<?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>0120-5609</journal-id>
<journal-title><![CDATA[Ingeniería e Investigación]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. Investig.]]></abbrev-journal-title>
<issn>0120-5609</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad Nacional de Colombia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56092020000300022</article-id>
<article-id pub-id-type="doi">10.15446/ing.investig.v40n3.83709</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Adsorption Thermodynamics of Cr(VI) Removal by Using Agro-Industrial Waste of Oil Palm Bagasse and Plantain Peels]]></article-title>
<article-title xml:lang="es"><![CDATA[Termodinámica de Adsorción en la Remoción de Cr(VI) usando Residuos Agroindustriales Bagazo de Palma Aceitera y Cáscaras de Plátano]]></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[Ortega-Toro]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Cartagena  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Cartagena  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Cartagena  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>40</volume>
<numero>3</numero>
<fpage>22</fpage>
<lpage>28</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56092020000300022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56092020000300022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56092020000300022&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The effect of temperature on the adsorption of Cr (VI) was determined with waste materials from the agro-industry, such as palm bagasse and plantain peels, by determining the thermodynamic parameters which allow to establish the mechanisms that control the process. The methodology included an initial preparation of the biomass, its characterization, and subsequent adsorption tests by setting the initial concentration of the metal to 100 ppm, a particle size of 0,5 mm, a biomass amount of 0,325 g, pH 2, and a volume of 100 mL. The process temperature varied between 303,15, and 352,15 K. The concentration of the remaining metal in the solution was performed using the diphenyl carbazide colorimetric method through a UV-Vis spectroscopy at a wavelength of 540 nm. The results show that the effect of temperature does not present a defined trend for palm bagasse, whereas it is linear for adsorption using plantain peels. Furthermore, the process of adsorption of Cr (VI) with palm bagasse is more favorable at higher temperatures, since it is a spontaneous process with a physical adsorption mechanism. On the other hand, the adsorption process with plantain peels is thermodynamically feasible at temperatures from 40 to 55 °C and not spontaneous at higher temperatures. Also, a physicochemical adsorption mechanism was evinced. It is concluded that the use of the studied materials is possible in the removal of the Cr (VI) ion in aqueous solutions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se determinó el efecto de la temperatura en la adsorción de Cr (VI) usando materiales de desecho de la agroindustria, tales como bagazo de palma y cáscaras de plátano, determinando los parámetros termodinámicos que permiten establecer los mecanismos que controlan el proceso. La metodología incluyó una preparación inicial de la biomasa, su caracterización y pruebas posteriores de adsorción fijando la concentración inicial del metal a 100 ppm, el tamaño de partícula a 0,5 mm, una cantidad de biomasa de 0,325 g, pH 2 y un volumen de 100 mL. La temperatura del proceso varió entre 303,15, y 352,15 K. La concentración del metal remanente en la solución se realizó usando el método colorimétrico del difenil carbazida por espectroscopia UV-Vis a una longitud de onda de 540 nm. Los resultados muestran que el efecto de la temperatura no presenta una tendencia definida para el bagazo de palma, mientras que es lineal para la adsorción usando cáscaras de plátano. Además, el proceso de adsorción de Cr (VI) con el bagazo de palma se vuelve más favorable a temperaturas más altas, siendo este un proceso espontaneo con un mecanismo de adsorción física. Por otro lado, el proceso de adsorción con cáscaras de plátano es termodinámicamente factible a temperaturas de 40 hasta 55 °C y no espontáneo a temperaturas superiores. También se hace evidente un mecanismo de adsorción fisicoquímico. Se concluye que es posible el uso de los materiales estudiados en la remoción del ion Cr (VI) en soluciones acuosas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[adsorption]]></kwd>
<kwd lng="en"><![CDATA[batch system]]></kwd>
<kwd lng="en"><![CDATA[bio-adsorbent]]></kwd>
<kwd lng="en"><![CDATA[heavy metal]]></kwd>
<kwd lng="en"><![CDATA[temperature]]></kwd>
<kwd lng="es"><![CDATA[adsorción]]></kwd>
<kwd lng="es"><![CDATA[sistema por lotes]]></kwd>
<kwd lng="es"><![CDATA[bioadsorbente]]></kwd>
<kwd lng="es"><![CDATA[metal pesado]]></kwd>
<kwd lng="es"><![CDATA[temperatura]]></kwd>
</kwd-group>
</article-meta>
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