<?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>0121-7488</journal-id>
<journal-title><![CDATA[Ciencia en Desarrollo]]></journal-title>
<abbrev-journal-title><![CDATA[Ciencia en Desarrollo]]></abbrev-journal-title>
<issn>0121-7488</issn>
<publisher>
<publisher-name><![CDATA[Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-74882024000100212</article-id>
<article-id pub-id-type="doi">10.19053/01217488.v15.n1.2024.15494</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Equilibrium and thermodynamics of Chromium (VI) adsorption on inert biomasses of Dioscorea rotundata and Elaeis guineensis]]></article-title>
<article-title xml:lang="es"><![CDATA[Equilibrio y termodinámica de adsorción de Cromo (VI) sobre biomasas inertes de Dioscorea rotundata y Elaeis guineensis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villabona-Ortíz]]></surname>
<given-names><![CDATA[Angel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tejada-Tovar]]></surname>
<given-names><![CDATA[Candelaria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gonzalez-Delgado]]></surname>
<given-names><![CDATA[Angel Dario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Negrete-Palacio]]></surname>
<given-names><![CDATA[Andres]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopez-Genes]]></surname>
<given-names><![CDATA[Jose]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Cartagena  ]]></institution>
<addr-line><![CDATA[Cartagena Bolivar]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Cartagena  ]]></institution>
<addr-line><![CDATA[Cartagena Bolivar]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2024</year>
</pub-date>
<volume>15</volume>
<numero>1</numero>
<fpage>212</fpage>
<lpage>220</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-74882024000100212&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-74882024000100212&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-74882024000100212&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Adsorption equilibrium on bioadsorbents was studied, and fitted to Langmuir, Freundlich and Dubinin-Radushkevich isothermal models, using yam peels (YP) and oil palm wastes (OPW) as bioadsorbents in the removal of hexavalent chromium present in aqueous solution, in a batch system, evaluating the effect of temperature, adsorbent dose and particle size on the process. Thermodynamic parameters were estimated by the Van't Hoff graphical method. It was found that the highest adsorption capacity was obtained at 0.03 g of adsorbent, 55 °C and 0.5 mm of particle size. The equilibrium of adsorption on OPW is described by Langmuir and Freundlich isotherms, while that of YP by Dubinin- Radushkevich's model, indicating the adsorption is given by the ion exchange between the active centers and the metallic ion. The thermodynamic study determined that the elimination of YP is endothermic, irreversible, and not spontaneous and that for OPW it is exothermic, spontaneous at low temperatures, and irreversible.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El equilibrio de adsorción en bioadsorbentes fue estudiado y ajustado a los modelos de isoterma de Langmuir, Freundlich y Dubinin-Radushkevich, usando cascaras de name (YP) y residuos de palma de acete (OPW) como bioadsorbentes en la remoción de cromo hexavalente presente en soluciones acuosas en sistema por lotes, evaluando el efecto de la temperatura, dosis de adsorbente y tamaño de partícula sobre el proceso. Los parâmetros termodinámicos fueron estimados mediante el método gráfico de Van't Hoff. Se encontro que la maxima capacidad de adsorción se obtuvo al usar 0.03 g de adsorbente, 55 °C y 0.5 mm de tamaño de partícula. El equilibrio de adsorción sobre OPW fue descrito por las isotermas de Langmuir y Freundlich, mientras que sobre YP por el modelo de Dubinin-Radushkevich, indicando que la adsorción se da por intercambio iónico entre los centros activos y el ion metálico. El estudio termodinámico estimo que la eliminación sobre YP es endotérmico, irreversible y no espontaneó, y el proceso sobre OPW es exotérmico, espontaneó a baja temperatura e irreversible.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[bioadsorption]]></kwd>
<kwd lng="en"><![CDATA[Langmuir]]></kwd>
<kwd lng="en"><![CDATA[Freundlich]]></kwd>
<kwd lng="en"><![CDATA[Dubinin-radushkevich]]></kwd>
<kwd lng="es"><![CDATA[bioadsorción]]></kwd>
<kwd lng="es"><![CDATA[Langmuir]]></kwd>
<kwd lng="es"><![CDATA[Freundlich]]></kwd>
<kwd lng="es"><![CDATA[Dubinin-Radushkevich]]></kwd>
</kwd-group>
</article-meta>
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