiadas para la conformación de partículas de Nb2O5:Fe. Los polvos fueron sinterizados a 600°C y 700°C por 2 h en aire y posteriormente fueron examinados por TGA, DRX, MEB, espectroscopia de reflectancia difusa UV-vis y por el método BET. En las muestras precalcinadas el análisis térmico permitió establecer el comportamiento del porcentaje de pérdida de peso en función de la temperatura. Se compararon los resultados obtenidos para el óxido no dopado, con los del Nb2O5 dopado con Fe para analizar sus propiedades cristalinas. Los difractogramas del Nb2O5 dopado con Fe al 2,5 % y 5 %, sometido a 700°C fueron similares al del Nb2O5 no dopado, indicando que el Nb fue sustituido por el Fe y, por lo tanto, no se presentan variaciones considerables en la estructura del óxido. El tamaño de cristalito de las partículas nanoestructuradas de Nb2O5 dopado con Fe, aumentó en todos los casos cuando la temperatura de sinterización se incrementó de 600°C a 700°C. La energía de banda gap del Nb2O5: Fe disminuyó con el incremento de la temperatura para las concentraciones de 2,5 % y 5 %. El valor del S  BET aumentó con el incremento de la concentración de hierro. La muestra Nb2O5:Fe5 %, calcinada a 700°C, presentó una E  g de aproximadamente 2,69 eV y características estructurales y superficiales que la hacen promisoria para pruebas de desempeño fotocatalítico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT At present, low band gap energy compounds are under development to be applied in photocatalysis. Niobium pentoxide was doped with iron to establish the relationship between its structural, surface and optical properties and its potential photocatalytic applications. Fe-doped Nb2O5 powders were prepared (at 2.5, 5 and 10 %, weight percent) using the Pechini method to create the appropriate synthesis conditions for the formation of Nb2O5:Fe particles. The powders were sintered at 600 and 700 °C for two hours in air and subsequently examined by TGA, XRD, SEM, UV-vis diffuse reflectance spectroscopy and the BET method. In pre-calcined samples, the thermal analysis allowed to establish the behavior of weight loss percentage dependent on temperature. Results obtained for non-doped oxide were compared with those of Fe-doped Nb2O5 to analyze its crystalline properties. The diffractograms of Fe-doped Nb2O5 at 2.5 and 5 %, subjected to 700 °C, were similar to those of non-doped Nb2O5. This suggests that Nb was replaced by Fe and, therefore, there are no significant variations in the oxide structure. The crystallite size of Fe-doped Nb2O5 nanostructured particles increased in all cases when the sintering temperature increased from 600 to 700 °C. The band gap energy of Nb2O5:Fe decreased with increased temperature for 2.5 and 5 % concentrations. The S  BET value increased with increased iron concentration. The 5 % Nb2O5:Fe sample, calcined at 700 °C, showed an E  g of approximately 2.69 eV and structural and superficial characteristics that make it promising for photocatalytic performance tests.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Nb2O5: Fe]]></kwd>
<kwd lng="es"><![CDATA[fotocatálisis]]></kwd>
<kwd lng="es"><![CDATA[método Pechini]]></kwd>
<kwd lng="es"><![CDATA[tratamiento térmico]]></kwd>
<kwd lng="es"><![CDATA[propiedades estructurales]]></kwd>
<kwd lng="en"><![CDATA[Nb2O5: Fe, Pechini method]]></kwd>
<kwd lng="en"><![CDATA[photocatalysis]]></kwd>
<kwd lng="en"><![CDATA[thermal treatment]]></kwd>
<kwd lng="en"><![CDATA[structural properties]]></kwd>
</kwd-group>
</article-meta>
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