<?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>2448-5691</journal-id>
<journal-title><![CDATA[Mundo nano. Revista interdisciplinaria en nanociencias y nanotecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Mundo nano]]></abbrev-journal-title>
<issn>2448-5691</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias Aplicadas y Tecnología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2448-56912025000100004</article-id>
<article-id pub-id-type="doi">10.22201/ceiich.24485691e.2025.34.69834</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Remoción de metales pesados en agua empleando bioadsorbentes magnéticos]]></article-title>
<article-title xml:lang="en"><![CDATA[Heavy metal removal in water using magnetic bioadsorbents]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerra Hernández]]></surname>
<given-names><![CDATA[Julia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinoza Jarrin]]></surname>
<given-names><![CDATA[Johana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Simón Bolívar Departamento de Termodinámica y Fenómenos de Transferencia ]]></institution>
<addr-line><![CDATA[Sartenejas Baruta]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2025</year>
</pub-date>
<volume>18</volume>
<numero>34</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2448-56912025000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2448-56912025000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2448-56912025000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En este trabajo se realizó la síntesis, caracterización y aplicación de un bioadsorbente de pectina-magnetita con propiedades magnéticas para remover metales pesados en soluciones acuosas. Se utilizaron hojas de Aloe vera como fuente de pectina y se incorporaron nanopartículas de magnetita a través del método de coprecipitación; el material se caracterizó mediante las técnicas de FTIR, DRX y MEB. Se estimó la capacidad máxima de adsorción para los iones plomo (II) y cromo (VI) a través de isotermas de adsorción; se obtuvieron 36.442    m g  P b  g y 2.254    m g  C r  g, lo cual indica una mayor afinidad por parte del bioadsorbente hacia el plomo (II). Se evaluó la remoción de plomo (II) en un adsorbedor empacado con lecho fresco y reutilizado en presencia de un campo magnético externo; se obtuvieron capacidades de adsorción de 9.6    m g  P b  g y 5.3    m g  P b  g, respectivamente. Las propiedades magnéticas del material permitieron modificar los esquemas evaluados para proponer nuevos arreglos y comparar su eficiencia en términos de capacidad de adsorción y dimensiones. Los esquemas más eficientes fueron la columna empacada y el tubo recubierto (WCOT); en este último, se dispuso el adsorbente de forma anular sobre una pared recubierta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: In this study, synthesis, characterization, and application of a pectin-magnetite bioadsorbent with magnetic properties for heavy metal removal in aqueous solutions were carried out. Pectin was obtained from Aloe vera leaves whereas magnetite nanoparticles were incorporated through coprecipitation method. The material was characterized via FTIR, XRD, and SEM techniques. The maximum adsorption capacity for lead (II) and chromium (VI) ions was estimated through adsorption isotherms, resulting in 36.442    m g  P b  g and 2.254    m g  C r  g. This indicates a higher affinity from the bioadsorbent toward Lead (II). The removal of Lead (II) was also evaluated in a packed bed adsorber, both with fresh bed, and reused bed under an external magnetic field; adsorption capacities of 9.6    m g  P b  g and 5.3    m g  P b  g were obtained, respectively. The magnetic properties of the material allowed for modifications in the evaluated schemes, proposing new arrangements and comparing their efficiency in terms of adsorption capacity and dimensions. The most efficient schemes were the packed column and the coated tube (WCOT), where the adsorbent was annularly disposed on a coated wall.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[magnetic bioadsorption]]></kwd>
<kwd lng="en"><![CDATA[heavy metals]]></kwd>
<kwd lng="en"><![CDATA[adsorption isotherms]]></kwd>
<kwd lng="en"><![CDATA[breakthrough curves]]></kwd>
<kwd lng="es"><![CDATA[bioadsorción magnética]]></kwd>
<kwd lng="es"><![CDATA[metales pesados]]></kwd>
<kwd lng="es"><![CDATA[isotermas de adsorción]]></kwd>
<kwd lng="es"><![CDATA[curvas de ruptura]]></kwd>
</kwd-group>
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