<?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>0120-2804</journal-id>
<journal-title><![CDATA[Revista Colombiana de Química]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Quim.]]></abbrev-journal-title>
<issn>0120-2804</issn>
<publisher>
<publisher-name><![CDATA[Departamento de Química,  Universidad Nacional de Colombia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28042018000100027</article-id>
<article-id pub-id-type="doi">10.15446/rev.colomb.quim.v47n1.64561</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio de la adsorción de 4-nitrofenol desde solución acuosa sobre un carbón activado con heteroátomos nitrogenados en la superficie: aplicación del Modelo de Sips]]></article-title>
<article-title xml:lang="en"><![CDATA[Adsorption study of 4-nitrophenol from aqueous solution on activated carbon with nitrogen heteroatoms on its surface: application of the Sips Model]]></article-title>
<article-title xml:lang="pt"><![CDATA[Estudo da adsorção de 4-nitrofenol a partir de solução aquosa de carvão ativado com heteroátomos azotados na superfície: aplicação do Modelo de Sips]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carvajal-Bernal]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Giraldo]]></surname>
<given-names><![CDATA[Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Piraján]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Departamento de Química]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de los Andes Facultad de Ciencias Departamento de Química]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>47</volume>
<numero>1</numero>
<fpage>27</fpage>
<lpage>33</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28042018000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28042018000100027&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28042018000100027&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se evaluó la aminación de un carbón activado preoxidado con ácido nítrico en la adsorción de 4-nitrofenol. Se aplicó el modelo de Sips a la adsorción desde solución acuosa, utilizando Sigmoidal Logistic 3 Parameter del programa SigmaPlot 12. Los parámetros obtenidos se compararon con los calculados con el programa Statistica 7 para los modelos de Sips y Langmuir. Se encontró que la modificación realizada sobre el carbón activado incrementó la adsorción de 4-nitrofenol de 2,16 a 2,19 mmolg-1, aumentando, a su vez, la afinidad adsorbente-adsorbato. El parámetro para la energía característica del sistema determinado con el modelo de Langmuir toma un valor de 377,47 L mmol-1 al no considerar la heterogeneidad energética, mientras que a partir del modelo de Sips se presenta un valor de 8,32 (Lmmol-1)1/n. Adicionalmente, se encontró que en la ecuación matemática Sigmoidal Logistic 3 Parameter del programa SigmaPlot el valor de 1/x0 corresponde a la constante KLF del modelo Langmuir-Freundlich, mientras que el valor del parámetro Ks del modelo de Sips es igual a (1/x0)-b. Se concluye que la adsorción de 4-nitrofenol sobre el carbón activado se favorece por el incremento de grupos nitrogenados sobre su superficie.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The amination of a nitric acid pre oxidized activated carbon in the adsorption of 4-nitrophenol was evaluated. The Sips model application to the aqueous solution adsorption data, using Sigmoidal Logistic 3 Parameter formula, in the SigmaPlot 12 program was applied. The obtained parameters were compared with those calculated with Statistica 7 program for Sips and Langmuir models. It was found that the activated carbon increases the adsorption from 2.16 to 2.19 mmol g-1, showing good adsorbent-adsorbate affinity. The system's characteristic energy parameter calculated with the Langmuir model was 377.47 L mmol-1, when not considering energy heterogeneity, while from the Sips model was 8.32 (L.mmol-1)1/n. Additionally, it was found that in the mathematical equation Sigmoidal Logistic 3 Parameter of the SigmaPlot program, the 1/x0 value corresponds to the Langmuir-Freundlich model constant KLF, while the parameter value KS in the Sips model is equal to (1/x0)-b in this program. It was concluded that the 4-nitrophenol adsorption on activated carbon is favored by the presence of nitrogen groups on their activated carbon surface.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Foi avaliada a aminação de um carvão ativado preoxidado com ácido nítrico na adsorção do 4-nitrofenol. Foi aplicado o modelo de Sips à adsorção desde solução aquosa usando Logística Sigmoidal 3 do programa Sigmaplot 12. Os parâmetros obtidos foram comparados com os calculados com o programa Statistica 7, para os modelos de Sips e Langmuir. Foi encontrado que a modificação do carvão ativado incrementou a adsorção de 4-nitrofenol de 2,16 até 2,19 mmolg-1, acrescentando a afinidade adsorvente-adsorvato. O parâmetro para a energia característica do sistema calculado com o modelo Langmuir teve um valor de 377,47 Lmmol-1 porque não considerou a heterogeneidade energética, enquanto que no modelo de Sips este parâmetro teve um valor de 8,32 (Lmmol-1)1/n. Além disso, foi encontrado que na equação matemática Sigmoidal Logistic 3 Parameter do programa Sigmaplot 3 o valor de 1/x0 corresponde à constante KLF do modelo Langmuir-Freundlich, enquanto o valor do parâmetro KS do modelo de Sips é igual a (1/x0)-b. Conclui-se que a adsorção do 4-nitrofenol sobre carvão ativado é favorecida pela presença de grupos nitrogenado na superfície destes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Sips]]></kwd>
<kwd lng="es"><![CDATA[Langmuir]]></kwd>
<kwd lng="es"><![CDATA[carbón activado]]></kwd>
<kwd lng="es"><![CDATA[adsorción]]></kwd>
<kwd lng="es"><![CDATA[4-nitrofenol]]></kwd>
<kwd lng="es"><![CDATA[SigmaPlot]]></kwd>
<kwd lng="en"><![CDATA[Sips]]></kwd>
<kwd lng="en"><![CDATA[Langmuir]]></kwd>
<kwd lng="en"><![CDATA[Adsorption]]></kwd>
<kwd lng="en"><![CDATA[Activated carbon]]></kwd>
<kwd lng="en"><![CDATA[4-nitrophenol]]></kwd>
<kwd lng="en"><![CDATA[SigmaPlot]]></kwd>
<kwd lng="pt"><![CDATA[Sips]]></kwd>
<kwd lng="pt"><![CDATA[Langmuir]]></kwd>
<kwd lng="pt"><![CDATA[carvão ativado]]></kwd>
<kwd lng="pt"><![CDATA[adsorção]]></kwd>
<kwd lng="pt"><![CDATA[4-nitrofenol]]></kwd>
<kwd lng="pt"><![CDATA[SigmaPlot]]></kwd>
</kwd-group>
</article-meta>
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