<?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>S0120-28042018000200054</article-id>
<article-id pub-id-type="doi">10.15446/rev.colomb.quim.v47n2.68213</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Adsorción de acetaminofén sobre carbones activados a diferente pH. Entalpía y entropía del proceso]]></article-title>
<article-title xml:lang="en"><![CDATA[Acetaminophen adsorption on activated carbons at different pH. Change of enthalpy and entropy of the process]]></article-title>
<article-title xml:lang="pt"><![CDATA[Adsorção de acetaminofeno em carvões ativados a diferentes pH. Entalpia e entropia do processo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bernal]]></surname>
<given-names><![CDATA[Valentina]]></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 Departamento de Química ]]></institution>
<addr-line><![CDATA[Bogotá D. C]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de los Andes Departamento de Química ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>47</volume>
<numero>2</numero>
<fpage>54</fpage>
<lpage>62</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28042018000200054&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28042018000200054&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28042018000200054&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se analizaron los cambios entálpicos y entrópicos derivados del proceso de adsorción de acetaminofén sobre carbones activados con química superficial modificada. Se realizó, además, una variación del pH para determinar los cambios en las propiedades termodinámicas cuando existen cargas en el adsorbato y en el adsorbente. Se encontró que la máxima capacidad de adsorción (1,172 mmoles g-1) corresponde al proceso llevado a cabo en el carbón activado denominado CAR en este estudio a pH 7; los valores de las funciones termodinámicas de entalpía de inmersión y entropía de adsorción fueron -36,02 J g-1 y 0,123 J g-1 K-1, respectivamente. Así, el cambio de entropía de adsorción para el acetaminofén en los carbones activados estudiados dependió del pH. Se encontró que esta función termodinámica varía en el siguiente orden pH 2 &gt; pH 11 &gt; pH 7. Este comportamiento se relaciona con el número de especies presentes en la solución capaces de interactuar con la superficie del carbón activado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The enthalpic and entropic changes resulting from the process of acetaminophen adsorption on activated carbons with modified surface chemistry were studied. A pH variation was performed to determine the changes in the thermodynamic properties when there are charges in the adsorbate and adsorbent. It was found that the maximum adsorption capacity (1.172 mmoles g-1) corresponds to the process carried out in the activated charcoal labeled as CAR in this study at pH 7; the values of the thermodynamic functions immersion enthalpy and entropy of adsorption were -36.02 J g-1 and 0.123 J g-1 K-1, respectively. Thus, the adsorption entropy change for the acetaminophen on the activated carbons depended on the pH. It was found that this thermodynamic function varies in the following order pH 2 &gt; pH 11 &gt; pH 7. This behavior is related to the number of species present in the solution capable of interact with the activated carbon surface.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Foram analisadas as mudanças entrópicas e entalpicas resultantes do processo de adsorção de acetaminofeno sobre carvões activados com superfície química modificada. Além disso, foi realizada uma variação do pH para determinar as alterações nas propriedades termodinâmicas quando existem cargas no adsorbato e no adsorvente. Foi encontrado que a máxima capacidade de adsorção (1.172 mmol g-1) corresponde ao processo realizado no carvão ativado chamado CAR neste estudo em pH 7; os valores das funções termodinâmicas de entalpia de imersão e entropia de adsorção foram -36,02 J g-1 e 0,123 J g-1 K-1 respectivamente. As mudança da entropia de adsorção para o acetaminofeno nos carvões activados dependeu do pH. Foi encontrado que esta função termodinâmica varia na seguinte ordem pH 2 &gt; pH 11 &gt; pH 7. Este comportamento está relacionado ao número de espécies presentes na solução capaz de interagir com a superfície de carvão activado.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Acetaminophen]]></kwd>
<kwd lng="es"><![CDATA[adsorption]]></kwd>
<kwd lng="es"><![CDATA[entropy change]]></kwd>
<kwd lng="es"><![CDATA[activated carbon]]></kwd>
<kwd lng="es"><![CDATA[immersion enthalpy]]></kwd>
<kwd lng="es"><![CDATA[hydrophobic interactions]]></kwd>
<kwd lng="en"><![CDATA[acetaminofén]]></kwd>
<kwd lng="en"><![CDATA[adsorción]]></kwd>
<kwd lng="en"><![CDATA[cambio de entropía]]></kwd>
<kwd lng="en"><![CDATA[carbón activado]]></kwd>
<kwd lng="en"><![CDATA[entalpía de interacción]]></kwd>
<kwd lng="en"><![CDATA[interacciones hidrofóbicas]]></kwd>
<kwd lng="pt"><![CDATA[acetaminofeno]]></kwd>
<kwd lng="pt"><![CDATA[adsorção]]></kwd>
<kwd lng="pt"><![CDATA[mudança de entropia]]></kwd>
<kwd lng="pt"><![CDATA[carvão ativado]]></kwd>
<kwd lng="pt"><![CDATA[entalpia de imersão]]></kwd>
<kwd lng="pt"><![CDATA[interações hidrofóbicas]]></kwd>
</kwd-group>
</article-meta>
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